forked from blue/squawk
message preview refactor, several bugs about label size, animations are now playing in previews
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20 changed files with 498 additions and 164 deletions
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/*
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* Squawk messenger.
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* Copyright (C) 2019 Yury Gubich <blue@macaw.me>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "feedview.h"
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#include <QPaintEvent>
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#include <QPainter>
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#include <QScrollBar>
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#include <QDebug>
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#include "messagedelegate.h"
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#include "ui/models/messagefeed.h"
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constexpr int maxMessageHeight = 10000;
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constexpr int approximateSingleMessageHeight = 20;
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constexpr int progressSize = 70;
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const std::set<int> FeedView::geometryChangingRoles = {
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Models::MessageFeed::Attach,
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Models::MessageFeed::Text,
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Models::MessageFeed::Id,
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Models::MessageFeed::Error,
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Models::MessageFeed::Date
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};
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FeedView::FeedView(QWidget* parent):
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QAbstractItemView(parent),
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hints(),
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vo(0),
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specialDelegate(false),
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specialModel(false),
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clearWidgetsMode(false),
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modelState(Models::MessageFeed::complete),
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progress()
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{
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horizontalScrollBar()->setRange(0, 0);
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verticalScrollBar()->setSingleStep(approximateSingleMessageHeight);
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setMouseTracking(true);
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setSelectionBehavior(SelectItems);
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// viewport()->setAttribute(Qt::WA_Hover, true);
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progress.setParent(viewport());
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progress.resize(progressSize, progressSize);
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}
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FeedView::~FeedView()
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{
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}
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QModelIndex FeedView::indexAt(const QPoint& point) const
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{
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int32_t vh = viewport()->height();
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uint32_t y = vh - point.y() + vo;
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for (std::deque<Hint>::size_type i = 0; i < hints.size(); ++i) {
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const Hint& hint = hints[i];
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if (y <= hint.offset + hint.height) {
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if (y > hint.offset) {
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return model()->index(i, 0, rootIndex());
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} else {
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break;
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}
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}
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}
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return QModelIndex();
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}
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void FeedView::scrollTo(const QModelIndex& index, QAbstractItemView::ScrollHint hint)
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{
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}
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QRect FeedView::visualRect(const QModelIndex& index) const
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{
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unsigned int row = index.row();
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if (!index.isValid() || row >= hints.size()) {
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qDebug() << "visualRect for" << row;
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return QRect();
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} else {
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const Hint& hint = hints.at(row);
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const QWidget* vp = viewport();
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return QRect(0, vp->height() - hint.height - hint.offset + vo, vp->width(), hint.height);
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}
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}
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int FeedView::horizontalOffset() const
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{
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return 0;
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}
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bool FeedView::isIndexHidden(const QModelIndex& index) const
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{
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return false;
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}
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QModelIndex FeedView::moveCursor(QAbstractItemView::CursorAction cursorAction, Qt::KeyboardModifiers modifiers)
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{
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return QModelIndex();
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}
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void FeedView::setSelection(const QRect& rect, QItemSelectionModel::SelectionFlags command)
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{
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}
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int FeedView::verticalOffset() const
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{
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return vo;
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}
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QRegion FeedView::visualRegionForSelection(const QItemSelection& selection) const
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{
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return QRegion();
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}
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void FeedView::rowsInserted(const QModelIndex& parent, int start, int end)
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{
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QAbstractItemView::rowsInserted(parent, start, end);
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scheduleDelayedItemsLayout();
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}
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void FeedView::dataChanged(const QModelIndex& topLeft, const QModelIndex& bottomRight, const QVector<int>& roles)
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{
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if (specialDelegate) {
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for (int role : roles) {
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if (geometryChangingRoles.count(role) != 0) {
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scheduleDelayedItemsLayout(); //to recalculate layout only if there are some geometry changing modifications
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break;
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}
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}
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}
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QAbstractItemView::dataChanged(topLeft, bottomRight, roles);
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}
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void FeedView::updateGeometries()
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{
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qDebug() << "updateGeometries";
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QScrollBar* bar = verticalScrollBar();
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const QStyle* st = style();
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const QAbstractItemModel* m = model();
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QSize layoutBounds = maximumViewportSize();
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QStyleOptionViewItem option = viewOptions();
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option.rect.setHeight(maxMessageHeight);
