livetrax/gtk2_ardour/midi_list_editor.cc

/*
 * Copyright (C) 2009-2015 David Robillard <d@drobilla.net>
 * Copyright (C) 2009-2017 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2014-2023 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.
 */

#include <cmath>
#include <map>

#include <gtkmm/cellrenderercombo.h>

#include "evoral/Note.h"
#include "evoral/midi_util.h"

#include "ardour/midi_model.h"
#include "ardour/midi_region.h"
#include "ardour/midi_source.h"
#include "ardour/session.h"
#include "ardour/tempo.h"

#include "gtkmm2ext/actions.h"
#include "gtkmm2ext/gui_thread.h"
#include "gtkmm2ext/keyboard.h"

#include "midi_list_editor.h"
#include "note_player.h"
#include "ui_config.h"

#include "pbd/i18n.h"

using namespace std;
using namespace Gtk;
using namespace Gtkmm2ext;
using namespace Glib;
using namespace ARDOUR;
using Temporal::BBT_Time;

static map<int32_t, std::string> note_length_map;

static void
fill_note_length_map ()
{
	note_length_map.insert (make_pair<int32_t, string> (Temporal::ticks_per_beat * 4,     _("Whole")));
	note_length_map.insert (make_pair<int32_t, string> (Temporal::ticks_per_beat * 2,     _("Half")));
	note_length_map.insert (make_pair<int32_t, string> (Temporal::ticks_per_beat * 2 / 3, _("Triplet")));
	note_length_map.insert (make_pair<int32_t, string> (Temporal::ticks_per_beat / 1,     _("Quarter")));
	note_length_map.insert (make_pair<int32_t, string> (Temporal::ticks_per_beat / 2,     _("Eighth")));
	note_length_map.insert (make_pair<int32_t, string> (Temporal::ticks_per_beat / 4,     _("Sixteenth")));
	note_length_map.insert (make_pair<int32_t, string> (Temporal::ticks_per_beat / 8,     _("Thirty-second")));
	note_length_map.insert (make_pair<int32_t, string> (Temporal::ticks_per_beat / 16,    _("Sixty-fourth")));
}

MidiListEditor::MidiListEditor (Session* s, std::shared_ptr<MidiRegion> r, std::shared_ptr<MidiTrack> tr)
	: ArdourWindow (r->name ())
	, buttons (1, 1)
	, region (r)
	, track (tr)
{
	if (note_length_map.empty ()) {
		fill_note_length_map ();
	}

	/* We do not handle nested sources/regions. Caller should have tackled this */

	if (r->max_source_level () > 0) {
		throw failed_constructor ();
	}

	set_session (s);

	edit_column      = -1;
	editing_renderer = 0;
	editing_editable = 0;

	model = ListStore::create (columns);
	view.set_model (model);

	note_length_model = ListStore::create (note_length_columns);
	TreeModel::Row row;

	for (std::map<int, string>::iterator i = note_length_map.begin (); i != note_length_map.end (); ++i) {
		row                            = *(note_length_model->append ());
		row[note_length_columns.ticks] = i->first;
		row[note_length_columns.name]  = i->second;
	}

	view.signal_key_press_event ().connect (sigc::mem_fun (*this, &MidiListEditor::key_press), false);
	view.signal_key_release_event ().connect (sigc::mem_fun (*this, &MidiListEditor::key_release), false);
	view.signal_scroll_event ().connect (sigc::mem_fun (*this, &MidiListEditor::scroll_event), false);

	view.append_column (_("Start"), columns.start);
	view.append_column (_("Channel"), columns.channel);
	view.append_column (_("Num"), columns.note);
	view.append_column (_("Name"), columns.note_name);
	view.append_column (_("Vel"), columns.velocity);

	/* use a combo renderer for length, so that we can offer a selection
	 * of pre-defined note lengths. we still allow edited values with
	 * arbitrary length (in ticks).
	 */

	Gtk::TreeViewColumn*    lenCol    = Gtk::manage (new Gtk::TreeViewColumn (_("Length")));
	Gtk::CellRendererCombo* comboCell = Gtk::manage (new Gtk::CellRendererCombo);
	lenCol->pack_start (*comboCell);
	lenCol->add_attribute (comboCell->property_text (), columns.length);

	comboCell->property_model ()       = note_length_model;
	comboCell->property_text_column () = 1;
	comboCell->property_has_entry ()   = false;

	view.append_column (*lenCol);

	view.set_headers_visible (true);
	view.set_rules_hint (true);
	view.get_selection ()->set_mode (SELECTION_MULTIPLE);
	view.get_selection ()->signal_changed ().connect (sigc::mem_fun (*this, &MidiListEditor::selection_changed));

