livetrax/gtk2_ardour/editor.h

/*
    Copyright (C) 2000-2003 Paul Davis

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#ifndef __ardour_editor_h__
#define __ardour_editor_h__

#include <list>
#include <map>
#include <set>
#include <string>
#include <sys/time.h>

#include <boost/optional.hpp>

#include <libgnomecanvasmm/canvas.h>
#include <libgnomecanvasmm/group.h>
#include <libgnomecanvasmm/line.h>
#include <libgnomecanvasmm/pixbuf.h>

#include <cmath>

#include <gtkmm/comboboxtext.h>
#include <gtkmm/layout.h>

#include "gtkmm2ext/selector.h"
#include "gtkmm2ext/click_box.h"
#include "gtkmm2ext/dndtreeview.h"
#include "gtkmm2ext/stateful_button.h"
#include "gtkmm2ext/bindings.h"

#include "pbd/stateful.h"
#include "pbd/signals.h"

#include "ardour/import_status.h"
#include "ardour/tempo.h"
#include "ardour/location.h"
#include "ardour/types.h"

#include "gtk-custom-ruler.h"
#include "ardour_button.h"
#include "ardour_dialog.h"
#include "public_editor.h"
#include "editing.h"
#include "enums.h"
#include "editor_items.h"
#include "region_selection.h"
#include "canvas.h"
#include "window_proxy.h"

namespace Gnome { namespace Canvas {
	class NoEventText;
} }

namespace Gtkmm2ext {
	class TearOff;
	class Bindings;
}

namespace ARDOUR {
	class RouteGroup;
	class Playlist;
	class AudioPlaylist;
	class AudioRegion;
	class Region;
	class Location;
	class TempoSection;
	class NamedSelection;
	class Session;
	class Filter;
	class Crossfade;
	class ChanCount;
	class MidiOperator;
	class Track;
	class MidiTrack;
	class AudioTrack;
}

namespace LADSPA {
	class Plugin;
}

class AnalysisWindow;
class AudioClock;
class AudioRegionView;
class AudioStreamView;
class AudioTimeAxisView;
class AutomationLine;
class AutomationSelection;
class AutomationTimeAxisView;
class BundleManager;
class ButtonJoiner;
class ControlPoint;
class CrossfadeView;
class DragManager;
class GroupedButtons;
class GUIObjectState;
class Marker;
class MidiRegionView;
class MixerStrip;
class PlaylistSelector;
class PluginSelector;
class RhythmFerret;
class Selection;
class SoundFileOmega;
class StreamView;
class TempoLines;
class TimeAxisView;
class TimeFXDialog;
class TimeSelection;
class EditorGroupTabs;
class EditorRoutes;
class EditorRouteGroups;
class EditorRegions;
class EditorLocations;
class EditorSnapshots;
class EditorSummary;
class RegionLayeringOrderEditor;
class ProgressReporter;
class EditorCursor;
class MouseCursors;
class VerboseCursor;

/* <CMT Additions> */
class ImageFrameView;
class ImageFrameTimeAxisView;
class ImageFrameTimeAxis;
class MarkerTimeAxis ;
class MarkerView ;
class ImageFrameSocketHandler ;
class TimeAxisViewItem ;
/* </CMT Additions> */

class Editor : public PublicEditor, public PBD::ScopedConnectionList, public ARDOUR::SessionHandlePtr
{
  public:
	Editor ();
	~Editor ();

	void             set_session (ARDOUR::Session *);
	ARDOUR::Session* session() const { return _session; }

	void             first_idle ();
	virtual bool     have_idled () const { return _have_idled; }

	framepos_t leftmost_position() const { return leftmost_frame; }

	framecnt_t current_page_frames() const {
		return (framecnt_t) floor (_canvas_width * frames_per_unit);
	}

	double canvas_height () const {
		return _canvas_height;
	}

	void cycle_snap_mode ();
	void next_snap_choice ();
	void next_snap_choice_music_only ();
	void next_snap_choice_music_and_time ();
	void prev_snap_choice ();
	void prev_snap_choice_music_only ();
	void prev_snap_choice_music_and_time ();
	void set_snap_to (Editing::SnapType);
	void set_snap_mode (Editing::SnapMode);
	void set_snap_threshold (double pixel_distance) {snap_threshold = pixel_distance;}

	Editing::SnapMode  snap_mode () const;
	Editing::SnapType  snap_type () const;

	void undo (uint32_t n = 1);
	void redo (uint32_t n = 1);

	XMLNode& get_state ();
	int set_state (const XMLNode&, int version);

	void set_mouse_mode (Editing::MouseMode, bool force=true);
	void step_mouse_mode (bool next);
	Editing::MouseMode current_mouse_mode () const { return mouse_mode; }
	Editing::MidiEditMode current_midi_edit_mode () const;
	void remove_midi_note (ArdourCanvas::Item *, GdkEvent *);

	bool internal_editing() const { return _internal_editing ; }
	void set_internal_edit (bool yn);
	bool toggle_internal_editing_from_double_click (GdkEvent*);

#ifdef WITH_CMT
	void add_imageframe_time_axis(const std::string & track_name, void*) ;
	void add_imageframe_marker_time_axis(const std::string & track_name, TimeAxisView* marked_track, void*) ;
	void connect_to_image_compositor() ;
	void scroll_timeaxis_to_imageframe_item(const TimeAxisViewItem* item) ;
	TimeAxisView* get_named_time_axis(const std::string & name) ;
#endif /* WITH_CMT */

	void foreach_time_axis_view (sigc::slot<void,TimeAxisView&>);
	void add_to_idle_resize (TimeAxisView*, int32_t);

	RouteTimeAxisView* get_route_view_by_route_id (const PBD::ID& id) const;

	void consider_auditioning (boost::shared_ptr<ARDOUR::Region>);
	void hide_a_region (boost::shared_ptr<ARDOUR::Region>);
	void show_a_region (boost::shared_ptr<ARDOUR::Region>);

#ifdef USE_RUBBERBAND
	std::vector<std::string> rb_opt_strings;
	int rb_current_opt;
#endif

	/* things that need to be public to be used in the main menubar */

	void new_region_from_selection ();
	void separate_regions_between (const TimeSelection&);
	void separate_region_from_selection ();
	void separate_under_selected_regions ();
	void separate_region_from_punch ();
	void separate_region_from_loop ();
	void separate_regions_using_location (ARDOUR::Location&);
	void transition_to_rolling (bool forward);

	/* undo related */

	framepos_t unit_to_frame (double unit) const {
		return (framepos_t) rint (unit * frames_per_unit);
	}

	double frame_to_unit (framepos_t frame) const {
		return rint ((double) frame / (double) frames_per_unit);
	}

	double frame_to_unit (double frame) const {
		return rint (frame / frames_per_unit);
	}

	/* NOTE: these functions assume that the "pixel" coordinate is
	   the result of using the world->canvas affine transform on a
	   world coordinate. These coordinates already take into
	   account any scrolling carried out by adjusting the
	   xscroll_adjustment.
	*/

	framepos_t pixel_to_frame (double pixel) const {

		/* pixel can be less than zero when motion events
		   are processed. since we've already run the world->canvas
		   affine, that means that the location *really* is "off
		   to the right" and thus really is "before the start".
		*/

		if (pixel >= 0) {
			return (framepos_t) rint (pixel * frames_per_unit * GNOME_CANVAS(track_canvas->gobj())->pixels_per_unit);
		} else {
			return 0;
		}
	}

	gulong frame_to_pixel (framepos_t frame) const {
		return (gulong) rint ((frame / (frames_per_unit * GNOME_CANVAS(track_canvas->gobj())->pixels_per_unit)));
	}

	void flush_canvas ();

	/* selection */

	Selection& get_selection() const { return *selection; }
	Selection& get_cut_buffer() const { return *cut_buffer; }
	void track_mixer_selection ();

	bool extend_selection_to_track (TimeAxisView&);

	void play_selection ();
	void select_all_in_track (Selection::Operation op);
	void select_all (Selection::Operation op);
	void invert_selection_in_track ();
	void invert_selection ();
	void deselect_all ();
	long select_range (framepos_t, framepos_t);

	void set_selected_regionview_from_region_list (boost::shared_ptr<ARDOUR::Region> region, Selection::Operation op = Selection::Set);

	/* tempo */

	void set_show_measures (bool yn);
	bool show_measures () const { return _show_measures; }

	/* analysis window */

	void analyze_region_selection();
	void analyze_range_selection();

	/* export */

	void export_audio ();
	void stem_export ();
	void export_selection ();
	void export_range ();
	void export_region ();

	void add_toplevel_controls (Gtk::Container&);
	Gtk::HBox& get_status_bar_packer()  { return status_bar_hpacker; }

	void               set_zoom_focus (Editing::ZoomFocus);
	Editing::ZoomFocus get_zoom_focus () const { return zoom_focus; }
	double             get_current_zoom () const { return frames_per_unit; }

	void temporal_zoom_step (bool coarser);
	void tav_zoom_step (bool coarser);

	/* stuff that AudioTimeAxisView and related classes use */

	PlaylistSelector& playlist_selector() const;
	void clear_playlist (boost::shared_ptr<ARDOUR::Playlist>);

	void new_playlists (TimeAxisView* v);
	void copy_playlists (TimeAxisView* v);
	void clear_playlists (TimeAxisView* v);

	void get_onscreen_tracks (TrackViewList&);

	Width editor_mixer_strip_width;
	void maybe_add_mixer_strip_width (XMLNode&);
	void show_editor_mixer (bool yn);
	void create_editor_mixer ();
	void show_editor_list (bool yn);
	void set_selected_mixer_strip (TimeAxisView&);
	void mixer_strip_width_changed ();
	void hide_track_in_display (TimeAxisView* tv, bool apply_to_selection = false);

	/* nudge is initiated by transport controls owned by ARDOUR_UI */

	framecnt_t get_nudge_distance (framepos_t pos, framecnt_t& next);
	Evoral::MusicalTime get_grid_type_as_beats (bool& success, framepos_t position);

	void nudge_forward (bool next, bool force_playhead);
	void nudge_backward (bool next, bool force_playhead);

