livetrax/gtk2_ardour/midi_region_view.cc

/*
    Copyright (C) 2001-2007 Paul Davis
    Author: Dave Robillard

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

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

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

#include <cmath>
#include <cassert>
#include <algorithm>

#include <gtkmm.h>

#include <gtkmm2ext/gtk_ui.h>

#include <sigc++/signal.h>

#include <ardour/playlist.h>
#include <ardour/tempo.h>
#include <ardour/midi_region.h>
#include <ardour/midi_source.h>
#include <ardour/midi_diskstream.h>
#include <ardour/midi_model.h>
#include <ardour/midi_patch_manager.h>

#include <evoral/Parameter.hpp>
#include <evoral/Control.hpp>

#include "streamview.h"
#include "midi_region_view.h"
#include "midi_streamview.h"
#include "midi_time_axis.h"
#include "simpleline.h"
#include "canvas-hit.h"
#include "canvas-note.h"
#include "canvas-program-change.h"
#include "public_editor.h"
#include "ghostregion.h"
#include "midi_time_axis.h"
#include "automation_time_axis.h"
#include "automation_region_view.h"
#include "utils.h"
#include "midi_util.h"
#include "gui_thread.h"
#include "keyboard.h"

#include "i18n.h"

using namespace sigc;
using namespace ARDOUR;
using namespace PBD;
using namespace Editing;
using namespace ArdourCanvas;

MidiRegionView::MidiRegionView (ArdourCanvas::Group *parent, RouteTimeAxisView &tv, boost::shared_ptr<MidiRegion> r, double spu, Gdk::Color& basic_color)
	: RegionView (parent, tv, r, spu, basic_color)
	, _force_channel(-1)
	, _last_channel_selection(0xFFFF)
	, _default_note_length(0.0)
	, _current_range_min(0)
	, _current_range_max(0)
	, _model_name(string())
	, _custom_device_mode(string())
	, _active_notes(0)
	, _note_group(new ArdourCanvas::Group(*parent))
	, _delta_command(NULL)
	, _mouse_state(None)
	, _pressed_button(0)
{
	_note_group->raise_to_top();
}

MidiRegionView::MidiRegionView (ArdourCanvas::Group *parent, RouteTimeAxisView &tv, boost::shared_ptr<MidiRegion> r, double spu, Gdk::Color& basic_color, TimeAxisViewItem::Visibility visibility)
	: RegionView (parent, tv, r, spu, basic_color, false, visibility)
	, _force_channel(-1)
	, _last_channel_selection(0xFFFF)
	, _default_note_length(0.0)
	, _model_name(string())
	, _custom_device_mode(string())
	, _active_notes(0)
	, _note_group(new ArdourCanvas::Group(*parent))
	, _delta_command(NULL)
	, _mouse_state(None)
	, _pressed_button(0)
	
{
	_note_group->raise_to_top();
}


MidiRegionView::MidiRegionView (const MidiRegionView& other)
	: RegionView (other)
	, _force_channel(-1)
	, _last_channel_selection(0xFFFF)
	, _default_note_length(0.0)
	, _model_name(string())
	, _custom_device_mode(string())
	, _active_notes(0)
	, _note_group(new ArdourCanvas::Group(*get_canvas_group()))
	, _delta_command(NULL)
	, _mouse_state(None)
	, _pressed_button(0)
{
	Gdk::Color c;
	int r,g,b,a;

	UINT_TO_RGBA (other.fill_color, &r, &g, &b, &a);
	c.set_rgb_p (r/255.0, g/255.0, b/255.0);
	
	init (c, false);
}

MidiRegionView::MidiRegionView (const MidiRegionView& other, boost::shared_ptr<MidiRegion> other_region)
	: RegionView (other, boost::shared_ptr<Region> (other_region))
	, _force_channel(-1)
	, _last_channel_selection(0xFFFF)
	, _default_note_length(0.0)
	, _model_name(string())
	, _custom_device_mode(string())
	, _active_notes(0)
	, _note_group(new ArdourCanvas::Group(*get_canvas_group()))
	, _delta_command(NULL)
	, _mouse_state(None)
	, _pressed_button(0)
{
	Gdk::Color c;
	int r,g,b,a;

	UINT_TO_RGBA (other.fill_color, &r, &g, &b, &a);
	c.set_rgb_p (r/255.0, g/255.0, b/255.0);

	init (c, true);
}

void
MidiRegionView::init (Gdk::Color& basic_color, bool wfd)
{
	if (wfd) {
		midi_region()->midi_source(0)->load_model();
	}

	const Meter& m = trackview.session().tempo_map().meter_at(_region->position());
	const Tempo& t = trackview.session().tempo_map().tempo_at(_region->position());
	_default_note_length = m.frames_per_bar(t, trackview.session().frame_rate())
			/ m.beats_per_bar();

	_model = midi_region()->midi_source(0)->model();
	_enable_display = false;

	RegionView::init (basic_color, false);

	compute_colors (basic_color);

	set_height (trackview.current_height());

	region_muted ();
	region_sync_changed ();
	region_resized (BoundsChanged);
	region_locked ();
	
	reset_width_dependent_items (_pixel_width);
	//reset_width_dependent_items ((double) _region->length() / samples_per_unit);

	set_colors ();

	_enable_display = true;
	if (_model) {
		if (wfd) {
			redisplay_model();
		}
		_model->ContentsChanged.connect(sigc::mem_fun(this, &MidiRegionView::redisplay_model));
	}

	group->raise_to_top();
	group->signal_event().connect (mem_fun (this, &MidiRegionView::canvas_event), false);

	midi_view()->signal_channel_mode_changed().connect(
			mem_fun(this, &MidiRegionView::midi_channel_mode_changed));
	
	midi_view()->signal_midi_patch_settings_changed().connect(
			mem_fun(this, &MidiRegionView::midi_patch_settings_changed));
}

bool
MidiRegionView::canvas_event(GdkEvent* ev)
{
	static bool delete_mod = false;
	static Editing::MidiEditMode original_mode;

	static double drag_start_x, drag_start_y;
	static double last_x, last_y;
	double event_x, event_y;
	nframes64_t event_frame = 0;

	static ArdourCanvas::SimpleRect* drag_rect = NULL;

	if (trackview.editor().current_mouse_mode() != MouseNote)
		return false;

