livetrax/gtk2_ardour/editor_ops.cc

/*
    Copyright (C) 2000-2004 Paul Davis

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

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

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

*/

/* Note: public Editor methods are documented in public_editor.h */

#include <unistd.h>

#include <cstdlib>
#include <cmath>
#include <string>
#include <map>
#include <set>

#include "pbd/error.h"
#include "pbd/basename.h"
#include "pbd/pthread_utils.h"
#include "pbd/memento_command.h"
#include "pbd/unwind.h"
#include "pbd/whitespace.h"
#include "pbd/stateful_diff_command.h"

#include <gtkmm2ext/utils.h>
#include <gtkmm2ext/choice.h>
#include <gtkmm2ext/popup.h>

#include "ardour/audio_track.h"
#include "ardour/audioregion.h"
#include "ardour/dB.h"
#include "ardour/location.h"
#include "ardour/midi_region.h"
#include "ardour/midi_track.h"
#include "ardour/operations.h"
#include "ardour/playlist_factory.h"
#include "ardour/quantize.h"
#include "ardour/region_factory.h"
#include "ardour/reverse.h"
#include "ardour/session.h"
#include "ardour/session_playlists.h"
#include "ardour/strip_silence.h"
#include "ardour/transient_detector.h"

#include "ardour_ui.h"
#include "debug.h"
#include "editor.h"
#include "time_axis_view.h"
#include "route_time_axis.h"
#include "audio_time_axis.h"
#include "automation_time_axis.h"
#include "control_point.h"
#include "streamview.h"
#include "audio_streamview.h"
#include "audio_region_view.h"
#include "midi_region_view.h"
#include "rgb_macros.h"
#include "selection_templates.h"
#include "selection.h"
#include "editing.h"
#include "gtk-custom-hruler.h"
#include "gui_thread.h"
#include "keyboard.h"
#include "utils.h"
#include "editor_drag.h"
#include "strip_silence_dialog.h"
#include "editor_routes.h"
#include "editor_regions.h"
#include "quantize_dialog.h"
#include "interthread_progress_window.h"
#include "insert_time_dialog.h"
#include "normalize_dialog.h"
#include "editor_cursors.h"
#include "mouse_cursors.h"
#include "patch_change_dialog.h"
#include "transpose_dialog.h"

#include "i18n.h"

using namespace std;
using namespace ARDOUR;
using namespace PBD;
using namespace Gtk;
using namespace Gtkmm2ext;
using namespace Editing;
using Gtkmm2ext::Keyboard;

/***********************************************************************
  Editor operations
 ***********************************************************************/

void
Editor::undo (uint32_t n)
{
	if (_drags->active ()) {
		_drags->abort ();
	}
	
	if (_session) {
		_session->undo (n);
	}
}

void
Editor::redo (uint32_t n)
{
	if (_drags->active ()) {
		_drags->abort ();
	}
	
	if (_session) {
		_session->redo (n);
	}
}

void
Editor::split_regions_at (framepos_t where, RegionSelection& regions)
{
	bool frozen = false;

	list <boost::shared_ptr<Playlist > > used_playlists;

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

	begin_reversible_command (_("split"));

	// if splitting a single region, and snap-to is using
	// region boundaries, don't pay attention to them

	if (regions.size() == 1) {
		switch (_snap_type) {
		case SnapToRegionStart:
		case SnapToRegionSync:
		case SnapToRegionEnd:
			break;
		default:
			snap_to (where);
		}
	} else {
		snap_to (where);

		frozen = true;
		EditorFreeze(); /* Emit Signal */
	}

	for (RegionSelection::iterator a = regions.begin(); a != regions.end(); ) {

		RegionSelection::iterator tmp;

		/* XXX this test needs to be more complicated, to make sure we really
		   have something to split.
		*/

		if (!(*a)->region()->covers (where)) {
			++a;
			continue;
		}

		tmp = a;
		++tmp;

		boost::shared_ptr<Playlist> pl = (*a)->region()->playlist();

		if (!pl) {
			a = tmp;
			continue;
		}

		if (!pl->frozen()) {
			/* we haven't seen this playlist before */

			/* remember used playlists so we can thaw them later */
			used_playlists.push_back(pl);
			pl->freeze();
		}

		if (pl) {
			pl->clear_changes ();
			pl->split_region ((*a)->region(), where);
			_session->add_command (new StatefulDiffCommand (pl));
		}

		a = tmp;
	}

	while (used_playlists.size() > 0) {
		list <boost::shared_ptr<Playlist > >::iterator i = used_playlists.begin();
		(*i)->thaw();
		used_playlists.pop_front();
	}

	commit_reversible_command ();

	if (frozen){
		EditorThaw(); /* Emit Signal */
	}
}

/** Move one extreme of the current range selection.  If more than one range is selected,
 *  the start of the earliest range or the end of the latest range is moved.
 *
 *  @param move_end true to move the end of the current range selection, false to move
 *  the start.
 *  @param next true to move the extreme to the next region boundary, false to move to
 *  the previous.
 */
void
Editor::move_range_selection_start_or_end_to_region_boundary (bool move_end, bool next)
{
	if (selection->time.start() == selection->time.end_frame()) {
		return;
	}

	framepos_t start = selection->time.start ();
	framepos_t end = selection->time.end_frame ();

	/* the position of the thing we may move */
	framepos_t pos = move_end ? end : start;
	int dir = next ? 1 : -1;

	/* so we don't find the current region again */
	if (dir > 0 || pos > 0) {
		pos += dir;
	}

	framepos_t const target = get_region_boundary (pos, dir, true, false);
	if (target < 0) {
		return;
	}

	if (move_end) {
		end = target;
	} else {
		start = target;
	}

	if (end < start) {
		return;
	}

	begin_reversible_command (_("alter selection"));
	selection->set_preserving_all_ranges (start, end);
	commit_reversible_command ();
}

bool
Editor::nudge_forward_release (GdkEventButton* ev)
{
	if (ev->state & Keyboard::PrimaryModifier) {
		nudge_forward (false, true);
	} else {
		nudge_forward (false, false);
	}
	return false;
}

bool
Editor::nudge_backward_release (GdkEventButton* ev)
{
	if (ev->state & Keyboard::PrimaryModifier) {
		nudge_backward (false, true);
	} else {
		nudge_backward (false, false);
	}
	return false;
}


void
Editor::nudge_forward (bool next, bool force_playhead)
{
	framepos_t distance;
	framepos_t next_distance;

	if (!_session) {
		return;
	}

	RegionSelection rs = get_regions_from_selection_and_entered ();

	if (!force_playhead && !rs.empty()) {

		begin_reversible_command (_("nudge regions forward"));

		for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
			boost::shared_ptr<Region> r ((*i)->region());

			distance = get_nudge_distance (r->position(), next_distance);

			if (next) {
				distance = next_distance;
			}

			r->clear_changes ();
			r->set_position (r->position() + distance);
			_session->add_command (new StatefulDiffCommand (r));
		}

		commit_reversible_command ();


	} else if (!force_playhead && !selection->markers.empty()) {

		bool is_start;

		begin_reversible_command (_("nudge location forward"));

		for (MarkerSelection::iterator i = selection->markers.begin(); i != selection->markers.end(); ++i) {

			Location* loc = find_location_from_marker ((*i), is_start);

			if (loc) {

				XMLNode& before (loc->get_state());

				if (is_start) {
					distance = get_nudge_distance (loc->start(), next_distance);
					if (next) {
						distance = next_distance;
					}
					if (max_framepos - distance > loc->start() + loc->length()) {
						loc->set_start (loc->start() + distance);
					} else {
						loc->set_start (max_framepos - loc->length());
					}
				} else {
					distance = get_nudge_distance (loc->end(), next_distance);
					if (next) {
						distance = next_distance;
					}
					if (max_framepos - distance > loc->end()) {
						loc->set_end (loc->end() + distance);
					} else {
						loc->set_end (max_framepos);
					}
				}
				XMLNode& after (loc->get_state());
				_session->add_command (new MementoCommand<Location>(*loc, &before, &after));
			}
		}

		commit_reversible_command ();

	} else {
		distance = get_nudge_distance (playhead_cursor->current_frame, next_distance);
		_session->request_locate (playhead_cursor->current_frame + distance);
	}
}

void
Editor::nudge_backward (bool next, bool force_playhead)
{
	framepos_t distance;
	framepos_t next_distance;

	if (!_session) {
		return;
	}

	RegionSelection rs = get_regions_from_selection_and_entered ();

	if (!force_playhead && !rs.empty()) {

		begin_reversible_command (_("nudge regions backward"));

		for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
			boost::shared_ptr<Region> r ((*i)->region());

			distance = get_nudge_distance (r->position(), next_distance);

			if (next) {
				distance = next_distance;
			}

			r->clear_changes ();

			if (r->position() > distance) {
				r->set_position (r->position() - distance);
			} else {
				r->set_position (0);
			}
			_session->add_command (new StatefulDiffCommand (r));
		}

		commit_reversible_command ();

	} else if (!force_playhead && !selection->markers.empty()) {

		bool is_start;

		begin_reversible_command (_("nudge location forward"));

		for (MarkerSelection::iterator i = selection->markers.begin(); i != selection->markers.end(); ++i) {

			Location* loc = find_location_from_marker ((*i), is_start);

			if (loc) {

				XMLNode& before (loc->get_state());

				if (is_start) {
					distance = get_nudge_distance (loc->start(), next_distance);
					if (next) {
						distance = next_distance;
					}
					if (distance < loc->start()) {
						loc->set_start (loc->start() - distance);
					} else {
						loc->set_start (0);
					}
				} else {
					distance = get_nudge_distance (loc->end(), next_distance);

					if (next) {
						distance = next_distance;
					}

					if (distance < loc->end() - loc->length()) {
						loc->set_end (loc->end() - distance);
					} else {
						loc->set_end (loc->length());
					}
				}

				XMLNode& after (loc->get_state());
				_session->add_command (new MementoCommand<Location>(*loc, &before, &after));
			}
		}

		commit_reversible_command ();

	} else {

		distance = get_nudge_distance (playhead_cursor->current_frame, next_distance);

		if (playhead_cursor->current_frame > distance) {
			_session->request_locate (playhead_cursor->current_frame - distance);
		} else {
			_session->goto_start();
		}
	}
}

void
Editor::nudge_forward_capture_offset ()
{
	RegionSelection rs = get_regions_from_selection_and_entered ();

	if (!_session || rs.empty()) {
		return;
	}

	begin_reversible_command (_("nudge forward"));

	framepos_t const distance = _session->worst_output_latency();

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
		boost::shared_ptr<Region> r ((*i)->region());

		r->clear_changes ();
		r->set_position (r->position() + distance);
		_session->add_command(new StatefulDiffCommand (r));
	}

	commit_reversible_command ();
}

void
Editor::nudge_backward_capture_offset ()
{
	RegionSelection rs = get_regions_from_selection_and_entered ();

	if (!_session || rs.empty()) {
		return;
	}

	begin_reversible_command (_("nudge backward"));

	framepos_t const distance = _session->worst_output_latency();

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
		boost::shared_ptr<Region> r ((*i)->region());

		r->clear_changes ();

		if (r->position() > distance) {
			r->set_position (r->position() - distance);
		} else {
			r->set_position (0);
		}
		_session->add_command(new StatefulDiffCommand (r));
	}

	commit_reversible_command ();
}

/* DISPLAY MOTION */

void
Editor::move_to_start ()
{
	_session->goto_start ();
}

void
Editor::move_to_end ()
{

	_session->request_locate (_session->current_end_frame());
}

void
Editor::build_region_boundary_cache ()
{
	framepos_t pos = 0;
	vector<RegionPoint> interesting_points;
	boost::shared_ptr<Region> r;
	TrackViewList tracks;
	bool at_end = false;

	region_boundary_cache.clear ();

	if (_session == 0) {
		return;
	}

	switch (_snap_type) {
	case SnapToRegionStart:
		interesting_points.push_back (Start);
		break;
	case SnapToRegionEnd:
		interesting_points.push_back (End);
		break;
	case SnapToRegionSync:
		interesting_points.push_back (SyncPoint);
		break;
	case SnapToRegionBoundary:
		interesting_points.push_back (Start);
		interesting_points.push_back (End);
		break;
	default:
		fatal << string_compose (_("build_region_boundary_cache called with snap_type = %1"), _snap_type) << endmsg;
		/*NOTREACHED*/
		return;
	}

	TimeAxisView *ontrack = 0;
	TrackViewList tlist;
	
	if (!selection->tracks.empty()) {
		tlist = selection->tracks.filter_to_unique_playlists ();
	} else {
		tlist = track_views.filter_to_unique_playlists ();
	}

	while (pos < _session->current_end_frame() && !at_end) {

		framepos_t rpos;
		framepos_t lpos = max_framepos;

		for (vector<RegionPoint>::iterator p = interesting_points.begin(); p != interesting_points.end(); ++p) {

			if ((r = find_next_region (pos, *p, 1, tlist, &ontrack)) == 0) {
				if (*p == interesting_points.back()) {
					at_end = true;
				}
				/* move to next point type */
				continue;
			}

			switch (*p) {
			case Start:
				rpos = r->first_frame();
				break;

			case End:
				rpos = r->last_frame();
				break;

			case SyncPoint:
				rpos = r->sync_position ();
				break;

			default:
				break;
			}

			float speed = 1.0f;
			RouteTimeAxisView *rtav;

			if (ontrack != 0 && (rtav = dynamic_cast<RouteTimeAxisView*>(ontrack)) != 0 ) {
				if (rtav->track() != 0) {
					speed = rtav->track()->speed();
				}
			}

			rpos = track_frame_to_session_frame (rpos, speed);

			if (rpos < lpos) {
				lpos = rpos;
			}

			/* prevent duplicates, but we don't use set<> because we want to be able
			   to sort later.
			*/

			vector<framepos_t>::iterator ri;

			for (ri = region_boundary_cache.begin(); ri != region_boundary_cache.end(); ++ri) {
				if (*ri == rpos) {
					break;
				}
			}

			if (ri == region_boundary_cache.end()) {
				region_boundary_cache.push_back (rpos);
			}
		}

		pos = lpos + 1;
	}

	/* finally sort to be sure that the order is correct */

	sort (region_boundary_cache.begin(), region_boundary_cache.end());
}

boost::shared_ptr<Region>
Editor::find_next_region (framepos_t frame, RegionPoint point, int32_t dir, TrackViewList& tracks, TimeAxisView **ontrack)
{
	TrackViewList::iterator i;
	framepos_t closest = max_framepos;
	boost::shared_ptr<Region> ret;
	framepos_t rpos = 0;

	float track_speed;
	framepos_t track_frame;
	RouteTimeAxisView *rtav;

	for (i = tracks.begin(); i != tracks.end(); ++i) {

		framecnt_t distance;
		boost::shared_ptr<Region> r;

		track_speed = 1.0f;
		if ( (rtav = dynamic_cast<RouteTimeAxisView*>(*i)) != 0 ) {
			if (rtav->track()!=0)
				track_speed = rtav->track()->speed();
		}

		track_frame = session_frame_to_track_frame(frame, track_speed);

		if ((r = (*i)->find_next_region (track_frame, point, dir)) == 0) {
			continue;
		}

		switch (point) {
		case Start:
			rpos = r->first_frame ();
			break;

		case End:
			rpos = r->last_frame ();
			break;

		case SyncPoint:
			rpos = r->sync_position ();
			break;
		}

		// rpos is a "track frame", converting it to "_session frame"
		rpos = track_frame_to_session_frame(rpos, track_speed);

		if (rpos > frame) {
			distance = rpos - frame;
		} else {
			distance = frame - rpos;
		}

		if (distance < closest) {
			closest = distance;
			if (ontrack != 0)
				*ontrack = (*i);
			ret = r;
		}
	}

	return ret;
}

framepos_t
Editor::find_next_region_boundary (framepos_t pos, int32_t dir, const TrackViewList& tracks)
{
	framecnt_t distance = max_framepos;
	framepos_t current_nearest = -1;

	for (TrackViewList::const_iterator i = tracks.begin(); i != tracks.end(); ++i) {
		framepos_t contender;
		framecnt_t d;

		RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*> (*i);

		if (!rtv) {
			continue;
		}

		if ((contender = rtv->find_next_region_boundary (pos, dir)) < 0) {
			continue;
		}

		d = ::llabs (pos - contender);

		if (d < distance) {
			current_nearest = contender;
			distance = d;
		}
	}

	return current_nearest;
}

framepos_t
Editor::get_region_boundary (framepos_t pos, int32_t dir, bool with_selection, bool only_onscreen)
{
	framepos_t target;
	TrackViewList tvl;

	if (with_selection && Config->get_region_boundaries_from_selected_tracks()) {

		if (!selection->tracks.empty()) {

			target = find_next_region_boundary (pos, dir, selection->tracks);

		} else {

			if (only_onscreen || Config->get_region_boundaries_from_onscreen_tracks()) {
				get_onscreen_tracks (tvl);
				target = find_next_region_boundary (pos, dir, tvl);
			} else {
				target = find_next_region_boundary (pos, dir, track_views);
			}
		}

	} else {

		if (only_onscreen || Config->get_region_boundaries_from_onscreen_tracks()) {
			get_onscreen_tracks (tvl);
			target = find_next_region_boundary (pos, dir, tvl);
		} else {
			target = find_next_region_boundary (pos, dir, track_views);
		}
	}

	return target;
}

void
Editor::cursor_to_region_boundary (bool with_selection, int32_t dir)
{
	framepos_t pos = playhead_cursor->current_frame;
	framepos_t target;

	if (!_session) {
		return;
	}

	// so we don't find the current region again..
	if (dir > 0 || pos > 0) {
		pos += dir;
	}

	if ((target = get_region_boundary (pos, dir, with_selection, false)) < 0) {
		return;
	}

	_session->request_locate (target);
}

void
Editor::cursor_to_next_region_boundary (bool with_selection)
{
	cursor_to_region_boundary (with_selection, 1);
}

void
Editor::cursor_to_previous_region_boundary (bool with_selection)
{
	cursor_to_region_boundary (with_selection, -1);
}

void
Editor::cursor_to_region_point (EditorCursor* cursor, RegionPoint point, int32_t dir)
{
	boost::shared_ptr<Region> r;
	framepos_t pos = cursor->current_frame;

	if (!_session) {
		return;
	}

	TimeAxisView *ontrack = 0;

	// so we don't find the current region again..
	if (dir>0 || pos>0)
		pos+=dir;

	if (!selection->tracks.empty()) {

		r = find_next_region (pos, point, dir, selection->tracks, &ontrack);

	} else if (clicked_axisview) {

		TrackViewList t;
		t.push_back (clicked_axisview);

		r = find_next_region (pos, point, dir, t, &ontrack);

	} else {

		r = find_next_region (pos, point, dir, track_views, &ontrack);
	}

	if (r == 0) {
		return;
	}

	switch (point) {
	case Start:
		pos = r->first_frame ();
		break;

	case End:
		pos = r->last_frame ();
		break;

	case SyncPoint:
		pos = r->sync_position ();
		break;
	}

	float speed = 1.0f;
	RouteTimeAxisView *rtav;

	if ( ontrack != 0 && (rtav = dynamic_cast<RouteTimeAxisView*>(ontrack)) != 0 ) {
		if (rtav->track() != 0) {
			speed = rtav->track()->speed();
		}
	}

	pos = track_frame_to_session_frame(pos, speed);

	if (cursor == playhead_cursor) {
		_session->request_locate (pos);
	} else {
		cursor->set_position (pos);
	}
}

void
Editor::cursor_to_next_region_point (EditorCursor* cursor, RegionPoint point)
{
	cursor_to_region_point (cursor, point, 1);
}

void
Editor::cursor_to_previous_region_point (EditorCursor* cursor, RegionPoint point)
{
	cursor_to_region_point (cursor, point, -1);
}

void
Editor::cursor_to_selection_start (EditorCursor *cursor)
{
	framepos_t pos = 0;

	switch (mouse_mode) {
	case MouseObject:
		if (!selection->regions.empty()) {
			pos = selection->regions.start();
		}
		break;

	case MouseRange:
		if (!selection->time.empty()) {
			pos = selection->time.start ();
		}
		break;

	default:
		return;
	}

	if (cursor == playhead_cursor) {
		_session->request_locate (pos);
	} else {
		cursor->set_position (pos);
	}
}

void
Editor::cursor_to_selection_end (EditorCursor *cursor)
{
	framepos_t pos = 0;

	switch (mouse_mode) {
	case MouseObject:
		if (!selection->regions.empty()) {
			pos = selection->regions.end_frame();
		}
		break;

	case MouseRange:
		if (!selection->time.empty()) {
			pos = selection->time.end_frame ();
		}
		break;

	default:
		return;
	}

	if (cursor == playhead_cursor) {
		_session->request_locate (pos);
	} else {
		cursor->set_position (pos);
	}
}

void
Editor::selected_marker_to_region_boundary (bool with_selection, int32_t dir)
{
	framepos_t target;
	Location* loc;
	bool ignored;

	if (!_session) {
		return;
	}

	if (selection->markers.empty()) {
		framepos_t mouse;
		bool ignored;

		if (!mouse_frame (mouse, ignored)) {
			return;
		}

		add_location_mark (mouse);
	}

	if ((loc = find_location_from_marker (selection->markers.front(), ignored)) == 0) {
		return;
	}

	framepos_t pos = loc->start();

	// so we don't find the current region again..
	if (dir > 0 || pos > 0) {
		pos += dir;
	}

	if ((target = get_region_boundary (pos, dir, with_selection, false)) < 0) {
		return;
	}

	loc->move_to (target);
}

void
Editor::selected_marker_to_next_region_boundary (bool with_selection)
{
	selected_marker_to_region_boundary (with_selection, 1);
}

void
Editor::selected_marker_to_previous_region_boundary (bool with_selection)
{
	selected_marker_to_region_boundary (with_selection, -1);
}

void
Editor::selected_marker_to_region_point (RegionPoint point, int32_t dir)
{
	boost::shared_ptr<Region> r;
	framepos_t pos;
	Location* loc;
	bool ignored;

	if (!_session || selection->markers.empty()) {
		return;
	}

	if ((loc = find_location_from_marker (selection->markers.front(), ignored)) == 0) {
		return;
	}

	TimeAxisView *ontrack = 0;

	pos = loc->start();

	// so we don't find the current region again..
	if (dir>0 || pos>0)
		pos+=dir;

	if (!selection->tracks.empty()) {

		r = find_next_region (pos, point, dir, selection->tracks, &ontrack);

	} else {

		r = find_next_region (pos, point, dir, track_views, &ontrack);
	}

	if (r == 0) {
		return;
	}

	switch (point) {
	case Start:
		pos = r->first_frame ();
		break;

	case End:
		pos = r->last_frame ();
		break;

	case SyncPoint:
		pos = r->adjust_to_sync (r->first_frame());
		break;
	}

	float speed = 1.0f;
	RouteTimeAxisView *rtav;

	if (ontrack != 0 && (rtav = dynamic_cast<RouteTimeAxisView*>(ontrack)) != 0) {
		if (rtav->track() != 0) {
			speed = rtav->track()->speed();
		}
	}

	pos = track_frame_to_session_frame(pos, speed);

	loc->move_to (pos);
}

void
Editor::selected_marker_to_next_region_point (RegionPoint point)
{
	selected_marker_to_region_point (point, 1);
}

void
Editor::selected_marker_to_previous_region_point (RegionPoint point)
{
	selected_marker_to_region_point (point, -1);
}

void
Editor::selected_marker_to_selection_start ()
{
	framepos_t pos = 0;
	Location* loc;
	bool ignored;

	if (!_session || selection->markers.empty()) {
		return;
	}

	if ((loc = find_location_from_marker (selection->markers.front(), ignored)) == 0) {
		return;
	}

	switch (mouse_mode) {
	case MouseObject:
		if (!selection->regions.empty()) {
			pos = selection->regions.start();
		}
		break;

	case MouseRange:
		if (!selection->time.empty()) {
			pos = selection->time.start ();
		}
		break;

	default:
		return;
	}

	loc->move_to (pos);
}

void
Editor::selected_marker_to_selection_end ()
{
	framepos_t pos = 0;
	Location* loc;
	bool ignored;

	if (!_session || selection->markers.empty()) {
		return;
	}

	if ((loc = find_location_from_marker (selection->markers.front(), ignored)) == 0) {
		return;
	}

	switch (mouse_mode) {
	case MouseObject:
		if (!selection->regions.empty()) {
			pos = selection->regions.end_frame();
		}
		break;

	case MouseRange:
		if (!selection->time.empty()) {
			pos = selection->time.end_frame ();
		}
		break;

	default:
		return;
	}

	loc->move_to (pos);
}

void
Editor::scroll_playhead (bool forward)
{
	framepos_t pos = playhead_cursor->current_frame;
	framecnt_t delta = (framecnt_t) floor (current_page_frames() / 0.8);

	if (forward) {
		if (pos == max_framepos) {
			return;
		}

		if (pos < max_framepos - delta) {
			pos += delta ;
		} else {
			pos = max_framepos;
		}

	} else {

		if (pos == 0) {
			return;
		}

		if (pos > delta) {
			pos -= delta;
		} else {
			pos = 0;
		}
	}

	_session->request_locate (pos);
}

void
Editor::cursor_align (bool playhead_to_edit)
{
	if (!_session) {
		return;
	}

	if (playhead_to_edit) {

		if (selection->markers.empty()) {
			return;
		}

		_session->request_locate (selection->markers.front()->position(), _session->transport_rolling());

	} else {
		/* move selected markers to playhead */

		for (MarkerSelection::iterator i = selection->markers.begin(); i != selection->markers.end(); ++i) {
			bool ignored;

			Location* loc = find_location_from_marker (*i, ignored);

			if (loc->is_mark()) {
				loc->set_start (playhead_cursor->current_frame);
			} else {
				loc->set (playhead_cursor->current_frame,
					  playhead_cursor->current_frame + loc->length());
			}
		}
	}
}

void
Editor::scroll_backward (float pages)
{
	framepos_t const one_page = (framepos_t) rint (_canvas_width * frames_per_unit);
	framepos_t const cnt = (framepos_t) floor (pages * one_page);

	framepos_t frame;
	if (leftmost_frame < cnt) {
		frame = 0;
	} else {
		frame = leftmost_frame - cnt;
	}

	reset_x_origin (frame);
}

void
Editor::scroll_forward (float pages)
{
	framepos_t const one_page = (framepos_t) rint (_canvas_width * frames_per_unit);
	framepos_t const cnt = (framepos_t) floor (pages * one_page);

	framepos_t frame;
	if (max_framepos - cnt < leftmost_frame) {
		frame = max_framepos - cnt;
	} else {
		frame = leftmost_frame + cnt;
	}

	reset_x_origin (frame);
}

void
Editor::scroll_tracks_down ()
{
	double vert_value = vertical_adjustment.get_value() + vertical_adjustment.get_page_size();
	if (vert_value > vertical_adjustment.get_upper() - _canvas_height) {
		vert_value = vertical_adjustment.get_upper() - _canvas_height;
	}

	vertical_adjustment.set_value (vert_value);
}

void
Editor::scroll_tracks_up ()
{
	vertical_adjustment.set_value (vertical_adjustment.get_value() - vertical_adjustment.get_page_size());
}

void
Editor::scroll_tracks_down_line ()
{
	double vert_value = vertical_adjustment.get_value() + 60;

	if (vert_value > vertical_adjustment.get_upper() - _canvas_height) {
		vert_value = vertical_adjustment.get_upper() - _canvas_height;
	}

	vertical_adjustment.set_value (vert_value);
}

void
Editor::scroll_tracks_up_line ()
{
	reset_y_origin (vertical_adjustment.get_value() - 60);
}

/* ZOOM */

void
Editor::tav_zoom_step (bool coarser)
{
	_routes->suspend_redisplay ();

	TrackViewList* ts;

	if (selection->tracks.empty()) {
		ts = &track_views;
	} else {
		ts = &selection->tracks;
	}
	
	for (TrackViewList::iterator i = ts->begin(); i != ts->end(); ++i) {
		TimeAxisView *tv = (static_cast<TimeAxisView*>(*i));
			tv->step_height (coarser);
	}

	_routes->resume_redisplay ();
}

void
Editor::tav_zoom_smooth (bool coarser, bool force_all)
{
	_routes->suspend_redisplay ();

	TrackViewList* ts;

	if (selection->tracks.empty() || force_all) {
		ts = &track_views;
	} else {
		ts = &selection->tracks;
	}
	
	for (TrackViewList::iterator i = ts->begin(); i != ts->end(); ++i) {
		TimeAxisView *tv = (static_cast<TimeAxisView*>(*i));
		uint32_t h = tv->current_height ();

		if (coarser) {
			if (h > 5) {
				h -= 5; // pixels
				if (h >= TimeAxisView::preset_height (HeightSmall)) {
					tv->set_height (h);
				}
			}
		} else {
			tv->set_height (h + 5);
		}
	}

	_routes->resume_redisplay ();
}

bool
Editor::clamp_frames_per_unit (double& fpu) const
{
	bool clamped = false;
	
	if (fpu < 2.0) {
		fpu = 2.0;
		clamped = true;
	}

	if (max_framepos / fpu < 800) {
		fpu = max_framepos / 800.0;
		clamped = true;
	}

	return clamped;
}

void
Editor::temporal_zoom_step (bool coarser)
{
	ENSURE_GUI_THREAD (*this, &Editor::temporal_zoom_step, coarser)

	double nfpu = frames_per_unit;

	if (coarser) {
		nfpu = min (9e6, nfpu * 1.61803399);
	} else {
		nfpu = max (1.0, nfpu / 1.61803399);
	}

	temporal_zoom (nfpu);
}

void
Editor::temporal_zoom (double fpu)
{
	if (!_session) {
		return;
	}

	framepos_t current_page = current_page_frames();
	framepos_t current_leftmost = leftmost_frame;
	framepos_t current_rightmost;
	framepos_t current_center;
	framepos_t new_page_size;
	framepos_t half_page_size;
	framepos_t leftmost_after_zoom = 0;
	framepos_t where;
	bool in_track_canvas;
	double nfpu;
	double l;

	clamp_frames_per_unit (fpu);
	if (fpu == frames_per_unit) {
		return;
	}

	nfpu = fpu;
	
	// Imposing an arbitrary limit to zoom out as too much zoom out produces 
	// segfaults for lack of memory. If somebody decides this is not high enough I
	// believe it can be raisen to higher values but some limit must be in place.
	if (nfpu > 8e+08) {
		nfpu = 8e+08;
	}

	new_page_size = (framepos_t) floor (_canvas_width * nfpu);
	half_page_size = new_page_size / 2;

	switch (zoom_focus) {
	case ZoomFocusLeft:
		leftmost_after_zoom = current_leftmost;
		break;

	case ZoomFocusRight:
		current_rightmost = leftmost_frame + current_page;
		if (current_rightmost < new_page_size) {
			leftmost_after_zoom = 0;
		} else {
			leftmost_after_zoom = current_rightmost - new_page_size;
		}
		break;

	case ZoomFocusCenter:
		current_center = current_leftmost + (current_page/2);
		if (current_center < half_page_size) {
			leftmost_after_zoom = 0;
		} else {
			leftmost_after_zoom = current_center - half_page_size;
		}
		break;

	case ZoomFocusPlayhead:
		/* centre playhead */
		l = playhead_cursor->current_frame - (new_page_size * 0.5);

		if (l < 0) {
			leftmost_after_zoom = 0;
		} else if (l > max_framepos) {
			leftmost_after_zoom = max_framepos - new_page_size;
		} else {
			leftmost_after_zoom = (framepos_t) l;
		}
		break;

	case ZoomFocusMouse:
		/* try to keep the mouse over the same point in the display */

		if (!mouse_frame (where, in_track_canvas)) {
			/* use playhead instead */
			where = playhead_cursor->current_frame;

			if (where < half_page_size) {
				leftmost_after_zoom = 0;
			} else {
				leftmost_after_zoom = where - half_page_size;
			}

		} else {

			l = - ((new_page_size * ((where - current_leftmost)/(double)current_page)) - where);

			if (l < 0) {
				leftmost_after_zoom = 0;
			} else if (l > max_framepos) {
				leftmost_after_zoom = max_framepos - new_page_size;
			} else {
				leftmost_after_zoom = (framepos_t) l;
			}
		}

		break;

	case ZoomFocusEdit:
		/* try to keep the edit point in the same place */
		where = get_preferred_edit_position ();

		if (where > 0) {

			double l = - ((new_page_size * ((where - current_leftmost)/(double)current_page)) - where);

			if (l < 0) {
				leftmost_after_zoom = 0;
			} else if (l > max_framepos) {
				leftmost_after_zoom = max_framepos - new_page_size;
			} else {
				leftmost_after_zoom = (framepos_t) l;
			}