	/* nudge initiated from context menu */

	void nudge_forward_capture_offset ();
	void nudge_backward_capture_offset ();

	/* playhead/screen stuff */

	void set_stationary_playhead (bool yn);
	void toggle_stationary_playhead ();
	bool stationary_playhead() const { return _stationary_playhead; }

	void set_follow_playhead (bool yn, bool catch_up = true);
	void toggle_follow_playhead ();
	bool follow_playhead() const { return _follow_playhead; }
	bool dragging_playhead () const { return _dragging_playhead; }

	void toggle_zero_line_visibility ();
	void set_summary ();
	void set_group_tabs ();
	void toggle_measure_visibility ();
	void toggle_logo_visibility ();

	/* fades/xfades */

 	void toggle_region_fades (int dir);
 	void update_region_fade_visibility ();
	bool xfade_visibility() const { return _xfade_visibility; }
	void update_xfade_visibility ();

	/* redirect shared ops menu. caller must free returned menu */

	Gtk::Menu* redirect_menu ();

	/* floating windows/transient */

	void ensure_float (Gtk::Window&);

	void show_window ();

	void ensure_time_axis_view_is_visible (const TimeAxisView& tav);
	void scroll_tracks_down_line ();
	void scroll_tracks_up_line ();

	void prepare_for_cleanup ();
	void finish_cleanup ();

	void maximise_editing_space();
	void restore_editing_space();

	void reset_x_origin (framepos_t);
	void reset_x_origin_to_follow_playhead ();
	void reset_y_origin (double);
	void reset_zoom (double);
	void reposition_and_zoom (framepos_t, double);

	framepos_t get_preferred_edit_position (bool ignore_playhead = false, bool use_context_click = false);

	bool update_mouse_speed ();
	bool decelerate_mouse_speed ();

	void toggle_meter_updating();

	void show_rhythm_ferret();

	void goto_visual_state (uint32_t);
	void save_visual_state (uint32_t);

	void queue_draw_resize_line (int at);
	void start_resize_line_ops ();
	void end_resize_line_ops ();

	TrackViewList const & get_track_views () {
		return track_views;
	}

	int get_regionview_count_from_region_list (boost::shared_ptr<ARDOUR::Region>);

	void do_import (std::vector<std::string> paths, Editing::ImportDisposition, Editing::ImportMode mode, ARDOUR::SrcQuality, framepos_t&);
	void do_embed (std::vector<std::string> paths, Editing::ImportDisposition, Editing::ImportMode mode,  framepos_t&);

	void get_regions_corresponding_to (boost::shared_ptr<ARDOUR::Region> region, std::vector<RegionView*>& regions);

	void center_screen (framepos_t);

	TrackViewList axis_views_from_routes (boost::shared_ptr<ARDOUR::RouteList>) const;
	Gtkmm2ext::TearOff* mouse_mode_tearoff () const { return _mouse_mode_tearoff; }
	Gtkmm2ext::TearOff* tools_tearoff () const { return _tools_tearoff; }

	void snap_to (framepos_t& first, int32_t direction = 0, bool for_mark = false);
	void snap_to_with_modifier (framepos_t& first, GdkEvent const *, int32_t direction = 0, bool for_mark = false);
	void snap_to (framepos_t& first, framepos_t& last, int32_t direction = 0, bool for_mark = false);

	void begin_reversible_command (std::string cmd_name);
	void begin_reversible_command (GQuark);
	void commit_reversible_command ();

	DragManager* drags () const {
		return _drags;
	}

	void maybe_autoscroll (bool, bool, bool, bool);

	Gdk::Cursor* get_canvas_cursor () const { return current_canvas_cursor; }
	void set_canvas_cursor (Gdk::Cursor*, bool save=false);
	void set_current_trimmable (boost::shared_ptr<ARDOUR::Trimmable>);
	void set_current_movable (boost::shared_ptr<ARDOUR::Movable>);

	MouseCursors const * cursors () const {
		return _cursors;
	}

	VerboseCursor* verbose_cursor () const {
		return _verbose_cursor;
	}

	void get_pointer_position (double &, double &) const;

  protected:
	void map_transport_state ();
	void map_position_change (framepos_t);

	void on_realize();

  private:

	void color_handler ();

	bool                 constructed;

	// to keep track of the playhead position for control_scroll
	boost::optional<framepos_t> _control_scroll_target;

	PlaylistSelector* _playlist_selector;

	typedef std::pair<TimeAxisView*,XMLNode*> TAVState;

	struct VisualState {
	    VisualState (bool with_tracks);
	    ~VisualState ();
	    double              y_position;
	    double              frames_per_unit;
	    framepos_t          leftmost_frame;
	    Editing::ZoomFocus  zoom_focus;
	    GUIObjectState*     gui_state;
	};

	std::list<VisualState*> undo_visual_stack;
	std::list<VisualState*> redo_visual_stack;
	VisualState* current_visual_state (bool with_tracks = true);
	void undo_visual_state ();
	void redo_visual_state ();
	void use_visual_state (VisualState&);
	bool no_save_visual;
	void swap_visual_state ();

	std::vector<VisualState*> visual_states;
	void start_visual_state_op (uint32_t n);
	void cancel_visual_state_op (uint32_t n);

	framepos_t leftmost_frame;
	double      frames_per_unit;
	Editing::ZoomFocus zoom_focus;

	void set_frames_per_unit (double);
	void post_zoom ();

	Editing::MouseMode mouse_mode;
	Editing::MouseMode pre_internal_mouse_mode;
	Editing::SnapType  pre_internal_snap_type;
	Editing::SnapMode  pre_internal_snap_mode;
	Editing::SnapType  internal_snap_type;
	Editing::SnapMode  internal_snap_mode;
	bool _internal_editing;
	Editing::MouseMode effective_mouse_mode () const;

	enum JoinObjectRangeState {
		JOIN_OBJECT_RANGE_NONE,
		/** `join object/range' mode is active and the mouse is over a place where object mode should happen */
		JOIN_OBJECT_RANGE_OBJECT,
		/** `join object/range' mode is active and the mouse is over a place where range mode should happen */
		JOIN_OBJECT_RANGE_RANGE
	};

	JoinObjectRangeState _join_object_range_state;

	void update_join_object_range_location (double, double);

	boost::optional<int>  pre_notebook_shrink_pane_width;

	void pane_allocation_handler (Gtk::Allocation&, Gtk::Paned*);

	Gtk::Notebook _the_notebook;
	bool _notebook_shrunk;
	void add_notebook_page (std::string const &, Gtk::Widget &);
	bool notebook_tab_clicked (GdkEventButton *, Gtk::Widget *);

	Gtk::HPaned   edit_pane;
	Gtk::VPaned   editor_summary_pane;

	Gtk::EventBox meter_base;
	Gtk::HBox     meter_box;
	Gtk::EventBox marker_base;
	Gtk::HBox     marker_box;
	Gtk::VBox     scrollers_rulers_markers_box;

	void location_changed (ARDOUR::Location *);
	void location_flags_changed (ARDOUR::Location *, void *);
	void refresh_location_display ();
	void refresh_location_display_internal (ARDOUR::Locations::LocationList&);
	void add_new_location (ARDOUR::Location *);
	ArdourCanvas::Group* add_new_location_internal (ARDOUR::Location *);
	void location_gone (ARDOUR::Location *);
	void remove_marker (ArdourCanvas::Item&, GdkEvent*);
	gint really_remove_marker (ARDOUR::Location* loc);
	void goto_nth_marker (int nth);
	void toggle_marker_lines ();
	void set_marker_line_visibility (bool);

	uint32_t location_marker_color;
	uint32_t location_range_color;
	uint32_t location_loop_color;
	uint32_t location_punch_color;
	uint32_t location_cd_marker_color;

	struct LocationMarkers {
		Marker* start;
		Marker* end;
		bool    valid;

		LocationMarkers () : start(0), end(0), valid (true) {}

		~LocationMarkers ();

		void hide ();
		void show ();

		void set_show_lines (bool);
		void set_selected (bool);
		void canvas_height_set (double);
		void setup_lines ();

		void set_name (const std::string&);
		void set_position (framepos_t start, framepos_t end = 0);
		void set_color_rgba (uint32_t);
	};

	LocationMarkers  *find_location_markers (ARDOUR::Location *) const;
	ARDOUR::Location* find_location_from_marker (Marker *, bool& is_start) const;
	Marker* find_marker_from_location_id (PBD::ID const &, bool) const;
	Marker* entered_marker;
	bool _show_marker_lines;

	typedef std::map<ARDOUR::Location*,LocationMarkers *> LocationMarkerMap;
	LocationMarkerMap location_markers;

	void update_marker_labels ();
	void update_marker_labels (ArdourCanvas::Group *);
	void check_marker_label (Marker *);

	/** A set of lists of Markers that are in each of the canvas groups
	 *  for the marker sections at the top of the editor.  These lists
	 *  are kept sorted in time order between marker movements, so that after
	 *  a marker has moved we can decide whether we need to update the labels
	 *  for all markers or for just a few.
	 */
	std::map<ArdourCanvas::Group *, std::list<Marker *> > _sorted_marker_lists;
	void remove_sorted_marker (Marker *);

	void hide_marker (ArdourCanvas::Item*, GdkEvent*);
	void clear_marker_display ();
	void mouse_add_new_marker (framepos_t where, bool is_cd=false, bool is_xrun=false);
	bool choose_new_marker_name(std::string &name);
	void update_cd_marker_display ();
	void ensure_cd_marker_updated (LocationMarkers * lam, ARDOUR::Location * location);

	TimeAxisView*      clicked_axisview;
	RouteTimeAxisView* clicked_routeview;
	/** The last RegionView that was clicked on, or 0 if the last click was not
	 * on a RegionView.  This is set up by the canvas event handlers in
	 * editor_canvas_events.cc
	 */
	RegionView*        clicked_regionview;
	RegionSelection    latest_regionviews;
	uint32_t           clicked_selection;
	CrossfadeView*     clicked_crossfadeview;
	ControlPoint*      clicked_control_point;

	void sort_track_selection (TrackViewList&);

	void get_equivalent_regions (RegionView* rv, std::vector<RegionView*> &, PBD::PropertyID) const;
	RegionSelection get_equivalent_regions (RegionSelection &, PBD::PropertyID) const;
	std::vector<boost::shared_ptr<ARDOUR::Crossfade> > get_equivalent_crossfades (
		RouteTimeAxisView&, boost::shared_ptr<ARDOUR::Crossfade>, PBD::PropertyID
		) const;
	void mapover_tracks (sigc::slot<void,RouteTimeAxisView&,uint32_t> sl, TimeAxisView*, PBD::PropertyID) const;
	void mapover_tracks_with_unique_playlists (sigc::slot<void,RouteTimeAxisView&,uint32_t> sl, TimeAxisView*, PBD::PropertyID) const;