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option.rect.setWidth(layoutBounds.width());
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int frameAroundContents = 0;
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int verticalScrollBarExtent = st->pixelMetric(QStyle::PM_ScrollBarExtent, 0, bar);
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bool layedOut = false;
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if (verticalScrollBarExtent != 0 && verticalScrollBarPolicy() == Qt::ScrollBarAsNeeded && m->rowCount() * approximateSingleMessageHeight < layoutBounds.height()) {
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hints.clear();
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layedOut = tryToCalculateGeometriesWithNoScrollbars(option, m, layoutBounds.height());
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}
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if (layedOut) {
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bar->setRange(0, 0);
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vo = 0;
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} else {
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int verticalMargin = 0;
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if (st->styleHint(QStyle::SH_ScrollView_FrameOnlyAroundContents)) {
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frameAroundContents = st->pixelMetric(QStyle::PM_DefaultFrameWidth) * 2;
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}
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if (verticalScrollBarPolicy() == Qt::ScrollBarAsNeeded) {
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verticalMargin = verticalScrollBarExtent + frameAroundContents;
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}
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layoutBounds.rwidth() -= verticalMargin;
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option.features |= QStyleOptionViewItem::WrapText;
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option.rect.setWidth(layoutBounds.width());
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hints.clear();
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uint32_t previousOffset = 0;
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for (int i = 0, size = m->rowCount(); i < size; ++i) {
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QModelIndex index = m->index(i, 0, rootIndex());
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int height = itemDelegate(index)->sizeHint(option, index).height();
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hints.emplace_back(Hint({
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false,
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previousOffset,
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static_cast<uint32_t>(height)
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}));
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previousOffset += height;
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}
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int totalHeight = previousOffset - layoutBounds.height();
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if (modelState != Models::MessageFeed::complete) {
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totalHeight += progressSize;
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}
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vo = qMax(qMin(vo, totalHeight), 0);
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bar->setRange(0, totalHeight);
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bar->setPageStep(layoutBounds.height());
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bar->setValue(totalHeight - vo);
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}
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positionProgress();
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if (specialDelegate) {
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clearWidgetsMode = true;
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}
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QAbstractItemView::updateGeometries();
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}
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bool FeedView::tryToCalculateGeometriesWithNoScrollbars(const QStyleOptionViewItem& option, const QAbstractItemModel* m, uint32_t totalHeight)
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{
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uint32_t previousOffset = 0;
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bool success = true;
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for (int i = 0, size = m->rowCount(); i < size; ++i) {
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QModelIndex index = m->index(i, 0, rootIndex());
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int height = itemDelegate(index)->sizeHint(option, index).height();
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if (previousOffset + height > totalHeight) {
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success = false;
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break;
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}
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hints.emplace_back(Hint({
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false,
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previousOffset,
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static_cast<uint32_t>(height)
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}));
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previousOffset += height;
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}
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return success;
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}
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void FeedView::paintEvent(QPaintEvent* event)
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{
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//qDebug() << "paint" << event->rect();
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const QAbstractItemModel* m = model();
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QWidget* vp = viewport();
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QRect zone = event->rect().translated(0, -vo);
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uint32_t vph = vp->height();
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int32_t y1 = zone.y();
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int32_t y2 = y1 + zone.height();
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bool inZone = false;
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std::deque<QModelIndex> toRener;
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for (std::deque<Hint>::size_type i = 0; i < hints.size(); ++i) {
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const Hint& hint = hints[i];
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int32_t relativeY1 = vph - hint.offset - hint.height;
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if (!inZone) {
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if (y2 > relativeY1) {
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inZone = true;
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}
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}
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if (inZone) {
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toRener.emplace_back(m->index(i, 0, rootIndex()));
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}
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if (y1 > relativeY1) {
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break;
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}
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}
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QPainter painter(vp);
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QStyleOptionViewItem option = viewOptions();
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option.features = QStyleOptionViewItem::WrapText;
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QPoint cursor = vp->mapFromGlobal(QCursor::pos());
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if (specialDelegate) {
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MessageDelegate* del = static_cast<MessageDelegate*>(itemDelegate());
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if (clearWidgetsMode) {
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del->beginClearWidgets();
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}
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}
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for (const QModelIndex& index : toRener) {
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option.rect = visualRect(index);
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bool mouseOver = option.rect.contains(cursor) && vp->rect().contains(cursor);
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option.state.setFlag(QStyle::State_MouseOver, mouseOver);
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itemDelegate(index)->paint(&painter, option, index);
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}
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if (clearWidgetsMode && specialDelegate) {
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MessageDelegate* del = static_cast<MessageDelegate*>(itemDelegate());
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del->endClearWidgets();
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clearWidgetsMode = false;
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}
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if (event->rect().height() == vp->height()) {
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// draw the blurred drop shadow...