		} else {
			/* edit point not defined */
			return;
		}
		break;

	}

	// leftmost_after_zoom = min (leftmost_after_zoom, _session->current_end_frame());

	reposition_and_zoom (leftmost_after_zoom, nfpu);
}

void
Editor::temporal_zoom_region (bool both_axes)
{
	framepos_t start = max_framepos;
	framepos_t end = 0;
	set<TimeAxisView*> tracks;

	RegionSelection rs = get_regions_from_selection_and_entered ();

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

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {

		if ((*i)->region()->position() < start) {
			start = (*i)->region()->position();
		}

		if ((*i)->region()->last_frame() + 1 > end) {
			end = (*i)->region()->last_frame() + 1;
		}

		tracks.insert (&((*i)->get_time_axis_view()));
	}

	/* now comes an "interesting" hack ... make sure we leave a little space
	   at each end of the editor so that the zoom doesn't fit the region
	   precisely to the screen.
	*/

	GdkScreen* screen = gdk_screen_get_default ();
	gint pixwidth = gdk_screen_get_width (screen);
	gint mmwidth = gdk_screen_get_width_mm (screen);
	double pix_per_mm = (double) pixwidth/ (double) mmwidth;
	double one_centimeter_in_pixels = pix_per_mm * 10.0;

	if ((start == 0 && end == 0) || end < start) {
		return;
	}

	framepos_t range = end - start;
	double new_fpu = (double)range / (double)_canvas_width;
	framepos_t extra_samples = (framepos_t) floor (one_centimeter_in_pixels * new_fpu);

	if (start > extra_samples) {
		start -= extra_samples;
	} else {
		start = 0;
	}

	if (max_framepos - extra_samples > end) {
		end += extra_samples;
	} else {
		end = max_framepos;
	}

	/* if we're zooming on both axes we need to save track heights etc.
	 */

	undo_visual_stack.push_back (current_visual_state (both_axes));

	PBD::Unwinder<bool> nsv (no_save_visual, true);

	temporal_zoom_by_frame (start, end);
	
	if (both_axes) {
		uint32_t per_track_height = (uint32_t) floor ((_canvas_height - canvas_timebars_vsize - 10.0) / tracks.size());

		/* set visible track heights appropriately */

		for (set<TimeAxisView*>::iterator t = tracks.begin(); t != tracks.end(); ++t) {
			(*t)->set_height (per_track_height);
		}

		/* hide irrelevant tracks */

		_routes->suspend_redisplay ();

		for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
			if (find (tracks.begin(), tracks.end(), (*i)) == tracks.end()) {
				hide_track_in_display (*i);
			}
		}

		_routes->resume_redisplay ();

		vertical_adjustment.set_value (0.0);
	}

	redo_visual_stack.push_back (current_visual_state (both_axes));
}

void
Editor::zoom_to_region (bool both_axes)
{
	temporal_zoom_region (both_axes);
}

void
Editor::temporal_zoom_selection ()
{
	if (!selection) return;

	if (selection->time.empty()) {
		return;
	}

	framepos_t start = selection->time[clicked_selection].start;
	framepos_t end = selection->time[clicked_selection].end;

	temporal_zoom_by_frame (start, end);
}

void
Editor::temporal_zoom_session ()
{
	ENSURE_GUI_THREAD (*this, &Editor::temporal_zoom_session)

	if (_session) {
		framecnt_t const l = _session->current_end_frame() - _session->current_start_frame();
		double s = _session->current_start_frame() - l * 0.01;
		if (s < 0) {
			s = 0;
		}
		framecnt_t const e = _session->current_end_frame() + l * 0.01;
		temporal_zoom_by_frame (framecnt_t (s), e);
	}
}

void
Editor::temporal_zoom_by_frame (framepos_t start, framepos_t end)
{
	if (!_session) return;

	if ((start == 0 && end == 0) || end < start) {
		return;
	}

	framepos_t range = end - start;

	double new_fpu = (double)range / (double)_canvas_width;

	framepos_t new_page = (framepos_t) floor (_canvas_width * new_fpu);
	framepos_t middle = (framepos_t) floor( (double)start + ((double)range / 2.0f ));
	framepos_t new_leftmost = (framepos_t) floor( (double)middle - ((double)new_page/2.0f));

	if (new_leftmost > middle) {
		new_leftmost = 0;
	}

	if (new_leftmost < 0) {
		new_leftmost = 0;
	}

	reposition_and_zoom (new_leftmost, new_fpu);
}

void
Editor::temporal_zoom_to_frame (bool coarser, framepos_t frame)
{
	if (!_session) {
		return;
	}
	double range_before = frame - leftmost_frame;
	double new_fpu;

	new_fpu = frames_per_unit;

	if (coarser) {
		new_fpu *= 1.61803399;
		range_before *= 1.61803399;
	} else {
		new_fpu = max(1.0,(new_fpu/1.61803399));
		range_before /= 1.61803399;
	}

	if (new_fpu == frames_per_unit)  {
		return;
	}

	framepos_t new_leftmost = frame - (framepos_t)range_before;

	if (new_leftmost > frame) {
		new_leftmost = 0;
	}

	if (new_leftmost < 0) {
		new_leftmost = 0;
	}

	reposition_and_zoom (new_leftmost, new_fpu);
}


bool
Editor::choose_new_marker_name(string &name) {

	if (!Config->get_name_new_markers()) {
		/* don't prompt user for a new name */
		return true;
	}

	ArdourPrompter dialog (true);

	dialog.set_prompt (_("New Name:"));

	dialog.set_title (_("New Location Marker"));

	dialog.set_name ("MarkNameWindow");
	dialog.set_size_request (250, -1);
	dialog.set_position (Gtk::WIN_POS_MOUSE);

	dialog.add_button (Stock::OK, RESPONSE_ACCEPT);
	dialog.set_initial_text (name);

	dialog.show ();

	switch (dialog.run ()) {
	case RESPONSE_ACCEPT:
		break;
	default:
		return false;
	}

	dialog.get_result(name);
	return true;

}


void
Editor::add_location_from_selection ()
{
	string rangename;

	if (selection->time.empty()) {
		return;
	}

	if (_session == 0 || clicked_axisview == 0) {
		return;
	}

	framepos_t start = selection->time[clicked_selection].start;
	framepos_t end = selection->time[clicked_selection].end;

	_session->locations()->next_available_name(rangename,"selection");
	Location *location = new Location (*_session, start, end, rangename, Location::IsRangeMarker);

	_session->begin_reversible_command (_("add marker"));
	XMLNode &before = _session->locations()->get_state();
	_session->locations()->add (location, true);
	XMLNode &after = _session->locations()->get_state();
	_session->add_command(new MementoCommand<Locations>(*(_session->locations()), &before, &after));
	_session->commit_reversible_command ();
}

void
Editor::add_location_mark (framepos_t where)
{
	string markername;

	select_new_marker = true;

	_session->locations()->next_available_name(markername,"mark");
	if (!choose_new_marker_name(markername)) {
		return;
	}
	Location *location = new Location (*_session, where, where, markername, Location::IsMark);
	_session->begin_reversible_command (_("add marker"));
	XMLNode &before = _session->locations()->get_state();
	_session->locations()->add (location, true);
	XMLNode &after = _session->locations()->get_state();
	_session->add_command(new MementoCommand<Locations>(*(_session->locations()), &before, &after));
	_session->commit_reversible_command ();
}

void
Editor::add_location_from_playhead_cursor ()
{
	add_location_mark (_session->audible_frame());
}

/** Add a range marker around each selected region */
void
Editor::add_locations_from_region ()
{
	RegionSelection rs = get_regions_from_selection_and_entered ();

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

	_session->begin_reversible_command (selection->regions.size () > 1 ? _("add markers") : _("add marker"));
	XMLNode &before = _session->locations()->get_state();

	for (RegionSelection::iterator i = rs.begin (); i != rs.end (); ++i) {

		boost::shared_ptr<Region> region = (*i)->region ();

		Location *location = new Location (*_session, region->position(), region->last_frame(), region->name(), Location::IsRangeMarker);

		_session->locations()->add (location, true);
	}

	XMLNode &after = _session->locations()->get_state();
	_session->add_command (new MementoCommand<Locations>(*(_session->locations()), &before, &after));
	_session->commit_reversible_command ();
}

/** Add a single range marker around all selected regions */
void
Editor::add_location_from_region ()
{
	RegionSelection rs = get_regions_from_selection_and_entered ();

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

	_session->begin_reversible_command (_("add marker"));
	XMLNode &before = _session->locations()->get_state();

	string markername;

	if (rs.size() > 1) {
		_session->locations()->next_available_name(markername, "regions");
	} else {
		RegionView* rv = *(rs.begin());
		boost::shared_ptr<Region> region = rv->region();
		markername = region->name();
	}

	if (!choose_new_marker_name(markername)) {
		return;
	}

	// single range spanning all selected
	Location *location = new Location (*_session, selection->regions.start(), selection->regions.end_frame(), markername, Location::IsRangeMarker);
	_session->locations()->add (location, true);

	XMLNode &after = _session->locations()->get_state();
	_session->add_command (new MementoCommand<Locations>(*(_session->locations()), &before, &after));
	_session->commit_reversible_command ();
}

/* MARKS */

void
Editor::jump_forward_to_mark ()
{
	if (!_session) {
		return;
	}

	framepos_t pos = _session->locations()->first_mark_after (playhead_cursor->current_frame);

	if (pos < 0) {
		return;
	}
	
	_session->request_locate (pos, _session->transport_rolling());
}

void
Editor::jump_backward_to_mark ()
{
	if (!_session) {
		return;
	}

	framepos_t pos = _session->locations()->first_mark_before (playhead_cursor->current_frame);

	if (pos < 0) {
		return;
	}

	_session->request_locate (pos, _session->transport_rolling());
}

void
Editor::set_mark ()
{
	framepos_t const pos = _session->audible_frame ();

	string markername;
	_session->locations()->next_available_name (markername, "mark");

	if (!choose_new_marker_name (markername)) {
		return;
	}

	_session->locations()->add (new Location (*_session, pos, 0, markername, Location::IsMark), true);
}

void
Editor::clear_markers ()
{
	if (_session) {
		_session->begin_reversible_command (_("clear markers"));
		XMLNode &before = _session->locations()->get_state();
		_session->locations()->clear_markers ();
		XMLNode &after = _session->locations()->get_state();
		_session->add_command(new MementoCommand<Locations>(*(_session->locations()), &before, &after));
		_session->commit_reversible_command ();
	}
}

void
Editor::clear_ranges ()
{
	if (_session) {
		_session->begin_reversible_command (_("clear ranges"));
		XMLNode &before = _session->locations()->get_state();

		Location * looploc = _session->locations()->auto_loop_location();
		Location * punchloc = _session->locations()->auto_punch_location();
		Location * sessionloc = _session->locations()->session_range_location();

		_session->locations()->clear_ranges ();
		// re-add these
		if (looploc) _session->locations()->add (looploc);
		if (punchloc) _session->locations()->add (punchloc);
		if (sessionloc) _session->locations()->add (sessionloc);

		XMLNode &after = _session->locations()->get_state();
		_session->add_command(new MementoCommand<Locations>(*(_session->locations()), &before, &after));
		_session->commit_reversible_command ();
	}
}

void
Editor::clear_locations ()
{
	_session->begin_reversible_command (_("clear locations"));
	XMLNode &before = _session->locations()->get_state();
	_session->locations()->clear ();
	XMLNode &after = _session->locations()->get_state();
	_session->add_command(new MementoCommand<Locations>(*(_session->locations()), &before, &after));
	_session->commit_reversible_command ();
	_session->locations()->clear ();
}

void
Editor::unhide_markers ()
{
	for (LocationMarkerMap::iterator i = location_markers.begin(); i != location_markers.end(); ++i) {
		Location *l = (*i).first;
		if (l->is_hidden() && l->is_mark()) {
			l->set_hidden(false, this);
		}
	}
}

void
Editor::unhide_ranges ()
{
	for (LocationMarkerMap::iterator i = location_markers.begin(); i != location_markers.end(); ++i) {
		Location *l = (*i).first;
		if (l->is_hidden() && l->is_range_marker()) {
			l->set_hidden(false, this);
		}
	}
}

/* INSERT/REPLACE */

void
Editor::insert_region_list_drag (boost::shared_ptr<Region> region, int x, int y)
{
	double wx, wy;
	double cx, cy;
	framepos_t where;
	RouteTimeAxisView *rtv = 0;
	boost::shared_ptr<Playlist> playlist;

	track_canvas->window_to_world (x, y, wx, wy);

	GdkEvent event;
	event.type = GDK_BUTTON_RELEASE;
	event.button.x = wx;
	event.button.y = wy;

	where = event_frame (&event, &cx, &cy);

	if (where < leftmost_frame || where > leftmost_frame + current_page_frames()) {
		/* clearly outside canvas area */
		return;
	}

	std::pair<TimeAxisView*, int> tv = trackview_by_y_position (cy);
	if (tv.first == 0) {
		return;
	}

	if ((rtv = dynamic_cast<RouteTimeAxisView*> (tv.first)) == 0) {
		return;
	}

	if ((playlist = rtv->playlist()) == 0) {
		return;
	}

	snap_to (where);

	begin_reversible_command (_("insert dragged region"));
	playlist->clear_changes ();
	playlist->add_region (RegionFactory::create (region, true), where, 1.0);
	_session->add_command(new StatefulDiffCommand (playlist));
	commit_reversible_command ();
}

void
Editor::insert_route_list_drag (boost::shared_ptr<Route> route, int x, int y)
{
	double wx, wy;
	double cx, cy;
	RouteTimeAxisView *dest_rtv = 0;
	RouteTimeAxisView *source_rtv = 0;

	track_canvas->window_to_world (x, y, wx, wy);
	wx += horizontal_position ();
	wy += vertical_adjustment.get_value();

	GdkEvent event;
	event.type = GDK_BUTTON_RELEASE;
	event.button.x = wx;
	event.button.y = wy;

	event_frame (&event, &cx, &cy);

	std::pair<TimeAxisView*, int> const tv = trackview_by_y_position (cy);
	if (tv.first == 0) {
		return;
	}

	if ((dest_rtv = dynamic_cast<RouteTimeAxisView*> (tv.first)) == 0) {
		return;
	}

	/* use this drag source to add underlay to a track. But we really don't care
	   about the Route, only the view of the route, so find it first */
	for(TrackViewList::iterator it = track_views.begin(); it != track_views.end(); ++it) {
		if((source_rtv = dynamic_cast<RouteTimeAxisView*>(*it)) == 0) {
			continue;
		}

		if(source_rtv->route() == route && source_rtv != dest_rtv) {
			dest_rtv->add_underlay(source_rtv->view());
			break;
		}
	}
}

void
Editor::insert_region_list_selection (float times)
{
	RouteTimeAxisView *tv = 0;
	boost::shared_ptr<Playlist> playlist;

	if (clicked_routeview != 0) {
		tv = clicked_routeview;
	} else if (!selection->tracks.empty()) {
		if ((tv = dynamic_cast<RouteTimeAxisView*>(selection->tracks.front())) == 0) {
			return;
		}
	} else if (entered_track != 0) {
		if ((tv = dynamic_cast<RouteTimeAxisView*>(entered_track)) == 0) {
			return;
		}
	} else {
		return;
	}

	if ((playlist = tv->playlist()) == 0) {
		return;
	}

	boost::shared_ptr<Region> region = _regions->get_single_selection ();
	if (region == 0) {
		return;
	}

	begin_reversible_command (_("insert region"));
	playlist->clear_changes ();
	playlist->add_region ((RegionFactory::create (region, true)), get_preferred_edit_position(), times);
	_session->add_command(new StatefulDiffCommand (playlist));
	commit_reversible_command ();
}