	/* Editing the first column (BBT) as text is currently not supported
	 * -> use editable AudioClock, implement parse_as_bbt */
	for (int i = 1; i < 6; ++i) {
		CellRendererText* renderer = dynamic_cast<CellRendererText*> (view.get_column_cell_renderer (i));

		TreeViewColumn* col = view.get_column (i);
		col->set_data (X_("colnum"), GUINT_TO_POINTER (i));

		renderer->property_editable () = true;

		renderer->signal_editing_started ().connect (sigc::bind (sigc::mem_fun (*this, &MidiListEditor::editing_started), i));
		renderer->signal_editing_canceled ().connect (sigc::mem_fun (*this, &MidiListEditor::editing_canceled));
		renderer->signal_edited ().connect (sigc::mem_fun (*this, &MidiListEditor::edited));
	}

	scroller.add (view);
	scroller.set_policy (POLICY_NEVER, POLICY_AUTOMATIC);

	redisplay_model ();

	region->midi_source (0)->model ()->ContentsChanged.connect (content_connections, invalidator (*this),
	                                                            boost::bind (&MidiListEditor::redisplay_model, this), gui_context ());
	region->PropertyChanged.connect (content_connections, invalidator (*this),
	                                 boost::bind (&MidiListEditor::redisplay_model, this), gui_context ());

	buttons.attach (sound_notes_button, 0, 1, 0, 1);
	Glib::RefPtr<Gtk::Action> act = ActionManager::get_action ("Editor", "sound-midi-notes");
	if (act) {
		gtk_activatable_set_related_action (GTK_ACTIVATABLE (sound_notes_button.gobj ()), act->gobj ());
	}

	view.show ();
	scroller.show ();
	buttons.show ();
	vbox.show ();
	sound_notes_button.show ();

	vbox.set_spacing (6);
	vbox.set_border_width (6);
	vbox.pack_start (buttons, false, false);
	vbox.pack_start (scroller, true, true);

	add (vbox);
	set_size_request (-1, 400);
}

MidiListEditor::~MidiListEditor ()
{
}

bool
MidiListEditor::scroll_event (GdkEventScroll* ev)
{
	TreeModel::Path path;
	TreeViewColumn* col;
	int             cellx;
	int             celly;
	int             idelta = 0;
	Temporal::Beats beat_delta;
	bool            apply        = false;
	bool            was_selected = false;
	char const*     opname;

	MidiModel::NoteDiffCommand::Property prop (MidiModel::NoteDiffCommand::NoteNumber);

	if (!view.get_path_at_pos (ev->x, ev->y, path, col, cellx, celly)) {
		return false;
	}

	if (view.get_selection ()->count_selected_rows () == 0) {
		was_selected = false;
	} else if (view.get_selection ()->is_selected (path)) {
		was_selected = true;
	} else {
		was_selected = false;
	}

	int colnum = GPOINTER_TO_UINT (col->get_data (X_("colnum")));

	switch (colnum) {
		case 0:
			/* This is dangerous. Changing position with the mouse-wheel can reorder
			 * notes. The mouse-position does not change and then affect different notes.
			 */
			if (Keyboard::modifier_state_equals (ev->state, Keyboard::GainFineScaleModifier)) {
				beat_delta = Temporal::Beats::ticks (Temporal::ticks_per_beat / 64);
			} else {
				beat_delta = Temporal::Beats (1, 0);
			}
			if (ev->direction == GDK_SCROLL_DOWN || ev->direction == GDK_SCROLL_LEFT) {
				beat_delta = -beat_delta;
			}
			prop   = MidiModel::NoteDiffCommand::StartTime;
			opname = _("edit note start");
			apply  = true;
			break;
		case 1:
			idelta = 1;
			if (ev->direction == GDK_SCROLL_DOWN || ev->direction == GDK_SCROLL_LEFT) {
				idelta = -idelta;
			}
			prop   = MidiModel::NoteDiffCommand::Channel;
			opname = _("edit note channel");
			apply  = true;
			break;
		case 2:
		case 3:
			idelta = 1;
			if (ev->direction == GDK_SCROLL_DOWN || ev->direction == GDK_SCROLL_LEFT) {
				idelta = -idelta;
			}
			prop   = MidiModel::NoteDiffCommand::NoteNumber;
			opname = _("edit note number");
			apply  = true;
			break;