	// Mmmm, spaghetti

	switch (ev->type) {
	case GDK_KEY_PRESS:
		if (ev->key.keyval == GDK_Delete && !delete_mod) {
			delete_mod = true;
			original_mode = trackview.editor().current_midi_edit_mode();
			trackview.editor().set_midi_edit_mode(MidiEditErase);
			start_delta_command(_("erase notes"));
			_mouse_state = EraseTouchDragging;
			return true;
		} else if (ev->key.keyval == GDK_Shift_L || ev->key.keyval == GDK_Control_L) {
			_mouse_state = SelectTouchDragging;
			return true;
		} else if (ev->key.keyval == GDK_Escape) {
			clear_selection();
			_mouse_state = None;
		}
		return false;

	case GDK_KEY_RELEASE:
		if (ev->key.keyval == GDK_Delete) {
			if (_mouse_state == EraseTouchDragging) {
				delete_selection();
				apply_command();
			}
			if (delete_mod) {
				trackview.editor().set_midi_edit_mode(original_mode);
				_mouse_state = None;
				delete_mod = false;
			}
			return true;
		} else if (ev->key.keyval == GDK_Shift_L || ev->key.keyval == GDK_Control_L) {
			_mouse_state = None;
			return true;
		}
		return false;

	case GDK_BUTTON_PRESS:
		if (_mouse_state != SelectTouchDragging && 
			_mouse_state != EraseTouchDragging &&
			ev->button.button == 1) {
			_pressed_button = ev->button.button;
			_mouse_state = Pressed;
			return true;
		}
		_pressed_button = ev->button.button;
		return true;

	case GDK_2BUTTON_PRESS:
		return true;

	case GDK_ENTER_NOTIFY:
		/* FIXME: do this on switch to note tool, too, if the pointer is already in */
		Keyboard::magic_widget_grab_focus();
		group->grab_focus();
		break;

	case GDK_MOTION_NOTIFY:
		event_x = ev->motion.x;
		event_y = ev->motion.y;
		group->w2i(event_x, event_y);

		// convert event_x to global frame
		event_frame = trackview.editor().pixel_to_frame(event_x) + _region->position();
		trackview.editor().snap_to(event_frame);
		// convert event_frame back to local coordinates relative to position
		event_frame -= _region->position();

		switch (_mouse_state) {
		case Pressed: // Drag start

			// Select drag start
			if (_pressed_button == 1 && trackview.editor().current_midi_edit_mode() == MidiEditSelect) {
				group->grab(GDK_POINTER_MOTION_MASK | GDK_BUTTON_RELEASE_MASK,
						Gdk::Cursor(Gdk::FLEUR), ev->motion.time);
				last_x = event_x;
				last_y = event_y;
				drag_start_x = event_x;
				drag_start_y = event_y;

				drag_rect = new ArdourCanvas::SimpleRect(*group);
				drag_rect->property_x1() = event_x;
				drag_rect->property_y1() = event_y;
				drag_rect->property_x2() = event_x;
				drag_rect->property_y2() = event_y;
				drag_rect->property_outline_what() = 0xFF;
				drag_rect->property_outline_color_rgba()
					= ARDOUR_UI::config()->canvasvar_MidiSelectRectOutline.get();
				drag_rect->property_fill_color_rgba()
					= ARDOUR_UI::config()->canvasvar_MidiSelectRectFill.get();

				_mouse_state = SelectRectDragging;
				return true;

			// Add note drag start
			} else if (trackview.editor().current_midi_edit_mode() == MidiEditPencil) {
				group->grab(GDK_POINTER_MOTION_MASK | GDK_BUTTON_RELEASE_MASK,
						Gdk::Cursor(Gdk::FLEUR), ev->motion.time);
				last_x = event_x;
				last_y = event_y;
				drag_start_x = event_x;
				drag_start_y = event_y;

				drag_rect = new ArdourCanvas::SimpleRect(*group);
				drag_rect->property_x1() = trackview.editor().frame_to_pixel(event_frame);

				drag_rect->property_y1() = midi_stream_view()->note_to_y(midi_stream_view()->y_to_note(event_y));
				drag_rect->property_x2() = event_x;
				drag_rect->property_y2() = drag_rect->property_y1() + floor(midi_stream_view()->note_height());
				drag_rect->property_outline_what() = 0xFF;
				drag_rect->property_outline_color_rgba() = 0xFFFFFF99;

				drag_rect->property_fill_color_rgba() = 0xFFFFFF66;

				_mouse_state = AddDragging;
				return true;
			}

			return false;

		case SelectRectDragging: // Select drag motion
		case AddDragging: // Add note drag motion
			if (ev->motion.is_hint) {
				int t_x;
				int t_y;
				GdkModifierType state;
				gdk_window_get_pointer(ev->motion.window, &t_x, &t_y, &state);
				event_x = t_x;
				event_y = t_y;
			}

			if (_mouse_state == AddDragging)
				event_x = trackview.editor().frame_to_pixel(event_frame);

			if (drag_rect) {
				if (event_x > drag_start_x)
					drag_rect->property_x2() = event_x;
				else
					drag_rect->property_x1() = event_x;
			}

			if (drag_rect && _mouse_state == SelectRectDragging) {
				if (event_y > drag_start_y)
					drag_rect->property_y2() = event_y;
				else
					drag_rect->property_y1() = event_y;

				update_drag_selection(drag_start_x, event_x, drag_start_y, event_y);
			}

			last_x = event_x;
			last_y = event_y;

		case EraseTouchDragging:
		case SelectTouchDragging:
			return false;

		default:
			break;
		}
		break;

	case GDK_BUTTON_RELEASE:
		event_x = ev->motion.x;
		event_y = ev->motion.y;
		group->w2i(event_x, event_y);
		group->ungrab(ev->button.time);
		event_frame = trackview.editor().pixel_to_frame(event_x);

		if (_pressed_button != 1) {
			return false;
		}
			
		switch (_mouse_state) {
		case Pressed: // Clicked
			switch (trackview.editor().current_midi_edit_mode()) {
			case MidiEditSelect:
			case MidiEditResize:
				clear_selection();
				break;
			case MidiEditPencil:
				create_note_at(event_x, event_y, _default_note_length);
			default: break;
			}
			_mouse_state = None;
			break;
		case SelectRectDragging: // Select drag done
			_mouse_state = None;
			delete drag_rect;
			drag_rect = NULL;
			break;
		case AddDragging: // Add drag done
			_mouse_state = None;
			if (drag_rect->property_x2() > drag_rect->property_x1() + 2) {
				const double x      = drag_rect->property_x1();
				const double length = trackview.editor().pixel_to_frame(
				                        drag_rect->property_x2() - drag_rect->property_x1());
					
				create_note_at(x, drag_rect->property_y1(), length);
			}

			delete drag_rect;
			drag_rect = NULL;
		default: break;
		}

	default: break;
	}

	return false;
}


/** Add a note to the model, and the view, at a canvas (click) coordinate */
void
MidiRegionView::create_note_at(double x, double y, double length)
{
	MidiTimeAxisView* const mtv = dynamic_cast<MidiTimeAxisView*>(&trackview);
	MidiStreamView* const view = mtv->midi_view();

	double note = midi_stream_view()->y_to_note(y);

	assert(note >= 0.0);
	assert(note <= 127.0);

	nframes64_t new_note_time = trackview.editor().pixel_to_frame (x);
	assert(new_note_time >= 0);
	new_note_time += _region->start();