/* BUILT-IN EFFECTS */

void
Editor::reverse_selection ()
{

}

/* GAIN ENVELOPE EDITING */

void
Editor::edit_envelope ()
{
}

/* PLAYBACK */

void
Editor::transition_to_rolling (bool fwd)
{
	if (!_session) {
		return;
	}

	if (_session->config.get_external_sync()) {
		switch (Config->get_sync_source()) {
		case JACK:
			break;
		default:
			/* transport controlled by the master */
			return;
		}
	}

	if (_session->is_auditioning()) {
		_session->cancel_audition ();
		return;
	}

	_session->request_transport_speed (fwd ? 1.0f : -1.0f);
}

void
Editor::play_from_start ()
{
	_session->request_locate (_session->current_start_frame(), true);
}

void
Editor::play_from_edit_point ()
{
	_session->request_locate (get_preferred_edit_position(), true);
}

void
Editor::play_from_edit_point_and_return ()
{
	framepos_t start_frame;
	framepos_t return_frame;

	start_frame = get_preferred_edit_position (true);

	if (_session->transport_rolling()) {
		_session->request_locate (start_frame, false);
		return;
	}

	/* don't reset the return frame if its already set */

	if ((return_frame = _session->requested_return_frame()) < 0) {
		return_frame = _session->audible_frame();
	}

	if (start_frame >= 0) {
		_session->request_roll_at_and_return (start_frame, return_frame);
	}
}

void
Editor::play_selection ()
{
	if (selection->time.empty()) {
		return;
	}

	_session->request_play_range (&selection->time, true);
}

framepos_t
Editor::get_preroll ()
{
	return 1.0 /*Config->get_edit_preroll_seconds()*/ * _session->frame_rate();
}


void
Editor::maybe_locate_with_edit_preroll ( framepos_t location )
{
	if ( _session->transport_rolling() || !Config->get_always_play_range() )
		return;

	location -= get_preroll();
	
	//don't try to locate before the beginning of time
	if ( location < 0 ) 
		location = 0;
		
	//if follow_playhead is on, keep the playhead on the screen
	if ( _follow_playhead )
		if ( location < leftmost_frame ) 
			location = leftmost_frame;

	_session->request_locate( location );
}

void
Editor::play_with_preroll ()
{
	if (selection->time.empty()) {
		return;
	} else {
		framepos_t preroll = get_preroll();
		
		framepos_t start = 0;
		if (selection->time[clicked_selection].start > preroll)
			start = selection->time[clicked_selection].start - preroll;
		
		framepos_t end = selection->time[clicked_selection].end + preroll;
		
		AudioRange ar (start, end, 0);
		list<AudioRange> lar;
		lar.push_back (ar);

		_session->request_play_range (&lar, true);
	}
}

void
Editor::play_location (Location& location)
{
	if (location.start() <= location.end()) {
		return;
	}

	_session->request_bounded_roll (location.start(), location.end());
}

void
Editor::loop_location (Location& location)
{
	if (location.start() <= location.end()) {
		return;
	}

	Location* tll;

	if ((tll = transport_loop_location()) != 0) {
		tll->set (location.start(), location.end());

		// enable looping, reposition and start rolling
		_session->request_play_loop (true);
		_session->request_locate (tll->start(), true);
	}
}

void
Editor::do_layer_operation (LayerOperation op)
{
	if (selection->regions.empty ()) {
		return;
	}

	bool const multiple = selection->regions.size() > 1;
	switch (op) {
	case Raise:
		if (multiple) {
			begin_reversible_command (_("raise regions"));
		} else {
			begin_reversible_command (_("raise region"));
		}
		break;

	case RaiseToTop:
		if (multiple) {
			begin_reversible_command (_("raise regions to top"));
		} else {
			begin_reversible_command (_("raise region to top"));
		}
		break;
		
	case Lower:
		if (multiple) {
			begin_reversible_command (_("lower regions"));
		} else {
			begin_reversible_command (_("lower region"));
		}
		break;
		
	case LowerToBottom:
		if (multiple) {
			begin_reversible_command (_("lower regions to bottom"));
		} else {
			begin_reversible_command (_("lower region"));
		}
		break;
	}

	set<boost::shared_ptr<Playlist> > playlists = selection->regions.playlists ();
	for (set<boost::shared_ptr<Playlist> >::iterator i = playlists.begin(); i != playlists.end(); ++i) {
		(*i)->clear_owned_changes ();
	}
	
	for (RegionSelection::iterator i = selection->regions.begin(); i != selection->regions.end(); ++i) {
		boost::shared_ptr<Region> r = (*i)->region ();
		switch (op) {
		case Raise:
			r->raise ();
			break;
		case RaiseToTop:
			r->raise_to_top ();
			break;
		case Lower:
			r->lower ();
			break;
		case LowerToBottom:
			r->lower_to_bottom ();
		}
	}

	for (set<boost::shared_ptr<Playlist> >::iterator i = playlists.begin(); i != playlists.end(); ++i) {
		vector<Command*> cmds;
		(*i)->rdiff (cmds);
		_session->add_commands (cmds);
	}
	
	commit_reversible_command ();
}

void
Editor::raise_region ()
{
	do_layer_operation (Raise);
}

void
Editor::raise_region_to_top ()
{
	do_layer_operation (RaiseToTop);
}

void
Editor::lower_region ()
{
	do_layer_operation (Lower);
}

void
Editor::lower_region_to_bottom ()
{
	do_layer_operation (LowerToBottom);
}

/** Show the region editor for the selected regions */
void
Editor::show_region_properties ()
{
	selection->foreach_regionview (&RegionView::show_region_editor);
}

/** Show the midi list editor for the selected MIDI regions */
void
Editor::show_midi_list_editor ()
{
	selection->foreach_midi_regionview (&MidiRegionView::show_list_editor);
}

void
Editor::rename_region ()
{
	RegionSelection rs = get_regions_from_selection_and_entered ();

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

	ArdourDialog d (*this, _("Rename Region"), true, false);
	Entry entry;
	Label label (_("New name:"));
	HBox hbox;

	hbox.set_spacing (6);
	hbox.pack_start (label, false, false);
	hbox.pack_start (entry, true, true);

	d.get_vbox()->set_border_width (12);
	d.get_vbox()->pack_start (hbox, false, false);

	d.add_button(Gtk::Stock::CANCEL, Gtk::RESPONSE_CANCEL);
	d.add_button(Gtk::Stock::OK, Gtk::RESPONSE_OK);

	d.set_size_request (300, -1);

	entry.set_text (rs.front()->region()->name());
	entry.select_region (0, -1);

	entry.signal_activate().connect (sigc::bind (sigc::mem_fun (d, &Dialog::response), RESPONSE_OK));

	d.show_all ();

	entry.grab_focus();

	int const ret = d.run();

	d.hide ();

	if (ret != RESPONSE_OK) {
		return;
	}

	std::string str = entry.get_text();
	strip_whitespace_edges (str);
	if (!str.empty()) {
		rs.front()->region()->set_name (str);
		_regions->redisplay ();
	}
}

void
Editor::audition_playlist_region_via_route (boost::shared_ptr<Region> region, Route& route)
{
	if (_session->is_auditioning()) {
		_session->cancel_audition ();
	}

	// note: some potential for creativity here, because region doesn't
	// have to belong to the playlist that Route is handling

	// bool was_soloed = route.soloed();

	route.set_solo (true, this);

	_session->request_bounded_roll (region->position(), region->position() + region->length());

	/* XXX how to unset the solo state ? */
}

/** Start an audition of the first selected region */
void
Editor::play_edit_range ()
{
	framepos_t start, end;

	if (get_edit_op_range (start, end)) {
		_session->request_bounded_roll (start, end);
	}
}

void
Editor::play_selected_region ()
{
	framepos_t start = max_framepos;
	framepos_t end = 0;

	RegionSelection rs = get_regions_from_selection_and_entered ();

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

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
		if ((*i)->region()->position() < start) {
			start = (*i)->region()->position();
		}
		if ((*i)->region()->last_frame() + 1 > end) {
			end = (*i)->region()->last_frame() + 1;
		}
	}

	_session->request_bounded_roll (start, end);
}

void
Editor::audition_playlist_region_standalone (boost::shared_ptr<Region> region)
{
	_session->audition_region (region);
}

void
Editor::region_from_selection ()
{
	if (clicked_axisview == 0) {
		return;
	}

	if (selection->time.empty()) {
		return;
	}

	framepos_t start = selection->time[clicked_selection].start;
	framepos_t end = selection->time[clicked_selection].end;

	TrackViewList tracks = get_tracks_for_range_action ();

	framepos_t selection_cnt = end - start + 1;

	for (TrackSelection::iterator i = tracks.begin(); i != tracks.end(); ++i) {
		boost::shared_ptr<Region> current;
		boost::shared_ptr<Playlist> pl;
		framepos_t internal_start;
		string new_name;

		if ((pl = (*i)->playlist()) == 0) {
			continue;
		}

		if ((current = pl->top_region_at (start)) == 0) {
			continue;
		}

		internal_start = start - current->position();
		RegionFactory::region_name (new_name, current->name(), true);

		PropertyList plist;

		plist.add (ARDOUR::Properties::start, current->start() + internal_start);
		plist.add (ARDOUR::Properties::length, selection_cnt);
		plist.add (ARDOUR::Properties::name, new_name);
		plist.add (ARDOUR::Properties::layer, 0);

		boost::shared_ptr<Region> region (RegionFactory::create (current, plist));
	}
}

void
Editor::create_region_from_selection (vector<boost::shared_ptr<Region> >& new_regions)
{
	if (selection->time.empty() || selection->tracks.empty()) {
		return;
	}

	framepos_t start = selection->time[clicked_selection].start;
	framepos_t end = selection->time[clicked_selection].end;

	TrackViewList ts = selection->tracks.filter_to_unique_playlists ();
	sort_track_selection (ts);

	for (TrackSelection::iterator i = ts.begin(); i != ts.end(); ++i) {
		boost::shared_ptr<Region> current;
		boost::shared_ptr<Playlist> playlist;
		framepos_t internal_start;
		string new_name;

		if ((playlist = (*i)->playlist()) == 0) {
			continue;
		}

		if ((current = playlist->top_region_at(start)) == 0) {
			continue;
		}

		internal_start = start - current->position();
		RegionFactory::region_name (new_name, current->name(), true);

		PropertyList plist;

		plist.add (ARDOUR::Properties::start, current->start() + internal_start);
		plist.add (ARDOUR::Properties::length, end - start + 1);
		plist.add (ARDOUR::Properties::name, new_name);

		new_regions.push_back (RegionFactory::create (current, plist));
	}
}

void
Editor::split_multichannel_region ()
{
	RegionSelection rs = get_regions_from_selection_and_entered ();

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

	vector< boost::shared_ptr<Region> > v;

	for (list<RegionView*>::iterator x = rs.begin(); x != rs.end(); ++x) {
		(*x)->region()->separate_by_channel (*_session, v);
	}
}

void
Editor::new_region_from_selection ()
{
	region_from_selection ();
	cancel_selection ();
}

static void
add_if_covered (RegionView* rv, const AudioRange* ar, RegionSelection* rs)
{
	switch (rv->region()->coverage (ar->start, ar->end - 1)) {
	case Evoral::OverlapNone:
		break;
	default:
		rs->push_back (rv);
	}
}

/** Return either:
 *    - selected tracks, or if there are none...
 *    - tracks containing selected regions, or if there are none...
 *    - all tracks
 * @return tracks.
 */
TrackViewList
Editor::get_tracks_for_range_action () const
{
	TrackViewList t;

	if (selection->tracks.empty()) {

		/* use tracks with selected regions */

		RegionSelection rs = selection->regions;

		for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
			TimeAxisView* tv = &(*i)->get_time_axis_view();

			if (!t.contains (tv)) {
				t.push_back (tv);
			}
		}

		if (t.empty()) {
			/* no regions and no tracks: use all tracks */
			t = track_views;
		}

	} else {

		t = selection->tracks;
	}

	return t.filter_to_unique_playlists();
}

void
Editor::separate_regions_between (const TimeSelection& ts)
{
	bool in_command = false;
	boost::shared_ptr<Playlist> playlist;
	RegionSelection new_selection;

	TrackViewList tmptracks = get_tracks_for_range_action ();
	sort_track_selection (tmptracks);

	for (TrackSelection::iterator i = tmptracks.begin(); i != tmptracks.end(); ++i) {

		RouteTimeAxisView* rtv;

		if ((rtv = dynamic_cast<RouteTimeAxisView*> ((*i))) != 0) {

			if (rtv->is_track()) {

				/* no edits to destructive tracks */

				if (rtv->track()->destructive()) {
					continue;
				}

				if ((playlist = rtv->playlist()) != 0) {

					playlist->clear_changes ();

					/* XXX need to consider musical time selections here at some point */

					double speed = rtv->track()->speed();


					for (list<AudioRange>::const_iterator t = ts.begin(); t != ts.end(); ++t) {

						sigc::connection c = rtv->view()->RegionViewAdded.connect (
								sigc::mem_fun(*this, &Editor::collect_new_region_view));

						latest_regionviews.clear ();

						playlist->partition ((framepos_t)((*t).start * speed),
								(framepos_t)((*t).end * speed), false);

						c.disconnect ();

						if (!latest_regionviews.empty()) {

							rtv->view()->foreach_regionview (sigc::bind (
										sigc::ptr_fun (add_if_covered),
										&(*t), &new_selection));

							if (!in_command) {
								begin_reversible_command (_("separate"));
								in_command = true;
							}

							/* pick up changes to existing regions */

							vector<Command*> cmds;
							playlist->rdiff (cmds);
							_session->add_commands (cmds);

							/* pick up changes to the playlist itself (adds/removes)
							 */

							_session->add_command(new StatefulDiffCommand (playlist));
						}
					}
				}
			}
		}
	}

	if (in_command)	{
		selection->set (new_selection);
		set_mouse_mode (MouseObject);

		commit_reversible_command ();
	}
}

struct PlaylistState {
    boost::shared_ptr<Playlist> playlist;
    XMLNode*  before;
};

/** Take tracks from get_tracks_for_range_action and cut any regions
 *  on those tracks so that the tracks are empty over the time
 *  selection.
 */
void
Editor::separate_region_from_selection ()
{
	/* preferentially use *all* ranges in the time selection if we're in range mode
	   to allow discontiguous operation, since get_edit_op_range() currently
	   returns a single range.
	*/

	if (!selection->time.empty()) {

		separate_regions_between (selection->time);

	} else {

		framepos_t start;
		framepos_t end;

		if (get_edit_op_range (start, end)) {

			AudioRange ar (start, end, 1);
			TimeSelection ts;
			ts.push_back (ar);

			separate_regions_between (ts);
		}
	}
}

void
Editor::separate_region_from_punch ()
{
	Location* loc  = _session->locations()->auto_punch_location();
	if (loc) {
		separate_regions_using_location (*loc);
	}
}

void
Editor::separate_region_from_loop ()
{
	Location* loc  = _session->locations()->auto_loop_location();
	if (loc) {
		separate_regions_using_location (*loc);
	}
}

void
Editor::separate_regions_using_location (Location& loc)
{
	if (loc.is_mark()) {
		return;
	}

	AudioRange ar (loc.start(), loc.end(), 1);
	TimeSelection ts;

	ts.push_back (ar);

	separate_regions_between (ts);
}

/** Separate regions under the selected region */
void
Editor::separate_under_selected_regions ()
{
	vector<PlaylistState> playlists;

	RegionSelection rs;

	rs = get_regions_from_selection_and_entered();

	if (!_session || rs.empty()) {
		return;
	}

	begin_reversible_command (_("separate region under"));

	list<boost::shared_ptr<Region> > regions_to_remove;

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
		// we can't just remove the region(s) in this loop because
		// this removes them from the RegionSelection, and they thus
		// disappear from underneath the iterator, and the ++i above
		// SEGVs in a puzzling fashion.

