- void paintEvent(QPaintEvent *event);
- void mousePressEvent(QMouseEvent *event);
- void mouseReleaseEvent(QMouseEvent *event);
- void mouseMoveEvent(QMouseEvent *event);
- void wheelEvent(QWheelEvent *event);
+ virtual void paintEvent(QPaintEvent *event);
+ virtual void mousePressEvent(QMouseEvent *event);
+ virtual void mouseReleaseEvent(QMouseEvent *event);
+ virtual void mouseMoveEvent(QMouseEvent *event);
+ virtual void mouseDoubleClickEvent(QMouseEvent *event);
+ virtual void wheelEvent(QWheelEvent *event);