+ /** Called by the objects to update the update rectangle.
+ @param p a point to include in it
+ */
+ void SetUpdateRect(const wxPoint &p);
+ /// Invalidates the update rectangle.
+ void InvalidateUpdateRect(void) { m_UpdateRectValid = false; }
+ /// Returns the update rectangle.
+ const wxRect *GetUpdateRect(void) const { return &m_UpdateRect; }