		// so, first iterate over the regions to be removed from rs and
		// add them to the regions_to_remove list, and then
		// iterate over the list to actually remove them.

		regions_to_remove.push_back ((*i)->region());
	}

	for (list<boost::shared_ptr<Region> >::iterator rl = regions_to_remove.begin(); rl != regions_to_remove.end(); ++rl) {

		boost::shared_ptr<Playlist> playlist = (*rl)->playlist();

	        if (!playlist) {
			// is this check necessary?
	        	continue;
	        }

		vector<PlaylistState>::iterator i;

		//only take state if this is a new playlist.
		for (i = playlists.begin(); i != playlists.end(); ++i) {
			if ((*i).playlist == playlist) {
				break;
			}
		}

		if (i == playlists.end()) {

			PlaylistState before;
			before.playlist = playlist;
			before.before = &playlist->get_state();

			playlist->freeze ();
			playlists.push_back(before);
		}

		//Partition on the region bounds
		playlist->partition ((*rl)->first_frame() - 1, (*rl)->last_frame() + 1, true);

		//Re-add region that was just removed due to the partition operation
		playlist->add_region( (*rl), (*rl)->first_frame() );
	}

	vector<PlaylistState>::iterator pl;

	for (pl = playlists.begin(); pl != playlists.end(); ++pl) {
		(*pl).playlist->thaw ();
		_session->add_command(new MementoCommand<Playlist>(*(*pl).playlist, (*pl).before, &(*pl).playlist->get_state()));
	}

	commit_reversible_command ();
}

void
Editor::crop_region_to_selection ()
{
	if (!selection->time.empty()) {

		crop_region_to (selection->time.start(), selection->time.end_frame());

	} else {

		framepos_t start;
		framepos_t end;

		if (get_edit_op_range (start, end)) {
			crop_region_to (start, end);
		}
	}

}

void
Editor::crop_region_to (framepos_t start, framepos_t end)
{
	vector<boost::shared_ptr<Playlist> > playlists;
	boost::shared_ptr<Playlist> playlist;
	TrackViewList ts;

	if (selection->tracks.empty()) {
		ts = track_views.filter_to_unique_playlists();
	} else {
		ts = selection->tracks.filter_to_unique_playlists ();
	}

	sort_track_selection (ts);

	for (TrackSelection::iterator i = ts.begin(); i != ts.end(); ++i) {

		RouteTimeAxisView* rtv;

		if ((rtv = dynamic_cast<RouteTimeAxisView*> ((*i))) != 0) {

			boost::shared_ptr<Track> t = rtv->track();

			if (t != 0 && ! t->destructive()) {

				if ((playlist = rtv->playlist()) != 0) {
					playlists.push_back (playlist);
				}
			}
		}
	}

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

	framepos_t the_start;
	framepos_t the_end;
	framepos_t cnt;

	begin_reversible_command (_("trim to selection"));

	for (vector<boost::shared_ptr<Playlist> >::iterator i = playlists.begin(); i != playlists.end(); ++i) {

		boost::shared_ptr<Region> region;

		the_start = start;

		if ((region = (*i)->top_region_at(the_start)) == 0) {
			continue;
		}

		/* now adjust lengths to that we do the right thing
		   if the selection extends beyond the region
		*/

		the_start = max (the_start, (framepos_t) region->position());
		if (max_framepos - the_start < region->length()) {
			the_end = the_start + region->length() - 1;
		} else {
			the_end = max_framepos;
		}
		the_end = min (end, the_end);
		cnt = the_end - the_start + 1;

		region->clear_changes ();
		region->trim_to (the_start, cnt);
		_session->add_command (new StatefulDiffCommand (region));
	}

	commit_reversible_command ();
}

void
Editor::region_fill_track ()
{
	RegionSelection rs = get_regions_from_selection_and_entered ();

	if (!_session || rs.empty()) {
		return;
	}

	framepos_t const end = _session->current_end_frame ();

	begin_reversible_command (Operations::region_fill);

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {

		boost::shared_ptr<Region> region ((*i)->region());

		boost::shared_ptr<Playlist> pl = region->playlist();

		if (end <= region->last_frame()) {
			return;
		}

		double times = (double) (end - region->last_frame()) / (double) region->length();

		if (times == 0) {
			return;
		}

		pl->clear_changes ();
		pl->add_region (RegionFactory::create (region, true), region->last_frame(), times);
		_session->add_command (new StatefulDiffCommand (pl));
	}

	commit_reversible_command ();
}

void
Editor::region_fill_selection ()
{
	if (clicked_routeview == 0 || !clicked_routeview->is_audio_track()) {
		return;
	}

	if (selection->time.empty()) {
		return;
	}

	boost::shared_ptr<Region> region = _regions->get_single_selection ();
	if (region == 0) {
		return;
	}

	framepos_t start = selection->time[clicked_selection].start;
	framepos_t end = selection->time[clicked_selection].end;

	boost::shared_ptr<Playlist> playlist;

	if (selection->tracks.empty()) {
		return;
	}

	framepos_t selection_length = end - start;
	float times = (float)selection_length / region->length();

	begin_reversible_command (Operations::fill_selection);

	TrackViewList ts = selection->tracks.filter_to_unique_playlists ();

	for (TrackViewList::iterator i = ts.begin(); i != ts.end(); ++i) {

		if ((playlist = (*i)->playlist()) == 0) {
			continue;
		}

		playlist->clear_changes ();
		playlist->add_region (RegionFactory::create (region, true), start, times);
		_session->add_command (new StatefulDiffCommand (playlist));
	}

	commit_reversible_command ();
}

void
Editor::set_region_sync_position ()
{
	set_sync_point (get_preferred_edit_position (), get_regions_from_selection_and_edit_point ());
}

void
Editor::set_sync_point (framepos_t where, const RegionSelection& rs)
{
	bool in_command = false;

	for (RegionSelection::const_iterator r = rs.begin(); r != rs.end(); ++r) {

		if (!(*r)->region()->covers (where)) {
			continue;
		}

		boost::shared_ptr<Region> region ((*r)->region());

		if (!in_command) {
			begin_reversible_command (_("set sync point"));
			in_command = true;
		}

		region->clear_changes ();
		region->set_sync_position (where);
		_session->add_command(new StatefulDiffCommand (region));
	}

	if (in_command) {
		commit_reversible_command ();
	}
}

/** Remove the sync positions of the selection */
void
Editor::remove_region_sync ()
{
	RegionSelection rs = get_regions_from_selection_and_entered ();

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

	begin_reversible_command (_("remove region sync"));

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {

		(*i)->region()->clear_changes ();
		(*i)->region()->clear_sync_position ();
		_session->add_command(new StatefulDiffCommand ((*i)->region()));
	}

	commit_reversible_command ();
}

void
Editor::naturalize_region ()
{
	RegionSelection rs = get_regions_from_selection_and_entered ();

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

	if (rs.size() > 1) {
		begin_reversible_command (_("move regions to original position"));
	} else {
		begin_reversible_command (_("move region to original position"));
	}

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
		(*i)->region()->clear_changes ();
		(*i)->region()->move_to_natural_position ();
		_session->add_command (new StatefulDiffCommand ((*i)->region()));
	}

	commit_reversible_command ();
}

void
Editor::align_regions (RegionPoint what)
{
	RegionSelection const rs = get_regions_from_selection_and_edit_point ();

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

	begin_reversible_command (_("align selection"));

	framepos_t const position = get_preferred_edit_position ();

	for (RegionSelection::const_iterator i = rs.begin(); i != rs.end(); ++i) {
		align_region_internal ((*i)->region(), what, position);
	}

	commit_reversible_command ();
}

struct RegionSortByTime {
    bool operator() (const RegionView* a, const RegionView* b) {
	    return a->region()->position() < b->region()->position();
    }
};

void
Editor::align_regions_relative (RegionPoint point)
{
	RegionSelection const rs = get_regions_from_selection_and_edit_point ();

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

	framepos_t const position = get_preferred_edit_position ();

	framepos_t distance = 0;
	framepos_t pos = 0;
	int dir = 1;

	list<RegionView*> sorted;
	rs.by_position (sorted);

	boost::shared_ptr<Region> r ((*sorted.begin())->region());

	switch (point) {
	case Start:
		pos = position;
		if (position > r->position()) {
			distance = position - r->position();
		} else {
			distance = r->position() - position;
			dir = -1;
		}
		break;

	case End:
		if (position > r->last_frame()) {
			distance = position - r->last_frame();
			pos = r->position() + distance;
		} else {
			distance = r->last_frame() - position;
			pos = r->position() - distance;
			dir = -1;
		}
		break;

	case SyncPoint:
		pos = r->adjust_to_sync (position);
		if (pos > r->position()) {
			distance = pos - r->position();
		} else {
			distance = r->position() - pos;
			dir = -1;
		}
		break;
	}

	if (pos == r->position()) {
		return;
	}

	begin_reversible_command (_("align selection (relative)"));

	/* move first one specially */

	r->clear_changes ();
	r->set_position (pos);
	_session->add_command(new StatefulDiffCommand (r));

	/* move rest by the same amount */

	sorted.pop_front();

	for (list<RegionView*>::iterator i = sorted.begin(); i != sorted.end(); ++i) {

		boost::shared_ptr<Region> region ((*i)->region());

		region->clear_changes ();

		if (dir > 0) {
			region->set_position (region->position() + distance);
		} else {
			region->set_position (region->position() - distance);
		}

		_session->add_command(new StatefulDiffCommand (region));

	}

	commit_reversible_command ();
}

void
Editor::align_region (boost::shared_ptr<Region> region, RegionPoint point, framepos_t position)
{
	begin_reversible_command (_("align region"));
	align_region_internal (region, point, position);
	commit_reversible_command ();
}

void
Editor::align_region_internal (boost::shared_ptr<Region> region, RegionPoint point, framepos_t position)
{
	region->clear_changes ();

	switch (point) {
	case SyncPoint:
		region->set_position (region->adjust_to_sync (position));
		break;

	case End:
		if (position > region->length()) {
			region->set_position (position - region->length());
		}
		break;

	case Start:
		region->set_position (position);
		break;
	}

	_session->add_command(new StatefulDiffCommand (region));
}

void
Editor::trim_region_front ()
{
	trim_region (true);
}

void
Editor::trim_region_back ()
{
	trim_region (false);
}

void
Editor::trim_region (bool front)
{
	framepos_t where = get_preferred_edit_position();
	RegionSelection rs = get_regions_from_selection_and_edit_point ();

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

	begin_reversible_command (front ? _("trim front") : _("trim back"));

	for (list<RegionView*>::const_iterator i = rs.by_layer().begin(); i != rs.by_layer().end(); ++i) {
		if (!(*i)->region()->locked()) {

			(*i)->region()->clear_changes ();

			if (front) {
				(*i)->region()->trim_front (where);
				maybe_locate_with_edit_preroll ( where );
			} else {
				(*i)->region()->trim_end (where);
				maybe_locate_with_edit_preroll ( where );
			}

			_session->add_command (new StatefulDiffCommand ((*i)->region()));
		}
	}

	commit_reversible_command ();
}

/** Trim the end of the selected regions to the position of the edit cursor */
void
Editor::trim_region_to_loop ()
{
	Location* loc = _session->locations()->auto_loop_location();
	if (!loc) {
		return;
	}
	trim_region_to_location (*loc, _("trim to loop"));
}

void
Editor::trim_region_to_punch ()
{
	Location* loc = _session->locations()->auto_punch_location();
	if (!loc) {
		return;
	}
	trim_region_to_location (*loc, _("trim to punch"));
}

void
Editor::trim_region_to_location (const Location& loc, const char* str)
{
	RegionSelection rs = get_regions_from_selection_and_entered ();

	begin_reversible_command (str);

	for (RegionSelection::iterator x = rs.begin(); x != rs.end(); ++x) {
		RegionView* rv = (*x);

		/* require region to span proposed trim */
		switch (rv->region()->coverage (loc.start(), loc.end())) {
		case Evoral::OverlapInternal:
			break;
		default:
			continue;
		}

		RouteTimeAxisView* tav = dynamic_cast<RouteTimeAxisView*> (&rv->get_time_axis_view());
		if (!tav) {
			return;
		}

		float speed = 1.0;
		framepos_t start;
		framepos_t end;

		if (tav->track() != 0) {
			speed = tav->track()->speed();
		}

		start = session_frame_to_track_frame (loc.start(), speed);
		end = session_frame_to_track_frame (loc.end(), speed);

		rv->region()->clear_changes ();
		rv->region()->trim_to (start, (end - start));
		_session->add_command(new StatefulDiffCommand (rv->region()));
	}

	commit_reversible_command ();
}

void
Editor::trim_region_to_previous_region_end ()
{
	return trim_to_region(false);
}

void
Editor::trim_region_to_next_region_start ()
{
	return trim_to_region(true);
}

void
Editor::trim_to_region(bool forward)
{
	RegionSelection rs = get_regions_from_selection_and_entered ();

	begin_reversible_command (_("trim to region"));

	boost::shared_ptr<Region> next_region;

	for (RegionSelection::iterator x = rs.begin(); x != rs.end(); ++x) {

		AudioRegionView* arv = dynamic_cast<AudioRegionView*> (*x);

		if (!arv) {
			continue;
		}

		AudioTimeAxisView* atav = dynamic_cast<AudioTimeAxisView*> (&arv->get_time_axis_view());

		if (!atav) {
			return;
		}

		float speed = 1.0;

		if (atav->track() != 0) {
			speed = atav->track()->speed();
		}


		boost::shared_ptr<Region> region = arv->region();
		boost::shared_ptr<Playlist> playlist (region->playlist());

		region->clear_changes ();

		if (forward) {

		    next_region = playlist->find_next_region (region->first_frame(), Start, 1);

		    if (!next_region) {
			continue;
		    }

		    region->trim_end((framepos_t) ( (next_region->first_frame() - 1) * speed));
		    arv->region_changed (PropertyChange (ARDOUR::Properties::length));
		}
		else {

		    next_region = playlist->find_next_region (region->first_frame(), Start, 0);

		    if(!next_region){
			continue;
		    }

		    region->trim_front((framepos_t) ((next_region->last_frame() + 1) * speed));

		    arv->region_changed (ARDOUR::bounds_change);
		}

		_session->add_command(new StatefulDiffCommand (region));
	}

	commit_reversible_command ();
}

void
Editor::unfreeze_route ()
{
	if (clicked_routeview == 0 || !clicked_routeview->is_track()) {
		return;
	}

	clicked_routeview->track()->unfreeze ();
}

void*
Editor::_freeze_thread (void* arg)
{
	return static_cast<Editor*>(arg)->freeze_thread ();
}

void*
Editor::freeze_thread ()
{
	/* create event pool because we may need to talk to the session */
	SessionEvent::create_per_thread_pool ("freeze events", 64);
	/* create per-thread buffers for process() tree to use */
	current_interthread_info->process_thread.get_buffers ();
	clicked_routeview->audio_track()->freeze_me (*current_interthread_info);
	current_interthread_info->done = true;
	current_interthread_info->process_thread.drop_buffers();
	return 0;
}

void
Editor::freeze_route ()
{
	if (!_session) {
		return;
	}

	/* stop transport before we start. this is important */

	_session->request_transport_speed (0.0);
	
	/* wait for just a little while, because the above call is asynchronous */

	::usleep (250000);

	if (clicked_routeview == 0 || !clicked_routeview->is_audio_track()) {
		return;
	}

	if (!clicked_routeview->track()->bounceable (clicked_routeview->track()->main_outs(), true)) {
		MessageDialog d (
			_("This track/bus cannot be frozen because the signal adds or loses channels before reaching the outputs.\n"
			  "This is typically caused by plugins that generate stereo output from mono input or vice versa.")
			);
		d.set_title (_("Cannot freeze"));
		d.run ();
		return;
	}

	if (clicked_routeview->track()->has_external_redirects()) {
		MessageDialog d (string_compose (_("<b>%1</b>\n\nThis track has at least one send/insert/return as part of its signal flow.\n\n"
						   "Freezing will only process the signal as far as the first send/insert/return."),
						 clicked_routeview->track()->name()), true, MESSAGE_INFO, BUTTONS_NONE, true);

		d.add_button (_("Freeze anyway"), Gtk::RESPONSE_OK);
		d.add_button (_("Don't freeze"), Gtk::RESPONSE_CANCEL);
		d.set_title (_("Freeze Limits"));

		int response = d.run ();

		switch (response) {
		case Gtk::RESPONSE_CANCEL:
			return;
		default:
			break;
		}
	}

	InterThreadInfo itt;
	current_interthread_info = &itt;

	InterthreadProgressWindow ipw (current_interthread_info, _("Freeze"), _("Cancel Freeze"));

	pthread_create_and_store (X_("freezer"), &itt.thread, _freeze_thread, this);

	set_canvas_cursor (_cursors->wait);

	while (!itt.done && !itt.cancel) {
		gtk_main_iteration ();
	}

	current_interthread_info = 0;
	set_canvas_cursor (current_canvas_cursor);
}

void
Editor::bounce_range_selection (bool replace, bool enable_processing)
{
	if (selection->time.empty()) {
		return;
	}

