_scene = new ChatScene(filter, filter->idString(), viewport()->width() - 2, this); // see below: resizeEvent()
connect(_scene, SIGNAL(sceneRectChanged(const QRectF &)), this, SLOT(sceneRectChanged(const QRectF &)));
- connect(_scene, SIGNAL(lastLineChanged(QGraphicsItem *)), this, SLOT(lastLineChanged(QGraphicsItem *)));
+ connect(_scene, SIGNAL(lastLineChanged(QGraphicsItem *, qreal)), this, SLOT(lastLineChanged(QGraphicsItem *, qreal)));
setScene(_scene);
+ // installEventFilter(_scene);
connect(verticalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(verticalScrollbarChanged(int)));
}
void ChatView::resizeEvent(QResizeEvent *event) {
QGraphicsView::resizeEvent(event);
- // FIXME: without the hardcoded -2 Qt reserves space for a horizontal scrollbar even though it's disabled permanently.
+ // we can reduce viewport updates if we scroll to the bottom allready at the beginning
+ verticalScrollBar()->setValue(verticalScrollBar()->maximum());
+
+ // FIXME: without the hardcoded -4 Qt reserves space for a horizontal scrollbar even though it's disabled permanently.
// this does only occur on QtX11 (at least not on Qt for Mac OS). Seems like a Qt Bug.
- scene()->updateForViewport(viewport()->width() - 2, viewport()->height());
+ scene()->updateForViewport(viewport()->width() - 4, viewport()->height());
+
_lastScrollbarPos = verticalScrollBar()->maximum();
verticalScrollBar()->setValue(verticalScrollBar()->maximum());
}
-void ChatView::lastLineChanged(QGraphicsItem *chatLine) {
+void ChatView::lastLineChanged(QGraphicsItem *chatLine, qreal offset) {
+ Q_UNUSED(chatLine)
QAbstractSlider *vbar = verticalScrollBar();
Q_ASSERT(vbar);
- if(vbar->maximum() - vbar->value() <= chatLine->boundingRect().height() + 5) { // 5px grace area
+ if(vbar->maximum() - vbar->value() <= offset + 5) { // 5px grace area
vbar->setValue(vbar->maximum());
}
}