	/* functions to be passed to mapover_tracks(), possibly with sigc::bind()-supplied arguments */
	void mapped_get_equivalent_regions (RouteTimeAxisView&, uint32_t, RegionView *, std::vector<RegionView*>*) const;
	void mapped_use_new_playlist (RouteTimeAxisView&, uint32_t, std::vector<boost::shared_ptr<ARDOUR::Playlist> > const &);
	void mapped_use_copy_playlist (RouteTimeAxisView&, uint32_t, std::vector<boost::shared_ptr<ARDOUR::Playlist> > const &);
	void mapped_clear_playlist (RouteTimeAxisView&, uint32_t);
	void mapped_get_equivalent_crossfades (
		RouteTimeAxisView&, uint32_t, boost::shared_ptr<ARDOUR::Crossfade>, std::vector<boost::shared_ptr<ARDOUR::Crossfade> >*
		) const;
	
	void button_selection (ArdourCanvas::Item* item, GdkEvent* event, ItemType item_type);
	bool button_release_can_deselect;

	void catch_vanishing_regionview (RegionView *);

	void set_selected_track (TimeAxisView&, Selection::Operation op = Selection::Set, bool no_remove=false);
	void select_all_tracks ();
	void select_all_internal_edit (Selection::Operation);

	bool set_selected_control_point_from_click (Selection::Operation op = Selection::Set, bool no_remove=false);
	void set_selected_track_from_click (bool press, Selection::Operation op = Selection::Set, bool no_remove=false);
	void set_selected_track_as_side_effect (Selection::Operation op);
	bool set_selected_regionview_from_click (bool press, Selection::Operation op = Selection::Set);

	bool set_selected_regionview_from_map_event (GdkEventAny*, StreamView*, boost::weak_ptr<ARDOUR::Region>);
	void collect_new_region_view (RegionView *);
	void collect_and_select_new_region_view (RegionView *);

	Gtk::Menu track_context_menu;
	Gtk::Menu track_region_context_menu;
	Gtk::Menu track_selection_context_menu;
	Gtk::Menu track_crossfade_context_menu;

	Gtk::MenuItem* region_edit_menu_split_item;
	Gtk::MenuItem* region_edit_menu_split_multichannel_item;
	Gtk::Menu * track_region_edit_playlist_menu;
	Gtk::Menu * track_edit_playlist_submenu;
	Gtk::Menu * track_selection_edit_playlist_submenu;

	GdkEvent context_click_event;

	void popup_track_context_menu (int, int, ItemType, bool);
	Gtk::Menu* build_track_context_menu ();
	Gtk::Menu* build_track_bus_context_menu ();
	Gtk::Menu* build_track_region_context_menu ();
	Gtk::Menu* build_track_crossfade_context_menu ();
	Gtk::Menu* build_track_selection_context_menu ();
	void add_dstream_context_items (Gtk::Menu_Helpers::MenuList&);
	void add_bus_context_items (Gtk::Menu_Helpers::MenuList&);
	void add_region_context_items (Gtk::Menu_Helpers::MenuList&, boost::shared_ptr<ARDOUR::Track>);
	void add_crossfade_context_items (AudioStreamView*, boost::shared_ptr<ARDOUR::Crossfade>, Gtk::Menu_Helpers::MenuList&, bool many);
	void add_selection_context_items (Gtk::Menu_Helpers::MenuList&);
	Gtk::MenuItem* _popup_region_menu_item;

	void popup_control_point_context_menu (ArdourCanvas::Item *, GdkEvent *);
	Gtk::Menu _control_point_context_menu;

	void handle_new_route (ARDOUR::RouteList&);
	void timeaxisview_deleted (TimeAxisView *);

	Gtk::HBox           global_hpacker;
	Gtk::VBox           global_vpacker;
	Gtk::VBox           vpacker;

	Gdk::Cursor*          current_canvas_cursor;
	Gdk::Cursor* which_grabber_cursor ();
	void set_canvas_cursor ();

	ArdourCanvas::Canvas* track_canvas;
	bool within_track_canvas;

	friend class VerboseCursor;
	VerboseCursor* _verbose_cursor;

	void parameter_changed (std::string);

	bool track_canvas_motion (GdkEvent*);

	Gtk::EventBox             time_canvas_event_box;
	Gtk::EventBox             track_canvas_event_box;
	Gtk::EventBox             time_button_event_box;
	Gtk::EventBox             ruler_label_event_box;

	ArdourCanvas::Group      *minsec_group;
	ArdourCanvas::Pixbuf     *logo_item;
	ArdourCanvas::Group      *bbt_group;
	ArdourCanvas::Group      *timecode_group;
	ArdourCanvas::Group      *frame_group;
	ArdourCanvas::Group      *tempo_group;
	ArdourCanvas::Group      *meter_group;
	ArdourCanvas::Group      *marker_group;
	ArdourCanvas::Group      *range_marker_group;
	ArdourCanvas::Group      *transport_marker_group;
	ArdourCanvas::Group*      cd_marker_group;

	ArdourCanvas::Group*      timebar_group;

	/* These bars never need to be scrolled */
	ArdourCanvas::Group*      meter_bar_group;
	ArdourCanvas::Group*      tempo_bar_group;
	ArdourCanvas::Group*      marker_bar_group;
	ArdourCanvas::Group*      range_marker_bar_group;
	ArdourCanvas::Group*      transport_marker_bar_group;
	ArdourCanvas::Group*      cd_marker_bar_group;

	/** The group containing all items that require horizontal scrolling. */
	ArdourCanvas::Group* _background_group;
	/*
	   The _master_group is the group containing all items
	   that require horizontal scrolling..
	   It is primarily used to separate canvas items
	   that require horizontal scrolling from those that do not.
	*/
	ArdourCanvas::Group* _master_group;

	/* The group containing all trackviews.  Only scrolled vertically. */
	ArdourCanvas::Group* _trackview_group;

	/* The group used for region motion.  Sits on top of _trackview_group */
	ArdourCanvas::Group* _region_motion_group;

	enum RulerType {
		ruler_metric_timecode = 0,
		ruler_metric_bbt = 1,
		ruler_metric_samples = 2,
		ruler_metric_minsec = 3,

		ruler_time_tempo = 4,
		ruler_time_meter = 5,
		ruler_time_marker = 6,
		ruler_time_range_marker = 7,
		ruler_time_transport_marker = 8,
		ruler_time_cd_marker = 9,
	};

	static GtkCustomMetric ruler_metrics[4];
	Glib::RefPtr<Gtk::ToggleAction> ruler_timecode_action;
	Glib::RefPtr<Gtk::ToggleAction> ruler_bbt_action;
	Glib::RefPtr<Gtk::ToggleAction> ruler_samples_action;
	Glib::RefPtr<Gtk::ToggleAction> ruler_minsec_action;
	Glib::RefPtr<Gtk::ToggleAction> ruler_tempo_action;
	Glib::RefPtr<Gtk::ToggleAction> ruler_meter_action;
	Glib::RefPtr<Gtk::ToggleAction> ruler_marker_action;
	Glib::RefPtr<Gtk::ToggleAction> ruler_range_action;
	Glib::RefPtr<Gtk::ToggleAction> ruler_loop_punch_action;
	Glib::RefPtr<Gtk::ToggleAction> ruler_cd_marker_action;
	bool                            no_ruler_shown_update;

	bool ruler_button_press (GdkEventButton*);
	bool ruler_button_release (GdkEventButton*);
	bool ruler_mouse_motion (GdkEventMotion*);
	bool ruler_scroll (GdkEventScroll* event);

	Gtk::Widget * ruler_grabbed_widget;

	void initialize_rulers ();
	void update_just_timecode ();
	void compute_fixed_ruler_scale (); //calculates the RulerScale of the fixed rulers
	void update_fixed_rulers ();
	void update_tempo_based_rulers ();
	void popup_ruler_menu (framepos_t where = 0, ItemType type = RegionItem);
	void update_ruler_visibility ();
	void set_ruler_visible (RulerType, bool);
	void toggle_ruler_visibility (RulerType rt);
	void ruler_toggled (int);
	bool ruler_label_button_release (GdkEventButton*);
	void store_ruler_visibility ();
	void restore_ruler_visibility ();

	static gint _metric_get_timecode (GtkCustomRulerMark **, gdouble, gdouble, gint);
	static gint _metric_get_bbt (GtkCustomRulerMark **, gdouble, gdouble, gint);
	static gint _metric_get_samples (GtkCustomRulerMark **, gdouble, gdouble, gint);
	static gint _metric_get_minsec (GtkCustomRulerMark **, gdouble, gdouble, gint);

	enum MinsecRulerScale {
		minsec_show_seconds,
		minsec_show_minutes,
		minsec_show_hours,
		minsec_show_frames
	};

	MinsecRulerScale minsec_ruler_scale;

	framecnt_t minsec_mark_interval;
	gint minsec_mark_modulo;
	gint minsec_nmarks;
	void set_minsec_ruler_scale (framepos_t, framepos_t);

	enum TimecodeRulerScale {
		timecode_show_bits,
		timecode_show_frames,
		timecode_show_seconds,
		timecode_show_minutes,
		timecode_show_hours
	};

	TimecodeRulerScale timecode_ruler_scale;

	gint timecode_mark_modulo;
	gint timecode_nmarks;
	void set_timecode_ruler_scale (framepos_t, framepos_t);

	framecnt_t _samples_ruler_interval;
	void set_samples_ruler_scale (framepos_t, framepos_t);

	enum BBTRulerScale {
		bbt_over,
		bbt_show_64,
		bbt_show_16,
		bbt_show_4,
		bbt_show_1,
		bbt_show_beats,
		bbt_show_ticks,
		bbt_show_ticks_detail,
		bbt_show_ticks_super_detail
	};