	TrackSelection views = selection->tracks;

	for (TrackViewList::iterator i = views.begin(); i != views.end(); ++i) {

		if (enable_processing) {

			RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*> (*i);

			if (rtv && rtv->track() && replace && enable_processing && !rtv->track()->bounceable (rtv->track()->main_outs(), false)) {
				MessageDialog d (
					_("You can't perform this operation because the processing of the signal "
					  "will cause one or more of the tracks to end up with a region with more channels than this track has inputs.\n\n"
					  "You can do this without processing, which is a different operation.")
					);
				d.set_title (_("Cannot bounce"));
				d.run ();
				return;
			}
		}
	}

	framepos_t start = selection->time[clicked_selection].start;
	framepos_t end = selection->time[clicked_selection].end;
	framepos_t cnt = end - start + 1;

	begin_reversible_command (_("bounce range"));

	for (TrackViewList::iterator i = views.begin(); i != views.end(); ++i) {

		RouteTimeAxisView* rtv;

		if ((rtv = dynamic_cast<RouteTimeAxisView*> (*i)) == 0) {
			continue;
		}

		boost::shared_ptr<Playlist> playlist;

		if ((playlist = rtv->playlist()) == 0) {
			return;
		}

		InterThreadInfo itt;

		playlist->clear_changes ();
		playlist->clear_owned_changes ();

		boost::shared_ptr<Region> r;

		if (enable_processing) {
			r = rtv->track()->bounce_range (start, start+cnt, itt, rtv->track()->main_outs(), false);
		} else {
			r = rtv->track()->bounce_range (start, start+cnt, itt, boost::shared_ptr<Processor>(), false);
		}

		if (!r) {
			continue;
		}

		if (replace) {
			list<AudioRange> ranges;
			ranges.push_back (AudioRange (start, start+cnt, 0));
			playlist->cut (ranges); // discard result
			playlist->add_region (r, start);
		}

		vector<Command*> cmds;
		playlist->rdiff (cmds);
		_session->add_commands (cmds);

		_session->add_command (new StatefulDiffCommand (playlist));
	}

	commit_reversible_command ();
}

/** Delete selected regions, automation points or a time range */
void
Editor::delete_ ()
{
	cut_copy (Delete);
}

/** Cut selected regions, automation points or a time range */
void
Editor::cut ()
{
	cut_copy (Cut);
}

/** Copy selected regions, automation points or a time range */
void
Editor::copy ()
{
	cut_copy (Copy);
}


/** @return true if a Cut, Copy or Clear is possible */
bool
Editor::can_cut_copy () const
{
	switch (effective_mouse_mode()) {

	case MouseObject:
		if (!selection->regions.empty() || !selection->points.empty()) {
			return true;
		}
		break;

	case MouseRange:
		if (!selection->time.empty()) {
			return true;
		}
		break;

	default:
		break;
	}

	return false;
}


/** Cut, copy or clear selected regions, automation points or a time range.
 * @param op Operation (Cut, Copy or Clear)
 */
void
Editor::cut_copy (CutCopyOp op)
{
	/* only cancel selection if cut/copy is successful.*/

	string opname;

	switch (op) {
	case Delete:
		opname = _("delete");
		break;
	case Cut:
		opname = _("cut");
		break;
	case Copy:
		opname = _("copy");
		break;
	case Clear:
		opname = _("clear");
		break;
	}

	/* if we're deleting something, and the mouse is still pressed,
	   the thing we started a drag for will be gone when we release
	   the mouse button(s). avoid this. see part 2 at the end of
	   this function.
	*/

	if (op == Delete || op == Cut || op == Clear) {
		if (_drags->active ()) {
			_drags->abort ();
		}
	}

	if ( op != Clear )  //"Delete" doesn't change copy/paste buf
		cut_buffer->clear ();

	if (entered_marker) {

		/* cut/delete op while pointing at a marker */

		bool ignored;
		Location* loc = find_location_from_marker (entered_marker, ignored);

		if (_session && loc) {
			Glib::signal_idle().connect (sigc::bind (sigc::mem_fun(*this, &Editor::really_remove_marker), loc));
		}

		_drags->abort ();
		return;
	}

	if (internal_editing()) {

		switch (effective_mouse_mode()) {
		case MouseObject:
		case MouseRange:
			cut_copy_midi (op);
			break;
		default:
			break;
		}

	} else {

	RegionSelection rs; 

	/* we only want to cut regions if some are selected */

	if (!selection->regions.empty()) {
		rs = selection->regions;
	}

	switch (effective_mouse_mode()) {
/*
 * 		case MouseGain: {
			//find regions's gain line
			AudioRegionView *rview = dynamic_cast<AudioRegionView*>(clicked_regionview);
				AutomationTimeAxisView *tview = dynamic_cast<AutomationTimeAxisView*>(clicked_trackview);
			if (rview) {
				AudioRegionGainLine *line = rview->get_gain_line();
				if (!line) break;
				
				//cut region gain points in the selection
				AutomationList& alist (line->the_list());
				XMLNode &before = alist.get_state();
				AutomationList* what_we_got = 0;
				if ((what_we_got = alist.cut (selection->time.front().start - rview->audio_region()->position(), selection->time.front().end - rview->audio_region()->position())) != 0) {
					session->add_command(new MementoCommand<AutomationList>(alist, &before, &alist.get_state()));
					delete what_we_got;
					what_we_got = 0;
				}
				
				rview->set_envelope_visible(true);
				rview->audio_region()->set_envelope_active(true);
				
			} else if (tview) {
				AutomationLine *line = *(tview->lines.begin());
				if (!line) break;
				
				//cut auto points in the selection
				AutomationList& alist (line->the_list());
				XMLNode &before = alist.get_state();
				AutomationList* what_we_got = 0;
				if ((what_we_got = alist.cut (selection->time.front().start, selection->time.front().end)) != 0) {
					session->add_command(new MementoCommand<AutomationList>(alist, &before, &alist.get_state()));
					delete what_we_got;
					what_we_got = 0;
				}		
			} else
				break;
		} break;
*/			
		case MouseObject: 
		case MouseRange:
			if (!rs.empty() || !selection->points.empty()) {
				begin_reversible_command (opname + _(" objects"));

				if (!rs.empty()) {
					cut_copy_regions (op, rs);
					
					if (op == Cut || op == Delete) {
						selection->clear_regions ();
					}
				}

				if (!selection->points.empty()) {
					cut_copy_points (op);

					if (op == Cut || op == Delete) {
						selection->clear_points ();
					}
				}

				commit_reversible_command ();	
				break;
			} 
			
			if (selection->time.empty()) {
				framepos_t start, end;
				if (!get_edit_op_range (start, end)) {
					return;
				}
				selection->set (start, end);
			}
				
			begin_reversible_command (opname + _(" range"));
			cut_copy_ranges (op);
			commit_reversible_command ();
			
			if (op == Cut || op == Delete) {
				selection->clear_time ();
			}

			break;
			
		default:
			break;
		}
	}

	if (op == Delete || op == Cut || op == Clear) {
		_drags->abort ();
	}
}

struct AutomationRecord {
	AutomationRecord () : state (0) {}
	AutomationRecord (XMLNode* s) : state (s) {}
	
	XMLNode* state; ///< state before any operation
	boost::shared_ptr<Evoral::ControlList> copy; ///< copied events for the cut buffer
};

/** Cut, copy or clear selected automation points.
 *  @param op Operation (Cut, Copy or Clear)
 */
void
Editor::cut_copy_points (CutCopyOp op)
{
	if (selection->points.empty ()) {
		return;
	}

	/* XXX: not ideal, as there may be more than one track involved in the point selection */
	_last_cut_copy_source_track = &selection->points.front()->line().trackview;

	/* Keep a record of the AutomationLists that we end up using in this operation */
	typedef std::map<boost::shared_ptr<AutomationList>, AutomationRecord> Lists;
	Lists lists;

	/* Go through all selected points, making an AutomationRecord for each distinct AutomationList */
	for (PointSelection::iterator i = selection->points.begin(); i != selection->points.end(); ++i) {
		boost::shared_ptr<AutomationList> al = (*i)->line().the_list();
		if (lists.find (al) == lists.end ()) {
			/* We haven't seen this list yet, so make a record for it.  This includes
			   taking a copy of its current state, in case this is needed for undo later.
			*/
			lists[al] = AutomationRecord (&al->get_state ());
		}
	}

	if (op == Cut || op == Copy) {
		/* This operation will involve putting things in the cut buffer, so create an empty
		   ControlList for each of our source lists to put the cut buffer data in.
		*/
		for (Lists::iterator i = lists.begin(); i != lists.end(); ++i) {
			i->second.copy = i->first->create (i->first->parameter ());
		}

		/* Add all selected points to the relevant copy ControlLists */
		for (PointSelection::iterator i = selection->points.begin(); i != selection->points.end(); ++i) {
			boost::shared_ptr<AutomationList> al = (*i)->line().the_list();
			AutomationList::const_iterator j = (*i)->model ();
			lists[al].copy->add ((*j)->when, (*j)->value);
		}

		for (Lists::iterator i = lists.begin(); i != lists.end(); ++i) {
			/* Correct this copy list so that it starts at time 0 */
			double const start = i->second.copy->front()->when;
			for (AutomationList::iterator j = i->second.copy->begin(); j != i->second.copy->end(); ++j) {
				(*j)->when -= start;
			}

			/* And add it to the cut buffer */
			cut_buffer->add (i->second.copy);
		}
	}
		
	if (op == Delete || op == Cut) {
		/* This operation needs to remove things from the main AutomationList, so do that now */
		
		for (Lists::iterator i = lists.begin(); i != lists.end(); ++i) {
			i->first->freeze ();
		}

		/* Remove each selected point from its AutomationList */
		for (PointSelection::iterator i = selection->points.begin(); i != selection->points.end(); ++i) {
			boost::shared_ptr<AutomationList> al = (*i)->line().the_list();
			al->erase ((*i)->model ());
		}

		/* Thaw the lists and add undo records for them */
		for (Lists::iterator i = lists.begin(); i != lists.end(); ++i) {
			boost::shared_ptr<AutomationList> al = i->first;
			al->thaw ();
			_session->add_command (new MementoCommand<AutomationList> (*al.get(), i->second.state, &(al->get_state ())));
		}
	}
}

/** Cut, copy or clear selected automation points.
 * @param op Operation (Cut, Copy or Clear)
 */
void
Editor::cut_copy_midi (CutCopyOp op)
{
	for (MidiRegionSelection::iterator i = selection->midi_regions.begin(); i != selection->midi_regions.end(); ++i) {
		MidiRegionView* mrv = *i;
		mrv->cut_copy_clear (op);
	}
}



struct lt_playlist {
    bool operator () (const PlaylistState& a, const PlaylistState& b) {
	    return a.playlist < b.playlist;
    }
};

struct PlaylistMapping {
    TimeAxisView* tv;
    boost::shared_ptr<Playlist> pl;

    PlaylistMapping (TimeAxisView* tvp) : tv (tvp) {}
};

/** Remove `clicked_regionview' */
void
Editor::remove_clicked_region ()
{
	if (clicked_routeview == 0 || clicked_regionview == 0) {
		return;
	}

	boost::shared_ptr<Playlist> playlist = clicked_routeview->playlist();

	begin_reversible_command (_("remove region"));
	playlist->clear_changes ();
	playlist->clear_owned_changes ();
	playlist->remove_region (clicked_regionview->region());

	/* We might have removed regions, which alters other regions' layering_index,
	   so we need to do a recursive diff here.
	*/
	vector<Command*> cmds;
	playlist->rdiff (cmds);
	_session->add_commands (cmds);
	
	_session->add_command(new StatefulDiffCommand (playlist));
	commit_reversible_command ();
}


/** Remove the selected regions */
void
Editor::remove_selected_regions ()
{
	RegionSelection rs = get_regions_from_selection_and_entered ();

	if (!_session || rs.empty()) {
		return;
	}

	begin_reversible_command (_("remove region"));

	list<boost::shared_ptr<Region> > regions_to_remove;

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
		// we can't just remove the region(s) in this loop because
		// this removes them from the RegionSelection, and they thus
		// disappear from underneath the iterator, and the ++i above
		// SEGVs in a puzzling fashion.

		// so, first iterate over the regions to be removed from rs and
		// add them to the regions_to_remove list, and then
		// iterate over the list to actually remove them.

		regions_to_remove.push_back ((*i)->region());
	}

	vector<boost::shared_ptr<Playlist> > playlists;

	for (list<boost::shared_ptr<Region> >::iterator rl = regions_to_remove.begin(); rl != regions_to_remove.end(); ++rl) {

		boost::shared_ptr<Playlist> playlist = (*rl)->playlist();

	        if (!playlist) {
			// is this check necessary?
	        	continue;
	        }

		/* get_regions_from_selection_and_entered() guarantees that
		   the playlists involved are unique, so there is no need
		   to check here.
		*/

		playlists.push_back (playlist);

		playlist->clear_changes ();
		playlist->clear_owned_changes ();
		playlist->freeze ();
		playlist->remove_region (*rl);
	}

	vector<boost::shared_ptr<Playlist> >::iterator pl;

	for (pl = playlists.begin(); pl != playlists.end(); ++pl) {
		(*pl)->thaw ();

		/* We might have removed regions, which alters other regions' layering_index,
		   so we need to do a recursive diff here.
		*/
		vector<Command*> cmds;
		(*pl)->rdiff (cmds);
		_session->add_commands (cmds);
		
		_session->add_command(new StatefulDiffCommand (*pl));
	}

	commit_reversible_command ();
}

/** Cut, copy or clear selected regions.
 * @param op Operation (Cut, Copy or Clear)
 */
void
Editor::cut_copy_regions (CutCopyOp op, RegionSelection& rs)
{
	/* we can't use a std::map here because the ordering is important, and we can't trivially sort
	   a map when we want ordered access to both elements. i think.
	*/

	vector<PlaylistMapping> pmap;

	framepos_t first_position = max_framepos;

	typedef set<boost::shared_ptr<Playlist> > FreezeList;
	FreezeList freezelist;

	/* get ordering correct before we cut/copy */

	rs.sort_by_position_and_track ();

	for (RegionSelection::iterator x = rs.begin(); x != rs.end(); ++x) {

		first_position = min ((framepos_t) (*x)->region()->position(), first_position);

		if (op == Cut || op == Clear || op == Delete) {
			boost::shared_ptr<Playlist> pl = (*x)->region()->playlist();

			if (pl) {
				FreezeList::iterator fl;

				// only take state if this is a new playlist.
				for (fl = freezelist.begin(); fl != freezelist.end(); ++fl) {
					if ((*fl) == pl) {
						break;
					}
				}

				if (fl == freezelist.end()) {
					pl->clear_changes();
					pl->clear_owned_changes ();
					pl->freeze ();
					freezelist.insert (pl);
				}
			}
		}

		TimeAxisView* tv = &(*x)->get_time_axis_view();
		vector<PlaylistMapping>::iterator z;

		for (z = pmap.begin(); z != pmap.end(); ++z) {
			if ((*z).tv == tv) {
				break;
			}
		}

		if (z == pmap.end()) {
			pmap.push_back (PlaylistMapping (tv));
		}
	}

	for (RegionSelection::iterator x = rs.begin(); x != rs.end(); ) {

		boost::shared_ptr<Playlist> pl = (*x)->region()->playlist();

		if (!pl) {
			/* region not yet associated with a playlist (e.g. unfinished
			   capture pass.
			*/
			++x;
			continue;
		}

		TimeAxisView& tv = (*x)->get_time_axis_view();
		boost::shared_ptr<Playlist> npl;
		RegionSelection::iterator tmp;

		tmp = x;
		++tmp;

		if (op != Delete) {

			vector<PlaylistMapping>::iterator z;
			
			for (z = pmap.begin(); z != pmap.end(); ++z) {
				if ((*z).tv == &tv) {
					break;
				}
			}
			
			assert (z != pmap.end());
			
			if (!(*z).pl) {
				npl = PlaylistFactory::create (pl->data_type(), *_session, "cutlist", true);
				npl->freeze();
				(*z).pl = npl;
			} else {
				npl = (*z).pl;
			}
		}

		boost::shared_ptr<Region> r = (*x)->region();
		boost::shared_ptr<Region> _xx;

		assert (r != 0);

		switch (op) {
		case Delete:
			pl->remove_region (r);
			break;
			
		case Cut:
			_xx = RegionFactory::create (r);
			npl->add_region (_xx, r->position() - first_position);
			pl->remove_region (r);
			break;

		case Copy:
			/* copy region before adding, so we're not putting same object into two different playlists */
			npl->add_region (RegionFactory::create (r), r->position() - first_position);
			break;

		case Clear:
			pl->remove_region (r);	
			break;
		}

		x = tmp;
	}

	if (op != Delete) {

		list<boost::shared_ptr<Playlist> > foo;
		
