editor.h

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/*
 * Copyright (C) 2005-2006 Taybin Rutkin <taybin@taybin.com>
 * Copyright (C) 2005-2007 Doug McLain <doug@nostar.net>
 * Copyright (C) 2005-2018 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2005 Karsten Wiese <fzuuzf@googlemail.com>
 * Copyright (C) 2006-2009 Sampo Savolainen <v2@iki.fi>
 * Copyright (C) 2006-2015 David Robillard <d@drobilla.net>
 * Copyright (C) 2006-2017 Tim Mayberry <mojofunk@gmail.com>
 * Copyright (C) 2007-2012 Carl Hetherington <carl@carlh.net>
 * Copyright (C) 2008-2011 Sakari Bergen <sakari.bergen@beatwaves.net>
 * Copyright (C) 2008 Hans Baier <hansfbaier@googlemail.com>
 * Copyright (C) 2013-2015 Colin Fletcher <colin.m.fletcher@googlemail.com>
 * Copyright (C) 2013-2019 Robin Gareus <robin@gareus.org>
 * Copyright (C) 2014-2017 Nick Mainsbridge <mainsbridge@gmail.com>
 * Copyright (C) 2014-2019 Ben Loftis <ben@harrisonconsoles.com>
 * Copyright (C) 2015-2019 Damien Zammit <damien@zamaudio.com>
 * Copyright (C) 2015 André Nusser <andre.nusser@googlemail.com>
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#pragma once
 
#include <sys/time.h>
 
#include <cmath>
#include <list>
#include <map>
#include <set>
#include <string>
#include <vector>
 
#include <optional>
 
#include <ytkmm/comboboxtext.h>
#include <ytkmm/layout.h>
 
#include "gtkmm2ext/bindings.h"
#include "gtkmm2ext/dndtreeview.h"
 
#include "pbd/controllable.h"
#include "pbd/signals.h"
 
#include "ardour/import_status.h"
#include "ardour/tempo.h"
#include "ardour/location.h"
#include "ardour/types.h"
 
#include "canvas/fwd.h"
#include "canvas/ruler.h"
 
#include "widgets/ardour_button.h"
#include "widgets/ardour_dropdown.h"
#include "widgets/ardour_spacer.h"
#include "widgets/metabutton.h"
#include "widgets/pane.h"
 
#include "application_bar.h"
#include "ardour_dialog.h"
#include "public_editor.h"
#include "editing.h"
#include "enums.h"
#include "editor_items.h"
#include "region_selection.h"
#include "selection_memento.h"
#include "trigger_clip_picker.h"
#include "tempo_curve.h"
 
#include "ptformat/ptformat.h"
 
namespace Gtkmm2ext {
        class Bindings;
}
 
namespace Evoral {
        class SMF;
}
 
namespace ARDOUR {
        class AudioPlaylist;
        class AudioRegion;
        class AudioTrack;
        class ChanCount;
        class Filter;
        class Location;
        class MidiOperator;
        class MidiRegion;
        class MidiTrack;
        class Playlist;
        class Region;
        class RouteGroup;
        class Session;
        class Track;
}
 
class AnalysisWindow;
class AudioClock;
class AudioRegionView;
class AudioStreamView;
class AudioTimeAxisView;
class EditorAutomationLine;
class AutomationSelection;
class AutomationTimeAxisView;
class BundleManager;
class ControlPoint;
class CursorContext;
class DragManager;
class EditNoteDialog;
class EditorCursor;
class EditorGroupTabs;
class EditorLocations;
class EditorRegions;
class EditorSections;
class EditorSources;
class EditorRoutes;
class EditorRouteGroups;
class EditorSnapshots;
class EditorSummary;
class GUIObjectState;
class ArdourMarker;
class MidiRegionView;
class MidiView;
class MidiExportDialog;
class MixerStrip;
class MouseCursors;
class NoteBase;
class Pianoroll;
class PluginSelector;
class ProgressReporter;
class QuantizeDialog;
class RegionPeakCursor;
class RhythmFerret;
class RulerDialog;
class SectionBox;
class Selection;
class SelectionPropertiesBox;
class SoundFileOmega;
class StreamView;
class GridLines;
class TimeAxisView;
class TimeInfoBox;
class TimeFXDialog;
class TimeSelection;
class RegionLayeringOrderEditor;
class VerboseCursor;
 
class Editor : public PublicEditor, public PBD::ScopedConnectionList
{
public:
        Editor ();
        ~Editor ();
 
        void             set_session (ARDOUR::Session*);
 
        Gtk::Window* use_own_window (bool and_fill_it);
 
        void             first_idle ();
        virtual bool     have_idled () const { return _have_idled; }
 
        bool pending_locate_request() const { return _pending_locate_request; }
 
        samplepos_t leftmost_sample() const { return _leftmost_sample; }
 
        samplecnt_t current_page_samples() const {
                return (samplecnt_t) _visible_canvas_width* samples_per_pixel;
        }
 
        double visible_canvas_height () const {
                return _visible_canvas_height;
        }
        double trackviews_height () const;
 
        XMLNode& get_state () const;
        int set_state (const XMLNode&, int version);
 
        void step_mouse_mode (bool next);
        bool internal_editing() const;
 
        void remove_midi_note (ArdourCanvas::Item*, GdkEvent*);
 
        void foreach_time_axis_view (sigc::slot<void,TimeAxisView&>);
        void add_to_idle_resize (TimeAxisView*, int32_t);
 
        StripableTimeAxisView* get_stripable_time_axis_by_id (const PBD::ID& id) const;
 
        void consider_auditioning (std::shared_ptr<ARDOUR::Region>);
        void hide_a_region (std::shared_ptr<ARDOUR::Region>);
        void show_a_region (std::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);
 
        /* selection */
 
        Selection& get_selection() const { return *selection; }
        bool get_selection_extents (Temporal::timepos_t &start, Temporal::timepos_t &end) const;  // the time extents of the current selection, whether Range, Region(s), Control Points, or Notes
        Selection& get_cut_buffer() const { return *cut_buffer; }
 
        std::list<SelectableOwner*> selectable_owners();
 
        void get_regionviews_at_or_after (Temporal::timepos_t const &, RegionSelection&);
 
        void set_selection (std::list<Selectable*>, ARDOUR::SelectionOperation);
 
        std::shared_ptr<ARDOUR::Route> current_mixer_stripable () const;
 
        bool extend_selection_to_track (TimeAxisView&);
 
        void edit_region_in_pianoroll_window ();
 
        void play_selection ();
        void maybe_locate_with_edit_preroll (samplepos_t);
        void play_with_preroll ();
        void rec_with_preroll ();
        void rec_with_count_in ();
        void select_all_in_track (ARDOUR::SelectionOperation op);
        void select_all_objects (ARDOUR::SelectionOperation op);
        void invert_selection_in_track ();
        void invert_selection ();
        void deselect_all ();
        long select_range (Temporal::timepos_t const & , Temporal::timepos_t const &);
 
        void set_selected_regionview_from_region_list (std::shared_ptr<ARDOUR::Region> region, ARDOUR::SelectionOperation op = ARDOUR::SelectionSet);
 
        void remove_tracks ();
 
        /* tempo */
 
        // void update_grid ();
 
        /* analysis window */
 
        void loudness_analyze_region_selection();
        void loudness_analyze_range_selection();
 
        void spectral_analyze_region_selection();
        void spectral_analyze_range_selection();
 
        /* export */
 
        void export_audio ();
        void stem_export ();
        void export_selection ();
        void export_range ();
        void export_region ();
        void quick_export ();
        void surround_export ();
 
        /* export for analysis only */
        void loudness_assistant (bool);
        void loudness_assistant_marker ();
        void measure_master_loudness (samplepos_t start, samplepos_t end, bool);
 
        bool process_midi_export_dialog (MidiExportDialog& dialog, std::shared_ptr<ARDOUR::MidiRegion> midi_region);
 
        void ensure_time_axis_view_is_visible (TimeAxisView const & tav, bool at_top);
        void tav_zoom_step (bool coarser);
        void tav_zoom_smooth (bool coarser, bool force_all);
 
        void                         cycle_marker_click_behavior ();
        void                         set_marker_click_behavior (Editing::MarkerClickBehavior);
        Editing::MarkerClickBehavior get_marker_click_behavior () const { return marker_click_behavior; }
 
        /* stuff that AudioTimeAxisView and related classes use */
 
        void clear_playlist (std::shared_ptr<ARDOUR::Playlist>);
 
        void clear_grouped_playlists (RouteUI* v);
 
        void get_onscreen_tracks (TrackViewList&);
 
        Width editor_mixer_strip_width;
        void maybe_add_mixer_strip_width (XMLNode&) const;
        void show_editor_mixer (bool yn);
        void create_editor_mixer ();
        void showhide_att_left (bool);
        void set_selected_mixer_strip (TimeAxisView&);
        void mixer_strip_width_changed ();
        void hide_track_in_display (TimeAxisView* tv, bool apply_to_selection = false);
        void show_track_in_display (TimeAxisView* tv, bool move_into_view = false);
        void tempo_curve_selected (Temporal::TempoPoint const * ts, bool yn);
 
        /* nudge is initiated by transport controls owned by ARDOUR_UI */
 
        Temporal::timecnt_t get_nudge_distance (Temporal::timepos_t const & pos, Temporal::timecnt_t& next) const;
        Temporal::timecnt_t get_paste_offset (Temporal::timepos_t const & pos, unsigned paste_count, Temporal::timecnt_t const & duration);
 
        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 ();
 
        void sequence_regions ();
 
        /* playhead/screen stuff */
 
        void set_stationary_playhead (bool yn);
        void toggle_stationary_playhead ();
        bool stationary_playhead() const { return _stationary_playhead; }
 
        bool dragging_playhead () const { return _dragging_playhead; }
 
        void toggle_zero_line_visibility ();
        void set_summary ();
        void set_group_tabs ();
 