	BBTRulerScale bbt_ruler_scale;

	uint32_t bbt_bars;
	gint bbt_nmarks;
	uint32_t bbt_bar_helper_on;
	uint32_t bbt_accent_modulo;
	void compute_bbt_ruler_scale (framepos_t lower, framepos_t upper);

	gint metric_get_timecode (GtkCustomRulerMark **, gdouble, gdouble, gint);
	gint metric_get_bbt (GtkCustomRulerMark **, gdouble, gdouble, gint);
	gint metric_get_samples (GtkCustomRulerMark **, gdouble, gdouble, gint);
	gint metric_get_minsec (GtkCustomRulerMark **, gdouble, gdouble, gint);

	Gtk::Widget        *_ruler_separator;
	GtkWidget          *_timecode_ruler;
	GtkWidget          *_bbt_ruler;
	GtkWidget          *_samples_ruler;
	GtkWidget          *_minsec_ruler;
	Gtk::Widget        *timecode_ruler;
	Gtk::Widget        *bbt_ruler;
	Gtk::Widget        *samples_ruler;
	Gtk::Widget        *minsec_ruler;
	static Editor      *ruler_editor;

	static const double timebar_height;
	guint32 visible_timebars;
	gdouble canvas_timebars_vsize;
	gdouble get_canvas_timebars_vsize () const { return canvas_timebars_vsize; }
	Gtk::Menu          *editor_ruler_menu;

	ArdourCanvas::SimpleRect* tempo_bar;
	ArdourCanvas::SimpleRect* meter_bar;
	ArdourCanvas::SimpleRect* marker_bar;
	ArdourCanvas::SimpleRect* range_marker_bar;
	ArdourCanvas::SimpleRect* transport_marker_bar;
	ArdourCanvas::SimpleRect* cd_marker_bar;

	Gtk::Label  minsec_label;
	Gtk::Label  bbt_label;
	Gtk::Label  timecode_label;
	Gtk::Label  samples_label;
	Gtk::Label  tempo_label;
	Gtk::Label  meter_label;
	Gtk::Label  mark_label;
	Gtk::Label  range_mark_label;
	Gtk::Label  transport_mark_label;
	Gtk::Label  cd_mark_label;

	Gtk::VBox          time_button_vbox;
	Gtk::HBox          time_button_hbox;

	friend class EditorCursor;

	EditorCursor*        playhead_cursor;
	ArdourCanvas::Group* cursor_group;

	framepos_t get_region_boundary (framepos_t pos, int32_t dir, bool with_selection, bool only_onscreen);

	void    cursor_to_region_boundary (bool with_selection, int32_t dir);
	void    cursor_to_next_region_boundary (bool with_selection);
	void    cursor_to_previous_region_boundary (bool with_selection);
	void    cursor_to_next_region_point (EditorCursor*, ARDOUR::RegionPoint);
	void    cursor_to_previous_region_point (EditorCursor*, ARDOUR::RegionPoint);
	void    cursor_to_region_point (EditorCursor*, ARDOUR::RegionPoint, int32_t dir);
	void    cursor_to_selection_start (EditorCursor *);
	void    cursor_to_selection_end   (EditorCursor *);

	void    selected_marker_to_region_boundary (bool with_selection, int32_t dir);
	void    selected_marker_to_next_region_boundary (bool with_selection);
	void    selected_marker_to_previous_region_boundary (bool with_selection);
	void    selected_marker_to_next_region_point (ARDOUR::RegionPoint);
	void    selected_marker_to_previous_region_point (ARDOUR::RegionPoint);
	void    selected_marker_to_region_point (ARDOUR::RegionPoint, int32_t dir);
	void    selected_marker_to_selection_start ();
	void    selected_marker_to_selection_end   ();

	void    select_all_selectables_using_cursor (EditorCursor *, bool);
	void    select_all_selectables_using_edit (bool);
	void    select_all_selectables_between (bool within);
	void    select_range_between ();

	boost::shared_ptr<ARDOUR::Region> find_next_region (ARDOUR::framepos_t, ARDOUR::RegionPoint, int32_t dir, TrackViewList&, TimeAxisView ** = 0);
	ARDOUR::framepos_t find_next_region_boundary (ARDOUR::framepos_t, int32_t dir, const TrackViewList&);

	std::vector<ARDOUR::framepos_t> region_boundary_cache;
	void build_region_boundary_cache ();

	Gtk::HBox           top_hbox;
	Gtk::HBox           bottom_hbox;

	Gtk::Table          edit_packer;

	Gtk::Adjustment     vertical_adjustment;

	Gtk::Layout         controls_layout;
	bool control_layout_scroll (GdkEventScroll* ev);
	void reset_controls_layout_width ();
	void reset_controls_layout_height (int32_t height);

	enum Direction {
		LEFT,
		RIGHT,
		UP,
		DOWN
	};

	bool scroll_press (Direction);
	void scroll_release ();
	sigc::connection _scroll_connection;
	int _scroll_callbacks;

	double _canvas_width;
	double _canvas_height; ///< height of the visible area of the track canvas
	double full_canvas_height; ///< full height of the canvas

	bool track_canvas_map_handler (GdkEventAny*);

	bool edit_controls_button_release (GdkEventButton*);
	Gtk::Menu *edit_controls_left_menu;
	Gtk::Menu *edit_controls_right_menu;

	Gtk::VBox           ruler_label_vbox;
	Gtk::VBox           track_canvas_vbox;
	Gtk::VBox           time_canvas_vbox;
	Gtk::VBox           edit_controls_vbox;
	Gtk::HBox           edit_controls_hbox;

	void control_scroll (float);
	void control_select (uint32_t rid);
	void access_action (std::string,std::string);
	bool deferred_control_scroll (framepos_t);
	sigc::connection control_scroll_connection;

	gdouble get_trackview_group_vertical_offset () const { return vertical_adjustment.get_value () - canvas_timebars_vsize;}

	ArdourCanvas::Group* get_background_group () const { return _background_group; }
	ArdourCanvas::Group* get_trackview_group () const { return _trackview_group; }
	double last_trackview_group_vertical_offset;
	void tie_vertical_scrolling ();
	void set_horizontal_position (double);
	double horizontal_position () const;
	void scroll_canvas_vertically ();

	struct VisualChange {
		enum Type {
			TimeOrigin = 0x1,
			ZoomLevel = 0x2,
			YOrigin = 0x4
		};

		Type pending;
		framepos_t time_origin;
		double frames_per_unit;
		double y_origin;

		int idle_handler_id;

		VisualChange() : pending ((VisualChange::Type) 0), time_origin (0), frames_per_unit (0), idle_handler_id (-1) {}
		void add (Type t) {
			pending = Type (pending | t);
		}
	};


	VisualChange pending_visual_change;

	static int _idle_visual_changer (void *arg);
	int idle_visual_changer ();

	void queue_visual_change (framepos_t);
	void queue_visual_change (double);
	void queue_visual_change_y (double);
	void ensure_visual_change_idle_handler ();

	/* track views */
	TrackViewList track_views;
	std::pair<TimeAxisView*, double> trackview_by_y_position (double);
	TimeAxisView* axis_view_from_route (boost::shared_ptr<ARDOUR::Route>) const;

	TrackViewList get_tracks_for_range_action () const;

	sigc::connection super_rapid_screen_update_connection;
	framepos_t last_update_frame;
	void center_screen_internal (framepos_t, float);

	void super_rapid_screen_update ();

	void session_going_away ();

	framepos_t cut_buffer_start;
	framecnt_t cut_buffer_length;

	Gdk::Cursor* pre_press_cursor;
	boost::weak_ptr<ARDOUR::Trimmable> _trimmable;
	boost::weak_ptr<ARDOUR::Movable> _movable;

	bool typed_event (ArdourCanvas::Item*, GdkEvent*, ItemType);
	bool button_press_handler (ArdourCanvas::Item*, GdkEvent*, ItemType);
	bool button_press_handler_1 (ArdourCanvas::Item *, GdkEvent *, ItemType);
	bool button_press_handler_2 (ArdourCanvas::Item *, GdkEvent *, ItemType);
	bool button_release_handler (ArdourCanvas::Item*, GdkEvent*, ItemType);
	bool button_press_dispatch (GdkEventButton*);
	bool button_release_dispatch (GdkEventButton*);
	bool motion_handler (ArdourCanvas::Item*, GdkEvent*, bool from_autoscroll = false);
	bool enter_handler (ArdourCanvas::Item*, GdkEvent*, ItemType);
	bool leave_handler (ArdourCanvas::Item*, GdkEvent*, ItemType);
	bool key_press_handler (ArdourCanvas::Item*, GdkEvent*, ItemType);
	bool key_release_handler (ArdourCanvas::Item*, GdkEvent*, ItemType);

	Gtkmm2ext::Bindings* button_bindings;
	XMLNode* button_settings () const;

	/* KEYMAP HANDLING */

	void register_actions ();
	void register_region_actions ();

        void load_bindings ();
        Gtkmm2ext::ActionMap editor_action_map;
        Gtkmm2ext::Bindings  key_bindings;

	int ensure_cursor (framepos_t* pos);

	void cut_copy (Editing::CutCopyOp);
	bool can_cut_copy () const;
	void cut_copy_points (Editing::CutCopyOp);
	void cut_copy_regions (Editing::CutCopyOp, RegionSelection&);
	void cut_copy_ranges (Editing::CutCopyOp);
	void cut_copy_midi (Editing::CutCopyOp);

	void mouse_paste ();
	void paste_internal (framepos_t position, float times);

