bool on_enter_notify_event (GdkEventCrossing*);
bool on_leave_notify_event (GdkEventCrossing*);
+ void reset_to_extents ();
+
void centre_on_click (GdkEventButton *);
void render (Cairo::RefPtr<Cairo::Context> const&, cairo_rectangle_t*);
void render_region (RegionView*, cairo_t*, double) const;