[Qt-interest] QGraphicsView with QGestureEvent

[Raymond de Vries]

Hi Denis,

I was also following this thread and I tried the same, with 
QGraphicsWebView but even with your advice, I don't get the gesture 
events...

This is what you mean to do:
MTCanvas : public QGraphicsView
constructor
  viewport()->setAttribute(Qt::WA_AcceptTouchEvents);
  grabGesture(Qt::PanGesture);
  grabGesture(Qt::PinchGesture);
  grabGesture(Qt::SwipeGesture);
  etc
MTCancas::event() does receive Gesture events

MTWebBrowser : public QGraphicsWebView
constructor
  setAcceptTouchEvents(true);
  grabGesture(Qt::PanGesture);
  grabGesture(Qt::PinchGesture);
  grabGesture(Qt::SwipeGesture);
  etc
MTWebBrowser::event(QEvent *event) does not receive Gesture events

Is this supposed to work?

Thanks a lot, best regards
Raymond




Denis Dzyubenko wrote:
> Hi Elias,
>
> 2009/12/3 Elias Capito <elias.capito at gmail.com>:
>   
>> I want to do a multitouch application.
>>
>> I have a problem with the QGestureEvent on a QGraphicsObject item . I use
>> "grabGesture" on my item in constructor and i debug to see the input event.
>>
>> When I run the application, the QGestureEvent never appear, but if I use
>> QTouchEvent on item in place of QGestureEvent, with "setAcceptTouchEvent",
>> in my debug I can see the touch event.
>>
>> If I use QGestureEvent with a simple QWidget and I run it, I can see the
>> gesture event, so i think it's correct.
>>
>> It's the first time, that I use QGraphicsView, so I think i have miss
>> something.
>>
>> Anyone have an idea, why the QGestureEvent not appear on my item ?
>>     
>
> right now to get gesture events on a QGraphicsObject it should
> subscribe to a gesture _and_ the viewport of the graphicsview should
> also explicitly subscribe to the same gesture. Apparently it isn't
> documented right now, sorry about that. Anyway, I this will be
> improved in future versions of Qt so that you will not have to do that
> manually (thank god I forgot to document that, so we can change the
> behavior ;) )
>
> However for now you need to make sure the viewport also subscribes to
> the same gesture type.
>
>