- /**
- * Drag the dragging items by the delta offset.
- * @param delta the drag offset in pixels.
- */
- virtual void drag_items(const QPoint &delta) = 0;
-
- /**
- * Handles left mouse button press events.
- * @param event the mouse event that triggered this handler.
- */
- void mouse_left_press_event(QMouseEvent *event);
-
- /**
- * Handles left mouse button release events.
- * @param event the mouse event that triggered this handler.
- */
- void mouse_left_release_event(QMouseEvent *event);
-