midi_view.h

Go to the documentation of this file.

/*
 * Copyright (C) 2006-2015 David Robillard <d@drobilla.net>
 * Copyright (C) 2008-2012 Hans Baier <hansfbaier@googlemail.com>
 * Copyright (C) 2008-2017 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2009-2012 Carl Hetherington <carl@carlh.net>
 * Copyright (C) 2015-2016 Tim Mayberry <mojofunk@gmail.com>
 * Copyright (C) 2015-2017 Nick Mainsbridge <mainsbridge@gmail.com>
 * Copyright (C) 2015-2017 Robin Gareus <robin@gareus.org>
 *
 * 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 <string>
#include <vector>
#include <stdint.h>
 
#include <unordered_map>
 
#include <sigc++/signal.h>
 
#include "pbd/signals.h"
 
#include "ardour/midi_model.h"
#include "ardour/types.h"
 
#include "canvas/rectangle.h"
 
#include "editing.h"
#include "region_view.h"
#include "midi_view_background.h"
#include "time_axis_view_item.h"
#include "editor_automation_line.h"
#include "enums.h"
#include "line_merger.h"
 
namespace ARDOUR {
        class MidiRegion;
        class MidiModel;
        class MidiTrack;
        class Filter;
};
 
namespace MIDI {
        namespace Name {
                struct PatchPrimaryKey;
        };
};
 
class SysEx;
class Note;
class Hit;
class MidiTimeAxisView;
class NoteBase;
class GhostRegion;
class AutomationTimeAxisView;
class AutomationRegionView;
class MidiCutBuffer;
class MidiListEditor;
class EditNoteDialog;
class PatchChange;
class ItemCounts;
class CursorContext;
class VelocityGhostRegion;
class EditingContext;
class PasteContext;
class Drag;
 
class StartBoundaryRect : public ArdourCanvas::Rectangle
{
  public:
        StartBoundaryRect (ArdourCanvas::Item* p) : ArdourCanvas::Rectangle (p) {}
 
        void render (ArdourCanvas::Rect const & area, Cairo::RefPtr<Cairo::Context> context) const;
        bool covers (ArdourCanvas::Duple const& point) const;
        void compute_bounding_box () const;
};
 
class EndBoundaryRect : public ArdourCanvas::Rectangle
{
  public:
        EndBoundaryRect (ArdourCanvas::Item* p) : ArdourCanvas::Rectangle (p) {}
 
        void render (ArdourCanvas::Rect const & area, Cairo::RefPtr<Cairo::Context> context) const;
        bool covers (ArdourCanvas::Duple const& point) const;
        void compute_bounding_box () const;
};
 
class MidiView : public virtual sigc::trackable, public LineMerger
{
  public:
        typedef Evoral::Note<Temporal::Beats> NoteType;
        typedef Evoral::Sequence<Temporal::Beats>::Notes Notes;
 
        MidiView (std::shared_ptr<ARDOUR::MidiTrack> mt,
                  ArdourCanvas::Item&      parent,
                  EditingContext&          ec,
                  MidiViewBackground&      bg,
                  uint32_t                 basic_color);
        MidiView (MidiView const & other);
 
        virtual ~MidiView ();
 
        void init (bool wfd);
 
        virtual void set_samples_per_pixel (double) {};
 
        virtual bool display_is_enabled() const { return true; }
 
        virtual ArdourCanvas::Item* drag_group() const = 0;
 
        void step_add_note (uint8_t channel, uint8_t number, uint8_t velocity,
                            Temporal::Beats pos, Temporal::Beats len);
        void step_sustain (Temporal::Beats beats);
        virtual void set_height (double);
        void apply_note_range(uint8_t lowest, uint8_t highest, bool force=false);
 
        // inline ARDOUR::ColorMode color_mode() const { return _background->color_mode(); }
 
        virtual uint32_t get_fill_color() const;
        void color_handler ();
 
        void show_step_edit_cursor (Temporal::Beats pos);
        void move_step_edit_cursor (Temporal::Beats pos);
        void hide_step_edit_cursor ();
        void set_step_edit_cursor_width (Temporal::Beats beats);
 
        virtual GhostRegion* add_ghost (TimeAxisView&) { return nullptr; }
        virtual std::string get_modifier_name() const;
 
        virtual void set_region (std::shared_ptr<ARDOUR::MidiRegion>);
        virtual void set_track (std::shared_ptr<ARDOUR::MidiTrack>);
        virtual void set_model (std::shared_ptr<ARDOUR::MidiModel>);
 
        void set_show_source (bool yn);
        bool show_source () const { return _show_source; }
 