	/*
	const Meter& m = trackview.session().tempo_map().meter_at(new_note_time);
	const Tempo& t = trackview.session().tempo_map().tempo_at(new_note_time);
	double length = m.frames_per_bar(t, trackview.session().frame_rate()) / m.beats_per_bar();
	*/
	
	// we need to snap here again in nframes64_t in order to be sample accurate 
	// since note time is region-absolute but snap_to_frame expects position-relative
	// time we have to coordinate transform back and forth here.
	nframes64_t new_note_time_position_relative = new_note_time      - _region->start(); 
	new_note_time = snap_to_frame(new_note_time_position_relative) + _region->start();
	
	// we need to snap the length too to be sample accurate
	nframes64_t new_note_length = nframes_t(length);
	new_note_length = snap_to_frame(new_note_time_position_relative + new_note_length) + _region->start() 
	                    - new_note_time;

	const boost::shared_ptr<NoteType> new_note(new NoteType(
			0, new_note_time, new_note_length, (uint8_t)note, 0x40));
	view->update_note_range(new_note->note());

	MidiModel::DeltaCommand* cmd = _model->new_delta_command("add note");
	cmd->add(new_note);
	_model->apply_command(trackview.session(), cmd);
}


void
MidiRegionView::clear_events()
{
	clear_selection();

	MidiGhostRegion* gr;
	for (std::vector<GhostRegion*>::iterator g = ghosts.begin(); g != ghosts.end(); ++g) {
		if ((gr = dynamic_cast<MidiGhostRegion*>(*g)) != 0) {
			gr->clear_events();
		}
	}

	for (Events::iterator i = _events.begin(); i != _events.end(); ++i)
		delete *i;

	_events.clear();
	_pgm_changes.clear();
}


void
MidiRegionView::display_model(boost::shared_ptr<MidiModel> model)
{
	_model = model;

	if (_enable_display)
		redisplay_model();
}
	
	
void
MidiRegionView::start_delta_command(string name)
{
	if (!_delta_command)
		_delta_command = _model->new_delta_command(name);
}

void
MidiRegionView::command_add_note(const boost::shared_ptr<NoteType> note, bool selected)
{
	if (_delta_command)
		_delta_command->add(note);

	if (selected)
		_marked_for_selection.insert(note);
}

void
MidiRegionView::command_remove_note(ArdourCanvas::CanvasNoteEvent* ev)
{
	if (_delta_command && ev->note()) {
		_delta_command->remove(ev->note());
	}
}
	
void
MidiRegionView::apply_command()
{
	if (!_delta_command) {
		return;
	}

	// Mark all selected notes for selection when model reloads
	for (Selection::iterator i = _selection.begin(); i != _selection.end(); ++i) {
		_marked_for_selection.insert((*i)->note());
	}
	
	_model->apply_command(trackview.session(), _delta_command);
	_delta_command = NULL; 
	midi_view()->midi_track()->diskstream()->playlist_modified();

	_marked_for_selection.clear();
}
	

void
MidiRegionView::abort_command()
{
	delete _delta_command;
	_delta_command = NULL;
	clear_selection();
}


void
MidiRegionView::redisplay_model()
{
	// Don't redisplay the model if we're currently recording and displaying that
	if (_active_notes)
		return;

	if (_model) {

		clear_events();
		_model->read_lock();
		
		
		MidiModel::Notes notes = _model->notes();
		/*
		cerr << endl << _model->midi_source()->name() << " : redisplaying " << notes.size() << " notes:" << endl;
		for (MidiModel::Notes::iterator i = notes.begin(); i != notes.end(); ++i) {
			cerr << "NOTE  time: " << (*i)->time()
				 << "  pitch: " << int((*i)->note()) 
			     << "  length: " << (*i)->length() 
			     << "  end-time: " << (*i)->end_time() 
			     << "  velocity: " << int((*i)->velocity()) 
			     << endl;
		}
		*/
		
		for (size_t i = 0; i < _model->n_notes(); ++i) {
			add_note(_model->note_at(i));
		}
		
		find_and_insert_program_change_flags();

		// Is this necessary?
		/*for (Automatable::Controls::const_iterator i = _model->controls().begin();
				i != _model->controls().end(); ++i) {

			assert(i->second);

			boost::shared_ptr<AutomationTimeAxisView> at
				= midi_view()->automation_child(i->second->parameter());
			if (!at)
				continue;

			Gdk::Color col = midi_stream_view()->get_region_color();

			boost::shared_ptr<AutomationRegionView> arv;

			{
				Glib::Mutex::Lock list_lock (i->second->list()->lock());

				arv = boost::shared_ptr<AutomationRegionView>(
						new AutomationRegionView(at->canvas_display,
							*at.get(), _region, i->second->list(),
							midi_stream_view()->get_samples_per_unit(), col));
			}

			arv->set_duration(_region->length(), this);
			arv->init(col, true);

			_automation_children.insert(std::make_pair(i->second->parameter(), arv));
		}*/
		_model->read_unlock();

	} else {
		cerr << "MidiRegionView::redisplay_model called without a model" << endmsg;
	}
}

void
MidiRegionView::find_and_insert_program_change_flags()
{
	// Draw program change 'flags'
	for (Automatable::Controls::iterator control = _model->controls().begin();
			control != _model->controls().end(); ++control) {
		if (control->first.type() == MidiPgmChangeAutomation) {
			Glib::Mutex::Lock list_lock (control->second->list()->lock());

			uint8_t channel       = control->first.channel();
			
			for (AutomationList::const_iterator event = control->second->list()->begin();
					event != control->second->list()->end(); ++event) {
				double event_time     = (*event)->when;
				double program_number = floor((*event)->value + 0.5);

				//cerr << " got program change on channel " << int(channel) << " time: " << event_time << " number: " << program_number << endl;
				
