virtual void mouseMoveEvent(QGraphicsSceneMouseEvent *mouseEvent);
virtual void mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent);
virtual void mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent);
virtual void mouseMoveEvent(QGraphicsSceneMouseEvent *mouseEvent);
virtual void mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent);
virtual void mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent);