Hi Gunnar,
yeah, it helped. Thank you! When is qt jambi 4.5 releasing? Q3-4 of this
year?
Dawid
> Dawid Sip wrote:
>> Hi,
>> im playing alot with GraphicsView these days and I came accross a
>> following problem. I have a reimplemented QGraphicsView class where i
>> interecept the keyboardkeys:
>>
>> protected void keyPressEvent(QKeyEvent event){
>> event.accept();
>> if(event.key()==Qt.Key.Key_Control.value())
>> this.setDragMode(DragMode.ScrollHandDrag);
>> super.keyPressEvent(event);
>> }
>> protected void keyReleaseEvent(QKeyEvent event){
>> event.accept();
>> if(event.key()==Qt.Key.Key_Control.value())
>> this.setDragMode(DragMode.NoDrag);
>> super.keyReleaseEvent(event);
>> }
>>
>> I do this to achieve the following behaviour. When i press the ctrl
>> key i want the DragMode to change to ScrollHandDrag. Then, when I
>> press the left mouse key i can drag the viewport(scroll), when I'm
>> done scrolling i release the left mouse button afterwhich i release
>> the ctrl key. All works ok. But if I hit the following sequence of
>> keys, the behavior will break. I press the ctrl key and then press
>> the left mouse key, drag the view port and when I'm done I first
>> release the ctrl key and then release the left mouse key. When I then
>> want to repeat such scroll action the view port is drag as soon as I
>> hit ctrl key, and not even tougch the mouse keys... What is wrong?
>> Some ideas?
>
> Hi Dawid,
>
> This is caused by a bug in QGraphicsView. This will be fixed in Qt
> 4.5, and in the meantime you can work around this by "faking" a
> mouseRelease prior to unsetting the drag mode:
>
> protected void keyReleaseEvent(QKeyEvent event){
> event.accept();
> if(event.key()==Qt.Key.Key_Control.value()) {
> // Fake a mouse release...
> QEvent e = new QMouseEvent(QEvent.Type.MouseButtonRelease,
> new QPoint(0, 0),
> Qt.MouseButton.LeftButton,
> new Qt.MouseButtons(),
> new Qt.KeyboardModifiers());
> QApplication.sendEvent(viewport(), e);
> this.setDragMode(DragMode.NoDrag);
> }
> super.keyReleaseEvent(event);
> }
>
> Hope this helps.
>
> best regards,
> Gunnar
>
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