				// find bank select msb and lsb for the program change				
				Evoral::Parameter bank_select_msb(MidiCCAutomation, channel, MIDI_CTL_MSB_BANK);
				boost::shared_ptr<Evoral::Control>  msb_control = _model->control(bank_select_msb);
				uint8_t msb = 0;
				if (msb_control != 0) {
					msb = uint8_t(floor(msb_control->get_float(true, event_time) + 0.5));
				}

				Evoral::Parameter bank_select_lsb(MidiCCAutomation, channel, MIDI_CTL_LSB_BANK);
				boost::shared_ptr<Evoral::Control>  lsb_control = _model->control(bank_select_lsb);
				uint8_t lsb = 0;
				if (lsb_control != 0) {
					lsb = uint8_t(floor(lsb_control->get_float(true, event_time) + 0.5));
				}
					
				//cerr << " got msb " << int(msb) << " and lsb " << int(lsb) << " thread_id: " << pthread_self() << endl;
					
				MIDI::Name::PatchPrimaryKey patch_key(msb, lsb, program_number);
				
				boost::shared_ptr<MIDI::Name::Patch> patch = 
					MIDI::Name::MidiPatchManager::instance().find_patch(
							_model_name,
							_custom_device_mode, 
							channel, 
							patch_key
					);
				
				ControlEvent program_change(nframes_t(event_time), uint8_t(program_number), channel);
				
				if (patch != 0) {
					//cerr << " got patch with name " << patch->name() << " number " << patch->number() << endl;
					add_pgm_change(program_change, patch->name());
				} else {
					char buf[4];
					snprintf(buf, 4, "%d", int(program_number));
					add_pgm_change(program_change, buf);
				}
			}
			break;
		} else if (control->first.type() == MidiCCAutomation) {
			//cerr << " found CC Automation of channel " << int(control->first.channel()) << " and id " << control->first.id() << endl;
		}
	}	
}


MidiRegionView::~MidiRegionView ()
{
	in_destructor = true;

	RegionViewGoingAway (this); /* EMIT_SIGNAL */

	if (_active_notes) {
		end_write();
	}

	_selection.clear();
	clear_events();
	delete _note_group;
	delete _delta_command;
}


void
MidiRegionView::region_resized (Change what_changed)
{
	RegionView::region_resized(what_changed);
	
	if (what_changed & ARDOUR::PositionChanged) {
		if (_enable_display)
			redisplay_model();
	} 
}

void
MidiRegionView::reset_width_dependent_items (double pixel_width)
{
	RegionView::reset_width_dependent_items(pixel_width);
	assert(_pixel_width == pixel_width);

	if (_enable_display)
		redisplay_model();
}

void
MidiRegionView::set_height (gdouble height)
{
	static const double FUDGE = 2;
	const double old_height = _height;
	RegionView::set_height(height);
	_height = height - FUDGE;
	
	apply_note_range(midi_stream_view()->lowest_note(),
	                 midi_stream_view()->highest_note(),
	                 height != old_height + FUDGE);
	
	if (name_text) {
		name_text->raise_to_top();
	}
}


/** Apply the current note range from the stream view
 * by repositioning/hiding notes as necessary
 */
void
MidiRegionView::apply_note_range (uint8_t min, uint8_t max, bool force)
{
	if (_enable_display) {
		if (!force && _current_range_min == min && _current_range_max == max) {
			return;
		}
		
		_current_range_min = min;
		_current_range_max = max;

		for (Events::const_iterator i = _events.begin(); i != _events.end(); ++i) {
			CanvasNoteEvent* event = *i;
			Item* item = dynamic_cast<Item*>(event);
			assert(item);
			if (event && event->note()) {
				if (event->note()->note() < _current_range_min || event->note()->note() > _current_range_max) {
					if (canvas_item_visible(item)) {
						item->hide();
					}
				} else {
					if (!canvas_item_visible(item)) {
						item->show();
					}

					event->hide_velocity();
					if (CanvasNote* note = dynamic_cast<CanvasNote*>(event)) {
						const double y1 = midi_stream_view()->note_to_y(event->note()->note());
						const double y2 = y1 + floor(midi_stream_view()->note_height());

						note->property_y1() = y1;
						note->property_y2() = y2;
					} else if (CanvasHit* hit = dynamic_cast<CanvasHit*>(event)) {
						double x = trackview.editor().frame_to_pixel((nframes64_t)
								event->note()->time() - _region->start());
						const double diamond_size = midi_stream_view()->note_height() / 2.0;
						double y = midi_stream_view()->note_to_y(event->note()->note()) 
						                 + ((diamond_size-2.0) / 4.0);
						
						hit->set_height(diamond_size);
						hit->move(x-hit->x1(), y-hit->y1());
						hit->show();
					}
					if (event->selected()) {
						event->show_velocity();
					}
				}
			}
		}

	}
}

GhostRegion*
MidiRegionView::add_ghost (TimeAxisView& tv)
{
	RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*>(&trackview);
	CanvasNote* note;
	assert(rtv);

	double unit_position = _region->position () / samples_per_unit;
	MidiTimeAxisView* mtv = dynamic_cast<MidiTimeAxisView*>(&tv);
	MidiGhostRegion* ghost;

	if (mtv && mtv->midi_view()) {
		/* if ghost is inserted into midi track, use a dedicated midi ghost canvas group.
		   this is because it's nice to have midi notes on top of the note lines and
		   audio waveforms under it.
		 */
		ghost = new MidiGhostRegion (*mtv->midi_view(), trackview, unit_position);
	}
	else {
		ghost = new MidiGhostRegion (tv, trackview, unit_position);
	}

	ghost->set_height ();
	ghost->set_duration (_region->length() / samples_per_unit);
	ghosts.push_back (ghost);

	for (Events::iterator i = _events.begin(); i != _events.end(); ++i) {
		if ((note = dynamic_cast<CanvasNote*>(*i)) != 0) {
			ghost->add_note(note);
		}
	}

	ghost->GoingAway.connect (mem_fun(*this, &MidiRegionView::remove_ghost));

	return ghost;
}


/** Begin tracking note state for successive calls to add_event
 */
void
MidiRegionView::begin_write()
{
	assert(!_active_notes);
	_active_notes = new CanvasNote*[128];
	for (unsigned i=0; i < 128; ++i) {
		_active_notes[i] = NULL;
	}
}


/** Destroy note state for add_event
 */
void
MidiRegionView::end_write()
{
	delete[] _active_notes;
	_active_notes = NULL;
	_marked_for_selection.clear();
}


/** Resolve an active MIDI note (while recording).
 */
void
MidiRegionView::resolve_note(uint8_t note, double end_time)
{
	if (midi_view()->note_mode() != Sustained)
		return;

	if (_active_notes && _active_notes[note]) {
		_active_notes[note]->property_x2() = trackview.editor().frame_to_pixel((nframes64_t)end_time);
		_active_notes[note]->property_outline_what() = (guint32) 0xF; // all edges
		_active_notes[note] = NULL;
	}
}