	/* EDITING OPERATIONS */

	void reset_point_selection ();
	void toggle_region_lock ();
	void toggle_opaque_region ();
	void toggle_record_enable ();
	void toggle_solo ();
	void toggle_solo_isolate ();
	void toggle_mute ();
	void toggle_region_lock_style ();

	enum LayerOperation {
		Raise,
		RaiseToTop,
		Lower,
		LowerToBottom
	};

	void do_layer_operation (LayerOperation);
	void raise_region ();
	void raise_region_to_top ();
	void change_region_layering_order (bool from_context_menu);
	void lower_region ();
	void lower_region_to_bottom ();
	void split_regions_at (framepos_t, RegionSelection&);
	void split_region_at_transients ();
	void split_region_at_points (boost::shared_ptr<ARDOUR::Region>, ARDOUR::AnalysisFeatureList&, bool can_ferret, bool select_new = false);
	void crop_region_to_selection ();
	void crop_region_to (framepos_t start, framepos_t end);
	void set_sync_point (framepos_t, const RegionSelection&);
	void set_region_sync_position ();
	void remove_region_sync();
	void align_regions (ARDOUR::RegionPoint);
	void align_regions_relative (ARDOUR::RegionPoint point);
	void align_region (boost::shared_ptr<ARDOUR::Region>, ARDOUR::RegionPoint point, framepos_t position);
	void align_region_internal (boost::shared_ptr<ARDOUR::Region>, ARDOUR::RegionPoint point, framepos_t position);
	void remove_selected_regions ();
	void remove_clicked_region ();
	void show_region_properties ();
	void show_midi_list_editor ();
	void rename_region ();
	void duplicate_some_regions (RegionSelection&, float times);
	void duplicate_selection (float times);
	void region_fill_selection ();
	void combine_regions ();
	void uncombine_regions ();

	void region_fill_track ();
	void audition_playlist_region_standalone (boost::shared_ptr<ARDOUR::Region>);
	void audition_playlist_region_via_route (boost::shared_ptr<ARDOUR::Region>, ARDOUR::Route&);
	void split_multichannel_region();
	void reverse_region ();
	void strip_region_silence ();
	void normalize_region ();
	void reset_region_scale_amplitude ();
	void adjust_region_gain (bool up);
	void quantize_region ();
	void insert_patch_change (bool from_context);
	void fork_region ();

	void do_insert_time ();
	void insert_time (framepos_t, framecnt_t, Editing::InsertTimeOption, bool, bool, bool, bool, bool, bool);

	void tab_to_transient (bool forward);

	void set_tempo_from_region ();
	void use_range_as_bar ();

	void define_one_bar (framepos_t start, framepos_t end);

	void audition_region_from_region_list ();
	void hide_region_from_region_list ();
	void show_region_in_region_list ();

	void naturalize_region ();

	void reset_focus ();

	void split_region ();

	void delete_ ();
	void cut ();
	void copy ();
	void paste (float times, bool from_context_menu = false);

	void place_transient ();
	void remove_transient (ArdourCanvas::Item* item);
	void snap_regions_to_grid ();
	void close_region_gaps ();

	void keyboard_paste ();

	void region_from_selection ();
	void create_region_from_selection (std::vector<boost::shared_ptr<ARDOUR::Region> >&);

	void play_from_start ();
	void play_from_edit_point ();
	void play_from_edit_point_and_return ();
	void play_selected_region ();
	void play_edit_range ();
	void play_location (ARDOUR::Location&);
	void loop_location (ARDOUR::Location&);

	void temporal_zoom_selection ();
	void temporal_zoom_region (bool both_axes);
	void zoom_to_region (bool both_axes);
	void temporal_zoom_session ();
	void temporal_zoom (gdouble scale);
	void temporal_zoom_by_frame (framepos_t start, framepos_t end, const std::string & op);
	void temporal_zoom_to_frame (bool coarser, framepos_t frame);

	void insert_region_list_drag (boost::shared_ptr<ARDOUR::Region>, int x, int y);
	void insert_region_list_selection (float times);

	void insert_route_list_drag (boost::shared_ptr<ARDOUR::Route>, int x, int y);

	/* import & embed */

	void add_external_audio_action (Editing::ImportMode);
	void external_audio_dialog ();
	void session_import_dialog ();

	int  check_whether_and_how_to_import(std::string, bool all_or_nothing = true);
	bool check_multichannel_status (const std::vector<std::string>& paths);

	SoundFileOmega* sfbrowser;

	void bring_in_external_audio (Editing::ImportMode mode,  framepos_t& pos);

	bool  idle_drop_paths  (std::vector<std::string> paths, framepos_t frame, double ypos);
	void  drop_paths_part_two  (const std::vector<std::string>& paths, framepos_t frame, double ypos);

	int  import_sndfiles (std::vector<std::string> paths, Editing::ImportMode mode,  ARDOUR::SrcQuality, framepos_t& pos,
			      int target_regions, int target_tracks, boost::shared_ptr<ARDOUR::Track>&, bool);
	int  embed_sndfiles (std::vector<std::string> paths, bool multiple_files, bool& check_sample_rate, Editing::ImportMode mode,
			     framepos_t& pos, int target_regions, int target_tracks, boost::shared_ptr<ARDOUR::Track>&);

	int add_sources (std::vector<std::string> paths, ARDOUR::SourceList& sources, framepos_t& pos, Editing::ImportMode,
			 int target_regions, int target_tracks, boost::shared_ptr<ARDOUR::Track>&, bool add_channel_suffix);
	int finish_bringing_in_material (boost::shared_ptr<ARDOUR::Region> region, uint32_t, uint32_t,  framepos_t& pos, Editing::ImportMode mode,
				      boost::shared_ptr<ARDOUR::Track>& existing_track);

	boost::shared_ptr<ARDOUR::AudioTrack> get_nth_selected_audio_track (int nth) const;
	boost::shared_ptr<ARDOUR::MidiTrack> get_nth_selected_midi_track (int nth) const;

	ARDOUR::InterThreadInfo* current_interthread_info;

	AnalysisWindow* analysis_window;

	/* import specific info */

	struct EditorImportStatus : public ARDOUR::ImportStatus {
	    Editing::ImportMode mode;
	    framepos_t pos;
	    int target_tracks;
	    int target_regions;
	    boost::shared_ptr<ARDOUR::Track> track;
	    bool replace;
	};

	EditorImportStatus import_status;
	static void *_import_thread (void *);
	void* import_thread ();
	void finish_import ();

	/* to support this ... */

	void import_audio (bool as_tracks);
	void do_import (std::vector<std::string> paths, bool split, bool as_tracks);

	void move_to_start ();
	void move_to_end ();
	void center_playhead ();
	void center_edit_point ();
	void playhead_forward_to_grid ();
	void playhead_backward_to_grid ();
	void scroll_playhead (bool forward);
	void scroll_backward (float pages=0.8f);
	void scroll_forward (float pages=0.8f);
	void scroll_tracks_down ();
	void scroll_tracks_up ();
	void set_mark ();
	void clear_markers ();
	void clear_ranges ();
	void clear_locations ();
	void unhide_markers ();
	void unhide_ranges ();
	void jump_forward_to_mark ();
	void jump_backward_to_mark ();
	void cursor_align (bool playhead_to_edit);

	void remove_last_capture ();
	void select_all_selectables_using_time_selection ();
	void select_all_selectables_using_loop();
	void select_all_selectables_using_punch();
	void set_selection_from_range (ARDOUR::Location&);
	void set_selection_from_punch ();
	void set_selection_from_loop ();
	void set_selection_from_region ();

	void add_location_mark (framepos_t where);
	void add_location_from_region ();
	void add_locations_from_region ();
	void add_location_from_selection ();
	void set_loop_from_selection (bool play);
	void set_punch_from_selection ();
	void set_punch_from_region ();

	void set_loop_from_edit_range (bool play);
	void set_loop_from_region (bool play);
	void set_punch_from_edit_range ();

	void set_loop_range (framepos_t start, framepos_t end, std::string cmd);
	void set_punch_range (framepos_t start, framepos_t end, std::string cmd);

	void add_location_from_playhead_cursor ();
	bool select_new_marker;

	void reverse_selection ();
	void edit_envelope ();

	double last_scrub_x;
	int scrubbing_direction;
	int scrub_reversals;
	int scrub_reverse_distance;
	void scrub (framepos_t, double);

	void keyboard_selection_begin ();
	void keyboard_selection_finish (bool add);
	bool have_pending_keyboard_selection;
	framepos_t pending_keyboard_selection_start;

	void move_range_selection_start_or_end_to_region_boundary (bool, bool);

	Editing::SnapType _snap_type;
	Editing::SnapMode _snap_mode;

	/// Snap threshold in pixels
	double snap_threshold;

	bool ignore_gui_changes;

	DragManager* _drags;

	void escape ();

	Gtk::Menu fade_context_menu;
	void popup_fade_context_menu (int, int, ArdourCanvas::Item*, ItemType);

	void set_fade_in_shape (ARDOUR::FadeShape);
	void set_fade_out_shape (ARDOUR::FadeShape);

	void set_fade_length (bool in);
	void set_fade_in_active (bool);
	void set_fade_out_active (bool);

	std::set<boost::shared_ptr<ARDOUR::Playlist> > motion_frozen_playlists;

	bool _dragging_playhead;
	bool _dragging_edit_point;

	void marker_drag_motion_callback (GdkEvent*);
	void marker_drag_finished_callback (GdkEvent*);

	gint mouse_rename_region (ArdourCanvas::Item*, GdkEvent*);

	void add_region_drag (ArdourCanvas::Item*, GdkEvent*, RegionView*);
	void start_create_region_grab (ArdourCanvas::Item*, GdkEvent*);
	void add_region_copy_drag (ArdourCanvas::Item*, GdkEvent*, RegionView*);
	void add_region_brush_drag (ArdourCanvas::Item*, GdkEvent*, RegionView*);
	void start_selection_grab (ArdourCanvas::Item*, GdkEvent*);

	void region_view_item_click (AudioRegionView&, GdkEventButton*);

	bool can_remove_control_point (ArdourCanvas::Item *);
	void remove_control_point (ArdourCanvas::Item *);

	void mouse_brush_insert_region (RegionView*, framepos_t pos);

