virtual void dragEnterEvent(QGraphicsSceneDragDropEvent *event);
virtual void dragLeaveEvent(QGraphicsSceneDragDropEvent *event);
virtual void dropEvent(QGraphicsSceneDragDropEvent *event);
virtual void dragEnterEvent(QGraphicsSceneDragDropEvent *event);
virtual void dragLeaveEvent(QGraphicsSceneDragDropEvent *event);
virtual void dropEvent(QGraphicsSceneDragDropEvent *event);