/** Extend active notes to rightmost edge of region (if length is changed)
 */
void
MidiRegionView::extend_active_notes()
{
	if (!_active_notes) {
		return;
	}

	for (unsigned i=0; i < 128; ++i) {
		if (_active_notes[i]) {
			_active_notes[i]->property_x2() = trackview.editor().frame_to_pixel(_region->length());
		}
	}
}

void 
MidiRegionView::play_midi_note(boost::shared_ptr<NoteType> note)
{
	if (!trackview.editor().sound_notes()) {
		return;
	}

	RouteUI* route_ui = dynamic_cast<RouteUI*> (&trackview);
	assert(route_ui);
	
	route_ui->midi_track()->write_immediate_event(note->on_event().size(), note->on_event().buffer());
	
	nframes_t note_length_ms = (note->off_event().time() - note->on_event().time())
			* (1000 / (double)route_ui->session().nominal_frame_rate());
	Glib::signal_timeout().connect(bind(mem_fun(this, &MidiRegionView::play_midi_note_off), note),
			note_length_ms, G_PRIORITY_DEFAULT);
}

bool
MidiRegionView::play_midi_note_off(boost::shared_ptr<NoteType> note)
{
	RouteUI* route_ui = dynamic_cast<RouteUI*> (&trackview);
	assert(route_ui);
	
	route_ui->midi_track()->write_immediate_event(note->off_event().size(), note->off_event().buffer());

	return false;
}


/** Add a MIDI note to the view (with length).
 *
 * If in sustained mode, notes with length 0 will be considered active
 * notes, and resolve_note should be called when the corresponding note off
 * event arrives, to properly display the note.
 */
void
MidiRegionView::add_note(const boost::shared_ptr<NoteType> note)
{
	assert(note->time() >= 0);
	assert(midi_view()->note_mode() == Sustained || midi_view()->note_mode() == Percussive);
	
	// dont display notes beyond the region bounds
	if ( note->time() - _region->start() >= _region->length() ||
		note->time() <  _region->start() ||
		note->note() < midi_stream_view()->lowest_note() ||
		note->note() > midi_stream_view()->highest_note() ) {
		return;
	}
	
	ArdourCanvas::Group* const group = (ArdourCanvas::Group*)get_canvas_group();

	CanvasNoteEvent* event = 0;
	
	const double x = trackview.editor().frame_to_pixel((nframes64_t)note->time() - _region->start());
	
	if (midi_view()->note_mode() == Sustained) {

		const double y1 = midi_stream_view()->note_to_y(note->note());
		const double note_endpixel = 
			trackview.editor().frame_to_pixel((nframes64_t)note->end_time() - _region->start());
		
		CanvasNote* ev_rect = new CanvasNote(*this, *group, note);
		ev_rect->property_x1() = x;
		ev_rect->property_y1() = y1;
		if (note->length() > 0)
			ev_rect->property_x2() = note_endpixel;
		else
			ev_rect->property_x2() = trackview.editor().frame_to_pixel(_region->length());
		ev_rect->property_y2() = y1 + floor(midi_stream_view()->note_height());

		if (note->length() == 0) {

			if (_active_notes) {
				assert(note->note() < 128);
				// If this note is already active there's a stuck note,
				// finish the old note rectangle
				if (_active_notes[note->note()]) {
					CanvasNote* const old_rect = _active_notes[note->note()];
					boost::shared_ptr<NoteType> old_note = old_rect->note();
					cerr << "MidiModel: WARNING: Note has length 0: chan " << old_note->channel()
						<< "note " << (int)old_note->note() << " @ " << old_note->time() << endl;
					/* FIXME: How large to make it?  Make it a diamond? */
					old_rect->property_x2() = old_rect->property_x1() + 2.0;
					old_rect->property_outline_what() = (guint32) 0xF;
				}
				_active_notes[note->note()] = ev_rect;
			}
			/* outline all but right edge */
			ev_rect->property_outline_what() = (guint32) (0x1 & 0x4 & 0x8);
		} else {
			/* outline all edges */
			ev_rect->property_outline_what() = (guint32) 0xF;
		}

		ev_rect->show();
		_events.push_back(ev_rect);
		event = ev_rect;

		MidiGhostRegion* gr;

		for (std::vector<GhostRegion*>::iterator g = ghosts.begin(); g != ghosts.end(); ++g) {
			if ((gr = dynamic_cast<MidiGhostRegion*>(*g)) != 0) {
				gr->add_note(ev_rect);
			}
		}

	} else if (midi_view()->note_mode() == Percussive) {

		//cerr << "MRV::add_note percussive " << note->note() << " @ " << note->time()
		//	<< " .. " << note->end_time() << endl;

		const double diamond_size = midi_stream_view()->note_height() / 2.0;
		const double y = midi_stream_view()->note_to_y(note->note()) + ((diamond_size-2) / 4.0);

		CanvasHit* ev_diamond = new CanvasHit(*this, *group, diamond_size, note);
		ev_diamond->move(x, y);
		ev_diamond->show();
		_events.push_back(ev_diamond);
		event = ev_diamond;
	} else {
		event = 0;
	}

	if (event) {
		if (_marked_for_selection.find(note) != _marked_for_selection.end()) {
			note_selected(event, true);
		}
		event->on_channel_selection_change(_last_channel_selection);
	}
}

void
MidiRegionView::add_pgm_change(ControlEvent& program, string displaytext)
{
	assert(program.time >= 0);
	
	// dont display program changes beyond the region bounds
	if (program.time - _region->start() >= _region->length() || program.time <  _region->start()) 
		return;
	
	ArdourCanvas::Group* const group = (ArdourCanvas::Group*)get_canvas_group();
	const double x = trackview.editor().frame_to_pixel((nframes64_t)program.time - _region->start());
	
	double height = midi_stream_view()->contents_height();
	
	boost::shared_ptr<CanvasProgramChange> pgm_change = boost::shared_ptr<CanvasProgramChange>(
			new CanvasProgramChange(
					*this, 
					*group, 
					displaytext, 
					height, 
					x, 
					1.0, 
					_model_name, 
					_custom_device_mode, 
					program.time, 
					program.channel, 
					program.value));
	
