[Interest] Globally Converting QTapAndHoldGesture to Mouse Double Click

Joshua Grauman jnfo-c at grauman.com
Fri Feb 22 23:05:38 CET 2013

That is a good thought, but I don't think that is the problem. I have a 
double click event handler on one of my widgets, and it's not even getting 
called. I would think that sending a double click event would cause the 
double click event handler to be called, so that's why I think that 
somehow I'm not sending the double click event correctly or somehow it 
isn't getting to the appropriate widget... Thanks.


> 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
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