        NoteBase* add_note(const std::shared_ptr<NoteType> note, bool visible);
 
        void cut_copy_clear (Editing::CutCopyOp);
        bool paste (Temporal::timepos_t const & pos, const ::Selection& selection, PasteContext& ctx);
        void paste_internal (Temporal::timepos_t const & pos, unsigned paste_count, float times, const MidiCutBuffer&);
 
        void add_canvas_patch_change (ARDOUR::MidiModel::PatchChangePtr patch);
        void remove_canvas_patch_change (PatchChange* pc);
 
        void get_patch_key_at (Temporal::Beats time, uint8_t channel, MIDI::Name::PatchPrimaryKey& key) const;
 
        MIDI::Name::PatchPrimaryKey patch_change_to_patch_key (ARDOUR::MidiModel::PatchChangePtr);
 
        void change_patch_change (PatchChange& old_patch, const MIDI::Name::PatchPrimaryKey& new_patch);
        void change_patch_change (ARDOUR::MidiModel::PatchChangePtr, Evoral::PatchChange<Temporal::Beats> const &);
 
        void add_patch_change (Temporal::timecnt_t const &, Evoral::PatchChange<Temporal::Beats> const &);
        void move_patch_change (PatchChange &, Temporal::Beats);
        void delete_patch_change (PatchChange *);
        void edit_patch_change (PatchChange *);
 
        void delete_sysex (SysEx*);
 
        void step_patch (PatchChange& patch, bool bank, int delta);
 
        void display_patch_changes();
 
        void display_sysexes();
 
        void begin_write ();
        void end_write ();
        void extend_active_notes ();
        void extend_active_notes (Temporal::timecnt_t const &);
 
        virtual void begin_drag_edit (std::string const & why);
        void end_drag_edit ();
 
        void display_model(std::shared_ptr<ARDOUR::MidiModel> model);
        std::shared_ptr<ARDOUR::MidiModel> model() const { return _model; }
 
        /* note_diff commands should start here; this initiates an undo record */
        void start_note_diff_command (std::string name = "midi edit");
 
        void note_diff_add_change (NoteBase* ev, ARDOUR::MidiModel::NoteDiffCommand::Property, uint8_t val);
        void note_diff_add_change (NoteBase* ev, ARDOUR::MidiModel::NoteDiffCommand::Property, Temporal::Beats val);
        void note_diff_add_note (const std::shared_ptr<NoteType> note, bool selected, bool show_velocity = false);
        void note_diff_remove_note (NoteBase* ev);
 
        /* note_diff commands should be completed with one of these calls; they may (or may not) commit the undo record */
        void apply_note_diff (bool as_subcommand = false, bool was_copy = false);
        void abort_note_diff();
 
        void   note_entered(NoteBase* ev);
        void   note_left(NoteBase* ev);
        void   patch_entered (PatchChange *);
        void   patch_left (PatchChange *);
        void   sysex_entered (SysEx* p);
        void   sysex_left (SysEx* p);
        void   note_mouse_position (float xfraction, float yfraction, bool can_set_cursor=true);
        void   unique_select(NoteBase* ev);
        void   note_selected(NoteBase* ev, bool add, bool extend=false);
        void   note_deselected(NoteBase* ev);
        void   delete_selection();
        void   delete_note (std::shared_ptr<NoteType>);
        size_t selection_size() { return _selection.size(); }
        void   select_all_notes ();
        void   select_range(Temporal::timepos_t const & start, Temporal::timepos_t const & end);
        void   invert_selection ();
        void   extend_selection ();
        void   duplicate_selection ();
 
