edit icon next to the message showing if the message was edited and what was there a first

Reviewed-on: blue/squawk#46

CHANGELOG.md

@@ -6,10 +6,14 @@
 - requesting the history of the current chat after reconnection
 - global availability (in drop down list) gets restored after reconnection
 - status icon in active chat changes when presence of the pen pal changes
+- infinite progress when open the dialogue with something that has no history to show
 
 ### Improvements
 - slightly reduced the traffic on the startup by not requesting history of all MUCs
-
+- completely rewritten message feed, now it works way faster
+- OPTIONAL RUNTIME dependency: "KIO Widgets" that is supposed to allow you to open a file in your default file manager
+- show in folder now is supposed to try it's best to show file in folder, even you don't have KIO installed
+- once uploaded local files don't get second time uploaded - the remote URL is reused
 
 ## Squawk 0.1.5 (Jul 29, 2020)
 ### Bug fixes

CMakeLists.txt

@@ -1,117 +1,106 @@
-cmake_minimum_required(VERSION 3.0)
-project(squawk)
+cmake_minimum_required(VERSION 3.4)
+project(squawk VERSION 0.1.6 LANGUAGES CXX)
 
-set(CMAKE_INCLUDE_CURRENT_DIR ON)
-set(CMAKE_CXX_STANDARD 14)
+cmake_policy(SET CMP0076 NEW)
+cmake_policy(SET CMP0079 NEW)
+set(CMAKE_CXX_STANDARD 17)
 
 set(CMAKE_AUTOMOC ON)
 set(CMAKE_AUTOUIC ON)
 set(CMAKE_AUTORCC ON)
 
 include(GNUInstallDirs)
-include_directories(.)
+set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake")
 
-find_package(Qt5Widgets CONFIG REQUIRED)
-find_package(Qt5LinguistTools)
+add_executable(squawk)
+target_include_directories(squawk PRIVATE ${CMAKE_SOURCE_DIR})
 
-if(NOT CMAKE_BUILD_TYPE)
+option(SYSTEM_QXMPP "Use system qxmpp lib" ON)
+option(WITH_KWALLET "Build KWallet support module" ON)
+option(WITH_KIO "Build KIO support module" ON)
+
+# Dependencies
+## Qt
+find_package(Qt5 COMPONENTS Widgets DBus Gui Xml Network Core REQUIRED)
+
+## QXmpp
+if (SYSTEM_QXMPP)
+  find_package(QXmpp CONFIG)
+
+  if (NOT QXmpp_FOUND)
+    set(SYSTEM_QXMPP OFF)
+    message("QXmpp package wasn't found, trying to build with bundled QXmpp")
+  else ()
+    message("Building with system QXmpp")
+  endif ()
+endif ()
+
+if (NOT SYSTEM_QXMPP)
+  target_link_libraries(squawk PRIVATE qxmpp)
+  add_subdirectory(external/qxmpp)
+else ()
+  target_link_libraries(squawk PRIVATE QXmpp::QXmpp)
+endif ()
+
+## KIO
+if (WITH_KIO)
+  find_package(KF5KIO CONFIG)
+
+  if (NOT KF5KIO_FOUND)
+    set(WITH_KIO OFF)
+    message("KIO package wasn't found, KIO support modules wouldn't be built")
+  else ()
+    target_compile_definitions(squawk PRIVATE WITH_KIO)
+    message("Building with support of KIO")
+  endif ()
+endif ()
+
+## KWallet
+if (WITH_KWALLET)
+  find_package(KF5Wallet CONFIG)
+
+  if (NOT KF5Wallet_FOUND)
+    set(WITH_KWALLET OFF)
+    message("KWallet package wasn't found, KWallet support module wouldn't be built")
+  else ()
+    target_compile_definitions(squawk PRIVATE WITH_KWALLET)
+    message("Building with support of KWallet")
+  endif ()
+endif ()
+
+## Signal (TODO)
+# find_package(Signal REQUIRED)
+
+## LMDB
+find_package(LMDB REQUIRED)
+
+# Linking
+target_link_libraries(squawk PRIVATE Qt5::Core Qt5::Widgets Qt5::DBus Qt5::Network Qt5::Gui Qt5::Xml)
+target_link_libraries(squawk PRIVATE lmdb)
+target_link_libraries(squawk PRIVATE simpleCrypt)
+target_link_libraries(squawk PRIVATE uuid)
+
+# Build type
+if (NOT CMAKE_BUILD_TYPE)
   set(CMAKE_BUILD_TYPE Debug)
-endif()
+endif ()
 
-set(CMAKE_CXX_FLAGS_DEBUG "-g -Wall -Wextra")
-set(CMAKE_CXX_FLAGS_RELEASE "-O3")
 message("Build type: ${CMAKE_BUILD_TYPE}")
 
+target_compile_options(squawk PRIVATE
+  "-Wall;-Wextra"
+  "$<$<CONFIG:DEBUG>:-g>"
+  "$<$<CONFIG:RELEASE>:-O3>"
+  )
 
-set(squawk_SRC
-  main.cpp
-  exception.cpp
-  signalcatcher.cpp
-  shared/global.cpp
-  shared/utils.cpp
-  shared/message.cpp
-  shared/vcard.cpp
-  shared/icons.cpp
-)
-
-set(squawk_HEAD
-  exception.h
-  signalcatcher.h
-  shared.h
-  shared/enums.h
-  shared/message.h
-  shared/global.h
-  shared/utils.h
-  shared/vcard.h
-  shared/icons.h
-)
-
-configure_file(resources/images/logo.svg squawk.svg COPYONLY)
-execute_process(COMMAND convert -background none -size 48x48 squawk.svg squawk48.png WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
-execute_process(COMMAND convert -background none -size 64x64 squawk.svg squawk64.png WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
-execute_process(COMMAND convert -background none -size 128x128 squawk.svg squawk128.png WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
-execute_process(COMMAND convert -background none -size 256x256 squawk.svg squawk256.png WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
-
-configure_file(packaging/squawk.desktop squawk.desktop COPYONLY)
-
-set(TS_FILES 
-    translations/squawk.ru.ts
-)
-qt5_add_translation(QM_FILES ${TS_FILES})
-add_custom_target(translations ALL DEPENDS ${QM_FILES})
-
-qt5_add_resources(RCC resources/resources.qrc)
-
-option(SYSTEM_QXMPP "Use system qxmpp lib" ON) 
-option(WITH_KWALLET "Build KWallet support module" ON) 
-
-if (SYSTEM_QXMPP) 
-    find_package(QXmpp CONFIG)
-    
-    if (NOT QXmpp_FOUND)
-        set(SYSTEM_QXMPP OFF)
-        message("QXmpp package wasn't found, trying to build with bundled QXmpp")
-    else()
-        message("Building with system QXmpp")
-    endif()
-endif()
-
-if(NOT SYSTEM_QXMPP)
-    add_subdirectory(external/qxmpp)
-endif()
-
-if (WITH_KWALLET)
-    find_package(KF5Wallet CONFIG)
-    
-    if (NOT KF5Wallet_FOUND)
-        set(WITH_KWALLET OFF)
-        message("KWallet package wasn't found, KWallet support module wouldn't be built")
-    else()
-        add_definitions(-DWITH_KWALLET)
-        message("Building with support of KWallet")
-    endif()
-endif()
-
-add_executable(squawk ${squawk_SRC} ${squawk_HEAD} ${RCC})
-target_link_libraries(squawk Qt5::Widgets)
-
-add_subdirectory(ui)
 add_subdirectory(core)
-
 add_subdirectory(external/simpleCrypt)
-
-target_link_libraries(squawk squawkUI)
-target_link_libraries(squawk squawkCORE)
-target_link_libraries(squawk uuid)
-
-add_dependencies(${CMAKE_PROJECT_NAME} translations)
+add_subdirectory(packaging)
+add_subdirectory(plugins)
+add_subdirectory(resources)
+add_subdirectory(shared)
+add_subdirectory(translations)
+add_subdirectory(ui)
 
 # Install the executable
 install(TARGETS squawk DESTINATION ${CMAKE_INSTALL_BINDIR})
-install(FILES ${QM_FILES} DESTINATION ${CMAKE_INSTALL_DATADIR}/squawk/l10n)
-install(FILES ${CMAKE_CURRENT_BINARY_DIR}/squawk.svg DESTINATION ${CMAKE_INSTALL_DATADIR}/icons/hicolor/scalable/apps)
-install(FILES ${CMAKE_CURRENT_BINARY_DIR}/squawk48.png DESTINATION ${CMAKE_INSTALL_DATADIR}/icons/hicolor/48x48/apps RENAME squawk.png)
-install(FILES ${CMAKE_CURRENT_BINARY_DIR}/squawk64.png DESTINATION ${CMAKE_INSTALL_DATADIR}/icons/hicolor/64x64/apps RENAME squawk.png)
-install(FILES ${CMAKE_CURRENT_BINARY_DIR}/squawk128.png DESTINATION ${CMAKE_INSTALL_DATADIR}/icons/hicolor/128x128/apps RENAME squawk.png)
-install(FILES ${CMAKE_CURRENT_BINARY_DIR}/squawk256.png DESTINATION ${CMAKE_INSTALL_DATADIR}/icons/hicolor/256x256/apps RENAME squawk.png)
-install(FILES ${CMAKE_CURRENT_BINARY_DIR}/squawk.desktop DESTINATION ${CMAKE_INSTALL_DATADIR}/applications)

README.md

@@ -13,7 +13,8 @@
 - lmdb
 - CMake 3.0 or higher
 - qxmpp 1.1.0 or higher
-- kwallet (optional)
+- KDE Frameworks: kwallet (optional)
+- KDE Frameworks: KIO (optional)
 
 ### Getting
 
@@ -67,6 +68,7 @@ Here is the list of keys you can pass to configuration phase of `cmake ..`.
 - `CMAKE_BUILD_TYPE` - `Debug` just builds showing all warnings, `Release` builds with no warnings and applies optimizations (default is `Debug`)
 - `SYSTEM_QXMPP` - `True` tries to link against `qxmpp` installed in the system, `False` builds bundled `qxmpp` library (default is `True`)
 - `WITH_KWALLET` - `True` builds the `KWallet` capability module if `KWallet` is installed and if not goes to `False`. `False` disables `KWallet` support (default is `True`)
+- `WITH_KIO` - `True` builds the `KIO` capability module if `KIO` is installed and if not goes to `False`. `False` disables `KIO` support (default is `True`)
 
 ## License
 

cmake/FindLMDB.cmake

@@ -0,0 +1,47 @@
+#This file is taken from here https://gitlab.ralph.or.at/causal-rt/causal-cpp/, it was GPLv3 license
+#Thank you so much, mr. Ralph Alexander Bariz, I hope you don't mind me using your code
+
+# Try to find LMDB headers and library.
+#
+# Usage of this module as follows:
+#
+#     find_package(LMDB)
+#
+# Variables used by this module, they can change the default behaviour and need
+# to be set before calling find_package:
+#
+#  LMDB_ROOT_DIR          Set this variable to the root installation of
+#                            LMDB if the module has problems finding the
+#                            proper installation path.
+#
+# Variables defined by this module:
+#
+#  LMDB_FOUND               System has LMDB library/headers.
+#  LMDB_LIBRARIES           The LMDB library.
+#  LMDB_INCLUDE_DIRS        The location of LMDB headers.
+
+find_path(LMDB_ROOT_DIR
+  NAMES include/lmdb.h
+  )
+
+find_library(LMDB_LIBRARIES
+  NAMES lmdb
+  HINTS ${LMDB_ROOT_DIR}/lib
+  )
+
+find_path(LMDB_INCLUDE_DIRS
+  NAMES lmdb.h
+  HINTS ${LMDB_ROOT_DIR}/include
+  )
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(LMDB DEFAULT_MSG
+  LMDB_LIBRARIES
+  LMDB_INCLUDE_DIRS
+  )
+
+mark_as_advanced(
+  LMDB_ROOT_DIR
+  LMDB_LIBRARIES
+  LMDB_INCLUDE_DIRS
+)

cmake/FindSignal.cmake

@@ -0,0 +1,15 @@
+find_path(Signal_INCLUDE_DIR NAMES signal/signal_protocol.h)
+find_library(Signal_LIBRARY signal-protocol-c)
+mark_as_advanced(Signal_INCLUDE_DIR Signal_LIBRARY)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(Signal REQUIRED_VARS Signal_LIBRARY Signal_INCLUDE_DIR)
+
+if (Signal_FOUND AND NOT TARGET Signal::Signal)
+  add_library(Signal::Signal UNKNOWN IMPORTED)
+  set_target_properties(Signal::Signal PROPERTIES
+    IMPORTED_LINK_INTERFACE_LANGUAGES "C"
+    IMPORTED_LOCATION "${Signal_LIBRARY}"
+    INTERFACE_INCLUDE_DIRECTORIES "${Signal_INCLUDE_DIR}"
+    )
+endif ()

core/CMakeLists.txt

@@ -1,46 +1,27 @@
-cmake_minimum_required(VERSION 3.0)
-project(squawkCORE)
-
-set(CMAKE_AUTOMOC ON)
-
-find_package(Qt5Core CONFIG REQUIRED)
-find_package(Qt5Gui CONFIG REQUIRED)
-find_package(Qt5Network CONFIG REQUIRED)
-find_package(Qt5Xml CONFIG REQUIRED)
-
-set(squawkCORE_SRC
-    squawk.cpp
-    account.cpp
-    archive.cpp
-    rosteritem.cpp
-    contact.cpp
-    conference.cpp
-    storage.cpp
-    networkaccess.cpp
-    adapterFuctions.cpp
-    handlers/messagehandler.cpp
-    handlers/rosterhandler.cpp
-)
+target_sources(squawk PRIVATE
+  account.cpp
+  account.h
+  adapterFuctions.cpp
+  archive.cpp
+  archive.h
+  conference.cpp
+  conference.h
+  contact.cpp
+  contact.h
+  main.cpp
+  networkaccess.cpp
+  networkaccess.h
+  rosteritem.cpp
+  rosteritem.h
+  signalcatcher.cpp
+  signalcatcher.h
+  squawk.cpp
+  squawk.h
+  storage.cpp
+  storage.h
+  urlstorage.cpp
+  urlstorage.h
+  )
 
+add_subdirectory(handlers)
 add_subdirectory(passwordStorageEngines)
-
-# Tell CMake to create the helloworld executable
-add_library(squawkCORE ${squawkCORE_SRC})
-
-
-if(SYSTEM_QXMPP)
-    get_target_property(QXMPP_INTERFACE_INCLUDE_DIRECTORIES QXmpp::QXmpp INTERFACE_INCLUDE_DIRECTORIES)
-    target_include_directories(squawkCORE PUBLIC ${QXMPP_INTERFACE_INCLUDE_DIRECTORIES})
-endif()
-
-# Use the Widgets module from Qt 5.
-target_link_libraries(squawkCORE Qt5::Core)
-target_link_libraries(squawkCORE Qt5::Network)
-target_link_libraries(squawkCORE Qt5::Gui)
-target_link_libraries(squawkCORE Qt5::Xml)
-target_link_libraries(squawkCORE qxmpp)
-target_link_libraries(squawkCORE lmdb)
-target_link_libraries(squawkCORE simpleCrypt)
-if (WITH_KWALLET)
-    target_link_libraries(squawkCORE kwalletPSE)
-endif()

core/account.cpp

@@ -84,8 +84,9 @@ Account::Account(const QString& p_login, const QString& p_server, const QString&
     QObject::connect(dm, &QXmppDiscoveryManager::itemsReceived, this, &Account::onDiscoveryItemsReceived);
     QObject::connect(dm, &QXmppDiscoveryManager::infoReceived, this, &Account::onDiscoveryInfoReceived);
     
-    QObject::connect(network, &NetworkAccess::uploadFileComplete, mh, &MessageHandler::onFileUploaded);
-    QObject::connect(network, &NetworkAccess::uploadFileError, mh, &MessageHandler::onFileUploadError);
+    QObject::connect(network, &NetworkAccess::uploadFileComplete, mh, &MessageHandler::onUploadFileComplete);
+    QObject::connect(network, &NetworkAccess::downloadFileComplete, mh, &MessageHandler::onDownloadFileComplete);
+    QObject::connect(network, &NetworkAccess::loadFileError, mh, &MessageHandler::onLoadFileError);
     
     client.addExtension(rcpm);
     QObject::connect(rcpm, &QXmppMessageReceiptManager::messageDelivered, mh, &MessageHandler::onReceiptReceived);
@@ -155,8 +156,9 @@ Account::~Account()
         reconnectTimer->stop();
     }
     
-    QObject::disconnect(network, &NetworkAccess::uploadFileComplete, mh, &MessageHandler::onFileUploaded);
-    QObject::disconnect(network, &NetworkAccess::uploadFileError, mh, &MessageHandler::onFileUploadError);
+    QObject::disconnect(network, &NetworkAccess::uploadFileComplete, mh, &MessageHandler::onUploadFileComplete);
+    QObject::disconnect(network, &NetworkAccess::downloadFileComplete, mh, &MessageHandler::onDownloadFileComplete);
+    QObject::disconnect(network, &NetworkAccess::loadFileError, mh, &MessageHandler::onLoadFileError);
     
     delete mh;
     delete rh;
@@ -402,9 +404,6 @@ QString Core::Account::getFullJid() const {
 void Core::Account::sendMessage(const Shared::Message& data) {
     mh->sendMessage(data);}
 
-void Core::Account::sendMessage(const Shared::Message& data, const QString& path) {
-    mh->sendMessage(data, path);}
-
 void Core::Account::onMamMessageReceived(const QString& queryId, const QXmppMessage& msg)
 {
     if (msg.id().size() > 0 && (msg.body().size() > 0 || msg.outOfBandUrl().size() > 0)) {
@@ -434,13 +433,13 @@ void Core::Account::requestArchive(const QString& jid, int count, const QString&
     
     if (contact == 0) {
         qDebug() << "An attempt to request archive for" << jid << "in account" << name << ", but the contact with such id wasn't found, skipping";
-        emit responseArchive(jid, std::list<Shared::Message>());
+        emit responseArchive(jid, std::list<Shared::Message>(), true);
         return;
     }
     
     if (state != Shared::ConnectionState::connected) {
         qDebug() << "An attempt to request archive for" << jid << "in account" << name << ", but the account is not online, skipping";
-        emit responseArchive(contact->jid, std::list<Shared::Message>());
+        emit responseArchive(contact->jid, std::list<Shared::Message>(), false);
     }
     
     contact->requestHistory(count, before);
@@ -552,9 +551,11 @@ void Core::Account::onClientError(QXmppClient::Error err)
                 case QXmppStanza::Error::NotAuthorized:
                     errorText = "Authentication error";
                     break;
+#if (QXMPP_VERSION) < QT_VERSION_CHECK(1, 3, 0)
                 case QXmppStanza::Error::PaymentRequired:
                     errorText = "Payment is required";
                     break;
+#endif
                 case QXmppStanza::Error::RecipientUnavailable:
                     errorText = "Recipient is unavailable";
                     break;
@@ -909,3 +910,19 @@ void Core::Account::handleDisconnection()
     ownVCardRequestInProgress = false;
 }
 
+void Core::Account::onContactHistoryResponse(const std::list<Shared::Message>& list, bool last)
+{
+    RosterItem* contact = static_cast<RosterItem*>(sender());
+    
+    qDebug() << "Collected history for contact " << contact->jid << list.size() << "elements";
+    if (last) {
+        qDebug() << "The response contains the first accounted message";
+    }
+    emit responseArchive(contact->jid, list, last);
+}
+
+void Core::Account::requestChangeMessage(const QString& jid, const QString& messageId, const QMap<QString, QVariant>& data){
+    mh->requestChangeMessage(jid, messageId, data);}
+
+void Core::Account::resendMessage(const QString& jid, const QString& id) {
+    mh->resendMessage(jid, id);}

core/account.h

@@ -43,7 +43,7 @@
 #include <QXmppVCardManager.h>
 #include <QXmppMessageReceiptManager.h>
 
-#include "shared.h"
+#include "shared/shared.h"
 #include "contact.h"
 #include "conference.h"
 #include "networkaccess.h"
@@ -88,7 +88,6 @@ public:
     void setPasswordType(Shared::AccountPassword pt);
     QString getFullJid() const;
     void sendMessage(const Shared::Message& data);
-    void sendMessage(const Shared::Message& data, const QString& path);
     void requestArchive(const QString& jid, int count, const QString& before);
     void subscribeToContact(const QString& jid, const QString& reason);
     void unsubscribeFromContact(const QString& jid, const QString& reason);
@@ -97,12 +96,14 @@ public:
     void addContactToGroupRequest(const QString& jid, const QString& groupName);
     void removeContactFromGroupRequest(const QString& jid, const QString& groupName);
     void renameContactRequest(const QString& jid, const QString& newName);
+    void requestChangeMessage(const QString& jid, const QString& messageId, const QMap<QString, QVariant>& data);
     
     void setRoomJoined(const QString& jid, bool joined);
     void setRoomAutoJoin(const QString& jid, bool joined);
     void removeRoomRequest(const QString& jid);
     void addRoomRequest(const QString& jid, const QString& nick, const QString& password, bool autoJoin);
     void uploadVCard(const Shared::VCard& card);
+    void resendMessage(const QString& jid, const QString& id);
     
 public slots:
     void connect();
@@ -127,14 +128,14 @@ signals:
     void removePresence(const QString& jid, const QString& name);
     void message(const Shared::Message& data);
     void changeMessage(const QString& jid, const QString& id, const QMap<QString, QVariant>& data);
-    void responseArchive(const QString& jid, const std::list<Shared::Message>& list);
+    void responseArchive(const QString& jid, const std::list<Shared::Message>& list, bool last);
     void error(const QString& text);
     void addRoomParticipant(const QString& jid, const QString& nickName, const QMap<QString, QVariant>& data);
     void changeRoomParticipant(const QString& jid, const QString& nickName, const QMap<QString, QVariant>& data);
     void removeRoomParticipant(const QString& jid, const QString& nickName);
     void receivedVCard(const QString& jid, const Shared::VCard& card);
     void uploadFile(const QFileInfo& file, const QUrl& set, const QUrl& get, QMap<QString, QString> headers);
-    void uploadFileError(const QString& messageId, const QString& error);
+    void uploadFileError(const QString& jid, const QString& messageId, const QString& error);
     
 private:
     QString name;
@@ -183,6 +184,7 @@ private slots:
 
     void onDiscoveryItemsReceived (const QXmppDiscoveryIq& items);
     void onDiscoveryInfoReceived (const QXmppDiscoveryIq& info);
+    void onContactHistoryResponse(const std::list<Shared::Message>& list, bool last);
   
 private:
     void handleDisconnection();

core/archive.cpp

@@ -271,6 +271,8 @@ void Core::Archive::changeMessage(const QString& id, const QMap<QString, QVarian
         bool hadStanzaId = msg.getStanzaId().size() > 0;
         QDateTime oTime = msg.getTime();
         bool idChange = msg.change(data);
+        QDateTime nTime = msg.getTime();
+        bool orderChange = oTime != nTime;
         
         MDB_val lmdbKey, lmdbData;
         QByteArray ba;
@@ -280,15 +282,21 @@ void Core::Archive::changeMessage(const QString& id, const QMap<QString, QVarian
         lmdbKey.mv_size = strId.size();
         lmdbKey.mv_data = (char*)strId.c_str();
         int rc;
-        if (idChange) {
-            rc = mdb_del(txn, main, &lmdbKey, &lmdbData);
+        if (idChange || orderChange) {
+            if (idChange) {
+                rc = mdb_del(txn, main, &lmdbKey, &lmdbData);
+            } else {
+                quint64 ostamp = oTime.toMSecsSinceEpoch();
+                lmdbData.mv_data = (quint8*)&ostamp;
+                lmdbData.mv_size = 8;
+                rc = mdb_del(txn, order, &lmdbData, &lmdbKey);
+            }
             if (rc == 0) {
                 strId = msg.getId().toStdString();
                 lmdbKey.mv_size = strId.size();
                 lmdbKey.mv_data = (char*)strId.c_str();
                 
-                
-                quint64 stamp = oTime.toMSecsSinceEpoch();
+                quint64 stamp = nTime.toMSecsSinceEpoch();
                 lmdbData.mv_data = (quint8*)&stamp;
                 lmdbData.mv_size = 8;
                 rc = mdb_put(txn, order, &lmdbData, &lmdbKey, 0);
@@ -300,8 +308,9 @@ void Core::Archive::changeMessage(const QString& id, const QMap<QString, QVarian
             }
         }
         
-        if (msg.getStanzaId().size() > 0 && (idChange || !hadStanzaId)) {
-            const std::string& szid = msg.getStanzaId().toStdString();
+        QString qsid = msg.getStanzaId();
+        if (qsid.size() > 0 && (idChange || !hadStanzaId)) {
+            std::string szid = qsid.toStdString();
             
             lmdbData.mv_size = szid.size();
             lmdbData.mv_data = (char*)szid.c_str();
@@ -502,8 +511,9 @@ long unsigned int Core::Archive::size() const
     mdb_txn_begin(environment, NULL, MDB_RDONLY, &txn);
     MDB_stat stat;
     mdb_stat(txn, order, &stat);
+    size_t amount = stat.ms_entries;
     mdb_txn_abort(txn);
-    return stat.ms_entries;
+    return amount;
 }
 
 std::list<Shared::Message> Core::Archive::getBefore(int count, const QString& id)
@@ -603,10 +613,10 @@ void Core::Archive::setFromTheBeginning(bool is)
         MDB_txn *txn;
         mdb_txn_begin(environment, NULL, 0, &txn);
         bool success = setStatValue("beginning", is, txn);
-        if (success != 0) {
-            mdb_txn_abort(txn);
-        } else {
+        if (success) {
             mdb_txn_commit(txn);
+        } else {
+            mdb_txn_abort(txn);
         }
     }
 }

core/archive.h

@@ -25,7 +25,7 @@
 #include <QMimeType>
 
 #include "shared/message.h"
-#include "exception.h"
+#include "shared/exception.h"
 #include <lmdb.h>
 #include <list>
 

core/handlers/CMakeLists.txt

@@ -0,0 +1,6 @@
+target_sources(squawk PRIVATE
+  messagehandler.cpp
+  messagehandler.h
+  rosterhandler.cpp
+  rosterhandler.h
+  )

core/handlers/messagehandler.cpp

@@ -23,7 +23,6 @@ Core::MessageHandler::MessageHandler(Core::Account* account):
     QObject(),
     acc(account),
     pendingStateMessages(),
-    pendingMessages(),
     uploadingSlotsQueue()
 {
 }
@@ -74,8 +73,7 @@ void Core::MessageHandler::onMessageReceived(const QXmppMessage& msg)
 
 bool Core::MessageHandler::handleChatMessage(const QXmppMessage& msg, bool outgoing, bool forwarded, bool guessing)
 {
-    const QString& body(msg.body());
-    if (body.size() != 0) {
+    if (msg.body().size() != 0 || msg.outOfBandUrl().size() > 0) {
         Shared::Message sMsg(Shared::Message::chat);
         initializeMessage(sMsg, msg, outgoing, forwarded, guessing);
         QString jid = sMsg.getPenPalJid();
@@ -168,14 +166,16 @@ void Core::MessageHandler::initializeMessage(Shared::Message& target, const QXmp
     id = source.id();
 #endif
     target.setId(id);
-    if (target.getId().size() == 0) {
+    QString messageId = target.getId();
+    if (messageId.size() == 0) {
         target.generateRandomId();          //TODO out of desperation, I need at least a random ID
+        messageId = target.getId();
     }
     target.setFrom(source.from());
     target.setTo(source.to());
     target.setBody(source.body());
     target.setForwarded(forwarded);
-    target.setOutOfBandUrl(source.outOfBandUrl());
+    
     if (guessing) {
         if (target.getFromJid() == acc->getLogin() + "@" + acc->getServer()) {
             outgoing = true;
@@ -189,6 +189,12 @@ void Core::MessageHandler::initializeMessage(Shared::Message& target, const QXmp
     } else {
         target.setCurrentTime();
     }
+    
+    QString oob = source.outOfBandUrl();
+    if (oob.size() > 0) {
+        target.setAttachPath(acc->network->addMessageAndCheckForPath(oob, acc->getName(), target.getPenPalJid(), messageId));
+    }
+    target.setOutOfBandUrl(oob);
 }
 
 void Core::MessageHandler::logMessage(const QXmppMessage& msg, const QString& reason)
@@ -227,16 +233,29 @@ void Core::MessageHandler::onReceiptReceived(const QString& jid, const QString&
         if (ri != 0) {
             ri->changeMessage(id, cData);
         }
-        pendingStateMessages.erase(itr);
         emit acc->changeMessage(itr->second, id, cData);
+        pendingStateMessages.erase(itr);
     }
 }
 
-void Core::MessageHandler::sendMessage(Shared::Message data)
+void Core::MessageHandler::sendMessage(const Shared::Message& data, bool newMessage)
+{
+    if (data.getOutOfBandUrl().size() == 0 && data.getAttachPath().size() > 0) {
+        prepareUpload(data, newMessage);
+    } else {
+        performSending(data, newMessage);
+    }
+}
+
+void Core::MessageHandler::performSending(Shared::Message data, bool newMessage)
 {
     QString jid = data.getPenPalJid();
     QString id = data.getId();
+    QString oob = data.getOutOfBandUrl();
     RosterItem* ri = acc->rh->getRosterItem(jid);
+    bool sent = false;
+    QMap<QString, QVariant> changes;
+    QDateTime sendTime = QDateTime::currentDateTimeUtc();
     if (acc->state == Shared::ConnectionState::connected) {
         QXmppMessage msg(acc->getFullJid(), data.getTo(), data.getBody(), data.getThread());
         
@@ -245,23 +264,18 @@ void Core::MessageHandler::sendMessage(Shared::Message data)
 #endif
         msg.setId(id);
         msg.setType(static_cast<QXmppMessage::Type>(data.getType()));       //it is safe here, my type is compatible
-        msg.setOutOfBandUrl(data.getOutOfBandUrl());
+        msg.setOutOfBandUrl(oob);
         msg.setReceiptRequested(true);
+        msg.setStamp(sendTime);
         
-        bool sent = acc->client.sendPacket(msg);
+        sent = acc->client.sendPacket(msg);
+        //sent = false;
         
         if (sent) {
             data.setState(Shared::Message::State::sent);
         } else {
             data.setState(Shared::Message::State::error);
-            data.setErrorText("Couldn't send message via QXMPP library check out logs");
-        }
-        
-        if (ri != 0) {
-            ri->appendMessageToArchive(data);
-            if (sent) {
-                pendingStateMessages.insert(std::make_pair(id, jid));
-            }
+            data.setErrorText("Couldn't send message: internal QXMPP library error, probably need to check out the logs");
         }
         
     } else {
@@ -269,57 +283,97 @@ void Core::MessageHandler::sendMessage(Shared::Message data)
         data.setErrorText("You are is offline or reconnecting");
     }
     
-    emit acc->changeMessage(jid, id, {
-        {"state", static_cast<uint>(data.getState())},
-        {"errorText", data.getErrorText()}
-    });
+    Shared::Message::State mstate = data.getState();
+    changes.insert("state", static_cast<uint>(mstate));
+    if (mstate == Shared::Message::State::error) {
+        changes.insert("errorText", data.getErrorText());
+    }
+    if (oob.size() > 0) {
+        changes.insert("outOfBandUrl", oob);
+    }
+    if (newMessage) {
+        data.setTime(sendTime);
+    }
+    changes.insert("stamp", sendTime);
+    
+    if (ri != 0) {
+        if (newMessage) {
+            ri->appendMessageToArchive(data);
+        } else {
+            ri->changeMessage(id, changes);
+        }
+        if (sent) {
+            pendingStateMessages.insert(std::make_pair(id, jid));
+        } else {
+            pendingStateMessages.erase(id);
+        }
+    }
+    
+    emit acc->changeMessage(jid, id, changes);
 }
 
-void Core::MessageHandler::sendMessage(const Shared::Message& data, const QString& path)
+void Core::MessageHandler::prepareUpload(const Shared::Message& data, bool newMessage)
 {
     if (acc->state == Shared::ConnectionState::connected) {
+        QString jid = data.getPenPalJid();
+        QString id = data.getId();
+        RosterItem* ri = acc->rh->getRosterItem(jid);
+        if (!ri) {
+            qDebug() << "An attempt to initialize upload in" << acc->name << "for pal" << jid << "but the object for this pal wasn't found, something went terrebly wrong, skipping send";
+            return;
+        }
+        QString path = data.getAttachPath();
         QString url = acc->network->getFileRemoteUrl(path);
         if (url.size() != 0) {
-            sendMessageWithLocalUploadedFile(data, url);
+            sendMessageWithLocalUploadedFile(data, url, newMessage);
         } else {
-            if (acc->network->isUploading(path, data.getId())) {
-                pendingMessages.emplace(data.getId(), data);
+            pendingStateMessages.insert(std::make_pair(id, jid));
+            if (newMessage) {
+                ri->appendMessageToArchive(data);
             } else {
+                QMap<QString, QVariant> changes({
+                    {"state", (uint)Shared::Message::State::pending}
+                });
+                ri->changeMessage(id, changes);
+                emit acc->changeMessage(jid, id, changes);
+            }
+            //this checks if the file is already uploading, and if so it subscribes to it's success, so, i need to do stuff only if the network knows nothing of this file
+            if (!acc->network->checkAndAddToUploading(acc->getName(), jid, id, path)) {
                 if (acc->um->serviceFound()) {
                     QFileInfo file(path);
                     if (file.exists() && file.isReadable()) {
-                        uploadingSlotsQueue.emplace_back(path, data);
+                        pendingStateMessages.insert(std::make_pair(id, jid));
+                        uploadingSlotsQueue.emplace_back(path, id);
                         if (uploadingSlotsQueue.size() == 1) {
                             acc->um->requestUploadSlot(file);
                         }
                     } else {
-                        onFileUploadError(data.getId(), "Uploading file no longer exists or your system user has no permission to read it");
+                        handleUploadError(jid, id, "Uploading file no longer exists or your system user has no permission to read it");
                         qDebug() << "Requested upload slot in account" << acc->name << "for file" << path << "but the file doesn't exist or is not readable";
                     }
                 } else {
-                    onFileUploadError(data.getId(), "Your server doesn't support file upload service, or it's prohibited for your account");
+                    handleUploadError(jid, id, "Your server doesn't support file upload service, or it's prohibited for your account");
                     qDebug() << "Requested upload slot in account" << acc->name << "for file" << path << "but upload manager didn't discover any upload services";
                 }
             }
         }
     } else {
-        onFileUploadError(data.getId(), "Account is offline or reconnecting");
+        handleUploadError(data.getPenPalJid(), data.getId(), "Account is offline or reconnecting");
         qDebug() << "An attempt to send message with not connected account " << acc->name << ", skipping";
     }
 }
 
-
 void Core::MessageHandler::onUploadSlotReceived(const QXmppHttpUploadSlotIq& slot)
 {
     if (uploadingSlotsQueue.size() == 0) {
         qDebug() << "HTTP Upload manager of account" << acc->name << "reports about success requesting upload slot, but none was requested";
     } else {
-        const std::pair<QString, Shared::Message>& pair = uploadingSlotsQueue.front();
-        const QString& mId = pair.second.getId();
-        acc->network->uploadFile(mId, pair.first, slot.putUrl(), slot.getUrl(), slot.putHeaders());
-        pendingMessages.emplace(mId, pair.second);
-        uploadingSlotsQueue.pop_front();
+        const std::pair<QString, QString>& pair = uploadingSlotsQueue.front();
+        const QString& mId = pair.second;
+        QString palJid = pendingStateMessages.at(mId);
+        acc->network->uploadFile({acc->name, palJid, mId}, pair.first, slot.putUrl(), slot.getUrl(), slot.putHeaders());
         
+        uploadingSlotsQueue.pop_front();
         if (uploadingSlotsQueue.size() > 0) {
             acc->um->requestUploadSlot(uploadingSlotsQueue.front().first);
         }
@@ -328,44 +382,130 @@ void Core::MessageHandler::onUploadSlotReceived(const QXmppHttpUploadSlotIq& slo
 
 void Core::MessageHandler::onUploadSlotRequestFailed(const QXmppHttpUploadRequestIq& request)
 {
+    QString err(request.error().text());
     if (uploadingSlotsQueue.size() == 0) {
         qDebug() << "HTTP Upload manager of account" << acc->name << "reports about an error requesting upload slot, but none was requested";
-        qDebug() << request.error().text();
+        qDebug() << err;
     } else {
-        const std::pair<QString, Shared::Message>& pair = uploadingSlotsQueue.front();
-        qDebug() << "Error requesting upload slot for file" << pair.first << "in account" << acc->name << ":" << request.error().text();
-        emit acc->uploadFileError(pair.second.getId(), "Error requesting slot to upload file: " + request.error().text());
+        const std::pair<QString, QString>& pair = uploadingSlotsQueue.front();
+        qDebug() << "Error requesting upload slot for file" << pair.first << "in account" << acc->name << ":" << err;
+        handleUploadError(pendingStateMessages.at(pair.second), pair.second, err);
         
+        uploadingSlotsQueue.pop_front();
         if (uploadingSlotsQueue.size() > 0) {
             acc->um->requestUploadSlot(uploadingSlotsQueue.front().first);
         }
-        uploadingSlotsQueue.pop_front();
     }
 }
 
-void Core::MessageHandler::onFileUploaded(const QString& messageId, const QString& url)
+void Core::MessageHandler::onDownloadFileComplete(const std::list<Shared::MessageInfo>& msgs, const QString& path)
 {
-    std::map<QString, Shared::Message>::const_iterator itr = pendingMessages.find(messageId);
-    if (itr != pendingMessages.end()) {
-        sendMessageWithLocalUploadedFile(itr->second, url);
-        pendingMessages.erase(itr);
+    QMap<QString, QVariant> cData = {
+        {"attachPath", path}
+    };
+    for (const Shared::MessageInfo& info : msgs) {
+        if (info.account == acc->getName()) {
+            RosterItem* cnt = acc->rh->getRosterItem(info.jid);
+            if (cnt != 0) {
+                if (cnt->changeMessage(info.messageId, cData)) {
+                    emit acc->changeMessage(info.jid, info.messageId, cData);
+                }
+            }
+        }
     }
 }
 
-void Core::MessageHandler::onFileUploadError(const QString& messageId, const QString& errMsg)
+void Core::MessageHandler::onLoadFileError(const std::list<Shared::MessageInfo>& msgs, const QString& text, bool up)
 {
-    std::map<QString, Shared::Message>::const_iterator itr = pendingMessages.find(messageId);
-    if (itr != pendingMessages.end()) {
-        pendingMessages.erase(itr);
+    if (up) {
+        for (const Shared::MessageInfo& info : msgs) {
+            if (info.account == acc->getName()) {
+                handleUploadError(info.jid, info.messageId, text);
+            }
+        }
     }
 }
 