        /* returns the left-most and right-most time that the gui should allow the user to scroll to */
        std::pair <Temporal::timepos_t,Temporal::timepos_t> session_gui_extents (bool use_extra = true) const;
 
        /* RTAV Automation display option */
        bool show_touched_automation () const;
 
        /* fades */
 
        void toggle_region_fades (int dir);
        void update_region_fade_visibility ();
 
        /* floating windows/transient */
 
        void ensure_float (Gtk::Window&);
 
        void scroll_tracks_down_line ();
        void scroll_tracks_up_line ();
 
        bool scroll_up_one_track (bool skip_child_views = false);
        bool scroll_down_one_track (bool skip_child_views = false);
 
        void scroll_left_step ();
        void scroll_right_step ();
 
        void scroll_left_half_page ();
        void scroll_right_half_page ();
 
        void select_topmost_track ();
 
        void cleanup_regions ();
 
        void prepare_for_cleanup ();
        void finish_cleanup ();
 
        void maximise_editing_space();
        void restore_editing_space();
 
        double get_y_origin () const;
        void reposition_and_zoom (samplepos_t, double);
 
        void toggle_meter_updating();
 
        void show_rhythm_ferret();
 
        void goto_visual_state (uint32_t);
        void save_visual_state (uint32_t);
 
        TrackViewList const & get_track_views () const {
                return track_views;
        }
 
        void do_import (std::vector<std::string>              paths,
                        Editing::ImportDisposition            disposition,
                        Editing::ImportMode                   mode,
                        ARDOUR::SrcQuality                    quality,
                        ARDOUR::MidiTrackNameSource           mts,
                        ARDOUR::MidiTempoMapDisposition       mtd,
                        Temporal::timepos_t&                  pos,
                        std::shared_ptr<ARDOUR::PluginInfo> instrument = std::shared_ptr<ARDOUR::PluginInfo>(),
                        std::shared_ptr<ARDOUR::Track>      track = std::shared_ptr<ARDOUR::Track>(),
                        bool with_markers = false);
 
        void do_embed (std::vector<std::string>              paths,
                       Editing::ImportDisposition            disposition,
                       Editing::ImportMode                   mode,
                       Temporal::timepos_t&                  pos,
                       std::shared_ptr<ARDOUR::PluginInfo> instrument = std::shared_ptr<ARDOUR::PluginInfo>(),
                       std::shared_ptr<ARDOUR::Track>      track = std::shared_ptr<ARDOUR::Track>());
 
        void get_regionview_corresponding_to (std::shared_ptr<ARDOUR::Region> region, std::vector<RegionView*>& regions);
 
        void get_regionviews_by_id (PBD::ID const id, RegionSelection & regions) const;
        void get_per_region_note_selection (std::list<std::pair<PBD::ID, std::set<std::shared_ptr<Evoral::Note<Temporal::Beats> > > > >&) const;
 
        TrackViewList axis_views_from_routes (std::shared_ptr<ARDOUR::RouteList>) const;
 
        void set_snapped_cursor_position (Temporal::timepos_t const & pos);
 
        void begin_selection_op_history ();
        void begin_reversible_selection_op (std::string cmd_name);
        void commit_reversible_selection_op ();
        void abort_reversible_selection_op ();
        void undo_selection_op ();
        void redo_selection_op ();
        void add_command (PBD::Command* cmd);
        void add_commands (std::vector<PBD::Command*> cmds);
 
        PBD::HistoryOwner& history();
 
        void begin_reversible_command (std::string cmd_name);
        void begin_reversible_command (GQuark);
        void abort_reversible_command ();
        void commit_reversible_command ();
 
        MixerStrip* get_current_mixer_strip () const {
                return current_mixer_strip;
        }
 
        void maybe_autoscroll (bool, bool, bool);
        bool autoscroll_active() const;
 
        void set_current_trimmable (std::shared_ptr<ARDOUR::Trimmable>);
        void set_current_movable (std::shared_ptr<ARDOUR::Movable>);
 
        double clamp_verbose_cursor_x (double);
        double clamp_verbose_cursor_y (double);
 
        void get_pointer_position (double &, double &) const;
 
        TimeAxisView* stepping_axis_view () {
                return _stepping_axis_view;
        }
 
        void set_stepping_axis_view (TimeAxisView* v) {
                _stepping_axis_view = v;
        }
 
        ArdourCanvas::Container* get_trackview_group () const { return _trackview_group; }
        ArdourCanvas::Container* get_noscroll_group () const { return no_scroll_group; }
        ArdourCanvas::ScrollGroup* get_hscroll_group () const { return h_scroll_group; }
        ArdourCanvas::ScrollGroup* get_hvscroll_group () const { return hv_scroll_group; }
        ArdourCanvas::ScrollGroup* get_cursor_scroll_group () const { return cursor_scroll_group; }
        ArdourCanvas::Container* get_drag_motion_group () const { return _drag_motion_group; }
 
        ArdourCanvas::GtkCanvasViewport* get_canvas_viewport () const;
        ArdourCanvas::GtkCanvas* get_canvas () const;
 
        void override_visible_track_count ();
 
        /* Ruler metrics methods */
 
        void metric_get_timecode (std::vector<ArdourCanvas::Ruler::Mark>&, int64_t, int64_t, gint);
        void metric_get_bbt (std::vector<ArdourCanvas::Ruler::Mark>&, int64_t, int64_t, gint);
        void metric_get_samples (std::vector<ArdourCanvas::Ruler::Mark>&, int64_t, int64_t, gint);
        void metric_get_minsec (std::vector<ArdourCanvas::Ruler::Mark>&, int64_t, int64_t, gint);
 
        /* editing operations that need to be public */
        void split_regions_at (Temporal::timepos_t const & , RegionSelection&);
        void split_region_at_points (std::shared_ptr<ARDOUR::Region>, ARDOUR::AnalysisFeatureList&, bool can_ferret, bool select_new = false);
        RegionSelection get_regions_from_selection_and_mouse (Temporal::timepos_t const &);
        void do_remove_gaps ();
        void remove_gaps (Temporal::timecnt_t const & threshold, Temporal::timecnt_t const & leave, bool markers_too);
 
        void mouse_brush_insert_region (RegionView*, Temporal::timepos_t const & pos);
 
        void mouse_add_new_tempo_event (Temporal::timepos_t where);
        void mouse_add_new_meter_event (Temporal::timepos_t where);
        void edit_tempo_section (Temporal::TempoPoint&);
        void edit_meter_section (Temporal::MeterPoint&);
        void mouse_add_bbt_marker_event (Temporal::timepos_t where);
        void add_bbt_marker_at_playhead_cursor ();
 
        void edit_bbt (Temporal::MusicTimePoint&);
 
        bool should_ripple () const;
        bool should_ripple_all () const;  /* RippleAll will ripple all similar regions and the timeline markers */
        void do_ripple (std::shared_ptr<ARDOUR::Playlist>, Temporal::timepos_t const &, Temporal::timecnt_t const &, ARDOUR::RegionList* exclude, ARDOUR::PlaylistSet const& affected_pls, bool add_to_command);
        void do_ripple (std::shared_ptr<ARDOUR::Playlist>, Temporal::timepos_t const &, Temporal::timecnt_t const &, std::shared_ptr<ARDOUR::Region> exclude, bool add_to_command);
        void ripple_marks (std::shared_ptr<ARDOUR::Playlist> target_playlist, Temporal::timepos_t at, Temporal::timecnt_t const & distance);
        void get_markers_to_ripple (std::shared_ptr<ARDOUR::Playlist> target_playlist, Temporal::timepos_t const & pos, std::vector<ArdourMarker*>& markers);
        Temporal::timepos_t effective_ripple_mark_start (std::shared_ptr<ARDOUR::Playlist> target_playlist, Temporal::timepos_t pos);
 
        void add_region_marker ();
        void clear_region_markers ();
        void remove_region_marker (ARDOUR::CueMarker&);
        void make_region_markers_global (bool as_cd_markers);
 
        bool rb_click (GdkEvent*, Temporal::timepos_t const &);
        void line_drag_click (GdkEvent*, Temporal::timepos_t const &, double);
 
        void focus_on_clock();
 
        void set_zoom_focus (Editing::ZoomFocus);
 
        void temporal_zoom_selection (Editing::ZoomAxis);
        void temporal_zoom_session ();
        void temporal_zoom_extents ();
 
        void find_and_display_track ();
 
protected:
        void map_transport_state ();
        void map_position_change (samplepos_t);
        void transport_looped ();
 
        void on_realize();
 
        void suspend_route_redisplay ();
        void resume_route_redisplay ();
 
        RegionSelection region_selection();
 
        void do_undo (uint32_t n);
        void do_redo (uint32_t n);
 
        Temporal::timepos_t _get_preferred_edit_position (Editing::EditIgnoreOption, bool use_context_click, bool from_outside_canvas);
 
private:
 
        void color_handler ();
        void dpi_reset ();
        bool constructed;
 
        // to keep track of the playhead position for control_scroll
        std::optional<samplepos_t> _control_scroll_target;
 
        Gtk::HBox                    _bottom_hbox;
        SelectionPropertiesBox*      _properties_box;
        Pianoroll*                   _pianoroll;
 
        typedef std::pair<TimeAxisView*,XMLNode*> TAVState;
 
        struct VisualState {
                VisualState (bool with_tracks);
                ~VisualState ();
                double              y_position;
                samplecnt_t         samples_per_pixel;
                samplepos_t        _leftmost_sample;
                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);
 
        void set_samples_per_pixel (samplecnt_t);
        void on_samples_per_pixel_changed ();
 
        Editing::MouseMode effective_mouse_mode () const;
        void use_appropriate_mouse_mode_for_sections ();
 
        Editing::MarkerClickBehavior marker_click_behavior;
 
        enum JoinObjectRangeState {
                JOIN_OBJECT_RANGE_NONE,
                JOIN_OBJECT_RANGE_OBJECT,
                JOIN_OBJECT_RANGE_RANGE
        };
 
        JoinObjectRangeState _join_object_range_state;
 
        void update_join_object_range_location (double);
 
        Gtk::VBox                 _editor_list_vbox;
        Gtk::Notebook             _the_notebook;
        ArdourWidgets::MetaButton _notebook_tab1;
        ArdourWidgets::MetaButton _notebook_tab2;
 
        void add_notebook_page (std::string const&, std::string const&, Gtk::Widget&);
 
        ArdourWidgets::VPane editor_summary_pane;
 
        Gtk::EventBox meter_base;
        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 refresh_location_display ();
        void update_section_rects ();
        bool section_rect_event (GdkEvent*, ARDOUR::Location*, ArdourCanvas::Rectangle*, std::string);
        void refresh_location_display_internal (const ARDOUR::Locations::LocationList&);
        void add_new_location (ARDOUR::Location*);
        ArdourCanvas::Container* add_new_location_internal (ARDOUR::Location*);
        void location_gone (ARDOUR::Location*);
        void loop_location_changed (ARDOUR::Location*);
        void remove_marker (ArdourCanvas::Item&);
        void remove_marker (ArdourMarker*);
        gint really_remove_global_marker (ARDOUR::Location* loc);
        gint really_remove_region_marker (ArdourMarker*);
        void goto_nth_marker (int nth);
        void jump_to_loop_marker (bool start);
        void trigger_script (int nth);
        void trigger_script_by_name (const std::string script_name, const std::string args = "");
        void toggle_marker_lines ();
        void set_marker_line_visibility (bool);
        void update_selection_markers ();
        void update_section_box ();
        void capture_sources_changed (bool);
 
        void jump_forward_to_mark_flagged (ARDOUR::Location::Flags, ARDOUR::Location::Flags, ARDOUR::Location::Flags);
        void jump_backward_to_mark_flagged (ARDOUR::Location::Flags, ARDOUR::Location::Flags, ARDOUR::Location::Flags);
 
        struct LocationMarkers {
                ArdourMarker* start;
                ArdourMarker* 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 set_entered (bool);
                void setup_lines ();
 
                void set_name (const std::string&);
                void set_position (Temporal::timepos_t const & start, Temporal::timepos_t const & end = Temporal::timepos_t());
                void set_color (std::string const&);
        };
 
        void reparent_location_markers (LocationMarkers*, ArdourCanvas::Item*);
 
        ArdourCanvas::Duple upper_left() const;
 
        LocationMarkers*  find_location_markers (ARDOUR::Location*) const;
        ARDOUR::Location* find_location_from_marker (ArdourMarker*, bool& is_start) const;
        ArdourMarker* find_marker_from_location_id (PBD::ID const&, bool) const;
        TempoMarker* find_marker_for_tempo (Temporal::TempoPoint const &);
        MeterMarker* find_marker_for_meter (Temporal::MeterPoint const &);
        bool _show_marker_lines;
 
        typedef std::map<ARDOUR::Location*,LocationMarkers*> LocationMarkerMap;
        LocationMarkerMap location_markers;
 
        void update_marker_labels ();
        void update_marker_labels (ArdourCanvas::Item*);
        void check_marker_label (ArdourMarker*);
 
        std::map<ArdourCanvas::Item*, std::list<ArdourMarker*> > _sorted_marker_lists;
        void remove_sorted_marker (ArdourMarker*);
 
        void hide_marker (ArdourCanvas::Item*, GdkEvent*);
        void clear_marker_display ();
        void mouse_add_new_range (Temporal::timepos_t);
        void mouse_add_new_loop (Temporal::timepos_t);
        void mouse_add_new_punch (Temporal::timepos_t);
        bool choose_new_marker_name(std::string &name, bool is_range=false);
        void update_marker_display ();
        void ensure_marker_updated (LocationMarkers* lam, ARDOUR::Location* location);
        void update_all_marker_lanes ();
 
        TimeAxisView*      clicked_axisview;
        RouteTimeAxisView* clicked_routeview;
        RegionView*        clicked_regionview;
        RegionSelection    latest_regionviews;
        uint32_t           clicked_selection;
        ControlPoint*      clicked_control_point;
 
        void sort_track_selection (TrackViewList&);
 
        void get_equivalent_regions (RegionView* rv, std::vector<RegionView*> &, PBD::PropertyID) const;
        void get_all_equivalent_regions (RegionView* rv, std::vector<RegionView*> &) const;
        RegionSelection get_equivalent_regions (RegionSelection &, PBD::PropertyID) const;
        RegionView* regionview_from_region (std::shared_ptr<ARDOUR::Region>) const;
        RouteTimeAxisView* rtav_from_route (std::shared_ptr<ARDOUR::Route>) const;
 
        void mapover_tracks_with_unique_playlists (sigc::slot<void,RouteTimeAxisView&,uint32_t> sl, TimeAxisView*, PBD::PropertyID) const;
        void mapover_all_tracks_with_unique_playlists (sigc::slot<void,RouteTimeAxisView&,uint32_t>) const;
        void mapped_get_equivalent_regions (RouteTimeAxisView&, uint32_t, RegionView*, std::vector<RegionView*>*) const;
 
        void mapover_grouped_routes (sigc::slot<void, RouteUI&> sl, RouteUI*, PBD::PropertyID) const;
        void mapover_armed_routes (sigc::slot<void, RouteUI&> sl) const;
        void mapover_selected_routes (sigc::slot<void, RouteUI&> sl) const;
        void mapover_all_routes (sigc::slot<void, RouteUI&> sl) const;
 
        void mapped_select_playlist_matching (RouteUI&, std::weak_ptr<ARDOUR::Playlist> pl);
        void mapped_use_new_playlist (RouteUI&, std::string name, std::string gid, bool copy, std::vector<std::shared_ptr<ARDOUR::Playlist> > const &);
        void mapped_clear_playlist (RouteUI&);
 
        void new_playlists_for_all_tracks(bool copy);
        void new_playlists_for_grouped_tracks(RouteUI* v, bool copy);
        void new_playlists_for_selected_tracks(bool copy);
        void new_playlists_for_armed_tracks(bool copy);
 
        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&, ARDOUR::SelectionOperation op = ARDOUR::SelectionSet, bool no_remove=false);
        void select_all_visible_lanes ();
        void select_all_tracks ();
        bool select_all_internal_edit (ARDOUR::SelectionOperation);
 
        bool set_selected_control_point_from_click (bool press, ARDOUR::SelectionOperation op = ARDOUR::SelectionSet);
        void set_selected_track_from_click (bool press, ARDOUR::SelectionOperation op = ARDOUR::SelectionSet, bool no_remove=false);
        void set_selected_track_as_side_effect (ARDOUR::SelectionOperation op, PBD::Controllable::GroupControlDisposition gcd = PBD::Controllable::UseGroup);
        bool set_selected_regionview_from_click (bool press, ARDOUR::SelectionOperation op = ARDOUR::SelectionSet);
 
        bool set_selected_regionview_from_map_event (GdkEventAny*, StreamView*, std::weak_ptr<ARDOUR::Region>);
        void collect_new_region_view (RegionView*);
        void collect_and_select_new_region_view (RegionView*);
 
        Gtk::Menu section_box_menu;
        Gtk::Menu track_context_menu;
        Gtk::Menu track_region_context_menu;
        Gtk::Menu track_selection_context_menu;
 
        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_selection_context_menu ();
        void add_section_context_items (Gtk::Menu_Helpers::MenuList&);
        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&, std::shared_ptr<ARDOUR::Track>);
        void add_selection_context_items (Gtk::Menu_Helpers::MenuList&, bool time_selection_only = false);
        Gtk::MenuItem* _popup_region_menu_item;
 
        void popup_control_point_context_menu (ArdourCanvas::Item*, GdkEvent*);
        Gtk::Menu _control_point_context_menu;
 
        void initial_display ();
        void add_stripables (ARDOUR::StripableList&);
        void add_routes (ARDOUR::RouteList&);
        void timeaxisview_deleted (TimeAxisView*);
        void add_vcas (ARDOUR::VCAList&);
 
        Gtk::VBox global_vpacker;
 
        Gdk::Cursor* which_track_cursor () const;
        Gdk::Cursor* which_mode_cursor () const;
        Gdk::Cursor* which_trim_cursor (bool left_side) const;
        Gdk::Cursor* which_canvas_cursor (ItemType type) const;
 
        ApplicationBar           _application_bar;
        ArdourCanvas::GtkCanvas* _track_canvas;
        ArdourCanvas::GtkCanvasViewport* _track_canvas_viewport;
 
        RegionPeakCursor* _region_peak_cursor;
 
        void parameter_changed (std::string);
        void ui_parameter_changed (std::string);
 
        Gtk::EventBox            time_bars_event_box;
        Gtk::VBox                time_bars_vbox;
 
        ArdourCanvas::Container* tempo_group;
        ArdourCanvas::Container* meter_group;
        ArdourCanvas::Container* marker_group;
        ArdourCanvas::Container* range_marker_group;
        ArdourCanvas::Container* section_marker_group;
 
        /* parent for groups which themselves contain time markers */
        ArdourCanvas::Container* _time_markers_group;
 
        /* parent for group for selection marker (above ruler) */
        ArdourCanvas::Container* _selection_marker_group;
        LocationMarkers*         _selection_marker;
 
        /* The group containing all other groups that are scrolled vertically
           and horizontally.
        */
        ArdourCanvas::ScrollGroup* hv_scroll_group;
 
        /* The group containing all other groups that are scrolled horizontally ONLY
        */
        ArdourCanvas::ScrollGroup* h_scroll_group;
 
        /* Scroll group for cursors, scrolled horizontally, above everything else
        */
        ArdourCanvas::ScrollGroup* cursor_scroll_group;
 
