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  1. Qt
  2. QTBUG-40088

QTabletEvent pointerType not properly detected

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • Icon: P4: Low P4: Low
    • None
    • 5.3.1
    • GUI: Wacom Tablet Input
    • None
    • Qt 5.3.1, VS2013 x64, Windows 8.1 x64, Duo Sense Pen 2 (same stylus as Surface Pro 3)

      When the eraser mode of the pen is used, it is not properly reported as QTabletEvent::Eraser when querying pointerType().
      More precisely, it is only properly reported 20% on the time, seems random.

      Workaround:
      implement nativeEvent in your widget to retrieve the pen id:

      bool MyWidget::nativeEvent(const QByteArray &eventType, void *message, long *result)
{
#if defined(Q_OS_WIN32)
    if(eventType=="windows_generic_MSG")
    {
        MSG* msg=(MSG*)message;
        switch (msg->message)
        {
        case WM_POINTERENTER:
            penId=GET_POINTERID_WPARAM(msg->wParam);
            break;
        }
    }
    return false;
#endif
}

      then in tabletEvent, you can get the real pointer type this way:

      void MyWidget::tabletEvent(QTabletEvent *event)
{
#if defined(Q_OS_WIN32)
    POINTER_PEN_INFO penInfo;
    GetPointerPenInfo(penId,&penInfo);
    if(penInfo.penFlags&&PEN_FLAG_INVERTED || penInfo.penFlags&&PEN_FLAG_ERASER)
    {
        //eraser
    }
#endif
}

        1. qtbug40088_pointer.diff
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            srutledg Shawn Rutledge
            divide Robin Lobel
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              Created:
              Updated:

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