-void Core::MessageHandler::sendMessageWithLocalUploadedFile(Shared::Message msg, const QString& url)
+void Core::MessageHandler::handleUploadError(const QString& jid, const QString& messageId, const QString& errorText)
+{
+    emit acc->uploadFileError(jid, messageId, "Error requesting slot to upload file: " + errorText);
+    pendingStateMessages.erase(jid);
+    requestChangeMessage(jid, messageId, {
+        {"state", static_cast<uint>(Shared::Message::State::error)},
+        {"errorText", errorText}
+    });
+}
+
+void Core::MessageHandler::onUploadFileComplete(const std::list<Shared::MessageInfo>& msgs, const QString& path)
+{
+    for (const Shared::MessageInfo& info : msgs) {
+        if (info.account == acc->getName()) {
+            RosterItem* ri = acc->rh->getRosterItem(info.jid);
+            if (ri != 0) {
+                Shared::Message msg = ri->getMessage(info.messageId);
+                sendMessageWithLocalUploadedFile(msg, path, false);
+            } else {
+                qDebug() << "A signal received about complete upload to" << acc->name << "for pal" << info.jid << "but the object for this pal wasn't found, something went terrebly wrong, skipping send";
+            }
+        }
+    }
+}
+
+void Core::MessageHandler::sendMessageWithLocalUploadedFile(Shared::Message msg, const QString& url, bool newMessage)
 {
     msg.setOutOfBandUrl(url);
-    if (msg.getBody().size() == 0) {
-        msg.setBody(url);
-    }
-    sendMessage(msg);
+    if (msg.getBody().size() == 0) {    //not sure why, but most messages do that
+        msg.setBody(url);               //they duplicate oob in body, some of them wouldn't even show an attachment if you don't do that
+    }                                   
+    performSending(msg, newMessage);
     //TODO removal/progress update
 }
+
+static const std::set<QString> allowerToChangeKeys({
+    "attachPath",
+    "outOfBandUrl",
+    "state",
+    "errorText"
+});
+
+void Core::MessageHandler::requestChangeMessage(const QString& jid, const QString& messageId, const QMap<QString, QVariant>& data)
+{
+    RosterItem* cnt = acc->rh->getRosterItem(jid);
+    if (cnt != 0) {
+        bool allSupported = true;
+        QString unsupportedString;
+        for (QMap<QString, QVariant>::const_iterator itr = data.begin(); itr != data.end(); ++itr) {        //I need all this madness 
+            if (allowerToChangeKeys.count(itr.key()) != 1) {                                                //to not allow this method
+                allSupported = false;                                                                       //to make a message to look like if it was edited
+                unsupportedString = itr.key();                                                              //basically I needed to control who exaclty calls this method
+                break;                                                                                      //because the underlying tech assumes that the change is initiated by user
+            }                                                                                               //not by system
+        }
+        if (allSupported) {
+            cnt->changeMessage(messageId, data);
+            emit acc->changeMessage(jid, messageId, data);
+        } else {
+            qDebug() << "A request to change message" << messageId << "of conversation" << jid << "with following data" << data;
+            qDebug() << "only limited set of dataFields are supported yet here, and" << unsupportedString << "isn't one of them, skipping";
+        }
+    }
+}
+
+void Core::MessageHandler::resendMessage(const QString& jid, const QString& id)
+{
+    RosterItem* cnt = acc->rh->getRosterItem(jid);
+    if (cnt != 0) {
+        try {
+            Shared::Message msg = cnt->getMessage(id);
+            if (msg.getState() == Shared::Message::State::error) {
+                sendMessage(msg, false);
+            } else {
+                qDebug() << "An attempt to resend a message to" << jid << "by account" << acc->getName() << ", but this message seems to have been normally sent, this method was made to retry sending failed to be sent messages, skipping";
+            }
+        } catch (const Archive::NotFound& err) {
+            qDebug() << "An attempt to resend a message to" << jid << "by account" << acc->getName() << ", but this message wasn't found in history, skipping";
+        }
+    } else {
+        qDebug() << "An attempt to resend a message to" << jid << "by account" << acc->getName() << ", but this jid isn't present in account roster, skipping";
+    }
+}

core/handlers/messagehandler.h

@@ -28,6 +28,7 @@
 #include <QXmppHttpUploadIq.h>
 
 #include <shared/message.h>
+#include <shared/messageinfo.h>
 
 namespace Core {
 
@@ -44,9 +45,9 @@ public:
     MessageHandler(Account* account);
     
 public:
-    void sendMessage(Shared::Message data);
-    void sendMessage(const Shared::Message& data, const QString& path);
+    void sendMessage(const Shared::Message& data, bool newMessage = true);
     void initializeMessage(Shared::Message& target, const QXmppMessage& source, bool outgoing = false, bool forwarded = false, bool guessing = false) const;
+    void resendMessage(const QString& jid, const QString& id);
     
 public slots:
     void onMessageReceived(const QXmppMessage& message);
@@ -55,20 +56,24 @@ public slots:
     void onReceiptReceived(const QString& jid, const QString& id);    
     void onUploadSlotReceived(const QXmppHttpUploadSlotIq& slot);
     void onUploadSlotRequestFailed(const QXmppHttpUploadRequestIq& request);
-    void onFileUploaded(const QString& messageId, const QString& url);
-    void onFileUploadError(const QString& messageId, const QString& errMsg);
+    void onDownloadFileComplete(const std::list<Shared::MessageInfo>& msgs, const QString& path);
+    void onUploadFileComplete(const std::list<Shared::MessageInfo>& msgs, const QString& path);
+    void onLoadFileError(const std::list<Shared::MessageInfo>& msgs, const QString& path, bool up);
+    void requestChangeMessage(const QString& jid, const QString& messageId, const QMap<QString, QVariant>& data);
     
 private:
     bool handleChatMessage(const QXmppMessage& msg, bool outgoing = false, bool forwarded = false, bool guessing = false);
     bool handleGroupMessage(const QXmppMessage& msg, bool outgoing = false, bool forwarded = false, bool guessing = false);
     void logMessage(const QXmppMessage& msg, const QString& reason = "Message wasn't handled: ");
-    void sendMessageWithLocalUploadedFile(Shared::Message msg, const QString& url);
+    void sendMessageWithLocalUploadedFile(Shared::Message msg, const QString& url, bool newMessage = true);
+    void performSending(Shared::Message data, bool newMessage = true);
+    void prepareUpload(const Shared::Message& data, bool newMessage = true);
+    void handleUploadError(const QString& jid, const QString& messageId, const QString& errorText);
     
 private:
     Account* acc;
-    std::map<QString, QString> pendingStateMessages;
-    std::map<QString, Shared::Message> pendingMessages;
-    std::deque<std::pair<QString, Shared::Message>> uploadingSlotsQueue;
+    std::map<QString, QString> pendingStateMessages;        //key is message id, value is JID
+    std::deque<std::pair<QString, QString>> uploadingSlotsQueue;
 };
 
 }

core/handlers/rosterhandler.cpp

@@ -190,7 +190,7 @@ void Core::RosterHandler::removeContactRequest(const QString& jid)
 void Core::RosterHandler::handleNewRosterItem(Core::RosterItem* contact)
 {
     connect(contact, &RosterItem::needHistory, this->acc, &Account::onContactNeedHistory);
-    connect(contact, &RosterItem::historyResponse, this, &RosterHandler::onContactHistoryResponse);
+    connect(contact, &RosterItem::historyResponse, this->acc, &Account::onContactHistoryResponse);
     connect(contact, &RosterItem::nameChanged, this, &RosterHandler::onContactNameChanged);
     connect(contact, &RosterItem::avatarChanged, this, &RosterHandler::onContactAvatarChanged);
     connect(contact, &RosterItem::requestVCard, this->acc, &Account::requestVCard);
@@ -315,14 +315,6 @@ void Core::RosterHandler::removeFromGroup(const QString& jid, const QString& gro
     }
 }
 
-void Core::RosterHandler::onContactHistoryResponse(const std::list<Shared::Message>& list)
-{
-    RosterItem* contact = static_cast<RosterItem*>(sender());
-    
-    qDebug() << "Collected history for contact " << contact->jid << list.size() << "elements";
-    emit acc->responseArchive(contact->jid, list);
-}
-
 Core::RosterItem * Core::RosterHandler::getRosterItem(const QString& jid)
 {
     RosterItem* item = 0;

core/handlers/rosterhandler.h

@@ -86,7 +86,6 @@ private slots:
     void onContactGroupRemoved(const QString& group);
     void onContactNameChanged(const QString& name);
     void onContactSubscriptionStateChanged(Shared::SubscriptionState state);
-    void onContactHistoryResponse(const std::list<Shared::Message>& list);
     void onContactAvatarChanged(Shared::Avatar, const QString& path);
     
 private:

core/main.cpp

@@ -16,23 +16,26 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "ui/squawk.h"
-#include "core/squawk.h"
+#include "../shared/global.h"
+#include "../shared/messageinfo.h"
+#include "../ui/squawk.h"
 #include "signalcatcher.h"
-#include "shared/global.h"
-#include <QtWidgets/QApplication>
-#include <QtCore/QThread>
-#include <QtCore/QObject>
-#include <QSettings>
-#include <QTranslator>
+#include "squawk.h"
 #include <QLibraryInfo>
+#include <QSettings>
 #include <QStandardPaths>
+#include <QTranslator>
+#include <QtCore/QObject>
+#include <QtCore/QThread>
+#include <QtWidgets/QApplication>
 
 int main(int argc, char *argv[])
 {
     qRegisterMetaType<Shared::Message>("Shared::Message");
+    qRegisterMetaType<Shared::MessageInfo>("Shared::MessageInfo");
     qRegisterMetaType<Shared::VCard>("Shared::VCard");
     qRegisterMetaType<std::list<Shared::Message>>("std::list<Shared::Message>");
+    qRegisterMetaType<std::list<Shared::MessageInfo>>("std::list<Shared::MessageInfo>");
     qRegisterMetaType<QSet<QString>>("QSet<QString>");
     qRegisterMetaType<Shared::ConnectionState>("Shared::ConnectionState");
     qRegisterMetaType<Shared::Availability>("Shared::Availability");
@@ -96,10 +99,8 @@ int main(int argc, char *argv[])
     QObject::connect(&w, &Squawk::connectAccount, squawk, &Core::Squawk::connectAccount);
     QObject::connect(&w, &Squawk::disconnectAccount, squawk, &Core::Squawk::disconnectAccount);
     QObject::connect(&w, &Squawk::changeState, squawk, &Core::Squawk::changeState);
-    QObject::connect(&w, qOverload<const QString&, const Shared::Message&>(&Squawk::sendMessage), 
-                     squawk, qOverload<const QString&, const Shared::Message&>(&Core::Squawk::sendMessage));
-    QObject::connect(&w, qOverload<const QString&, const Shared::Message&, const QString&>(&Squawk::sendMessage), 
-                     squawk, qOverload<const QString&, const Shared::Message&, const QString&>(&Core::Squawk::sendMessage));
+    QObject::connect(&w, &Squawk::sendMessage, squawk,&Core::Squawk::sendMessage);
+    QObject::connect(&w, &Squawk::resendMessage, squawk,&Core::Squawk::resendMessage);
     QObject::connect(&w, &Squawk::requestArchive, squawk, &Core::Squawk::requestArchive);
     QObject::connect(&w, &Squawk::subscribeContact, squawk, &Core::Squawk::subscribeContact);
     QObject::connect(&w, &Squawk::unsubscribeContact, squawk, &Core::Squawk::unsubscribeContact);
@@ -109,14 +110,14 @@ int main(int argc, char *argv[])
     QObject::connect(&w, &Squawk::setRoomAutoJoin, squawk, &Core::Squawk::setRoomAutoJoin);
     QObject::connect(&w, &Squawk::removeRoomRequest, squawk, &Core::Squawk::removeRoomRequest);
     QObject::connect(&w, &Squawk::addRoomRequest, squawk, &Core::Squawk::addRoomRequest);
-    QObject::connect(&w, &Squawk::fileLocalPathRequest, squawk, &Core::Squawk::fileLocalPathRequest);
-    QObject::connect(&w, &Squawk::downloadFileRequest, squawk, &Core::Squawk::downloadFileRequest);
+    QObject::connect(&w, &Squawk::fileDownloadRequest, squawk, &Core::Squawk::fileDownloadRequest);
     QObject::connect(&w, &Squawk::addContactToGroupRequest, squawk, &Core::Squawk::addContactToGroupRequest);
     QObject::connect(&w, &Squawk::removeContactFromGroupRequest, squawk, &Core::Squawk::removeContactFromGroupRequest);
     QObject::connect(&w, &Squawk::renameContactRequest, squawk, &Core::Squawk::renameContactRequest);
     QObject::connect(&w, &Squawk::requestVCard, squawk, &Core::Squawk::requestVCard);
     QObject::connect(&w, &Squawk::uploadVCard, squawk, &Core::Squawk::uploadVCard);
     QObject::connect(&w, &Squawk::responsePassword, squawk, &Core::Squawk::responsePassword);
+    QObject::connect(&w, &Squawk::localPathInvalid, squawk, &Core::Squawk::onLocalPathInvalid);
     
     QObject::connect(squawk, &Core::Squawk::newAccount, &w, &Squawk::newAccount);
     QObject::connect(squawk, &Core::Squawk::addContact, &w, &Squawk::addContact);
@@ -141,11 +142,10 @@ int main(int argc, char *argv[])
     QObject::connect(squawk, &Core::Squawk::addRoomParticipant, &w, &Squawk::addRoomParticipant);
     QObject::connect(squawk, &Core::Squawk::changeRoomParticipant, &w, &Squawk::changeRoomParticipant);
     QObject::connect(squawk, &Core::Squawk::removeRoomParticipant, &w, &Squawk::removeRoomParticipant);
-    QObject::connect(squawk, &Core::Squawk::fileLocalPathResponse, &w, &Squawk::fileLocalPathResponse);
-    QObject::connect(squawk, &Core::Squawk::downloadFileProgress, &w, &Squawk::fileProgress);
-    QObject::connect(squawk, &Core::Squawk::downloadFileError, &w, &Squawk::fileError);
-    QObject::connect(squawk, &Core::Squawk::uploadFileProgress, &w, &Squawk::fileProgress);
-    QObject::connect(squawk, &Core::Squawk::uploadFileError, &w, &Squawk::fileError);
+    QObject::connect(squawk, &Core::Squawk::fileDownloadComplete, &w, &Squawk::fileDownloadComplete);
+    QObject::connect(squawk, &Core::Squawk::fileUploadComplete, &w, &Squawk::fileUploadComplete);
+    QObject::connect(squawk, &Core::Squawk::fileProgress, &w, &Squawk::fileProgress);
+    QObject::connect(squawk, &Core::Squawk::fileError, &w, &Squawk::fileError);
     QObject::connect(squawk, &Core::Squawk::responseVCard, &w, &Squawk::responseVCard);
     QObject::connect(squawk, &Core::Squawk::requestPassword, &w, &Squawk::requestPassword);
     QObject::connect(squawk, &Core::Squawk::ready, &w, &Squawk::readSettings);

core/networkaccess.cpp

@@ -16,13 +16,17 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+
+#include <QtWidgets/QApplication>
+#include <QtCore/QDir>
+
 #include "networkaccess.h"
 
 Core::NetworkAccess::NetworkAccess(QObject* parent):
     QObject(parent),
     running(false),
     manager(0),
-    files("files"),
+    storage("fileURLStorage"),
     downloads(),
     uploads()
 {
@@ -33,60 +37,31 @@ Core::NetworkAccess::~NetworkAccess()
     stop();
 }
 
-void Core::NetworkAccess::fileLocalPathRequest(const QString& messageId, const QString& url)
+void Core::NetworkAccess::downladFile(const QString& url)
 {
     std::map<QString, Transfer*>::iterator itr = downloads.find(url);
     if (itr != downloads.end()) {
-        Transfer* dwn = itr->second;
-        std::set<QString>::const_iterator mItr = dwn->messages.find(messageId);
-        if (mItr == dwn->messages.end()) {
-            dwn->messages.insert(messageId);
-        }
-        emit downloadFileProgress(messageId, dwn->progress);
+        qDebug() << "NetworkAccess received a request to download a file" << url << ", but the file is currently downloading, skipping";
     } else {
         try {
-            QString path = files.getRecord(url);
-            QFileInfo info(path);
-            if (info.exists() && info.isFile()) {
-                emit fileLocalPathResponse(messageId, path);
+            std::pair<QString, std::list<Shared::MessageInfo>> p = storage.getPath(url);
+            if (p.first.size() > 0) {
+                QFileInfo info(p.first);
+                if (info.exists() && info.isFile()) {
+                    emit downloadFileComplete(p.second, p.first);
+                } else {
+                    startDownload(p.second, url);
+                }
             } else {
-                files.removeRecord(url);
-                emit fileLocalPathResponse(messageId, "");
+                startDownload(p.second, url);
             }
         } catch (const Archive::NotFound& e) {
-            emit fileLocalPathResponse(messageId, "");
+            qDebug() << "NetworkAccess received a request to download a file" << url << ", but there is now record of which message uses that file, downloading anyway";
+            storage.addFile(url);
+            startDownload(std::list<Shared::MessageInfo>(), url);
         } catch (const Archive::Unknown& e) {
             qDebug() << "Error requesting file path:" << e.what();
-            emit fileLocalPathResponse(messageId, "");
-        }
-    }
-}
-
-void Core::NetworkAccess::downladFileRequest(const QString& messageId, const QString& url)
-{
-    std::map<QString, Transfer*>::iterator itr = downloads.find(url);
-    if (itr != downloads.end()) {
-        Transfer* dwn = itr->second;
-        std::set<QString>::const_iterator mItr = dwn->messages.find(messageId);
-        if (mItr == dwn->messages.end()) {
-            dwn->messages.insert(messageId);
-        }
-        emit downloadFileProgress(messageId, dwn->progress);
-    } else {
-        try {
-            QString path = files.getRecord(url);
-            QFileInfo info(path);
-            if (info.exists() && info.isFile()) {
-                emit fileLocalPathResponse(messageId, path);
-            } else {
-                files.removeRecord(url);
-                startDownload(messageId, url);
-            }
-        } catch (const Archive::NotFound& e) {
-            startDownload(messageId, url);
-        } catch (const Archive::Unknown& e) {
-            qDebug() << "Error requesting file path:" << e.what();
-            emit downloadFileError(messageId, QString("Database error: ") + e.what());
+            emit loadFileError(std::list<Shared::MessageInfo>(), QString("Database error: ") + e.what(), false);
         }
     }
 }
@@ -95,7 +70,10 @@ void Core::NetworkAccess::start()
 {
     if (!running) {
         manager = new QNetworkAccessManager();
-        files.open();
+#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
+        manager->setTransferTimeout();
+#endif
+        storage.open();
         running = true;
     }
 }
@@ -103,7 +81,7 @@ void Core::NetworkAccess::start()
 void Core::NetworkAccess::stop()
 {
     if (running) {
-        files.close();
+        storage.close();
         manager->deleteLater();
         manager = 0;
         running = false;
@@ -124,35 +102,56 @@ void Core::NetworkAccess::onDownloadProgress(qint64 bytesReceived, qint64 bytesT
         qDebug() << "an error downloading" << url << ": the request had some progress but seems like no one is waiting for it, skipping";
     } else {
         Transfer* dwn = itr->second;
-        qreal received = bytesReceived;
-        qreal total = bytesTotal;
-        qreal progress = received/total;
-        dwn->progress = progress;
-        for (std::set<QString>::const_iterator mItr = dwn->messages.begin(), end = dwn->messages.end(); mItr != end; ++mItr) {
-            emit downloadFileProgress(*mItr, progress);
+        if (dwn->success) {
+            qreal received = bytesReceived;
+            qreal total = bytesTotal;
+            qreal progress = received/total;
+            dwn->progress = progress;
+            emit loadFileProgress(dwn->messages, progress, false);
         }
     }
 }
 
 void Core::NetworkAccess::onDownloadError(QNetworkReply::NetworkError code)
 {
+    qDebug() << "DEBUG: DOWNLOAD ERROR";
     QNetworkReply* rpl = static_cast<QNetworkReply*>(sender());
+    qDebug() << rpl->errorString();
     QString url = rpl->url().toString();
     std::map<QString, Transfer*>::const_iterator itr = downloads.find(url);
     if (itr == downloads.end()) {
         qDebug() << "an error downloading" << url << ": the request is reporting an error but seems like no one is waiting for it, skipping";
     } else {
         QString errorText = getErrorText(code);
-        if (errorText.size() > 0) {
+        //if (errorText.size() > 0) {
             itr->second->success = false;
             Transfer* dwn = itr->second;
-            for (std::set<QString>::const_iterator mItr = dwn->messages.begin(), end = dwn->messages.end(); mItr != end; ++mItr) {
-                emit downloadFileError(*mItr, errorText);
-            }
-        }
+            emit loadFileError(dwn->messages, errorText, false);
+        //}
     }
 }
 
+void Core::NetworkAccess::onDownloadSSLError(const QList<QSslError>& errors)
+{
+    qDebug() << "DEBUG: DOWNLOAD SSL ERRORS";
+    for (const QSslError& err : errors) {
+        qDebug() << err.errorString();
+    }
+    QNetworkReply* rpl = static_cast<QNetworkReply*>(sender());
+    QString url = rpl->url().toString();
+    std::map<QString, Transfer*>::const_iterator itr = downloads.find(url);
+    if (itr == downloads.end()) {
+        qDebug() << "an SSL error downloading" << url << ": the request is reporting an error but seems like no one is waiting for it, skipping";
+    } else {
+        //if (errorText.size() > 0) {
+        itr->second->success = false;
+        Transfer* dwn = itr->second;
+        emit loadFileError(dwn->messages, "SSL errors occured", false);
+        //}
+    }
+}
+
+
 QString Core::NetworkAccess::getErrorText(QNetworkReply::NetworkError code)
 {
     QString errorText("");
@@ -175,7 +174,11 @@ QString Core::NetworkAccess::getErrorText(QNetworkReply::NetworkError code)
             errorText = "Connection was closed because it timed out";
             break;
         case QNetworkReply::OperationCanceledError:
-            //this means I closed it myself by abort() or close(), don't think I need to notify here
+            //this means I closed it myself by abort() or close()
+            //I don't call them directory, but this is the error code
+            //Qt returns when it can not resume donwload after the network failure
+            //or when the download is canceled by the timout; 
+            errorText = "Connection lost";
             break;
         case QNetworkReply::SslHandshakeFailedError:
             errorText = "Security error";           //TODO need to handle sslErrors signal to get a better description here
@@ -276,64 +279,63 @@ QString Core::NetworkAccess::getErrorText(QNetworkReply::NetworkError code)
 
 void Core::NetworkAccess::onDownloadFinished()
 {
-    QString path("");
+    qDebug() << "DEBUG: DOWNLOAD FINISHED";
     QNetworkReply* rpl = static_cast<QNetworkReply*>(sender());
     QString url = rpl->url().toString();
     std::map<QString, Transfer*>::const_iterator itr = downloads.find(url);
     if (itr == downloads.end()) {
-        qDebug() << "an error downloading" << url << ": the request is done but seems like noone is waiting for it, skipping";
+        qDebug() << "an error downloading" << url << ": the request is done but there is no record of it being downloaded, ignoring";
     } else {
         Transfer* dwn = itr->second;
         if (dwn->success) {
             qDebug() << "download success for" << url;
+            QString err;
             QStringList hops = url.split("/");
             QString fileName = hops.back();
-            QStringList parts = fileName.split(".");
-            path = QStandardPaths::writableLocation(QStandardPaths::DownloadLocation) + "/";
-            QString suffix("");
-            QStringList::const_iterator sItr = parts.begin();
-            QString realName = *sItr;
-            ++sItr;
-            for (QStringList::const_iterator sEnd = parts.end(); sItr != sEnd; ++sItr) {
-                suffix += "." + (*sItr);
+            QString jid;
+            if (dwn->messages.size() > 0) {
+                jid = dwn->messages.front().jid;
+            } else {
+                qDebug() << "An attempt to save the file but it doesn't seem to belong to any message, download is definately going to be broken";
             }
-            QString postfix("");
-            QFileInfo proposedName(path + realName + postfix + suffix);
-            int counter = 0;
-            while (proposedName.exists()) {
-                postfix = QString("(") + std::to_string(++counter).c_str() + ")";
-                proposedName = QFileInfo(path + realName + postfix + suffix);
+            QString path = prepareDirectory(jid);
+            if (path.size() > 0) {
+                path = checkFileName(fileName, path);
+                
+                QFile file(path);
+                if (file.open(QIODevice::WriteOnly)) {
+                    file.write(dwn->reply->readAll());
+                    file.close();
+                    storage.setPath(url, path);
+                    qDebug() << "file" << path << "was successfully downloaded";
+                } else {
+                    qDebug() << "couldn't save file" << path;
+                    err = "Error opening file to write:" + file.errorString();
+                }
+            } else {
+                err = "Couldn't prepare a directory for file";
             }
             
-            path = proposedName.absoluteFilePath();
-            QFile file(path);
-            if (file.open(QIODevice::WriteOnly)) {
-                file.write(dwn->reply->readAll());
-                file.close();
-                files.addRecord(url, path);
-                qDebug() << "file" << path << "was successfully downloaded";
+            if (path.size() > 0) {
+                emit downloadFileComplete(dwn->messages, path);
             } else {
-                qDebug() << "couldn't save file" << path;
-                path = "";
+                emit loadFileError(dwn->messages, "Error saving file " + url + "; " + err, false);
             }
         }
         
-        for (std::set<QString>::const_iterator mItr = dwn->messages.begin(), end = dwn->messages.end(); mItr != end; ++mItr) {
-            emit fileLocalPathResponse(*mItr, path);
-        }
-        
         dwn->reply->deleteLater();
         delete dwn;
         downloads.erase(itr);
     }
 }
 
-void Core::NetworkAccess::startDownload(const QString& messageId, const QString& url)
+void Core::NetworkAccess::startDownload(const std::list<Shared::MessageInfo>& msgs, const QString& url)
 {
-    Transfer* dwn = new Transfer({{messageId}, 0, 0, true, "", url, 0});
+    Transfer* dwn = new Transfer({msgs, 0, 0, true, "", url, 0});
     QNetworkRequest req(url);
     dwn->reply = manager->get(req);
     connect(dwn->reply, &QNetworkReply::downloadProgress, this, &NetworkAccess::onDownloadProgress);
+    connect(dwn->reply, &QNetworkReply::sslErrors, this, &NetworkAccess::onDownloadSSLError);
 #if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
     connect(dwn->reply, qOverload<QNetworkReply::NetworkError>(&QNetworkReply::errorOccurred), this, &NetworkAccess::onDownloadError);
 #else
@@ -341,7 +343,7 @@ void Core::NetworkAccess::startDownload(const QString& messageId, const QString&
 #endif
     connect(dwn->reply, &QNetworkReply::finished, this, &NetworkAccess::onDownloadFinished);
     downloads.insert(std::make_pair(url, dwn));
-    emit downloadFileProgress(messageId, 0);
+    emit loadFileProgress(dwn->messages, 0, false);
 }
 
 void Core::NetworkAccess::onUploadError(QNetworkReply::NetworkError code)
@@ -350,16 +352,16 @@ void Core::NetworkAccess::onUploadError(QNetworkReply::NetworkError code)
     QString url = rpl->url().toString();
     std::map<QString, Transfer*>::const_iterator itr = uploads.find(url);
     if (itr == uploads.end()) {
-        qDebug() << "an error uploading" << url << ": the request is reporting an error but seems like noone is waiting for it, skipping";
+        qDebug() << "an error uploading" << url << ": the request is reporting an error but there is no record of it being uploading, ignoring";
     } else {
         QString errorText = getErrorText(code);
-        if (errorText.size() > 0) {
+        //if (errorText.size() > 0) {
             itr->second->success = false;
             Transfer* upl = itr->second;
-            for (std::set<QString>::const_iterator mItr = upl->messages.begin(), end = upl->messages.end(); mItr != end; ++mItr) {
-                emit uploadFileError(*mItr, errorText);
-            }
-        }
+            emit loadFileError(upl->messages, errorText, true);
+        //}
+        
+        //TODO deletion?
     }
 }
 
@@ -369,17 +371,14 @@ void Core::NetworkAccess::onUploadFinished()
     QString url = rpl->url().toString();
     std::map<QString, Transfer*>::const_iterator itr = uploads.find(url);
     if (itr == downloads.end()) {
-        qDebug() << "an error uploading" << url << ": the request is done but seems like no one is waiting for it, skipping";
+        qDebug() << "an error uploading" << url << ": the request is done there is no record of it being uploading, ignoring";
     } else {
         Transfer* upl = itr->second;
         if (upl->success) {
             qDebug() << "upload success for" << url;
-            files.addRecord(upl->url, upl->path);
-        
-            for (std::set<QString>::const_iterator mItr = upl->messages.begin(), end = upl->messages.end(); mItr != end; ++mItr) {
-                emit fileLocalPathResponse(*mItr, upl->path);
-                emit uploadFileComplete(*mItr, upl->url);
-            }
+            
+            storage.addFile(upl->messages, upl->url, upl->path);
+            emit uploadFileComplete(upl->messages, upl->url);
         }
         
         upl->reply->deleteLater();
@@ -399,98 +398,35 @@ void Core::NetworkAccess::onUploadProgress(qint64 bytesReceived, qint64 bytesTot
         qDebug() << "an error downloading" << url << ": the request had some progress but seems like no one is waiting for it, skipping";
     } else {
         Transfer* upl = itr->second;
-        qreal received = bytesReceived;
-        qreal total = bytesTotal;
-        qreal progress = received/total;
-        upl->progress = progress;
-        for (std::set<QString>::const_iterator mItr = upl->messages.begin(), end = upl->messages.end(); mItr != end; ++mItr) {
-            emit uploadFileProgress(*mItr, progress);
-        }
-    }
-}
-
-void Core::NetworkAccess::startUpload(const QString& messageId, const QString& url, const QString& path)
-{
-    Transfer* upl = new Transfer({{messageId}, 0, 0, true, path, url, 0});
-    QNetworkRequest req(url);
-    QFile* file = new QFile(path);
-    if (file->open(QIODevice::ReadOnly)) {
-        upl->reply = manager->put(req, file);
-        
-        connect(upl->reply, &QNetworkReply::uploadProgress, this, &NetworkAccess::onUploadProgress);
-#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
-        connect(upl->reply, qOverload<QNetworkReply::NetworkError>(&QNetworkReply::errorOccurred), this, &NetworkAccess::onUploadError);
-#else
-        connect(upl->reply, qOverload<QNetworkReply::NetworkError>(&QNetworkReply::error), this, &NetworkAccess::onUploadError);
-#endif
-        
-        connect(upl->reply, &QNetworkReply::finished, this, &NetworkAccess::onUploadFinished);
-        uploads.insert(std::make_pair(url, upl));
-        emit downloadFileProgress(messageId, 0);
-    } else {
-        qDebug() << "couldn't upload file" << path;
-        emit uploadFileError(messageId, "Error opening file");
-        delete file;
-    }
-}
-
-void Core::NetworkAccess::uploadFileRequest(const QString& messageId, const QString& url, const QString& path)
-{
-    std::map<QString, Transfer*>::iterator itr = uploads.find(url);
-    if (itr != uploads.end()) {
-        Transfer* upl = itr->second;
-        std::set<QString>::const_iterator mItr = upl->messages.find(messageId);
-        if (mItr == upl->messages.end()) {
-            upl->messages.insert(messageId);
-        }
-        emit uploadFileProgress(messageId, upl->progress);
-    } else {
-        try {
-            QString ePath = files.getRecord(url);
-            if (ePath == path) {
-                QFileInfo info(path);
-                if (info.exists() && info.isFile()) {
-                    emit fileLocalPathResponse(messageId, path);
-                } else {
-                    files.removeRecord(url);
-                    startUpload(messageId, url, path);
-                }
-            } else {
-                QFileInfo info(path);
-                if (info.exists() && info.isFile()) {
-                    files.changeRecord(url, path);
-                    emit fileLocalPathResponse(messageId, path);
-                } else {
-                    files.removeRecord(url);
-                    startUpload(messageId, url, path);
-                }
-            }
-        } catch (const Archive::NotFound& e) {
-            startUpload(messageId, url, path);
-        } catch (const Archive::Unknown& e) {
-            qDebug() << "Error requesting file path on upload:" << e.what();
-            emit uploadFileError(messageId, QString("Database error: ") + e.what());
+        if (upl->success) {
+            qreal received = bytesReceived;
+            qreal total = bytesTotal;
+            qreal progress = received/total;
+            upl->progress = progress;
+            emit loadFileProgress(upl->messages, progress, true);
         }
     }
 }
 
 QString Core::NetworkAccess::getFileRemoteUrl(const QString& path)
 {
-    return "";  //TODO this is a way not to upload some file more then 1 time, here I'm supposed to return that file GET url
+    QString p;
+    
+    try {
+        p = storage.getUrl(path);
+    } catch (const Archive::NotFound& err) {
+        
+    } catch (...) {
+        throw;
+    }
+    
+    return p;
 }
 
-bool Core::NetworkAccess::isUploading(const QString& path, const QString& messageId)
-{
-    return false; //TODO this is a way to avoid parallel uploading of the same files by different chats
-                    //   message is is supposed to be added to the uploading messageids list 
-                    //   the result should be true if there was an uploading file with this path
-                    //   message id can be empty, then it's just to check and not to add
-}
-
-void Core::NetworkAccess::uploadFile(const QString& messageId, const QString& path, const QUrl& put, const QUrl& get, const QMap<QString, QString> headers)
+void Core::NetworkAccess::uploadFile(const Shared::MessageInfo& info, const QString& path, const QUrl& put, const QUrl& get, const QMap<QString, QString> headers)
 {
     QFile* file = new QFile(path);
-    Transfer* upl = new Transfer({{messageId}, 0, 0, true, path, get.toString(), file});
+    Transfer* upl = new Transfer({{info}, 0, 0, true, path, get.toString(), file});
     QNetworkRequest req(put);
     for (QMap<QString, QString>::const_iterator itr = headers.begin(), end = headers.end(); itr != end; itr++) {
         req.setRawHeader(itr.key().toUtf8(), itr.value().toUtf8());
@@ -506,10 +442,99 @@ void Core::NetworkAccess::uploadFile(const QString& messageId, const QString& pa
 #endif
         connect(upl->reply, &QNetworkReply::finished, this, &NetworkAccess::onUploadFinished);
         uploads.insert(std::make_pair(put.toString(), upl));
-        emit downloadFileProgress(messageId, 0);
+        emit loadFileProgress(upl->messages, 0, true);
     } else {
         qDebug() << "couldn't upload file" << path;
-        emit uploadFileError(messageId, "Error opening file");
+        emit loadFileError(upl->messages, "Error opening file", true);
         delete file;
+        delete upl;
     }
 }
+
+void Core::NetworkAccess::registerFile(const QString& url, const QString& account, const QString& jid, const QString& id)
+{
+    storage.addFile(url, account, jid, id);
+    std::map<QString, Transfer*>::iterator itr = downloads.find(url);
+    if (itr != downloads.end()) {
+        itr->second->messages.emplace_back(account, jid, id);   //TODO notification is going to happen the next tick, is that okay?
+    }
+}
+
+void Core::NetworkAccess::registerFile(const QString& url, const QString& path, const QString& account, const QString& jid, const QString& id)
+{
+    storage.addFile(url, path, account, jid, id);
+}
+
+bool Core::NetworkAccess::checkAndAddToUploading(const QString& acc, const QString& jid, const QString id, const QString path)
+{
+    for (const std::pair<const QString, Transfer*>& pair : uploads) {
+        Transfer* info = pair.second;
+        if (pair.second->path == path) {
+            std::list<Shared::MessageInfo>& messages = info->messages;
+            bool dup = false;
+            for (const Shared::MessageInfo& info : messages) {
+                if (info.account == acc && info.jid == jid && info.messageId == id) {
+                    dup = true;
+                    break;
+                }
+            }
+            if (!dup) {
+                info->messages.emplace_back(acc, jid, id);   //TODO notification is going to happen the next tick, is that okay?
+                return true;
+            }
+        }
+    }
+    
+    return false;
+}
+
+QString Core::NetworkAccess::prepareDirectory(const QString& jid)
+{
+    QString path = QStandardPaths::writableLocation(QStandardPaths::DownloadLocation);
+    path += "/" + QApplication::applicationName();
+    if (jid.size() > 0) {
+        path += "/" + jid;
+    }
+    QDir location(path);
+    
+    if (!location.exists()) {
+        bool res = location.mkpath(path);
+        if (!res) {
+            return "";
+        } else {
+            return path;
+        }
+    }
+    return path;
+}
+
+QString Core::NetworkAccess::checkFileName(const QString& name, const QString& path)
+{
+    QStringList parts = name.split(".");
+    QString suffix("");
+    QStringList::const_iterator sItr = parts.begin();
+    QString realName = *sItr;
+    ++sItr;
+    for (QStringList::const_iterator sEnd = parts.end(); sItr != sEnd; ++sItr) {
+        suffix += "." + (*sItr);
+    }
+    QString postfix("");
+    QFileInfo proposedName(path + "/" + realName + suffix);
+    int counter = 0;
+    while (proposedName.exists()) {
+        QString count = QString("(") + std::to_string(++counter).c_str() + ")";
+        proposedName = QFileInfo(path + "/" + realName + count + suffix);
+    }
+    
+    return proposedName.absoluteFilePath();
+}
+
+QString Core::NetworkAccess::addMessageAndCheckForPath(const QString& url, const QString& account, const QString& jid, const QString& id)
+{
+    return storage.addMessageAndCheckForPath(url, account, jid, id);
+}
+
+std::list<Shared::MessageInfo> Core::NetworkAccess::reportPathInvalid(const QString& path)
+{
+    return storage.deletedFile(path);
+}

core/networkaccess.h

@@ -29,13 +29,15 @@
 
 #include <set>
 
-#include "storage.h"
+#include "urlstorage.h"
 
 namespace Core {
 
 /**
  * @todo write docs
  */
+
+//TODO Need to describe how to get rid of records when file is no longer reachable;
 class NetworkAccess : public QObject
 {
     Q_OBJECT
@@ -48,30 +50,32 @@ public:
     void stop();
     
     QString getFileRemoteUrl(const QString& path);
-    bool isUploading(const QString& path, const QString& messageId = "");
-    void uploadFile(const QString& messageId, const QString& path, const QUrl& put, const QUrl& get, const QMap<QString, QString> headers);
+    QString addMessageAndCheckForPath(const QString& url, const QString& account, const QString& jid, const QString& id);
+    void uploadFile(const Shared::MessageInfo& info, const QString& path, const QUrl& put, const QUrl& get, const QMap<QString, QString> headers);
+    bool checkAndAddToUploading(const QString& acc, const QString& jid, const QString id, const QString path);
+    std::list<Shared::MessageInfo> reportPathInvalid(const QString& path);
     
 signals:
-    void fileLocalPathResponse(const QString& messageId, const QString& path);
-    void downloadFileProgress(const QString& messageId, qreal value);
-    void downloadFileError(const QString& messageId, const QString& path);
-    void uploadFileProgress(const QString& messageId, qreal value);
-    void uploadFileError(const QString& messageId, const QString& path);
-    void uploadFileComplete(const QString& messageId, const QString& url);
+    void loadFileProgress(const std::list<Shared::MessageInfo>& msgs, qreal value, bool up);
+    void loadFileError(const std::list<Shared::MessageInfo>& msgs, const QString& text, bool up);
+    void uploadFileComplete(const std::list<Shared::MessageInfo>& msgs, const QString& url);
+    void downloadFileComplete(const std::list<Shared::MessageInfo>& msgs, const QString& path);
     
 public slots:
-    void fileLocalPathRequest(const QString& messageId, const QString& url);
-    void downladFileRequest(const QString& messageId, const QString& url);
-    void uploadFileRequest(const QString& messageId, const QString& url, const QString& path);
+    void downladFile(const QString& url);
+    void registerFile(const QString& url, const QString& account, const QString& jid, const QString& id);
+    void registerFile(const QString& url, const QString& path, const QString& account, const QString& jid, const QString& id);
     
 private:
-    void startDownload(const QString& messageId, const QString& url);
-    void startUpload(const QString& messageId, const QString& url, const QString& path);
+    void startDownload(const std::list<Shared::MessageInfo>& msgs, const QString& url);
     QString getErrorText(QNetworkReply::NetworkError code);
+    QString prepareDirectory(const QString& jid);
+    QString checkFileName(const QString& name, const QString& path);
     
 private slots:
     void onDownloadProgress(qint64 bytesReceived, qint64 bytesTotal);
     void onDownloadError(QNetworkReply::NetworkError code);
+    void onDownloadSSLError(const QList<QSslError> &errors);
     void onDownloadFinished();
     void onUploadProgress(qint64 bytesReceived, qint64 bytesTotal);
     void onUploadError(QNetworkReply::NetworkError code);
@@ -80,12 +84,12 @@ private slots:
 private:
     bool running;
     QNetworkAccessManager* manager;
-    Storage files;
+    UrlStorage storage;
     std::map<QString, Transfer*> downloads;
     std::map<QString, Transfer*> uploads;
     
     struct Transfer {
-        std::set<QString> messages;
+        std::list<Shared::MessageInfo> messages;
         qreal progress;
         QNetworkReply* reply;
         bool success;

core/passwordStorageEngines/CMakeLists.txt

@@ -1,37 +1,9 @@
-cmake_minimum_required(VERSION 3.0)
-project(pse)
-
-if (WITH_KWALLET) 
-    set(CMAKE_AUTOMOC ON)
-
-    find_package(Qt5Core CONFIG REQUIRED)
-    find_package(Qt5Gui CONFIG REQUIRED)
-
-    get_target_property(KWALLET_INTERFACE_INCLUDE_DIRECTORIES KF5::Wallet INTERFACE_INCLUDE_DIRECTORIES)
-    get_target_property(Qt5GUI_INTERFACE_INCLUDE_DIRECTORIES Qt5::Gui INTERFACE_INCLUDE_DIRECTORIES)
-
-    set(kwalletPSE_SRC
-        kwallet.cpp
-    )
-    
-    add_library(kwalletPSE ${kwalletPSE_SRC})
-    
-    target_include_directories(kwalletPSE PUBLIC ${KWALLET_INTERFACE_INCLUDE_DIRECTORIES})
-    target_include_directories(kwalletPSE PUBLIC ${Qt5GUI_INTERFACE_INCLUDE_DIRECTORIES})
-
-    target_link_libraries(kwalletPSE Qt5::Core)
-
-    set(kwalletW_SRC
-        wrappers/kwallet.cpp
+if (WITH_KWALLET)
+  target_sources(squawk PRIVATE
+    kwallet.cpp
+    kwallet.h
     )
 