        /* The group containing all trackviews. */
        ArdourCanvas::Container* no_scroll_group;
 
        /* The group containing all trackviews. */
        ArdourCanvas::Container* _trackview_group;
 
        /* The group holding things (mostly regions) while dragging so they
         * are on top of everything else
         */
        ArdourCanvas::Container* _drag_motion_group;
 
        /* a rect that sits at the bottom of all tracks to act as a drag-no-drop/clickable
         * target area.
         */
        ArdourCanvas::Rectangle* _canvas_drop_zone;
        bool canvas_drop_zone_event (GdkEvent* event);
 
        ArdourCanvas::Rectangle* _canvas_grid_zone;
        bool canvas_grid_zone_event (GdkEvent* event);
 
        static Gtk::Table* setup_ruler_new (Gtk::HBox&, std::vector<Gtk::Label*>&, std::string const&);
        static Gtk::Table* setup_ruler_new (Gtk::HBox&, std::vector<Gtk::Label*>&, Gtk::Label*);
        static void        setup_ruler_add (Gtk::Table*, ArdourWidgets::ArdourButton&, int pos = 0);
 
        Glib::RefPtr<Gtk::ToggleAction> ruler_minsec_action;
        Glib::RefPtr<Gtk::ToggleAction> ruler_timecode_action;
        Glib::RefPtr<Gtk::ToggleAction> ruler_samples_action;
        Glib::RefPtr<Gtk::ToggleAction> ruler_bbt_action;
        Glib::RefPtr<Gtk::ToggleAction> ruler_meter_action;
        Glib::RefPtr<Gtk::ToggleAction> ruler_tempo_action;
        Glib::RefPtr<Gtk::ToggleAction> ruler_range_action;
        Glib::RefPtr<Gtk::ToggleAction> ruler_section_action;
        Glib::RefPtr<Gtk::ToggleAction> ruler_marker_action;
        bool                            no_ruler_shown_update;
 
        Glib::RefPtr<Gtk::RadioAction> all_marker_action;
        Glib::RefPtr<Gtk::RadioAction> cd_marker_action;
        Glib::RefPtr<Gtk::RadioAction> scene_marker_action;
        Glib::RefPtr<Gtk::RadioAction> cue_marker_action;
        Glib::RefPtr<Gtk::RadioAction> location_marker_action;
 
        Glib::RefPtr<Gtk::RadioAction> all_range_action;
        Glib::RefPtr<Gtk::RadioAction> punch_range_action;
        Glib::RefPtr<Gtk::RadioAction> loop_range_action;
        Glib::RefPtr<Gtk::RadioAction> session_range_action;
        Glib::RefPtr<Gtk::RadioAction> other_range_action;
 
        Gtk::Widget* ruler_grabbed_widget;
 
        RulerDialog* ruler_dialog;
 
        void initialize_rulers ();
        void initialize_ruler_actions ();
        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 (Temporal::timepos_t const & where = Temporal::timepos_t (), ItemType type = RegionItem);
        void update_ruler_visibility ();
        void toggle_ruler_visibility ();
        void ruler_toggled (int);
        bool ruler_label_button_release (GdkEventButton*);
        void store_ruler_visibility ();
        void restore_ruler_visibility ();
        void show_rulers_for_grid ();
 
        enum MinsecRulerScale {
                minsec_show_msecs,
                minsec_show_seconds,
                minsec_show_minutes,
                minsec_show_hours,
                minsec_show_many_hours
        };
 
        MinsecRulerScale minsec_ruler_scale;
 
        samplecnt_t minsec_mark_interval;
        gint minsec_mark_modulo;
        gint minsec_nmarks;
        void set_minsec_ruler_scale (samplepos_t, samplepos_t);
 
        enum TimecodeRulerScale {
                timecode_show_bits,
                timecode_show_samples,
                timecode_show_seconds,
                timecode_show_minutes,
                timecode_show_hours,
                timecode_show_many_hours
        };
 
        TimecodeRulerScale timecode_ruler_scale;
 
        gint timecode_mark_modulo;
        gint timecode_nmarks;
        void set_timecode_ruler_scale (samplepos_t, samplepos_t);
 
        samplecnt_t _samples_ruler_interval;
        void set_samples_ruler_scale (samplepos_t, samplepos_t);
 
        ArdourCanvas::Ruler* timecode_ruler;
        ArdourCanvas::Ruler* bbt_ruler;
        ArdourCanvas::Ruler* samples_ruler;
        ArdourCanvas::Ruler* minsec_ruler;
 
        static double timebar_height;
        guint32 visible_timebars;
        Gtk::Menu* editor_ruler_menu;
 
        ArdourCanvas::Rectangle* tempo_bar;
        ArdourCanvas::Rectangle* meter_bar;
        ArdourCanvas::Rectangle* marker_bar;
        ArdourCanvas::Rectangle* range_marker_bar;
        ArdourCanvas::Rectangle* section_marker_bar;
        ArdourCanvas::Line*      ruler_separator;
 
        void toggle_cue_behavior ();
 
        Gtk::HBox _ruler_box_minsec;
        Gtk::HBox _ruler_box_timecode;
        Gtk::HBox _ruler_box_samples;
        Gtk::HBox _ruler_box_bbt;
        Gtk::HBox _ruler_box_tempo;
        Gtk::HBox _ruler_box_meter;
        Gtk::HBox _ruler_box_range;
        Gtk::HBox _ruler_box_marker;
        Gtk::HBox _ruler_box_section;
        Gtk::HBox _ruler_box_videotl;
 
        std::vector<Gtk::Label*> _ruler_labels;
 
        ArdourWidgets::ArdourButton  _ruler_btn_tempo_add;
        ArdourWidgets::ArdourButton  _ruler_btn_meter_add;
        ArdourWidgets::ArdourButton  _ruler_btn_range_prev;
        ArdourWidgets::ArdourButton  _ruler_btn_range_next;
        ArdourWidgets::ArdourButton  _ruler_btn_range_add;
        ArdourWidgets::ArdourButton  _ruler_btn_loc_prev;
        ArdourWidgets::ArdourButton  _ruler_btn_loc_next;
        ArdourWidgets::ArdourButton  _ruler_btn_loc_add;
        ArdourWidgets::ArdourButton  _ruler_btn_section_prev;
        ArdourWidgets::ArdourButton  _ruler_btn_section_next;
        ArdourWidgets::ArdourButton  _ruler_btn_section_add;
 
        /* videtimline related actions */
        Gtk::Label                      videotl_label;
        ArdourCanvas::Container*        videotl_group;
        Glib::RefPtr<Gtk::ToggleAction> ruler_video_action;
        Glib::RefPtr<Gtk::ToggleAction> xjadeo_proc_action;
        Glib::RefPtr<Gtk::ToggleAction> xjadeo_ontop_action;
        Glib::RefPtr<Gtk::ToggleAction> xjadeo_timecode_action;
        Glib::RefPtr<Gtk::ToggleAction> xjadeo_frame_action;
        Glib::RefPtr<Gtk::ToggleAction> xjadeo_osdbg_action;
        Glib::RefPtr<Gtk::ToggleAction> xjadeo_fullscreen_action;
        Glib::RefPtr<Gtk::ToggleAction> xjadeo_letterbox_action;
        Glib::RefPtr<Gtk::Action> xjadeo_zoom_100;
        void set_xjadeo_proc ();
        void toggle_xjadeo_proc (int state=-1);
        void set_close_video_sensitive (bool onoff);
        void set_xjadeo_sensitive (bool onoff);
        void set_xjadeo_viewoption (int);
        void toggle_xjadeo_viewoption (int what, int state=-1);
        void toggle_ruler_video (bool onoff) {ruler_video_action->set_active(onoff);}
        int videotl_bar_height; /* in units of timebar_height; default: 4 */
        int get_videotl_bar_height () const { return videotl_bar_height; }
        void toggle_region_video_lock ();
 
        samplepos_t playhead_cursor_sample () const;
 
        Temporal::timepos_t get_region_boundary (Temporal::timepos_t const & 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, bool);
        void    select_all_selectables_between (bool within);
        void    select_range_between ();
 
        std::shared_ptr<ARDOUR::Region> find_next_region (Temporal::timepos_t const &, ARDOUR::RegionPoint, int32_t dir, TrackViewList&, TimeAxisView** = 0);
        Temporal::timepos_t find_next_region_boundary (Temporal::timepos_t const &, int32_t dir, const TrackViewList&);
 
        std::set<Temporal::timepos_t> region_boundary_cache;
        void mark_region_boundary_cache_dirty () { _region_boundary_cache_dirty = true; }
        void build_region_boundary_cache ();
        bool    _region_boundary_cache_dirty;
 
        Gtk::HBox           toplevel_hpacker;
 
        Gtk::HBox           bottom_hbox;
 
        Gtk::Table          edit_packer;
 
        Gtk::Adjustment     unused_adjustment; // yes, really; Gtk::Layout constructor requires refs
        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 _full_canvas_height;    
 
        bool track_canvas_map_handler (GdkEventAny*);
 
        bool edit_controls_button_event (GdkEventButton*);
        Gtk::Menu* edit_controls_left_menu;
        Gtk::Menu* edit_controls_right_menu;
 
        Gtk::VBox           track_canvas_vbox;
        Gtk::VBox           edit_controls_vbox;
        Gtk::HBox           edit_controls_hbox;
 
        TriggerClipPicker    _trigger_clip_picker;
 
        void control_vertical_zoom_in_all ();
        void control_vertical_zoom_out_all ();
        void control_vertical_zoom_in_selected ();
        void control_vertical_zoom_out_selected ();
        void control_step_tracks_up ();
        void control_step_tracks_down ();
        void control_view (uint32_t);
        void control_scroll (float);
        void access_action (const std::string&, const std::string&);
        void set_toggleaction (const std::string&, const std::string&, bool);
        bool deferred_control_scroll (samplepos_t);
        sigc::connection control_scroll_connection;
 
        void tie_vertical_scrolling ();
 
        void visual_changer (const VisualChange&);
 