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}
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}
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void FeedView::verticalScrollbarValueChanged(int value)
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{
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vo = verticalScrollBar()->maximum() - value;
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positionProgress();
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if (specialDelegate) {
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clearWidgetsMode = true;
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}
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if (modelState == Models::MessageFeed::incomplete && value < progressSize) {
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model()->fetchMore(rootIndex());
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}
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QAbstractItemView::verticalScrollbarValueChanged(vo);
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}
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void FeedView::mouseMoveEvent(QMouseEvent* event)
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{
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if (!isVisible()) {
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return;
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}
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QAbstractItemView::mouseMoveEvent(event);
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}
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void FeedView::resizeEvent(QResizeEvent* event)
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{
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QAbstractItemView::resizeEvent(event);
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positionProgress();
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emit resized();
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}
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void FeedView::positionProgress()
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{
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QSize layoutBounds = maximumViewportSize();
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int progressPosition = layoutBounds.height() - progressSize;
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std::deque<Hint>::size_type size = hints.size();
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if (size > 0) {
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const Hint& hint = hints[size - 1];
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progressPosition -= hint.offset + hint.height;
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}
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progressPosition += vo;
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progressPosition = qMin(progressPosition, 0);
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progress.move((width() - progressSize) / 2, progressPosition);
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}
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QFont FeedView::getFont() const
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{
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return viewOptions().font;
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}
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void FeedView::setItemDelegate(QAbstractItemDelegate* delegate)
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{
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if (specialDelegate) {
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MessageDelegate* del = static_cast<MessageDelegate*>(itemDelegate());
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disconnect(del, &MessageDelegate::buttonPushed, this, &FeedView::onMessageButtonPushed);
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disconnect(del, &MessageDelegate::invalidPath, this, &FeedView::onMessageInvalidPath);
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}
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QAbstractItemView::setItemDelegate(delegate);
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MessageDelegate* del = dynamic_cast<MessageDelegate*>(delegate);
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if (del) {
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specialDelegate = true;
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connect(del, &MessageDelegate::buttonPushed, this, &FeedView::onMessageButtonPushed);
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connect(del, &MessageDelegate::invalidPath, this, &FeedView::onMessageInvalidPath);
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} else {
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specialDelegate = false;
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}
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}
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void FeedView::setModel(QAbstractItemModel* p_model)
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{
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if (specialModel) {
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Models::MessageFeed* feed = static_cast<Models::MessageFeed*>(model());
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disconnect(feed, &Models::MessageFeed::syncStateChange, this, &FeedView::onModelSyncStateChange);
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}
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QAbstractItemView::setModel(p_model);
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Models::MessageFeed* feed = dynamic_cast<Models::MessageFeed*>(p_model);
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if (feed) {
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onModelSyncStateChange(feed->getSyncState());
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specialModel = true;
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connect(feed, &Models::MessageFeed::syncStateChange, this, &FeedView::onModelSyncStateChange);
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} else {
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onModelSyncStateChange(Models::MessageFeed::complete);
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specialModel = false;
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}
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}
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void FeedView::onMessageButtonPushed(const QString& messageId)
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{
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if (specialModel) {
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Models::MessageFeed* feed = static_cast<Models::MessageFeed*>(model());
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feed->downloadAttachment(messageId);
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}
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}
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void FeedView::onMessageInvalidPath(const QString& messageId)
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{
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if (specialModel) {
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Models::MessageFeed* feed = static_cast<Models::MessageFeed*>(model());
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feed->reportLocalPathInvalid(messageId);
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}
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}
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void FeedView::onModelSyncStateChange(Models::MessageFeed::SyncState state)
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{
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bool needToUpdateGeometry = false;
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if (modelState != state) {
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if (state == Models::MessageFeed::complete || modelState == Models::MessageFeed::complete) {
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needToUpdateGeometry = true;
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}
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modelState = state;
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if (state == Models::MessageFeed::syncing) {
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progress.show();
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progress.start();
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} else {
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progress.stop();
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progress.hide();
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}
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}
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if (needToUpdateGeometry) {
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scheduleDelayedItemsLayout();
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}
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}
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