virtual void contextMenuEvent(QContextMenuEvent * event);
virtual void mouseDoubleClickEvent(QMouseEvent * event);
virtual void mousePressEvent(QMouseEvent *event);
+ virtual void mouseReleaseEvent(QMouseEvent *event);
virtual void mouseMoveEvent(QMouseEvent *event);
virtual void dragEnterEvent(QDragEnterEvent *event);
virtual void dropEvent(QDropEvent *event);