        /* track views */
        TrackViewList track_views;
 
        std::pair<TimeAxisView*, double> trackview_by_y_position (double, bool trackview_relative_offset = true) const;
 
        AxisView* axis_view_by_stripable (std::shared_ptr<ARDOUR::Stripable>) const;
        AxisView* axis_view_by_control (std::shared_ptr<ARDOUR::AutomationControl>) const;
 
        TimeAxisView* time_axis_view_from_stripable (std::shared_ptr<ARDOUR::Stripable> s) const {
                return dynamic_cast<TimeAxisView*> (axis_view_by_stripable (s));
        }
 
        TrackViewList get_tracks_for_range_action () const;
 
        Gtk::VBox list_vpacker;
 
        void queue_redisplay_track_views ();
        bool process_redisplay_track_views ();
        bool redisplay_track_views (); // do not call this directly, use above wrappers
 
        bool             _tvl_no_redisplay;
        bool             _tvl_redisplay_on_resume;
        sigc::connection _tvl_redisplay_connection;
 
        sigc::connection super_rapid_screen_update_connection;
 
        void super_rapid_screen_update ();
 
        int64_t _last_update_time;
        double _err_screen_engine;
 
        void session_going_away ();
 
        samplepos_t cut_buffer_start;
        samplecnt_t cut_buffer_length;
 
        std::weak_ptr<ARDOUR::Trimmable> _trimmable;
        std::weak_ptr<ARDOUR::Movable> _movable;
 
        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);
 
        /* KEYMAP HANDLING */
 
        void register_actions ();
        void register_region_actions ();
 
        void load_bindings ();
 
        /* CUT/COPY/PASTE */
 
        Temporal::timepos_t last_paste_pos;
        unsigned    paste_count;
 
        bool can_cut_copy () const;
        void cut_copy_points (Editing::CutCopyOp, Temporal::timepos_t const & earliest);
        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 (Temporal::timepos_t const & position, float times);
 
        /* EDITING OPERATIONS */
 
        void region_lock ();
        void region_unlock ();
        void toggle_region_lock ();
        void toggle_opaque_region ();
        void toggle_record_enable ();
        void toggle_solo ();
        void toggle_solo_isolate ();
        void toggle_mute ();
 
        void play_solo_selection (bool restart);
 
        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_region_at_transients ();
        void crop_region_to_selection ();
        void crop_region_to (Temporal::timepos_t const & start, Temporal::timepos_t const & end);
        void set_sync_point (Temporal::timepos_t const &, 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 (std::shared_ptr<ARDOUR::Region>, ARDOUR::RegionPoint point, Temporal::timepos_t const & position);
        void align_region_internal (std::shared_ptr<ARDOUR::Region>, ARDOUR::RegionPoint point, Temporal::timepos_t const & position);
        void recover_regions (ARDOUR::RegionList);
        void remove_selected_regions ();
        void remove_regions (const RegionSelection&, bool can_ripple, bool as_part_of_other_command);
        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 (std::shared_ptr<ARDOUR::Region>);
        void split_multichannel_region();
        void reverse_region ();
        void strip_region_silence ();
        void normalize_region ();
        void adjust_region_gain (bool up);
        void reset_region_gain ();
        void deinterlace_midi_regions (const RegionSelection& rs);
        void deinterlace_selected_midi_regions ();
        void set_tempo_curve_range (double& max, double& min) const;
        void insert_patch_change (bool from_context);
        void fork_selected_regions ();
        void fork_regions_from_unselected ();
        void start_track_drag (TimeAxisView&, int y, Gtk::Widget& w, bool can_change_cursor);
        void mid_track_drag (GdkEventMotion*, Gtk::Widget& e);
        void end_track_drag ();
        void maybe_move_tracks ();
        bool track_dragging() const;
 
        void do_insert_time ();
        void insert_time (Temporal::timepos_t const &, Temporal::timecnt_t const &, Editing::InsertTimeOption, bool, bool, bool, bool);
 
        void do_remove_time ();
        void remove_time (Temporal::timepos_t const & pos, Temporal::timecnt_t const & distance, Editing::InsertTimeOption opt, bool markers_too,
                          bool locked_markers_too, bool tempo_too);
 
        void tab_to_transient (bool forward);
 
        void set_tempo_from_region ();
        void use_range_as_bar ();
 
        void define_one_bar (Temporal::timepos_t const & start, Temporal::timepos_t const & end, std::string const & from);
 
        void audition_region_from_region_list ();
 
        void naturalize_region ();
 
        void split_region ();
 
        void delete_ ();
        void paste (float times, bool from_context_menu);
        void keyboard_paste ();
        void cut_copy (Editing::CutCopyOp);
 
        void place_transient ();
        void remove_transient (ArdourCanvas::Item* item);
        void snap_regions_to_grid ();
        void close_region_gaps ();
 
 
        void region_from_selection ();
        void create_region_from_selection (std::vector<std::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 group_selected_regions ();
        void ungroup_selected_regions ();
 
        std::shared_ptr<ARDOUR::Playlist> current_playlist () const;
        void insert_source_list_selection (float times);
        void cut_copy_section (ARDOUR::SectionOperation const op);
 
        /* import & embed */
 
        void add_external_audio_action (Editing::ImportMode);
 
        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,  samplepos_t& pos);
 
        bool  idle_drop_paths  (std::vector<std::string> paths, Temporal::timepos_t sample, double ypos, bool copy);
        void  drop_paths_part_two  (const std::vector<std::string>& paths, Temporal::timepos_t const & sample, double ypos, bool copy);
 
        int import_sndfiles (std::vector<std::string>              paths,
                             Editing::ImportDisposition            disposition,
                             Editing::ImportMode                   mode,
                             ARDOUR::SrcQuality                    quality,
                             Temporal::timepos_t&                  pos,
                             int                                   target_regions,
                             int                                   target_tracks,
                             std::shared_ptr<ARDOUR::Track>&     track,
                             std::string const&                    pgroup_id,
                             bool                                  replace,
                             bool                                  with_markers,
                             std::shared_ptr<ARDOUR::PluginInfo> instrument = std::shared_ptr<ARDOUR::PluginInfo>());
 
        int embed_sndfiles (std::vector<std::string>              paths,
                            bool                                  multiple_files,
                            bool&                                 check_sample_rate,
                            Editing::ImportDisposition            disposition,
                            Editing::ImportMode                   mode,
                            Temporal::timepos_t&                  pos,
                            int                                   target_regions,
                            int                                   target_tracks,
                            std::shared_ptr<ARDOUR::Track>&     track,
                            std::string const&                    pgroup_id,
                            std::shared_ptr<ARDOUR::PluginInfo> instrument = std::shared_ptr<ARDOUR::PluginInfo>());
 
        int add_sources (std::vector<std::string>              paths,
                         ARDOUR::SourceList&                   sources,
                         Temporal::timepos_t&                  pos,
                         Editing::ImportDisposition            disposition,
                         Editing::ImportMode                   mode,
                         int                                   target_regions,
                         int                                   target_tracks,
                         std::shared_ptr<ARDOUR::Track>&     track,
                         std::string const&                    pgroup_id,
                         bool                                  add_channel_suffix,
                         std::shared_ptr<ARDOUR::PluginInfo> instrument = std::shared_ptr<ARDOUR::PluginInfo>());
 
        int finish_bringing_in_material (std::shared_ptr<ARDOUR::Region>     region,
                                         uint32_t                              in_chans,
                                         uint32_t                              out_chans,
                                         Temporal::timepos_t&                  pos,
                                         Editing::ImportMode                   mode,
                                         std::shared_ptr<ARDOUR::Track>&     existing_track,
                                         std::string const&                    new_track_name,
                                         std::string const&                    pgroup_id,
                                         std::shared_ptr<ARDOUR::PluginInfo> instrument);
 
        std::shared_ptr<ARDOUR::AudioTrack> get_nth_selected_audio_track (int nth) const;
        std::shared_ptr<ARDOUR::MidiTrack> get_nth_selected_midi_track (int nth) const;
 
        void toggle_midi_input_active (bool flip_others);
 
        ARDOUR::InterThreadInfo* current_interthread_info;
 
        AnalysisWindow* analysis_window;
 
        /* import & embed */
        void external_audio_dialog ();
        void session_import_dialog ();
 
        /* PT import specific */
        void external_pt_dialog ();
        ARDOUR::ImportStatus import_pt_status;
        static void*_import_pt_thread (void*);
        void* import_pt_thread ();
        PTFFormat import_ptf;
 
        /* import specific info */
 
        struct EditorImportStatus : public ARDOUR::ImportStatus {
                void clear () {
                        ARDOUR::ImportStatus::clear ();
                        track.reset ();
                }
 
                Editing::ImportMode mode;
                Temporal::timepos_t pos;
                int target_tracks;
                int target_regions;
                std::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 import_smf_tempo_map (Evoral::SMF const &, Temporal::timepos_t const & pos);
        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 move_selected_tracks (bool);
        void set_mark ();
        void clear_markers ();
        void clear_xrun_markers ();
        void clear_ranges ();
        void clear_cues ();
        void clear_scenes ();
        void clear_locations ();
        void unhide_markers ();
        void unhide_ranges ();
        void cursor_align (bool playhead_to_edit);
        void toggle_skip_playback ();
 
        void remove_last_capture ();
 
        void tag_last_capture ();
        void tag_selected_region ();
        void tag_regions (ARDOUR::RegionList);
 