	_pgm_changes.push_back(pgm_change);
}

void
MidiRegionView::get_patch_key_at(double time, uint8_t channel, MIDI::Name::PatchPrimaryKey& key)
{
	
	cerr << "getting patch key at " << time << " for channel " << channel << endl;
	Evoral::Parameter bank_select_msb(MidiCCAutomation, channel, MIDI_CTL_MSB_BANK);
	boost::shared_ptr<Evoral::Control>  msb_control = _model->control(bank_select_msb);
	float msb = -1.0;
	if (msb_control != 0) {
		msb = int(msb_control->get_float(true, time));
		cerr << "got msb " << msb;
	}

	Evoral::Parameter bank_select_lsb(MidiCCAutomation, channel, MIDI_CTL_LSB_BANK);
	boost::shared_ptr<Evoral::Control>  lsb_control = _model->control(bank_select_lsb);
	float lsb = -1.0;
	if (lsb_control != 0) {
		lsb = lsb_control->get_float(true, time);
		cerr << " got lsb " << lsb;
	}
	
	Evoral::Parameter program_change(MidiPgmChangeAutomation, channel, 0);
	boost::shared_ptr<Evoral::Control>  program_control = _model->control(program_change);
	float program_number = -1.0;
	if (program_control != 0) {
		program_number = program_control->get_float(true, time);
		cerr << " got program " << program_number << endl;
	}
	
	key.msb = (int) floor(msb + 0.5);
	key.lsb = (int) floor(lsb + 0.5);
	key.program_number = (int) floor(program_number + 0.5);
	assert(key.is_sane());
}


void 
MidiRegionView::alter_program_change(ControlEvent& old_program, const MIDI::Name::PatchPrimaryKey& new_patch)
{
	
	// TODO: Get the real event here and alter them at the original times
	Evoral::Parameter bank_select_msb(MidiCCAutomation, old_program.channel, MIDI_CTL_MSB_BANK);
	boost::shared_ptr<Evoral::Control>  msb_control = _model->control(bank_select_msb);
	if (msb_control != 0) {
		msb_control->set_float(float(new_patch.msb), true, old_program.time);
	}

	// TODO: Get the real event here and alter them at the original times
	Evoral::Parameter bank_select_lsb(MidiCCAutomation, old_program.channel, MIDI_CTL_LSB_BANK);
	boost::shared_ptr<Evoral::Control>  lsb_control = _model->control(bank_select_lsb);
	if (lsb_control != 0) {
		lsb_control->set_float(float(new_patch.lsb), true, old_program.time);
	}
	
	Evoral::Parameter program_change(MidiPgmChangeAutomation, old_program.channel, 0);
	boost::shared_ptr<Evoral::Control>  program_control = _model->control(program_change);
	
	assert(program_control != 0);
	program_control->set_float(float(new_patch.program_number), true, old_program.time);
	
	redisplay_model();
}

void
MidiRegionView::program_selected(CanvasProgramChange& program, const MIDI::Name::PatchPrimaryKey& new_patch)
{
	ControlEvent program_change_event(program.event_time(), program.program(), program.channel());
	alter_program_change(program_change_event, new_patch);
}

void 
MidiRegionView::previous_program(CanvasProgramChange& program)
{
	MIDI::Name::PatchPrimaryKey key;
	get_patch_key_at(program.event_time(), program.channel(), key);
	
	boost::shared_ptr<MIDI::Name::Patch> patch = 
		MIDI::Name::MidiPatchManager::instance().previous_patch(
				_model_name,
				_custom_device_mode, 
				program.channel(), 
				key
		);
	
	ControlEvent program_change_event(program.event_time(), program.program(), program.channel());
	if (patch) {
		alter_program_change(program_change_event, patch->patch_primary_key());
	}
}

void 
MidiRegionView::next_program(CanvasProgramChange& program)
{
	MIDI::Name::PatchPrimaryKey key;
	get_patch_key_at(program.event_time(), program.channel(), key);
	
	boost::shared_ptr<MIDI::Name::Patch> patch = 
		MIDI::Name::MidiPatchManager::instance().next_patch(
				_model_name,
				_custom_device_mode, 
				program.channel(), 
				key
		);	
	ControlEvent program_change_event(program.event_time(), program.program(), program.channel());
	if (patch) {
		alter_program_change(program_change_event, patch->patch_primary_key());
	}
}

void
MidiRegionView::delete_selection()
{
	assert(_delta_command);

	for (Selection::iterator i = _selection.begin(); i != _selection.end(); ++i) {
		if ((*i)->selected()) {
			_delta_command->remove((*i)->note());
		}
	}

	_selection.clear();
}

void
MidiRegionView::clear_selection_except(ArdourCanvas::CanvasNoteEvent* ev)
{
	for (Selection::iterator i = _selection.begin(); i != _selection.end(); ++i) {
		if ((*i)->selected() && (*i) != ev) {
			(*i)->selected(false);
		}
	}

	_selection.clear();
}

void
MidiRegionView::unique_select(ArdourCanvas::CanvasNoteEvent* ev)
{
	for (Selection::iterator i = _selection.begin(); i != _selection.end(); ++i) {
		if ((*i) != ev) {
			(*i)->selected(false);
		}
	}

	_selection.clear();
	_selection.insert(ev);

	if ( ! ev->selected()) {
		ev->selected(true);
	}
}

void
MidiRegionView::note_selected(ArdourCanvas::CanvasNoteEvent* ev, bool add)
{
	if ( ! add) {
		clear_selection_except(ev);
	}

	if (_selection.insert(ev).second) {
		play_midi_note(ev->note());
	}

	if ( ! ev->selected()) {
		ev->selected(true);
	}
}


void
MidiRegionView::note_deselected(ArdourCanvas::CanvasNoteEvent* ev, bool add)
{
	if ( ! add) {
		clear_selection_except(ev);
	}

	_selection.erase(ev);

	if (ev->selected()) {
		ev->selected(false);
	}
}


void
MidiRegionView::update_drag_selection(double x1, double x2, double y1, double y2)
{
	const double last_y = std::min(y1, y2);
	const double y      = std::max(y1, y2);

	// TODO: Make this faster by storing the last updated selection rect, and only
	// adjusting things that are in the area that appears/disappeared.
	// We probably need a tree to be able to find events in O(log(n)) time.

