[Interest] Globally Converting QTapAndHoldGesture to Mouse Double Click

[Tony Rietwyk]

Hi Josh, 

I think most widgets are expecting Press, Release, DoubleClick, Release
sequences.  

In my own code, I've had to set a flag on the double-click, then action it
on the following release.   This was where the double-click was to open
another dialog.  Without this, the release would trigger a click in the new
form, which the client did not want to occur.  

Maybe QInputMethod might be more appropriate in your case? 

Hope that helps. 

Tony


> Sent: Friday, 22 February 2013 4:36 PM
> 
> Hello all,
> 
> I'm trying to write a global proceedure to convert all QTapAndHoldGesture
> events to mouse double click events. I thought this should be trivial, but
it's
> really stumping me.
> 
> I setup an event filter globally for my QApplication and grab the gesture
as
> follow:
> app.installEventFilter(&myobj);
> mainWin->grabGesture(Qt::TapAndHoldGesture);
> 
> And then I have an event filter as follows:
> 
> bool myObject::eventFilter(QObject *obj, QEvent *e)
> {
>    if(e->type() == QEvent::Gesture)
>    {
>      QGestureEvent *event = static_cast<QGestureEvent*>(e);
>      if(QGesture *gest = event->gesture(Qt::TapAndHoldGesture))
>      {
>        QTapAndHoldGesture *tah = static_cast<QTapAndHoldGesture *>(gest);
>        QMouseEvent dblClk(QEvent::MouseButtonDblClick, tah-
> >position().toPoint(), Qt::LeftButton, Qt::LeftButton, Qt::NoModifier);
>        QApplication::sendEvent(obj, &dblClk);
>        return true;
>      }
>    }
> }
> 
> I receive the gesture events fine, but for some reason when none of my
> widgets receive the double click events. I've tried lots of different
> options for instantiating my QMouseEvent. I've tried calling grabMouse on
> the widget before sending the event, but still nothing receives double
> click events. Does anyone have an idea of why none of my widgets receive
> the double click events?
> 
> Thanks!
> 
> Josh