        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_with_flag (Temporal::timepos_t const & where, ARDOUR::Location::Flags flag, int32_t cue_id);
        void add_location_from_region ();
        void add_locations_from_region ();
        void add_location_from_selection ();
        void add_section_from_playhead ();
        void set_loop_from_selection (bool play);
        void set_punch_from_selection ();
        void set_punch_from_region ();
        void set_auto_punch_range();
 
        void set_session_start_from_playhead ();
        void set_session_end_from_playhead ();
        void set_session_extents_from_selection ();
 
        void set_loop_from_region (bool play);
 
        void set_punch_range (Temporal::timepos_t const & start, Temporal::timepos_t const & end, std::string cmd);
 
        void add_tempo_from_playhead_cursor ();
        void add_meter_from_playhead_cursor ();
 
        void toggle_location_at_playhead_cursor ();
        void add_location_from_playhead_cursor ();
        bool do_remove_location_at_playhead_cursor ();
        void remove_location_at_playhead_cursor ();
        bool select_new_marker;
 
        void toggle_all_existing_automation ();
 
        void toggle_layer_display ();
        void layer_display_stacked ();
        void layer_display_overlaid ();
 
        void launch_playlist_selector ();
 
        void reverse_selection ();
        void edit_envelope ();
 
        void set_punch_start_from_edit_point ();
        void set_punch_end_from_edit_point ();
        void set_loop_start_from_edit_point ();
        void set_loop_end_from_edit_point ();
 
        void keyboard_selection_begin (Editing::EditIgnoreOption = Editing::EDIT_IGNORE_NONE);
        void keyboard_selection_finish (bool add, Editing::EditIgnoreOption = Editing::EDIT_IGNORE_NONE);
        bool have_pending_keyboard_selection;
        samplepos_t pending_keyboard_selection_start;
 
        void move_range_selection_start_or_end_to_region_boundary (bool, bool);
 
        bool ignore_gui_changes;
 
        void escape ();
        void lock ();
        void unlock ();
        Gtk::Dialog* lock_dialog;
 
        int64_t _last_event_time;
 
        bool generic_event_handler (GdkEvent*);
        bool lock_timeout_callback ();
        void start_lock_event_timing ();
 
        Gtk::Menu fade_context_menu;
 
        Gtk::Menu xfade_in_context_menu;
        Gtk::Menu xfade_out_context_menu;
        void popup_xfade_in_context_menu (int, int, ArdourCanvas::Item*, ItemType);
        void popup_xfade_out_context_menu (int, int, ArdourCanvas::Item*, ItemType);
        void fill_xfade_menu (Gtk::Menu_Helpers::MenuList& items, bool start);
 
        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);
 
        void fade_range ();
 
        ARDOUR::PlaylistSet motion_frozen_playlists;
 
        bool _dragging_playhead;
 
        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*, bool copy);
        void start_create_region_grab (ArdourCanvas::Item*, GdkEvent*);
        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*);
 
        /* Canvas event handlers */
 
        bool canvas_scroll_event (GdkEventScroll* event, bool from_canvas);
        bool canvas_control_point_event (GdkEvent* event,ArdourCanvas::Item*, ControlPoint*);
        bool canvas_velocity_event (GdkEvent* event,ArdourCanvas::Item*);
        bool canvas_velocity_base_event (GdkEvent* event,ArdourCanvas::Item*);
        bool canvas_line_event (GdkEvent* event,ArdourCanvas::Item*, EditorAutomationLine*);
        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_start_xfade_event (GdkEvent* event,ArdourCanvas::Item*, AudioRegionView*);
        bool canvas_end_xfade_event (GdkEvent* event,ArdourCanvas::Item*, AudioRegionView*);
        bool canvas_fade_in_event (GdkEvent* event,ArdourCanvas::Item*, AudioRegionView*);
        bool canvas_fade_in_handle_event (GdkEvent* event,ArdourCanvas::Item*, AudioRegionView*, bool trim = false);
        bool canvas_fade_out_event (GdkEvent* event,ArdourCanvas::Item*, AudioRegionView*);
        bool canvas_fade_out_handle_event (GdkEvent* event,ArdourCanvas::Item*, AudioRegionView*, bool trim = false);
        bool canvas_region_view_event (GdkEvent* event,ArdourCanvas::Item*, RegionView*);
        bool canvas_wave_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*, ArdourMarker*);
        bool canvas_tempo_marker_event (GdkEvent* event,ArdourCanvas::Item*, TempoMarker*);
        bool canvas_tempo_curve_event (GdkEvent* event,ArdourCanvas::Item*, TempoCurve*);
        bool canvas_meter_marker_event (GdkEvent* event,ArdourCanvas::Item*, MeterMarker*);
        bool canvas_bbt_marker_event (GdkEvent* event,ArdourCanvas::Item*, BBTMarker*);
        bool canvas_automation_track_event(GdkEvent* event, ArdourCanvas::Item*, AutomationTimeAxisView*);
        bool canvas_note_event (GdkEvent* event, ArdourCanvas::Item*);
        bool canvas_bg_event (GdkEvent* event, ArdourCanvas::Item*);
 
        bool canvas_ruler_event (GdkEvent* event, ArdourCanvas::Item*, ItemType);
        bool canvas_ruler_bar_event (GdkEvent* event, ArdourCanvas::Item*, ItemType, std::string const&);
        bool canvas_selection_marker_event (GdkEvent* event, ArdourCanvas::Item*);
 
        bool canvas_videotl_bar_event (GdkEvent* event, ArdourCanvas::Item*);
        void update_video_timeline (bool flush = false);
        void set_video_timeline_height (const int, bool force = false);
        bool is_video_timeline_locked ();
        void toggle_video_timeline_locked ();
        void set_video_timeline_locked (const bool);
        void queue_visual_videotimeline_update ();
        void embed_audio_from_video (std::string, samplepos_t n = 0, bool lock_position_to_video = true);
 
        bool track_selection_change_without_scroll () const {
                return _track_selection_change_without_scroll;
        }
 
        PBD::Signal<void()> EditorFreeze;
        PBD::Signal<void()> EditorThaw;
 
        Temporal::TempoMap::WritableSharedPtr begin_tempo_map_edit ();
        void abort_tempo_map_edit ();
        void mid_tempo_per_track_update (TimeAxisView&);
        void mid_tempo_per_region_update (RegionView*);
        bool ignore_map_change;
 
        Temporal::TempoMap::WritableSharedPtr begin_tempo_mapping (Temporal::DomainBounceInfo&);
        void abort_tempo_mapping ();
        void commit_tempo_mapping (Temporal::TempoMap::WritableSharedPtr&);
 
        enum MidTempoChanges {
                TempoChanged = 0x1,
                MeterChanged = 0x2,
                BBTChanged   = 0x4,
                MappingChanged = 0x8
        };
 
        void mid_tempo_change (MidTempoChanges);
 
        Editing::EditPoint edit_point() const { return _edit_point; }
        bool canvas_playhead_cursor_event (GdkEvent* event, ArdourCanvas::Item*);
 
        enum MarkerBarType {
                CueMarks = 0x1,
                SceneMarks = 0x2,
                CDMarks = 0x4,
                LocationMarks = 0x8
        };
 
        enum RangeBarType {
                PunchRange = 0x1,
                LoopRange = 0x2,
                SessionRange = 0x4,
                OtherRange = 0x8
        };
 
        static const MarkerBarType all_marker_types = MarkerBarType (CueMarks|SceneMarks|CDMarks|LocationMarks);
        static const RangeBarType all_range_types = RangeBarType (PunchRange|LoopRange|SessionRange|OtherRange);
 
        MarkerBarType visible_marker_types () const;
        RangeBarType visible_range_types () const;
 
        void set_visible_marker_types (MarkerBarType);
        void set_visible_range_types (RangeBarType);
 
protected:
        void _commit_tempo_map_edit (Temporal::TempoMap::WritableSharedPtr&, bool with_update = false);
        void automation_create_point_at_edit_point();
        void automation_raise_points ();
        void automation_lower_points ();
        void automation_move_points_later ();
        void automation_move_points_earlier ();
 
private:
        friend class DragManager;
        friend class EditorRouteGroups;
        friend class EditorRegions;
        friend class EditorSections;
        friend class EditorSources;
 
        /* non-public event handlers */
 
        bool canvas_section_box_event (GdkEvent* event);
        bool track_canvas_scroll (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_viewport_allocation;
        void track_canvas_viewport_allocate (Gtk::Allocation alloc);
        void track_canvas_viewport_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 ();
 
        /* playlist internal ops */
 
        bool stamp_new_playlist (std::string title, std::string &name, std::string &pgroup, bool copy);
 
        /* display control */
 
        bool _stationary_playhead;
        bool _maximised;
 
        ArdourCanvas::Container* global_rect_group;
 
        void new_tempo_section ();
 
        void remove_tempo_marker (ArdourCanvas::Item*);
        void remove_meter_marker (ArdourCanvas::Item*);
        void remove_bbt_marker (ArdourCanvas::Item*);
        gint real_remove_tempo_marker (Temporal::TempoPoint const *);
        gint real_remove_meter_marker (Temporal::MeterPoint const *);
        gint real_remove_bbt_marker (Temporal::MusicTimePoint const *);
 
        void edit_tempo_marker (TempoMarker&);
        void edit_meter_marker (MeterMarker&);
        void edit_bbt_marker (BBTMarker&);
        void edit_control_point (ArdourCanvas::Item*);
        void edit_region (RegionView*);
 
        void edit_current_meter ();
        void edit_current_tempo ();
 
        void marker_menu_edit ();
        void marker_menu_remove ();
        void marker_menu_rename ();
        void edit_marker (ArdourMarker* marker, bool with_scene);
        bool edit_location (ARDOUR::Location& loc, bool with_scene, bool with_command);
        void toggle_tempo_continues ();
        void toggle_tempo_type ();
        void ramp_to_next_tempo ();
        void toggle_marker_menu_lock ();
        void toggle_marker_section ();
        void marker_menu_hide ();
        void marker_menu_set_origin ();
        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 (bool force_regions);
        void marker_menu_range_to_next ();
        void marker_menu_change_cue (int cue);
        void marker_menu_zoom_to_range ();
        void new_transport_marker_menu_set_loop ();
        void new_transport_marker_menu_set_punch ();
        void update_loop_range_view ();
        void update_punch_range_view ();
        void new_transport_marker_menu_popdown ();
        void marker_context_menu (GdkEventButton*, ArdourCanvas::Item*);
        void tempo_map_marker_context_menu (GdkEventButton*, ArdourCanvas::Item*);
        void new_transport_marker_context_menu (GdkEventButton*, ArdourCanvas::Item*);
        void build_range_marker_menu (ARDOUR::Location*, bool, bool);
        void build_marker_menu (ARDOUR::Location*);
        void build_tempo_marker_menu (TempoMarker*, bool);
        void build_meter_marker_menu (MeterMarker*, bool);
        void build_bbt_marker_menu (BBTMarker*);
        void build_new_transport_marker_menu ();
 
        void dynamic_cast_marker_object (void*, MeterMarker**, TempoMarker**, BBTMarker**) const;
 
