Qt: Detect Double-Click with Modkey (Shift, CTRL, etc.)

Question

How can I detect whether a double click on a QWidget (QStatusBar, in my case) occured while a modifier key was held down?

I can overload void QWidget::mouseDoubleClickEvent ( QMouseEvent * event ) to get the double click, but how can I sure whether the widget receives the key events when it might not have the focus?

score 2 · Accepted Answer · edited Oct 24 '13 at 18:12

2

I found the answer:

QMouseEvent is derived from QInputEvent and that has a method called modifiers():

From the Qt documentation:

Returns the keyboard modifier flags that existed immediately before the event occurred.

edited Oct 24 '13 at 18:12

Linville

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answered Feb 12 '10 at 14:22

fawick

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did you actually test this approach, Qt Doc states aswell that these are not 100% trustable. – drahnr Feb 12 '10 at 18:20
Yes, I have an event filter installed on a `QWidget` which casts the event into `QMouseEvent *` and tests two modifier keys in case the event is of type `QEvent::MouseButtonDblClick. Works like a charm... – fawick Feb 15 '10 at 10:50

score 1 · Answer 2 · answered Jul 28 '13 at 20:32

If you have a SLOT for your (Mouse)Event or Signal, you can test the modifiers there:

Qt::KeyboardModifiers modifiers  = QApplication::queryKeyboardModifiers ();
if(modifiers.testFlag( Qt::ControlModifier )){
  qDebug() << "CTRL was hold when this function was called";
}
else{
  qDebug() << "CTRL wasn't hold";
}

//SHIFT    = Qt::ShiftModifier
//CTRL     = Qt::ControlModifier
//ALT      = Qt::AltModifier

score 0 · Answer 3 · answered Apr 12 '12 at 21:05

0

Just to add More information in your QWidget you only need to override this method

protected:
    void mouseDoubleClickEvent(QMouseEvent *event);

cheers

answered Apr 12 '12 at 21:05

fredcrs

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Qt: Detect Double-Click with Modkey (Shift, CTRL, etc.)

3 Answers3