duck taped annoying scroll problem, started with local archive

core/archive.cpp

@@ -0,0 +1,71 @@
+/*
+ * <one line to give the program's name and a brief idea of what it does.>
+ * 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 "archive.h"
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <QStandardPaths>
+#include <QDebug>
+
+Core::Archive::Archive(const QString& p_jid, QObject* parent):
+    QObject(parent),
+    jid(p_jid),
+    opened(false),
+    environment(lmdb::env::create()),
+    dbi(0)
+{
+    
+}
+
+Core::Archive::~Archive()
+{
+}
+
+void Core::Archive::open(const QString& account)
+{
+    if (!opened) {
+        QString path(QStandardPaths::writableLocation(QStandardPaths::CacheLocation));
+        path += "/" + account;
+        int state1 = mkdir(path.toStdString().c_str(), S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
+        if (state1 != 0 && errno != EEXIST) {
+            qDebug() << "Failed to create account " << account << " database folder";
+            throw 1;
+        }
+        
+        path += "/" + jid;
+        
+        int state2 = mkdir(path.toStdString().c_str(), S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
+        if (state2 != 0 && errno != EEXIST) {
+            qDebug() << "Failed to create " << jid.toStdString().c_str() << " database folder in account" << account;
+            throw 1;
+        }
+        
+        environment.set_mapsize(1UL * 1024UL * 1024UL * 1024UL);
+        environment.set_max_dbs(10);
+        environment.open(path.toStdString().c_str(), 0, 0664);
+        
+        lmdb::txn wTrans = lmdb::txn::begin(environment);
+        dbi = lmdb::dbi::open(wTrans, "main", MDB_CREATE);
+        wTrans.commit();
+    }
+}
+
+QString Core::Archive::addElement(const Shared::Message& message)
+{
+    
+}

core/archive.h

@@ -0,0 +1,57 @@
+/*
+ * <one line to give the program's name and a brief idea of what it does.>
+ * 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_ARCHIVE_H
+#define CORE_ARCHIVE_H
+
+#include <QObject>
+#include "../global.h"
+#include "lmdb++.h"
+
+namespace Core {
+
+class Archive : public QObject
+{
+    Q_OBJECT
+public:
+    Archive(const QString& jid, QObject* parent);
+    ~Archive();
+    
+    void open(const QString& account);
+    
+    QString addElement(const Shared::Message& message);
+    Shared::Message getElement(const QString& id) const;
+    Shared::Message oldest() const;
+    Shared::Message newest() const;
+    void removeElement(const QString& id);
+    void clear();
+    void modifyElement(const QString& id, const Shared::Message& newValue);
+    unsigned int size() const;
+    
+public:
+    const QString jid;
+    
+private:
+    bool opened;
+    lmdb::env environment;
+    lmdb::dbi dbi;
+};
+
+}
+
+#endif // CORE_ARCHIVE_H

main.cpp

@@ -54,6 +54,8 @@ int main(int argc, char *argv[])
     QObject::connect(squawk, SIGNAL(stateChanged(int)), &w, SLOT(stateChanged(int)));
     QObject::connect(squawk, SIGNAL(accountMessage(const QString&, const Shared::Message&)), &w, SLOT(accountMessage(const QString&, const Shared::Message&)));
     
+    //qDebug() << QStandardPaths::writableLocation(QStandardPaths::CacheLocation);
+    
     coreThread->start();
 
     int result = app.exec();

ui/conversation.cpp

@@ -29,7 +29,8 @@ Conversation::Conversation(Models::Contact* p_contact, QWidget* parent):
     ker(),
     activePalResource(),
     thread(),
-    scroll(nothing)
+    scroll(down),
+    manualSliderChange(false)
 {
     m_ui->setupUi(this);
     m_ui->splitter->setSizes({300, 0});
@@ -54,9 +55,11 @@ Conversation::Conversation(Models::Contact* p_contact, QWidget* parent):
     line->setMyName(p_contact->getAccountName());
     connect(line, SIGNAL(resize(int)), this, SLOT(onMessagesResize(int)));
     
+    QScrollBar* vs = m_ui->scrollArea->verticalScrollBar();
     m_ui->scrollArea->setWidget(line);
-    m_ui->scrollArea->verticalScrollBar()->setBackgroundRole(QPalette::Base);
+    vs->setBackgroundRole(QPalette::Base);
-    m_ui->scrollArea->verticalScrollBar()->setAutoFillBackground(true);;
+    vs->setAutoFillBackground(true);
+    connect(vs, SIGNAL(valueChanged(int)), this, SLOT(onSliderValueChanged(int)));
 }
 
 Conversation::~Conversation()
@@ -118,13 +121,6 @@ void Conversation::addMessage(const Shared::Message& data)
         return;
     }
     
-    if (scroll == nothing) {
-        if (pos == max) {
-            scroll = down;
-        } else if (place != MessageLine::end) {         //todo make some better handling of that situation
-            scroll = keep;
-        }
-    }
     if (!data.getOutgoing()) {
         const QString& res = data.getPenPalResource();
         if (res.size() > 0) {
@@ -194,16 +190,24 @@ void Conversation::onEnterPressed()
 
 void Conversation::onMessagesResize(int amount)
 {
+    manualSliderChange = true;
     switch (scroll) {
         case down:
             m_ui->scrollArea->verticalScrollBar()->setValue(m_ui->scrollArea->verticalScrollBar()->maximum());
             break;
-        case keep:
-            m_ui->scrollArea->verticalScrollBar()->setValue(m_ui->scrollArea->verticalScrollBar()->value() - amount);
-            break;
         default:
             break;
     }
-    scroll = nothing;
+    manualSliderChange = false;
 }
 
+void Conversation::onSliderValueChanged(int value)
+{
+    if (!manualSliderChange) {
+        if (value == m_ui->scrollArea->verticalScrollBar()->maximum()) {
+            scroll = down;
+        } else {
+            scroll = nothing;
+        }
+    }
+}

ui/conversation.h

@@ -69,6 +69,7 @@ protected slots:
     void onContactChanged(Models::Item* item, int row, int col);
     void onEnterPressed();
     void onMessagesResize(int amount);
+    void onSliderValueChanged(int value);
     
 private:
     enum Scroll {
@@ -83,6 +84,7 @@ private:
     QString activePalResource;
     QString thread;
     Scroll scroll;
+    bool manualSliderChange;
 };
 
 #endif // CONVERSATION_H