        Gtk::Menu* tempo_marker_menu;
        Gtk::Menu* meter_marker_menu;
        Gtk::Menu* bbt_marker_menu;
        Gtk::Menu* marker_menu;
        Gtk::Menu* range_marker_menu;
        Gtk::Menu* new_transport_marker_menu;
        ArdourCanvas::Item* marker_menu_item;
 
        typedef std::list<MetricMarker*> Marks;
        Marks tempo_marks;
        Marks meter_marks;
        Marks bbt_marks;
 
        void remove_metric_marks ();
        void reset_metric_marks ();
        void reset_tempo_marks ();
        void reset_meter_marks ();
        void reset_bbt_marks ();
 
        void compute_current_bbt_points (Temporal::TempoMapPoints& grid, samplepos_t left, samplepos_t right);
 
        void reassociate_metric_markers (Temporal::TempoMap::SharedPtr const &);
 
        void reassociate_tempo_marker (Temporal::TempoMap::SharedPtr const & tmap, Temporal::Tempos const &, TempoMarker& marker);
        void reassociate_meter_marker (Temporal::TempoMap::SharedPtr const & tmap, Temporal::Meters const &, MeterMarker& marker);
        void reassociate_bartime_marker (Temporal::TempoMap::SharedPtr const & tmap, Temporal::MusicTimes const &, BBTMarker& marker);
 
        void make_bbt_marker (Temporal::MusicTimePoint const *, Marks::iterator before);
        void make_meter_marker (Temporal::MeterPoint const *, Marks::iterator before);
        void make_tempo_marker (Temporal::TempoPoint const * ts, Temporal::TempoPoint const *& prev_ts, uint32_t tc_color, samplecnt_t sr3, Marks::iterator before);
        void update_tempo_curves (double min_tempo, double max_tempo, samplecnt_t sr);
 
        void tempo_map_changed ();
 
        void redisplay_grid (bool immediate_redraw);
 
        /* toolbar */
 
        ArdourWidgets::ArdourButton   tav_expand_button;
        ArdourWidgets::ArdourButton   tav_shrink_button;
        ArdourWidgets::ArdourDropdown visible_tracks_selector;
        ArdourWidgets::ArdourDropdown zoom_preset_selector;
 
        int32_t                   _visible_track_count;
        void build_track_count_menu ();
        void set_visible_track_count (int32_t);
 
        void set_zoom_preset(int64_t);
 
        Gtk::VBox                toolbar_clock_vbox;
        Gtk::VBox                toolbar_selection_clock_vbox;
        Gtk::Table               toolbar_selection_clock_table;
        Gtk::Label               toolbar_selection_cursor_label;
 
        ArdourWidgets::ArdourButton smart_mode_button;
        Glib::RefPtr<Gtk::ToggleAction> smart_mode_action;
 
        void                     mouse_mode_chosen (Editing::MouseMode m);
        void                     mouse_mode_object_range_toggled ();
        bool                     ignore_mouse_mode_toggle;
 
        bool                     mouse_select_button_release (GdkEventButton*);
 
        Gtk::VBox                automation_box;
        Gtk::Button              automation_mode_button;
 
        //edit mode menu stuff
        ArdourWidgets::ArdourDropdown ripple_mode_selector;
        ArdourWidgets::ArdourDropdown   edit_mode_selector;
        void edit_mode_selection_done (ARDOUR::EditMode);
        void ripple_mode_selection_done (ARDOUR::RippleMode);
        void build_edit_mode_menu ();
        Gtk::VBox edit_mode_box;
 
        void set_ripple_mode (ARDOUR::RippleMode);
 
        void set_edit_mode (ARDOUR::EditMode);
        void cycle_edit_mode ();
 
 
        Gtk::CheckButton stretch_marker_cb;
 
        bool should_stretch_markers() const {
                return stretch_marker_cb.get_active ();
        }
 
        Gtk::HBox ebox_hpacker;
        Gtk::VBox ebox_vpacker;
 
        Gtk::HBox _box;
 
        //zoom focus menu stuff
        Editing::ZoomFocus effective_zoom_focus() const;
 
        void build_zoom_focus_menu ();
 
        /* Marker Click Radio */
        Glib::RefPtr<Gtk::RadioAction> marker_click_behavior_action (Editing::MarkerClickBehavior);
        void marker_click_behavior_chosen (Editing::MarkerClickBehavior);
        void marker_click_behavior_selection_done (Editing::MarkerClickBehavior);
 
        Gtk::HBox _track_box;
 
        Gtk::HBox _zoom_box;
        void zoom_adjustment_changed();
 
        void setup_toolbar ();
 
        void setup_tooltips ();
 
        Gtk::HBox toolbar_hbox;
 
        void setup_midi_toolbar ();
 
        void time_selection_changed ();
        void track_selection_changed ();
        void update_time_selection_display ();
        void presentation_info_changed (PBD::PropertyChange const &);
        void handle_gui_changes (std::string const&, void*);
        void region_selection_changed ();
        void catch_up_on_midi_selection ();
        sigc::connection editor_regions_selection_changed_connection;
        void sensitize_all_region_actions (bool);
        void sensitize_the_right_region_actions (bool because_canvas_crossing);
        bool _all_region_actions_sensitized;
        bool _ignore_region_action;
        bool _last_region_menu_was_main;
        void point_selection_changed ();
        void marker_selection_changed ();
 
        bool _track_selection_change_without_scroll;
        bool _editor_track_selection_change_without_scroll;
 
        void cancel_selection ();
        void cancel_time_selection ();
 
        bool get_smart_mode() const;
 
        bool audio_region_selection_covers (samplepos_t where);
 
        SectionBox* _section_box;
 
        /* transport range select process */
 
        ArdourCanvas::Rectangle* range_bar_drag_rect;
        ArdourCanvas::Rectangle* transport_bar_preroll_rect;
        ArdourCanvas::Rectangle* transport_bar_postroll_rect;
        ArdourCanvas::Rectangle* transport_loop_range_rect;
        ArdourCanvas::Rectangle* transport_punch_range_rect;
        ArdourCanvas::Line*      transport_punchin_line;
        ArdourCanvas::Line*      transport_punchout_line;
        ArdourCanvas::Rectangle* transport_preroll_rect;
        ArdourCanvas::Rectangle* transport_postroll_rect;
 
        ARDOUR::Location* transport_punch_location();
 
        ARDOUR::Location* temp_location;
 
        /* object rubberband select process */
 
        void select_all_within (Temporal::timepos_t const &, Temporal::timepos_t const &, double, double, std::list<SelectableOwner*> const &, ARDOUR::SelectionOperation, bool);
 
        EditorRouteGroups* _route_groups;
        EditorRoutes*      _routes;
        EditorRegions*     _regions;
        EditorSections*    _sections;
        EditorSources*     _sources;
        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;
 
        /* autoscrolling */
 
        bool autoscroll_canvas ();
        void start_canvas_autoscroll (bool allow_horiz, bool allow_vert, const ArdourCanvas::Rect& boundary);
        void stop_canvas_autoscroll ();
 
        /* trimming */
        void point_trim (GdkEvent*, Temporal::timepos_t const &);
 
        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 */
        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);
 
        /* audio export */
 
        bool _no_not_select_reimported_tracks;
 
        enum BounceTarget {
                NewSource,
                NewTrigger,
                ReplaceRange
        };
 
        int  write_region_selection(RegionSelection&);
        bool write_region (std::string path, std::shared_ptr<ARDOUR::AudioRegion>);
        void bounce_region_selection (bool with_processing);
        void bounce_range_selection (BounceTarget, 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::TimelineRange>&);
 
        void write_selection ();
 
        uint32_t selection_op_cmd_depth;
        uint32_t selection_op_history_it;
 
        std::list<XMLNode*> selection_op_history; /* used in *_reversible_selection_op */
 
        void update_title ();
        void update_title_s (const std::string & snapshot_name);
 
        void instant_save ();
        bool no_save_instant;
 
        std::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_range (bool with_dialog);
        void duplicate_regions (float times);
 
        TimeFXDialog* current_timefx;
        static void* timefx_thread (void* arg);
        void do_timefx (bool fixed_end);
 
        int time_stretch (RegionSelection&, Temporal::ratio_t const & fraction, bool fixed_end);
        int pitch_shift (RegionSelection&, float cents);
        void pitch_shift_region ();
 
        /* editor-mixer strip */
 
        MixerStrip *current_mixer_strip;
        bool show_editor_mixer_when_tracks_arrive;
        Gtk::VBox current_mixer_strip_vbox;
        void cms_new (std::shared_ptr<ARDOUR::Route>);
        void current_mixer_strip_hidden ();
 
#ifdef __APPLE__
        void ensure_all_elements_drawn ();
#endif
        /* nudging tracks */
 
        void nudge_track (bool use_edit_point, bool forwards);
 
        static const int32_t default_width = 995;
        static const int32_t default_height = 765;
 
        /* nudge */
 
        ArdourWidgets::ArdourButton      nudge_forward_button;
        ArdourWidgets::ArdourButton      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);
 
