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  1. Qt
  2. QTBUG-38046

QGesture issues on top of OS X



    • Bug
    • Resolution: Out of scope
    • P3: Somewhat important
    • None
    • 5.2.1
    • None
    • MacBookPro10,1, Mac OS X 10.9.2, Qt 5.2.1
      Ubuntu 12.04.4 LTS, X11 (no window manager or desktop environment, just xinit), Qt 5.2.1
    • macOS


      I'm developing a web browser supporting gestures to learn Qt.

      I have a class extending QGraphicsWebView to grab gesture and handle them properly. The original idea was to grab QPanGesture, QPinchGesture, and QSwipeGesture. Unfortunately, I could only see events of type QPinchGesture on OS X.

      I thought the problem was OS X's window manager, which is actually grabbing some gesture itself (3-fingers panning, 4-fingers swiping, etc.). I disabled all of the gesture (note: the tracking speed for my trackpad is set to highest possible value).
      This didn't solve anything, I could only see events of type QPinchGesture since the qDebug for QPanGesture and QSwipeGesture didn't get triggered.

      I then started grabbing both QTapGesture and QTapAndHoldGesture and I was surprised to see that pretty much every gesture I do get's recognized as a tap and hold!

      You can get the source code to reproduce the issue from this repository: https://github.com/filipposironi/nexo-browser/tree/pinchablewebview .

      I run the same application on Linux/X11 (without any kind of window manager) and I cannot even pinch to zoom (the only thing that's working on OS X) since I don't see any gesture even though xinput test-xi2, evtest, and mtdev-test show that multi-touch events make it from the kernel to the userspace.


        Issue Links



              srutledg Shawn Rutledge
              filippo.sironi Filippo Sironi
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