	/* Canvas event handlers */

	bool canvas_control_point_event (GdkEvent* event,ArdourCanvas::Item*, ControlPoint*);
	bool canvas_line_event (GdkEvent* event,ArdourCanvas::Item*, AutomationLine*);
	bool canvas_selection_rect_event (GdkEvent* event,ArdourCanvas::Item*, SelectionRect*);
	bool canvas_selection_start_trim_event (GdkEvent* event,ArdourCanvas::Item*, SelectionRect*);
	bool canvas_selection_end_trim_event (GdkEvent* event,ArdourCanvas::Item*, SelectionRect*);
	bool canvas_crossfade_view_event (GdkEvent* event,ArdourCanvas::Item*, CrossfadeView*);
	bool canvas_fade_in_event (GdkEvent* event,ArdourCanvas::Item*, AudioRegionView*);
	bool canvas_fade_in_handle_event (GdkEvent* event,ArdourCanvas::Item*, AudioRegionView*);
	bool canvas_fade_out_event (GdkEvent* event,ArdourCanvas::Item*, AudioRegionView*);
	bool canvas_fade_out_handle_event (GdkEvent* event,ArdourCanvas::Item*, AudioRegionView*);
	bool canvas_region_view_event (GdkEvent* event,ArdourCanvas::Item*, RegionView*);
	bool canvas_frame_handle_event (GdkEvent* event,ArdourCanvas::Item*, RegionView*);
	bool canvas_region_view_name_highlight_event (GdkEvent* event,ArdourCanvas::Item*, RegionView*);
	bool canvas_region_view_name_event (GdkEvent* event,ArdourCanvas::Item*, RegionView*);
	bool canvas_feature_line_event (GdkEvent* event, ArdourCanvas::Item*, RegionView*);
	bool canvas_stream_view_event (GdkEvent* event,ArdourCanvas::Item*, RouteTimeAxisView*);
	bool canvas_marker_event (GdkEvent* event,ArdourCanvas::Item*, Marker*);
	bool canvas_zoom_rect_event (GdkEvent* event,ArdourCanvas::Item*);
	bool canvas_tempo_marker_event (GdkEvent* event,ArdourCanvas::Item*, TempoMarker*);
	bool canvas_meter_marker_event (GdkEvent* event,ArdourCanvas::Item*, MeterMarker*);
	bool canvas_automation_track_event(GdkEvent* event, ArdourCanvas::Item*, AutomationTimeAxisView*) ;
	bool canvas_note_event (GdkEvent* event, ArdourCanvas::Item*);

	bool canvas_tempo_bar_event (GdkEvent* event, ArdourCanvas::Item*);
	bool canvas_meter_bar_event (GdkEvent* event, ArdourCanvas::Item*);
	bool canvas_marker_bar_event (GdkEvent* event, ArdourCanvas::Item*);
	bool canvas_range_marker_bar_event (GdkEvent* event, ArdourCanvas::Item*);
	bool canvas_transport_marker_bar_event (GdkEvent* event, ArdourCanvas::Item*);
	bool canvas_cd_marker_bar_event (GdkEvent* event, ArdourCanvas::Item*);

	bool canvas_imageframe_item_view_event(GdkEvent* event, ArdourCanvas::Item*,ImageFrameView*);
	bool canvas_imageframe_view_event(GdkEvent* event, ArdourCanvas::Item*,ImageFrameTimeAxis*);
	bool canvas_imageframe_start_handle_event(GdkEvent* event, ArdourCanvas::Item*,ImageFrameView*);
	bool canvas_imageframe_end_handle_event(GdkEvent* event, ArdourCanvas::Item*,ImageFrameView*);
	bool canvas_marker_time_axis_view_event(GdkEvent* event, ArdourCanvas::Item*,MarkerTimeAxis*);
	bool canvas_markerview_item_view_event(GdkEvent* event, ArdourCanvas::Item*,MarkerView*);
	bool canvas_markerview_start_handle_event(GdkEvent* event, ArdourCanvas::Item*,MarkerView*);
	bool canvas_markerview_end_handle_event(GdkEvent* event, ArdourCanvas::Item*,MarkerView*);

	PBD::Signal0<void> EditorFreeze;
	PBD::Signal0<void> EditorThaw;

  private:
	friend class DragManager;
	friend class EditorRouteGroups;
	friend class EditorRegions;

	/** true if the mouse is over a place where region trim can happen */
	bool _over_region_trim_target;

	/* non-public event handlers */

	bool canvas_playhead_cursor_event (GdkEvent* event, ArdourCanvas::Item*);
	bool track_canvas_scroll (GdkEventScroll* event);

	bool track_canvas_scroll_event (GdkEventScroll* event);
	bool track_canvas_button_press_event (GdkEventButton* event);
	bool track_canvas_button_release_event (GdkEventButton* event);
	bool track_canvas_motion_notify_event (GdkEventMotion* event);

	Gtk::Allocation canvas_allocation;
	void track_canvas_allocate (Gtk::Allocation alloc);
	bool track_canvas_size_allocated ();
	bool track_canvas_drag_motion (Glib::RefPtr<Gdk::DragContext> const &, int, int, guint);
	bool track_canvas_key_press (GdkEventKey *);
	bool track_canvas_key_release (GdkEventKey *);

	void set_playhead_cursor ();

	void toggle_region_mute ();

	void initialize_canvas ();

	/* display control */

	bool _show_measures;
	/// true if the editor should follow the playhead, otherwise false
	bool _follow_playhead;
	/// true if we scroll the tracks rather than the playhead
	bool _stationary_playhead;
	/// true if we are in fullscreen mode
	bool _maximised;

	ARDOUR::TempoMap::BBTPointList::const_iterator current_bbt_points_begin;
	ARDOUR::TempoMap::BBTPointList::const_iterator current_bbt_points_end;

	TempoLines* tempo_lines;

	ArdourCanvas::Group* time_line_group;

	void hide_measures ();
	void draw_measures ();
	bool redraw_measures ();

	void new_tempo_section ();

	void mouse_add_new_tempo_event (framepos_t where);
	void mouse_add_new_meter_event (framepos_t where);

	void remove_tempo_marker (ArdourCanvas::Item*);
	void remove_meter_marker (ArdourCanvas::Item*);
	gint real_remove_tempo_marker (ARDOUR::TempoSection*);
	gint real_remove_meter_marker (ARDOUR::MeterSection*);

	void edit_tempo_section (ARDOUR::TempoSection*);
	void edit_meter_section (ARDOUR::MeterSection*);
	void edit_tempo_marker (ArdourCanvas::Item*);
	void edit_meter_marker (ArdourCanvas::Item*);
	void edit_control_point (ArdourCanvas::Item*);
	void edit_note (ArdourCanvas::Item *);

	void marker_menu_edit ();
	void marker_menu_remove ();
	void marker_menu_rename ();
	void toggle_marker_menu_lock ();
	void toggle_marker_menu_glue ();
	void marker_menu_hide ();
	void marker_menu_loop_range ();
	void marker_menu_select_all_selectables_using_range ();
	void marker_menu_select_using_range ();
	void marker_menu_separate_regions_using_location ();
	void marker_menu_play_from ();
	void marker_menu_play_range ();
	void marker_menu_set_playhead ();
	void marker_menu_set_from_playhead ();
	void marker_menu_set_from_selection ();
	void marker_menu_range_to_next ();
	void new_transport_marker_menu_set_loop ();
	void new_transport_marker_menu_set_punch ();
	void update_loop_range_view (bool visibility=false);
	void update_punch_range_view (bool visibility=false);
	void new_transport_marker_menu_popdown ();
	void marker_context_menu (GdkEventButton*, ArdourCanvas::Item*);
	void tempo_or_meter_marker_context_menu (GdkEventButton*, ArdourCanvas::Item*);
	void new_transport_marker_context_menu (GdkEventButton*, ArdourCanvas::Item*);
	void build_range_marker_menu (bool, bool);
	void build_marker_menu (ARDOUR::Location *);
	void build_tempo_or_meter_marker_menu (bool);
	void build_new_transport_marker_menu ();
	void dynamic_cast_marker_object (void*, MeterMarker**, TempoMarker**) const;

	Gtk::Menu* tempo_or_meter_marker_menu;
	Gtk::Menu* marker_menu;
	Gtk::Menu* range_marker_menu;
	Gtk::Menu* transport_marker_menu;
	Gtk::Menu* new_transport_marker_menu;
	Gtk::Menu* cd_marker_menu;
	ArdourCanvas::Item* marker_menu_item;

	typedef std::list<Marker*> Marks;
	Marks metric_marks;

	void remove_metric_marks ();
	void draw_metric_marks (const ARDOUR::Metrics& metrics);

	void compute_current_bbt_points (framepos_t left, framepos_t right);
	void tempo_map_changed (const PBD::PropertyChange&);
	void redisplay_tempo (bool immediate_redraw);

	uint32_t bbt_beat_subdivision;

	/* toolbar */

	Gtk::ToggleButton editor_mixer_button;
	Gtk::ToggleButton editor_list_button;
	void editor_mixer_button_toggled ();
	void editor_list_button_toggled ();

	AudioClock*               zoom_range_clock;
	ArdourButton              zoom_in_button;
	ArdourButton              zoom_out_button;
	ArdourButton              zoom_out_full_button;

	Gtk::Button              tav_expand_button;
	Gtk::Button              tav_shrink_button;

	Gtk::VBox                toolbar_clock_vbox;
	Gtk::VBox                toolbar_selection_clock_vbox;
	Gtk::Table               toolbar_selection_clock_table;
	Gtk::Label               toolbar_selection_cursor_label;

	Gtkmm2ext::TearOff*      _mouse_mode_tearoff;
	ArdourButton mouse_select_button;
	ArdourButton mouse_draw_button;
	ArdourButton mouse_move_button;
	ArdourButton mouse_gain_button;
	ArdourButton mouse_zoom_button;
	ArdourButton mouse_timefx_button;
	ArdourButton mouse_audition_button;

	ButtonJoiner* smart_mode_joiner;
	Glib::RefPtr<Gtk::ToggleAction> smart_mode_action;

	void                     mouse_mode_toggled (Editing::MouseMode m);
	void			 mouse_mode_object_range_toggled () {}
	bool                     ignore_mouse_mode_toggle;

	ArdourButton internal_edit_button;
	void         toggle_internal_editing ();

	bool                     mouse_select_button_release (GdkEventButton*);

	Gtk::VBox                automation_box;
	Gtk::Button              automation_mode_button;