		/* the pmap is in the same order as the tracks in which selected regions occured */
		
		for (vector<PlaylistMapping>::iterator i = pmap.begin(); i != pmap.end(); ++i) {
			if ((*i).pl) {
				(*i).pl->thaw();
				foo.push_back ((*i).pl);
			}
		}
		
		if (!foo.empty()) {
			cut_buffer->set (foo);
		}
		
		if (pmap.empty()) {
			_last_cut_copy_source_track = 0;
		} else {
			_last_cut_copy_source_track = pmap.front().tv;
		}
	}

	for (FreezeList::iterator pl = freezelist.begin(); pl != freezelist.end(); ++pl) {
		(*pl)->thaw ();

		/* We might have removed regions, which alters other regions' layering_index,
		   so we need to do a recursive diff here.
		*/
		vector<Command*> cmds;
		(*pl)->rdiff (cmds);
		_session->add_commands (cmds);
		
		_session->add_command (new StatefulDiffCommand (*pl));
	}
}

void
Editor::cut_copy_ranges (CutCopyOp op)
{
	TrackViewList ts = selection->tracks.filter_to_unique_playlists ();

	/* Sort the track selection now, so that it if is used, the playlists
	   selected by the calls below to cut_copy_clear are in the order that
	   their tracks appear in the editor.  This makes things like paste
	   of ranges work properly.
	*/

	sort_track_selection (ts);

	if (ts.empty()) {
		if (!entered_track) {
			return;
		}
		ts.push_back (entered_track);
	} 

	for (TrackViewList::iterator i = ts.begin(); i != ts.end(); ++i) {
		(*i)->cut_copy_clear (*selection, op);
	}
}

void
Editor::paste (float times, bool from_context)
{
        DEBUG_TRACE (DEBUG::CutNPaste, "paste to preferred edit pos\n");

	paste_internal (get_preferred_edit_position (false, from_context), times);
}

void
Editor::mouse_paste ()
{
	framepos_t where;
	bool ignored;

	if (!mouse_frame (where, ignored)) {
		return;
	}

	snap_to (where);
	paste_internal (where, 1);
}

void
Editor::paste_internal (framepos_t position, float times)
{
        DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("apparent paste position is %1\n", position));

	if (internal_editing()) {
		if (cut_buffer->midi_notes.empty()) {
			return;
		}
	} else {
		if (cut_buffer->empty()) {
			return;
		}
	}

	if (position == max_framepos) {
		position = get_preferred_edit_position();
                DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("preferred edit position is %1\n", position));
	}

	TrackViewList ts;
	TrackViewList::iterator i;
	size_t nth;

	/* get everything in the correct order */

	if (_edit_point == Editing::EditAtMouse && entered_track) {
		/* With the mouse edit point, paste onto the track under the mouse */
		ts.push_back (entered_track);
	} else if (!selection->tracks.empty()) {
		/* Otherwise, if there are some selected tracks, paste to them */
		ts = selection->tracks.filter_to_unique_playlists ();
		sort_track_selection (ts);
	} else if (_last_cut_copy_source_track) {
		/* Otherwise paste to the track that the cut/copy came from;
		   see discussion in mantis #3333.
		*/
		ts.push_back (_last_cut_copy_source_track);
	}

	if (internal_editing ()) {

		/* undo/redo is handled by individual tracks/regions */

		for (nth = 0, i = ts.begin(); i != ts.end(); ++i, ++nth) {

			RegionSelection rs;
			RegionSelection::iterator r;
			MidiNoteSelection::iterator cb;

			get_regions_at (rs, position, ts);

			for (cb = cut_buffer->midi_notes.begin(), r = rs.begin();
			     cb != cut_buffer->midi_notes.end() && r != rs.end(); ++r) {
				MidiRegionView* mrv = dynamic_cast<MidiRegionView*> (*r);
				if (mrv) {
					mrv->paste (position, times, **cb);
					++cb;
				}
			}
		}

	} else {

		/* we do redo (do you do voodoo?) */

		begin_reversible_command (Operations::paste);

		for (nth = 0, i = ts.begin(); i != ts.end(); ++i, ++nth) {
			(*i)->paste (position, times, *cut_buffer, nth);
		}

		commit_reversible_command ();
	}
}

void
Editor::duplicate_some_regions (RegionSelection& regions, float times)
{
	boost::shared_ptr<Playlist> playlist;
	RegionSelection sel = regions; // clear (below) may  clear the argument list if its the current region selection
	RegionSelection foo;

	framepos_t const start_frame = regions.start ();
	framepos_t const end_frame = regions.end_frame ();

	begin_reversible_command (Operations::duplicate_region);

	selection->clear_regions ();

	for (RegionSelection::iterator i = sel.begin(); i != sel.end(); ++i) {

		boost::shared_ptr<Region> r ((*i)->region());

		TimeAxisView& tv = (*i)->get_time_axis_view();
		RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*> (&tv);
		latest_regionviews.clear ();
		sigc::connection c = rtv->view()->RegionViewAdded.connect (sigc::mem_fun(*this, &Editor::collect_new_region_view));

 		playlist = (*i)->region()->playlist();
		playlist->clear_changes ();
		playlist->duplicate (r, end_frame + (r->first_frame() - start_frame), times);
		_session->add_command(new StatefulDiffCommand (playlist));

		c.disconnect ();

		foo.insert (foo.end(), latest_regionviews.begin(), latest_regionviews.end());
	}

	commit_reversible_command ();

	if (!foo.empty()) {
		selection->set (foo);
	}
}

void
Editor::duplicate_selection (float times)
{
	if (selection->time.empty() || selection->tracks.empty()) {
		return;
	}

	boost::shared_ptr<Playlist> playlist;
	vector<boost::shared_ptr<Region> > new_regions;
	vector<boost::shared_ptr<Region> >::iterator ri;

	create_region_from_selection (new_regions);

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

	begin_reversible_command (_("duplicate selection"));

	ri = new_regions.begin();

	TrackViewList ts = selection->tracks.filter_to_unique_playlists ();

	for (TrackViewList::iterator i = ts.begin(); i != ts.end(); ++i) {
		if ((playlist = (*i)->playlist()) == 0) {
			continue;
		}
		playlist->clear_changes ();
		playlist->duplicate (*ri, selection->time[clicked_selection].end, times);
		_session->add_command (new StatefulDiffCommand (playlist));

		++ri;
		if (ri == new_regions.end()) {
			--ri;
		}
	}

	commit_reversible_command ();
}

/** Reset all selected points to the relevant default value */
void
Editor::reset_point_selection ()
{
	for (PointSelection::iterator i = selection->points.begin(); i != selection->points.end(); ++i) {
		ARDOUR::AutomationList::iterator j = (*i)->model ();
		(*j)->value = (*i)->line().the_list()->default_value ();
	}
}

void
Editor::center_playhead ()
{
	float page = _canvas_width * frames_per_unit;
	center_screen_internal (playhead_cursor->current_frame, page);
}

void
Editor::center_edit_point ()
{
	float page = _canvas_width * frames_per_unit;
	center_screen_internal (get_preferred_edit_position(), page);
}

/** Caller must begin and commit a reversible command */
void
Editor::clear_playlist (boost::shared_ptr<Playlist> playlist)
{
	playlist->clear_changes ();
	playlist->clear ();
	_session->add_command (new StatefulDiffCommand (playlist));
}

void
Editor::nudge_track (bool use_edit, bool forwards)
{
	boost::shared_ptr<Playlist> playlist;
	framepos_t distance;
	framepos_t next_distance;
	framepos_t start;

	if (use_edit) {
		start = get_preferred_edit_position();
	} else {
		start = 0;
	}

	if ((distance = get_nudge_distance (start, next_distance)) == 0) {
		return;
	}

	if (selection->tracks.empty()) {
		return;
	}

	begin_reversible_command (_("nudge track"));

	TrackViewList ts = selection->tracks.filter_to_unique_playlists ();

	for (TrackViewList::iterator i = ts.begin(); i != ts.end(); ++i) {

		if ((playlist = (*i)->playlist()) == 0) {
			continue;
		}

		playlist->clear_changes ();
		playlist->clear_owned_changes ();

		playlist->nudge_after (start, distance, forwards);

		vector<Command*> cmds;

		playlist->rdiff (cmds);
		_session->add_commands (cmds);

		_session->add_command (new StatefulDiffCommand (playlist));
	}

	commit_reversible_command ();
}

void
Editor::remove_last_capture ()
{
	vector<string> choices;
	string prompt;

	if (!_session) {
		return;
	}

	if (Config->get_verify_remove_last_capture()) {
		prompt  = _("Do you really want to destroy the last capture?"
			    "\n(This is destructive and cannot be undone)");

		choices.push_back (_("No, do nothing."));
		choices.push_back (_("Yes, destroy it."));

		Gtkmm2ext::Choice prompter (_("Destroy last capture"), prompt, choices);

		if (prompter.run () == 1) {
			_session->remove_last_capture ();
			_regions->redisplay ();
		}

	} else {
		_session->remove_last_capture();
		_regions->redisplay ();
	}
}

void
Editor::normalize_region ()
{
	if (!_session) {
		return;
	}

	RegionSelection rs = get_regions_from_selection_and_entered ();

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

	NormalizeDialog dialog (rs.size() > 1);

	if (dialog.run () == RESPONSE_CANCEL) {
		return;
	}

	set_canvas_cursor (_cursors->wait);
	gdk_flush ();

	/* XXX: should really only count audio regions here */
	int const regions = rs.size ();

	/* Make a list of the selected audio regions' maximum amplitudes, and also
	   obtain the maximum amplitude of them all.
	*/
	list<double> max_amps;
	double max_amp = 0;
	for (RegionSelection::const_iterator i = rs.begin(); i != rs.end(); ++i) {
		AudioRegionView const * arv = dynamic_cast<AudioRegionView const *> (*i);
		if (arv) {
			dialog.descend (1.0 / regions);
			double const a = arv->audio_region()->maximum_amplitude (&dialog);

			if (a == -1) {
				/* the user cancelled the operation */
				set_canvas_cursor (current_canvas_cursor);
				return;
			}

			max_amps.push_back (a);
			max_amp = max (max_amp, a);
			dialog.ascend ();
		}
	}

	begin_reversible_command (_("normalize"));

	list<double>::const_iterator a = max_amps.begin ();

	for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ++r) {
		AudioRegionView* const arv = dynamic_cast<AudioRegionView*> (*r);
		if (!arv) {
			continue;
		}

		arv->region()->clear_changes ();

		double const amp = dialog.normalize_individually() ? *a : max_amp;

		arv->audio_region()->normalize (amp, dialog.target ());
		_session->add_command (new StatefulDiffCommand (arv->region()));

		++a;
	}

	commit_reversible_command ();
	set_canvas_cursor (current_canvas_cursor);
}


void
Editor::reset_region_scale_amplitude ()
{
	if (!_session) {
		return;
	}

	RegionSelection rs = get_regions_from_selection_and_entered ();

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

	begin_reversible_command ("reset gain");

	for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ++r) {
		AudioRegionView* const arv = dynamic_cast<AudioRegionView*>(*r);
		if (!arv)
			continue;
		arv->region()->clear_changes ();
		arv->audio_region()->set_scale_amplitude (1.0f);
		_session->add_command (new StatefulDiffCommand (arv->region()));
	}

	commit_reversible_command ();
}

void
Editor::adjust_region_gain (bool up)
{
	RegionSelection rs = get_regions_from_selection_and_entered ();

	if (!_session || rs.empty()) {
		return;
	}

	begin_reversible_command ("adjust region gain");

	for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ++r) {
		AudioRegionView* const arv = dynamic_cast<AudioRegionView*>(*r);
		if (!arv) {
			continue;
		}

		arv->region()->clear_changes ();

		double dB = accurate_coefficient_to_dB (arv->audio_region()->scale_amplitude ());

		if (up) {
			dB += 1;
		} else {
			dB -= 1;
		}

		arv->audio_region()->set_scale_amplitude (dB_to_coefficient (dB));
		_session->add_command (new StatefulDiffCommand (arv->region()));
	}

	commit_reversible_command ();
}


void
Editor::reverse_region ()
{
	if (!_session) {
		return;
	}

	Reverse rev (*_session);
	apply_filter (rev, _("reverse regions"));
}

void
Editor::strip_region_silence ()
{
	if (!_session) {
		return;
	}

	RegionSelection rs = get_regions_from_selection_and_entered ();

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

	std::list<RegionView*> audio_only;

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
		AudioRegionView* const arv = dynamic_cast<AudioRegionView*> (*i);
	        if (arv) {
			audio_only.push_back (arv);
		}
	}

	StripSilenceDialog d (_session, audio_only);
	int const r = d.run ();

        d.drop_rects ();

        if (r == Gtk::RESPONSE_OK) {
                ARDOUR::AudioIntervalMap silences;
                d.silences (silences);
		StripSilence s (*_session, silences, d.fade_length());
		apply_filter (s, _("strip silence"), &d);
	}
}

Command*
Editor::apply_midi_note_edit_op_to_region (MidiOperator& op, MidiRegionView& mrv)
{
	Evoral::Sequence<Evoral::MusicalTime>::Notes selected;
	mrv.selection_as_notelist (selected, true);

	vector<Evoral::Sequence<Evoral::MusicalTime>::Notes> v;
	v.push_back (selected);

	framepos_t pos_frames = mrv.midi_region()->position();
	double     pos_beats  = _session->tempo_map().framewalk_to_beats(0, pos_frames);

	return op (mrv.midi_region()->model(), pos_beats, v);
}

void
Editor::apply_midi_note_edit_op (MidiOperator& op)
{
	Command* cmd;

	RegionSelection rs = get_regions_from_selection_and_entered ();

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

	begin_reversible_command (op.name ());

	for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ) {
		RegionSelection::iterator tmp = r;
		++tmp;

		MidiRegionView* const mrv = dynamic_cast<MidiRegionView*> (*r);

		if (mrv) {
			cmd = apply_midi_note_edit_op_to_region (op, *mrv);
			if (cmd) {
				(*cmd)();
				_session->add_command (cmd);
			}
		}

		r = tmp;
	}

	commit_reversible_command ();
}

void
Editor::fork_region ()
{
	RegionSelection rs = get_regions_from_selection_and_entered ();

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

	begin_reversible_command (_("Fork Region(s)"));

	set_canvas_cursor (_cursors->wait);
	gdk_flush ();

	for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ) {
		RegionSelection::iterator tmp = r;
		++tmp;

		MidiRegionView* const mrv = dynamic_cast<MidiRegionView*>(*r);

		if (mrv) {
			boost::shared_ptr<Playlist> playlist = mrv->region()->playlist();
			boost::shared_ptr<MidiRegion> newregion = mrv->midi_region()->clone ();

			playlist->clear_changes ();
			playlist->replace_region (mrv->region(), newregion, mrv->region()->position());
			_session->add_command(new StatefulDiffCommand (playlist));
		}

		r = tmp;
	}

	commit_reversible_command ();

	set_canvas_cursor (current_canvas_cursor);
}

void
Editor::quantize_region ()
{
	int selected_midi_region_cnt = 0;

	if (!_session) {
		return;
	}

	RegionSelection rs = get_regions_from_selection_and_entered ();

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

	for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ++r) {
		MidiRegionView* const mrv = dynamic_cast<MidiRegionView*> (*r);
		if (mrv) {
			selected_midi_region_cnt++;
		}
	}

	if (selected_midi_region_cnt == 0) {
		return;
	}

	QuantizeDialog* qd = new QuantizeDialog (*this);

	qd->present ();
	const int r = qd->run ();
	qd->hide ();

	if (r == Gtk::RESPONSE_OK) {
		Quantize quant (*_session, qd->snap_start(), qd->snap_end(),
				qd->start_grid_size(), qd->end_grid_size(),
				qd->strength(), qd->swing(), qd->threshold());

		apply_midi_note_edit_op (quant);
	}
}

void
Editor::insert_patch_change (bool from_context)
{
	RegionSelection rs = get_regions_from_selection_and_entered ();

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

	const framepos_t p = get_preferred_edit_position (false, from_context);