-    add_library(kwalletWrapper SHARED ${kwalletW_SRC})
-
-    target_include_directories(kwalletWrapper PUBLIC ${KWALLET_INTERFACE_INCLUDE_DIRECTORIES})
-    target_include_directories(kwalletWrapper PUBLIC ${Qt5GUI_INTERFACE_INCLUDE_DIRECTORIES})
-
-    target_link_libraries(kwalletWrapper KF5::Wallet)
-    target_link_libraries(kwalletWrapper Qt5::Core)
-
-    install(TARGETS kwalletWrapper DESTINATION ${CMAKE_INSTALL_LIBDIR})
-endif()
+  add_subdirectory(wrappers)
+  target_include_directories(squawk PRIVATE $<TARGET_PROPERTY:KF5::Wallet,INTERFACE_INCLUDE_DIRECTORIES>)
+endif ()

core/passwordStorageEngines/wrappers/CMakeLists.txt

@@ -0,0 +1,2 @@
+add_library(kwalletWrapper SHARED kwallet.cpp)
+target_link_libraries(kwalletWrapper PRIVATE KF5::Wallet)

core/rosteritem.cpp

@@ -122,7 +122,22 @@ void Core::RosterItem::nextRequest()
 {
     if (syncronizing) {
         if (requestedCount != -1) {
-            emit historyResponse(responseCache);
+            bool last = false;
+            if (archiveState == beginning || archiveState == complete) {
+                QString firstId = archive->oldestId();
+                if (responseCache.size() == 0) {
+                    if (requestedBefore == firstId) {
+                        last = true;
+                    }
+                } else {
+                    if (responseCache.front().getId() == firstId) {
+                        last = true;
+                    }
+                }
+            } else if (archiveState == empty && responseCache.size() == 0) {
+                last = true;
+            }
+            emit historyResponse(responseCache, last);
         }
     }
     if (requestCache.size() > 0) {
@@ -360,6 +375,11 @@ void Core::RosterItem::flushMessagesToArchive(bool finished, const QString& firs
                 archiveState = complete;
                 archive->setFromTheBeginning(true);
             }
+            if (added == 0 && wasEmpty) {
+                archiveState = empty;
+                nextRequest();
+                break;
+            }
             if (requestedCount != -1) {
                 QString before;
                 if (responseCache.size() > 0) {
@@ -378,7 +398,7 @@ void Core::RosterItem::flushMessagesToArchive(bool finished, const QString& firs
                 } catch (const Archive::Empty& e) {
                     
                 }
-                if (!found || requestedCount > responseCache.size()) {
+                if (!found || requestedCount > int(responseCache.size())) {
                     if (archiveState == complete) {
                         nextRequest();
                     } else {
@@ -529,7 +549,7 @@ void Core::RosterItem::clearArchiveRequests()
     requestedBefore = "";
     for (const std::pair<int, QString>& pair : requestCache) {
         if (pair.first != -1) {
-            emit historyResponse(responseCache);        //just to notify those who still waits with whatever happened to be left in caches yet
+            emit historyResponse(responseCache, false);        //just to notify those who still waits with whatever happened to be left in caches yet
         }
         responseCache.clear();
     }
@@ -549,3 +569,20 @@ void Core::RosterItem::downgradeDatabaseState()
         archiveState = ArchiveState::chunk;
     }
 }
+
+Shared::Message Core::RosterItem::getMessage(const QString& id)
+{
+    for (const Shared::Message& msg : appendCache) {
+        if (msg.getId() == id) {
+            return msg;
+        }
+    }
+    
+    for (Shared::Message& msg : hisoryCache) {
+        if (msg.getId() == id) {
+            return msg;
+        }
+    }
+    
+    return archive->getElement(id);
+}

core/rosteritem.h

@@ -78,10 +78,12 @@ public:
     void clearArchiveRequests();
     void downgradeDatabaseState();
     
+    Shared::Message getMessage(const QString& id);
+    
 signals:
     void nameChanged(const QString& name);
     void subscriptionStateChanged(Shared::SubscriptionState state);
-    void historyResponse(const std::list<Shared::Message>& messages);
+    void historyResponse(const std::list<Shared::Message>& messages, bool last);
     void needHistory(const QString& before, const QString& after, const QDateTime& afterTime = QDateTime());
     void avatarChanged(Shared::Avatar, const QString& path);
     void requestVCard(const QString& jid);

core/squawk.cpp

@@ -32,11 +32,10 @@ Core::Squawk::Squawk(QObject* parent):
     ,kwallet()
 #endif
 {
-    connect(&network, &NetworkAccess::fileLocalPathResponse, this, &Squawk::fileLocalPathResponse);
-    connect(&network, &NetworkAccess::downloadFileProgress, this, &Squawk::downloadFileProgress);
-    connect(&network, &NetworkAccess::downloadFileError, this, &Squawk::downloadFileError);
-    connect(&network, &NetworkAccess::uploadFileProgress, this, &Squawk::uploadFileProgress);
-    connect(&network, &NetworkAccess::uploadFileError, this, &Squawk::uploadFileError);
+    connect(&network, &NetworkAccess::loadFileProgress, this, &Squawk::fileProgress);
+    connect(&network, &NetworkAccess::loadFileError, this, &Squawk::fileError);
+    connect(&network, &NetworkAccess::downloadFileComplete, this, &Squawk::fileDownloadComplete);
+    connect(&network, &NetworkAccess::uploadFileComplete, this, &Squawk::fileUploadComplete);
     
 #ifdef WITH_KWALLET
     if (kwallet.supportState() == PSE::KWallet::success) {
@@ -168,7 +167,7 @@ void Core::Squawk::addAccount(
     
     connect(acc, &Account::receivedVCard, this, &Squawk::responseVCard);
     
-    connect(acc, &Account::uploadFileError, this, &Squawk::uploadFileError);
+    connect(acc, &Account::uploadFileError, this, &Squawk::onAccountUploadFileError);
     
     QMap<QString, QVariant> map = {
         {"login", login},
@@ -329,22 +328,22 @@ void Core::Squawk::sendMessage(const QString& account, const Shared::Message& da
 {
     AccountsMap::const_iterator itr = amap.find(account);
     if (itr == amap.end()) {
-        qDebug("An attempt to send a message with non existing account, skipping");
+        qDebug() << "An attempt to send a message with non existing account" << account << ", skipping";
         return;
     }
     
     itr->second->sendMessage(data);
 }
 
-void Core::Squawk::sendMessage(const QString& account, const Shared::Message& data, const QString& path)
+void Core::Squawk::resendMessage(const QString& account, const QString& jid, const QString& id)
 {
     AccountsMap::const_iterator itr = amap.find(account);
     if (itr == amap.end()) {
-        qDebug("An attempt to send a message with non existing account, skipping");
+        qDebug() << "An attempt to resend a message with non existing account" << account << ", skipping";
         return;
     }
     
-    itr->second->sendMessage(data, path);
+    itr->second->resendMessage(jid, id);
 }
 
 void Core::Squawk::requestArchive(const QString& account, const QString& jid, int count, const QString& before)
@@ -357,10 +356,10 @@ void Core::Squawk::requestArchive(const QString& account, const QString& jid, in
     itr->second->requestArchive(jid, count, before);
 }
 
-void Core::Squawk::onAccountResponseArchive(const QString& jid, const std::list<Shared::Message>& list)
+void Core::Squawk::onAccountResponseArchive(const QString& jid, const std::list<Shared::Message>& list, bool last)
 {
     Account* acc = static_cast<Account*>(sender());
-    emit responseArchive(acc->getName(), jid, list);
+    emit responseArchive(acc->getName(), jid, list, last);
 }
 
 void Core::Squawk::modifyAccountRequest(const QString& name, const QMap<QString, QVariant>& map)
@@ -604,14 +603,9 @@ void Core::Squawk::addRoomRequest(const QString& account, const QString& jid, co
     itr->second->addRoomRequest(jid, nick, password, autoJoin);
 }
 
-void Core::Squawk::fileLocalPathRequest(const QString& messageId, const QString& url)
+void Core::Squawk::fileDownloadRequest(const QString& url)
 {
-    network.fileLocalPathRequest(messageId, url);
-}
-
-void Core::Squawk::downloadFileRequest(const QString& messageId, const QString& url)
-{
-    network.downladFileRequest(messageId, url);
+    network.downladFile(url);
 }
 
 void Core::Squawk::addContactToGroupRequest(const QString& account, const QString& jid, const QString& groupName)
@@ -688,7 +682,7 @@ void Core::Squawk::readSettings()
             settings.value("login").toString(), 
             settings.value("server").toString(), 
             settings.value("password", "").toString(), 
-            settings.value("name").toString(), 
+            settings.value("name").toString(),
             settings.value("resource").toString(),
             Shared::Global::fromInt<Shared::AccountPassword>(settings.value("passwordType", static_cast<int>(Shared::AccountPassword::plain)).toInt())
         );
@@ -762,3 +756,26 @@ void Core::Squawk::onWalletResponsePassword(const QString& login, const QString&
     emit changeAccount(login, {{"password", password}});
     accountReady();
 }
+
+void Core::Squawk::onAccountUploadFileError(const QString& jid, const QString id, const QString& errorText)
+{
+    Account* acc = static_cast<Account*>(sender());
+    emit fileError({{acc->getName(), jid, id}}, errorText, true);
+}
+
+void Core::Squawk::onLocalPathInvalid(const QString& path)
+{
+    std::list<Shared::MessageInfo> list = network.reportPathInvalid(path);
+    
+    QMap<QString, QVariant> data({
+        {"attachPath", ""}
+    });
+    for (const Shared::MessageInfo& info : list) {
+        AccountsMap::const_iterator itr = amap.find(info.account);
+        if (itr != amap.end()) {
+            itr->second->requestChangeMessage(info.jid, info.messageId, data);
+        } else {
+            qDebug() << "Reacting on failure to reach file" << path << "there was an attempt to change message in account" << info.account << "which doesn't exist, skipping";
+        }
+    }
+}

core/squawk.h

@@ -51,31 +51,39 @@ public:
 signals:
     void quit();
     void ready();
+    
     void newAccount(const QMap<QString, QVariant>&);
     void changeAccount(const QString& account, const QMap<QString, QVariant>& data);
     void removeAccount(const QString& account);
+    
     void addGroup(const QString& account, const QString& name);
     void removeGroup(const QString& account, const QString& name);
+    
     void addContact(const QString& account, const QString& jid, const QString& group, const QMap<QString, QVariant>& data);
     void removeContact(const QString& account, const QString& jid);
     void removeContact(const QString& account, const QString& jid, const QString& group);
     void changeContact(const QString& account, const QString& jid, const QMap<QString, QVariant>& data);
+    
     void addPresence(const QString& account, const QString& jid, const QString& name, const QMap<QString, QVariant>& data);
     void removePresence(const QString& account, const QString& jid, const QString& name);
+    
     void stateChanged(Shared::Availability state);
+    
     void accountMessage(const QString& account, const Shared::Message& data);
-    void responseArchive(const QString& account, const QString& jid, const std::list<Shared::Message>& list);
+    void responseArchive(const QString& account, const QString& jid, const std::list<Shared::Message>& list, bool last);
+    
     void addRoom(const QString& account, const QString jid, const QMap<QString, QVariant>& data);
     void changeRoom(const QString& account, const QString jid, const QMap<QString, QVariant>& data);
     void removeRoom(const QString& account, const QString jid);
     void addRoomParticipant(const QString& account, const QString& jid, const QString& name, const QMap<QString, QVariant>& data);
     void changeRoomParticipant(const QString& account, const QString& jid, const QString& name, const QMap<QString, QVariant>& data);
     void removeRoomParticipant(const QString& account, const QString& jid, const QString& name);
-    void fileLocalPathResponse(const QString& messageId, const QString& path);
-    void downloadFileError(const QString& messageId, const QString& error);
-    void downloadFileProgress(const QString& messageId, qreal value);
-    void uploadFileError(const QString& messageId, const QString& error);
-    void uploadFileProgress(const QString& messageId, qreal value);
+    
+    void fileError(const std::list<Shared::MessageInfo> msgs, const QString& error, bool up);
+    void fileProgress(const std::list<Shared::MessageInfo> msgs, qreal value, bool up);
+    void fileDownloadComplete(const std::list<Shared::MessageInfo> msgs, const QString& path);
+    void fileUploadComplete(const std::list<Shared::MessageInfo> msgs, const QString& path);
+    
     void responseVCard(const QString& jid, const Shared::VCard& card);
     void changeMessage(const QString& account, const QString& jid, const QString& id, const QMap<QString, QVariant>& data);
     void requestPassword(const QString& account);
@@ -83,15 +91,19 @@ signals:
 public slots:
     void start();
     void stop();
+    
     void newAccountRequest(const QMap<QString, QVariant>& map);
     void modifyAccountRequest(const QString& name, const QMap<QString, QVariant>& map);
     void removeAccountRequest(const QString& name);
     void connectAccount(const QString& account);
     void disconnectAccount(const QString& account);
+    
     void changeState(Shared::Availability state);
+    
     void sendMessage(const QString& account, const Shared::Message& data);
-    void sendMessage(const QString& account, const Shared::Message& data, const QString& path);
+    void resendMessage(const QString& account, const QString& jid, const QString& id);
     void requestArchive(const QString& account, const QString& jid, int count, const QString& before);
+    
     void subscribeContact(const QString& account, const QString& jid, const QString& reason);
     void unsubscribeContact(const QString& account, const QString& jid, const QString& reason);
     void addContactToGroupRequest(const QString& account, const QString& jid, const QString& groupName);
@@ -99,15 +111,18 @@ public slots:
     void removeContactRequest(const QString& account, const QString& jid);
     void renameContactRequest(const QString& account, const QString& jid, const QString& newName);
     void addContactRequest(const QString& account, const QString& jid, const QString& name, const QSet<QString>& groups);
+    
     void setRoomJoined(const QString& account, const QString& jid, bool joined);
     void setRoomAutoJoin(const QString& account, const QString& jid, bool joined);
     void addRoomRequest(const QString& account, const QString& jid, const QString& nick, const QString& password, bool autoJoin);
     void removeRoomRequest(const QString& account, const QString& jid);
-    void fileLocalPathRequest(const QString& messageId, const QString& url);
-    void downloadFileRequest(const QString& messageId, const QString& url);
+    
+    void fileDownloadRequest(const QString& url);
+    
     void requestVCard(const QString& account, const QString& jid);
     void uploadVCard(const QString& account, const Shared::VCard& card);
     void responsePassword(const QString& account, const QString& password);
+    void onLocalPathInvalid(const QString& path);
     
 private:
     typedef std::deque<Account*> Accounts;
@@ -146,7 +161,7 @@ private slots:
     void onAccountAddPresence(const QString& jid, const QString& name, const QMap<QString, QVariant>& data);
     void onAccountRemovePresence(const QString& jid, const QString& name);
     void onAccountMessage(const Shared::Message& data);
-    void onAccountResponseArchive(const QString& jid, const std::list<Shared::Message>& list);
+    void onAccountResponseArchive(const QString& jid, const std::list<Shared::Message>& list, bool last);
     void onAccountAddRoom(const QString jid, const QMap<QString, QVariant>& data);
     void onAccountChangeRoom(const QString jid, const QMap<QString, QVariant>& data);
     void onAccountRemoveRoom(const QString jid);
@@ -155,6 +170,8 @@ private slots:
     void onAccountRemoveRoomPresence(const QString& jid, const QString& nick);
     void onAccountChangeMessage(const QString& jid, const QString& id, const QMap<QString, QVariant>& data);
     
+    void onAccountUploadFileError(const QString& jid, const QString id, const QString& errorText);
+    
     void onWalletOpened(bool success);
     void onWalletResponsePassword(const QString& login, const QString& password);
     void onWalletRejectPassword(const QString& login);

core/urlstorage.cpp

@@ -0,0 +1,491 @@
+/*
+ * Squawk messenger. 
+ * Copyright (C) 2019 Yury Gubich <blue@macaw.me>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <QStandardPaths>
+#include <QDir>
+#include <QDebug>
+
+#include "urlstorage.h"
+
+Core::UrlStorage::UrlStorage(const QString& p_name):
+    name(p_name),
+    opened(false),
+    environment(),
+    base(),
+    map()
+{
+}
+
+Core::UrlStorage::~UrlStorage()
+{
+    close();
+}
+
+void Core::UrlStorage::open()
+{
+    if (!opened) {
+        mdb_env_create(&environment);
+        QString path(QStandardPaths::writableLocation(QStandardPaths::CacheLocation));
+        path += "/" + name;
+        QDir cache(path);
+        
+        if (!cache.exists()) {
+            bool res = cache.mkpath(path);
+            if (!res) {
+                throw Archive::Directory(path.toStdString());
+            }
+        }
+        
+        mdb_env_set_maxdbs(environment, 2);
+        mdb_env_set_mapsize(environment, 10UL * 1024UL * 1024UL);
+        mdb_env_open(environment, path.toStdString().c_str(), 0, 0664);
+        
+        MDB_txn *txn;
+        mdb_txn_begin(environment, NULL, 0, &txn);
+        mdb_dbi_open(txn, "base", MDB_CREATE, &base);
+        mdb_dbi_open(txn, "map", MDB_CREATE, &map);
+        mdb_txn_commit(txn);
+        opened = true;
+    }
+}
+
+void Core::UrlStorage::close()
+{
+    if (opened) {
+        mdb_dbi_close(environment, map);
+        mdb_dbi_close(environment, base);
+        mdb_env_close(environment);
+        opened = false;
+    }
+}
+
+void Core::UrlStorage::writeInfo(const QString& key, const Core::UrlStorage::UrlInfo& info, bool overwrite)
+{
+    MDB_txn *txn;
+    mdb_txn_begin(environment, NULL, 0, &txn);
+    
+    try {
+        writeInfo(key, info, txn, overwrite);
+        mdb_txn_commit(txn);
+    } catch (...) {
+        mdb_txn_abort(txn);
+        throw;
+    }
+}
+
+void Core::UrlStorage::writeInfo(const QString& key, const Core::UrlStorage::UrlInfo& info, MDB_txn* txn, bool overwrite)
+{
+    QByteArray ba;
+    QDataStream ds(&ba, QIODevice::WriteOnly);
+    info.serialize(ds);
+    
+    const std::string& id = key.toStdString();
+    MDB_val lmdbKey, lmdbData;
+    lmdbKey.mv_size = id.size();
+    lmdbKey.mv_data = (char*)id.c_str();
+    lmdbData.mv_size = ba.size();
+    lmdbData.mv_data = (uint8_t*)ba.data();
+    
+    int rc;
+    rc = mdb_put(txn, base, &lmdbKey, &lmdbData, overwrite ? 0 : MDB_NOOVERWRITE);
+    
+    if (rc != 0) {
+        if (rc == MDB_KEYEXIST) {
+            if (!overwrite) {
+                throw Archive::Exist(name.toStdString(), id);
+            }
+        } else {
+            throw Archive::Unknown(name.toStdString(), mdb_strerror(rc));
+        }
+    }
+    
+    if (info.hasPath()) {
+        std::string sp = info.getPath().toStdString();
+        lmdbData.mv_size = sp.size();
+        lmdbData.mv_data = (char*)sp.c_str();
+        rc = mdb_put(txn, map, &lmdbData, &lmdbKey, 0);
+        if (rc != 0) {
+            throw Archive::Unknown(name.toStdString(), mdb_strerror(rc));
+        }
+    }
+}
+
+void Core::UrlStorage::readInfo(const QString& key, Core::UrlStorage::UrlInfo& info, MDB_txn* txn)
+{
+    const std::string& id = key.toStdString();
+    MDB_val lmdbKey, lmdbData;
+    lmdbKey.mv_size = id.size();
+    lmdbKey.mv_data = (char*)id.c_str();
+    int rc = mdb_get(txn, base, &lmdbKey, &lmdbData);
+    
+    if (rc == 0) {
+        QByteArray ba((char*)lmdbData.mv_data, lmdbData.mv_size);
+        QDataStream ds(&ba, QIODevice::ReadOnly);
+        
+        info.deserialize(ds);
+    } else if (rc == MDB_NOTFOUND) {
+        throw Archive::NotFound(id, name.toStdString());
+    } else {
+        throw Archive::Unknown(name.toStdString(), mdb_strerror(rc));
+    }
+}
+
+void Core::UrlStorage::readInfo(const QString& key, Core::UrlStorage::UrlInfo& info)
+{
+    MDB_txn *txn;
+    mdb_txn_begin(environment, NULL, MDB_RDONLY, &txn);
+    
+    try {
+        readInfo(key, info, txn);
+        mdb_txn_commit(txn);
+    } catch (...) {
+        mdb_txn_abort(txn);
+        throw;
+    }
+}
+
+void Core::UrlStorage::addFile(const QString& url)
+{
+    if (!opened) {
+        throw Archive::Closed("addFile(no message, no path)", name.toStdString());
+    }
+    
+    addToInfo(url, "", "", "");
+}
+
+void Core::UrlStorage::addFile(const QString& url, const QString& path)
+{
+    if (!opened) {
+        throw Archive::Closed("addFile(no message, with path)", name.toStdString());
+    }
+    
+    addToInfo(url, "", "", "", path);
+}
+
+void Core::UrlStorage::addFile(const QString& url, const QString& account, const QString& jid, const QString& id)
+{
+    if (!opened) {
+        throw Archive::Closed("addFile(with message, no path)", name.toStdString());
+    }
+    
+    addToInfo(url, account, jid, id);
+}
+
+void Core::UrlStorage::addFile(const QString& url, const QString& path, const QString& account, const QString& jid, const QString& id)
+{
+    if (!opened) {
+        throw Archive::Closed("addFile(with message, with path)", name.toStdString());
+    }
+    
+    addToInfo(url, account, jid, id, path);
+}
+
+void Core::UrlStorage::addFile(const std::list<Shared::MessageInfo>& msgs, const QString& url, const QString& path)
+{
+    if (!opened) {
+        throw Archive::Closed("addFile(with list)", name.toStdString());
+    }
+    
+    UrlInfo info (path, msgs);
+    writeInfo(url, info, true);;
+}
+
+QString Core::UrlStorage::addMessageAndCheckForPath(const QString& url, const QString& account, const QString& jid, const QString& id)
+{
+    if (!opened) {
+        throw Archive::Closed("addMessageAndCheckForPath", name.toStdString());
+    }
+    
+    return addToInfo(url, account, jid, id).getPath();
+}
+
+Core::UrlStorage::UrlInfo Core::UrlStorage::addToInfo(const QString& url, const QString& account, const QString& jid, const QString& id, const QString& path)
+{
+    UrlInfo info;
+    MDB_txn *txn;
+    mdb_txn_begin(environment, NULL, 0, &txn);
+    
+    try {
+        readInfo(url, info, txn);
+    } catch (const Archive::NotFound& e) {
+        
+    } catch (...) {
+        mdb_txn_abort(txn);
+        throw;
+    }
+    
+    bool pathChange = false;
+    bool listChange = false;
+    if (path != "-s") {
+        if (info.getPath() != path) {
+            info.setPath(path);
+            pathChange = true;
+        }
+    }
+    
+    if (account.size() > 0 && jid.size() > 0 && id.size() > 0) {
+        listChange = info.addMessage(account, jid, id);
+    }
+    
+    if (pathChange || listChange) {
+        try {
+            writeInfo(url, info, txn, true);
+            mdb_txn_commit(txn);
+        } catch (...) {
+            mdb_txn_abort(txn);
+            throw;
+        }
+    } else {
+        mdb_txn_abort(txn);
+    }
+    
+    return info;
+}
+
+std::list<Shared::MessageInfo> Core::UrlStorage::setPath(const QString& url, const QString& path)
+{
+    std::list<Shared::MessageInfo> list;
+    
+    MDB_txn *txn;
+    mdb_txn_begin(environment, NULL, 0, &txn);
+    UrlInfo info;
+    
+    try {
+        readInfo(url, info, txn);
+        info.getMessages(list);
+    } catch (const Archive::NotFound& e) {
+    } catch (...) {
+        mdb_txn_abort(txn);
+        throw;
+    }
+    
+    info.setPath(path);
+    try {
+        writeInfo(url, info, txn, true);
+        mdb_txn_commit(txn);
+    } catch (...) {
+        mdb_txn_abort(txn);
+        throw;
+    }
+    
+    return list;
+}
+
+std::list<Shared::MessageInfo> Core::UrlStorage::removeFile(const QString& url)
+{
+    std::list<Shared::MessageInfo> list;
+    
+    MDB_txn *txn;
+    mdb_txn_begin(environment, NULL, 0, &txn);
+    UrlInfo info;
+    
+    try {
+        std::string id = url.toStdString();
+        readInfo(url, info, txn);
+        info.getMessages(list);
+        
+        MDB_val lmdbKey;
+        lmdbKey.mv_size = id.size();
+        lmdbKey.mv_data = (char*)id.c_str();
+        int rc = mdb_del(txn, base, &lmdbKey, NULL);
+        if (rc != 0) {
+            throw Archive::Unknown(name.toStdString(), mdb_strerror(rc));
+        }
+        
+        if (info.hasPath()) {
+            std::string path = info.getPath().toStdString();
+            lmdbKey.mv_size = path.size();
+            lmdbKey.mv_data = (char*)path.c_str();
+            
+            int rc = mdb_del(txn, map, &lmdbKey, NULL);
+            if (rc != 0) {
+                throw Archive::Unknown(name.toStdString(), mdb_strerror(rc));
+            }
+        }
+        mdb_txn_commit(txn);
+    } catch (...) {
+        mdb_txn_abort(txn);
+        throw;
+    }
+    
+    return list;
+}
+
+std::list<Shared::MessageInfo> Core::UrlStorage::deletedFile(const QString& path)
+{
+    std::list<Shared::MessageInfo> list;
+    
+    MDB_txn *txn;
+    mdb_txn_begin(environment, NULL, 0, &txn);
+    
+    try {
+        std::string spath = path.toStdString();
+        
+        MDB_val lmdbKey, lmdbData;
+        lmdbKey.mv_size = spath.size();
+        lmdbKey.mv_data = (char*)spath.c_str();
+        
+        QString url;
+        int rc = mdb_get(txn, map, &lmdbKey, &lmdbData);
+        
+        if (rc == 0) {
+            std::string surl((char*)lmdbData.mv_data, lmdbData.mv_size);
+            url = QString(surl.c_str());
+        } else if (rc == MDB_NOTFOUND) {
+            qDebug() << "Have been asked to remove file" << path << ", which isn't in the database, skipping";
+            mdb_txn_abort(txn);
+            return list;
+        } else {
+            throw Archive::Unknown(name.toStdString(), mdb_strerror(rc));
+        }
+        
+        UrlInfo info;
+        std::string id = url.toStdString();
+        readInfo(url, info, txn);
+        info.getMessages(list);
+        info.setPath(QString());
+        writeInfo(url, info, txn, true);
+        
+        rc = mdb_del(txn, map, &lmdbKey, NULL);
+        if (rc != 0) {
+            throw Archive::Unknown(name.toStdString(), mdb_strerror(rc));
+        }
+        
+        mdb_txn_commit(txn);
+    } catch (...) {
+        mdb_txn_abort(txn);
+        throw;
+    }
+    
+    return list;
+}
+
+
+QString Core::UrlStorage::getUrl(const QString& path)
+{
+    std::list<Shared::MessageInfo> list;
+    
+    MDB_txn *txn;
+    mdb_txn_begin(environment, NULL, MDB_RDONLY, &txn);
+    
+    std::string spath = path.toStdString();
+    
+    MDB_val lmdbKey, lmdbData;
+    lmdbKey.mv_size = spath.size();
+    lmdbKey.mv_data = (char*)spath.c_str();
+    
+    QString url;
+    int rc = mdb_get(txn, map, &lmdbKey, &lmdbData);
+    
+    if (rc == 0) {
+        std::string surl((char*)lmdbData.mv_data, lmdbData.mv_size);
+        url = QString(surl.c_str());
+        
+        mdb_txn_abort(txn);
+        return url;
+    } else if (rc == MDB_NOTFOUND) {
+        mdb_txn_abort(txn);
+        throw Archive::NotFound(spath, name.toStdString());
+    } else {
+        mdb_txn_abort(txn);
+        throw Archive::Unknown(name.toStdString(), mdb_strerror(rc));
+    }
+}
+
+std::pair<QString, std::list<Shared::MessageInfo>> Core::UrlStorage::getPath(const QString& url)
+{
+    UrlInfo info;
+    readInfo(url, info);
+    std::list<Shared::MessageInfo> container;
+    info.getMessages(container);
+    return std::make_pair(info.getPath(), container);
+}
+
+Core::UrlStorage::UrlInfo::UrlInfo():
+    localPath(),
+    messages() {}
+
+Core::UrlStorage::UrlInfo::UrlInfo(const QString& path):
+    localPath(path),
+    messages() {}
+ 
+Core::UrlStorage::UrlInfo::UrlInfo(const QString& path, const std::list<Shared::MessageInfo>& msgs):
+    localPath(path),
+    messages(msgs) {}
+ 
+Core::UrlStorage::UrlInfo::~UrlInfo() {}
+ 
+bool Core::UrlStorage::UrlInfo::addMessage(const QString& acc, const QString& jid, const QString& id)
+{
+    for (const Shared::MessageInfo& info : messages) {
+        if (info.account == acc && info.jid == jid && info.messageId == id) {
+            return false;
+        }
+    }
+    messages.emplace_back(acc, jid, id);
+    return true;
+}
+
+void Core::UrlStorage::UrlInfo::serialize(QDataStream& data) const
+{
+    data << localPath;
+    std::list<Shared::MessageInfo>::size_type size = messages.size();
+    data << quint32(size);
+    for (const Shared::MessageInfo& info : messages) {
+        data << info.account;
+        data << info.jid;
+        data << info.messageId;
+    }
+}
+
+void Core::UrlStorage::UrlInfo::deserialize(QDataStream& data)
+{
+    data >> localPath;
+    quint32 size;
+    data >> size;
+    for (quint32 i = 0; i < size; ++i) {
+        messages.emplace_back();
+        Shared::MessageInfo& info = messages.back();
+        data >> info.account;
+        data >> info.jid;
+        data >> info.messageId;
+    }
+}
+
+void Core::UrlStorage::UrlInfo::getMessages(std::list<Shared::MessageInfo>& container) const
+{
+    for (const Shared::MessageInfo& info : messages) {
+        container.emplace_back(info);
+    }
+}
+
+QString Core::UrlStorage::UrlInfo::getPath() const
+{
+    return localPath;
+}
+
+bool Core::UrlStorage::UrlInfo::hasPath() const
+{
+    return localPath.size() > 0;
+}
+
+
+void Core::UrlStorage::UrlInfo::setPath(const QString& path)
+{
+    localPath = path;
+}

core/urlstorage.h

@@ -0,0 +1,99 @@
+/*
+ * Squawk messenger. 
+ * Copyright (C) 2019 Yury Gubich <blue@macaw.me>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef CORE_URLSTORAGE_H
+#define CORE_URLSTORAGE_H
+
+#include <QString>
+#include <QDataStream>
+#include <lmdb.h>
+#include <list>
+
+#include "archive.h"
+#include <shared/messageinfo.h>
+
+namespace Core {
+
+/**
+ * @todo write docs
+ */
+class UrlStorage
+{
+    class UrlInfo;
+public:
+    UrlStorage(const QString& name);
+    ~UrlStorage();
+    
+    void open();
+    void close();
+    
+    void addFile(const QString& url);
+    void addFile(const QString& url, const QString& path);
+    void addFile(const QString& url, const QString& account, const QString& jid, const QString& id);
+    void addFile(const QString& url, const QString& path, const QString& account, const QString& jid, const QString& id);
+    void addFile(const std::list<Shared::MessageInfo>& msgs, const QString& url, const QString& path);      //this one overwrites all that was
+    std::list<Shared::MessageInfo> removeFile(const QString& url);      //removes entry like it never was in the database, returns affected message infos
+    std::list<Shared::MessageInfo> deletedFile(const QString& path);    //empties the localPath of the entry, returns affected message infos
+    std::list<Shared::MessageInfo> setPath(const QString& url, const QString& path);
+    QString getUrl(const QString& path);
+    QString addMessageAndCheckForPath(const QString& url, const QString& account, const QString& jid, const QString& id);
+    std::pair<QString, std::list<Shared::MessageInfo>> getPath(const QString& url);
+    
+private:
+    QString name;
+    bool opened;
+    MDB_env* environment;
+    MDB_dbi base;
+    MDB_dbi map;
+    
+private:
+    void writeInfo(const QString& key, const UrlInfo& info, bool overwrite = false);
+    void writeInfo(const QString& key, const UrlInfo& info, MDB_txn* txn, bool overwrite = false);
+    void readInfo(const QString& key, UrlInfo& info);
+    void readInfo(const QString& key, UrlInfo& info, MDB_txn* txn);
+    UrlInfo addToInfo(const QString& url, const QString& account, const QString& jid, const QString& id, const QString& path = "-s");
+    
+private:
+    class UrlInfo {
+    public:
+        UrlInfo(const QString& path);
+        UrlInfo(const QString& path, const std::list<Shared::MessageInfo>& msgs);
+        UrlInfo();
+        ~UrlInfo();
+        
+        void serialize(QDataStream& data) const;
+        void deserialize(QDataStream& data);
+        
+        QString getPath() const;
+        bool hasPath() const;
+        void setPath(const QString& path);
+        
+        bool addMessage(const QString& acc, const QString& jid, const QString& id);
+        void getMessages(std::list<Shared::MessageInfo>& container) const;
+        
+    private:
+        QString localPath;
+        std::list<Shared::MessageInfo> messages;
+    };
+    
+    
+};
+
+}
+
+#endif // CORE_URLSTORAGE_H

external/simpleCrypt/CMakeLists.txt

@@ -1,16 +1,10 @@
 cmake_minimum_required(VERSION 3.0)
-project(simplecrypt)
+project(simplecrypt LANGUAGES CXX)
 
 set(CMAKE_AUTOMOC ON)
 
-find_package(Qt5Core CONFIG REQUIRED)
+find_package(Qt5 COMPONENTS Core REQUIRED)
 
-set(simplecrypt_SRC
-    simplecrypt.cpp
-)
+add_library(simpleCrypt STATIC simplecrypt.cpp simplecrypt.h)
 
-# Tell CMake to create the helloworld executable
-add_library(simpleCrypt ${simplecrypt_SRC})
-
-# Use the Widgets module from Qt 5.
 target_link_libraries(simpleCrypt Qt5::Core)

packaging/CMakeLists.txt

@@ -0,0 +1,3 @@
+configure_file(squawk.desktop squawk.desktop COPYONLY)
+
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/squawk.desktop DESTINATION ${CMAKE_INSTALL_DATADIR}/applications)

plugins/CMakeLists.txt

@@ -0,0 +1,4 @@
+if (WITH_KIO)
+  add_library(openFileManagerWindowJob SHARED openfilemanagerwindowjob.cpp)
+  target_link_libraries(openFileManagerWindowJob PRIVATE KF5::KIOWidgets)
+endif ()

plugins/openfilemanagerwindowjob.cpp

@@ -0,0 +1,8 @@
+#include <QUrl>
+#include <QObject>
+#include <KIO/OpenFileManagerWindowJob>
+
+extern "C" void highlightInFileManager(const QUrl& url) {
+    KIO::OpenFileManagerWindowJob* job = KIO::highlightInFileManager({url});
+    QObject::connect(job, &KIO::OpenFileManagerWindowJob::result, job, &KIO::OpenFileManagerWindowJob::deleteLater);
+}

resources/CMakeLists.txt

@@ -0,0 +1,14 @@
+target_sources(squawk PRIVATE resources.qrc)
+
+configure_file(images/logo.svg squawk.svg COPYONLY)
+
+execute_process(COMMAND convert -background none -size 48x48 squawk.svg squawk48.png WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
+execute_process(COMMAND convert -background none -size 64x64 squawk.svg squawk64.png WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
+execute_process(COMMAND convert -background none -size 128x128 squawk.svg squawk128.png WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
+execute_process(COMMAND convert -background none -size 256x256 squawk.svg squawk256.png WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
+
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/squawk.svg DESTINATION ${CMAKE_INSTALL_DATADIR}/icons/hicolor/scalable/apps)
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/squawk48.png DESTINATION ${CMAKE_INSTALL_DATADIR}/icons/hicolor/48x48/apps RENAME squawk.png)
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/squawk64.png DESTINATION ${CMAKE_INSTALL_DATADIR}/icons/hicolor/64x64/apps RENAME squawk.png)
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/squawk128.png DESTINATION ${CMAKE_INSTALL_DATADIR}/icons/hicolor/128x128/apps RENAME squawk.png)
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/squawk256.png DESTINATION ${CMAKE_INSTALL_DATADIR}/icons/hicolor/256x256/apps RENAME squawk.png)

resources/images/fallback/dark/big/document-preview.svg

@@ -0,0 +1,11 @@
+<!DOCTYPE svg>
+<svg viewBox="0 0 22 22" version="1.1" xmlns="http://www.w3.org/2000/svg">
+    <defs>
+        <style type="text/css" id="current-color-scheme">
+            .ColorScheme-Text {
+                color:#232629;
+            }
+        </style>
+    </defs>
+    <path class="ColorScheme-Text" style="fill:currentColor; fill-opacity:1; stroke:none" d="M 4 3 L 4 19 L 15 19 L 15 18 L 5 18 L 5 4 L 13 4 L 13 8 L 17 8 L 17 16 L 18 16 L 18 7 L 14 3 L 4 3 Z M 13 11 C 11.338 11 10 12.338 10 14 C 10 15.662 11.338 17 13 17 C 13.6494 17 14.2464 16.7914 14.7363 16.4434 L 17.293 19 L 18 18.293 L 15.4434 15.7363 C 15.7914 15.2464 16 14.6494 16 14 C 16 12.338 14.662 11 13 11 Z M 13 12 C 14.108 12 15 12.892 15 14 C 15 15.108 14.108 16 13 16 C 11.892 16 11 15.108 11 14 C 11 12.892 11.892 12 13 12 Z"/>
+</svg>

resources/images/fallback/dark/big/folder.svg

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+<svg width="32" version="1.1" xmlns="http://www.w3.org/2000/svg" height="32" viewBox="0 0 32 32" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape">
+ <defs id="defs5455">
+  <linearGradient inkscape:collect="always" id="linearGradient4172-5">
+   <stop style="stop-color:#3daee9" id="stop4174-6"/>
+   <stop offset="1" style="stop-color:#6cc1ef" id="stop4176-6"/>
+  </linearGradient>
+  <linearGradient inkscape:collect="always" xlink:href="#linearGradient4172-5" id="linearGradient4342" y1="29" y2="8" x2="0" gradientUnits="userSpaceOnUse"/>
+ </defs>
+ <metadata id="metadata5458"/>
+ <g inkscape:label="Capa 1" inkscape:groupmode="layer" id="layer1" transform="matrix(1 0 0 1 -384.57143 -515.798)">
+  <path inkscape:connector-curvature="0" style="fill:#147eb8;fill-rule:evenodd" id="path4308" d="m 386.57144,518.798 0,7 0,1 28,0 0,-6 -14.00001,0 -2,-2 z"/>
+  <path inkscape:connector-curvature="0" style="fill-opacity:0.235294;fill-rule:evenodd" id="path4306" d="m 397.57143,523.798 -1.99999,1 -9,0 0,1 6.99999,0 3,0 z"/>
+  <path style="fill:url(#linearGradient4342)" id="rect4294" d="M 13 8 L 11 10 L 2 10 L 1 10 L 1 29 L 12 29 L 13 29 L 31 29 L 31 8 L 13 8 z " transform="matrix(1 0 0 1 384.57143 515.798)"/>
+  <path inkscape:connector-curvature="0" style="fill:#ffffff;fill-opacity:0.235294;fill-rule:evenodd" id="path4304" d="m 397.57143,523.798 -2,2 -10,0 0,1 11,0 z"/>
+  <path inkscape:connector-curvature="0" style="fill:#ffffff;fill-opacity:0.235294;fill-rule:evenodd" id="path4310" d="m 398.57143,518.798 1,3 15.00001,0 0,-1 -14.00001,0 z"/>
+  <rect width="30" x="385.57144" y="543.79797" height="1" style="fill-opacity:0.235294" id="rect4292"/>
+ </g>
+</svg>

resources/images/fallback/dark/small/document-preview.svg

@@ -0,0 +1,12 @@
+<!DOCTYPE svg>
+<svg viewBox="0 0 16 16" version="1.1" xmlns="http://www.w3.org/2000/svg">
+    <defs>
+        <style type="text/css" id="current-color-scheme">
+            .ColorScheme-Text {
+                color:#232629;
+            }
+        </style>
+    </defs>
+    <path class="ColorScheme-Text" style="fill:currentColor; fill-opacity:1; stroke:none" d="M 3 2 L 3 14 L 10 14 L 10 13 L 4 13 L 4 3 L 9 3 L 9 6 L 12 6 L 12 11 L 13 11 L 13 5 L 10 2 L 3 2 Z"/>
+    <path class="ColorScheme-Text" style="fill:currentColor; fill-opacity:1; stroke:none" d="M 8.48828 7 C 7.10757 7 5.98828 8.11929 5.98828 9.5 C 5.98828 10.8807 7.10757 12 8.48828 12 C 8.97811 11.9992 9.45691 11.8546 9.86523 11.584 L 12.2813 14 L 12.9883 13.293 L 10.5723 10.877 C 10.8428 10.4686 10.9875 9.98983 10.9883 9.5 C 10.9883 8.11929 9.86899 7 8.48828 7 Z M 8.48828 8 C 9.31671 8 9.98828 8.67157 9.98828 9.5 C 9.98828 10.3284 9.31671 11 8.48828 11 C 7.65985 11 6.98828 10.3284 6.98828 9.5 C 6.98828 8.67157 7.65985 8 8.48828 8 Z"/>
+</svg>

