virtual void mousePressEvent(QGraphicsSceneMouseEvent*);
virtual void mouseReleaseEvent(QGraphicsSceneMouseEvent*);
virtual void mouseDoubleClickEvent(QGraphicsSceneMouseEvent* e);
virtual void mousePressEvent(QGraphicsSceneMouseEvent*);
virtual void mouseReleaseEvent(QGraphicsSceneMouseEvent*);
virtual void mouseDoubleClickEvent(QGraphicsSceneMouseEvent* e);