+ /**
+ * Returns true if the item is being dragged.
+ */
+ bool dragging() const;
+
+ /**
+ * Retunrns the current drag point.
+ */
+ QPoint drag_point() const;
+
+ /**
+ * Sets this item into the dragged state.
+ */
+ void drag();
+
+ /**
+ * Sets this item into the un-dragged state.
+ */
+ void drag_release();
+
+ /**
+ * Get the drag point.
+ */
+ virtual QPoint point() const = 0;
+