resources/images/fallback/dark/small/folder.svg

@@ -0,0 +1,13 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16">
+  <defs id="defs3051">
+    <style type="text/css" id="current-color-scheme">
+      .ColorScheme-Text {
+        color:#232629;
+      }
+      </style>
+  </defs>
+ <path style="fill:currentColor;fill-opacity:1;stroke:none" 
+       d="M 2 2 L 2 3 L 2 6 L 2 7 L 2 13 L 2 14 L 14 14 L 14 13 L 14 6 L 14 5 L 14 4 L 9.0078125 4 L 7.0078125 2 L 7 2.0078125 L 7 2 L 3 2 L 2 2 z M 3 3 L 6.5917969 3 L 7.59375 4 L 7 4 L 7 4.0078125 L 6.9921875 4 L 4.9921875 6 L 3 6 L 3 3 z M 3 7 L 13 7 L 13 13 L 3 13 L 3 7 z "
+       class="ColorScheme-Text"
+       />
+</svg>

resources/images/fallback/light/big/document-preview.svg

@@ -0,0 +1,11 @@
+<!DOCTYPE svg>
+<svg viewBox="0 0 22 22" version="1.1" xmlns="http://www.w3.org/2000/svg">
+    <defs>
+        <style type="text/css" id="current-color-scheme">
+            .ColorScheme-Text {
+                color:#eff0f1;
+            }
+        </style>
+    </defs>
+    <path class="ColorScheme-Text" style="fill:currentColor; fill-opacity:1; stroke:none" d="M 4 3 L 4 19 L 15 19 L 15 18 L 5 18 L 5 4 L 13 4 L 13 8 L 17 8 L 17 16 L 18 16 L 18 7 L 14 3 L 4 3 Z M 13 11 C 11.338 11 10 12.338 10 14 C 10 15.662 11.338 17 13 17 C 13.6494 17 14.2464 16.7914 14.7363 16.4434 L 17.293 19 L 18 18.293 L 15.4434 15.7363 C 15.7914 15.2464 16 14.6494 16 14 C 16 12.338 14.662 11 13 11 Z M 13 12 C 14.108 12 15 12.892 15 14 C 15 15.108 14.108 16 13 16 C 11.892 16 11 15.108 11 14 C 11 12.892 11.892 12 13 12 Z"/>
+</svg>

resources/images/fallback/light/big/folder.svg

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+<svg width="32" version="1.1" xmlns="http://www.w3.org/2000/svg" height="32" viewBox="0 0 32 32" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape">
+ <defs id="defs5455">
+  <linearGradient inkscape:collect="always" id="linearGradient4172-5">
+   <stop style="stop-color:#3daee9" id="stop4174-6"/>
+   <stop offset="1" style="stop-color:#6cc1ef" id="stop4176-6"/>
+  </linearGradient>
+  <linearGradient inkscape:collect="always" xlink:href="#linearGradient4172-5" id="linearGradient4342" y1="29" y2="8" x2="0" gradientUnits="userSpaceOnUse"/>
+ </defs>
+ <metadata id="metadata5458"/>
+ <g inkscape:label="Capa 1" inkscape:groupmode="layer" id="layer1" transform="matrix(1 0 0 1 -384.57143 -515.798)">
+  <path inkscape:connector-curvature="0" style="fill:#147eb8;fill-rule:evenodd" id="path4308" d="m 386.57144,518.798 0,7 0,1 28,0 0,-6 -14.00001,0 -2,-2 z"/>
+  <path inkscape:connector-curvature="0" style="fill-opacity:0.235294;fill-rule:evenodd" id="path4306" d="m 397.57143,523.798 -1.99999,1 -9,0 0,1 6.99999,0 3,0 z"/>
+  <path style="fill:url(#linearGradient4342)" id="rect4294" d="M 13 8 L 11 10 L 2 10 L 1 10 L 1 29 L 12 29 L 13 29 L 31 29 L 31 8 L 13 8 z " transform="matrix(1 0 0 1 384.57143 515.798)"/>
+  <path inkscape:connector-curvature="0" style="fill:#ffffff;fill-opacity:0.235294;fill-rule:evenodd" id="path4304" d="m 397.57143,523.798 -2,2 -10,0 0,1 11,0 z"/>
+  <path inkscape:connector-curvature="0" style="fill:#ffffff;fill-opacity:0.235294;fill-rule:evenodd" id="path4310" d="m 398.57143,518.798 1,3 15.00001,0 0,-1 -14.00001,0 z"/>
+  <rect width="30" x="385.57144" y="543.79797" height="1" style="fill-opacity:0.235294" id="rect4292"/>
+ </g>
+</svg>

resources/images/fallback/light/small/document-preview.svg

@@ -0,0 +1,12 @@
+<!DOCTYPE svg>
+<svg viewBox="0 0 16 16" version="1.1" xmlns="http://www.w3.org/2000/svg">
+    <defs>
+        <style type="text/css" id="current-color-scheme">
+            .ColorScheme-Text {
+                color:#eff0f1;
+            }
+        </style>
+    </defs>
+    <path class="ColorScheme-Text" style="fill:currentColor; fill-opacity:1; stroke:none" d="M 3 2 L 3 14 L 10 14 L 10 13 L 4 13 L 4 3 L 9 3 L 9 6 L 12 6 L 12 11 L 13 11 L 13 5 L 10 2 L 3 2 Z"/>
+    <path class="ColorScheme-Text" style="fill:currentColor; fill-opacity:1; stroke:none" d="M 8.48828 7 C 7.10757 7 5.98828 8.11929 5.98828 9.5 C 5.98828 10.8807 7.10757 12 8.48828 12 C 8.97811 11.9992 9.45691 11.8546 9.86523 11.584 L 12.2813 14 L 12.9883 13.293 L 10.5723 10.877 C 10.8428 10.4686 10.9875 9.98983 10.9883 9.5 C 10.9883 8.11929 9.86899 7 8.48828 7 Z M 8.48828 8 C 9.31671 8 9.98828 8.67157 9.98828 9.5 C 9.98828 10.3284 9.31671 11 8.48828 11 C 7.65985 11 6.98828 10.3284 6.98828 9.5 C 6.98828 8.67157 7.65985 8 8.48828 8 Z"/>
+</svg>

resources/images/fallback/light/small/folder.svg

@@ -0,0 +1,13 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16">
+  <defs id="defs3051">
+    <style type="text/css" id="current-color-scheme">
+      .ColorScheme-Text {
+        color:#eff0f1;
+      }
+      </style>
+  </defs>
+ <path style="fill:currentColor;fill-opacity:1;stroke:none" 
+       d="M 2 2 L 2 3 L 2 6 L 2 7 L 2 13 L 2 14 L 14 14 L 14 13 L 14 6 L 14 5 L 14 4 L 9.0078125 4 L 7.0078125 2 L 7 2.0078125 L 7 2 L 3 2 L 2 2 z M 3 3 L 6.5917969 3 L 7.59375 4 L 7 4 L 7 4.0078125 L 6.9921875 4 L 4.9921875 6 L 3 6 L 3 3 z M 3 7 L 13 7 L 13 13 L 3 13 L 3 7 z "
+       class="ColorScheme-Text"
+       />
+</svg>

resources/resources.qrc

@@ -40,6 +40,8 @@
     <file>images/fallback/dark/big/favorite.svg</file>
     <file>images/fallback/dark/big/unfavorite.svg</file>
     <file>images/fallback/dark/big/add.svg</file>
+    <file>images/fallback/dark/big/folder.svg</file>
+    <file>images/fallback/dark/big/document-preview.svg</file>
     
     
     <file>images/fallback/dark/small/absent.svg</file>
@@ -80,6 +82,8 @@
     <file>images/fallback/dark/small/favorite.svg</file>
     <file>images/fallback/dark/small/unfavorite.svg</file>
     <file>images/fallback/dark/small/add.svg</file>
+    <file>images/fallback/dark/small/folder.svg</file>
+    <file>images/fallback/dark/small/document-preview.svg</file>
     
     
     <file>images/fallback/light/big/absent.svg</file>
@@ -120,6 +124,8 @@
     <file>images/fallback/light/big/favorite.svg</file>
     <file>images/fallback/light/big/unfavorite.svg</file>
     <file>images/fallback/light/big/add.svg</file>
+    <file>images/fallback/light/big/folder.svg</file>
+    <file>images/fallback/light/big/document-preview.svg</file>
     
     
     <file>images/fallback/light/small/absent.svg</file>
@@ -160,5 +166,7 @@
     <file>images/fallback/light/small/favorite.svg</file>
     <file>images/fallback/light/small/unfavorite.svg</file>
     <file>images/fallback/light/small/add.svg</file>
+    <file>images/fallback/light/small/folder.svg</file>
+    <file>images/fallback/light/small/document-preview.svg</file>
 </qresource>
 </RCC>

shared/CMakeLists.txt

@@ -0,0 +1,19 @@
+target_sources(squawk PRIVATE
+  enums.h
+  global.cpp
+  global.h
+  exception.cpp
+  exception.h
+  icons.cpp
+  icons.h
+  message.cpp
+  message.h
+  messageinfo.cpp
+  messageinfo.h
+  order.h
+  shared.h
+  utils.cpp
+  utils.h
+  vcard.cpp
+  vcard.h
+  )

shared/global.cpp

@@ -23,6 +23,11 @@
 Shared::Global* Shared::Global::instance = 0;
 const std::set<QString> Shared::Global::supportedImagesExts = {"png", "jpg", "webp", "jpeg", "gif", "svg"};
 
+#ifdef WITH_KIO
+QLibrary Shared::Global::openFileManagerWindowJob("openFileManagerWindowJob");
+Shared::Global::HighlightInFileManager Shared::Global::hfm = 0;
+#endif
+
 Shared::Global::Global():
     availability({
         tr("Online", "Availability"), 
@@ -80,16 +85,72 @@ Shared::Global::Global():
         tr("Your password is going to be stored in KDE wallet storage (KWallet). You're going to be queried for permissions", "AccountPasswordDescription")
     }),
     pluginSupport({
-        {"KWallet", false}
-    })
+        {"KWallet", false},
+        {"openFileManagerWindowJob", false}
+    }),
+    fileCache()
 {
     if (instance != 0) {
         throw 551;
     }
     
     instance = this;
+    
+#ifdef WITH_KIO
+    openFileManagerWindowJob.load();
+    if (openFileManagerWindowJob.isLoaded()) {
+        hfm = (HighlightInFileManager) openFileManagerWindowJob.resolve("highlightInFileManager");
+        if (hfm) {
+            setSupported("openFileManagerWindowJob", true);
+            qDebug() << "KIO::OpenFileManagerWindow support enabled";
+        } else {
+            qDebug() << "KIO::OpenFileManagerWindow support disabled: couldn't resolve required methods in the library";
+        }
+    } else {
+        qDebug() << "KIO::OpenFileManagerWindow support disabled: couldn't load the library" << openFileManagerWindowJob.errorString();
+    }
+#endif
 }
 
+
+static const QSize defaultIconFileInfoHeight(50, 50);
+Shared::Global::FileInfo Shared::Global::getFileInfo(const QString& path)
+{
+    std::map<QString, FileInfo>::const_iterator itr = instance->fileCache.find(path);
+    if (itr == instance->fileCache.end()) {
+        QMimeDatabase db;
+        QMimeType type = db.mimeTypeForFile(path);
+        QStringList parts = type.name().split("/");
+        QString big = parts.front();
+        QFileInfo info(path);
+        
+        FileInfo::Preview p = FileInfo::Preview::none;
+        QSize size;
+        if (big == "image") {
+            QMovie mov(path);
+            if (mov.isValid() && mov.frameCount() > 1) {
+                p = FileInfo::Preview::animation;
+            } else {
+                p = FileInfo::Preview::picture;
+            }
+            QImageReader img(path);
+            size = img.size();
+//         } else if (big == "video") {
+//             p = FileInfo::Preview::movie;
+//             QMovie mov(path);
+//             size = mov.scaledSize();
+//             qDebug() << mov.isValid();
+        } else {
+            size = defaultIconFileInfoHeight;
+        }
+        
+        itr = instance->fileCache.insert(std::make_pair(path, FileInfo({info.fileName(), size, type, p}))).first;
+    } 
+    
+    return itr->second;
+}
+
+
 Shared::Global * Shared::Global::getInstance()
 {
     return instance;
@@ -152,6 +213,69 @@ QString Shared::Global::getDescription(Shared::AccountPassword ap)
     return instance->accountPasswordDescription[static_cast<int>(ap)];
 }
 
+
+static const QStringList query = {"query", "default", "inode/directory"};
+static const QRegularExpression dolphinReg("[Dd]olphin");
+static const QRegularExpression nautilusReg("[Nn]autilus");
+static const QRegularExpression cajaReg("[Cc]aja");
+static const QRegularExpression nemoReg("[Nn]emo");
+static const QRegularExpression konquerorReg("kfmclient");
+static const QRegularExpression pcmanfmQtReg("pcmanfm-qt");
+static const QRegularExpression pcmanfmReg("pcmanfm");
+static const QRegularExpression thunarReg("thunar");
+
+void Shared::Global::highlightInFileManager(const QString& path)
+{
+#ifdef WITH_KIO
+    if (supported("openFileManagerWindowJob")) {
+        hfm(path);
+        return;
+    } else {
+        qDebug() << "requested to highlight in file manager url" << path << "but it's not supported: KIO plugin isn't loaded, trying fallback";
+    }
+#else
+    qDebug() << "requested to highlight in file manager url" << path << "but it's not supported: squawk wasn't compiled to support it, trying fallback";
+#endif
+    
+    QFileInfo info = path;
+    if (info.exists()) {
+        QProcess proc;
+        proc.start("xdg-mime", query);
+        proc.waitForFinished();
+        QString output = proc.readLine().simplified();
+        
+        QString folder;
+        if (info.isDir()) {
+            folder = info.canonicalFilePath();
+        } else {
+            folder = info.canonicalPath();
+        }
+        
+        if (output.contains(dolphinReg)) {
+            //there is a bug on current (21.04.0) dolphin, it works correct only if you already have dolphin launched
+            proc.startDetached("dolphin", QStringList() << "--select" << info.canonicalFilePath());
+            //KIO::highlightInFileManager({QUrl(info.canonicalFilePath())});
+        } else if (output.contains(nautilusReg)) {
+            proc.startDetached("nautilus", QStringList() << "--select" << info.canonicalFilePath());    //this worked on nautilus
+        } else if (output.contains(cajaReg)) {
+            proc.startDetached("caja", QStringList() << folder);  //caja doesn't seem to support file selection command line, gonna just open directory
+        } else if (output.contains(nemoReg)) {
+            proc.startDetached("nemo", QStringList() << info.canonicalFilePath());      //nemo supports selecting files without keys
+        } else if (output.contains(konquerorReg)) {
+            proc.startDetached("konqueror", QStringList() << "--select" << info.canonicalFilePath());   //this worked on konqueror
+        } else if (output.contains(pcmanfmQtReg)) {
+            proc.startDetached("pcmanfm-qt", QStringList() << folder);   //pcmanfm-qt doesn't seem to support open with selection, gonna just open directory
+        } else if (output.contains(pcmanfmReg)) {
+            proc.startDetached("pcmanfm", QStringList() << folder);   //pcmanfm also doesn't seem to support open with selection, gonna just open directory
+        } else if (output.contains(thunarReg)) {
+            proc.startDetached("thunar", QStringList() << folder);   //thunar doesn't seem to support open with selection, gonna just open directory
+        } else {
+            QDesktopServices::openUrl(QUrl::fromLocalFile(folder));
+        }
+    }
+}
+
+
 #define FROM_INT_INPL(Enum)                                                                 \
 template<>                                                                                  \
 Enum Shared::Global::fromInt(int src)                                                       \

shared/global.h

@@ -29,6 +29,18 @@
 
 #include <QCoreApplication>
 #include <QDebug>
+#include <QMimeType>
+#include <QMimeDatabase>
+#include <QFileInfo>
+#include <QImage>
+#include <QMovie>
+#include <QSize>
+#include <QUrl>
+#include <QLibrary>
+#include <QFileInfo>
+#include <QProcess>
+#include <QDesktopServices>
+#include <QRegularExpression>
 
 namespace Shared {
     
@@ -36,6 +48,19 @@ namespace Shared {
         Q_DECLARE_TR_FUNCTIONS(Global)
         
     public:
+        struct FileInfo {
+            enum class Preview {
+                none,
+                picture,
+                animation
+            };
+            
+            QString name;
+            QSize size;
+            QMimeType mime;
+            Preview preview;
+        };
+        
         Global();
         
         static Global* getInstance();
@@ -64,6 +89,9 @@ namespace Shared {
         
         static const std::set<QString> supportedImagesExts;
         
+        static FileInfo getFileInfo(const QString& path);
+        static void highlightInFileManager(const QString& path);
+        
         template<typename T>
         static T fromInt(int src);
         
@@ -87,6 +115,15 @@ namespace Shared {
         static Global* instance;
         
         std::map<QString, bool> pluginSupport;
+        std::map<QString, FileInfo> fileCache;
+        
+#ifdef WITH_KIO
+        static QLibrary openFileManagerWindowJob;
+        
+        typedef void (*HighlightInFileManager)(const QUrl &);
+        
+        static HighlightInFileManager hfm;
+#endif
     };
 }
 

shared/icons.h

@@ -170,6 +170,8 @@ static const std::map<QString, std::pair<QString, QString>> icons = {
     {"favorite", {"favorite", "favorite"}},
     {"unfavorite", {"draw-star", "unfavorite"}},
     {"list-add", {"list-add", "add"}},
+    {"folder", {"folder", "folder"}},
+    {"document-preview", {"document-preview", "document-preview"}}
 };
 }
 

shared/message.cpp

@@ -36,7 +36,8 @@ Shared::Message::Message(Shared::Message::Type p_type):
     errorText(),
     originalMessage(),
     lastModified(),
-    stanzaId()
+    stanzaId(),
+    attachPath()
     {}
 
 Shared::Message::Message():
@@ -56,7 +57,8 @@ Shared::Message::Message():
     errorText(),
     originalMessage(),
     lastModified(),
-    stanzaId()
+    stanzaId(),
+    attachPath()
     {}
 
 QString Shared::Message::getBody() const
@@ -311,6 +313,7 @@ void Shared::Message::serialize(QDataStream& data) const
         data << lastModified;
     }
     data << stanzaId;
+    data << attachPath;
 }
 
 void Shared::Message::deserialize(QDataStream& data)
@@ -341,6 +344,7 @@ void Shared::Message::deserialize(QDataStream& data)
         data >> lastModified;
     }
     data >> stanzaId;
+    data >> attachPath;
 }
 
 bool Shared::Message::change(const QMap<QString, QVariant>& data)
@@ -350,6 +354,16 @@ bool Shared::Message::change(const QMap<QString, QVariant>& data)
         setState(static_cast<State>(itr.value().toUInt()));
     }
     
+    itr = data.find("outOfBandUrl");
+    if (itr != data.end()) {
+        setOutOfBandUrl(itr.value().toString());
+    }
+    
+    itr = data.find("attachPath");
+    if (itr != data.end()) {
+        setAttachPath(itr.value().toString());
+    }
+    
     if (state == State::error) {
         itr = data.find("errorText");
         if (itr != data.end()) {
@@ -380,18 +394,29 @@ bool Shared::Message::change(const QMap<QString, QVariant>& data)
     
     itr = data.find("body");
     if (itr != data.end()) {
-        QMap<QString, QVariant>::const_iterator dItr = data.find("stamp");
-        QDateTime correctionDate;
-        if (dItr != data.end()) {
-            correctionDate = dItr.value().toDateTime();
-        } else {
-            correctionDate = QDateTime::currentDateTimeUtc();      //in case there is no information about time of this correction it's applied
+        QString b = itr.value().toString();
+        if (body != b) {
+            QMap<QString, QVariant>::const_iterator dItr = data.find("stamp");
+            QDateTime correctionDate;
+            if (dItr != data.end()) {
+                correctionDate = dItr.value().toDateTime();
+            } else {
+                correctionDate = QDateTime::currentDateTimeUtc();      //in case there is no information about time of this correction it's applied
+            }
+            if (!edited || lastModified < correctionDate) {
+                originalMessage = body;
+                lastModified = correctionDate;
+                setBody(body);
+                setEdited(true);
+            }
         }
-        if (!edited || lastModified < correctionDate) {
-            originalMessage = body;
-            lastModified = correctionDate;
-            setBody(itr.value().toString());
-            setEdited(true);
+    } else {
+        QMap<QString, QVariant>::const_iterator dItr = data.find("stamp");
+        if (dItr != data.end()) {
+            QDateTime ntime = dItr.value().toDateTime();
+            if (time != ntime) {
+                setTime(ntime);
+            }
         }
     }
     
@@ -420,7 +445,7 @@ void Shared::Message::setOutOfBandUrl(const QString& url)
 
 bool Shared::Message::storable() const
 {
-    return id.size() > 0 && (body.size() > 0 || oob.size()) > 0;
+    return id.size() > 0 && (body.size() > 0 || oob.size() > 0 || attachPath.size() > 0);
 }
 
 void Shared::Message::setStanzaId(const QString& sid)
@@ -432,3 +457,33 @@ QString Shared::Message::getStanzaId() const
 {
     return stanzaId;
 }
+
+QString Shared::Message::getAttachPath() const
+{
+    return attachPath;
+}
+
+void Shared::Message::setAttachPath(const QString& path)
+{
+    attachPath = path;
+}
+
+Shared::Message::Change::Change(const QMap<QString, QVariant>& _data):
+    data(_data),
+    idModified(false) {}
+    
+void Shared::Message::Change::operator()(Shared::Message& msg)
+{
+    idModified = msg.change(data);
+}
+
+void Shared::Message::Change::operator()(Shared::Message* msg)
+{
+    idModified = msg->change(data);
+}
+
+bool Shared::Message::Change::hasIdBeenModified() const
+{
+    return idModified;
+}
+

shared/message.h

@@ -16,15 +16,15 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#ifndef SHAPER_MESSAGE_H
+#define SHAPER_MESSAGE_H
+
 #include <QString>
 #include <QDateTime>
 #include <QVariant>
 #include <QMap>
 #include <QDataStream>
 
-#ifndef SHAPER_MESSAGE_H
-#define SHAPER_MESSAGE_H
-
 namespace Shared {
 
 /**
@@ -46,9 +46,22 @@ public:
         delivered,
         error
     };
+    
     static const State StateHighest = State::error;
     static const State StateLowest = State::pending;
     
+    struct Change       //change functor, stores in idModified if ID has been modified during change
+    {
+        Change(const QMap<QString, QVariant>& _data);
+        void operator() (Message& msg);
+        void operator() (Message* msg);
+        bool hasIdBeenModified() const;
+        
+    private:
+        const QMap<QString, QVariant>& data;
+        bool idModified;
+    };
+    
     Message(Type p_type);
     Message();
     
@@ -72,6 +85,7 @@ public:
     void setErrorText(const QString& err);
     bool change(const QMap<QString, QVariant>& data);
     void setStanzaId(const QString& sid);
+    void setAttachPath(const QString& path);
     
     QString getFrom() const;
     QString getFromJid() const;
@@ -100,6 +114,7 @@ public:
     QDateTime getLastModified() const;
     QString getOriginalBody() const;
     QString getStanzaId() const;
+    QString getAttachPath() const;
     
     void serialize(QDataStream& data) const;
     void deserialize(QDataStream& data);
@@ -123,6 +138,7 @@ private:
     QString originalMessage;
     QDateTime lastModified;
     QString stanzaId;
+    QString attachPath;
 };
 
 }

shared/messageinfo.cpp

@@ -0,0 +1,45 @@
+/*
+ * Squawk messenger. 
+ * Copyright (C) 2019  Yury Gubich <blue@macaw.me>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "messageinfo.h"
+
+using namespace Shared;
+
+Shared::MessageInfo::MessageInfo():
+    account(),
+    jid(),
+    messageId() {}
+
+Shared::MessageInfo::MessageInfo(const QString& acc, const QString& j, const QString& id):
+    account(acc),
+    jid(j),
+    messageId(id) {}
+
+Shared::MessageInfo::MessageInfo(const Shared::MessageInfo& other):
+    account(other.account),
+    jid(other.jid),
+    messageId(other.messageId) {}
+
+Shared::MessageInfo & Shared::MessageInfo::operator=(const Shared::MessageInfo& other)
+{
+    account = other.account;
+    jid = other.jid;
+    messageId = other.messageId;
+    
+    return *this;
+}

shared/messageinfo.h

@@ -0,0 +1,43 @@
+/*
+ * Squawk messenger. 
+ * Copyright (C) 2019  Yury Gubich <blue@macaw.me>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef SHARED_MESSAGEINFO_H
+#define SHARED_MESSAGEINFO_H
+
+#include <QString>
+
+namespace Shared {
+
+/**
+ * @todo write docs
+ */
+struct MessageInfo {
+    MessageInfo();
+    MessageInfo(const QString& acc, const QString& j, const QString& id);
+    MessageInfo(const MessageInfo& other);
+    
+    QString account;
+    QString jid;
+    QString messageId;
+    
+    MessageInfo& operator=(const MessageInfo& other);
+};
+
+}
+
+#endif // SHARED_MESSAGEINFO_H

shared/shared.h

@@ -19,11 +19,12 @@
 #ifndef SHARED_H
 #define SHARED_H
 
-#include "shared/enums.h"
-#include "shared/utils.h"
-#include "shared/icons.h"
-#include "shared/message.h"
-#include "shared/vcard.h"
-#include "shared/global.h"
+#include "enums.h"
+#include "global.h"
+#include "icons.h"
+#include "message.h"
+#include "messageinfo.h"
+#include "utils.h"
+#include "vcard.h"
 
 #endif // SHARED_H

shared/utils.h

@@ -20,11 +20,14 @@
 #define SHARED_UTILS_H
 
 #include <QString>
+#include <QStringList>
 #include <QColor>
 #include <QRegularExpression>
 
+//#include "KIO/OpenFileManagerWindowJob"
+
 #include <uuid/uuid.h>
-#include <vector>
+#include <vector> 
 
 namespace Shared {
 

translations/CMakeLists.txt

@@ -0,0 +1,8 @@
+find_package(Qt5LinguistTools)
+
+set(TS_FILES squawk.ru.ts)
+qt5_add_translation(QM_FILES ${TS_FILES})
+add_custom_target(translations ALL DEPENDS ${QM_FILES})
+install(FILES ${QM_FILES} DESTINATION ${CMAKE_INSTALL_DATADIR}/squawk/l10n)
+
+add_dependencies(${CMAKE_PROJECT_NAME} translations)

ui/CMakeLists.txt

@@ -1,45 +1,5 @@
-cmake_minimum_required(VERSION 3.0)
-project(squawkUI)
-
-# Instruct CMake to run moc automatically when needed.
-set(CMAKE_AUTOMOC ON)
-# Instruct CMake to create code from Qt designer ui files
-set(CMAKE_AUTOUIC ON)
-
-# Find the QtWidgets library
-find_package(Qt5Widgets CONFIG REQUIRED)
-find_package(Qt5DBus CONFIG REQUIRED)
+target_sources(squawk PRIVATE squawk.cpp squawk.h squawk.ui)
 
+add_subdirectory(models)
+add_subdirectory(utils)
 add_subdirectory(widgets)
-
-set(squawkUI_SRC
-  squawk.cpp
-  models/accounts.cpp
-  models/roster.cpp
-  models/item.cpp
-  models/account.cpp
-  models/contact.cpp
-  models/presence.cpp
-  models/group.cpp
-  models/room.cpp
-  models/abstractparticipant.cpp
-  models/participant.cpp
-  models/reference.cpp
-  utils/messageline.cpp
-  utils//message.cpp
-  utils/resizer.cpp
-  utils/image.cpp
-  utils/flowlayout.cpp
-  utils/badge.cpp
-  utils/progress.cpp
-  utils/comboboxdelegate.cpp
-  utils/dropshadoweffect.cpp
-)
-
-# Tell CMake to create the helloworld executable
-add_library(squawkUI ${squawkUI_SRC})
-
-# Use the Widgets module from Qt 5.
-target_link_libraries(squawkUI squawkWidgets)
-target_link_libraries(squawkUI Qt5::Widgets)
-target_link_libraries(squawkUI Qt5::DBus)

ui/models/CMakeLists.txt

@@ -0,0 +1,26 @@
+target_sources(squawk PRIVATE
+  abstractparticipant.cpp
+  abstractparticipant.h
+  account.cpp
+  account.h
+  accounts.cpp
+  accounts.h
+  contact.cpp
+  contact.h
+  element.cpp
+  element.h
+  group.cpp
+  group.h
+  item.cpp
+  item.h
+  participant.cpp
+  participant.h
+  presence.cpp
+  presence.h
+  reference.cpp
+  reference.h
+  room.cpp
+  room.h
+  roster.cpp
+  roster.h
+  )

ui/models/account.cpp

@@ -31,7 +31,8 @@ Models::Account::Account(const QMap<QString, QVariant>& data, Models::Item* pare
     avatarPath(data.value("avatarPath").toString()),
     state(Shared::ConnectionState::disconnected),
     availability(Shared::Availability::offline),
-    passwordType(Shared::AccountPassword::plain)
+    passwordType(Shared::AccountPassword::plain),
+    wasEverConnected(false)
 {
     QMap<QString, QVariant>::const_iterator sItr = data.find("state");
     if (sItr != data.end()) {
@@ -56,8 +57,19 @@ void Models::Account::setState(Shared::ConnectionState p_state)
     if (state != p_state) {
         state = p_state;
         changed(2);
-        if (state == Shared::ConnectionState::disconnected) {
-            toOfflineState();
+        switch (state) {
+            case Shared::ConnectionState::disconnected:
+                toOfflineState();
+                break;
+            case Shared::ConnectionState::connected:
+                if (wasEverConnected) {
+                    emit reconnected();
+                } else {
+                    wasEverConnected = true;
+                }
+                break;
+            default:
+                break;
         }
     }
 }
@@ -231,7 +243,7 @@ void Models::Account::toOfflineState()
     Item::toOfflineState();
 }
 
-QString Models::Account::getAvatarPath()
+QString Models::Account::getAvatarPath() const
 {
     return avatarPath;
 }

ui/models/account.h

@@ -57,7 +57,7 @@ namespace Models {
         QString getError() const;
         
         void setAvatarPath(const QString& path);
-        QString getAvatarPath();
+        QString getAvatarPath() const;
         
         void setAvailability(Shared::Availability p_avail);
         void setAvailability(unsigned int p_avail);
@@ -77,6 +77,9 @@ namespace Models {
         QString getBareJid() const;
         QString getFullJid() const;
         
+    signals:
+        void reconnected();
+        
     private:
         QString login;
         QString password;
@@ -87,6 +90,7 @@ namespace Models {
         Shared::ConnectionState state;
         Shared::Availability availability;
         Shared::AccountPassword passwordType;
+        bool wasEverConnected;
         
     protected slots:
         void toOfflineState() override;

ui/models/contact.cpp

@@ -17,55 +17,26 @@
  */
 
 #include "contact.h"
-#include "account.h"
 
 #include <QDebug>
 
 Models::Contact::Contact(const Account* acc, const QString& p_jid ,const QMap<QString, QVariant> &data, Item *parentItem):
-    Item(Item::contact, data, parentItem),
-    jid(p_jid),
+    Element(Item::contact, acc, p_jid, data, parentItem),
     availability(Shared::Availability::offline),
     state(Shared::SubscriptionState::none),
-    avatarState(Shared::Avatar::empty),
     presences(),
-    messages(),
-    childMessages(0),
-    status(),
-    avatarPath(),
-    account(acc)
+    status()
 {
     QMap<QString, QVariant>::const_iterator itr = data.find("state");
     if (itr != data.end()) {
         setState(itr.value().toUInt());
     }
-    
-    itr = data.find("avatarState");
-    if (itr != data.end()) {
-        setAvatarState(itr.value().toUInt());
-    }
-    itr = data.find("avatarPath");
-    if (itr != data.end()) {
-        setAvatarPath(itr.value().toString());
-    }
 }
 
 Models::Contact::~Contact()
 {
 }
 
-QString Models::Contact::getJid() const
-{
-    return jid;
-}
-
-void Models::Contact::setJid(const QString p_jid)
-{
-    if (jid != p_jid) {
-        jid = p_jid;
-        changed(1);
-    }
-}
-
 void Models::Contact::setAvailability(unsigned int p_state)
 {
     setAvailability(Shared::Global::fromInt<Shared::Availability>(p_state));
@@ -144,16 +115,12 @@ void Models::Contact::update(const QString& field, const QVariant& value)
 {
     if (field == "name") {
         setName(value.toString());
-    } else if (field == "jid") {
-        setJid(value.toString());
     } else if (field == "availability") {
         setAvailability(value.toUInt());
     } else if (field == "state") {
         setState(value.toUInt());
-    } else if (field == "avatarState") {
-        setAvatarState(value.toUInt());
-    } else if (field == "avatarPath") {
-        setAvatarPath(value.toString());
+    } else {
+        Element::update(field, value);
     }
 }
 
@@ -192,11 +159,9 @@ void Models::Contact::refresh()
 {
     QDateTime lastActivity;
     Presence* presence = 0;
-    unsigned int count = 0;
     for (QMap<QString, Presence*>::iterator itr = presences.begin(), end = presences.end(); itr != end; ++itr) {
         Presence* pr = itr.value();
         QDateTime la = pr->getLastActivity();
-        count += pr->getMessagesCount();
         
         if (la > lastActivity) {
             lastActivity = la;
@@ -211,11 +176,6 @@ void Models::Contact::refresh()
         setAvailability(Shared::Availability::offline);
         setStatus("");
     }
-    
-    if (childMessages != count) {
-        childMessages = count;
-        changed(4);
-    }
 }
 
 void Models::Contact::_removeChild(int index)
@@ -257,81 +217,6 @@ QIcon Models::Contact::getStatusIcon(bool big) const
     }
 }
 
-void Models::Contact::addMessage(const Shared::Message& data)
-{
-    const QString& res = data.getPenPalResource();
-    if (res.size() > 0) {
-        QMap<QString, Presence*>::iterator itr = presences.find(res);
-        if (itr == presences.end()) {
-            // this is actually the place when I can spot someone's invisible presence, and there is nothing criminal in it, cuz the sender sent us a message
-            // therefore he have revealed himself
-            // the only issue is to find out when the sender is gone offline
-            Presence* pr = new Presence({});
-            pr->setName(res);
-            pr->setAvailability(Shared::Availability::invisible);
-            pr->setLastActivity(QDateTime::currentDateTimeUtc());
-            presences.insert(res, pr);
-            appendChild(pr);
-            pr->addMessage(data);
-            return;
-        }
-        itr.value()->addMessage(data);
-    } else {
-        messages.emplace_back(data);
-        changed(4);
-    }
-}
-
-void Models::Contact::changeMessage(const QString& id, const QMap<QString, QVariant>& data)
-{
-
-    bool found = false;
-    for (Shared::Message& msg : messages) {
-        if (msg.getId() == id) {
-            msg.change(data);
-            found = true;
-            break;
-        }
-    }
-    if (!found) {
-        for (Presence* pr : presences) {
-            found = pr->changeMessage(id, data);
-            if (found) {
-                break;
-            }
-        }
-    }
-}
-
-unsigned int Models::Contact::getMessagesCount() const
-{
-    return messages.size() + childMessages;
-}
-
-void Models::Contact::dropMessages()
-{
-    if (messages.size() > 0) {
-        messages.clear();
-        changed(4);
-    }
-    
-    for (QMap<QString, Presence*>::iterator itr = presences.begin(), end = presences.end(); itr != end; ++itr) {
-        itr.value()->dropMessages();
-    }
-}
-
-void Models::Contact::getMessages(Models::Contact::Messages& container) const
-{
-    for (Messages::const_iterator itr = messages.begin(), end = messages.end(); itr != end; ++itr) {
-        const Shared::Message& msg = *itr;
-        container.push_back(msg);
-    }
-    
-    for (QMap<QString, Presence*>::const_iterator itr = presences.begin(), end = presences.end(); itr != end; ++itr) {
-        itr.value()->getMessages(container);
-    }
-}
-
 void Models::Contact::toOfflineState()
 {
     std::deque<Item*>::size_type size = childItems.size();
@@ -355,75 +240,9 @@ QString Models::Contact::getDisplayedName() const
     return getContactName();
 }
 
-bool Models::Contact::columnInvolvedInDisplay(int col)
+void Models::Contact::handleRecconnect()
 {
-    return Item::columnInvolvedInDisplay(col) && col == 1;
-}
-
-Models::Contact * Models::Contact::copy() const
-{
-    Contact* cnt = new Contact(*this);
-    return cnt;
-}
-
-Models::Contact::Contact(const Models::Contact& other):
-    Item(other),
-    jid(other.jid),
-    availability(other.availability),
-    state(other.state),
-    presences(),
-    messages(other.messages),
-    childMessages(0),
-    account(other.account)
-{
-    for (const Presence* pres : other.presences) {
-        Presence* pCopy = new Presence(*pres);
-        presences.insert(pCopy->getName(), pCopy);
-        Item::appendChild(pCopy);
-        connect(pCopy, &Item::childChanged, this, &Contact::refresh);
-    }
-    
-    refresh();
-}
-
-QString Models::Contact::getAvatarPath() const
-{
-    return avatarPath;
-}
-
-Shared::Avatar Models::Contact::getAvatarState() const
-{
-    return avatarState;
-}
-
-void Models::Contact::setAvatarPath(const QString& path)
-{
-    if (path != avatarPath) {
-        avatarPath = path;
-        changed(7);
+    if (getMessagesCount() > 0) {
+        feed->requestLatestMessages();
     }
 }
-
-void Models::Contact::setAvatarState(Shared::Avatar p_state)
-{
-    if (avatarState != p_state) {
-        avatarState = p_state;
-        changed(6);
-    }
-}
-
-void Models::Contact::setAvatarState(unsigned int p_state)
-{
-    if (p_state <= static_cast<quint8>(Shared::Avatar::valid)) {
-        Shared::Avatar state = static_cast<Shared::Avatar>(p_state);
-        setAvatarState(state);
-    } else {
-        qDebug() << "An attempt to set invalid avatar state" << p_state << "to the contact" << jid << ", skipping";
-    }
-}
-
-const Models::Account * Models::Contact::getParentAccount() const
-{
-    return account;
-}
-

ui/models/contact.h

@@ -19,7 +19,7 @@
 #ifndef MODELS_CONTACT_H
 #define MODELS_CONTACT_H
 
-#include "item.h"
+#include "element.h"
 #include "presence.h"
 #include "shared/enums.h"
 #include "shared/message.h"
@@ -31,49 +31,36 @@
 #include <deque>
 
 namespace Models {
-class Account;
     
-class Contact : public Item
+class Contact : public Element
 {
     Q_OBJECT
 public:
-    typedef std::deque<Shared::Message> Messages;
     Contact(const Account* acc, const QString& p_jid, const QMap<QString, QVariant> &data, Item *parentItem = 0);
-    Contact(const Contact& other);
     ~Contact();
     
-    QString getJid() const;
     Shared::Availability getAvailability() const;
     Shared::SubscriptionState getState() const;
-    Shared::Avatar getAvatarState() const;
-    QString getAvatarPath() const;
+
     QIcon getStatusIcon(bool big = false) const;
     
     int columnCount() const override;
     QVariant data(int column) const override;
         
-    void update(const QString& field, const QVariant& value);
+    void update(const QString& field, const QVariant& value) override;
     
     void addPresence(const QString& name, const QMap<QString, QVariant>& data);
     void removePresence(const QString& name);
     
     QString getContactName() const;
     QString getStatus() const;
-    
-    void addMessage(const Shared::Message& data);
-    void changeMessage(const QString& id, const QMap<QString, QVariant>& data);
-    unsigned int getMessagesCount() const;
-    void dropMessages();
-    void getMessages(Messages& container) const;
     QString getDisplayedName() const override;
     
-    Contact* copy() const;
+    void handleRecconnect();        //this is a special method Models::Roster calls when reconnect happens
     
 protected:
     void _removeChild(int index) override;
     void _appendChild(Models::Item * child) override;
-    bool columnInvolvedInDisplay(int col) override;
-    const Account* getParentAccount() const override;
     
 protected slots:
     void refresh();
@@ -84,23 +71,13 @@ protected:
     void setAvailability(unsigned int p_state);
     void setState(Shared::SubscriptionState p_state);
     void setState(unsigned int p_state);
-    void setAvatarState(Shared::Avatar p_state);
-    void setAvatarState(unsigned int p_state);
-    void setAvatarPath(const QString& path);
-    void setJid(const QString p_jid);
     void setStatus(const QString& p_state);
     
 private:
-    QString jid;
     Shared::Availability availability;
     Shared::SubscriptionState state;
-    Shared::Avatar avatarState;
     QMap<QString, Presence*> presences;
-    Messages messages;
-    unsigned int childMessages;
     QString status;
-    QString avatarPath;
-    const Account* account;
 };
 