		case 4:
			idelta = 1;
			if (ev->direction == GDK_SCROLL_DOWN || ev->direction == GDK_SCROLL_LEFT) {
				idelta = -idelta;
			}
			prop   = MidiModel::NoteDiffCommand::Velocity;
			opname = _("edit note velocity");
			apply  = true;
			break;

		case 5:
			if (Keyboard::modifier_state_equals (ev->state, Keyboard::GainFineScaleModifier)) {
				beat_delta = Temporal::Beats::ticks (Temporal::ticks_per_beat / 64);
			} else {
				beat_delta = Temporal::Beats (1, 0);
			}
			if (ev->direction == GDK_SCROLL_DOWN || ev->direction == GDK_SCROLL_LEFT) {
				beat_delta = -beat_delta;
			}
			prop   = MidiModel::NoteDiffCommand::Length;
			opname = _("edit note length");
			apply  = true;
			break;

		default:
			break;
	}

	if (apply) {
		std::shared_ptr<MidiModel>  m (region->midi_source (0)->model ());
		MidiModel::NoteDiffCommand* cmd = m->new_note_diff_command (opname);
		vector<TreeModel::Path>     previous_selection;

		if (was_selected) {
			/* use selection */

			TreeView::Selection::ListHandle_Path rows = view.get_selection ()->get_selected_rows ();
			TreeModel::iterator                  iter;
			std::shared_ptr<NoteType>            note;

			for (TreeView::Selection::ListHandle_Path::iterator i = rows.begin (); i != rows.end (); ++i) {
				previous_selection.push_back (*i);

				if ((iter = model->get_iter (*i))) {
					note = (*iter)[columns._note];

					switch (prop) {
						case MidiModel::NoteDiffCommand::StartTime:
							if (note->time () + beat_delta >= Temporal::Beats ()) {
								cmd->change (note, prop, note->time () + beat_delta);
							} else {
								cmd->change (note, prop, Temporal::Beats ());
							}
							break;
						case MidiModel::NoteDiffCommand::Velocity:
							cmd->change (note, prop, (uint8_t) (note->velocity () + idelta));
							break;
						case MidiModel::NoteDiffCommand::Length:
							if (note->length () <= Temporal::Beats::one_tick () && beat_delta.to_ticks () > 0) {
								/* Special case increments starting at 1 tick.
								 * Next step up after 1 is 1920 (not 1921) - or fine grained 30 (not 31).
								 */
								cmd->change (note, prop, beat_delta);
							} else if (note->length () + beat_delta >= Temporal::Beats::one_tick ()) {
								cmd->change (note, prop, note->length () + beat_delta);
							} else {
								cmd->change (note, prop, Temporal::Beats::one_tick ());
							}
							break;
						case MidiModel::NoteDiffCommand::Channel:
							cmd->change (note, prop, (uint8_t) (note->channel () + idelta));
							break;
						case MidiModel::NoteDiffCommand::NoteNumber:
							cmd->change (note, prop, (uint8_t) (note->note () + idelta));
							break;
						default:
							continue;
					}
				}
			}

		} else {
			/* just this row */

			TreeModel::iterator iter;
			iter = model->get_iter (path);

			previous_selection.push_back (path);

			if (iter) {
				std::shared_ptr<NoteType> note = (*iter)[columns._note];

				switch (prop) {
					case MidiModel::NoteDiffCommand::StartTime:
						if (note->time () + beat_delta >= Temporal::Beats ()) {
							cmd->change (note, prop, note->time () + beat_delta);
						} else {
							cmd->change (note, prop, Temporal::Beats ());
						}
						break;
					case MidiModel::NoteDiffCommand::Velocity:
						cmd->change (note, prop, (uint8_t) (note->velocity () + idelta));
						break;
					case MidiModel::NoteDiffCommand::Length:
						if (note->length () + beat_delta >= Temporal::Beats::one_tick ()) {
							cmd->change (note, prop, note->length () + beat_delta);
						} else {
							cmd->change (note, prop, Temporal::Beats::one_tick ());
						}
						break;
					case MidiModel::NoteDiffCommand::Channel:
						cmd->change (note, prop, (uint8_t) (note->channel () + idelta));
						break;
					case MidiModel::NoteDiffCommand::NoteNumber:
						cmd->change (note, prop, (uint8_t) (note->note () + idelta));
						break;
					default:
						break;
				}
			}
		}

		m->apply_diff_command_as_commit (*_session, cmd);

