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squawk/ui/utils/feedview.cpp

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/*
* 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 "ui/models/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);
}
2020-08-20 21:32:30 +00:00
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);
}
2020-08-20 21:32:30 +00:00
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();
}
}