 }

ui/models/element.cpp

@@ -0,0 +1,184 @@
+/*
+ * Squawk messenger. 
+ * Copyright (C) 2019  Yury Gubich <blue@macaw.me>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "element.h"
+#include "account.h"
+
+#include <QDebug>
+
+Models::Element::Element(Type p_type, const Models::Account* acc, const QString& p_jid, const QMap<QString, QVariant>& data, Models::Item* parentItem):
+    Item(p_type, data, parentItem),
+    jid(p_jid),
+    avatarPath(),
+    avatarState(Shared::Avatar::empty),
+    account(acc),
+    feed(new MessageFeed(this))
+{
+    connect(feed, &MessageFeed::requestArchive, this, &Element::requestArchive);
+    connect(feed, &MessageFeed::fileDownloadRequest, this, &Element::fileDownloadRequest);
+    connect(feed, &MessageFeed::unreadMessagesCountChanged, this, &Element::onFeedUnreadMessagesCountChanged);
+    connect(feed, &MessageFeed::unnoticedMessage, this, &Element::onFeedUnnoticedMessage);
+    connect(feed, &MessageFeed::localPathInvalid, this, &Element::localPathInvalid);
+    
+    QMap<QString, QVariant>::const_iterator itr = data.find("avatarState");
+    if (itr != data.end()) {
+        setAvatarState(itr.value().toUInt());
+    }
+    itr = data.find("avatarPath");
+    if (itr != data.end()) {
+        setAvatarPath(itr.value().toString());
+    }
+}
+
+Models::Element::~Element()
+{
+    delete feed;
+}
+
+
+QString Models::Element::getJid() const
+{
+    return jid;
+}
+
+void Models::Element::setJid(const QString& p_jid)
+{
+    if (jid != p_jid) {
+        jid = p_jid;
+        changed(1);
+    }
+}
+
+void Models::Element::update(const QString& field, const QVariant& value)
+{
+    if (field == "jid") {
+        setJid(value.toString());
+    } else if (field == "avatarState") {
+        setAvatarState(value.toUInt());
+    } else if (field == "avatarPath") {
+        setAvatarPath(value.toString());
+    }
+}
+
+QString Models::Element::getAvatarPath() const
+{
+    return avatarPath;
+}
+
+Shared::Avatar Models::Element::getAvatarState() const
+{
+    return avatarState;
+}
+
+void Models::Element::setAvatarPath(const QString& path)
+{
+    if (path != avatarPath) {
+        avatarPath = path;
+        if (type == contact) {
+            changed(7);
+        } else if (type == room) {
+            changed(8);
+        }
+    }
+}
+
+void Models::Element::setAvatarState(Shared::Avatar p_state)
+{
+    if (avatarState != p_state) {
+        avatarState = p_state;
+        if (type == contact) {
+            changed(6);
+        } else if (type == room) {
+            changed(7);
+        }
+    }
+}
+
+void Models::Element::setAvatarState(unsigned int p_state)
+{
+    if (p_state <= static_cast<quint8>(Shared::Avatar::valid)) {
+        Shared::Avatar state = static_cast<Shared::Avatar>(p_state);
+        setAvatarState(state);
+    } else {
+        qDebug() << "An attempt to set invalid avatar state" << p_state << "to the element" << jid << ", skipping";
+    }
+}
+
+bool Models::Element::columnInvolvedInDisplay(int col)
+{
+    return Item::columnInvolvedInDisplay(col) && col == 1;
+}
+
+const Models::Account * Models::Element::getParentAccount() const
+{
+    return account;
+}
+
+unsigned int Models::Element::getMessagesCount() const
+{
+    return feed->unreadMessagesCount();
+}
+
+void Models::Element::addMessage(const Shared::Message& data)
+{
+    feed->addMessage(data);
+}
+
+void Models::Element::changeMessage(const QString& id, const QMap<QString, QVariant>& data)
+{
+    feed->changeMessage(id, data);
+}
+
+void Models::Element::responseArchive(const std::list<Shared::Message> list, bool last)
+{
+    feed->responseArchive(list, last);
+}
+
+bool Models::Element::isRoom() const
+{
+    return type != contact;
+}
+
+void Models::Element::fileProgress(const QString& messageId, qreal value, bool up)
+{
+    feed->fileProgress(messageId, value, up);
+}
+
+void Models::Element::fileComplete(const QString& messageId, bool up)
+{
+    feed->fileComplete(messageId, up);
+}
+
+void Models::Element::fileError(const QString& messageId, const QString& error, bool up)
+{
+    feed->fileError(messageId, error, up);
+}
+
+void Models::Element::onFeedUnreadMessagesCountChanged()
+{
+    if (type == contact) {
+        changed(4);
+    } else if (type == room) {
+        changed(5);
+    }
+}
+
+void Models::Element::onFeedUnnoticedMessage(const Shared::Message& msg)
+{
+    emit unnoticedMessage(getAccountName(), msg);
+}

ui/models/element.h

@@ -0,0 +1,82 @@
+/*
+ * Squawk messenger. 
+ * Copyright (C) 2019  Yury Gubich <blue@macaw.me>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef ELEMENT_H
+#define ELEMENT_H
+
+#include "item.h"
+
+#include "ui/widgets/messageline/messagefeed.h"
+
+namespace Models {
+    
+class Element : public Item
+{
+    Q_OBJECT
+protected:
+    Element(Type p_type, const Account* acc, const QString& p_jid, const QMap<QString, QVariant> &data, Item *parentItem = 0);
+    ~Element();
+    
+public:
+    QString getJid() const;
+    Shared::Avatar getAvatarState() const;
+    QString getAvatarPath() const;
+    
+    virtual void update(const QString& field, const QVariant& value);
+    
+    void addMessage(const Shared::Message& data);
+    void changeMessage(const QString& id, const QMap<QString, QVariant>& data);
+    unsigned int getMessagesCount() const;
+    void responseArchive(const std::list<Shared::Message> list, bool last);
+    bool isRoom() const;
+    void fileProgress(const QString& messageId, qreal value, bool up);
+    void fileError(const QString& messageId, const QString& error, bool up);
+    void fileComplete(const QString& messageId, bool up);
+    
+signals:
+    void requestArchive(const QString& before);
+    void fileDownloadRequest(const QString& url);
+    void unnoticedMessage(const QString& account, const Shared::Message& msg);
+    void localPathInvalid(const QString& path);
+    
+protected:
+    void setJid(const QString& p_jid);
+    void setAvatarState(Shared::Avatar p_state);
+    void setAvatarState(unsigned int p_state);
+    void setAvatarPath(const QString& path);
+    bool columnInvolvedInDisplay(int col) override;
+    const Account* getParentAccount() const override;
+    
+protected slots:
+    void onFeedUnreadMessagesCountChanged();
+    void onFeedUnnoticedMessage(const Shared::Message& msg);
+    
+protected:
+    QString jid;
+    QString avatarPath;
+    Shared::Avatar avatarState;
+    
+    const Account* account;
+
+public:
+    MessageFeed* feed;
+};
+
+}
+
+#endif // ELEMENT_H

ui/models/item.cpp

@@ -283,6 +283,15 @@ Shared::ConnectionState Models::Item::getAccountConnectionState() const
     return acc->getState();
 }
 
+QString Models::Item::getAccountAvatarPath() const
+{
+    const Account* acc = getParentAccount();
+    if (acc == nullptr) {
+        return "";
+    }
+    return acc->getAvatarPath();
+}
+
 QString Models::Item::getDisplayedName() const
 {
     return name;

ui/models/item.h

@@ -80,6 +80,7 @@ class Item : public QObject{
         QString getAccountName() const;
         QString getAccountJid() const;
         QString getAccountResource() const;
+        QString getAccountAvatarPath() const;
         Shared::ConnectionState getAccountConnectionState() const;
         Shared::Availability getAccountAvailability() const;
         

ui/models/presence.cpp

@@ -20,82 +20,15 @@
 #include "shared/icons.h"
 
 Models::Presence::Presence(const QMap<QString, QVariant>& data, Item* parentItem):
-    AbstractParticipant(Item::presence, data, parentItem),
-    messages()
+    AbstractParticipant(Item::presence, data, parentItem)
 {
 }
 
-Models::Presence::Presence(const Models::Presence& other):
-    AbstractParticipant(other),
-    messages(other.messages)
-{
-}
-
-
 Models::Presence::~Presence()
 {
 }
 
 int Models::Presence::columnCount() const
 {
-    return 5;
-}
-
-QVariant Models::Presence::data(int column) const
-{
-    switch (column) {
-        case 4:
-            return getMessagesCount();
-        default:
-            return AbstractParticipant::data(column);
-    }
-}
-
-unsigned int Models::Presence::getMessagesCount() const
-{
-    return messages.size();
-}
-
-void Models::Presence::addMessage(const Shared::Message& data)
-{
-    messages.emplace_back(data);
-    changed(4);
-}
-
-bool Models::Presence::changeMessage(const QString& id, const QMap<QString, QVariant>& data)
-{
-    bool found = false;
-    for (Shared::Message& msg : messages) {
-        if (msg.getId() == id) {
-            msg.change(data);
-            found = true;
-            break;
-        }
-    }
-    return found;
-}
-
-void Models::Presence::dropMessages()
-{
-    if (messages.size() > 0) {
-        messages.clear();
-        changed(4);
-    }
-}
-
-QIcon Models::Presence::getStatusIcon(bool big) const
-{
-    if (getMessagesCount() > 0) {
-        return Shared::icon("mail-message", big);
-    } else {
-        return AbstractParticipant::getStatusIcon();
-    }
-}
-
-void Models::Presence::getMessages(Models::Presence::Messages& container) const
-{
-    for (Messages::const_iterator itr = messages.begin(), end = messages.end(); itr != end; ++itr) {
-        const Shared::Message& msg = *itr;
-        container.push_back(msg);
-    }
+    return 4;
 }

ui/models/presence.h

@@ -32,25 +32,10 @@ class Presence : public Models::AbstractParticipant
 {
     Q_OBJECT
 public:
-    typedef std::deque<Shared::Message> Messages;
     explicit Presence(const QMap<QString, QVariant> &data, Item *parentItem = 0);
-    Presence(const Presence& other);
     ~Presence();
     
     int columnCount() const override;
-    QVariant data(int column) const override;
-    
-    QIcon getStatusIcon(bool big = false) const override;
-    
-    unsigned int getMessagesCount() const;
-    void dropMessages();
-    void addMessage(const Shared::Message& data);
-    bool changeMessage(const QString& id, const QMap<QString, QVariant>& data);
-    
-    void getMessages(Messages& container) const;
-
-private:
-    Messages messages;
 };
 
 }

ui/models/reference.cpp

@@ -104,6 +104,8 @@ void Models::Reference::onChildChanged(Models::Item* item, int row, int col)
 {
     if (item == original) {
         emit childChanged(this, row, col);
+    } else {
+        emit childChanged(item, row, col);
     }
 }
 

ui/models/room.cpp

@@ -22,16 +22,12 @@
 #include <QIcon>
 #include <QDebug>
 
-Models::Room::Room(const QString& p_jid, const QMap<QString, QVariant>& data, Models::Item* parentItem):
-    Item(room, data, parentItem),
+Models::Room::Room(const Account* acc, const QString& p_jid, const QMap<QString, QVariant>& data, Models::Item* parentItem):
+    Element(room, acc, p_jid, data, parentItem),
     autoJoin(false),
     joined(false),
-    jid(p_jid),
     nick(""),
     subject(""),
-    avatarState(Shared::Avatar::empty),
-    avatarPath(""),
-    messages(),
     participants(),
     exParticipantAvatars()
 {
@@ -55,16 +51,6 @@ Models::Room::Room(const QString& p_jid, const QMap<QString, QVariant>& data, Mo
         setSubject(itr.value().toString());
     }
     
-    itr = data.find("avatarState");
-    if (itr != data.end()) {
-        setAvatarState(itr.value().toUInt());
-    }
-    itr = data.find("avatarPath");
-    if (itr != data.end()) {
-        setAvatarPath(itr.value().toString());
-    }
-    
-    
     itr = data.find("avatars");
     if (itr != data.end()) {
         QMap<QString, QVariant> avs = itr.value().toMap();
@@ -78,21 +64,11 @@ Models::Room::~Room()
 {
 }
 
-unsigned int Models::Room::getUnreadMessagesCount() const
-{
-    return messages.size();
-}
-
 int Models::Room::columnCount() const
 {
     return 7;
 }
 
-QString Models::Room::getJid() const
-{
-    return jid;
-}
-
 bool Models::Room::getAutoJoin() const
 {
     return autoJoin;
@@ -151,14 +127,6 @@ void Models::Room::setAutoJoin(bool p_autoJoin)
     }
 }
 
-void Models::Room::setJid(const QString& p_jid)
-{
-    if (jid != p_jid) {
-        jid = p_jid;
-        changed(1);
-    }
-}
-
 void Models::Room::setJoined(bool p_joined)
 {
     if (joined != p_joined) {
@@ -182,8 +150,6 @@ void Models::Room::update(const QString& field, const QVariant& value)
 {
     if (field == "name") {
         setName(value.toString());
-    } else if (field == "jid") {
-        setJid(value.toString());
     } else if (field == "joined") {
         setJoined(value.toBool());
     } else if (field == "autoJoin") {
@@ -192,16 +158,14 @@ void Models::Room::update(const QString& field, const QVariant& value)
         setNick(value.toString());
     } else if (field == "subject") {
         setSubject(value.toString());
-    } else if (field == "avatarState") {
-        setAvatarState(value.toUInt());
-    } else if (field == "avatarPath") {
-        setAvatarPath(value.toString());
+    } else {
+        Element::update(field, value);
     }
 }
 
 QIcon Models::Room::getStatusIcon(bool big) const
 {
-    if (messages.size() > 0) {
+    if (getMessagesCount() > 0) {
         return Shared::icon("mail-message", big);
     } else {
         if (autoJoin) {
@@ -237,42 +201,6 @@ QString Models::Room::getStatusText() const
     }
 }
 
-unsigned int Models::Room::getMessagesCount() const
-{
-    return messages.size();
-}
-
-void Models::Room::addMessage(const Shared::Message& data)
-{
-    messages.emplace_back(data);
-    changed(5);
-}
-
-void Models::Room::changeMessage(const QString& id, const QMap<QString, QVariant>& data)
-{
-    for (Shared::Message& msg : messages) {
-        if (msg.getId() == id) {
-            msg.change(data);
-            break;
-        }
-    }
-}
-
-void Models::Room::dropMessages()
-{
-    if (messages.size() > 0) {
-        messages.clear();
-        changed(5);
-    }
-}
-
-void Models::Room::getMessages(Models::Room::Messages& container) const
-{
-    for (Messages::const_iterator itr = messages.begin(), end = messages.end(); itr != end; ++itr) {
-        const Shared::Message& msg = *itr;
-        container.push_back(msg);
-    }
-}
 
 void Models::Room::toOfflineState()
 {
@@ -367,47 +295,6 @@ QString Models::Room::getDisplayedName() const
     return getRoomName();
 }
 
-bool Models::Room::columnInvolvedInDisplay(int col)
-{
-    return Item::columnInvolvedInDisplay(col) && col == 1;
-}
-
-QString Models::Room::getAvatarPath() const
-{
-    return avatarPath;
-}
-
-Shared::Avatar Models::Room::getAvatarState() const
-{
-    return avatarState;
-}
-
-void Models::Room::setAvatarPath(const QString& path)
-{
-    if (avatarPath != path) {
-        avatarPath = path;
-        changed(8);
-    }
-}
-
-void Models::Room::setAvatarState(Shared::Avatar p_state)
-{
-    if (avatarState != p_state) {
-        avatarState = p_state;
-        changed(7);
-    }
-}
-
-void Models::Room::setAvatarState(unsigned int p_state)
-{
-    if (p_state <= static_cast<quint8>(Shared::Avatar::valid)) {
-        Shared::Avatar state = static_cast<Shared::Avatar>(p_state);
-        setAvatarState(state);
-    } else {
-        qDebug() << "An attempt to set invalid avatar state" << p_state << "to the room" << jid << ", skipping";
-    }
-}
-
 std::map<QString, const Models::Participant &> Models::Room::getParticipants() const
 {
     std::map<QString, const Models::Participant&> result;
@@ -423,7 +310,12 @@ QString Models::Room::getParticipantIconPath(const QString& name) const
 {
     std::map<QString, Models::Participant*>::const_iterator itr = participants.find(name);
     if (itr == participants.end()) {
-        return "";
+        std::map<QString, QString>::const_iterator eitr = exParticipantAvatars.find(name);
+        if (eitr != exParticipantAvatars.end()) {
+            return eitr->second;
+        } else {
+            return "";
+        }
     }
     
     return itr->second->getAvatarPath();

ui/models/room.h

@@ -19,7 +19,7 @@
 #ifndef MODELS_ROOM_H
 #define MODELS_ROOM_H
 
-#include "item.h"
+#include "element.h"
 #include "participant.h"
 #include "shared/enums.h"
 #include "shared/message.h"
@@ -29,21 +29,18 @@ namespace Models {
 /**
  * @todo write docs
  */
-class Room : public Models::Item
+class Room : public Element
 {
     Q_OBJECT
 public:
-    typedef std::deque<Shared::Message> Messages;
-    Room(const QString& p_jid, const QMap<QString, QVariant> &data, Item *parentItem = 0);
+    Room(const Account* acc, const QString& p_jid, const QMap<QString, QVariant> &data, Item *parentItem = 0);
     ~Room();
     
     int columnCount() const override;
     QVariant data(int column) const override;
     
-    unsigned int getUnreadMessagesCount() const;
     bool getJoined() const;
     bool getAutoJoin() const;
-    QString getJid() const;
     QString getNick() const;
     QString getRoomName() const;
     QString getSubject() const;
@@ -53,17 +50,10 @@ public:
     
     void setJoined(bool p_joined);
     void setAutoJoin(bool p_autoJoin);
-    void setJid(const QString& p_jid);
     void setNick(const QString& p_nick);
     void setSubject(const QString& sub);
     
-    void update(const QString& field, const QVariant& value);
-    
-    void addMessage(const Shared::Message& data);
-    void changeMessage(const QString& id, const QMap<QString, QVariant>& data);
-    unsigned int getMessagesCount() const;
-    void dropMessages();
-    void getMessages(Messages& container) const;
+    void update(const QString& field, const QVariant& value) override;
     
     void addParticipant(const QString& name, const QMap<QString, QVariant>& data);
     void changeParticipant(const QString& name, const QMap<QString, QVariant>& data);
@@ -71,8 +61,6 @@ public:
     
     void toOfflineState() override;
     QString getDisplayedName() const override;
-    Shared::Avatar getAvatarState() const;
-    QString getAvatarPath() const;
     std::map<QString, const Participant&> getParticipants() const;
     QString getParticipantIconPath(const QString& name) const;
     std::map<QString, QString> getExParticipantAvatars() const;
@@ -84,24 +72,14 @@ signals:
 private:
     void handleParticipantUpdate(std::map<QString, Participant*>::const_iterator itr, const QMap<QString, QVariant>& data);
     
-protected:
-    bool columnInvolvedInDisplay(int col) override;
-    void setAvatarState(Shared::Avatar p_state);
-    void setAvatarState(unsigned int p_state);
-    void setAvatarPath(const QString& path);
-    
 private:
     bool autoJoin;
     bool joined;
     QString jid;
     QString nick;
     QString subject;
-    Shared::Avatar avatarState;
-    QString avatarPath;
-    Messages messages;
     std::map<QString, Participant*> participants;
     std::map<QString, QString> exParticipantAvatars;
-
 };
 
 }

ui/models/roster.cpp

@@ -48,6 +48,7 @@ Models::Roster::~Roster()
 void Models::Roster::addAccount(const QMap<QString, QVariant>& data)
 {
     Account* acc = new Account(data);
+    connect(acc, &Account::reconnected, this, &Roster::onAccountReconnected);
     root->appendChild(acc);
     accounts.insert(std::make_pair(acc->getName(), acc));
     accountsModel->addAccount(acc);
@@ -215,11 +216,7 @@ QVariant Models::Roster::data (const QModelIndex& index, int role) const
                     break;
                 case Item::presence: {
                     Presence* contact = static_cast<Presence*>(item);
-                    QString str("");
-                    int mc = contact->getMessagesCount();
-                    if (mc > 0) {
-                        str += tr("New messages: ") + std::to_string(mc).c_str() + "\n";
-                    }
+                    QString str;
                     Shared::Availability av = contact->getAvailability();
                     str += tr("Availability: ") + Shared::Global::getName(av);
                     QString s = contact->getStatus();
@@ -232,7 +229,7 @@ QVariant Models::Roster::data (const QModelIndex& index, int role) const
                     break;
                 case Item::participant: {
                     Participant* p = static_cast<Participant*>(item);
-                    QString str("");
+                    QString str;
                     Shared::Availability av = p->getAvailability();
                     str += tr("Availability: ") + Shared::Global::getName(av) + "\n";
                     QString s = p->getStatus();
@@ -260,7 +257,7 @@ QVariant Models::Roster::data (const QModelIndex& index, int role) const
                     break;
                 case Item::room: {
                     Room* rm = static_cast<Room*>(item);
-                    unsigned int count = rm->getUnreadMessagesCount();
+                    unsigned int count = rm->getMessagesCount();
                     QString str("");
                     if (count > 0) {
                         str += tr("New messages: ") + std::to_string(count).c_str() + "\n";
@@ -450,6 +447,10 @@ void Models::Roster::addContact(const QString& account, const QString& jid, cons
         std::map<ElId, Contact*>::iterator itr = contacts.find(id);
         if (itr == contacts.end()) {
             contact = new Contact(acc, jid, data);
+            connect(contact, &Contact::requestArchive, this, &Roster::onElementRequestArchive);
+            connect(contact, &Contact::fileDownloadRequest, this, &Roster::fileDownloadRequest);
+            connect(contact, &Contact::unnoticedMessage, this, &Roster::unnoticedMessage);
+            connect(contact, &Contact::localPathInvalid, this, &Roster::localPathInvalid);
             contacts.insert(std::make_pair(id, contact));
         } else {
             contact = itr->second;
@@ -535,35 +536,19 @@ void Models::Roster::removeGroup(const QString& account, const QString& name)
 
 void Models::Roster::changeContact(const QString& account, const QString& jid, const QMap<QString, QVariant>& data)
 {
-    ElId id(account, jid);
-    std::map<ElId, Contact*>::iterator cItr = contacts.find(id);
-    
-    if (cItr != contacts.end()) {
+    Element* el = getElement({account, jid});
+    if (el != NULL) {
         for (QMap<QString, QVariant>::const_iterator itr = data.begin(), end = data.end(); itr != end; ++itr) {
-            cItr->second->update(itr.key(), itr.value());
-        }
-    } else {
-        std::map<ElId, Room*>::iterator rItr = rooms.find(id);
-        if (rItr != rooms.end()) {
-            for (QMap<QString, QVariant>::const_iterator itr = data.begin(), end = data.end(); itr != end; ++itr) {
-                rItr->second->update(itr.key(), itr.value());
-            }
+            el->update(itr.key(), itr.value());
         }
     }
 }
 
 void Models::Roster::changeMessage(const QString& account, const QString& jid, const QString& id, const QMap<QString, QVariant>& data)
 {
-    ElId elid(account, jid);
-    std::map<ElId, Contact*>::iterator cItr = contacts.find(elid);
-    
-    if (cItr != contacts.end()) {
-        cItr->second->changeMessage(id, data);
-    } else {
-        std::map<ElId, Room*>::iterator rItr = rooms.find(elid);
-        if (rItr != rooms.end()) {
-            rItr->second->changeMessage(id, data);
-        }
+    Element* el = getElement({account, jid});
+    if (el != NULL) {
+        el->changeMessage(id, data);
     }
 }
 
@@ -627,7 +612,6 @@ void Models::Roster::removeContact(const QString& account, const QString& jid, c
     } else {
         delete ref;
     }
-    
     if (gr->childCount() == 0) {
         removeGroup(account, group);
     }
@@ -708,29 +692,9 @@ void Models::Roster::removePresence(const QString& account, const QString& jid,
 
 void Models::Roster::addMessage(const QString& account, const Shared::Message& data)
 {
-    ElId id(account, data.getPenPalJid());
-    std::map<ElId, Contact*>::iterator itr = contacts.find(id);
-    if (itr != contacts.end()) {
-        itr->second->addMessage(data);
-    } else {
-        std::map<ElId, Room*>::const_iterator rItr = rooms.find(id);
-        if (rItr != rooms.end()) {
-            rItr->second->addMessage(data);
-        }
-    }
-}
-
-void Models::Roster::dropMessages(const QString& account, const QString& jid)
-{
-    ElId id(account, jid);
-    std::map<ElId, Contact*>::iterator itr = contacts.find(id);
-    if (itr != contacts.end()) {
-        itr->second->dropMessages();
-    } else {
-        std::map<ElId, Room*>::const_iterator rItr = rooms.find(id);
-        if (rItr != rooms.end()) {
-            rItr->second->dropMessages();
-        }
+    Element* el = getElement({account, data.getPenPalJid()});
+    if (el != NULL) {
+        el->addMessage(data);
     }
 }
 
@@ -781,6 +745,7 @@ void Models::Roster::removeAccount(const QString& account)
         }
     }
     
+    disconnect(acc, &Account::reconnected, this, &Roster::onAccountReconnected);
     acc->deleteLater();
 }
 
@@ -821,7 +786,11 @@ void Models::Roster::addRoom(const QString& account, const QString jid, const QM
         return;
     }
     
-    Room* room = new Room(jid, data);
+    Room* room = new Room(acc, jid, data);
+    connect(room, &Contact::requestArchive, this, &Roster::onElementRequestArchive);
+    connect(room, &Contact::fileDownloadRequest, this, &Roster::fileDownloadRequest);
+    connect(room, &Contact::unnoticedMessage, this, &Roster::unnoticedMessage);
+    connect(room, &Contact::localPathInvalid, this, &Roster::localPathInvalid);
     rooms.insert(std::make_pair(id, room));
     acc->appendChild(room);
 }
@@ -974,3 +943,77 @@ QModelIndex Models::Roster::getGroupIndex(const QString& account, const QString&
         }
     }
 }
+
+void Models::Roster::onElementRequestArchive(const QString& before)
+{
+    Element* el = static_cast<Element*>(sender());
+    emit requestArchive(el->getAccountName(), el->getJid(), before);
+}
+
+void Models::Roster::responseArchive(const QString& account, const QString& jid, const std::list<Shared::Message>& list, bool last)
+{
+    ElId id(account, jid);
+    Element* el = getElement(id);
+    if (el != NULL) {
+        el->responseArchive(list, last);
+    }
+}
+
+void Models::Roster::fileProgress(const std::list<Shared::MessageInfo>& msgs, qreal value, bool up)
+{
+    for (const Shared::MessageInfo& info : msgs) {
+        Element* el = getElement({info.account, info.jid});
+        if (el != NULL) {
+            el->fileProgress(info.messageId, value, up);
+        }
+    }
+}
+
+void Models::Roster::fileComplete(const std::list<Shared::MessageInfo>& msgs, bool up)
+{
+    for (const Shared::MessageInfo& info : msgs) {
+        Element* el = getElement({info.account, info.jid});
+        if (el != NULL) {
+            el->fileComplete(info.messageId, up);
+        }
+    }
+}
+
+void Models::Roster::fileError(const std::list<Shared::MessageInfo>& msgs, const QString& err, bool up)
+{
+    for (const Shared::MessageInfo& info : msgs) {
+        Element* el = getElement({info.account, info.jid});
+        if (el != NULL) {
+            el->fileError(info.messageId, err, up);
+        }
+    }
+}
+
+Models::Element * Models::Roster::getElement(const Models::Roster::ElId& id)
+{
+    std::map<ElId, Contact*>::iterator cItr = contacts.find(id);
+    
+    if (cItr != contacts.end()) {
+        return cItr->second;
+    } else {
+        std::map<ElId, Room*>::iterator rItr = rooms.find(id);
+        if (rItr != rooms.end()) {
+            return rItr->second;
+        }
+    }
+    
+    return NULL;
+}
+
+void Models::Roster::onAccountReconnected()
+{
+    Account* acc = static_cast<Account*>(sender());
+    
+    QString accName = acc->getName();
+    for (const std::pair<const ElId, Contact*>& pair : contacts) {
+        if (pair.first.account == accName) {
+            pair.second->handleRecconnect();
+        }
+    }
+}
+

ui/models/roster.h

@@ -26,6 +26,7 @@
 
 #include "shared/message.h"
 #include "shared/global.h"
+#include "shared/messageinfo.h"
 #include "accounts.h"
 #include "item.h"
 #include "account.h"
@@ -58,7 +59,6 @@ public:
     void removePresence(const QString& account, const QString& jid, const QString& name);
     void addMessage(const QString& account, const Shared::Message& data);
     void changeMessage(const QString& account, const QString& jid, const QString& id, const QMap<QString, QVariant>& data);
-    void dropMessages(const QString& account, const QString& jid);
     void addRoom(const QString& account, const QString jid, const QMap<QString, QVariant>& data);
     void changeRoom(const QString& account, const QString jid, const QMap<QString, QVariant>& data);
     void removeRoom(const QString& account, const QString jid);
@@ -81,18 +81,26 @@ public:
     Account* getAccount(const QString& name);
     QModelIndex getAccountIndex(const QString& name);
     QModelIndex getGroupIndex(const QString& account, const QString& name);
+    void responseArchive(const QString& account, const QString& jid, const std::list<Shared::Message>& list, bool last);
+    
+    void fileProgress(const std::list<Shared::MessageInfo>& msgs, qreal value, bool up);
+    void fileError(const std::list<Shared::MessageInfo>& msgs, const QString& err, bool up);
+    void fileComplete(const std::list<Shared::MessageInfo>& msgs, bool up);
     
     Accounts* accountsModel;
     
+signals:
+    void requestArchive(const QString& account, const QString& jid, const QString& before);
+    void fileDownloadRequest(const QString& url);
+    void unnoticedMessage(const QString& account, const Shared::Message& msg);
+    void localPathInvalid(const QString& path);
+    
 private:
-    Item* root;
-    std::map<QString, Account*> accounts;
-    std::map<ElId, Group*> groups;
-    std::map<ElId, Contact*> contacts;
-    std::map<ElId, Room*> rooms;
+    Element* getElement(const ElId& id);
     
 private slots:
     void onAccountDataChanged(const QModelIndex& tl, const QModelIndex& br, const QVector<int>& roles);
+    void onAccountReconnected();
     void onChildChanged(Models::Item* item, int row, int col);
     void onChildIsAboutToBeInserted(Item* parent, int first, int last);
     void onChildInserted();
@@ -100,6 +108,14 @@ private slots:
     void onChildRemoved();
     void onChildIsAboutToBeMoved(Item* source, int first, int last, Item* destination, int newIndex);
     void onChildMoved();
+    void onElementRequestArchive(const QString& before);
+    
+private:
+    Item* root;
+    std::map<QString, Account*> accounts;
+    std::map<ElId, Group*> groups;
+    std::map<ElId, Contact*> contacts;
+    std::map<ElId, Room*> rooms;
     
 public:
     class ElId {

ui/squawk.cpp

@@ -29,7 +29,6 @@ Squawk::Squawk(QWidget *parent) :
     conversations(),
     contextMenu(new QMenu()),
     dbus("org.freedesktop.Notifications", "/org/freedesktop/Notifications", "org.freedesktop.Notifications", QDBusConnection::sessionBus()),
-    requestedFiles(),
     vCards(),
     requestedAccountsForPasswords(),
     prompt(0),
@@ -60,8 +59,12 @@ Squawk::Squawk(QWidget *parent) :
     connect(m_ui->roster, &QTreeView::customContextMenuRequested, this, &Squawk::onRosterContextMenu);
     connect(m_ui->roster, &QTreeView::collapsed, this, &Squawk::onItemCollepsed);
     connect(m_ui->roster->selectionModel(), &QItemSelectionModel::currentRowChanged, this, &Squawk::onRosterSelectionChanged);
+    connect(&rosterModel, &Models::Roster::unnoticedMessage, this, &Squawk::onUnnoticedMessage);
     
     connect(rosterModel.accountsModel, &Models::Accounts::sizeChanged, this, &Squawk::onAccountsSizeChanged);
+    connect(&rosterModel, &Models::Roster::requestArchive, this, &Squawk::onRequestArchive);
+    connect(&rosterModel, &Models::Roster::fileDownloadRequest, this, &Squawk::fileDownloadRequest);
+    connect(&rosterModel, &Models::Roster::localPathInvalid, this, &Squawk::localPathInvalid);
     connect(contextMenu, &QMenu::aboutToHide, this, &Squawk::onContextAboutToHide);
     //m_ui->mainToolBar->addWidget(m_ui->comboBox);
     
@@ -336,17 +339,14 @@ void Squawk::onRosterItemDoubleClicked(const QModelIndex& item)
             Models::Account* acc = rosterModel.getAccount(id->account);
             Conversation* conv = 0;
             bool created = false;
-            Models::Contact::Messages deque;
             if (itr != conversations.end()) {
                 conv = itr->second;
             } else if (contact != 0) {
                 created = true;
                 conv = new Chat(acc, contact);
-                contact->getMessages(deque);
             } else if (room != 0) {
                 created = true;
                 conv = new Room(acc, room);
-                room->getMessages(deque);
                 
                 if (!room->getJoined()) {
                     emit setRoomJoined(id->account, id->name, true);
@@ -358,12 +358,6 @@ void Squawk::onRosterItemDoubleClicked(const QModelIndex& item)
                     conv->setAttribute(Qt::WA_DeleteOnClose);
                     subscribeConversation(conv);
                     conversations.insert(std::make_pair(*id, conv));
-                    
-                    if (created) {
-                        for (Models::Contact::Messages::const_iterator itr = deque.begin(), end = deque.end(); itr != end; ++itr) {
-                            conv->addMessage(*itr);
-                        }
-                    }
                 }
                 
                 conv->show();
@@ -380,12 +374,6 @@ void Squawk::onRosterItemDoubleClicked(const QModelIndex& item)
     }
 }
 
-void Squawk::onConversationShown()
-{
-    Conversation* conv = static_cast<Conversation*>(sender());
-    rosterModel.dropMessages(conv->getAccount(), conv->getJid());
-}
-
 void Squawk::onConversationClosed(QObject* parent)
 {
     Conversation* conv = static_cast<Conversation*>(sender());
@@ -402,164 +390,40 @@ void Squawk::onConversationClosed(QObject* parent)
     }
 }
 
-void Squawk::onConversationDownloadFile(const QString& messageId, const QString& url)
+void Squawk::fileProgress(const std::list<Shared::MessageInfo> msgs, qreal value, bool up)
 {
-    Conversation* conv = static_cast<Conversation*>(sender());
-    std::map<QString, std::set<Models::Roster::ElId>>::iterator itr = requestedFiles.find(messageId);
-    bool created = false;
-    if (itr == requestedFiles.end()) {
-        itr = requestedFiles.insert(std::make_pair(messageId, std::set<Models::Roster::ElId>())).first;
-        created = true;
-    }
-    itr->second.insert(Models::Roster::ElId(conv->getAccount(), conv->getJid()));
-    if (created) {
-        emit downloadFileRequest(messageId, url);
-    }
+    rosterModel.fileProgress(msgs, value, up);
 }
 
-void Squawk::fileProgress(const QString& messageId, qreal value)
+void Squawk::fileDownloadComplete(const std::list<Shared::MessageInfo> msgs, const QString& path)
 {
-    std::map<QString, std::set<Models::Roster::ElId>>::const_iterator itr = requestedFiles.find(messageId);
-    if (itr == requestedFiles.end()) {
-        qDebug() << "fileProgress in UI Squawk but there is nobody waiting for that id" << messageId << ", skipping";
-        return;
-    } else {
-        const std::set<Models::Roster::ElId>& convs = itr->second;
-        for (std::set<Models::Roster::ElId>::const_iterator cItr = convs.begin(), cEnd = convs.end(); cItr != cEnd; ++cItr) {
-            const Models::Roster::ElId& id = *cItr;
-            Conversations::const_iterator c = conversations.find(id);
-            if (c != conversations.end()) {
-                c->second->responseFileProgress(messageId, value);
-            }
-            if (currentConversation != 0 && currentConversation->getId() == id) {
-                currentConversation->responseFileProgress(messageId, value);
-            }
-        }
-    }
+    rosterModel.fileComplete(msgs, false);
 }
 
-void Squawk::fileError(const QString& messageId, const QString& error)
+void Squawk::fileError(const std::list<Shared::MessageInfo> msgs, const QString& error, bool up)
 {
-    std::map<QString, std::set<Models::Roster::ElId>>::const_iterator itr = requestedFiles.find(messageId);
-    if (itr == requestedFiles.end()) {
-        qDebug() << "fileError in UI Squawk but there is nobody waiting for that id" << messageId << ", skipping";
-        return;
-    } else {
-        const std::set<Models::Roster::ElId>& convs = itr->second;
-        for (std::set<Models::Roster::ElId>::const_iterator cItr = convs.begin(), cEnd = convs.end(); cItr != cEnd; ++cItr) {
-            const Models::Roster::ElId& id = *cItr;
-            Conversations::const_iterator c = conversations.find(id);
-            if (c != conversations.end()) {
-                c->second->fileError(messageId, error);
-            }
-            if (currentConversation != 0 && currentConversation->getId() == id) {
-                currentConversation->fileError(messageId, error);
-            }
-        }
-        requestedFiles.erase(itr);
-    }
+    rosterModel.fileError(msgs, error, up);
 }
 
-void Squawk::fileLocalPathResponse(const QString& messageId, const QString& path)
+void Squawk::fileUploadComplete(const std::list<Shared::MessageInfo> msgs, const QString& path)
 {
-    std::map<QString, std::set<Models::Roster::ElId>>::const_iterator itr = requestedFiles.find(messageId);
-    if (itr == requestedFiles.end()) {
-        qDebug() << "fileLocalPathResponse in UI Squawk but there is nobody waiting for that path, skipping";
-        return;
-    } else {
-        const std::set<Models::Roster::ElId>& convs = itr->second;
-        for (std::set<Models::Roster::ElId>::const_iterator cItr = convs.begin(), cEnd = convs.end(); cItr != cEnd; ++cItr) {
-            const Models::Roster::ElId& id = *cItr;
-            Conversations::const_iterator c = conversations.find(id);
-            if (c != conversations.end()) {
-                c->second->responseLocalFile(messageId, path);
-            }
-            if (currentConversation != 0 && currentConversation->getId() == id) {
-                currentConversation->responseLocalFile(messageId, path);
-            }
-        }
-        
-        requestedFiles.erase(itr);
-    }
-}
-
-void Squawk::onConversationRequestLocalFile(const QString& messageId, const QString& url)
-{
-    Conversation* conv = static_cast<Conversation*>(sender());
-    std::map<QString, std::set<Models::Roster::ElId>>::iterator itr = requestedFiles.find(messageId);
-    bool created = false;
-    if (itr == requestedFiles.end()) {
-        itr = requestedFiles.insert(std::make_pair(messageId, std::set<Models::Roster::ElId>())).first;
-        created = true;
-    }
-    itr->second.insert(Models::Roster::ElId(conv->getAccount(), conv->getJid()));
-    if (created) {
-        emit fileLocalPathRequest(messageId, url);
-    }
+    rosterModel.fileComplete(msgs, true);
 }
 
 void Squawk::accountMessage(const QString& account, const Shared::Message& data)
 {
-    const QString& from = data.getPenPalJid();
-    Models::Roster::ElId id({account, from});
-    Conversations::iterator itr = conversations.find(id);
-    bool found = false;
-    
-    if (currentConversation != 0 && currentConversation->getId() == id) {
-        currentConversation->addMessage(data);
-        QApplication::alert(this);
-        if (!isVisible() && !data.getForwarded()) {
-            notify(account, data);
-        }
-        found = true;
-    }
-    
-    if (itr != conversations.end()) {
-        Conversation* conv = itr->second;
-        conv->addMessage(data);
-        QApplication::alert(conv);
-        if (!found && conv->isMinimized()) {
-            rosterModel.addMessage(account, data);
-        }
-        if (!conv->isVisible() && !data.getForwarded()) {
-            notify(account, data);
-        }
-        found = true;
-    }
-    
-    if (!found) {
-        rosterModel.addMessage(account, data);
-        if (!data.getForwarded()) {
-            QApplication::alert(this);
-            notify(account, data);
-        }
-    }
+    rosterModel.addMessage(account, data);
+}
+
+void Squawk::onUnnoticedMessage(const QString& account, const Shared::Message& msg)
+{
+    notify(account, msg);             //Telegram does this way - notifies even if the app is visible
+    QApplication::alert(this);
 }
 
 void Squawk::changeMessage(const QString& account, const QString& jid, const QString& id, const QMap<QString, QVariant>& data)
 {
-    Models::Roster::ElId eid({account, jid});
-    bool found = false;
-    
-    if (currentConversation != 0 && currentConversation->getId() == eid) {
-        currentConversation->changeMessage(id, data);
-        QApplication::alert(this);
-        found = true;
-    }
-    
-    Conversations::iterator itr = conversations.find(eid);
-    if (itr != conversations.end()) {
-        Conversation* conv = itr->second;
-        conv->changeMessage(id, data);
-        if (!found && conv->isMinimized()) {
-            rosterModel.changeMessage(account, jid, id, data);
-        }
-        found = true;
-    } 
-    
-    if (!found) {
-        rosterModel.changeMessage(account, jid, id, data);
-    }
+    rosterModel.changeMessage(account, jid, id, data);
 }
 
 void Squawk::notify(const QString& account, const Shared::Message& msg)
@@ -596,60 +460,29 @@ void Squawk::notify(const QString& account, const Shared::Message& msg)
 void Squawk::onConversationMessage(const Shared::Message& msg)
 {
     Conversation* conv = static_cast<Conversation*>(sender());
-    emit sendMessage(conv->getAccount(), msg);
-    Models::Roster::ElId id = conv->getId();
+    QString acc = conv->getAccount();
     