		/* reset selection to be as it was before we rebuilt */

		for (vector<TreeModel::Path>::iterator i = previous_selection.begin (); i != previous_selection.end (); ++i) {
			view.get_selection ()->select (*i);
		}
	}

	return true;
}

bool
MidiListEditor::key_press (GdkEventKey* ev)
{
	bool            ret = false;
	TreeModel::Path path;
	TreeViewColumn* col;
	int             colnum;

	switch (ev->keyval) {
		case GDK_Tab:
			if (edit_column > 0) {
				colnum = edit_column;
				path   = edit_path;
				if (editing_editable) {
					editing_editable->editing_done ();
				}
				if (colnum >= 5) {
					/* wrap to next line */
					/* XXX never reached. Editing Length shows a dropdown menu,
					 * which returns edit focus to the dialog.
					 */
					colnum = 0;
					path.next ();
				} else {
					colnum++;
				}
				if (!path.empty ()) {
					col = view.get_column (colnum);
					view.set_cursor (path, *col, true);
				}
				ret = true;
			}
			break;

		case GDK_Up:
		case GDK_uparrow:
			if (edit_column > 0) {
				colnum = edit_column;
				path   = edit_path;
				if (editing_editable) {
					editing_editable->editing_done ();
				}
				path.prev ();
				if (!path.empty ()) {
					col = view.get_column (colnum);
					view.set_cursor (path, *col, true);
				}
				ret = true;
			}
			break;

		case GDK_Down:
		case GDK_downarrow:
			if (edit_column > 0) {
				colnum = edit_column;
				path   = edit_path;
				if (editing_editable) {
					editing_editable->editing_done ();
				}
				path.next ();
				if (!path.empty ()) {
					col = view.get_column (colnum);
					view.set_cursor (path, *col, true);
				}
				ret = true;
			}
			break;

		case GDK_Escape:
			stop_editing (true);
			break;
	}

	return ret;
}

bool
MidiListEditor::key_release (GdkEventKey* ev)
{
	bool                        ret = false;
	TreeModel::Path             path;
	TreeViewColumn*             col;
	TreeModel::iterator         iter;
	MidiModel::NoteDiffCommand* cmd;
	std::shared_ptr<MidiModel>  m (region->midi_source (0)->model ());
	std::shared_ptr<NoteType>   note;
	std::shared_ptr<NoteType>   copy;

	switch (ev->keyval) {
		case GDK_Insert:
			/* add a new note to the model, based on the note at the cursor pos */
			view.get_cursor (path, col);
			iter = model->get_iter (path);
			cmd  = m->new_note_diff_command (_("insert new note"));
			if (iter) {
				note = (*iter)[columns._note];
				copy.reset (new NoteType (*note.get ()));
			} else {
				Temporal::Beats pos = Temporal::TempoMap::use ()->quarters_at_sample (region->start ().samples ());
				copy.reset (new NoteType (0, pos, Temporal::Beats (1, 0), 60, 100));
			}
			cmd->add (copy);
			m->apply_diff_command_as_commit (*_session, cmd);
			/* model has been redisplayed by now */
			path.next ();
			if (!path.empty ()) {
				/* select, start editing column 2 (note) */
				col = view.get_column (2);
				view.set_cursor (path, *col, true);
			}
			break;

		case GDK_Delete:
		case GDK_BackSpace:
			if (edit_column < 0) {
				delete_selected_note ();
			}
			ret = true;
			break;

		case GDK_z:
			if (_session && Gtkmm2ext::Keyboard::modifier_state_contains (ev->state, Gtkmm2ext::Keyboard::PrimaryModifier)) {
				_session->undo (1);
				ret = true;
			}
			break;

		case GDK_r:
			if (_session && Gtkmm2ext::Keyboard::modifier_state_contains (ev->state, Gtkmm2ext::Keyboard::PrimaryModifier)) {
				_session->redo (1);
				ret = true;
			}
			break;

		default:
			break;
	}

	return ret;
}

void
MidiListEditor::delete_selected_note ()
{
	Glib::RefPtr<TreeSelection>          selection = view.get_selection ();
	TreeView::Selection::ListHandle_Path rows      = selection->get_selected_rows ();

	if (rows.empty ()) {
		return;
	}

	typedef vector<std::shared_ptr<NoteType>> Notes;
	Notes                                     to_delete;

	for (TreeView::Selection::ListHandle_Path::iterator i = rows.begin (); i != rows.end (); ++i) {
		TreeIter iter;