        /* plugin setup */
        int plugin_setup (std::shared_ptr<ARDOUR::Route>, std::shared_ptr<ARDOUR::PluginInsert>, ARDOUR::Route::PluginSetupOptions);
 
        /* handling cleanup */
 
        int playlist_deletion_dialog (std::shared_ptr<ARDOUR::Playlist>);
 
        PBD::ScopedConnectionList session_connections;
        PBD::ScopedConnection tempo_map_connection;
 
        /* tracking step changes of track height */
 
        TimeAxisView* current_stepping_trackview;
        PBD::microseconds_t last_track_height_step_timestamp;
        gint track_height_step_timeout();
        sigc::connection step_timeout;
 
        bool left_track_canvas (GdkEventCrossing*);
        bool entered_track_canvas (GdkEventCrossing*);
        void set_entered_track (TimeAxisView*);
        void set_entered_regionview (RegionView*);
        gint left_automation_track ();
 
        std::pair<Temporal::timepos_t,Temporal::timepos_t> max_zoom_extent() const { return session_gui_extents(); }
 
        void reset_canvas_action_sensitivity (bool);
        void set_gain_envelope_visibility ();
        void set_region_gain_visibility (RegionView*);
        void toggle_gain_envelope_active ();
        void toggle_region_polarity ();
        void reset_region_gain_envelopes ();
 
        void session_state_saved (std::string);
 
        Glib::RefPtr<Gtk::Action>              selection_undo_action;
        Glib::RefPtr<Gtk::Action>              selection_redo_action;
 
        Glib::RefPtr<Gtk::ToggleAction> show_editor_mixer_action;
        Glib::RefPtr<Gtk::ToggleAction> show_editor_list_action;
        Glib::RefPtr<Gtk::ToggleAction> show_editor_props_action;
        Glib::RefPtr<Gtk::ToggleAction> show_touched_automation_action;
 
        void history_changed ();
 
        Editing::EditPoint _edit_point;
 
        ArdourWidgets::ArdourDropdown edit_point_selector;
        void build_edit_point_menu();
 
        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 (Editing::EditPoint);
        void edit_point_chosen (Editing::EditPoint);
        Glib::RefPtr<Gtk::RadioAction> edit_point_action (Editing::EditPoint);
        std::vector<std::string> edit_point_strings;
        std::vector<std::string> edit_mode_strings;
        std::vector<std::string> ripple_mode_strings;
 
        void selected_marker_moved (ARDOUR::Location*);
 
        bool get_edit_op_range (Temporal::timepos_t& start, Temporal::timepos_t& end) const;
 
        void get_regions_at (RegionSelection&, Temporal::timepos_t const & where, const TrackViewList& ts) const;
        void get_regions_after (RegionSelection&, Temporal::timepos_t const & where, const TrackViewList& ts) const;
 
        RegionSelection get_regions_from_selection_and_edit_point (Editing::EditIgnoreOption = Editing::EDIT_IGNORE_NONE,
                                                                   bool use_context_click = false,
                                                                   bool from_outside_canvas = false);
        RegionSelection get_regions_from_selection_and_entered () const;
 
        void start_updating_meters ();
        void stop_updating_meters ();
        bool meters_running;
 
        void select_next_stripable (bool routes_only = true);
        void select_prev_stripable (bool routes_only = true);
 
        Temporal::timepos_t snap_to_minsec (Temporal::timepos_t const & start,
                                            Temporal::RoundMode   direction,
                                            ARDOUR::SnapPref    gpref) const;
 
        Temporal::timepos_t snap_to_cd_frames (Temporal::timepos_t const & start,
                                               Temporal::RoundMode   direction,
                                               ARDOUR::SnapPref    gpref) const;
 
        Temporal::timepos_t snap_to_timecode (Temporal::timepos_t const & start,
                                              Temporal::RoundMode   direction,
                                              ARDOUR::SnapPref    gpref) const;
 
        Temporal::timepos_t snap_to_grid (Temporal::timepos_t const & start,
                                          Temporal::RoundMode   direction,
                                          ARDOUR::SnapPref    gpref) const;
 
        void snap_to_internal (Temporal::timepos_t & first,
                               Temporal::RoundMode   direction = Temporal::RoundNearest,
                               ARDOUR::SnapPref     gpref = ARDOUR::SnapToAny_Visual,
                               bool                for_mark  = false) const;
 
        Temporal::timepos_t snap_to_marker (Temporal::timepos_t const & presnap,
                                            Temporal::RoundMode direction = Temporal::RoundNearest) const;
 
        double visible_canvas_width() const { return _visible_canvas_width; }
 
        RhythmFerret* rhythm_ferret;
 
        void fit_tracks (TrackViewList &);
        void fit_selection ();
        void set_track_height (Height);
 
        void _remove_tracks ();
        bool idle_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 ();
 
        bool _pending_locate_request;
 
        bool _pending_initial_locate;
 
        Gtk::HBox _summary_hbox;
        EditorSummary* _summary;
 
        void region_view_added (RegionView*);
        void region_view_removed ();
 
        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 ();
 
        TimeAxisView* _last_cut_copy_source_track;
 
        bool _region_selection_change_updates_region_list;
 
        void setup_fade_images ();
        std::map<ARDOUR::FadeShape, Gtk::Image*> _xfade_in_images;
        std::map<ARDOUR::FadeShape, Gtk::Image*> _xfade_out_images;
 
        Gtk::MenuItem& action_menu_item (std::string const &);
        void action_pre_activated (Glib::RefPtr<Gtk::Action> const &);
 
        void follow_mixer_selection ();
        bool _following_mixer_selection;
 
        /* RTAV Automation display option */
        void toggle_show_touched_automation ();
        void set_show_touched_automation (bool);
 
        int time_fx (ARDOUR::RegionList&, Temporal::ratio_t ratio, bool pitching, bool fixed_end);
        void toggle_sound_midi_notes ();
 
        bool _control_point_toggled_on_press;
 
        TimeAxisView* _stepping_axis_view;
        void zoom_vertical_modifier_released();
 
        void bring_in_callback (Gtk::Label*, uint32_t n, uint32_t total, std::string name);
        void update_bring_in_message (Gtk::Label* label, uint32_t n, uint32_t total, std::string name);
        void bring_all_sources_into_session ();
 
        MainMenuDisabler* _main_menu_disabler;
 
        /* private helper functions to help with registering region actions */
 
        Glib::RefPtr<Gtk::Action> register_region_action (Glib::RefPtr<Gtk::ActionGroup> group, Editing::RegionActionTarget, char const* name, char const* label, sigc::slot<void> slot);
        void register_toggle_region_action (Glib::RefPtr<Gtk::ActionGroup> group, Editing::RegionActionTarget, char const* name, char const* label, sigc::slot<void> slot);
 
        void remove_gap_marker_callback (Temporal::timepos_t at, Temporal::timecnt_t distance);
 
        Editing::GridType determine_mapping_grid_snap (Temporal::timepos_t t);
        void choose_mapping_drag (ArdourCanvas::Item*, GdkEvent*);
 
        template<typename T>
        Temporal::TimeDomain drag_time_domain (T* thing_with_time_domain) {
                return thing_with_time_domain ? thing_with_time_domain->time_domain() : Temporal::AudioTime;
        }
 
        template<typename T>
        Temporal::TimeDomain drag_time_domain (std::shared_ptr<T> thing_with_time_domain) {
                return thing_with_time_domain ? thing_with_time_domain->time_domain() : Temporal::AudioTime;
        }
 
        void clear_tempo_markers_before (Temporal::timepos_t where, bool stop_at_music_times);
        void clear_tempo_markers_after (Temporal::timepos_t where, bool stop_at_music_times);
        void clear_tempo_markers () {
                clear_tempo_markers_after (Temporal::timepos_t (0), false);
        }
 
        Temporal::DomainBounceInfo* domain_bounce_info;
 
        friend class Drag;
        friend class RegionCutDrag;
        friend class RegionDrag;
 
        struct TrackDrag {
                RouteTimeAxisView* track;
                GdkCursor*         drag_cursor;
                GdkCursor*         predrag_cursor;
                TimeAxisView*      bump_track;
                double             start;
                double             current;
                double             previous;
                bool               have_predrag_cursor;
                int                direction;
                bool               first_move;
                bool               did_reorder;
 
                TrackDrag (RouteTimeAxisView* rtav, ARDOUR::Session& s)
                        : track (rtav)
                        , drag_cursor (nullptr)
                        , predrag_cursor (nullptr)
                        , bump_track (nullptr)
                        , start (-1.)
                        , current (0.)
                        , previous (0.)
                        , have_predrag_cursor (false)
                        , direction (0)
                        , first_move (true)
                        , did_reorder (false)
                {}
 
        };
        TrackDrag* track_drag;
 
        MarkerBarType _visible_marker_types;
        RangeBarType _visible_range_types;
        void update_mark_and_range_visibility ();
        void show_marker_type (MarkerBarType);
        void show_range_type (RangeBarType);
        PBD::Signal<void()> VisibleMarkersChanged;
        PBD::Signal<void()> VisibleRangesChanged;
 
        friend class RegionMoveDrag;
        friend class TrimDrag;
        friend class MappingTwistDrag;
        friend class MappingEndDrag;
        friend class MeterMarkerDrag;
        friend class BBTMarkerDrag;
        friend class TempoMarkerDrag;
        friend class TempoCurveDrag;
        friend class TempoTwistDrag;
        friend class TempoEndDrag;
        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 SelectionDrag;
        friend class RangeMarkerBarDrag;
        friend class MouseZoomDrag;
        friend class RegionCreateDrag;
        friend class RegionMotionDrag;
        friend class RegionInsertDrag;
        friend class VideoTimeLineDrag;
 
        friend class EditorSummary;
        friend class EditorGroupTabs;
 
        friend class EditorRoutes;
        friend class RhythmFerret;
};