        Temporal::Beats earliest_in_selection ();
        void move_selection(Temporal::timecnt_t const & dx, double dy, double cumulative_dy);
        void note_dropped (NoteBase* ev, Temporal::timecnt_t const & d_qn, int8_t d_note, bool copy);
        NoteBase* copy_selection (NoteBase* primary);
        void move_copies(Temporal::timecnt_t const & dx_qn, double dy, double cumulative_dy);
 
        void select_notes (std::list<Evoral::event_id_t>, bool allow_audition);
        void select_matching_notes (uint8_t notenum, uint16_t channel_mask, bool add, bool extend);
        void toggle_matching_notes (uint8_t notenum, uint16_t channel_mask);
 
        virtual bool note_in_region_range(const std::shared_ptr<NoteType> note, bool& visible) const;
        /* Test if a note is within this region's time range. Return true if so */
        virtual bool note_in_region_time_range(const std::shared_ptr<NoteType> note) const;
 
        double get_position_pixels();
 
        double get_end_position_pixels();
 
        void begin_resizing(bool at_front);
 
        void update_resizing (NoteBase* primary, bool at_front, double delta_x, bool relative, double snap_delta, bool with_snap);
        void finish_resizing (NoteBase* primary, bool at_front, double delat_x, bool relative, double snap_delta, bool with_snap);
        void abort_resizing ();
 
        struct NoteResizeData {
                ::Note                  *note;
                ArdourCanvas::Rectangle *resize_rect;
        };
 
        /* Convert a position to a distance (origin+position) relative to the
         * start of this MidiView.
         *
         * What this is relative to will depend on whether or not _show_source
         * is true.
         */
 
        Temporal::timecnt_t view_position_to_model_position (Temporal::timepos_t const & p) const;
 
        Temporal::timepos_t source_beats_to_timeline (Temporal::Beats const &) const;
 
        Temporal::timepos_t start() const;
 
        double snap_to_pixel(double x, bool ensure_snap = false);
 
        Temporal::timecnt_t snap_pixel_to_time (double x, bool ensure_snap = false);
 
        void goto_previous_note (bool add_to_selection);
        void goto_next_note (bool add_to_selection);
        void change_note_lengths (bool, bool, Temporal::Beats beats, bool start, bool end);
        void change_velocities (bool up, bool fine, bool allow_smush, bool all_together);
        void set_velocity (NoteBase* primary, int velocity);
        bool set_velocity_for_notes (std::vector<NoteBase*>& notes, int velocity);
        bool set_velocities_for_notes (std::vector<NoteBase*>& notes, std::vector<int>& velocities);
        void transpose (bool up, bool fine, bool allow_smush);
        void nudge_notes (bool forward, bool fine);
        void channel_edit ();
        void velocity_edit ();
 
        void show_list_editor ();
 
        void set_note_range (uint8_t low, uint8_t high);
        void maybe_set_note_range (uint8_t low, uint8_t high);
        virtual void set_visibility_note_range (MidiViewBackground::VisibleNoteRange, bool);
 
        typedef std::set<NoteBase*> Selection;
        Selection const & selection () const {
                return _selection;
        }
 
        void selection_as_notelist (Notes& selected, bool allow_all_if_none_selected = false);
 
        void set_channel_selector_scoped_note(NoteBase* note){ _channel_selection_scoped_note = note; }
        NoteBase* channel_selector_scoped_note(){  return _channel_selection_scoped_note; }
 
        void create_note_at (Temporal::timepos_t const & t, double y, Temporal::Beats length, uint32_t state, bool shift_snap);
 
        void clear_selection ();
 
        void note_deleted (NoteBase*);
        void clear_note_selection ();
 
        void shift_midi (Temporal::timepos_t const &, bool model);
 
        void show_verbose_cursor_for_new_note_value(std::shared_ptr<NoteType> current_note, uint8_t new_note) const;
 
        std::shared_ptr<ARDOUR::MidiTrack>  midi_track() const { return _midi_track; }
        std::shared_ptr<ARDOUR::MidiRegion> midi_region() const { return _midi_region; }
        EditingContext& editing_context() const { return _editing_context; }
        MidiViewBackground& midi_context() const { return _midi_context; }
 
        void clip_data_recorded (samplecnt_t);
 
        virtual void select_self (bool add) {}
        virtual void unselect_self () {}
        void select_self () { select_self (false); }
        virtual void select_self_uniquely () {}
 
        void show_start (bool yn);
        void show_end (bool yn);
 
        virtual bool midi_canvas_group_event(GdkEvent* ev);
 
        int visible_channel() const { return _visible_channel; }
        void set_visible_channel (int, bool clear_selection = true);
        PBD::Signal<void()> VisibleChannelChanged;
 
  protected:
        void init (std::shared_ptr<ARDOUR::MidiTrack>);
        virtual void region_resized (const PBD::PropertyChange&);
 
        void set_flags (XMLNode *);
        void store_flags ();
 