		if ((iter = model->get_iter (*i))) {
			std::shared_ptr<NoteType> note = (*iter)[columns._note];
			to_delete.push_back (note);
		}
	}

	std::shared_ptr<MidiModel>  m (region->midi_source (0)->model ());
	MidiModel::NoteDiffCommand* cmd = m->new_note_diff_command (_("delete notes (from list)"));

	for (Notes::iterator i = to_delete.begin (); i != to_delete.end (); ++i) {
		cmd->remove (*i);
	}

	m->apply_diff_command_as_commit (*_session, cmd);
}

void
MidiListEditor::stop_editing (bool cancelled)
{
	if (!cancelled) {
		if (editing_editable) {
			editing_editable->editing_done ();
		}
	} else {
		if (editing_renderer) {
			editing_renderer->stop_editing (cancelled);
		}
	}
}

void
MidiListEditor::editing_started (CellEditable* ed, const string& path, int colno)
{
	edit_path        = TreePath (path);
	edit_column      = colno;
	editing_renderer = dynamic_cast<CellRendererText*> (view.get_column_cell_renderer (colno));
	editing_editable = ed;

	if (ed) {
		Gtk::Entry* e = dynamic_cast<Gtk::Entry*> (ed);
		if (e) {
			e->signal_key_press_event ().connect (sigc::mem_fun (*this, &MidiListEditor::key_press), false);
			e->signal_key_release_event ().connect (sigc::mem_fun (*this, &MidiListEditor::key_release), false);
		}
	}
}

void
MidiListEditor::editing_canceled ()
{
	edit_path.clear ();
	edit_column      = -1;
	editing_renderer = 0;
	editing_editable = 0;
}

void
MidiListEditor::edited (const std::string& path, const std::string& text)
{
	TreeModel::iterator iter = model->get_iter (path);

	if (!iter || text.empty ()) {
		return;
	}

	std::shared_ptr<NoteType>            note = (*iter)[columns._note];
	MidiModel::NoteDiffCommand::Property prop (MidiModel::NoteDiffCommand::NoteNumber);

	Temporal::Beats bval;
	int             ival;
	bool            apply  = false;
	int             idelta = 0;
	Temporal::Beats delta;
	char const*     opname;
	switch (edit_column) {
		case 0: // start
			break;
		case 1: // channel
			/* correct ival for zero-based counting after scan */
			if (sscanf (text.c_str (), "%d", &ival) == 1 && --ival != note->channel ()) {
				idelta = ival - note->channel ();
				prop   = MidiModel::NoteDiffCommand::Channel;
				opname = _("change note channel");
				apply  = true;
			}
			break;
		case 2: // note
			if (sscanf (text.c_str (), "%d", &ival) == 1 && ival != note->note ()) {
				idelta = ival - note->note ();
				prop   = MidiModel::NoteDiffCommand::NoteNumber;
				opname = _("change note number");
				apply  = true;
			}
			break;
		case 3: // name
			ival = ParameterDescriptor::midi_note_num (text);
			if (ival < 128) {
				idelta = ival - note->note ();
				prop   = MidiModel::NoteDiffCommand::NoteNumber;
				opname = _("change note number");
				apply  = true;
			}
			break;
		case 4: // velocity
			if (sscanf (text.c_str (), "%d", &ival) == 1 && ival != note->velocity ()) {
				idelta = ival - note->velocity ();
				prop   = MidiModel::NoteDiffCommand::Velocity;
				opname = _("change note velocity");
				apply  = true;
			}
			break;
		case 5: // length

			try {
				stringstream ss (text);
				ss >> bval;

			} catch (...) {
				/* assume its text from the combo. look for the map
				 * entry for the actual note ticks
				 */

				uint64_t                        len_ticks = note->length ().to_ticks ();
				std::map<int, string>::iterator x         = note_length_map.find (len_ticks);

				if (x == note_length_map.end ()) {
					/* tick length not in map - was
					 * displaying numeric value ... use new value
					 * from note length map, and convert to beats.
					 */

					for (x = note_length_map.begin (); x != note_length_map.end (); ++x) {
						if (x->second == text) {
							break;
						}
					}

					if (x != note_length_map.end ()) {
						bval = Temporal::Beats::ticks (x->first);
					}