	Gtk::ComboBoxText edit_mode_selector;
	Gtk::VBox         edit_mode_box;
	std::vector<std::string> edit_mode_strings;

	void set_edit_mode (ARDOUR::EditMode);
	void cycle_edit_mode ();
	void edit_mode_selection_done ();

	Gtk::ComboBoxText snap_type_selector;
	Gtk::ComboBoxText snap_mode_selector;
	Gtk::HBox         snap_box;

	std::vector<std::string> snap_type_strings;
	std::vector<std::string> snap_mode_strings;

	void snap_type_selection_done ();
	void snap_mode_selection_done ();
	void snap_mode_chosen (Editing::SnapMode);
	void snap_type_chosen (Editing::SnapType);

	Glib::RefPtr<Gtk::RadioAction> snap_type_action (Editing::SnapType);
	Glib::RefPtr<Gtk::RadioAction> snap_mode_action (Editing::SnapMode);

	Gtk::ComboBoxText zoom_focus_selector;
	Gtk::VBox         zoom_focus_box;

	std::vector<std::string> zoom_focus_strings;

	void zoom_focus_selection_done ();
	void zoom_focus_chosen (Editing::ZoomFocus);

	Glib::RefPtr<Gtk::RadioAction> zoom_focus_action (Editing::ZoomFocus);

	Gtk::HBox           _zoom_box;
	Gtkmm2ext::TearOff* _zoom_tearoff;
	void                zoom_adjustment_changed();

	void setup_toolbar ();

	void setup_tooltips ();

	Gtkmm2ext::TearOff*     _tools_tearoff;
	Gtk::HBox                toolbar_hbox;
	Gtk::EventBox            toolbar_base;
	Gtk::Frame               toolbar_frame;
	Gtk::Viewport           _toolbar_viewport;

	/* midi toolbar */

	Gtk::HBox                panic_box;

	void setup_midi_toolbar ();

	/* selection process */

	Selection* selection;
	Selection* cut_buffer;

	void time_selection_changed ();
	void track_selection_changed ();
	void region_selection_changed ();
	sigc::connection editor_regions_selection_changed_connection;
	void sensitize_all_region_actions (bool);
	void sensitize_the_right_region_actions ();
	bool _all_region_actions_sensitized;
	/** Flag to block region action handlers from doing what they normally do;
	 *  I tried Gtk::Action::block_activate() but this doesn't work (ie it doesn't
	 *  block) when setting a ToggleAction's active state.
	 */
	bool _ignore_region_action;
	bool _last_region_menu_was_main;
	void point_selection_changed ();
	void marker_selection_changed ();

	void cancel_selection ();

	bool audio_region_selection_covers (framepos_t where);

	/* transport range select process */

	ArdourCanvas::SimpleRect*  cd_marker_bar_drag_rect;
	ArdourCanvas::SimpleRect*  range_bar_drag_rect;
	ArdourCanvas::SimpleRect*  transport_bar_drag_rect;

#ifdef GTKOSX
	ArdourCanvas::SimpleRect     *bogus_background_rect;
#endif
	ArdourCanvas::SimpleRect     *transport_bar_range_rect;
	ArdourCanvas::SimpleRect     *transport_bar_preroll_rect;
	ArdourCanvas::SimpleRect     *transport_bar_postroll_rect;
	ArdourCanvas::SimpleRect     *transport_loop_range_rect;
	ArdourCanvas::SimpleRect     *transport_punch_range_rect;
	ArdourCanvas::SimpleLine     *transport_punchin_line;
	ArdourCanvas::SimpleLine     *transport_punchout_line;
	ArdourCanvas::SimpleRect     *transport_preroll_rect;
	ArdourCanvas::SimpleRect     *transport_postroll_rect;

	ARDOUR::Location*  transport_loop_location();
	ARDOUR::Location*  transport_punch_location();

	ARDOUR::Location   *temp_location;

	/* object rubberband select process */

	void select_all_within (framepos_t, framepos_t, double, double, TrackViewList const &, Selection::Operation, bool);

	ArdourCanvas::SimpleRect   *rubberband_rect;

	/* mouse zoom process */

	ArdourCanvas::SimpleRect   *zoom_rect;
	void reposition_zoom_rect (framepos_t start, framepos_t end);

	EditorRouteGroups* _route_groups;
	EditorRoutes* _routes;
	EditorRegions* _regions;
	EditorSnapshots* _snapshots;
	EditorLocations* _locations;

	/* diskstream/route display management */
	Glib::RefPtr<Gdk::Pixbuf> rec_enabled_icon;
	Glib::RefPtr<Gdk::Pixbuf> rec_disabled_icon;

	Glib::RefPtr<Gtk::TreeSelection> route_display_selection;

	bool sync_track_view_list_and_routes ();

	Gtk::VBox           list_vpacker;

	/* autoscrolling */

	bool autoscroll_active;
	int autoscroll_timeout_tag;
	int autoscroll_x;
	int autoscroll_y;
	int last_autoscroll_x;
	int last_autoscroll_y;
	uint32_t autoscroll_cnt;
	framecnt_t autoscroll_x_distance;
	double autoscroll_y_distance;

	bool _autoscroll_fudging;
	int autoscroll_fudge_threshold () const;

	static gint _autoscroll_canvas (void *);
	bool autoscroll_canvas ();
	void start_canvas_autoscroll (int x, int y);
	void stop_canvas_autoscroll ();

	/* trimming */
	void point_trim (GdkEvent *, framepos_t);

	void trim_region_front();
	void trim_region_back();
	void trim_region (bool front);

	void trim_region_to_loop ();
	void trim_region_to_punch ();
	void trim_region_to_location (const ARDOUR::Location&, const char* cmd);

	void trim_to_region(bool forward);
	void trim_region_to_previous_region_end();
	void trim_region_to_next_region_start();

	bool show_gain_after_trim;

	/* Drag-n-Drop */

	int convert_drop_to_paths (
                std::vector<std::string>&           paths,
                const Glib::RefPtr<Gdk::DragContext>& context,
                gint                                  x,
                gint                                  y,
                const Gtk::SelectionData&             data,
                guint                                 info,
                guint                                 time);

	void track_canvas_drag_data_received (
                const Glib::RefPtr<Gdk::DragContext>& context,
                gint                                  x,
                gint                                  y,
                const Gtk::SelectionData&             data,
                guint                                 info,
                guint                                 time);

	void drop_paths (
                const Glib::RefPtr<Gdk::DragContext>& context,
                gint                                  x,
                gint                                  y,
                const Gtk::SelectionData&             data,
                guint                                 info,
                guint                                 time);

	void drop_regions (
                const Glib::RefPtr<Gdk::DragContext>& context,
                gint                                  x,
                gint                                  y,
                const Gtk::SelectionData&             data,
                guint                                 info,
                guint                                 time);

	void drop_routes (
                const Glib::RefPtr<Gdk::DragContext>& context,
                gint                x,
                gint                y,
                const Gtk::SelectionData& data,
                guint               info,
                guint               time);

	/* audio export */

	int  write_region_selection(RegionSelection&);
	bool write_region (std::string path, boost::shared_ptr<ARDOUR::AudioRegion>);
	void bounce_region_selection (bool with_processing);
	void bounce_range_selection (bool replace, bool enable_processing);
	void external_edit_region ();

	int write_audio_selection (TimeSelection&);
	bool write_audio_range (ARDOUR::AudioPlaylist&, const ARDOUR::ChanCount& channels, std::list<ARDOUR::AudioRange>&);

	void write_selection ();

	XMLNode *before; /* used in *_reversible_command */

	void update_title ();
	void update_title_s (const std::string & snapshot_name);

	void instant_save ();

	boost::shared_ptr<ARDOUR::AudioRegion> last_audition_region;

	/* freeze operations */

	ARDOUR::InterThreadInfo freeze_status;
	static void* _freeze_thread (void*);
	void* freeze_thread ();

	void freeze_route ();
	void unfreeze_route ();

	/* duplication */

	void duplicate_dialog (bool with_dialog);

	framepos_t event_frame (GdkEvent const *, double* px = 0, double* py = 0) const;

	/* returns false if mouse pointer is not in track or marker canvas
	 */
	bool mouse_frame (framepos_t&, bool& in_track_canvas) const;

	TimeFXDialog* current_timefx;
	static void* timefx_thread (void *arg);
	void do_timefx ();

	int time_stretch (RegionSelection&, float fraction);
	int pitch_shift (RegionSelection&, float cents);
	void pitch_shift_region ();

	void transpose_region ();

	/* editor-mixer strip */

	MixerStrip *current_mixer_strip;
	bool show_editor_mixer_when_tracks_arrive;
	Gtk::VBox current_mixer_strip_vbox;
	void cms_new (boost::shared_ptr<ARDOUR::Route>);
	void current_mixer_strip_hidden ();

	void detach_tearoff (Gtk::Box* b, Gtk::Window* w);
	void reattach_tearoff (Gtk::Box* b, Gtk::Window* w, int32_t n);
#ifdef GTKOSX
	void ensure_all_elements_drawn ();
#endif
	/* nudging tracks */

	void nudge_track (bool use_edit_point, bool forwards);

	/* xfades */

	bool _xfade_visibility;