        virtual void reset_width_dependent_items (double pixel_width);
 
        void redisplay (bool view_only);
        bool note_editable (NoteBase const *) const;
 
  protected:
        friend class EditingContext;
        friend class Editor; // grr, C++ does not allow inheritance of friendship
 
        void invert_note_selection ();
        void extend_note_selection ();
 
        void move_note_starts_earlier_fine () { change_note_lengths (true, false, Temporal::Beats(), true, false); }
        void move_note_starts_earlier () { change_note_lengths (false, false, Temporal::Beats(), true, false); }
        void move_note_ends_later_fine () { change_note_lengths (true, false, Temporal::Beats(), false, true); }
        void move_note_ends_later () { change_note_lengths (false, false, Temporal::Beats(), false, true); }
        void move_note_starts_later_fine () { change_note_lengths (true, true, Temporal::Beats(), true, false); }
        void move_note_starts_later () { change_note_lengths (false, true, Temporal::Beats(), true, false); }
        void move_note_ends_earlier_fine () { change_note_lengths (true, true, Temporal::Beats(), false, true); }
        void move_note_ends_earlier () { change_note_lengths (false, true, Temporal::Beats(), false, true); }
 
        void select_next_note () { goto_next_note (false); }
        void select_previous_note () { goto_previous_note (false); }
        void add_select_next_note () { goto_next_note (true); }
        void add_select_previous_note () { goto_previous_note (true); }
 
        void increase_note_velocity ()                     { change_velocities (true, false, false, false); }
        void increase_note_velocity_fine ()                { change_velocities (true, true, false, false); }
        void increase_note_velocity_smush ()               { change_velocities (true, false, true, false); }
        void increase_note_velocity_together ()            { change_velocities (true, false, false, true); }
        void increase_note_velocity_fine_smush ()          { change_velocities (true, true, true, false); }
        void increase_note_velocity_fine_together ()       { change_velocities (true, true, false, true); }
        void increase_note_velocity_smush_together ()      { change_velocities (true, false, true, true); }
        void increase_note_velocity_fine_smush_together () { change_velocities (true, true, true, true); }
 
        void decrease_note_velocity ()                     { change_velocities (false, false, false, false); }
        void decrease_note_velocity_fine ()                { change_velocities (false, true, false, false); }
        void decrease_note_velocity_smush ()               { change_velocities (false, false, true, false); }
        void decrease_note_velocity_together ()            { change_velocities (false, false, false, true); }
        void decrease_note_velocity_fine_smush ()          { change_velocities (false, true, true, false); }
        void decrease_note_velocity_fine_together ()       { change_velocities (false, true, false, true); }
        void decrease_note_velocity_smush_together ()      { change_velocities (false, false, true, true); }
        void decrease_note_velocity_fine_smush_together () { change_velocities (false, true, true, true); }
 
        void transpose_up_octave () { transpose (true, false, false); }
        void transpose_up_octave_smush () { transpose (true, false, true); }
        void transpose_up_tone () { transpose (true, true, false); }
        void transpose_up_tone_smush () { transpose (true, true, true); }
 
        void transpose_down_octave () { transpose (false, false, false); }
        void transpose_down_octave_smush () { transpose (false, false, true); }
        void transpose_down_tone () { transpose (false, true, false); }
        void transpose_down_tone_smush () { transpose (false, true, true); }
 
        void nudge_notes_later () { nudge_notes (true, false); }
        void nudge_notes_later_fine () { nudge_notes (true, true); }
        void nudge_notes_earlier () { nudge_notes (false, false); }
        void nudge_notes_earlier_fine () { nudge_notes (false, true); }
 
        void quantize_selected_notes ();
 
  protected:
        friend class MidiRubberbandSelectDrag;
        friend class MidiVerticalSelectDrag;
        friend class NoteDrag;
        friend class NoteCreateDrag;
        friend class HitCreateDrag;
        friend class MidiGhostRegion;
 
        friend class EditNoteDialog;
 
        void play_midi_note (std::shared_ptr<NoteType> note);
        void start_playing_midi_note (std::shared_ptr<NoteType> note);
        void start_playing_midi_chord (std::vector<std::shared_ptr<NoteType> > notes);
 
        void clear_selection_internal ();
 
        void clear_events ();
        virtual void clear_ghost_events() {}
        virtual void ghosts_model_changed() {}
        virtual void ghosts_view_changed() {}
        virtual void ghost_remove_note (NoteBase*) {}
        virtual void ghost_add_note (NoteBase*) {}
        virtual void ghost_sync_selection (NoteBase*) {}
 
        bool note_canvas_event(GdkEvent* ev);
 
