Closing a QDialog launched from a mouseReleaseEvent RightClick causes a blank context menu to appear

Question

This has happened for every QDialog I pop that fires from either a mouseReleaseEvent on a QGraphicsItem or from a QContextMenu. I don't see what the issue is - the code is pretty simple..

...
void MyQGfxItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
{
    if(event->button() == Qt::RightButton)
    {
        MyDialog someDlg;
        if(someDlg.exec())
        {

        }
    }
}
...

As soon as the dialog is closed, either through OK or Cancel, an empty context menu appears where the event was triggered:

The blank item seems to control if my QDockWidget is hidden or visible.. Any idea what is going on? Numerous Google searches has left me stuck.

Edit - it looks like this only occurs if the Right mouse button is used..

Answer 1

Ha! Got it. It looks like the QMainWindow grabs Right-click events after everything is finished. Calling this->setContextMenuPolicy(Qt::NoContextMenu) in the QMainWindow suppressed it.

Answer 2

According to the docs for QEvent, you should accept() events you do not want propagated to the parent widget. So somewhere in your mouseReleaseEvent, you should just add

event->setAccepted(true);

or

event->accept();

Note that you might also need to put this code in your mousePressEvent, too.