-    if (currentConversation != 0 && currentConversation->getId() == id) {
-        if (conv == currentConversation) {
-            Conversations::iterator itr = conversations.find(id);
-            if (itr != conversations.end()) {
-                itr->second->addMessage(msg);
-            }
-        } else {
-            currentConversation->addMessage(msg);
-        }
-    }
+    rosterModel.addMessage(acc, msg);
+    emit sendMessage(acc, msg);
 }
 
-void Squawk::onConversationMessage(const Shared::Message& msg, const QString& path)
+void Squawk::onConversationResend(const QString& id)
 {
     Conversation* conv = static_cast<Conversation*>(sender());
-    Models::Roster::ElId id = conv->getId();
-    std::map<QString, std::set<Models::Roster::ElId>>::iterator itr = requestedFiles.insert(std::make_pair(msg.getId(), std::set<Models::Roster::ElId>())).first;
-    itr->second.insert(id);
+    QString acc = conv->getAccount();
+    QString jid = conv->getJid();
     
-    if (currentConversation != 0 && currentConversation->getId() == id) {
-        if (conv == currentConversation) {
-            Conversations::iterator itr = conversations.find(id);
-            if (itr != conversations.end()) {
-                itr->second->appendMessageWithUpload(msg, path);
-            }
-        } else {
-            currentConversation->appendMessageWithUpload(msg, path);
-        }
-    }
-    
-    emit sendMessage(conv->getAccount(), msg, path);
+    emit resendMessage(acc, jid, id);
 }
 
-void Squawk::onConversationRequestArchive(const QString& before)
+void Squawk::onRequestArchive(const QString& account, const QString& jid, const QString& before)
 {
-    Conversation* conv = static_cast<Conversation*>(sender());
-    requestArchive(conv->getAccount(), conv->getJid(), 20, before); //TODO amount as a settings value
+    emit requestArchive(account, jid, 20, before); //TODO amount as a settings value
 }
 
-void Squawk::responseArchive(const QString& account, const QString& jid, const std::list<Shared::Message>& list)
+void Squawk::responseArchive(const QString& account, const QString& jid, const std::list<Shared::Message>& list, bool last)
 {
-    Models::Roster::ElId id(account, jid);
-    
-    if (currentConversation != 0 && currentConversation->getId() == id) {
-        currentConversation->responseArchive(list);
-    }
-    
-    Conversations::const_iterator itr = conversations.find(id);
-    if (itr != conversations.end()) {
-        itr->second->responseArchive(list);
-    }
+    rosterModel.responseArchive(account, jid, list, last);
 }
 
 void Squawk::removeAccount(const QString& account)
@@ -661,8 +494,6 @@ void Squawk::removeAccount(const QString& account)
             ++itr;
             Conversation* conv = lItr->second;
             disconnect(conv, &Conversation::destroyed, this, &Squawk::onConversationClosed);
-            disconnect(conv, &Conversation::requestArchive, this, &Squawk::onConversationRequestArchive);
-            disconnect(conv, &Conversation::shown, this, &Squawk::onConversationShown);
             conv->close();
             conversations.erase(lItr);
         } else {
@@ -926,7 +757,6 @@ void Squawk::onActivateVCard(const QString& account, const QString& jid, bool ed
 {
     std::map<QString, VCard*>::const_iterator itr = vCards.find(jid);
     VCard* card;
-    Models::Contact::Messages deque;
     if (itr != vCards.end()) {
         card = itr->second;
     } else {
@@ -1092,13 +922,9 @@ void Squawk::onPasswordPromptRejected()
 void Squawk::subscribeConversation(Conversation* conv)
 {
     connect(conv, &Conversation::destroyed, this, &Squawk::onConversationClosed);
-    connect(conv, qOverload<const Shared::Message&>(&Conversation::sendMessage), this, qOverload<const Shared::Message&>(&Squawk::onConversationMessage));
-    connect(conv, qOverload<const Shared::Message&, const QString&>(&Conversation::sendMessage), 
-            this, qOverload<const Shared::Message&, const QString&>(&Squawk::onConversationMessage));
-    connect(conv, &Conversation::requestArchive, this, &Squawk::onConversationRequestArchive);
-    connect(conv, &Conversation::requestLocalFile, this, &Squawk::onConversationRequestLocalFile);
-    connect(conv, &Conversation::downloadFile, this, &Squawk::onConversationDownloadFile);
-    connect(conv, &Conversation::shown, this, &Squawk::onConversationShown);
+    connect(conv, &Conversation::sendMessage, this, &Squawk::onConversationMessage);
+    connect(conv, &Conversation::resendMessage, this, &Squawk::onConversationResend);
+    connect(conv, &Conversation::notifyableMessage, this, &Squawk::notify);
 }
 
 void Squawk::onRosterSelectionChanged(const QModelIndex& current, const QModelIndex& previous)
@@ -1168,13 +994,10 @@ void Squawk::onRosterSelectionChanged(const QModelIndex& current, const QModelIn
             }
             
             Models::Account* acc = rosterModel.getAccount(id->account);
-            Models::Contact::Messages deque;
             if (contact != 0) {
                 currentConversation = new Chat(acc, contact);
-                contact->getMessages(deque);
             } else if (room != 0) {
                 currentConversation = new Room(acc, room);
-                room->getMessages(deque);
                 
                 if (!room->getJoined()) {
                     emit setRoomJoined(id->account, id->name, true);
@@ -1185,9 +1008,6 @@ void Squawk::onRosterSelectionChanged(const QModelIndex& current, const QModelIn
             }
             
             subscribeConversation(currentConversation);
-            for (Models::Contact::Messages::const_iterator itr = deque.begin(), end = deque.end(); itr != end; ++itr) {
-                currentConversation->addMessage(*itr);
-            }
             
             if (res.size() > 0) {
                 currentConversation->setPalResource(res);

ui/squawk.h

@@ -39,7 +39,7 @@
 #include "models/roster.h"
 #include "widgets/vcard/vcard.h"
 
-#include "shared.h"
+#include "shared/shared.h"
 
 namespace Ui {
 class Squawk;
@@ -63,7 +63,7 @@ signals:
     void disconnectAccount(const QString&);
     void changeState(Shared::Availability state);
     void sendMessage(const QString& account, const Shared::Message& data);
-    void sendMessage(const QString& account, const Shared::Message& data, const QString& path);
+    void resendMessage(const QString& account, const QString& jid, const QString& id);
     void requestArchive(const QString& account, const QString& jid, int count, const QString& before);
     void subscribeContact(const QString& account, const QString& jid, const QString& reason);
     void unsubscribeContact(const QString& account, const QString& jid, const QString& reason);
@@ -76,11 +76,11 @@ signals:
     void setRoomAutoJoin(const QString& account, const QString& jid, bool joined);
     void addRoomRequest(const QString& account, const QString& jid, const QString& nick, const QString& password, bool autoJoin);
     void removeRoomRequest(const QString& account, const QString& jid);
-    void fileLocalPathRequest(const QString& messageId, const QString& url);
-    void downloadFileRequest(const QString& messageId, const QString& url);
+    void fileDownloadRequest(const QString& url);
     void requestVCard(const QString& account, const QString& jid);
     void uploadVCard(const QString& account, const Shared::VCard& card);
     void responsePassword(const QString& account, const QString& password);
+    void localPathInvalid(const QString& path);
     
 public slots:
     void readSettings();
@@ -97,16 +97,17 @@ public slots:
     void removePresence(const QString& account, const QString& jid, const QString& name);
     void stateChanged(Shared::Availability state);
     void accountMessage(const QString& account, const Shared::Message& data);
-    void responseArchive(const QString& account, const QString& jid, const std::list<Shared::Message>& list);
+    void responseArchive(const QString& account, const QString& jid, const std::list<Shared::Message>& list, bool last);
     void addRoom(const QString& account, const QString jid, const QMap<QString, QVariant>& data);
     void changeRoom(const QString& account, const QString jid, const QMap<QString, QVariant>& data);
     void removeRoom(const QString& account, const QString jid);
     void addRoomParticipant(const QString& account, const QString& jid, const QString& name, const QMap<QString, QVariant>& data);
     void changeRoomParticipant(const QString& account, const QString& jid, const QString& name, const QMap<QString, QVariant>& data);
     void removeRoomParticipant(const QString& account, const QString& jid, const QString& name);
-    void fileLocalPathResponse(const QString& messageId, const QString& path);
-    void fileError(const QString& messageId, const QString& error);
-    void fileProgress(const QString& messageId, qreal value);
+    void fileError(const std::list<Shared::MessageInfo> msgs, const QString& error, bool up);
+    void fileProgress(const std::list<Shared::MessageInfo> msgs, qreal value, bool up);
+    void fileDownloadComplete(const std::list<Shared::MessageInfo> msgs, const QString& path);
+    void fileUploadComplete(const std::list<Shared::MessageInfo> msgs, const QString& path);
     void responseVCard(const QString& jid, const Shared::VCard& card);
     void changeMessage(const QString& account, const QString& jid, const QString& id, const QMap<QString, QVariant>& data);
     void requestPassword(const QString& account);
@@ -120,7 +121,6 @@ private:
     Conversations conversations;
     QMenu* contextMenu;
     QDBusInterface dbus;
-    std::map<QString, std::set<Models::Roster::ElId>> requestedFiles;
     std::map<QString, VCard*> vCards;
     std::deque<QString> requestedAccountsForPasswords;
     QInputDialog* prompt;
@@ -130,6 +130,8 @@ private:
     
 protected:
     void closeEvent(QCloseEvent * event) override;
+    
+protected slots:
     void notify(const QString& account, const Shared::Message& msg);
     
 private slots:
@@ -147,18 +149,17 @@ private slots:
     void onComboboxActivated(int index);
     void onRosterItemDoubleClicked(const QModelIndex& item);
     void onConversationMessage(const Shared::Message& msg);
-    void onConversationMessage(const Shared::Message& msg, const QString& path);
-    void onConversationRequestArchive(const QString& before);
+    void onConversationResend(const QString& id);
+    void onRequestArchive(const QString& account, const QString& jid, const QString& before);
     void onRosterContextMenu(const QPoint& point);
-    void onConversationShown();
-    void onConversationRequestLocalFile(const QString& messageId, const QString& url);
-    void onConversationDownloadFile(const QString& messageId, const QString& url);
     void onItemCollepsed(const QModelIndex& index);
     void onPasswordPromptAccepted();
     void onPasswordPromptRejected();
     void onRosterSelectionChanged(const QModelIndex& current, const QModelIndex& previous);
     void onContextAboutToHide();
     
+    void onUnnoticedMessage(const QString& account, const Shared::Message& msg);
+    
 private:
     void checkNextAccountForPassword();
     void onPasswordPromptDone();

ui/utils/CMakeLists.txt

@@ -0,0 +1,18 @@
+target_sources(squawk PRIVATE
+  badge.cpp
+  badge.h
+  comboboxdelegate.cpp
+  comboboxdelegate.h
+  exponentialblur.cpp
+  exponentialblur.h
+  flowlayout.cpp
+  flowlayout.h
+  image.cpp
+  image.h
+  progress.cpp
+  progress.h
+  resizer.cpp
+  resizer.h
+  shadowoverlay.cpp
+  shadowoverlay.h
+  )

ui/utils/comboboxdelegate.cpp

@@ -37,7 +37,7 @@ QWidget* ComboboxDelegate::createEditor(QWidget *parent, const QStyleOptionViewI
 {
     QComboBox *cb = new QComboBox(parent);
     
-    for (const std::pair<QString, QIcon> pair : entries) {
+    for (const std::pair<QString, QIcon>& pair : entries) {
         cb->addItem(pair.second, pair.first);
     }
     

ui/utils/dropshadoweffect.h

@@ -1,93 +0,0 @@
-/*
- * Squawk messenger. 
- * Copyright (C) 2019  Yury Gubich <blue@macaw.me>
- * 
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- * 
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- * 
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-#ifndef DROPSHADOWEFFECT_H
-#define DROPSHADOWEFFECT_H
-
-#include <QGraphicsEffect>
-#include <QPainter>
-#include <QPointF>
-#include <QColor>
-
-class PixmapFilter : public QObject
-{
-    Q_OBJECT
-public:
-    PixmapFilter(QObject *parent = nullptr);
-    virtual ~PixmapFilter() = 0;
-    
-    virtual QRectF boundingRectFor(const QRectF &rect) const;
-    virtual void draw(QPainter *painter, const QPointF &p, const QPixmap &src, const QRectF &srcRect = QRectF()) const = 0;
-};
-
-class PixmapDropShadowFilter : public PixmapFilter
-{
-    Q_OBJECT
-    
-public:
-    PixmapDropShadowFilter(QObject *parent = nullptr);
-    ~PixmapDropShadowFilter();
-    
-    void draw(QPainter *p, const QPointF &pos, const QPixmap &px, const QRectF &src = QRectF()) const override;
-    
-    qreal blurRadius() const;
-    void setBlurRadius(qreal radius);
-    
-    QColor color() const;
-    void setColor(const QColor &color);
-    
-    qreal thickness() const;
-    void setThickness(qreal thickness);
-    void setFrame(bool top, bool right, bool bottom, bool left);
-    
-protected:
-    QColor mColor;
-    qreal mRadius;
-    qreal mThickness;
-    bool top;
-    bool right;
-    bool bottom;
-    bool left;
-};
-
-class DropShadowEffect : public QGraphicsEffect
-{
-    Q_OBJECT
-public:
-    qreal blurRadius() const;
-    QColor color() const;
-    void setFrame(bool top, bool right, bool bottom, bool left);
-    void setThickness(qreal thickness);
-    
-signals:
-    void blurRadiusChanged(qreal blurRadius);
-    void colorChanged(const QColor &color);
-    
-public slots:
-    void setBlurRadius(qreal blurRadius);
-    void setColor(const QColor &color);
-    
-protected:
-    void draw(QPainter * painter) override;
-    
-protected:
-    PixmapDropShadowFilter filter;
-    
-};
-
-#endif // DROPSHADOWEFFECT_H

ui/utils/exponentialblur.cpp

@@ -16,8 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "dropshadoweffect.h"
-#include "QtMath"
+#include "exponentialblur.h"
 
 static const int tileSize = 32;
 template <class T>
@@ -574,128 +573,7 @@ void expblur(QImage &img, qreal radius, bool improvedQuality = false, int transp
     }
 }
 
-PixmapFilter::PixmapFilter(QObject* parent):QObject(parent) {}
-PixmapFilter::~PixmapFilter(){}
-QRectF PixmapFilter::boundingRectFor(const QRectF &rect) const {return rect;}
-
-PixmapDropShadowFilter::PixmapDropShadowFilter(QObject *parent):
-    PixmapFilter(parent),
-    mColor(63, 63, 63, 180),
-    mRadius(1),
-    mThickness(2),
-    top(true),
-    right(true),
-    bottom(true),
-    left(true){}
-
-PixmapDropShadowFilter::~PixmapDropShadowFilter() {}
-qreal PixmapDropShadowFilter::blurRadius() const {return mRadius;}
-void PixmapDropShadowFilter::setBlurRadius(qreal radius) {mRadius = radius;}
-QColor PixmapDropShadowFilter::color() const {return mColor;}
-void PixmapDropShadowFilter::setColor(const QColor &color) {mColor = color;}
-qreal PixmapDropShadowFilter::thickness() const {return mThickness;}
-void PixmapDropShadowFilter::setThickness(qreal thickness) {mThickness = thickness;}
-void PixmapDropShadowFilter::setFrame(bool ptop, bool pright, bool pbottom, bool pleft)
+void Utils::exponentialblur(QImage& img, qreal radius, bool improvedQuality, int transposed)
 {
-    top = ptop;
-    right = pright;
-    bottom = pbottom;
-    left = pleft;
-}
-
-void DropShadowEffect::setThickness(qreal thickness)
-{
-    if (filter.thickness() == thickness)
-        return;
-    
-    filter.setThickness(thickness);
-    update();
-}
-
-
-void PixmapDropShadowFilter::draw(QPainter *p, const QPointF &pos, const QPixmap &px, const QRectF &src) const
-{
-    if (px.isNull())
-        return;
-    
-    QImage tmp({px.width(), px.height() + int(mThickness)}, QImage::Format_ARGB32_Premultiplied);
-    tmp.setDevicePixelRatio(px.devicePixelRatioF());
-    tmp.fill(0);
-    QPainter tmpPainter(&tmp);
-    tmpPainter.setCompositionMode(QPainter::CompositionMode_Source);
-    if (top) {
-        QRectF shadow(0, 0, px.width(), mThickness);
-        tmpPainter.fillRect(shadow, mColor);
-    }
-    if (right) {
-        QRectF shadow(px.width() - mThickness, 0, mThickness, px.height());
-        tmpPainter.fillRect(shadow, mColor);
-    }
-    if (bottom) {
-        QRectF shadow(0, px.height() - mThickness, px.width(), mThickness * 2); //i have no idea why, but it leaves some unpainted stripe without some spare space 
-        tmpPainter.fillRect(shadow, mColor);
-    }
-    if (left) {
-        QRectF shadow(0, 0, mThickness, px.height());
-        tmpPainter.fillRect(shadow, mColor);
-    }
-    
-    expblur<12, 10, false>(tmp, mRadius, false, 0);
-    tmpPainter.end();
-    
-    // Draw the actual pixmap...
-    p->drawPixmap(pos, px, src);
-    
-    // draw the blurred drop shadow...
-    p->drawImage(pos, tmp);
-}
-
-qreal DropShadowEffect::blurRadius() const {return filter.blurRadius();}
-void DropShadowEffect::setBlurRadius(qreal blurRadius)
-{
-    if (qFuzzyCompare(filter.blurRadius(), blurRadius))
-        return;
-    
-    filter.setBlurRadius(blurRadius);
-    updateBoundingRect();
-    emit blurRadiusChanged(blurRadius);
-}
-
-void DropShadowEffect::setFrame(bool top, bool right, bool bottom, bool left)
-{
-    filter.setFrame(top, right, bottom, left);
-    update();
-}
-
-
-QColor DropShadowEffect::color() const {return filter.color();}
-void DropShadowEffect::setColor(const QColor &color)
-{
-    if (filter.color() == color)
-        return;
-    
-    filter.setColor(color);
-    update();
-    emit colorChanged(color);
-}
-
-void DropShadowEffect::draw(QPainter* painter)
-{
-    if (filter.blurRadius() <= 0 && filter.thickness() == 0) {
-        drawSource(painter);
-        return;
-    }
-    
-    PixmapPadMode mode = PadToEffectiveBoundingRect;
-    
-    // Draw pixmap in device coordinates to avoid pixmap scaling.
-    QPoint offset;
-    const QPixmap pixmap = sourcePixmap(Qt::DeviceCoordinates, &offset, mode);
-    if (pixmap.isNull())
-        return;
-    
-    QTransform restoreTransform = painter->worldTransform();
-    painter->setWorldTransform(QTransform());
-    filter.draw(painter, offset, pixmap);
-    painter->setWorldTransform(restoreTransform);
+    expblur<12, 10, false>(img, radius, improvedQuality, transposed);
 }

ui/utils/exponentialblur.h

@@ -0,0 +1,34 @@
+/*
+ * Squawk messenger. 
+ * Copyright (C) 2019  Yury Gubich <blue@macaw.me>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef EXPONENTIALBLUR_H
+#define EXPONENTIALBLUR_H
+
+#include <QObject>
+#include <QImage>
+#include <QtMath>
+
+/**
+ * @todo write docs
+ */
+
+namespace Utils {
+    void exponentialblur(QImage &img, qreal radius, bool improvedQuality = false, int transposed = 0);
+};
+
+#endif // EXPONENTIALBLUR_H

ui/utils/shadowoverlay.cpp

@@ -0,0 +1,91 @@
+/*
+ * Squawk messenger. 
+ * Copyright (C) 2019  Yury Gubich <blue@macaw.me>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "shadowoverlay.h"
+
+ShadowOverlay::ShadowOverlay(unsigned int r, unsigned int t, const QColor& c, QWidget* parent):
+    QWidget(parent),
+    top(false),
+    right(false),
+    bottom(false),
+    left(false),
+    thickness(t),
+    radius(r),
+    color(c),
+    shadow(1, 1, QImage::Format_ARGB32_Premultiplied)
+{
+    setAttribute(Qt::WA_NoSystemBackground);
+    setAttribute(Qt::WA_TransparentForMouseEvents);
+}
+
+void ShadowOverlay::paintEvent(QPaintEvent* event)
+{
+    QWidget::paintEvent(event);
+    
+    QPainter painter(this);
+    
+    painter.drawImage(0, 0, shadow);
+}
+
+void ShadowOverlay::resizeEvent(QResizeEvent* event)
+{
+    QWidget::resizeEvent(event);
+    
+    updateImage();
+}
+
+void ShadowOverlay::updateImage()
+{
+    int w = width();
+    int h = height();
+    shadow = QImage({w, h + int(thickness)}, QImage::Format_ARGB32_Premultiplied);
+    shadow.fill(0);
+    
+    QPainter tmpPainter(&shadow);
+    tmpPainter.setCompositionMode(QPainter::CompositionMode_Source);
+    if (top) {
+        QRectF shadow(0, 0, w, thickness);
+        tmpPainter.fillRect(shadow, color);
+    }
+    if (right) {
+        QRectF shadow(w - thickness, 0, thickness, h);
+        tmpPainter.fillRect(shadow, color);
+    }
+    if (bottom) {
+        QRectF shadow(0, h - thickness, w, thickness * 2); //i have no idea why, but it leaves some unpainted stripe without some spare space 
+        tmpPainter.fillRect(shadow, color);
+    }
+    if (left) {
+        QRectF shadow(0, 0, thickness, h);
+        tmpPainter.fillRect(shadow, color);
+    }
+    
+    Utils::exponentialblur(shadow, radius, false, 0);
+    tmpPainter.end();
+}
+
+void ShadowOverlay::setFrames(bool t, bool r, bool b, bool l)
+{
+    top = t;
+    right = r;
+    bottom = b;
+    left = l;
+    
+    updateImage();
+    update();
+}

ui/utils/shadowoverlay.h

@@ -0,0 +1,58 @@
+/*
+ * Squawk messenger. 
+ * Copyright (C) 2019  Yury Gubich <blue@macaw.me>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef SHADOWOVERLAY_H
+#define SHADOWOVERLAY_H
+
+#include <QWidget>
+#include <QImage>
+#include <QPainter>
+#include <QColor>
+#include <QPaintEvent>
+#include <QResizeEvent>
+
+#include <ui/utils/exponentialblur.h>
+
+/**
+ * @todo write docs
+ */
+class ShadowOverlay : public QWidget {
+    
+public:
+    ShadowOverlay(unsigned int radius = 10, unsigned int thickness = 1, const QColor& color = Qt::black, QWidget* parent = nullptr);
+    
+    void setFrames(bool top, bool right, bool bottom, bool left);
+    
+protected:
+    void updateImage();
+    
+    void paintEvent(QPaintEvent * event) override;
+    void resizeEvent(QResizeEvent * event) override;
+    
+private:
+    bool top;
+    bool right;
+    bool bottom;
+    bool left;
+    unsigned int thickness;
+    unsigned int radius;
+    QColor color;
+    QImage shadow;
+};
+
+#endif // SHADOWOVERLAY_H

ui/widgets/CMakeLists.txt

@@ -1,29 +1,24 @@
-cmake_minimum_required(VERSION 3.0)
-project(squawkWidgets)
-
-# Instruct CMake to run moc automatically when needed.
-set(CMAKE_AUTOMOC ON)
-# Instruct CMake to create code from Qt designer ui files
-set(CMAKE_AUTOUIC ON)
-
-# Find the QtWidgets library
-find_package(Qt5Widgets CONFIG REQUIRED)
+target_sources(squawk PRIVATE
+  account.cpp
+  account.h
+  account.ui
+  accounts.cpp
+  accounts.h
+  accounts.ui
+  chat.cpp
+  chat.h
+  conversation.cpp
+  conversation.h
+  conversation.ui
+  joinconference.cpp
+  joinconference.h
+  joinconference.ui
+  newcontact.cpp
+  newcontact.h
+  newcontact.ui
+  room.cpp
+  room.h
+  )
 
 add_subdirectory(vcard)
-
-set(squawkWidgets_SRC
-  conversation.cpp
-  chat.cpp
-  room.cpp
-  newcontact.cpp
-  accounts.cpp
-  account.cpp
-  joinconference.cpp
-)
-
-# Tell CMake to create the helloworld executable
-add_library(squawkWidgets ${squawkWidgets_SRC})
-
-# Use the Widgets module from Qt 5.
-target_link_libraries(squawkWidgets vCardUI)
-target_link_libraries(squawkWidgets Qt5::Widgets)
+add_subdirectory(messageline)

ui/widgets/chat.cpp

@@ -19,7 +19,7 @@
 #include "chat.h"
 
 Chat::Chat(Models::Account* acc, Models::Contact* p_contact, QWidget* parent):
-    Conversation(false, acc, p_contact->getJid(), "", parent),
+    Conversation(false, acc, p_contact, p_contact->getJid(), "", parent),
     contact(p_contact)
 {
     setName(p_contact->getContactName());
@@ -71,31 +71,14 @@ Shared::Message Chat::createMessage() const
     return msg;
 }
 
-void Chat::addMessage(const Shared::Message& data)
+void Chat::onMessage(const Shared::Message& data)
 {
-    Conversation::addMessage(data);
+    Conversation::onMessage(data);
     
-    if (!data.getOutgoing()) {                          //TODO need to check if that was the last message
+    if (!data.getOutgoing()) {
         const QString& res = data.getPenPalResource();
         if (res.size() > 0) {
             setPalResource(res);
         }
     }
 }
-
-void Chat::setName(const QString& name)
-{
-    Conversation::setName(name);
-    line->setPalName(getJid(), name);
-}
-
-void Chat::setAvatar(const QString& path)
-{
-    Conversation::setAvatar(path);
-    
-    if (path.size() == 0) {
-        line->dropPalAvatar(contact->getJid());
-    } else {
-        line->setPalAvatar(contact->getJid(), path);
-    }
-}

ui/widgets/chat.h

@@ -34,16 +34,13 @@ class Chat : public Conversation
 public:
     Chat(Models::Account* acc, Models::Contact* p_contact, QWidget* parent = 0);
     ~Chat();
-    
-    void addMessage(const Shared::Message & data) override;
-    void setAvatar(const QString& path) override;
 
 protected slots:
     void onContactChanged(Models::Item* item, int row, int col);
     
 protected:
-    void setName(const QString & name) override;
     Shared::Message createMessage() const override;
+    void onMessage(const Shared::Message& msg) override;
     
 private:
     void updateState();

ui/widgets/conversation.cpp

@@ -18,7 +18,6 @@
 
 #include "conversation.h"
 #include "ui_conversation.h"
-#include "ui/utils/dropshadoweffect.h"
 
 #include <QDebug>
 #include <QScrollBar>
@@ -29,31 +28,44 @@
 #include <QAbstractTextDocumentLayout>
 #include <QCoreApplication>
 
-Conversation::Conversation(bool muc, Models::Account* acc, const QString pJid, const QString pRes, QWidget* parent):
+Conversation::Conversation(bool muc, Models::Account* acc, Models::Element* el, const QString pJid, const QString pRes, QWidget* parent):
     QWidget(parent),
     isMuc(muc),
     account(acc),
+    element(el),
     palJid(pJid),
     activePalResource(pRes),
-    line(new MessageLine(muc)),
     m_ui(new Ui::Conversation()),
     ker(),
-    scrollResizeCatcher(),
-    vis(),
     thread(),
     statusIcon(0),
     statusLabel(0),
     filesLayout(0),
     overlay(new QWidget()),
     filesToAttach(),
-    scroll(down),
+    feed(new FeedView()),
+    delegate(new MessageDelegate(this)),
     manualSliderChange(false),
-    requestingHistory(false),
-    everShown(false),
-    tsb(QApplication::style()->styleHint(QStyle::SH_ScrollBar_Transient) == 1)
+    tsb(QApplication::style()->styleHint(QStyle::SH_ScrollBar_Transient) == 1),
+    shadow(10, 1, Qt::black, this),
+    contextMenu(new QMenu())
 {
     m_ui->setupUi(this);
     
+    shadow.setFrames(true, false, true, false);
+    
+    feed->setItemDelegate(delegate);
+    feed->setFrameShape(QFrame::NoFrame);
+    feed->setContextMenuPolicy(Qt::CustomContextMenu);
+    delegate->initializeFonts(feed->getFont());
+    feed->setModel(el->feed);
+    el->feed->incrementObservers();
+    m_ui->widget->layout()->addWidget(feed);
+    
+    connect(el->feed, &Models::MessageFeed::newMessage, this, &Conversation::onFeedMessage);
+    connect(feed, &FeedView::resized, this, &Conversation::positionShadow);
+    connect(feed, &FeedView::customContextMenuRequested, this, &Conversation::onFeedContext);
+    
     connect(acc, &Models::Account::childChanged, this, &Conversation::onAccountChanged);
     
     filesLayout = new FlowLayout(m_ui->filesPanel, 0);
@@ -63,14 +75,7 @@ Conversation::Conversation(bool muc, Models::Account* acc, const QString pJid, c
     statusLabel = m_ui->statusLabel;
     
     connect(&ker, &KeyEnterReceiver::enterPressed, this, &Conversation::onEnterPressed);
-    connect(&scrollResizeCatcher, &Resizer::resized, this, &Conversation::onScrollResize);
-    connect(&vis, &VisibilityCatcher::shown, this, &Conversation::onScrollResize);
-    connect(&vis, &VisibilityCatcher::hidden, this, &Conversation::onScrollResize);
     connect(m_ui->sendButton, &QPushButton::clicked, this, &Conversation::onEnterPressed);
-    connect(line, &MessageLine::resize, this, &Conversation::onMessagesResize);
-    connect(line, &MessageLine::downloadFile, this, &Conversation::downloadFile);
-    connect(line, &MessageLine::uploadFile, this, qOverload<const Shared::Message&, const QString&>(&Conversation::sendMessage));
-    connect(line, &MessageLine::requestLocalFile, this, &Conversation::requestLocalFile);
     connect(m_ui->attachButton, &QPushButton::clicked, this, &Conversation::onAttach);
     connect(m_ui->clearButton, &QPushButton::clicked, this, &Conversation::onClearButton);
     connect(m_ui->messageEditor->document()->documentLayout(), &QAbstractTextDocumentLayout::documentSizeChanged, 
@@ -78,23 +83,43 @@ Conversation::Conversation(bool muc, Models::Account* acc, const QString pJid, c
     
     m_ui->messageEditor->installEventFilter(&ker);
     
-    QScrollBar* vs = m_ui->scrollArea->verticalScrollBar();
-    m_ui->scrollArea->setWidget(line);
-    vs->installEventFilter(&vis);
     
-    line->setAutoFillBackground(false);
-    if (testAttribute(Qt::WA_TranslucentBackground)) {
-        m_ui->scrollArea->setAutoFillBackground(false);
-    } else {
-        m_ui->scrollArea->setBackgroundRole(QPalette::Base);
+    //line->setAutoFillBackground(false);
+    //if (testAttribute(Qt::WA_TranslucentBackground)) {
+        //m_ui->scrollArea->setAutoFillBackground(false);
+    //} else {
+        //m_ui->scrollArea->setBackgroundRole(QPalette::Base);
+    //}
+    
+    //line->setMyAvatarPath(acc->getAvatarPath());
+    //line->setMyName(acc->getName());
+    
+    initializeOverlay();
+}
+
+Conversation::~Conversation()
+{
+    delete contextMenu;
+    
+    element->feed->decrementObservers();
+}
+
+void Conversation::onAccountChanged(Models::Item* item, int row, int col)
+{
+    if (item == account) {
+        if (col == 2 && account->getState() == Shared::ConnectionState::connected) {        //to request the history when we're back online after reconnect
+            //if (!requestingHistory) {
+                //requestingHistory = true;
+                //line->showBusyIndicator();
+                //emit requestArchive("");
+                //scroll = down;
+            //}
+        }
     }
-    
-    connect(vs, &QScrollBar::valueChanged, this, &Conversation::onSliderValueChanged);
-    m_ui->scrollArea->installEventFilter(&scrollResizeCatcher);
-    
-    line->setMyAvatarPath(acc->getAvatarPath());
-    line->setMyName(acc->getName());
-    
+}
+
+void Conversation::initializeOverlay()
+{
     QGridLayout* gr = static_cast<QGridLayout*>(layout());
     QLabel* progressLabel = new QLabel(tr("Drop files here to attach them to your message"));
     gr->addWidget(overlay, 0, 0, 2, 1);
@@ -115,36 +140,6 @@ Conversation::Conversation(bool muc, Models::Account* acc, const QString pJid, c
     nl->addWidget(progressLabel);
     nl->addStretch();
     overlay->hide();
-    
-    applyVisualEffects();
-}
-
-Conversation::~Conversation()
-{
-}
-
-void Conversation::onAccountChanged(Models::Item* item, int row, int col)
-{
-    if (item == account) {
-        if (col == 2 && account->getState() == Shared::ConnectionState::connected) {
-            if (!requestingHistory) {
-                requestingHistory = true;
-                line->showBusyIndicator();
-                emit requestArchive("");
-                scroll = down;
-            }
-        }
-    }
-}
-
-void Conversation::applyVisualEffects()
-{
-    DropShadowEffect *e1 = new DropShadowEffect;
-    e1->setBlurRadius(10);
-    e1->setColor(Qt::black);
-    e1->setThickness(1);
-    e1->setFrame(true, false, true, false);
-    m_ui->scrollArea->setGraphicsEffect(e1);
 }
 
 void Conversation::setName(const QString& name)
@@ -163,22 +158,6 @@ QString Conversation::getJid() const
     return palJid;
 }
 
-void Conversation::addMessage(const Shared::Message& data)
-{
-    int pos = m_ui->scrollArea->verticalScrollBar()->sliderPosition();
-    int max = m_ui->scrollArea->verticalScrollBar()->maximum();
-    
-    MessageLine::Position place = line->message(data);
-    if (place == MessageLine::invalid) {
-        return;
-    }
-}
-
-void Conversation::changeMessage(const QString& id, const QMap<QString, QVariant>& data)
-{
-    line->changeMessage(id, data);
-}
-
 KeyEnterReceiver::KeyEnterReceiver(QObject* parent): QObject(parent), ownEvent(false) {}
 
 bool KeyEnterReceiver::eventFilter(QObject* obj, QEvent* event)
@@ -226,93 +205,19 @@ void Conversation::onEnterPressed()
         m_ui->messageEditor->clear();
         Shared::Message msg = createMessage();
         msg.setBody(body);
-        addMessage(msg);
         emit sendMessage(msg);
     }
     if (filesToAttach.size() > 0) {
         for (Badge* badge : filesToAttach) {
             Shared::Message msg = createMessage();
-            line->appendMessageWithUpload(msg, badge->id);
-            usleep(1000);       //this is required for the messages not to have equal time when appending into messageline
+            msg.setAttachPath(badge->id);
+            element->feed->registerUpload(msg.getId());
+            emit sendMessage(msg);
         }
-        clearAttachedFiles();
+         clearAttachedFiles();
     }
 }
 
-void Conversation::appendMessageWithUpload(const Shared::Message& data, const QString& path)
-{
-    line->appendMessageWithUploadNoSiganl(data, path);
-}
-
-void Conversation::onMessagesResize(int amount)
-{
-    manualSliderChange = true;
-    switch (scroll) {
-        case down:
-            m_ui->scrollArea->verticalScrollBar()->setValue(m_ui->scrollArea->verticalScrollBar()->maximum());
-            break;
-        case keep: {
-            int max = m_ui->scrollArea->verticalScrollBar()->maximum();
-            int value = m_ui->scrollArea->verticalScrollBar()->value() + amount;
-            m_ui->scrollArea->verticalScrollBar()->setValue(value);
-            
-            if (value == max) {
-                scroll = down;
-            } else {
-                scroll = nothing;
-            }
-        }
-            break;
-        default:
-            break;
-    }
-    manualSliderChange = false;
-}
-
-void Conversation::onSliderValueChanged(int value)
-{
-    if (!manualSliderChange) {
-        if (value == m_ui->scrollArea->verticalScrollBar()->maximum()) {
-            scroll = down;
-        } else {
-            if (!requestingHistory && value == 0) {
-                requestingHistory = true;
-                line->showBusyIndicator();
-                emit requestArchive(line->firstMessageId());
-                scroll = keep;
-            } else {
-                scroll = nothing;
-            }
-        }
-    }
-}
-
-void Conversation::responseArchive(const std::list<Shared::Message> list)
-{
-    requestingHistory = false;
-    scroll = keep;
-    
-    line->hideBusyIndicator();
-    for (std::list<Shared::Message>::const_iterator itr = list.begin(), end = list.end(); itr != end; ++itr) {
-        addMessage(*itr);
-    }
-}
-
-void Conversation::showEvent(QShowEvent* event)
-{
-    if (!everShown) {
-        everShown = true;
-        line->showBusyIndicator();
-        requestingHistory = true;
-        scroll = keep;
-        emit requestArchive(line->firstMessageId());
-    }
-    emit shown();
-    
-    QWidget::showEvent(event);
-    
-}
-
 void Conversation::onAttach()
 {
     QFileDialog* d = new QFileDialog(this, tr("Chose a file to send"));
@@ -340,34 +245,6 @@ void Conversation::setStatus(const QString& status)
     statusLabel->setText(Shared::processMessageBody(status));
 }
 
-void Conversation::onScrollResize()
-{
-    if (everShown) {
-        int size = m_ui->scrollArea->width();
-        QScrollBar* bar = m_ui->scrollArea->verticalScrollBar();
-        if (bar->isVisible() && !tsb) {
-            size -= bar->width();
-            
-        }
-        line->setMaximumWidth(size);
-    }
-}
-
-void Conversation::responseFileProgress(const QString& messageId, qreal progress)
-{
-    line->fileProgress(messageId, progress);
-}
-
-void Conversation::fileError(const QString& messageId, const QString& error)
-{
-    line->fileError(messageId, error);
-}
-
-void Conversation::responseLocalFile(const QString& messageId, const QString& path)
-{
-    line->responseLocalFile(messageId, path);
-}
-
 Models::Roster::ElId Conversation::getId() const
 {
     return {getAccount(), getJid()};
@@ -444,7 +321,7 @@ void Conversation::onTextEditDocSizeChanged(const QSizeF& size)
 
 void Conversation::setFeedFrames(bool top, bool right, bool bottom, bool left)
 {
-    static_cast<DropShadowEffect*>(m_ui->scrollArea->graphicsEffect())->setFrame(top, right, bottom, left);
+    shadow.setFrames(top, right, bottom, left);
 }
 
 void Conversation::dragEnterEvent(QDragEnterEvent* event)
@@ -504,21 +381,65 @@ Shared::Message Conversation::createMessage() const
     return msg;
 }
 
-bool VisibilityCatcher::eventFilter(QObject* obj, QEvent* event)
+void Conversation::onFeedMessage(const Shared::Message& msg)
 {
-    if (event->type() == QEvent::Show) {
-        emit shown();
-    }
-    
-    if (event->type() == QEvent::Hide) {
-        emit hidden();
-    }
-    
-    return false;
+    this->onMessage(msg);
 }
 
-VisibilityCatcher::VisibilityCatcher(QWidget* parent):
-QObject(parent)
+void Conversation::onMessage(const Shared::Message& msg)
 {
+    if (!msg.getForwarded()) {
+        QApplication::alert(this);
+        if (window()->windowState().testFlag(Qt::WindowMinimized)) {
+            emit notifyableMessage(getAccount(), msg);
+        }
+    }
 }
 
+void Conversation::positionShadow()
+{
+    int w = width();
+    int h = feed->height();
+    
+    shadow.resize(w, h);
+    shadow.move(feed->pos());
+    shadow.raise();
+}
+
+void Conversation::onFeedContext(const QPoint& pos)
+{
+    QModelIndex index = feed->indexAt(pos);
+    if (index.isValid()) {
+        Shared::Message* item = static_cast<Shared::Message*>(index.internalPointer());
+        
+        contextMenu->clear();
+        bool showMenu = false;
+        if (item->getState() == Shared::Message::State::error) {
+            showMenu = true;
+            QString id = item->getId();
+            QAction* resend = contextMenu->addAction(Shared::icon("view-refresh"), tr("Try sending again")); 
+            connect(resend, &QAction::triggered, [this, id]() {
+                element->feed->registerUpload(id);
+                emit resendMessage(id);
+            });
+        }
+        
+        QString path = item->getAttachPath();
+        if (path.size() > 0) {
+            showMenu = true;
+            QAction* open = contextMenu->addAction(Shared::icon("document-preview"), tr("Open")); 
+            connect(open, &QAction::triggered, [path]() {
+                QDesktopServices::openUrl(QUrl::fromLocalFile(path));
+            });
+            
+            QAction* show = contextMenu->addAction(Shared::icon("folder"), tr("Show in folder")); 
+            connect(show, &QAction::triggered, [path]() {
+                Shared::Global::highlightInFileManager(path);
+            });
+        }
+        
+        if (showMenu) {
+            contextMenu->popup(feed->viewport()->mapToGlobal(pos));
+        }
+    }
+}

ui/widgets/conversation.h

@@ -24,18 +24,26 @@
 #include <QMap>
 #include <QMimeData>
 #include <QFileInfo>
+#include <QGraphicsOpacityEffect>
+#include <QMenu>
+#include <QAction>
+#include <QDesktopServices>
 