				} else {
					bval = Temporal::Beats ();

					if (text != x->second) {
						/* get ticks for the newly selected
						 * note length
						 */

						for (x = note_length_map.begin (); x != note_length_map.end (); ++x) {
							if (x->second == text) {
								break;
							}
						}

						if (x != note_length_map.end ()) {
							/* convert to beats */
							bval = Temporal::Beats::ticks (x->first);
						}
					}
				}
			}

			if (bval) {
				delta  = bval - note->length ();
				prop   = MidiModel::NoteDiffCommand::Length;
				opname = _("change note length");
				apply  = true;
			}
			break;

		default:
			break;
	}

	if (apply) {
		std::shared_ptr<MidiModel>  m (region->midi_source (0)->model ());
		MidiModel::NoteDiffCommand* cmd = m->new_note_diff_command (opname);

		TreeView::Selection::ListHandle_Path rows = view.get_selection ()->get_selected_rows ();

		for (TreeView::Selection::ListHandle_Path::iterator i = rows.begin (); i != rows.end (); ++i) {
			if ((iter = model->get_iter (*i))) {
				note = (*iter)[columns._note];

				switch (prop) {
					case MidiModel::NoteDiffCommand::Velocity:
						cmd->change (note, prop, (uint8_t) (note->velocity () + idelta));
						break;
					case MidiModel::NoteDiffCommand::Length:
						cmd->change (note, prop, note->length () + delta);
						break;
					case MidiModel::NoteDiffCommand::Channel:
						cmd->change (note, prop, (uint8_t) (note->channel () + idelta));
						break;
					case MidiModel::NoteDiffCommand::NoteNumber:
						cmd->change (note, prop, (uint8_t) (note->note () + idelta));
						break;
					default:
						continue;
				}
			}
		}

		m->apply_diff_command_as_commit (*_session, cmd);

		/* model has been redisplayed by now */
		/* keep selected row(s), move cursor there, don't continue editing */

		TreeViewColumn* col = view.get_column (edit_column);
		view.set_cursor (edit_path, *col, 0);

		/* reset edit info, since we're done */

		edit_path.clear ();
		edit_column      = -1;
		editing_renderer = 0;
		editing_editable = 0;
	}
}

void
MidiListEditor::redisplay_model ()
{
	view.set_model (Glib::RefPtr<Gtk::ListStore> (0));
	model->clear ();

	if (_session) {
		std::shared_ptr<MidiModel> m (region->midi_source (0)->model ());
		TreeModel::Row             row;
		stringstream               ss;

		MidiModel::Notes::const_iterator i        = m->note_lower_bound (region->start ().beats ());
		Temporal::Beats                  end_time = (region->start () + region->length ()).beats ();

		for (; i != m->notes ().end () && (*i)->time () < end_time; ++i) {
			row                    = *(model->append ());
			row[columns.channel]   = (*i)->channel () + 1;
			row[columns.note_name] = ParameterDescriptor::midi_note_name ((*i)->note ());
			row[columns.note]      = (*i)->note ();
			row[columns.velocity]  = (*i)->velocity ();

			Temporal::BBT_Time bbt = Temporal::TempoMap::use ()->bbt_at ((region->position () + timepos_t ((*i)->time ())).earlier (region->start ()));

			ss.str ("");
			ss << bbt;
			row[columns.start] = ss.str ();

			bbt.bars                  = 0;
			const Temporal::Beats dur = (*i)->end_time () - (*i)->time ();
			bbt.beats                 = dur.get_beats ();
			bbt.ticks                 = dur.get_ticks ();

			uint64_t                        len_ticks = (*i)->length ().to_ticks ();
			std::map<int, string>::iterator x         = note_length_map.find (len_ticks);

			if (x != note_length_map.end ()) {
				row[columns.length] = x->second;
			} else {
				ss.str ("");
				ss << len_ticks;
				row[columns.length] = ss.str ();
			}

			row[columns._note] = (*i);
		}
	}

	view.set_model (model);
}

void
MidiListEditor::selection_changed ()
{
	if (!UIConfiguration::instance ().get_sound_midi_notes ()) {
		return;
	}

	TreeModel::Path                      path;
	TreeModel::iterator                  iter;
	std::shared_ptr<NoteType>            note;
	TreeView::Selection::ListHandle_Path rows = view.get_selection ()->get_selected_rows ();

	NotePlayer* player = new NotePlayer (track);

	for (TreeView::Selection::ListHandle_Path::iterator i = rows.begin (); i != rows.end (); ++i) {
		if ((iter = model->get_iter (*i))) {
			note = (*iter)[columns._note];
			player->add (note);
		}
	}

	player->play ();
}