+ virtual VerboseCursor * verbose_cursor () const = 0;
+
+ virtual void get_pointer_position (double &, double &) const = 0;
+
+ virtual ARDOUR::Location* find_location_from_marker (Marker *, bool &) const = 0;
+ virtual Marker* find_marker_from_location_id (PBD::ID const &, bool) const = 0;
+
+ virtual void snap_to_with_modifier (framepos_t &, GdkEvent const *, int32_t direction = 0, bool for_mark = false) = 0;
+
+ virtual void get_regions_at (RegionSelection &, framepos_t where, TrackViewList const &) const = 0;