ChatView::ChatView(BufferId bufferId, QWidget *parent)
: QGraphicsView(parent),
- AbstractChatView()
+ AbstractChatView(),
+ _currentScaleFactor(1)
{
QList<BufferId> filterList;
filterList.append(bufferId);
ChatView::ChatView(MessageFilter *filter, QWidget *parent)
: QGraphicsView(parent),
- AbstractChatView()
+ AbstractChatView(),
+ _currentScaleFactor(1)
{
init(filter);
}
setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
setAlignment(Qt::AlignBottom);
setInteractive(true);
+ //setOptimizationFlags(QGraphicsView::DontClipPainter | QGraphicsView::DontAdjustForAntialiasing);
+ // setOptimizationFlags(QGraphicsView::DontAdjustForAntialiasing);
+ setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
+ // setTransformationAnchor(QGraphicsView::NoAnchor);
+ setTransformationAnchor(QGraphicsView::AnchorViewCenter);
- _scene = new ChatScene(filter, filter->idString(), this);
- connect(_scene, SIGNAL(heightChangedAt(qreal, qreal)), this, SLOT(sceneHeightChangedAt(qreal, qreal)));
+ _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 *, qreal)), this, SLOT(lastLineChanged(QGraphicsItem *, qreal)));
setScene(_scene);
+ // installEventFilter(_scene);
- _lastScrollbarPos = 0;
connect(verticalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(verticalScrollbarChanged(int)));
}
void ChatView::resizeEvent(QResizeEvent *event) {
- scene()->setWidth(event->size().width() - 2); // FIXME figure out why we have to hardcode the -2 here
+ QGraphicsView::resizeEvent(event);
+
+ // 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() - 4, viewport()->height());
+
+ _lastScrollbarPos = verticalScrollBar()->maximum();
verticalScrollBar()->setValue(verticalScrollBar()->maximum());
}
-void ChatView::sceneHeightChangedAt(qreal ypos, qreal hdiff) {
- setSceneRect(scene()->sceneRect());
- int y = mapFromScene(0, ypos).y();
- if(y <= viewport()->height() + 2) { // be a bit tolerant here, also FIXME (why we need the 2px?)
- verticalScrollBar()->setValue(verticalScrollBar()->value() + hdiff);
+void ChatView::lastLineChanged(QGraphicsItem *chatLine, qreal offset) {
+ Q_UNUSED(chatLine)
+ 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);
-
- // FIXME dirty hack to battle the "I just scroll up a pixel on hide()/show()" problem
- if(vbar->maximum() - vbar->value() < 5) vbar->setValue(vbar->maximum());
+ // check for backlog request
if(newPos < _lastScrollbarPos) {
int relativePos = 100;
if(vbar->maximum() - vbar->minimum() != 0)
return model->data(model->index(model->rowCount() - 1, 0), MessageModel::MsgIdRole).value<MsgId>();
}
+
+void ChatView::zoomIn() {
+ _currentScaleFactor *= 1.2;
+ scale(1.2, 1.2);
+ scene()->setWidth(viewport()->width() / _currentScaleFactor - 2);
+}
+
+void ChatView::zoomOut() {
+ _currentScaleFactor /= 1.2;
+ scale(1 / 1.2, 1 / 1.2);
+ scene()->setWidth(viewport()->width() / _currentScaleFactor - 2);
+}
+
+void ChatView::zoomNormal() {
+ scale(1/_currentScaleFactor, 1/_currentScaleFactor);
+ _currentScaleFactor = 1;
+ scene()->setWidth(viewport()->width() - 2);
+}