        PBD::ScopedConnectionList connections_requiring_model;
        PBD::ScopedConnection track_going_away_connection;
        PBD::ScopedConnectionList region_connections;
        void track_going_away ();
        void region_going_away ();
 
        void midi_channel_mode_changed ();
        void instrument_settings_changed ();
 
        void change_note_channel (NoteBase *, int8_t, bool relative=false);
        void change_note_velocity(NoteBase* ev, int8_t vel, bool relative=false);
        uint8_t change_note_note(NoteBase* ev, int8_t note, bool relative=false);
        void change_note_time(NoteBase* ev, ARDOUR::MidiModel::TimeType, bool relative=false);
        void change_note_length (NoteBase *, ARDOUR::MidiModel::TimeType);
        void trim_note(NoteBase* ev, ARDOUR::MidiModel::TimeType start_delta,
                       ARDOUR::MidiModel::TimeType end_delta);
 
        void update_drag_selection (Temporal::timepos_t const & start, Temporal::timepos_t const & end, double y0, double y1, bool extend);
        void update_vertical_drag_selection (double last_y, double y, bool extend);
 
        void add_to_selection (NoteBase*);
        void remove_from_selection (NoteBase*);
 
        std::string get_note_name (std::shared_ptr<NoteType> note, uint8_t note_value) const;
 
        void show_verbose_cursor (std::string const &, double, double) const;
        void show_verbose_cursor (std::shared_ptr<NoteType>) const;
 
        uint8_t get_velocity_for_add (ARDOUR::MidiModel::TimeType time) const;
        uint8_t get_channel_for_add (ARDOUR::MidiModel::TimeType time) const;
 
        typedef std::unordered_map<std::shared_ptr<NoteType>, NoteBase*>                             Events;
        typedef std::unordered_map<ARDOUR::MidiModel::PatchChangePtr, std::shared_ptr<PatchChange> > PatchChanges;
        typedef std::unordered_map<ARDOUR::MidiModel::constSysExPtr, std::shared_ptr<SysEx> >        SysExes;
        typedef std::vector<NoteBase*> CopyDragEvents;
 
        std::shared_ptr<ARDOUR::MidiTrack>   _midi_track;
        EditingContext&                      _editing_context;
        MidiViewBackground&                  _midi_context;
        std::shared_ptr<ARDOUR::MidiModel>   _model;
        std::shared_ptr<ARDOUR::MidiRegion>  _midi_region;
        Events                               _events;
        CopyDragEvents                       _copy_drag_events;
        PatchChanges                         _patch_changes;
        SysExes                              _sys_exes;
        Note**                               _active_notes;
        Temporal::timecnt_t                   active_note_end;
        ArdourCanvas::Container*             _note_group;
        ARDOUR::MidiModel::NoteDiffCommand*  _note_diff_command;
        NoteBase*                            _ghost_note;
        double                               _last_ghost_x;
        double                               _last_ghost_y;
        ArdourCanvas::Rectangle*             _step_edit_cursor;
        Temporal::Beats                      _step_edit_cursor_width;
        Temporal::Beats                      _step_edit_cursor_position;
        NoteBase*                            _channel_selection_scoped_note;
        StartBoundaryRect*                   _start_boundary_rect;
        EndBoundaryRect*                     _end_boundary_rect;
        bool                                 _show_source;
        Drag*                                 selection_drag;
        Drag*                                 draw_drag;
        int                                  _visible_channel;
 
        Selection _selection;
 
        MidiCutBuffer* selection_as_cut_buffer () const;
 
        std::set< std::shared_ptr<NoteType> > _marked_for_selection;
 
        std::set<Evoral::event_id_t> _pending_note_selection;
 
        std::set< std::shared_ptr<NoteType> > _marked_for_velocity;
 
        std::vector<NoteResizeData *> _resize_data;
 
