+ if (event->type() == QEvent::Show) {
+ if (_invalidateFilter)
+ invalidateFilter();
+ }
+
+ return QGraphicsView::event(event);
+}
+
+
+void ChatView::resizeEvent(QResizeEvent *event)
+{
+ // if view is currently scrolled to bottom, we want it that way after resizing
+ bool atBottom = (_lastScrollbarPos == verticalScrollBar()->maximum());
+
+ QGraphicsView::resizeEvent(event);
+
+ // if scrolling to bottom, do it immediately.
+ if(atBottom)
+ {
+ // we can reduce viewport updates if we scroll to the bottom allready at the beginning
+ verticalScrollBar()->setValue(verticalScrollBar()->maximum());
+ }
+
+ scene()->updateForViewport(viewport()->width(), viewport()->height());
+ adjustSceneRect();
+
+ if(atBottom)
+ {
+ _lastScrollbarPos = verticalScrollBar()->maximum();
+ verticalScrollBar()->setValue(verticalScrollBar()->maximum());
+ }
+ checkChatLineCaches();
+}
+
+
+void ChatView::adjustSceneRect()
+{
+ // Workaround for QTBUG-6322
+ // If the viewport's sceneRect() is (almost) as wide as as the viewport itself,
+ // Qt wants to reserve space for scrollbars even if they're turned off, resulting in
+ // an ugly white space at the bottom of the ChatView.
+ // Since the view's scene's width actually doesn't matter at all, we just adjust it
+ // by some hopefully large enough value to avoid this problem.
+
+ setSceneRect(scene()->sceneRect().adjusted(0, 0, -25, 0));
+}
+
+
+void ChatView::mouseMoveWhileSelecting(const QPointF &scenePos)
+{
+ int y = (int)mapFromScene(scenePos).y();
+ _scrollOffset = 0;
+ if (y < 0)
+ _scrollOffset = y;
+ else if (y > height())
+ _scrollOffset = y - height();
+
+ if (_scrollOffset && !_scrollTimer.isActive())
+ _scrollTimer.start();
+}
+
+
+void ChatView::scrollTimerTimeout()
+{
+ // scroll view
+ QAbstractSlider *vbar = verticalScrollBar();
+ if (_scrollOffset < 0 && vbar->value() > 0)
+ vbar->setValue(qMax(vbar->value() + _scrollOffset, 0));
+ else if (_scrollOffset > 0 && vbar->value() < vbar->maximum())
+ vbar->setValue(qMin(vbar->value() + _scrollOffset, vbar->maximum()));
+}
+
+
+void ChatView::lastLineChanged(QGraphicsItem *chatLine, qreal offset)
+{
+ Q_UNUSED(chatLine)
+ // disabled until further testing/discussion
+ //if(!scene()->isScrollingAllowed())
+ // return;
+
+ QAbstractSlider *vbar = verticalScrollBar();
+ Q_ASSERT(vbar);
+ if (vbar->maximum() - vbar->value() <= (offset + 5) * _currentScaleFactor) { // 5px grace area
+ vbar->setValue(vbar->maximum());
+ }
+}
+
+
+void ChatView::verticalScrollbarChanged(int newPos)
+{
+ QAbstractSlider *vbar = verticalScrollBar();
+ Q_ASSERT(vbar);
+
+ // check for backlog request
+ if (newPos < _lastScrollbarPos) {
+ int relativePos = 100;
+ if (vbar->maximum() - vbar->minimum() != 0)
+ relativePos = (newPos - vbar->minimum()) * 100 / (vbar->maximum() - vbar->minimum());
+
+ if (relativePos < 20) {
+ scene()->requestBacklog();
+ }
+ }
+ _lastScrollbarPos = newPos;
+
+ // FIXME: Fugly workaround for the ChatView scrolling up 1px on buffer switch
+ if (vbar->maximum() - newPos <= 2)
+ vbar->setValue(vbar->maximum());
+}
+
+
+MsgId ChatView::lastMsgId() const
+{
+ if (!scene())
+ return {};
+
+ QAbstractItemModel *model = scene()->model();
+ if (!model || model->rowCount() == 0)
+ return {};
+
+ return model->index(model->rowCount() - 1, 0).data(MessageModel::MsgIdRole).value<MsgId>();