void QWidget::dragLeaveEvent(QDragLeaveEvent * event) [virtual protected]
This event handler is called when a drag is in progress and the mouse leaves this widget. The event is passed in the event parameter.
See the Drag-and-drop documentation for an overview of how to provide drag-and-drop in your application.
See also QDrag and QDragLeaveEvent.
void QComboBox::hidePopup() [virtual]
看看这样行不:加入事件管理器OBj == list of items;event == hideEvent
void QWidget::hideEvent(QHideEvent * event) [virtual protected]
This event handler can be reimplemented in a subclass to receive widget hide events. The event is passed in the event parameter.
Hide events are sent to widgets immediately after they have been hidden.
尤其注意上面英文