Handles mouse move events for the menu bar. Reimplemented from QWidget. Handles mouse press events for the menu bar. Reimplemented from QWidget. Handles mouse release events for the menu bar.
Handles resize events for the menu bar.
Reimplemented from QWidget. When a menubar is used above an unframed widget, it may look better with a separating line when displayed with WindowsStyle. Reimplemented from QWidget. For internal use only. Reimplemented from QMenuData.