        NoteBase* find_canvas_note (std::shared_ptr<NoteType>);
        NoteBase* find_canvas_note (Evoral::event_id_t id);
        Events::iterator _optimization_iterator;
 
        std::shared_ptr<PatchChange> find_canvas_patch_change (ARDOUR::MidiModel::PatchChangePtr p);
        std::shared_ptr<SysEx> find_canvas_sys_ex (ARDOUR::MidiModel::SysExPtr s);
 
        friend class VelocityDisplay;
        void sync_velocity_drag (double factor);
 
        void update_note (NoteBase*);
        virtual void update_sustained (Note *);
        virtual void update_hit (Hit *);
 
        void create_ghost_note (double, double, uint32_t state);
        void update_ghost_note (double, double, uint32_t state);
 
        MidiListEditor* _list_editor;
        bool _no_sound_notes;
 
        void snap_changed ();
 
        virtual bool motion (GdkEventMotion*);
        virtual bool scroll (GdkEventScroll*);
        virtual bool key_press (GdkEventKey*);
        virtual bool key_release (GdkEventKey*);
        virtual bool button_press (GdkEventButton*);
        virtual bool button_release (GdkEventButton*);
        virtual bool enter_notify (GdkEventCrossing*);
        virtual bool leave_notify (GdkEventCrossing*);
 
        void drop_down_keys ();
        void maybe_select_by_position (GdkEventButton* ev, double x, double y);
        void get_events (Events& e, Evoral::Sequence<Temporal::Beats>::NoteOperator op, uint8_t val, int chan_mask = 0);
 
        void display_patch_changes_on_channel (uint8_t, bool);
 
        void data_recorded (std::weak_ptr<ARDOUR::MidiSource>);
 
        Temporal::Beats get_grid_beats(Temporal::timepos_t const & pos) const;
 
        Temporal::Beats get_draw_length_beats(Temporal::timepos_t const & pos) const;
 
        void remove_ghost_note ();
        virtual void mouse_mode_changed ();
        virtual void enter_internal (uint32_t state);
        virtual void leave_internal ();
        void hide_verbose_cursor ();
 
        samplecnt_t _last_display_zoom;
 
        double    _last_event_x;
        double    _last_event_y;
        bool      _entered;
        NoteBase* _entered_note;
        bool      _select_all_notes_after_add;
 
        bool _mouse_changed_selection;
 
        Gtkmm2ext::Color _patch_change_outline;
        Gtkmm2ext::Color _patch_change_fill;
 
        ARDOUR::ChannelMode get_channel_mode() const;
        uint16_t get_selected_channels () const;
 
        virtual double height() const;
 
        virtual double contents_height() const { return height() - 2; }
        inline double note_height() const { return contents_height() / _midi_context.contents_note_range(); }
 
        double note_to_y (uint8_t note) const { return _midi_context.note_to_y (note); }
        uint8_t y_to_note (double y) const { return _midi_context.y_to_note (y); }
 
        void update_patch_changes ();
        void update_sysexes ();
        void view_changed ();
        void model_changed ();
        void note_mode_changed ();
 
        void sync_ghost_selection (NoteBase*);
 
        struct SplitInfo {
                Temporal::Beats time;
                Temporal::Beats base_len;
                int             note;
                int             channel;
                int             velocity;
                int             off_velocity;
 
                SplitInfo (Temporal::Beats const & t, Temporal::Beats const & l, int n, int c, int v, int ov)
                        : time (t)
                        , base_len (l)
                        , note (n)
                        , channel (c)
                        , velocity (v)
                        , off_velocity (ov) {}
        };
        std::vector<SplitInfo> split_info;
        bool in_note_split;
 
        uint32_t split_tuple;
        bool     note_splitting;
        bool    _extensible; /* if true, we can add data beyond the current region/source end */
 
        bool extensible() const { return _extensible; }
        void set_extensible (bool yn) { _extensible = yn; }
 
        void start_note_splitting ();
        void end_note_splitting ();
 
        void split_notes_grid ();
        void split_notes_more ();
        void split_notes_less ();
        void join_notes ();
        void join_notes_on_channel (int channel);
 
        void add_split_notes ();
        void region_update_sustained (Note *, double&, double&, double&, double&);
        void clip_capture_update_sustained (Note *, double&, double&, double&, double&);
 
        void size_start_rect ();
        void size_end_rect ();
        bool start_boundary_event (GdkEvent*);
        bool end_boundary_event (GdkEvent*);
 
        virtual void add_control_points_to_selection (Temporal::timepos_t const &, Temporal::timepos_t const &, double y0, double y1) {}
 
        void color_note (NoteBase*, int channel);
};