 #include "shared/message.h"
-#include "order.h"
-#include "ui/models/account.h"
-#include "ui/models/roster.h"
-#include "ui/utils/messageline.h"
-#include "ui/utils/resizer.h"
-#include "ui/utils/flowlayout.h"
-#include "ui/utils/badge.h"
+#include "shared/order.h"
 #include "shared/icons.h"
 #include "shared/utils.h"
 
+#include "ui/models/account.h"
+#include "ui/models/roster.h"
+
+#include "ui/utils/flowlayout.h"
+#include "ui/utils/badge.h"
+#include "ui/utils/shadowoverlay.h"
+
+#include "ui/widgets/messageline/feedview.h"
+#include "ui/widgets/messageline/messagedelegate.h"
+
 namespace Ui
 {
 class Conversation;
@@ -54,54 +62,33 @@ signals:
     void enterPressed();
 };
 
-class VisibilityCatcher : public QObject {
-    Q_OBJECT
-public:
-    VisibilityCatcher(QWidget* parent = nullptr);
-    
-protected:
-    bool eventFilter(QObject* obj, QEvent* event) override;
-
-signals:
-    void hidden();
-    void shown();
-};
-
 class Conversation : public QWidget
 {
     Q_OBJECT
 public:
-    Conversation(bool muc, Models::Account* acc, const QString pJid, const QString pRes, QWidget* parent = 0);
+    Conversation(bool muc, Models::Account* acc, Models::Element* el, const QString pJid, const QString pRes, QWidget* parent = 0);
     ~Conversation();
     
     QString getJid() const;
     QString getAccount() const;
     QString getPalResource() const;
     Models::Roster::ElId getId() const;
-    virtual void addMessage(const Shared::Message& data);
     
     void setPalResource(const QString& res);
-    void responseArchive(const std::list<Shared::Message> list);
-    void showEvent(QShowEvent * event) override;
-    void responseLocalFile(const QString& messageId, const QString& path);
-    void fileError(const QString& messageId, const QString& error);
-    void responseFileProgress(const QString& messageId, qreal progress);
     virtual void setAvatar(const QString& path);
-    void changeMessage(const QString& id, const QMap<QString, QVariant>& data);
     void setFeedFrames(bool top, bool right, bool bottom, bool left);
-    virtual void appendMessageWithUpload(const Shared::Message& data, const QString& path);
     
 signals:
     void sendMessage(const Shared::Message& message);
-    void sendMessage(const Shared::Message& message, const QString& path);
+    void resendMessage(const QString& id);
     void requestArchive(const QString& before);
     void shown();
     void requestLocalFile(const QString& messageId, const QString& url);
     void downloadFile(const QString& messageId, const QString& url);
+    void notifyableMessage(const QString& account, const Shared::Message& msg);
     
 protected:
     virtual void setName(const QString& name);
-    void applyVisualEffects();
     virtual Shared::Message createMessage() const;
     void setStatus(const QString& status);
     void addAttachedFile(const QString& path);
@@ -110,47 +97,44 @@ protected:
     void dragEnterEvent(QDragEnterEvent* event) override;
     void dragLeaveEvent(QDragLeaveEvent* event) override;
     void dropEvent(QDropEvent* event) override;
+    void initializeOverlay();
+    virtual void onMessage(const Shared::Message& msg);
     
 protected slots:
     void onEnterPressed();
-    void onMessagesResize(int amount);
-    void onSliderValueChanged(int value);
     void onAttach();
     void onFileSelected();
-    void onScrollResize();
     void onBadgeClose();
     void onClearButton();
     void onTextEditDocSizeChanged(const QSizeF& size);
     void onAccountChanged(Models::Item* item, int row, int col);
+    void onFeedMessage(const Shared::Message& msg);
+    void positionShadow();
+    void onFeedContext(const QPoint &pos);
     
 public:
     const bool isMuc;
     
 protected:
-    enum Scroll {
-        nothing,
-        keep,
-        down
-    };
     Models::Account* account;
+    Models::Element* element;
     QString palJid;
     QString activePalResource;
-    MessageLine* line;
     QScopedPointer<Ui::Conversation> m_ui;
     KeyEnterReceiver ker;
-    Resizer scrollResizeCatcher;
-    VisibilityCatcher vis;
     QString thread;
     QLabel* statusIcon;
     QLabel* statusLabel;
     FlowLayout* filesLayout;
     QWidget* overlay;
     W::Order<Badge*, Badge::Comparator> filesToAttach;
-    Scroll scroll;
+    FeedView* feed;
+    MessageDelegate* delegate;
     bool manualSliderChange;
-    bool requestingHistory;
-    bool everShown;
     bool tsb;           //transient scroll bars
+    
+    ShadowOverlay shadow;
+    QMenu* contextMenu;
 };
 
 #endif // CONVERSATION_H

ui/widgets/conversation.ui

@@ -214,61 +214,7 @@
         </layout>
        </widget>
       </item>
-      <item>
-       <widget class="QScrollArea" name="scrollArea">
-        <property name="autoFillBackground">
-         <bool>true</bool>
-        </property>
-        <property name="frameShape">
-         <enum>QFrame::NoFrame</enum>
-        </property>
-        <property name="lineWidth">
-         <number>0</number>
-        </property>
-        <property name="midLineWidth">
-         <number>0</number>
-        </property>
-        <property name="horizontalScrollBarPolicy">
-         <enum>Qt::ScrollBarAlwaysOff</enum>
-        </property>
-        <property name="sizeAdjustPolicy">
-         <enum>QAbstractScrollArea::AdjustIgnored</enum>
-        </property>
-        <property name="widgetResizable">
-         <bool>true</bool>
-        </property>
-        <widget class="QWidget" name="scrollAreaWidgetContents">
-         <property name="geometry">
-          <rect>
-           <x>0</x>
-           <y>0</y>
-           <width>520</width>
-           <height>385</height>
-          </rect>
-         </property>
-         <layout class="QHBoxLayout" name="horizontalLayout_2">
-          <property name="spacing">
-           <number>0</number>
-          </property>
-          <property name="leftMargin">
-           <number>0</number>
-          </property>
-          <property name="topMargin">
-           <number>0</number>
-          </property>
-          <property name="rightMargin">
-           <number>0</number>
-          </property>
-          <property name="bottomMargin">
-           <number>0</number>
-          </property>
-         </layout>
-        </widget>
-       </widget>
-      </item>
      </layout>
-     <zorder>scrollArea</zorder>
-     <zorder>widget_3</zorder>
     </widget>
    </item>
    <item row="1" column="0">

ui/widgets/messageline/CMakeLists.txt

@@ -0,0 +1,14 @@
+target_sources(squawk PRIVATE
+  messagedelegate.cpp
+  messagedelegate.h
+  #messageline.cpp
+  #messageline.h
+  preview.cpp
+  preview.h
+  messagefeed.cpp
+  messagefeed.h
+  feedview.cpp
+  feedview.h
+  #message.cpp
+  #message.h
+  )

ui/widgets/messageline/feedview.cpp

@@ -0,0 +1,434 @@
+/*
+ * Squawk messenger. 
+ * Copyright (C) 2019  Yury Gubich <blue@macaw.me>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "feedview.h"
+
+#include <QPaintEvent>
+#include <QPainter>
+#include <QScrollBar>
+#include <QDebug>
+
+#include "messagedelegate.h"
+#include "messagefeed.h"
+
+constexpr int maxMessageHeight = 10000;
+constexpr int approximateSingleMessageHeight = 20;
+constexpr int progressSize = 70;
+
+const std::set<int> FeedView::geometryChangingRoles = {
+    Models::MessageFeed::Attach,
+    Models::MessageFeed::Text,
+    Models::MessageFeed::Id,
+    Models::MessageFeed::Error,
+    Models::MessageFeed::Date
+};
+
+FeedView::FeedView(QWidget* parent):
+    QAbstractItemView(parent),
+    hints(),
+    vo(0),
+    specialDelegate(false),
+    specialModel(false),
+    clearWidgetsMode(false),
+    modelState(Models::MessageFeed::complete),
+    progress()
+{
+    horizontalScrollBar()->setRange(0, 0);
+    verticalScrollBar()->setSingleStep(approximateSingleMessageHeight);
+    setMouseTracking(true);
+    setSelectionBehavior(SelectItems);
+//     viewport()->setAttribute(Qt::WA_Hover, true);
+    
+    progress.setParent(viewport());
+    progress.resize(progressSize, progressSize);
+}
+
+FeedView::~FeedView()
+{
+}
+
+QModelIndex FeedView::indexAt(const QPoint& point) const
+{
+    int32_t vh = viewport()->height();
+    uint32_t y = vh - point.y() + vo;
+    
+    for (std::deque<Hint>::size_type i = 0; i < hints.size(); ++i) {
+        const Hint& hint = hints[i];
+        if (y <= hint.offset + hint.height) {
+            if (y > hint.offset) {
+                return model()->index(i, 0, rootIndex());
+            } else {
+                break;
+            }
+        }
+    }
+    
+    return QModelIndex();
+}
+
+void FeedView::scrollTo(const QModelIndex& index, QAbstractItemView::ScrollHint hint)
+{
+}
+
+QRect FeedView::visualRect(const QModelIndex& index) const
+{
+    unsigned int row = index.row();
+    if (!index.isValid() || row >= hints.size()) {
+        qDebug() << "visualRect for" << row;
+        return QRect();
+    } else {
+        const Hint& hint = hints.at(row);
+        const QWidget* vp = viewport();
+        return QRect(0, vp->height() - hint.height - hint.offset + vo, vp->width(), hint.height);
+    }
+}
+
+int FeedView::horizontalOffset() const
+{
+    return 0;
+}
+
+bool FeedView::isIndexHidden(const QModelIndex& index) const
+{
+    return false;
+}
+
+QModelIndex FeedView::moveCursor(QAbstractItemView::CursorAction cursorAction, Qt::KeyboardModifiers modifiers)
+{
+    return QModelIndex();
+}
+
+void FeedView::setSelection(const QRect& rect, QItemSelectionModel::SelectionFlags command)
+{
+}
+
+int FeedView::verticalOffset() const
+{
+    return vo;
+}
+
+QRegion FeedView::visualRegionForSelection(const QItemSelection& selection) const
+{
+    return QRegion();
+}
+
+void FeedView::rowsInserted(const QModelIndex& parent, int start, int end)
+{
+    QAbstractItemView::rowsInserted(parent, start, end);
+    
+    scheduleDelayedItemsLayout();
+}
+
+void FeedView::dataChanged(const QModelIndex& topLeft, const QModelIndex& bottomRight, const QVector<int>& roles)
+{
+    if (specialDelegate) {
+        for (int role : roles) {
+            if (geometryChangingRoles.count(role) != 0) {
+                scheduleDelayedItemsLayout();                         //to recalculate layout only if there are some geometry changing modifications
+                break;
+            }
+        }
+    }
+    QAbstractItemView::dataChanged(topLeft, bottomRight, roles);
+}
+
+void FeedView::updateGeometries()
+{
+    qDebug() << "updateGeometries";
+    QScrollBar* bar = verticalScrollBar();
+    
+    const QStyle* st = style();
+    const QAbstractItemModel* m = model();
+    QSize layoutBounds = maximumViewportSize();
+    QStyleOptionViewItem option = viewOptions();
+    option.rect.setHeight(maxMessageHeight);
+    option.rect.setWidth(layoutBounds.width());
+    int frameAroundContents = 0;
+    int verticalScrollBarExtent = st->pixelMetric(QStyle::PM_ScrollBarExtent, 0, bar);
+    
+    bool layedOut = false;
+    if (verticalScrollBarExtent != 0 && verticalScrollBarPolicy() == Qt::ScrollBarAsNeeded && m->rowCount() * approximateSingleMessageHeight < layoutBounds.height()) {
+        hints.clear();
+        layedOut = tryToCalculateGeometriesWithNoScrollbars(option, m, layoutBounds.height());
+    }
+    
+    if (layedOut) {
+        bar->setRange(0, 0);
+        vo = 0;
+    } else {
+        int verticalMargin = 0;
+        if (st->styleHint(QStyle::SH_ScrollView_FrameOnlyAroundContents)) {
+            frameAroundContents = st->pixelMetric(QStyle::PM_DefaultFrameWidth) * 2;
+        }
+        
+        if (verticalScrollBarPolicy() == Qt::ScrollBarAsNeeded) {
+            verticalMargin = verticalScrollBarExtent + frameAroundContents;
+        }
+        
+        layoutBounds.rwidth() -= verticalMargin;
+        
+        option.features |= QStyleOptionViewItem::WrapText;
+        option.rect.setWidth(layoutBounds.width());
+        
+        hints.clear();
+        uint32_t previousOffset = 0;
+        for (int i = 0, size = m->rowCount(); i < size; ++i) {
+            QModelIndex index = m->index(i, 0, rootIndex());
+            int height = itemDelegate(index)->sizeHint(option, index).height();
+            hints.emplace_back(Hint({
+                false,
+                previousOffset,
+                static_cast<uint32_t>(height)
+            }));
+            previousOffset += height;
+        }
+        
+        int totalHeight = previousOffset - layoutBounds.height();
+        if (modelState != Models::MessageFeed::complete) {
+            totalHeight += progressSize;
+        }
+        vo = qMax(qMin(vo, totalHeight), 0);
+        bar->setRange(0, totalHeight);
+        bar->setPageStep(layoutBounds.height());
+        bar->setValue(totalHeight - vo);
+    }
+    
+    positionProgress();
+    
+    if (specialDelegate) {
+        clearWidgetsMode = true;
+    }
+    
+    
+    QAbstractItemView::updateGeometries();
+}
+
+bool FeedView::tryToCalculateGeometriesWithNoScrollbars(const QStyleOptionViewItem& option, const QAbstractItemModel* m, uint32_t totalHeight)
+{
+    uint32_t previousOffset = 0;
+    bool success = true;
+    for (int i = 0, size = m->rowCount(); i < size; ++i) {
+        QModelIndex index = m->index(i, 0, rootIndex());
+        int height = itemDelegate(index)->sizeHint(option, index).height();
+        
+        if (previousOffset + height > totalHeight) {
+            success = false;
+            break;
+        }
+        hints.emplace_back(Hint({
+            false,
+            previousOffset,
+            static_cast<uint32_t>(height)
+        }));
+        previousOffset += height;
+    }
+    
+    return success;
+}
+
+
+void FeedView::paintEvent(QPaintEvent* event)
+{
+    //qDebug() << "paint" << event->rect();
+    const QAbstractItemModel* m = model();
+    QWidget* vp = viewport();
+    QRect zone = event->rect().translated(0, -vo);
+    uint32_t vph = vp->height(); 
+    int32_t y1 = zone.y();
+    int32_t y2 = y1 + zone.height();
+    
+    bool inZone = false;
+    std::deque<QModelIndex> toRener;
+    for (std::deque<Hint>::size_type i = 0; i < hints.size(); ++i) {
+        const Hint& hint = hints[i];
+        int32_t relativeY1 = vph - hint.offset - hint.height;
+        if (!inZone) {
+            if (y2 > relativeY1) {
+                inZone = true;
+            }
+        }
+        if (inZone) {
+            toRener.emplace_back(m->index(i, 0, rootIndex()));
+        }
+        if (y1 > relativeY1) {
+            break;
+        }
+    }
+    
+    QPainter painter(vp);
+    QStyleOptionViewItem option = viewOptions();
+    option.features = QStyleOptionViewItem::WrapText;
+    QPoint cursor = vp->mapFromGlobal(QCursor::pos());
+    
+    if (specialDelegate) {
+        MessageDelegate* del = static_cast<MessageDelegate*>(itemDelegate());
+        if (clearWidgetsMode) {
+            del->beginClearWidgets();
+        }
+    }
+    
+    for (const QModelIndex& index : toRener) {
+        option.rect = visualRect(index);
+        bool mouseOver = option.rect.contains(cursor) && vp->rect().contains(cursor);
+        option.state.setFlag(QStyle::State_MouseOver, mouseOver);
+        itemDelegate(index)->paint(&painter, option, index);
+    }
+    
+    if (clearWidgetsMode && specialDelegate) {
+        MessageDelegate* del = static_cast<MessageDelegate*>(itemDelegate());
+        del->endClearWidgets();
+        clearWidgetsMode = false;
+    }
+    
+    if (event->rect().height() == vp->height()) {
+        // draw the blurred drop shadow...
+    }
+}
+
+void FeedView::verticalScrollbarValueChanged(int value)
+{
+    vo = verticalScrollBar()->maximum() - value;
+    
+    positionProgress();
+    
+    if (specialDelegate) {
+        clearWidgetsMode = true;
+    }
+    
+    if (modelState == Models::MessageFeed::incomplete && value < progressSize) {
+        model()->fetchMore(rootIndex());
+    }
+    
+    QAbstractItemView::verticalScrollbarValueChanged(vo);
+}
+
+void FeedView::mouseMoveEvent(QMouseEvent* event)
+{
+    if (!isVisible()) {
+        return;
+    }
+    
+    QAbstractItemView::mouseMoveEvent(event);
+}
+
+void FeedView::resizeEvent(QResizeEvent* event)
+{
+    QAbstractItemView::resizeEvent(event);
+    
+    positionProgress();
+    emit resized();
+}
+
+void FeedView::positionProgress()
+{
+    QSize layoutBounds = maximumViewportSize();
+    int progressPosition = layoutBounds.height() - progressSize;
+    std::deque<Hint>::size_type size = hints.size();
+    if (size > 0) {
+        const Hint& hint = hints[size - 1];
+        progressPosition -= hint.offset + hint.height;
+    }
+    progressPosition += vo;
+    progressPosition = qMin(progressPosition, 0);
+    
+    progress.move((width() - progressSize) / 2, progressPosition);
+}
+
+QFont FeedView::getFont() const
+{
+    return viewOptions().font;
+}
+
+void FeedView::setItemDelegate(QAbstractItemDelegate* delegate)
+{
+    if (specialDelegate) {
+        MessageDelegate* del = static_cast<MessageDelegate*>(itemDelegate());
+        disconnect(del, &MessageDelegate::buttonPushed, this, &FeedView::onMessageButtonPushed);
+        disconnect(del, &MessageDelegate::invalidPath, this, &FeedView::onMessageInvalidPath);
+    }
+    
+    QAbstractItemView::setItemDelegate(delegate);
+    
+    MessageDelegate* del = dynamic_cast<MessageDelegate*>(delegate);
+    if (del) {
+        specialDelegate = true;
+        connect(del, &MessageDelegate::buttonPushed, this, &FeedView::onMessageButtonPushed);
+        connect(del, &MessageDelegate::invalidPath, this, &FeedView::onMessageInvalidPath);
+    } else {
+        specialDelegate = false;
+    }
+}
+
+void FeedView::setModel(QAbstractItemModel* p_model)
+{
+    if (specialModel) {
+        Models::MessageFeed* feed = static_cast<Models::MessageFeed*>(model());
+        disconnect(feed, &Models::MessageFeed::syncStateChange, this, &FeedView::onModelSyncStateChange);
+    }
+    
+    QAbstractItemView::setModel(p_model);
+    
+    Models::MessageFeed* feed = dynamic_cast<Models::MessageFeed*>(p_model);
+    if (feed) {
+        onModelSyncStateChange(feed->getSyncState());
+        specialModel = true;
+        connect(feed, &Models::MessageFeed::syncStateChange, this, &FeedView::onModelSyncStateChange);
+    } else {
+        onModelSyncStateChange(Models::MessageFeed::complete);
+        specialModel = false;
+    }
+}
+
+void FeedView::onMessageButtonPushed(const QString& messageId)
+{
+    if (specialModel) {
+        Models::MessageFeed* feed = static_cast<Models::MessageFeed*>(model());
+        feed->downloadAttachment(messageId);
+    }
+}
+
+void FeedView::onMessageInvalidPath(const QString& messageId)
+{
+    if (specialModel) {
+        Models::MessageFeed* feed = static_cast<Models::MessageFeed*>(model());
+        feed->reportLocalPathInvalid(messageId);
+    }
+}
+
+void FeedView::onModelSyncStateChange(Models::MessageFeed::SyncState state)
+{
+    bool needToUpdateGeometry = false;
+    if (modelState != state) {
+        if (state == Models::MessageFeed::complete || modelState == Models::MessageFeed::complete) {
+            needToUpdateGeometry = true;
+        }
+        modelState = state;
+        
+        if (state == Models::MessageFeed::syncing) {
+            progress.show();
+            progress.start();
+        } else {
+            progress.stop();
+            progress.hide();
+        }
+    }
+    
+    if (needToUpdateGeometry) {
+        scheduleDelayedItemsLayout();
+    }
+}

ui/widgets/messageline/feedview.h

@@ -0,0 +1,95 @@
+/*
+ * Squawk messenger. 
+ * Copyright (C) 2019  Yury Gubich <blue@macaw.me>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef FEEDVIEW_H
+#define FEEDVIEW_H
+
+#include <QAbstractItemView>
+
+#include <deque>
+#include <set>
+
+#include <ui/widgets/messageline/messagefeed.h>
+#include <ui/utils/progress.h>
+
+/**
+ * @todo write docs
+ */
+class FeedView : public QAbstractItemView
+{
+    Q_OBJECT
+public:
+    FeedView(QWidget* parent = nullptr);
+    ~FeedView();
+    
+    QModelIndex indexAt(const QPoint & point) const override;
+    void scrollTo(const QModelIndex & index, QAbstractItemView::ScrollHint hint) override;
+    QRect visualRect(const QModelIndex & index) const override;
+    bool isIndexHidden(const QModelIndex & index) const override;
+    QModelIndex moveCursor(QAbstractItemView::CursorAction cursorAction, Qt::KeyboardModifiers modifiers) override;
+    void setSelection(const QRect & rect, QItemSelectionModel::SelectionFlags command) override;
+    QRegion visualRegionForSelection(const QItemSelection & selection) const override;
+    void setItemDelegate(QAbstractItemDelegate* delegate);
+    void setModel(QAbstractItemModel * model) override;
+    
+    QFont getFont() const;
+    
+signals:
+    void resized();
+    
+public slots:
+    
+protected slots:
+    void rowsInserted(const QModelIndex & parent, int start, int end) override;
+    void verticalScrollbarValueChanged(int value) override;
+    void dataChanged(const QModelIndex & topLeft, const QModelIndex & bottomRight, const QVector<int> & roles) override;
+    void onMessageButtonPushed(const QString& messageId);
+    void onMessageInvalidPath(const QString& messageId);
+    void onModelSyncStateChange(Models::MessageFeed::SyncState state);
+    
+protected:
+    int verticalOffset() const override;
+    int horizontalOffset() const override;
+    void paintEvent(QPaintEvent * event) override;
+    void updateGeometries() override;
+    void mouseMoveEvent(QMouseEvent * event) override;
+    void resizeEvent(QResizeEvent * event) override;
+    
+private:
+    bool tryToCalculateGeometriesWithNoScrollbars(const QStyleOptionViewItem& option, const QAbstractItemModel* model, uint32_t totalHeight);
+    void positionProgress();
+    
+private:
+    struct Hint {
+        bool dirty;
+        uint32_t offset;
+        uint32_t height;
+    };
+    std::deque<Hint> hints;
+    int vo;
+    bool specialDelegate;
+    bool specialModel;
+    bool clearWidgetsMode;
+    Models::MessageFeed::SyncState modelState;
+    Progress progress;
+    
+    static const std::set<int> geometryChangingRoles;
+    
+};
+
+#endif //FEEDVIEW_H

ui/widgets/messageline/messagedelegate.cpp

@@ -0,0 +1,579 @@
+/*
+ * Squawk messenger. 
+ * Copyright (C) 2019  Yury Gubich <blue@macaw.me>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <QDebug>
+#include <QPainter>
+#include <QApplication>
+#include <QMouseEvent>
+
+#include "messagedelegate.h"
+#include "messagefeed.h"
+
+constexpr int avatarHeight = 50;
+constexpr int margin = 6;
+constexpr int textMargin = 2;
+constexpr int statusIconSize = 16;
+
+MessageDelegate::MessageDelegate(QObject* parent):
+    QStyledItemDelegate(parent),
+    bodyFont(),
+    nickFont(),
+    dateFont(),
+    bodyMetrics(bodyFont),
+    nickMetrics(nickFont),
+    dateMetrics(dateFont),
+    buttonHeight(0),
+    barHeight(0),
+    buttons(new std::map<QString, FeedButton*>()),
+    bars(new std::map<QString, QProgressBar*>()),
+    statusIcons(new std::map<QString, QLabel*>()),
+    pencilIcons(new std::map<QString, QLabel*>()),
+    bodies(new std::map<QString, QLabel*>()),
+    previews(new std::map<QString, Preview*>()),
+    idsToKeep(new std::set<QString>()),
+    clearingWidgets(false)
+{
+    QPushButton btn;
+    buttonHeight = btn.sizeHint().height();
+    
+    QProgressBar bar;
+    barHeight = bar.sizeHint().height();
+}
+
+MessageDelegate::~MessageDelegate()
+{
+    for (const std::pair<const QString, FeedButton*>& pair: *buttons){
+        delete pair.second;
+    }
+    
+    for (const std::pair<const QString, QProgressBar*>& pair: *bars){
+        delete pair.second;
+    }
+    
+    for (const std::pair<const QString, QLabel*>& pair: *statusIcons){
+        delete pair.second;
+    }
+    
+    for (const std::pair<const QString, QLabel*>& pair: *pencilIcons){
+        delete pair.second;
+    }
+    
+    for (const std::pair<const QString, QLabel*>& pair: *bodies){
+        delete pair.second;
+    }
+    
+    for (const std::pair<const QString, Preview*>& pair: *previews){
+        delete pair.second;
+    }
+    
+    delete statusIcons;
+    delete pencilIcons;
+    delete idsToKeep;
+    delete buttons;
+    delete bars;
+    delete bodies;
+    delete previews;
+}
+
+void MessageDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const
+{
+    QVariant vi = index.data(Models::MessageFeed::Bulk);
+    if (!vi.isValid()) {
+        return;
+    }
+    Models::FeedItem data = qvariant_cast<Models::FeedItem>(vi);
+    painter->save();
+    painter->setRenderHint(QPainter::Antialiasing, true);
+    
+    if (option.state & QStyle::State_MouseOver) {
+        painter->fillRect(option.rect, option.palette.brush(QPalette::Inactive, QPalette::Highlight));
+    }
+    
+    QIcon icon(data.avatar);
+    
+    if (data.sentByMe) {
+        painter->drawPixmap(option.rect.width() - avatarHeight - margin,  option.rect.y() + margin / 2, icon.pixmap(avatarHeight, avatarHeight));
+    } else {
+        painter->drawPixmap(margin, option.rect.y() + margin / 2, icon.pixmap(avatarHeight, avatarHeight));
+    }
+    
+    QStyleOptionViewItem opt = option;
+    QRect messageRect = option.rect.adjusted(margin, margin / 2, -(avatarHeight + 2 * margin), -margin / 2);
+    if (!data.sentByMe) {
+        opt.displayAlignment = Qt::AlignLeft | Qt::AlignTop;
+        messageRect.adjust(avatarHeight + margin, 0, avatarHeight + margin, 0);
+    } else {
+        opt.displayAlignment = Qt::AlignRight | Qt::AlignTop;
+    }
+    opt.rect = messageRect;
+    
+    QSize messageSize(0, 0);
+    QSize bodySize(0, 0);
+    if (data.text.size() > 0) {
+        messageSize = bodyMetrics.boundingRect(messageRect, Qt::TextWordWrap, data.text).size();
+        bodySize = messageSize;
+    }
+    messageSize.rheight() += nickMetrics.lineSpacing();
+    messageSize.rheight() += dateMetrics.height();
+    if (messageSize.width() < opt.rect.width()) {
+        QSize senderSize = nickMetrics.boundingRect(messageRect, 0, data.sender).size();
+        if (senderSize.width() > messageSize.width()) {
+            messageSize.setWidth(senderSize.width());
+        }
+        QSize dateSize = dateMetrics.boundingRect(messageRect, 0, data.date.toLocalTime().toString()).size();
+        int addition = 0;
+        
+        if (data.correction.corrected) {
+            addition += margin + statusIconSize;
+        }
+        if (data.sentByMe) {
+            addition += margin + statusIconSize;
+        }
+        if (dateSize.width() + addition > messageSize.width()) {
+            messageSize.setWidth(dateSize.width() + addition);
+        }
+    } else {
+        messageSize.setWidth(opt.rect.width());
+    }
+    
+    QRect rect;
+    painter->setFont(nickFont);
+    painter->drawText(opt.rect, opt.displayAlignment, data.sender, &rect);
+    opt.rect.adjust(0, rect.height() + textMargin, 0, 0);
+    painter->save();
+    switch (data.attach.state) {
+        case Models::none:
+            clearHelperWidget(data);        //i can't imagine the situation where it's gonna be needed
+            break;                          //but it's a possible performance problem
+        case Models::uploading:
+            paintPreview(data, painter, opt);
+        case Models::downloading:
+            paintBar(getBar(data), painter, data.sentByMe, opt);
+            break;
+        case Models::remote:
+            paintButton(getButton(data), painter, data.sentByMe, opt);
+            break;
+        case Models::ready:
+        case Models::local:
+            clearHelperWidget(data);
+            paintPreview(data, painter, opt);
+            break;
+        case Models::errorDownload: {
+            paintButton(getButton(data), painter, data.sentByMe, opt);
+            paintComment(data, painter, opt);
+        }
+            
+            break;
+        case Models::errorUpload:{
+            clearHelperWidget(data);
+            paintPreview(data, painter, opt);
+            paintComment(data, painter, opt);
+        }
+            break;
+    }
+    painter->restore();
+    
+    int messageLeft = INT16_MAX;
+    int messageRight = opt.rect.x() + messageSize.width();
+    QWidget* vp = static_cast<QWidget*>(painter->device());
+    if (data.text.size() > 0) {
+        QLabel* body = getBody(data);
+        body->setParent(vp);
+        body->setMaximumWidth(bodySize.width());
+        body->setMinimumWidth(bodySize.width());
+        body->setMinimumHeight(bodySize.height());
+        body->setMaximumHeight(bodySize.height());
+        body->setAlignment(opt.displayAlignment);
+        messageLeft = opt.rect.x();
+        if (data.sentByMe) {
+            messageLeft = opt.rect.topRight().x() - bodySize.width();
+        }
+        body->move(messageLeft, opt.rect.y());
+        body->show();
+        opt.rect.adjust(0, bodySize.height() + textMargin, 0, 0);
+    }
+    painter->setFont(dateFont);
+    QColor q = painter->pen().color();
+    q.setAlpha(180);
+    painter->setPen(q);
+    painter->drawText(opt.rect, opt.displayAlignment, data.date.toLocalTime().toString(), &rect);
+    int currentY = opt.rect.y();
+    if (data.sentByMe) {
+        QLabel* statusIcon = getStatusIcon(data);
+        
+        statusIcon->setParent(vp);
+        statusIcon->move(opt.rect.topRight().x() - messageSize.width(), currentY);
+        statusIcon->show();
+        
+        opt.rect.adjust(0, statusIconSize + textMargin, 0, 0);
+    }
+    
+    if (data.correction.corrected) {
+        QLabel* pencilIcon = getPencilIcon(data);
+        
+        pencilIcon->setParent(vp);
+        if (data.sentByMe) {
+            pencilIcon->move(opt.rect.topRight().x() - messageSize.width() + statusIconSize + margin, currentY);
+        } else {
+            pencilIcon->move(messageRight - statusIconSize - margin, currentY);
+        }
+        pencilIcon->show();
+    } else {
+        std::map<QString, QLabel*>::const_iterator itr = pencilIcons->find(data.id);
+        if (itr != pencilIcons->end()) {
+            delete itr->second;
+            pencilIcons->erase(itr);
+        }
+    }
+    
+    painter->restore();
+    
+    if (clearingWidgets) {
+        idsToKeep->insert(data.id);
+    }
+}
+
+QSize MessageDelegate::sizeHint(const QStyleOptionViewItem& option, const QModelIndex& index) const
+{
+    QRect messageRect = option.rect.adjusted(0, margin / 2, -(avatarHeight + 3 * margin), -margin / 2);
+    QStyleOptionViewItem opt = option;
+    opt.rect = messageRect;
+    QVariant va = index.data(Models::MessageFeed::Attach);
+    Models::Attachment attach = qvariant_cast<Models::Attachment>(va);
+    QString body = index.data(Models::MessageFeed::Text).toString();
+    QSize messageSize(0, 0);
+    if (body.size() > 0) {
+        messageSize = bodyMetrics.boundingRect(messageRect, Qt::TextWordWrap, body).size();
+        messageSize.rheight() += textMargin;
+    }
+    
+    switch (attach.state) {
+        case Models::none:
+            break;
+        case Models::uploading:
+            messageSize.rheight() += Preview::calculateAttachSize(attach.localPath, messageRect).height() + textMargin;
+        case Models::downloading:
+            messageSize.rheight() += barHeight + textMargin;
+            break;
+        case Models::remote:
+            messageSize.rheight() += buttonHeight + textMargin;
+            break;
+        case Models::ready:
+        case Models::local:
+            messageSize.rheight() += Preview::calculateAttachSize(attach.localPath, messageRect).height() + textMargin;
+            break;
+        case Models::errorDownload:
+            messageSize.rheight() += buttonHeight + textMargin;
+            messageSize.rheight() += dateMetrics.boundingRect(messageRect, Qt::TextWordWrap, attach.error).size().height() + textMargin;
+            break;
+        case Models::errorUpload:
+            messageSize.rheight() += Preview::calculateAttachSize(attach.localPath, messageRect).height() + textMargin;
+            messageSize.rheight() += dateMetrics.boundingRect(messageRect, Qt::TextWordWrap, attach.error).size().height() + textMargin;
+            break;
+    }
+    
+    messageSize.rheight() += nickMetrics.lineSpacing();
+    messageSize.rheight() += textMargin;
+    messageSize.rheight() += dateMetrics.height() > statusIconSize ? dateMetrics.height() : statusIconSize;
+    
+    if (messageSize.height() < avatarHeight) {
+        messageSize.setHeight(avatarHeight);
+    }
+    
+    messageSize.rheight() += margin;
+    
+    return messageSize;
+}
+
+void MessageDelegate::initializeFonts(const QFont& font)
+{
+    bodyFont = font;
+    nickFont = font;
+    dateFont = font;
+    
+    nickFont.setBold(true);
+    
+    float ndps = nickFont.pointSizeF();
+    if (ndps != -1) {
+        nickFont.setPointSizeF(ndps * 1.2);
+    } else {
+        nickFont.setPointSize(nickFont.pointSize() + 2);
+    }
+    
+    dateFont.setItalic(true);
+    float dps = dateFont.pointSizeF();
+    if (dps != -1) {
+        dateFont.setPointSizeF(dps * 0.8);
+    } else {
+        dateFont.setPointSize(dateFont.pointSize() - 2);
+    }
+    
+    bodyMetrics = QFontMetrics(bodyFont);
+    nickMetrics = QFontMetrics(nickFont);
+    dateMetrics = QFontMetrics(dateFont);
+    
+    Preview::initializeFont(bodyFont);
+}
+
+bool MessageDelegate::editorEvent(QEvent* event, QAbstractItemModel* model, const QStyleOptionViewItem& option, const QModelIndex& index)
+{
+    //qDebug() << event->type();
+    
+    
+    return QStyledItemDelegate::editorEvent(event, model, option, index);
+}
+
+void MessageDelegate::paintButton(QPushButton* btn, QPainter* painter, bool sentByMe, QStyleOptionViewItem& option) const
+{
+    QPoint start;
+    if (sentByMe) {
+        start = {option.rect.width() - btn->width(), option.rect.top()};
+    } else {
+        start = option.rect.topLeft();
+    }
+    
+    QWidget* vp = static_cast<QWidget*>(painter->device());
+    btn->setParent(vp);
+    btn->move(start);
+    btn->show();
+    
+    option.rect.adjust(0, buttonHeight + textMargin, 0, 0);
+}
+
+void MessageDelegate::paintComment(const Models::FeedItem& data, QPainter* painter, QStyleOptionViewItem& option) const
+{
+    painter->setFont(dateFont);
+    QColor q = painter->pen().color();
+    q.setAlpha(180);
+    painter->setPen(q);
+    QRect rect;
+    painter->drawText(option.rect, option.displayAlignment, data.attach.error, &rect);
+    option.rect.adjust(0, rect.height() + textMargin, 0, 0);
+}
+
+void MessageDelegate::paintBar(QProgressBar* bar, QPainter* painter, bool sentByMe, QStyleOptionViewItem& option) const
+{
+    QPoint start = option.rect.topLeft();
+    bar->resize(option.rect.width(), barHeight);   
+    
+    painter->translate(start);
+    bar->render(painter, QPoint(), QRegion(), QWidget::DrawChildren);
+    
+    option.rect.adjust(0, barHeight + textMargin, 0, 0);
+}
+
+void MessageDelegate::paintPreview(const Models::FeedItem& data, QPainter* painter, QStyleOptionViewItem& option) const
+{
+    Preview* preview = 0;
+    std::map<QString, Preview*>::iterator itr = previews->find(data.id);
+
+    QSize size = option.rect.size();
+    if (itr != previews->end()) {
+        preview = itr->second;
+        preview->actualize(data.attach.localPath, size, option.rect.topLeft());
+    } else {
+        QWidget* vp = static_cast<QWidget*>(painter->device());
+        preview = new Preview(data.attach.localPath, size, option.rect.topLeft(), data.sentByMe, vp);
+        previews->insert(std::make_pair(data.id, preview));
+    }
+    
+    if (!preview->isFileReachable()) {      //this is the situation when the file preview couldn't be painted because the file was moved 
+        emit invalidPath(data.id);          //or deleted. This signal notifies the model, and the model notifies the core, preview can 
+    }                                       //handle being invalid for as long as I need and can be even become valid again with a new path
+    
+    option.rect.adjust(0, preview->size().height() + textMargin, 0, 0);
+}
+
+QPushButton * MessageDelegate::getButton(const Models::FeedItem& data) const
+{
+    std::map<QString, FeedButton*>::const_iterator itr = buttons->find(data.id);
+    FeedButton* result = 0;
+    if (itr != buttons->end()) {
+        result = itr->second;
+    } else {
+        std::map<QString, QProgressBar*>::const_iterator barItr = bars->find(data.id);
+        if (barItr != bars->end()) {
+            delete barItr->second;
+            bars->erase(barItr);
+        }
+    }
+    
+    if (result == 0) {
+        result = new FeedButton();
+        result->messageId = data.id;
+        result->setText(QCoreApplication::translate("MessageLine", "Download"));
+        buttons->insert(std::make_pair(data.id, result));
+        connect(result, &QPushButton::clicked, this, &MessageDelegate::onButtonPushed);
+    }
+    
+    return result;
+}
+
+QProgressBar * MessageDelegate::getBar(const Models::FeedItem& data) const
+{
+    std::map<QString, QProgressBar*>::const_iterator barItr = bars->find(data.id);
+    QProgressBar* result = 0;
+    if (barItr != bars->end()) {
+        result = barItr->second;
+    } else {
+        std::map<QString, FeedButton*>::const_iterator itr = buttons->find(data.id);
+        if (itr != buttons->end()) {
+            delete itr->second;
+            buttons->erase(itr);
+        }
+    }
+    
+    if (result == 0) {
+        result = new QProgressBar();
+        result->setRange(0, 100);
+        bars->insert(std::make_pair(data.id, result));
+    }
+    
+    result->setValue(data.attach.progress * 100);
+    
+    return result;
+}
+
+QLabel * MessageDelegate::getStatusIcon(const Models::FeedItem& data) const
+{
+    std::map<QString, QLabel*>::const_iterator itr = statusIcons->find(data.id);
+    QLabel* result = 0;
+    
+    if (itr != statusIcons->end()) {
+        result = itr->second;
+    } else {
+        result = new QLabel();
+        statusIcons->insert(std::make_pair(data.id, result));
+    }
+    
+    QIcon q(Shared::icon(Shared::messageStateThemeIcons[static_cast<uint8_t>(data.state)]));
+    QString tt = Shared::Global::getName(data.state);
+    if (data.state == Shared::Message::State::error) {
+        if (data.error > 0) {
+            tt += ": " + data.error;
+        }
+    }
+    if (result->toolTip() != tt) {                      //If i just assign pixmap every time unconditionally
+        result->setPixmap(q.pixmap(statusIconSize));    //it invokes an infinite cycle of repaint
+        result->setToolTip(tt);                         //may be it's better to subclass and store last condition in int?
+    }
+    
+    return result;
+}
+
+QLabel * MessageDelegate::getPencilIcon(const Models::FeedItem& data) const
+{
+    std::map<QString, QLabel*>::const_iterator itr = pencilIcons->find(data.id);
+    QLabel* result = 0;
+    
+    if (itr != pencilIcons->end()) {
+        result = itr->second;
+    } else {
+        result = new QLabel();
+        QIcon icon = Shared::icon("edit-rename");
+        result->setPixmap(icon.pixmap(statusIconSize));
+        pencilIcons->insert(std::make_pair(data.id, result));
+    }
+    
+    result->setToolTip("Last time edited: " + data.correction.lastCorrection.toLocalTime().toString() 
+    + "\nOriginal message: " + data.correction.original);
+    
+    return result;
+}
+
+QLabel * MessageDelegate::getBody(const Models::FeedItem& data) const
+{
+    std::map<QString, QLabel*>::const_iterator itr = bodies->find(data.id);
+    QLabel* result = 0;
+    
+    if (itr != bodies->end()) {
+        result = itr->second;
+    } else {
+        result = new QLabel();
+        result->setFont(bodyFont);
+        result->setWordWrap(true);
+        result->setOpenExternalLinks(true);
+        result->setTextInteractionFlags(result->textInteractionFlags() | Qt::TextSelectableByMouse | Qt::LinksAccessibleByMouse);
+        bodies->insert(std::make_pair(data.id, result));
+    }
+    
+    result->setText(Shared::processMessageBody(data.text));
+    
+    return result;
+}
+
+void MessageDelegate::beginClearWidgets()
+{
+    idsToKeep->clear();
+    clearingWidgets = true;
+}
+
+template <typename T>
+void removeElements(std::map<QString, T*>* elements, std::set<QString>* idsToKeep) {
+    std::set<QString> toRemove;
+    for (const std::pair<const QString, T*>& pair: *elements) {
+        if (idsToKeep->find(pair.first) == idsToKeep->end()) {
+            delete pair.second;
+            toRemove.insert(pair.first);
+        }
+    }
+    for (const QString& key : toRemove) {
+        elements->erase(key);
+    }
+}
+
+void MessageDelegate::endClearWidgets()
+{
+    if (clearingWidgets) {
+        removeElements(buttons, idsToKeep);
+        removeElements(bars, idsToKeep);
+        removeElements(statusIcons, idsToKeep);
+        removeElements(pencilIcons, idsToKeep);
+        removeElements(bodies, idsToKeep);
+        removeElements(previews, idsToKeep);
+        
+        idsToKeep->clear();
+        clearingWidgets = false;
+    }
+}
+
+void MessageDelegate::onButtonPushed() const
+{
+    FeedButton* btn = static_cast<FeedButton*>(sender());
+    emit buttonPushed(btn->messageId);
+}
+
+void MessageDelegate::clearHelperWidget(const Models::FeedItem& data) const
+{
+    std::map<QString, FeedButton*>::const_iterator itr = buttons->find(data.id);
+    if (itr != buttons->end()) {
+        delete itr->second;
+        buttons->erase(itr);
+    } else {
+        std::map<QString, QProgressBar*>::const_iterator barItr = bars->find(data.id);
+        if (barItr != bars->end()) {
+            delete barItr->second;
+            bars->erase(barItr);
+        }
+    }
+}
+
+// void MessageDelegate::setModelData(QWidget* editor, QAbstractItemModel* model, const QModelIndex& index) const
+// {
+//     
+// }

