int get_visual_y() const;
/**
- * Gets the drag point of the row item.
+ * Drags the item to a delta relative to the drag point.
+ * @param delta the offset from the drag point.
*/
- QPoint point() const;
+ void drag_by(const QPoint &delta);
+
+ /**
+ * Gets the arrow-tip point of the row item marker.
+ * @param rect the rectangle of the header area.
+ */
+ QPoint point(const QRect &rect) const;
/**
* Computes the vertical extents of the contents of this row item.