#ifdef WITH_CMT
	void handle_new_imageframe_time_axis_view(const std::string & track_name, void* src) ;
	void handle_new_imageframe_marker_time_axis_view(const std::string & track_name, TimeAxisView* marked_track) ;

	void start_imageframe_grab(ArdourCanvas::Item*, GdkEvent*) ;
	void start_markerview_grab(ArdourCanvas::Item*, GdkEvent*) ;

	void imageframe_drag_motion_callback(ArdourCanvas::Item*, GdkEvent*) ;
	void markerview_drag_motion_callback(ArdourCanvas::Item*, GdkEvent*) ;
	void timeaxis_item_drag_finished_callback(ArdourCanvas::Item*, GdkEvent*) ;

	gint canvas_imageframe_item_view_event(ArdourCanvas::Item* item, GdkEvent* event, ImageFrameView* ifv);
	gint canvas_imageframe_view_event(ArdourCanvas::Item* item, GdkEvent* event, ImageFrameTimeAxis* ifta);
	gint canvas_imageframe_start_handle_event(ArdourCanvas::Item* item, GdkEvent* event, ImageFrameView* ifv);
	gint canvas_imageframe_end_handle_event(ArdourCanvas::Item* item, GdkEvent* event, ImageFrameView* ifv);

	gint canvas_marker_time_axis_view_event(ArdourCanvas::Item* item, GdkEvent* event, MarkerTimeAxis* mta);
	gint canvas_markerview_item_view_event(ArdourCanvas::Item* item, GdkEvent* event, MarkerView* mv);
	gint canvas_markerview_start_handle_event(ArdourCanvas::Item* item, GdkEvent* event, MarkerView* mv);
	gint canvas_markerview_end_handle_event(ArdourCanvas::Item* item, GdkEvent* event, MarkerView* mv);

	void imageframe_start_handle_op(ArdourCanvas::Item* item, GdkEvent* event) ;
	void imageframe_end_handle_op(ArdourCanvas::Item* item, GdkEvent* event) ;
	void imageframe_start_handle_trim_motion(ArdourCanvas::Item* item, GdkEvent* event) ;
	void imageframe_start_handle_end_trim(ArdourCanvas::Item* item, GdkEvent* event) ;
	void imageframe_end_handle_trim_motion(ArdourCanvas::Item* item, GdkEvent* event) ;
	void imageframe_end_handle_end_trim(ArdourCanvas::Item* item, GdkEvent* event) ;

	void markerview_item_start_handle_op(ArdourCanvas::Item* item, GdkEvent* event) ;
	void markerview_item_end_handle_op(ArdourCanvas::Item* item, GdkEvent* event) ;
	void markerview_start_handle_trim_motion(ArdourCanvas::Item* item, GdkEvent* event) ;
	void markerview_start_handle_end_trim(ArdourCanvas::Item* item, GdkEvent* event) ;
	void markerview_end_handle_trim_motion(ArdourCanvas::Item* item, GdkEvent* event) ;
	void markerview_end_handle_end_trim(ArdourCanvas::Item* item, GdkEvent* event) ;

	void popup_imageframe_edit_menu(int button, int32_t time, ArdourCanvas::Item* ifv, bool with_frame) ;
	void popup_marker_time_axis_edit_menu(int button, int32_t time, ArdourCanvas::Item* ifv, bool with_frame) ;

	ImageFrameSocketHandler* image_socket_listener ;
#endif

	void toggle_xfade_active (RouteTimeAxisView *, boost::weak_ptr<ARDOUR::Crossfade>);
	void toggle_xfade_length (RouteTimeAxisView *, boost::weak_ptr<ARDOUR::Crossfade>);
	void edit_xfade (boost::weak_ptr<ARDOUR::Crossfade>);
	void xfade_edit_left_region ();
	void xfade_edit_right_region ();

	static const int32_t default_width = 995;
	static const int32_t default_height = 765;

	/* nudge */

	Gtk::Button      nudge_forward_button;
	Gtk::Button      nudge_backward_button;
	Gtk::HBox        nudge_hbox;
	Gtk::VBox        nudge_vbox;
	AudioClock*       nudge_clock;

	bool nudge_forward_release (GdkEventButton*);
	bool nudge_backward_release (GdkEventButton*);

	/* audio filters */

	void apply_filter (ARDOUR::Filter&, std::string cmd, ProgressReporter* progress = 0);

	Command* apply_midi_note_edit_op_to_region (ARDOUR::MidiOperator& op, MidiRegionView& mrv);
	void apply_midi_note_edit_op (ARDOUR::MidiOperator& op);

	/* handling cleanup */

	int playlist_deletion_dialog (boost::shared_ptr<ARDOUR::Playlist>);

	PBD::ScopedConnectionList session_connections;

	/* tracking step changes of track height */

	TimeAxisView* current_stepping_trackview;
	ARDOUR::microseconds_t last_track_height_step_timestamp;
	gint track_height_step_timeout();
	sigc::connection step_timeout;

	TimeAxisView* entered_track;
	/** If the mouse is over a RegionView or one of its child canvas items, this is set up
	    to point to the RegionView.  Otherwise it is 0.
	*/
	RegionView*   entered_regionview;


	void ensure_entered_track_selected (bool op_acts_on_objects = false);
	bool clear_entered_track;
	bool left_track_canvas (GdkEventCrossing*);
	bool entered_track_canvas (GdkEventCrossing*);
	void set_entered_track (TimeAxisView*);
	void set_entered_regionview (RegionView*);
	void ensure_track_visible (TimeAxisView*);
	gint left_automation_track ();

	void reset_canvas_action_sensitivity (bool);
	void set_gain_envelope_visibility (bool);
	void set_region_gain_visibility (RegionView*, bool);
	void toggle_gain_envelope_active ();
	void reset_region_gain_envelopes ();

	bool on_key_press_event (GdkEventKey*);
	bool on_key_release_event (GdkEventKey*);

	void session_state_saved (std::string);

	Glib::RefPtr<Gtk::Action>              undo_action;
	Glib::RefPtr<Gtk::Action>              redo_action;

	void history_changed ();

	Gtk::HBox      status_bar_hpacker;

	Editing::EditPoint _edit_point;

	Gtk::ComboBoxText edit_point_selector;

	void set_edit_point_preference (Editing::EditPoint ep, bool force = false);
	void cycle_edit_point (bool with_marker);
	void set_edit_point ();
	void edit_point_selection_done ();
	void edit_point_chosen (Editing::EditPoint);
	Glib::RefPtr<Gtk::RadioAction> edit_point_action (Editing::EditPoint);
	std::vector<std::string> edit_point_strings;

	void selected_marker_moved (ARDOUR::Location*);

	bool get_edit_op_range (framepos_t& start, framepos_t& end) const;

	void get_regions_at (RegionSelection&, framepos_t where, const TrackViewList& ts) const;
	void get_regions_after (RegionSelection&, framepos_t where, const TrackViewList& ts) const;

	RegionSelection get_regions_from_selection ();
	RegionSelection get_regions_from_selection_and_edit_point ();
	RegionSelection get_regions_from_selection_and_entered ();

	void start_updating_meters ();
	void stop_updating_meters ();
	bool meters_running;

	void select_next_route ();
	void select_prev_route ();

	void snap_to_internal (framepos_t& first, int32_t direction = 0, bool for_mark = false);
	void timecode_snap_to_internal (framepos_t& first, int32_t direction = 0, bool for_mark = false);

	RhythmFerret* rhythm_ferret;

	void fit_tracks (TrackViewList &);
	void fit_selected_tracks ();
	void set_track_height (Height);

	void remove_tracks ();
	void toggle_tracks_active ();

	bool _have_idled;
	int resize_idle_id;
	static gboolean _idle_resize (gpointer);
	bool idle_resize();
	int32_t _pending_resize_amount;
	TimeAxisView* _pending_resize_view;

	void visible_order_range (int*, int*) const;

	void located ();

	/** true if we've made a locate request that hasn't yet been processed */
	bool _pending_locate_request;

	/** if true, there is a pending Session locate which is the initial one when loading a session;
	    we need to know this so that we don't (necessarily) set the viewport to show the playhead
	    initially.
	*/
	bool _pending_initial_locate;

	Gtk::HBox _summary_hbox;
	EditorSummary* _summary;

	void region_view_added (RegionView *);
	void region_view_removed ();

	void update_canvas_now ();

	EditorGroupTabs* _group_tabs;
	void fit_route_group (ARDOUR::RouteGroup *);

	void step_edit_status_change (bool);
	void start_step_editing ();
	void stop_step_editing ();
	bool check_step_edit ();
	sigc::connection step_edit_connection;

	double _last_motion_y;

	RegionLayeringOrderEditor* layering_order_editor;
	void update_region_layering_order_editor ();

	/** Track that was the source for the last cut/copy operation.  Used as a place
	    to paste things iff there is no selected track.
	*/
	TimeAxisView* _last_cut_copy_source_track;

	/** true if a change in Selection->regions should change the selection in the region list.
	    See EditorRegions::selection_changed.
	*/
	bool _region_selection_change_updates_region_list;

	void setup_fade_images ();
	std::map<ARDOUR::FadeShape, Gtk::Image*> _fade_in_images;
	std::map<ARDOUR::FadeShape, Gtk::Image*> _fade_out_images;

	Gtk::MenuItem& action_menu_item (std::string const &);
	void action_pre_activated (Glib::RefPtr<Gtk::Action> const &);

	void set_canvas_cursor_for_region_view (double, RegionView *);

	MouseCursors* _cursors;

	void follow_mixer_selection ();
	bool _following_mixer_selection;

	int time_fx (ARDOUR::RegionList&, float val, bool pitching);

	bool doing_range_stuff() const {
		return (mouse_mode == Editing::MouseRange && (_join_object_range_state == JOIN_OBJECT_RANGE_NONE)) ||
			_join_object_range_state == JOIN_OBJECT_RANGE_RANGE;
	}
	
	bool doing_object_stuff() const {
		return (mouse_mode == Editing::MouseObject && (_join_object_range_state == JOIN_OBJECT_RANGE_NONE)) ||
			_join_object_range_state == JOIN_OBJECT_RANGE_OBJECT;
	}

	void toggle_sound_midi_notes ();

	friend class Drag;
	friend class RegionDrag;
	friend class RegionMoveDrag;
	friend class RegionSpliceDrag;
	friend class TrimDrag;
	friend class MeterMarkerDrag;
	friend class TempoMarkerDrag;
	friend class CursorDrag;
	friend class FadeInDrag;
	friend class FadeOutDrag;
	friend class MarkerDrag;
	friend class RegionGainDrag;
	friend class ControlPointDrag;
	friend class LineDrag;
	friend class RubberbandSelectDrag;
	friend class EditorRubberbandSelectDrag;
	friend class TimeFXDrag;
	friend class ScrubDrag;
	friend class SelectionDrag;
	friend class RangeMarkerBarDrag;
	friend class MouseZoomDrag;
	friend class RegionCreateDrag;
	friend class RegionMotionDrag;
	friend class RegionInsertDrag;

	friend class EditorSummary;
	friend class EditorGroupTabs;

	friend class EditorRoutes;
	friend class RhythmFerret;
};

#endif /* __ardour_editor_h__ */