#ifndef NDEBUG
	double last_x1 = 0.0;
#endif

	if (x1 < x2) {
		for (Events::iterator i = _events.begin(); i != _events.end(); ++i) {
#ifndef NDEBUG
			// Events should always be sorted by increasing x1() here
			assert((*i)->x1() >= last_x1);
			last_x1 = (*i)->x1();
#endif
			// Inside rectangle
			if ((*i)->x1() >= x1 && (*i)->x1() <= x2 && (*i)->y1() >= last_y && (*i)->y1() <= y) {
				if (!(*i)->selected()) {
					(*i)->selected(true);
					_selection.insert(*i);
					play_midi_note((*i)->note());
				}
			// Not inside rectangle
			} else if ((*i)->selected()) {
				(*i)->selected(false);
				_selection.erase(*i);
			}
		}
	} else {
		for (Events::iterator i = _events.begin(); i != _events.end(); ++i) {
#ifndef NDEBUG
			// Events should always be sorted by increasing x1() here
			assert((*i)->x1() >= last_x1);
			last_x1 = (*i)->x1();
#endif
			// Inside rectangle
			if ((*i)->x2() <= x1 && (*i)->x2() >= x2 && (*i)->y1() >= last_y && (*i)->y1() <= y) {
				if (!(*i)->selected()) {
					(*i)->selected(true);
					_selection.insert(*i);
					play_midi_note((*i)->note());
				}
			// Not inside rectangle
			} else if ((*i)->selected()) {
				(*i)->selected(false);
				_selection.erase(*i);
			}
		}
	}
}


void
MidiRegionView::move_selection(double dx, double dy)
{
	for (Selection::iterator i = _selection.begin(); i != _selection.end(); ++i)
		(*i)->move_event(dx, dy);
}


void
MidiRegionView::note_dropped(CanvasNoteEvent* ev, double dt, uint8_t dnote)
{
	// TODO: This would be faster/nicer with a MoveCommand that doesn't need to copy...
	if (_selection.find(ev) != _selection.end()) {
		uint8_t lowest_note_in_selection  = midi_stream_view()->lowest_note();
		uint8_t highest_note_in_selection = midi_stream_view()->highest_note();
		uint8_t highest_note_difference = 0;

		// find highest and lowest notes first
		for (Selection::iterator i = _selection.begin(); i != _selection.end(); ++i) {
			uint8_t pitch = (*i)->note()->note();
			lowest_note_in_selection  = std::min(lowest_note_in_selection,  pitch);
			highest_note_in_selection = std::max(highest_note_in_selection, pitch);
		}
		
		/*
		cerr << "dnote: " << (int) dnote << endl;
		cerr << "lowest note (streamview): " << int(midi_stream_view()->lowest_note()) 
		     << " highest note (streamview): " << int(midi_stream_view()->highest_note()) << endl;
		cerr << "lowest note (selection): " << int(lowest_note_in_selection) << " highest note(selection): " 
		     << int(highest_note_in_selection) << endl;
		cerr << "selection size: " << _selection.size() << endl;
		cerr << "Highest note in selection: " << (int) highest_note_in_selection << endl;
		*/
		
		// Make sure the note pitch does not exceed the MIDI standard range
		if (dnote <= 127 && (highest_note_in_selection + dnote > 127)) {
			highest_note_difference = highest_note_in_selection - 127;
		}
		
		start_delta_command(_("move notes"));

		for (Selection::iterator i = _selection.begin(); i != _selection.end() ; ) {
			Selection::iterator next = i;
			++next;

			const boost::shared_ptr<NoteType> copy(new NoteType(*(*i)->note().get()));

			// we need to snap here again in nframes64_t in order to be sample accurate 
			double new_note_time = (*i)->note()->time();
			new_note_time +=  dt;

			// keep notes inside region if dragged beyond left region bound
			if (new_note_time < _region->start()) {				
				new_note_time = _region->start();
			}
			
			// since note time is region-absolute but snap_to_frame expects position-relative
			// time we have to coordinate transform back and forth here.
			new_note_time = snap_to_frame(nframes64_t(new_note_time) - _region->start()) + _region->start();
			
			copy->set_time(new_note_time);

			uint8_t original_pitch = (*i)->note()->note();
			uint8_t new_pitch =  original_pitch + dnote - highest_note_difference;
			
			// keep notes in standard midi range
			clamp_0_to_127(new_pitch);
			
			//notes which are dragged beyond the standard midi range snap back to their original place
			if ((original_pitch != 0 && new_pitch == 0) || (original_pitch != 127 && new_pitch == 127)) {
				new_pitch = original_pitch;
			}

			lowest_note_in_selection  = std::min(lowest_note_in_selection,  new_pitch);
			highest_note_in_selection = std::max(highest_note_in_selection, new_pitch);

			copy->set_note(new_pitch);
			
			command_remove_note(*i);
			command_add_note(copy, (*i)->selected());

			i = next;
		}

		apply_command();
		
		// care about notes being moved beyond the upper/lower bounds on the canvas
		if (lowest_note_in_selection  < midi_stream_view()->lowest_note() ||
				highest_note_in_selection > midi_stream_view()->highest_note()) {
			midi_stream_view()->set_note_range(MidiStreamView::ContentsRange);
		}
	}
}

nframes64_t
MidiRegionView::snap_to_frame(double x)
{
	PublicEditor &editor = trackview.editor();
	// x is region relative
	// convert x to global frame
	nframes64_t frame = editor.pixel_to_frame(x) + _region->position();
	editor.snap_to(frame);
	// convert event_frame back to local coordinates relative to position
	frame -= _region->position();
	return frame;
}

nframes64_t
MidiRegionView::snap_to_frame(nframes64_t x)
{
	PublicEditor &editor = trackview.editor();
	// x is region relative
	// convert x to global frame
	nframes64_t frame = x + _region->position();
	editor.snap_to(frame);
	// convert event_frame back to local coordinates relative to position
	frame -= _region->position();
	return frame;
}

double
MidiRegionView::snap_to_pixel(double x)
{
	return (double) trackview.editor().frame_to_pixel(snap_to_frame(x));
}

double
MidiRegionView::get_position_pixels()
{
	nframes64_t region_frame = get_position();
	return trackview.editor().frame_to_pixel(region_frame);
}

void
MidiRegionView::begin_resizing(CanvasNote::NoteEnd note_end)
{
	_resize_data.clear();

	for (Selection::iterator i = _selection.begin(); i != _selection.end(); ++i) {
		CanvasNote *note = dynamic_cast<CanvasNote *> (*i);

		// only insert CanvasNotes into the map
		if (note) {
			NoteResizeData *resize_data = new NoteResizeData();
			resize_data->canvas_note = note;

			// create a new SimpleRect from the note which will be the resize preview
			SimpleRect *resize_rect =
				new SimpleRect(
						*group,
						note->x1(),
						note->y1(),
						note->x2(),
						note->y2());

			// calculate the colors: get the color settings
			uint32_t fill_color =
				UINT_RGBA_CHANGE_A(
						ARDOUR_UI::config()->canvasvar_MidiNoteSelected.get(),
						128);