ui/widgets/messageline/messagedelegate.h

@@ -0,0 +1,105 @@
+/*
+ * Squawk messenger. 
+ * Copyright (C) 2019  Yury Gubich <blue@macaw.me>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef MESSAGEDELEGATE_H
+#define MESSAGEDELEGATE_H
+
+#include <map>
+#include <set>
+
+#include <QStyledItemDelegate>
+#include <QStyleOptionButton>
+#include <QFont>
+#include <QFontMetrics>
+#include <QPushButton>
+#include <QProgressBar>
+#include <QLabel>
+
+#include "shared/icons.h"
+#include "shared/global.h"
+#include "shared/utils.h"
+
+#include "preview.h"
+
+namespace Models {
+    struct FeedItem;
+};
+
+class MessageDelegate : public QStyledItemDelegate
+{
+    Q_OBJECT
+public:
+    MessageDelegate(QObject *parent = nullptr);
+    ~MessageDelegate();
+    
+    void paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const override;
+    QSize sizeHint(const QStyleOptionViewItem& option, const QModelIndex& index) const override;
+    //void setModelData(QWidget * editor, QAbstractItemModel * model, const QModelIndex & index) const override;
+    
+    void initializeFonts(const QFont& font);
+    bool editorEvent(QEvent * event, QAbstractItemModel * model, const QStyleOptionViewItem & option, const QModelIndex & index) override;
+    void endClearWidgets();
+    void beginClearWidgets();
+    
+signals:
+    void buttonPushed(const QString& messageId) const;
+    void invalidPath(const QString& messageId) const;
+    
+protected:
+    void paintButton(QPushButton* btn, QPainter* painter, bool sentByMe, QStyleOptionViewItem& option) const;
+    void paintBar(QProgressBar* bar, QPainter* painter, bool sentByMe, QStyleOptionViewItem& option) const;
+    void paintPreview(const Models::FeedItem& data, QPainter* painter, QStyleOptionViewItem& option) const;
+    void paintComment(const Models::FeedItem& data, QPainter* painter, QStyleOptionViewItem& option) const;
+    QPushButton* getButton(const Models::FeedItem& data) const;
+    QProgressBar* getBar(const Models::FeedItem& data) const;
+    QLabel* getStatusIcon(const Models::FeedItem& data) const;
+    QLabel* getPencilIcon(const Models::FeedItem& data) const;
+    QLabel* getBody(const Models::FeedItem& data) const;
+    void clearHelperWidget(const Models::FeedItem& data) const;
+    
+protected slots:
+    void onButtonPushed() const;
+    
+private:
+    class FeedButton : public QPushButton {
+    public:
+        QString messageId;
+    };
+    
+    QFont bodyFont;
+    QFont nickFont;
+    QFont dateFont;
+    QFontMetrics bodyMetrics;
+    QFontMetrics nickMetrics;
+    QFontMetrics dateMetrics;
+    
+    int buttonHeight;
+    int barHeight;
+    
+    std::map<QString, FeedButton*>* buttons;
+    std::map<QString, QProgressBar*>* bars;
+    std::map<QString, QLabel*>* statusIcons;
+    std::map<QString, QLabel*>* pencilIcons;
+    std::map<QString, QLabel*>* bodies;
+    std::map<QString, Preview*>* previews;
+    std::set<QString>* idsToKeep;
+    bool clearingWidgets;
+    
+};
+
+#endif // MESSAGEDELEGATE_H

ui/widgets/messageline/messagefeed.cpp

@@ -0,0 +1,674 @@
+/*
+ * Squawk messenger. 
+ * Copyright (C) 2019  Yury Gubich <blue@macaw.me>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "messagefeed.h"
+
+#include <ui/models/element.h>
+#include <ui/models/room.h>
+
+#include <QDebug>
+
+const QHash<int, QByteArray> Models::MessageFeed::roles = {
+    {Text, "text"},
+    {Sender, "sender"},
+    {Date, "date"},
+    {DeliveryState, "deliveryState"},
+    {Correction, "correction"},
+    {SentByMe,"sentByMe"},
+    {Avatar, "avatar"},
+    {Attach, "attach"},
+    {Id, "id"},
+    {Error, "error"},
+    {Bulk, "bulk"}
+};
+
+Models::MessageFeed::MessageFeed(const Element* ri, QObject* parent):
+    QAbstractListModel(parent),
+    storage(),
+    indexById(storage.get<id>()),
+    indexByTime(storage.get<time>()),
+    rosterItem(ri),
+    syncState(incomplete),
+    uploads(),
+    downloads(),
+    failedDownloads(),
+    failedUploads(),
+    unreadMessages(new std::set<QString>()),
+    observersAmount(0)
+{
+}
+
+Models::MessageFeed::~MessageFeed()
+{
+    delete unreadMessages;
+    
+    for (Shared::Message* message : storage) {
+        delete message;
+    }
+}
+
+void Models::MessageFeed::addMessage(const Shared::Message& msg)
+{
+    QString id = msg.getId();
+    StorageById::const_iterator itr = indexById.find(id);
+    if (itr != indexById.end()) {
+        qDebug() << "received more then one message with the same id, skipping yet the new one";
+        return;
+    }
+    
+    Shared::Message* copy = new Shared::Message(msg);
+    StorageByTime::const_iterator tItr = indexByTime.upper_bound(msg.getTime());
+    int position;
+    if (tItr == indexByTime.end()) {
+        position = storage.size();
+    } else {
+        position = indexByTime.rank(tItr);
+    }
+    beginInsertRows(QModelIndex(), position, position);
+    storage.insert(copy);
+    endInsertRows();
+    
+    emit newMessage(msg);
+    
+    if (observersAmount == 0 && !msg.getForwarded()) {      //not to notify when the message is delivered by the carbon copy
+        unreadMessages->insert(msg.getId());                //cuz it could be my own one or the one I read on another device
+        emit unreadMessagesCountChanged();
+        emit unnoticedMessage(msg);
+    }
+}
+
+void Models::MessageFeed::changeMessage(const QString& id, const QMap<QString, QVariant>& data)
+{
+    StorageById::iterator itr = indexById.find(id);
+    if (itr == indexById.end()) {
+        qDebug() << "received a command to change a message, but the message couldn't be found, skipping";
+        return;
+    }
+    
+    Shared::Message* msg = *itr;
+    std::set<MessageRoles> changeRoles = detectChanges(*msg, data);
+    QModelIndex index = modelIndexByTime(id, msg->getTime());
+    Shared::Message::Change functor(data);
+    bool success = indexById.modify(itr, functor);
+    if (!success) {
+        qDebug() << "received a command to change a message, but something went wrong modifying message in the feed, throwing error";
+        throw 872;
+    }
+    
+    if (functor.hasIdBeenModified()) {
+        changeRoles.insert(MessageRoles::Id);
+        std::set<QString>::const_iterator umi = unreadMessages->find(id);
+        if (umi != unreadMessages->end()) {
+            unreadMessages->erase(umi);
+            unreadMessages->insert(msg->getId());
+        }
+    }
+    
+    if (changeRoles.size() > 0) {
+        //change message is a final event in download/upload event train
+        //only after changeMessage we can consider the download is done
+        Progress::const_iterator dItr = downloads.find(id);
+        bool attachOrError = changeRoles.count(MessageRoles::Attach) > 0 || changeRoles.count(MessageRoles::Error);
+        if (dItr != downloads.end()) {
+            if (attachOrError) {
+                downloads.erase(dItr);
+            } else if (changeRoles.count(MessageRoles::Id) > 0) {
+                qreal progress = dItr->second;
+                downloads.erase(dItr);
+                downloads.insert(std::make_pair(msg->getId(), progress));
+            }
+        } else {
+            dItr = uploads.find(id);
+            if (dItr != uploads.end()) {
+                if (attachOrError) {
+                    uploads.erase(dItr);
+                } else if (changeRoles.count(MessageRoles::Id) > 0) {
+                    qreal progress = dItr->second;
+                    uploads.erase(dItr);
+                    uploads.insert(std::make_pair(msg->getId(), progress));
+                }
+            }
+        }
+        
+        Err::const_iterator eitr = failedDownloads.find(id);
+        if (eitr != failedDownloads.end()) {
+            failedDownloads.erase(eitr);
+            changeRoles.insert(MessageRoles::Attach);
+        } else {
+            eitr = failedUploads.find(id);
+            if (eitr != failedUploads.end()) {
+                failedUploads.erase(eitr);
+                changeRoles.insert(MessageRoles::Attach);
+            }
+        }
+        
+        QVector<int> cr;
+        for (MessageRoles role : changeRoles) {
+            cr.push_back(role);
+        }
+        
+        emit dataChanged(index, index, cr);
+    }
+}
+
+std::set<Models::MessageFeed::MessageRoles> Models::MessageFeed::detectChanges(const Shared::Message& msg, const QMap<QString, QVariant>& data) const
+{
+    std::set<MessageRoles> roles;
+    Shared::Message::State state = msg.getState();
+    QMap<QString, QVariant>::const_iterator itr = data.find("state");
+    if (itr != data.end() && static_cast<Shared::Message::State>(itr.value().toUInt()) != state) {
+        roles.insert(MessageRoles::DeliveryState);
+    }
+    
+    itr = data.find("outOfBandUrl");
+    bool att = false;
+    if (itr != data.end() && itr.value().toString() != msg.getOutOfBandUrl()) {
+        roles.insert(MessageRoles::Attach);
+        att = true;
+    }
+    
+    if (!att) {
+        itr = data.find("attachPath");
+        if (itr != data.end() && itr.value().toString() != msg.getAttachPath()) {
+            roles.insert(MessageRoles::Attach);
+        }
+    }
+    
+    if (state == Shared::Message::State::error) {
+        itr = data.find("errorText");
+        if (itr != data.end() && itr.value().toString() != msg.getErrorText()) {
+            roles.insert(MessageRoles::Error);
+        }
+    }
+    
+    itr = data.find("body");
+    if (itr != data.end() && itr.value().toString() != msg.getBody()) {
+        QMap<QString, QVariant>::const_iterator dItr = data.find("stamp");
+        QDateTime correctionDate;
+        if (dItr != data.end()) {
+            correctionDate = dItr.value().toDateTime();
+        } else {
+            correctionDate = QDateTime::currentDateTimeUtc();      //in case there is no information about time of this correction it's applied
+        }
+        if (!msg.getEdited() || msg.getLastModified() < correctionDate) {
+            roles.insert(MessageRoles::Text);
+            roles.insert(MessageRoles::Correction);
+        }
+    } else {
+        QMap<QString, QVariant>::const_iterator dItr = data.find("stamp");
+        if (dItr != data.end()) {
+            QDateTime ntime = dItr.value().toDateTime();
+            if (msg.getTime() != ntime) {
+                roles.insert(MessageRoles::Date);
+            }
+        }
+    }
+    
+    return roles;
+}
+
+void Models::MessageFeed::removeMessage(const QString& id)
+{
+}
+
+QVariant Models::MessageFeed::data(const QModelIndex& index, int role) const
+{
+    int i = index.row();
+    QVariant answer;
+    
+    StorageByTime::const_iterator itr = indexByTime.nth(i);
+    if (itr != indexByTime.end()) {
+        const Shared::Message* msg = *itr;
+        
+        switch (role) {
+            case Qt::DisplayRole:
+            case Text: {
+                QString body = msg->getBody();
+                if (body != msg->getOutOfBandUrl()) {
+                    answer = body;
+                }
+            }
+                break;
+            case Sender: 
+                if (sentByMe(*msg)) {
+                    answer = rosterItem->getAccountName();
+                } else {
+                    if (rosterItem->isRoom()) {
+                        answer = msg->getFromResource();
+                    } else {
+                        answer = rosterItem->getDisplayedName();
+                    }
+                }
+                break;
+            case Date: 
+                answer = msg->getTime();
+                break;
+            case DeliveryState: 
+                answer = static_cast<unsigned int>(msg->getState());
+                break;
+            case Correction: 
+                answer.setValue(fillCorrection(*msg));;
+                break;
+            case SentByMe: 
+                answer = sentByMe(*msg);
+                break;
+            case Avatar: {
+                QString path;
+                if (sentByMe(*msg)) {
+                    path = rosterItem->getAccountAvatarPath();
+                } else if (!rosterItem->isRoom()) {
+                    if (rosterItem->getAvatarState() != Shared::Avatar::empty) {
+                        path = rosterItem->getAvatarPath();
+                    }
+                } else {
+                    const Room* room = static_cast<const Room*>(rosterItem);
+                    path = room->getParticipantIconPath(msg->getFromResource());
+                }
+                
+                if (path.size() == 0) {
+                    answer = Shared::iconPath("user", true);
+                } else {
+                    answer = path;
+                }
+            }
+                break;
+            case Attach: 
+                answer.setValue(fillAttach(*msg));
+                break;
+            case Id: 
+                answer.setValue(msg->getId());
+                break;
+                break;
+            case Error: 
+                answer.setValue(msg->getErrorText());
+                break;
+            case Bulk: {
+                FeedItem item;
+                item.id = msg->getId();
+                
+                std::set<QString>::const_iterator umi = unreadMessages->find(item.id);
+                if (umi != unreadMessages->end()) {
+                    unreadMessages->erase(umi);
+                    emit unreadMessagesCountChanged();
+                }
+                
+                item.sentByMe = sentByMe(*msg);
+                item.date = msg->getTime();
+                item.state = msg->getState();
+                item.error = msg->getErrorText();
+                item.correction = fillCorrection(*msg);
+                
+                QString body = msg->getBody();
+                if (body != msg->getOutOfBandUrl()) {
+                    item.text = body;
+                }
+                
+                item.avatar.clear();
+                if (item.sentByMe) {
+                    item.sender = rosterItem->getAccountName();
+                    item.avatar = rosterItem->getAccountAvatarPath();
+                } else {
+                    if (rosterItem->isRoom()) {
+                        item.sender = msg->getFromResource();
+                        const Room* room = static_cast<const Room*>(rosterItem);
+                        item.avatar = room->getParticipantIconPath(msg->getFromResource());
+                    } else {
+                        item.sender = rosterItem->getDisplayedName();
+                        if (rosterItem->getAvatarState() != Shared::Avatar::empty) {
+                            item.avatar = rosterItem->getAvatarPath();
+                        }
+                    }
+                }
+                
+                if (item.avatar.size() == 0) {
+                    item.avatar = Shared::iconPath("user", true);
+                }
+                item.attach = fillAttach(*msg);
+                answer.setValue(item);
+            }
+                break;
+            default:
+                break;
+        }
+    }
+    
+    return answer;
+}
+
+int Models::MessageFeed::rowCount(const QModelIndex& parent) const
+{
+    return storage.size();
+}
+
+unsigned int Models::MessageFeed::unreadMessagesCount() const
+{
+    return unreadMessages->size();
+}
+
+bool Models::MessageFeed::canFetchMore(const QModelIndex& parent) const
+{
+    return syncState == incomplete;
+}
+
+void Models::MessageFeed::fetchMore(const QModelIndex& parent)
+{
+    if (syncState == incomplete) {
+        syncState = syncing;
+        emit syncStateChange(syncState);
+        
+        if (storage.size() == 0) {
+            emit requestArchive("");
+        } else {
+            emit requestArchive((*indexByTime.rbegin())->getId());
+        }
+    }
+}
+
+void Models::MessageFeed::responseArchive(const std::list<Shared::Message> list, bool last)
+{
+    Storage::size_type size = storage.size();
+    
+    beginInsertRows(QModelIndex(), size, size + list.size() - 1);
+    for (const Shared::Message& msg : list) {
+        Shared::Message* copy = new Shared::Message(msg);
+        storage.insert(copy);
+    }
+    endInsertRows();
+    
+    if (syncState == syncing) {
+        if (last) {
+            syncState = complete;
+        } else {
+            syncState = incomplete;
+        }
+        emit syncStateChange(syncState);
+    }
+}
+
+QModelIndex Models::MessageFeed::index(int row, int column, const QModelIndex& parent) const
+{
+    if (!hasIndex(row, column, parent)) {
+        return QModelIndex();
+    }
+    
+    StorageByTime::iterator itr = indexByTime.nth(row);
+    if (itr != indexByTime.end()) {
+        Shared::Message* msg = *itr;
+        
+        return createIndex(row, column, msg);
+    } else {
+        return QModelIndex();
+    }
+}
+
+QHash<int, QByteArray> Models::MessageFeed::roleNames() const
+{
+    return roles;
+}
+
+bool Models::MessageFeed::sentByMe(const Shared::Message& msg) const
+{
+    if (rosterItem->isRoom()) {
+        const Room* room = static_cast<const Room*>(rosterItem);
+        return room->getNick().toLower() == msg.getFromResource().toLower();
+    } else {
+        return msg.getOutgoing();
+    }
+}
+
+Models::Attachment Models::MessageFeed::fillAttach(const Shared::Message& msg) const
+{
+    ::Models::Attachment att;
+    QString id = msg.getId();
+    
+    att.localPath = msg.getAttachPath();
+    att.remotePath = msg.getOutOfBandUrl();
+    
+    if (att.remotePath.size() == 0) {
+        if (att.localPath.size() == 0) {
+            att.state = none;
+        } else {
+            Err::const_iterator eitr = failedUploads.find(id);
+            if (eitr != failedUploads.end()) {
+                att.state = errorUpload;
+                att.error = eitr->second;
+            } else {
+                Progress::const_iterator itr = uploads.find(id);
+                if (itr == uploads.end()) {
+                    att.state = local;
+                } else {
+                    att.state = uploading;
+                    att.progress = itr->second;
+                }
+            }
+        }
+    } else {
+        if (att.localPath.size() == 0) {
+            Err::const_iterator eitr = failedDownloads.find(id);
+            if (eitr != failedDownloads.end()) {
+                att.state = errorDownload;
+                att.error = eitr->second;
+            } else {
+                Progress::const_iterator itr = downloads.find(id);
+                if (itr == downloads.end()) {
+                    att.state = remote;
+                } else {
+                    att.state = downloading;
+                    att.progress = itr->second;
+                }
+            }
+        } else {
+            att.state = ready;
+        }
+    }
+    
+    return att;
+}
+
+Models::Edition Models::MessageFeed::fillCorrection(const Shared::Message& msg) const
+{
+    ::Models::Edition ed({msg.getEdited(), msg.getOriginalBody(), msg.getLastModified()});
+    
+    return ed;
+}
+
+
+void Models::MessageFeed::downloadAttachment(const QString& messageId)
+{
+    bool notify = false;
+    Err::const_iterator eitr = failedDownloads.find(messageId);
+    if (eitr != failedDownloads.end()) {
+        failedDownloads.erase(eitr);
+        notify = true;
+    }
+    
+    QModelIndex ind = modelIndexById(messageId);
+    if (ind.isValid()) {
+        std::pair<Progress::iterator, bool> progressPair = downloads.insert(std::make_pair(messageId, 0));
+        if (progressPair.second) {     //Only to take action if we weren't already downloading it
+            Shared::Message* msg = static_cast<Shared::Message*>(ind.internalPointer());
+            notify = true;
+            emit fileDownloadRequest(msg->getOutOfBandUrl());
+        } else {
+            qDebug() << "Attachment download for message with id" << messageId << "is already in progress, skipping";
+        }
+    } else {
+        qDebug() << "An attempt to download an attachment for the message that doesn't exist. ID:" << messageId;
+    }
+    
+    if (notify) {
+        emit dataChanged(ind, ind, {MessageRoles::Attach});
+    }
+}
+
+bool Models::MessageFeed::registerUpload(const QString& messageId)
+{
+    bool success = uploads.insert(std::make_pair(messageId, 0)).second; 
+    
+    QVector<int> roles({});
+    Err::const_iterator eitr = failedUploads.find(messageId);
+    if (eitr != failedUploads.end()) {
+        failedUploads.erase(eitr);
+        roles.push_back(MessageRoles::Attach);
+    } else if (success) {
+        roles.push_back(MessageRoles::Attach);
+    }
+    
+    QModelIndex ind = modelIndexById(messageId);
+    emit dataChanged(ind, ind, roles);
+    
+    return success;
+}
+
+void Models::MessageFeed::fileProgress(const QString& messageId, qreal value, bool up)
+{
+    Progress* pr = 0;
+    Err* err = 0;
+    if (up) {
+        pr = &uploads;
+        err = &failedUploads;
+    } else {
+        pr = &downloads;
+        err = &failedDownloads;
+    }
+    
+    QVector<int> roles({});
+    Err::const_iterator eitr = err->find(messageId);
+    if (eitr != err->end() && value != 1) {         //like I want to clear this state when the download is started anew
+        err->erase(eitr);
+        roles.push_back(MessageRoles::Attach);
+    }
+    
+    Progress::iterator itr = pr->find(messageId);
+    if (itr != pr->end()) {
+        itr->second = value;
+        QModelIndex ind = modelIndexById(messageId);
+        emit dataChanged(ind, ind, roles);
+    }
+}
+
+void Models::MessageFeed::fileComplete(const QString& messageId, bool up)
+{
+    fileProgress(messageId, 1, up);
+}
+
+void Models::MessageFeed::fileError(const QString& messageId, const QString& error, bool up)
+{
+    Err* failed;
+    Progress* loads;
+    if (up) {
+        failed = &failedUploads;
+        loads = &uploads;
+    } else {
+        failed = &failedDownloads;
+        loads = &downloads;
+    }
+    
+    Progress::iterator pitr = loads->find(messageId);
+    if (pitr != loads->end()) {
+        loads->erase(pitr);
+    }
+    
+    std::pair<Err::iterator, bool> pair = failed->insert(std::make_pair(messageId, error));
+    if (!pair.second) {
+        pair.first->second = error;
+    }
+    QModelIndex ind = modelIndexById(messageId);
+    if (ind.isValid()) {
+        emit dataChanged(ind, ind, {MessageRoles::Attach});
+    }
+}
+
+void Models::MessageFeed::incrementObservers()
+{
+    ++observersAmount;
+}
+
+void Models::MessageFeed::decrementObservers()
+{
+    --observersAmount;
+}
+
+
+QModelIndex Models::MessageFeed::modelIndexById(const QString& id) const
+{
+    StorageById::const_iterator itr = indexById.find(id);
+    if (itr != indexById.end()) {
+        Shared::Message* msg = *itr;
+        return modelIndexByTime(id, msg->getTime());
+    }
+    
+    return QModelIndex();
+}
+
+QModelIndex Models::MessageFeed::modelIndexByTime(const QString& id, const QDateTime& time) const
+{
+    if (indexByTime.size() > 0) {
+        StorageByTime::const_iterator tItr = indexByTime.lower_bound(time);
+        StorageByTime::const_iterator tEnd = indexByTime.upper_bound(time);
+        bool found = false;
+        while (tItr != tEnd) {
+            if (id == (*tItr)->getId()) {
+                found = true;
+                break;
+            }
+            ++tItr;
+        }
+        
+        if (found) {
+            int position = indexByTime.rank(tItr);
+            return createIndex(position, 0, *tItr);
+        }
+    }
+    
+    return QModelIndex();
+}
+
+void Models::MessageFeed::reportLocalPathInvalid(const QString& messageId)
+{
+    StorageById::iterator itr = indexById.find(messageId);
+    if (itr == indexById.end()) {
+        qDebug() << "received a command to change a message, but the message couldn't be found, skipping";
+        return;
+    }
+    
+    Shared::Message* msg = *itr;
+    
+    emit localPathInvalid(msg->getAttachPath());
+    
+    //gonna change the message in current model right away, to prevent spam on each attempt to draw element
+    QModelIndex index = modelIndexByTime(messageId, msg->getTime());
+    msg->setAttachPath("");
+    
+    emit dataChanged(index, index, {MessageRoles::Attach});
+}
+
+Models::MessageFeed::SyncState Models::MessageFeed::getSyncState() const
+{
+    return syncState;
+}
+
+void Models::MessageFeed::requestLatestMessages()
+{
+    if (syncState != syncing) {
+        syncState = syncing;
+        emit syncStateChange(syncState);
+        
+        emit requestArchive("");
+    }
+}

ui/widgets/messageline/messagefeed.h

@@ -0,0 +1,209 @@
+/*
+ * Squawk messenger. 
+ * Copyright (C) 2019  Yury Gubich <blue@macaw.me>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef MESSAGEFEED_H
+#define MESSAGEFEED_H
+
+#include <QAbstractListModel>
+#include <QDateTime>
+#include <QString>
+
+#include <set>
+
+#include <boost/multi_index_container.hpp>
+#include <boost/multi_index/ordered_index.hpp>
+#include <boost/multi_index/ranked_index.hpp>
+#include <boost/multi_index/mem_fun.hpp>
+
+#include <shared/message.h>
+#include <shared/icons.h>
+
+
+namespace Models {
+    class Element;
+    struct Attachment;
+    struct Edition;
+    
+class MessageFeed : public QAbstractListModel
+{
+    Q_OBJECT
+public:    
+    enum SyncState {
+        incomplete,
+        syncing,
+        complete
+    };
+    
+    MessageFeed(const Element* rosterItem, QObject *parent = nullptr);
+    ~MessageFeed();
+    
+    void addMessage(const Shared::Message& msg);
+    void changeMessage(const QString& id, const QMap<QString, QVariant>& data);
+    void removeMessage(const QString& id);
+    
+    QVariant data(const QModelIndex & index, int role = Qt::DisplayRole) const override;
+    int rowCount(const QModelIndex& parent = QModelIndex()) const override;
+    
+    bool canFetchMore(const QModelIndex & parent) const override;
+    void fetchMore(const QModelIndex & parent) override;
+    QHash<int, QByteArray> roleNames() const override;
+    QModelIndex index(int row, int column, const QModelIndex & parent) const override;
+    
+    void responseArchive(const std::list<Shared::Message> list, bool last);
+    void downloadAttachment(const QString& messageId);
+    bool registerUpload(const QString& messageId);
+    void reportLocalPathInvalid(const QString& messageId);
+    
+    unsigned int unreadMessagesCount() const;
+    void fileProgress(const QString& messageId, qreal value, bool up);
+    void fileError(const QString& messageId, const QString& error, bool up);
+    void fileComplete(const QString& messageId, bool up);
+    
+    void incrementObservers();
+    void decrementObservers();
+    SyncState getSyncState() const;
+    
+    void requestLatestMessages();       //this method is used by Models::Contact to request latest messages after reconnection
+    
+signals:
+    void requestArchive(const QString& before);
+    void fileDownloadRequest(const QString& url);
+    void unreadMessagesCountChanged() const;
+    void newMessage(const Shared::Message& msg);
+    void unnoticedMessage(const Shared::Message& msg);
+    void localPathInvalid(const QString& path);
+    void syncStateChange(SyncState state);
+    
+public:
+    enum MessageRoles {
+        Text = Qt::UserRole + 1,
+        Sender,
+        Date,
+        DeliveryState,
+        Correction,
+        SentByMe,
+        Avatar,
+        Attach,
+        Id,
+        Error,
+        Bulk
+    };
+    
+protected:
+    bool sentByMe(const Shared::Message& msg) const;
+    Attachment fillAttach(const Shared::Message& msg) const;
+    Edition fillCorrection(const Shared::Message& msg) const;
+    QModelIndex modelIndexById(const QString& id) const;
+    QModelIndex modelIndexByTime(const QString& id, const QDateTime& time) const;
+    std::set<MessageRoles> detectChanges(const Shared::Message& msg, const QMap<QString, QVariant>& data) const;
+    
+private:
+    //tags
+    struct id {};
+    struct time {};
+    
+    typedef boost::multi_index_container<
+        Shared::Message*,
+        boost::multi_index::indexed_by<
+            boost::multi_index::ordered_unique<
+                boost::multi_index::tag<id>,
+                boost::multi_index::const_mem_fun<
+                    Shared::Message,
+                    QString,
+                    &Shared::Message::getId
+                >
+            >,
+            boost::multi_index::ranked_non_unique<
+                boost::multi_index::tag<time>,
+                boost::multi_index::const_mem_fun<
+                    Shared::Message,
+                    QDateTime,
+                    &Shared::Message::getTime
+                >,
+                std::greater<QDateTime>
+            >
+        >
+    > Storage; 
+    
+    typedef Storage::index<id>::type StorageById;
+    typedef Storage::index<time>::type StorageByTime;
+    Storage storage;
+    StorageById& indexById;
+    StorageByTime& indexByTime;
+    
+    const Element* rosterItem;
+    SyncState syncState;
+    
+    typedef std::map<QString, qreal> Progress;
+    typedef std::map<QString, QString> Err;
+    Progress uploads;
+    Progress downloads;
+    Err failedDownloads;
+    Err failedUploads;
+    
+    std::set<QString>* unreadMessages;
+    uint16_t observersAmount;
+    
+    
+    static const QHash<int, QByteArray> roles;
+};
+
+enum AttachmentType {
+    none,
+    remote,
+    local,
+    downloading,
+    uploading,
+    errorDownload,
+    errorUpload,
+    ready
+};
+
+struct Attachment {
+    AttachmentType state;
+    qreal progress;
+    QString localPath;
+    QString remotePath;
+    QString error;
+};
+
+struct Edition {
+    bool corrected;
+    QString original;
+    QDateTime lastCorrection;
+};
+
+struct FeedItem {
+    QString id;
+    QString text;
+    QString sender;
+    QString avatar;
+    QString error;
+    bool sentByMe;
+    Edition correction;
+    QDateTime date;
+    Shared::Message::State state;
+    Attachment attach;
+};
+};
+
+Q_DECLARE_METATYPE(Models::Attachment);
+Q_DECLARE_METATYPE(Models::Edition);
+Q_DECLARE_METATYPE(Models::FeedItem);
+
+#endif // MESSAGEFEED_H

ui/widgets/messageline/preview.cpp

@@ -0,0 +1,323 @@
+/*
+ * Squawk messenger. 
+ * Copyright (C) 2019  Yury Gubich <blue@macaw.me>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "preview.h"
+
+
+constexpr int margin = 6;
+constexpr int maxAttachmentHeight = 500;
+
+QFont Preview::font;
+QFontMetrics Preview::metrics(Preview::font);
+
+Preview::Preview(const QString& pPath, const QSize& pMaxSize, const QPoint& pos, bool pRight, QWidget* pParent):
+    info(Shared::Global::getFileInfo(pPath)),
+    path(pPath),
+    maxSize(pMaxSize),
+    actualSize(constrainAttachSize(info.size, maxSize)),
+    cachedLabelSize(0, 0),
+    position(pos),
+    widget(0),
+    label(0),
+    parent(pParent),
+    movie(0),
+    fileReachable(true),
+    actualPreview(false),
+    right(pRight)
+{
+    
+    initializeElements();
+    if (fileReachable) {
+        positionElements();
+    }
+}
+
+void Preview::initializeFont(const QFont& newFont)
+{
+    font = newFont;
+    font.setBold(true);
+    metrics = QFontMetrics(font);
+}
+
+Preview::~Preview()
+{
+    clean();
+}
+
+void Preview::clean()
+{
+    if (fileReachable) {
+        if (info.preview == Shared::Global::FileInfo::Preview::animation) {
+            delete movie;
+        }
+        delete widget;
+        if (!actualPreview) {
+            delete label;
+        } else {
+            actualPreview = false;
+        }
+    } else {
+        fileReachable = true;
+    }
+}
+
+void Preview::actualize(const QString& newPath, const QSize& newSize, const QPoint& newPoint)
+{
+    bool positionChanged = false;
+    bool sizeChanged = false;
+    bool maxSizeChanged = false;
+    
+    if (maxSize != newSize) {
+        maxSize = newSize;
+        maxSizeChanged = true;
+        QSize ns = constrainAttachSize(info.size, maxSize);
+        if (actualSize != ns) {
+            sizeChanged = true;
+            actualSize = ns;
+        }
+    }
+    if (position != newPoint) {
+        position = newPoint;
+        positionChanged = true;
+    }
+    
+    if (!setPath(newPath) && fileReachable) {
+        if (sizeChanged) {
+            applyNewSize();
+            if (maxSizeChanged && !actualPreview) {
+                applyNewMaxSize();
+            }
+        } else if (maxSizeChanged) {
+            applyNewMaxSize();
+            if (right) {
+                positionChanged = true;
+            }
+        }
+        if (positionChanged || !actualPreview) {
+            positionElements();
+        }
+    }
+}
+
+void Preview::setSize(const QSize& newSize)
+{
+    bool sizeChanged = false;
+    bool maxSizeChanged = false;
+    
+    if (maxSize != newSize) {
+        maxSize = newSize;
+        maxSizeChanged = true;
+        QSize ns = constrainAttachSize(info.size, maxSize);
+        if (actualSize != ns) {
+            sizeChanged = true;
+            actualSize = ns;
+        }
+    }
+    
+    if (fileReachable) {
+        if (sizeChanged) {
+            applyNewSize();
+        }
+        if (maxSizeChanged || !actualPreview) {
+            applyNewMaxSize();
+            if (right) {
+                positionElements();
+            }
+        }
+    }
+}
+
+void Preview::applyNewSize()
+{
+    switch (info.preview) {
+        case Shared::Global::FileInfo::Preview::picture: {
+            QImageReader img(path);
+            if (!img.canRead()) {
+                delete widget;
+                fileReachable = false;
+            } else {
+                img.setScaledSize(actualSize);
+                widget->resize(actualSize);
+                widget->setPixmap(QPixmap::fromImage(img.read()));
+            }
+        }
+            break;
+        case Shared::Global::FileInfo::Preview::animation:{
+            movie->setScaledSize(actualSize);
+            widget->resize(actualSize);
+        }
+            break;
+        default: {
+            QIcon icon = QIcon::fromTheme(info.mime.iconName());
+            widget->setPixmap(icon.pixmap(actualSize));
+            widget->resize(actualSize);
+        }
+    }
+}
+
+void Preview::applyNewMaxSize()
+{
+    switch (info.preview) {
+        case Shared::Global::FileInfo::Preview::picture: 
+        case Shared::Global::FileInfo::Preview::animation: 
+            break;
+        default: {
+            int labelWidth = maxSize.width() - actualSize.width() - margin;
+            QString elidedName = metrics.elidedText(info.name, Qt::ElideMiddle, labelWidth);
+            cachedLabelSize = metrics.boundingRect(elidedName).size();
+            label->setText(elidedName);
+            label->resize(cachedLabelSize);
+        }
+    }
+}
+
+
+QSize Preview::size() const
+{
+    if (actualPreview) {
+        return actualSize;
+    } else {
+        return QSize(actualSize.width() + margin + cachedLabelSize.width(), actualSize.height());
+    }
+}
+
+bool Preview::isFileReachable() const
+{
+    return fileReachable;
+}
+
+void Preview::setPosition(const QPoint& newPoint)
+{
+    if (position != newPoint) {
+        position = newPoint;
+        if (fileReachable) {
+            positionElements();
+        }
+    }
+}
+
+bool Preview::setPath(const QString& newPath)
+{
+    if (path != newPath) {
+        path = newPath;
+        info = Shared::Global::getFileInfo(path);
+        actualSize = constrainAttachSize(info.size, maxSize);
+        clean();
+        initializeElements();
+        if (fileReachable) {
+            positionElements();
+        }
+        return true;
+    } else {
+        return false;
+    }
+}
+
+void Preview::initializeElements()
+{
+    switch (info.preview) {
+        case Shared::Global::FileInfo::Preview::picture: {
+            QImageReader img(path);
+            if (!img.canRead()) {
+                fileReachable = false;
+            } else {
+                actualPreview = true;
+                img.setScaledSize(actualSize);
+                widget = new QLabel(parent);
+                widget->setPixmap(QPixmap::fromImage(img.read()));
+                widget->show();
+            }
+        }
+            break;
+        case Shared::Global::FileInfo::Preview::animation:{
+            movie = new QMovie(path);
+            QObject::connect(movie, &QMovie::error, 
+                std::bind(&Preview::handleQMovieError, this, std::placeholders::_1)
+            );
+            if (!movie->isValid()) {
+                fileReachable = false;
+                delete movie;
+            } else {
+                actualPreview = true;
+                movie->setScaledSize(actualSize);
+                widget = new QLabel(parent);
+                widget->setMovie(movie);
+                movie->start();
+                widget->show();
+            }
+        }
+            break;
+        default: {
+            QIcon icon = QIcon::fromTheme(info.mime.iconName());
+            widget = new QLabel(parent);
+            widget->setPixmap(icon.pixmap(actualSize));
+            widget->show();
+            
+            label = new QLabel(parent);
+            label->setFont(font);
+            int labelWidth = maxSize.width() - actualSize.width() - margin;
+            QString elidedName = metrics.elidedText(info.name, Qt::ElideMiddle, labelWidth);
+            cachedLabelSize = metrics.boundingRect(elidedName).size();
+            label->setText(elidedName);
+            label->show();
+        }
+    }
+}
+
+void Preview::positionElements()
+{
+    int start = position.x();
+    if (right) {
+        start += maxSize.width() - size().width();
+    }
+    widget->move(start, position.y());
+    if (!actualPreview) {
+        int x = start + actualSize.width() + margin;
+        int y = position.y() + (actualSize.height() - cachedLabelSize.height()) / 2;
+        label->move(x, y);
+    }
+}
+
+QSize Preview::calculateAttachSize(const QString& path, const QRect& bounds)
+{
+    Shared::Global::FileInfo info = Shared::Global::getFileInfo(path);
+    
+    return constrainAttachSize(info.size, bounds.size());
+}
+
+QSize Preview::constrainAttachSize(QSize src, QSize bounds)
+{
+    if (bounds.height() > maxAttachmentHeight) {
+        bounds.setHeight(maxAttachmentHeight);
+    }
+    
+    if (src.width() > bounds.width() || src.height() > bounds.height()) {
+        src.scale(bounds, Qt::KeepAspectRatio);
+    }
+    
+    return src;
+}
+
+void Preview::handleQMovieError(QImageReader::ImageReaderError error)
+{
+    if (error == QImageReader::FileNotFoundError) {
+        fileReachable = false;
+        movie->deleteLater();
+        widget->deleteLater();
+    }
+}