			// make the resize preview notes more transparent and bright
			fill_color = UINT_INTERPOLATE(fill_color, 0xFFFFFF40, 0.5);

			// calculate color based on note velocity
			resize_rect->property_fill_color_rgba() =
				UINT_INTERPOLATE(
					CanvasNoteEvent::meter_style_fill_color(note->note()->velocity()),
					fill_color,
					0.85);

			resize_rect->property_outline_color_rgba() =
				CanvasNoteEvent::calculate_outline(ARDOUR_UI::config()->canvasvar_MidiNoteSelected.get());

			resize_data->resize_rect = resize_rect;

			if (note_end == CanvasNote::NOTE_ON) {
				resize_data->current_x = note->x1();
			} else { // NOTE_OFF
				resize_data->current_x = note->x2();
			}

			_resize_data.push_back(resize_data);
		}
	}
}

void
MidiRegionView::update_resizing(CanvasNote::NoteEnd note_end, double x, bool relative)
{
	for (std::vector<NoteResizeData *>::iterator i = _resize_data.begin(); i != _resize_data.end(); ++i) {
		SimpleRect     *resize_rect = (*i)->resize_rect;
		CanvasNote     *canvas_note = (*i)->canvas_note;

		const double region_start = get_position_pixels();

		if (relative) {
			(*i)->current_x = (*i)->current_x + x;
		} else {
			// x is in track relative, transform it to region relative
			(*i)->current_x = x - region_start;
		}

		double current_x = (*i)->current_x;

		if (note_end == CanvasNote::NOTE_ON) {
			resize_rect->property_x1() = snap_to_pixel(current_x);
			resize_rect->property_x2() = canvas_note->x2();
		} else {
			resize_rect->property_x2() = snap_to_pixel(current_x);
			resize_rect->property_x1() = canvas_note->x1();
		}
	}
}

void
MidiRegionView::commit_resizing(CanvasNote::NoteEnd note_end, double event_x, bool relative)
{
	start_delta_command(_("resize notes"));

	for (std::vector<NoteResizeData *>::iterator i = _resize_data.begin(); i != _resize_data.end(); ++i) {
		CanvasNote*  canvas_note = (*i)->canvas_note;
		SimpleRect*  resize_rect = (*i)->resize_rect;
		double       current_x   = (*i)->current_x;
		const double position    = get_position_pixels();

		if (!relative) {
			// event_x is in track relative, transform it to region relative
			current_x = event_x - position;
		}

		// because snapping works on world coordinates we have to transform current_x
		// to world coordinates before snapping and transform it back afterwards
		nframes64_t current_frame = snap_to_frame(current_x);
		// transform to region start relative
		current_frame += _region->start();
		
		const boost::shared_ptr<NoteType> copy(new NoteType(*(canvas_note->note().get())));

		// resize beginning of note
		if (note_end == CanvasNote::NOTE_ON && current_frame < copy->end_time()) {
			command_remove_note(canvas_note);
			copy->on_event().time() = current_frame;
			command_add_note(copy, _selection.find(canvas_note) != _selection.end());
		}
		// resize end of note
		if (note_end == CanvasNote::NOTE_OFF && current_frame > copy->time()) {
			command_remove_note(canvas_note);
			copy->off_event().time() = current_frame;
			command_add_note(copy, _selection.find(canvas_note) != _selection.end());
		}

		delete resize_rect;
		delete (*i);
	}

	_resize_data.clear();
	apply_command();
}

void
MidiRegionView::change_note_velocity(CanvasNoteEvent* event, int8_t velocity, bool relative)
{
	const boost::shared_ptr<NoteType> copy(new NoteType(*(event->note().get())));

	if (relative) {
		uint8_t new_velocity = copy->velocity() + velocity;
		clamp_0_to_127(new_velocity);
		copy->set_velocity(new_velocity);
	} else {
		copy->set_velocity(velocity);			
	}

	command_remove_note(event);
	command_add_note(copy, event->selected());
}

void
MidiRegionView::change_velocity(CanvasNoteEvent* ev, int8_t velocity, bool relative)
{
	start_delta_command(_("change velocity"));
	
	change_note_velocity(ev, velocity, relative);

	for (Selection::iterator i = _selection.begin(); i != _selection.end();) {
		Selection::iterator next = i;
		++next;
		if ( !(*((*i)->note()) == *(ev->note())) ) {
			change_note_velocity(*i, velocity, relative);
		}
		i = next;
	}
	
	apply_command();
}

void
MidiRegionView::change_channel(uint8_t channel)
{
	start_delta_command(_("change channel"));
	for (Selection::iterator i = _selection.begin(); i != _selection.end();) {
		Selection::iterator next = i;
		++next;

		CanvasNoteEvent* event = *i;
		const boost::shared_ptr<NoteType> copy(new NoteType(*(event->note().get())));

		copy->set_channel(channel);
		
		command_remove_note(event);
		command_add_note(copy, event->selected());
		
		i = next;
	}
	
	apply_command();
}


void
MidiRegionView::note_entered(ArdourCanvas::CanvasNoteEvent* ev)
{
	if (ev->note() && _mouse_state == EraseTouchDragging) {
		start_delta_command(_("note entered"));
		ev->selected(true);
		_delta_command->remove(ev->note());
	} else if (_mouse_state == SelectTouchDragging) {
		note_selected(ev, true);
	}
}


void
MidiRegionView::switch_source(boost::shared_ptr<Source> src)
{
	boost::shared_ptr<MidiSource> msrc = boost::dynamic_pointer_cast<MidiSource>(src);
	if (msrc)
		display_model(msrc->model());
}

void
MidiRegionView::set_frame_color()
{
	if (frame) {
		if (_selected && should_show_selection) {
			frame->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_SelectedFrameBase.get();
		} else {
			frame->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_MidiFrameBase.get();
		}
	}
}

void 
MidiRegionView::midi_channel_mode_changed(ChannelMode mode, uint16_t mask)
{
	switch (mode) {
	case AllChannels:
	case FilterChannels:
		_force_channel = -1;
		break;
	case ForceChannel:
		_force_channel = mask;
		mask = 0xFFFF; // Show all notes as active (below)
	};

	// Update notes for selection
	for (Events::iterator i = _events.begin(); i != _events.end(); ++i) {
		(*i)->on_channel_selection_change(mask);
	}

	_last_channel_selection = mask;
}

void 
MidiRegionView::midi_patch_settings_changed(std::string model, std::string custom_device_mode)
{
	_model_name         = model;
	_custom_device_mode = custom_device_mode;
	redisplay_model();
}