	/* XXX: bit of a hack; use the MIDNAM from the first selected region;
	   there may be more than one, but the PatchChangeDialog can only offer
	   one set of patch menus.
	*/
	MidiRegionView* first = dynamic_cast<MidiRegionView*> (rs.front ());

	Evoral::PatchChange<Evoral::MusicalTime> empty (0, 0, 0, 0);
        PatchChangeDialog d (0, _session, empty, first->instrument_info(), Gtk::Stock::ADD);

	if (d.run() == RESPONSE_CANCEL) {
		return;
	}

	for (RegionSelection::iterator i = rs.begin (); i != rs.end(); ++i) {
		MidiRegionView* const mrv = dynamic_cast<MidiRegionView*> (*i);
		if (mrv) {
			if (p >= mrv->region()->first_frame() && p <= mrv->region()->last_frame()) {
				mrv->add_patch_change (p - mrv->region()->position(), d.patch ());
			}
		}
	}
}

void
Editor::apply_filter (Filter& filter, string command, ProgressReporter* progress)
{
	RegionSelection rs = get_regions_from_selection_and_entered ();

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

	begin_reversible_command (command);

	set_canvas_cursor (_cursors->wait);
	gdk_flush ();

	int n = 0;
	int const N = rs.size ();

	for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ) {
		RegionSelection::iterator tmp = r;
		++tmp;

		AudioRegionView* const arv = dynamic_cast<AudioRegionView*>(*r);
		if (arv) {
			boost::shared_ptr<Playlist> playlist = arv->region()->playlist();

			if (progress) {
				progress->descend (1.0 / N);
			}

			if (arv->audio_region()->apply (filter, progress) == 0) {

				playlist->clear_changes ();
				playlist->clear_owned_changes ();

				if (filter.results.empty ()) {

					/* no regions returned; remove the old one */
					playlist->remove_region (arv->region ());

				} else {

					std::vector<boost::shared_ptr<Region> >::iterator res = filter.results.begin ();

					/* first region replaces the old one */
					playlist->replace_region (arv->region(), *res, (*res)->position());
					++res;

					/* add the rest */
					while (res != filter.results.end()) {
						playlist->add_region (*res, (*res)->position());
						++res;
					}

				}

				/* We might have removed regions, which alters other regions' layering_index,
				   so we need to do a recursive diff here.
				*/
				vector<Command*> cmds;
				playlist->rdiff (cmds);
				_session->add_commands (cmds);
				
				_session->add_command(new StatefulDiffCommand (playlist));
			} else {
				goto out;
			}

			if (progress) {
				progress->ascend ();
			}
		}

		r = tmp;
		++n;
	}

	commit_reversible_command ();

  out:
	set_canvas_cursor (current_canvas_cursor);
}

void
Editor::external_edit_region ()
{
	/* more to come */
}

void
Editor::reset_region_gain_envelopes ()
{
	RegionSelection rs = get_regions_from_selection_and_entered ();

	if (!_session || rs.empty()) {
		return;
	}

	_session->begin_reversible_command (_("reset region gain"));

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
		AudioRegionView* const arv = dynamic_cast<AudioRegionView*>(*i);
		if (arv) {
			boost::shared_ptr<AutomationList> alist (arv->audio_region()->envelope());
			XMLNode& before (alist->get_state());

			arv->audio_region()->set_default_envelope ();
			_session->add_command (new MementoCommand<AutomationList>(*arv->audio_region()->envelope().get(), &before, &alist->get_state()));
		}
	}

	_session->commit_reversible_command ();
}

void
Editor::set_region_gain_visibility (RegionView* rv)
{
	AudioRegionView* arv = dynamic_cast<AudioRegionView*> (rv);
	if (arv) {
		arv->update_envelope_visibility();
	}
}

void
Editor::set_gain_envelope_visibility ()
{
	if (!_session) {
		return;
	}

	for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
		AudioTimeAxisView* v = dynamic_cast<AudioTimeAxisView*>(*i);
		if (v) {
			v->audio_view()->foreach_regionview (sigc::mem_fun (this, &Editor::set_region_gain_visibility));
		}
	}
}

void
Editor::toggle_gain_envelope_active ()
{
	if (_ignore_region_action) {
		return;
	}

	RegionSelection rs = get_regions_from_selection_and_entered ();

	if (!_session || rs.empty()) {
		return;
	}

	_session->begin_reversible_command (_("region gain envelope active"));

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
		AudioRegionView* const arv = dynamic_cast<AudioRegionView*>(*i);
		if (arv) {
			arv->region()->clear_changes ();
			arv->audio_region()->set_envelope_active (!arv->audio_region()->envelope_active());
			_session->add_command (new StatefulDiffCommand (arv->region()));
		}
	}

	_session->commit_reversible_command ();
}

void
Editor::toggle_region_lock ()
{
	if (_ignore_region_action) {
		return;
	}

	RegionSelection rs = get_regions_from_selection_and_entered ();

	if (!_session || rs.empty()) {
		return;
	}

	_session->begin_reversible_command (_("toggle region lock"));

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
		(*i)->region()->clear_changes ();
		(*i)->region()->set_locked (!(*i)->region()->locked());
		_session->add_command (new StatefulDiffCommand ((*i)->region()));
	}

	_session->commit_reversible_command ();
}

void
Editor::toggle_region_video_lock ()
{
	if (_ignore_region_action) {
		return;
	}

	RegionSelection rs = get_regions_from_selection_and_entered ();

	if (!_session || rs.empty()) {
		return;
	}

	_session->begin_reversible_command (_("Toggle Video Lock"));

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
		(*i)->region()->clear_changes ();
		(*i)->region()->set_video_locked (!(*i)->region()->video_locked());
		_session->add_command (new StatefulDiffCommand ((*i)->region()));
	}

	_session->commit_reversible_command ();
}

void
Editor::toggle_region_lock_style ()
{
	if (_ignore_region_action) {
		return;
	}

	RegionSelection rs = get_regions_from_selection_and_entered ();

	if (!_session || rs.empty()) {
		return;
	}

	_session->begin_reversible_command (_("region lock style"));

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
		(*i)->region()->clear_changes ();
		PositionLockStyle const ns = (*i)->region()->position_lock_style() == AudioTime ? MusicTime : AudioTime;
		(*i)->region()->set_position_lock_style (ns);
		_session->add_command (new StatefulDiffCommand ((*i)->region()));
	}

	_session->commit_reversible_command ();
}

void
Editor::toggle_opaque_region ()
{
	if (_ignore_region_action) {
		return;
	}

	RegionSelection rs = get_regions_from_selection_and_entered ();

	if (!_session || rs.empty()) {
		return;
	}

	_session->begin_reversible_command (_("change region opacity"));

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
		(*i)->region()->clear_changes ();
		(*i)->region()->set_opaque (!(*i)->region()->opaque());
		_session->add_command (new StatefulDiffCommand ((*i)->region()));
	}

	_session->commit_reversible_command ();
}

void
Editor::toggle_record_enable ()
{
	bool new_state = false;
	bool first = true;
	for (TrackSelection::iterator i = selection->tracks.begin(); i != selection->tracks.end(); ++i) {
		RouteTimeAxisView *rtav = dynamic_cast<RouteTimeAxisView *>(*i);
		if (!rtav)
			continue;
		if (!rtav->is_track())
			continue;

		if (first) {
			new_state = !rtav->track()->record_enabled();
			first = false;
		}

		rtav->track()->set_record_enabled (new_state, this);
	}
}

void
Editor::toggle_solo ()
{
	bool new_state = false;
	bool first = true;
	boost::shared_ptr<RouteList> rl (new RouteList);

	for (TrackSelection::iterator i = selection->tracks.begin(); i != selection->tracks.end(); ++i) {
		RouteTimeAxisView *rtav = dynamic_cast<RouteTimeAxisView *>(*i);

		if (!rtav) {
			continue;
		}

		if (first) {
			new_state = !rtav->route()->soloed ();
			first = false;
		}

		rl->push_back (rtav->route());
	}

	_session->set_solo (rl, new_state, Session::rt_cleanup, true);
}

void
Editor::toggle_mute ()
{
	bool new_state = false;
	bool first = true;
	boost::shared_ptr<RouteList> rl (new RouteList);

	for (TrackSelection::iterator i = selection->tracks.begin(); i != selection->tracks.end(); ++i) {
		RouteTimeAxisView *rtav = dynamic_cast<RouteTimeAxisView *>(*i);

		if (!rtav) {
			continue;
		}

		if (first) {
			new_state = !rtav->route()->muted();
			first = false;
		}

		rl->push_back (rtav->route());
	}

	_session->set_mute (rl, new_state, Session::rt_cleanup, true);
}

void
Editor::toggle_solo_isolate ()
{
}

void
Editor::set_fade_length (bool in)
{
	RegionSelection rs = get_regions_from_selection_and_entered ();

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

	/* we need a region to measure the offset from the start */

	RegionView* rv = rs.front ();

	framepos_t pos = get_preferred_edit_position();
	framepos_t len;
	char const * cmd;

	if (pos > rv->region()->last_frame() || pos < rv->region()->first_frame()) {
		/* edit point is outside the relevant region */
		return;
	}

	if (in) {
		if (pos <= rv->region()->position()) {
			/* can't do it */
			return;
		}
		len = pos - rv->region()->position();
		cmd = _("set fade in length");
	} else {
		if (pos >= rv->region()->last_frame()) {
			/* can't do it */
			return;
		}
		len = rv->region()->last_frame() - pos;
		cmd = _("set fade out length");
	}

	begin_reversible_command (cmd);

	for (RegionSelection::iterator x = rs.begin(); x != rs.end(); ++x) {
		AudioRegionView* tmp = dynamic_cast<AudioRegionView*> (*x);

		if (!tmp) {
			return;
		}

		boost::shared_ptr<AutomationList> alist;
		if (in) {
			alist = tmp->audio_region()->fade_in();
		} else {
			alist = tmp->audio_region()->fade_out();
		}

		XMLNode &before = alist->get_state();

		if (in) {
			tmp->audio_region()->set_fade_in_length (len);
			tmp->audio_region()->set_fade_in_active (true);
		} else {
			tmp->audio_region()->set_fade_out_length (len);
			tmp->audio_region()->set_fade_out_active (true);
		}

		XMLNode &after = alist->get_state();
		_session->add_command(new MementoCommand<AutomationList>(*alist, &before, &after));
	}

	commit_reversible_command ();
}

void
Editor::set_fade_in_shape (FadeShape shape)
{
	RegionSelection rs = get_regions_from_selection_and_entered ();

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

	begin_reversible_command (_("set fade in shape"));

	for (RegionSelection::iterator x = rs.begin(); x != rs.end(); ++x) {
		AudioRegionView* tmp = dynamic_cast<AudioRegionView*> (*x);

		if (!tmp) {
			return;
		}

		boost::shared_ptr<AutomationList> alist = tmp->audio_region()->fade_in();
		XMLNode &before = alist->get_state();

		tmp->audio_region()->set_fade_in_shape (shape);

		XMLNode &after = alist->get_state();
		_session->add_command(new MementoCommand<AutomationList>(*alist.get(), &before, &after));
	}

	commit_reversible_command ();

}

void
Editor::set_fade_out_shape (FadeShape shape)
{
	RegionSelection rs = get_regions_from_selection_and_entered ();

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

	begin_reversible_command (_("set fade out shape"));

	for (RegionSelection::iterator x = rs.begin(); x != rs.end(); ++x) {
		AudioRegionView* tmp = dynamic_cast<AudioRegionView*> (*x);

		if (!tmp) {
			return;
		}

		boost::shared_ptr<AutomationList> alist = tmp->audio_region()->fade_out();
		XMLNode &before = alist->get_state();

		tmp->audio_region()->set_fade_out_shape (shape);

		XMLNode &after = alist->get_state();
		_session->add_command(new MementoCommand<AutomationList>(*alist.get(), &before, &after));
	}

	commit_reversible_command ();
}

void
Editor::set_fade_in_active (bool yn)
{
	RegionSelection rs = get_regions_from_selection_and_entered ();

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

	begin_reversible_command (_("set fade in active"));

	for (RegionSelection::iterator x = rs.begin(); x != rs.end(); ++x) {
		AudioRegionView* tmp = dynamic_cast<AudioRegionView*> (*x);

		if (!tmp) {
			return;
		}


		boost::shared_ptr<AudioRegion> ar (tmp->audio_region());

		ar->clear_changes ();
		ar->set_fade_in_active (yn);
		_session->add_command (new StatefulDiffCommand (ar));
	}

	commit_reversible_command ();
}

void
Editor::set_fade_out_active (bool yn)
{
	RegionSelection rs = get_regions_from_selection_and_entered ();

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

	begin_reversible_command (_("set fade out active"));

	for (RegionSelection::iterator x = rs.begin(); x != rs.end(); ++x) {
		AudioRegionView* tmp = dynamic_cast<AudioRegionView*> (*x);

		if (!tmp) {
			return;
		}

		boost::shared_ptr<AudioRegion> ar (tmp->audio_region());

		ar->clear_changes ();
		ar->set_fade_out_active (yn);
		_session->add_command(new StatefulDiffCommand (ar));
	}

	commit_reversible_command ();
}

void
Editor::toggle_region_fades (int dir)
{
	if (_ignore_region_action) {
		return;
	}
	
	boost::shared_ptr<AudioRegion> ar;
	bool yn = false;

	RegionSelection rs = get_regions_from_selection_and_entered ();

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

	RegionSelection::iterator i;
	for (i = rs.begin(); i != rs.end(); ++i) {
		if ((ar = boost::dynamic_pointer_cast<AudioRegion>((*i)->region())) != 0) {
			if (dir == -1) {
				yn = ar->fade_out_active ();
			} else {
				yn = ar->fade_in_active ();
			}
			break;
		}
	}

	if (i == rs.end()) {
		return;
	}

	/* XXX should this undo-able? */

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
		if ((ar = boost::dynamic_pointer_cast<AudioRegion>((*i)->region())) == 0) {
			continue;
		}
		if (dir == 1 || dir == 0) {
			ar->set_fade_in_active (!yn);
		}

		if (dir == -1 || dir == 0) {
			ar->set_fade_out_active (!yn);
		}
	}
}


/** Update region fade visibility after its configuration has been changed */
void
Editor::update_region_fade_visibility ()
{
	bool _fade_visibility = _session->config.get_show_region_fades ();

	for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
		AudioTimeAxisView* v = dynamic_cast<AudioTimeAxisView*>(*i);
		if (v) {
			if (_fade_visibility) {
				v->audio_view()->show_all_fades ();
			} else {
				v->audio_view()->hide_all_fades ();
			}
		}
	}
}

void
Editor::set_edit_point ()
{
	framepos_t where;
	bool ignored;

	if (!mouse_frame (where, ignored)) {
		return;
	}

	snap_to (where);

	if (selection->markers.empty()) {

		mouse_add_new_marker (where);

	} else {
		bool ignored;

		Location* loc = find_location_from_marker (selection->markers.front(), ignored);

		if (loc) {
			loc->move_to (where);
		}
	}
}

void
Editor::set_playhead_cursor ()
{
	if (entered_marker) {
		_session->request_locate (entered_marker->position(), _session->transport_rolling());
	} else {
		framepos_t where;
		bool ignored;

		if (!mouse_frame (where, ignored)) {
			return;
		}

		snap_to (where);

		if (_session) {
			_session->request_locate (where, _session->transport_rolling());
		}
	}

	if ( Config->get_always_play_range() )
		cancel_time_selection();
}

void
Editor::split_region ()
{
	if ( !selection->time.empty()) {
		separate_regions_between (selection->time);
		return;
	}

	RegionSelection rs = get_regions_from_selection_and_edit_point ();

	framepos_t where = get_preferred_edit_position ();

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

	split_regions_at (where, rs);
}

struct EditorOrderRouteSorter {
    bool operator() (boost::shared_ptr<Route> a, boost::shared_ptr<Route> b) {
	    return a->order_key (EditorSort) < b->order_key (EditorSort);
    }
};

void
Editor::select_next_route()
{
	if (selection->tracks.empty()) {
		selection->set (track_views.front());
		return;
	}

	TimeAxisView* current = selection->tracks.front();

	RouteUI *rui;
	do {
		for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
			if (*i == current) {
				++i;
				if (i != track_views.end()) {
					current = (*i);
				} else {
					current = (*(track_views.begin()));
					//selection->set (*(track_views.begin()));
				}
				break;
			}
		}
		rui = dynamic_cast<RouteUI *>(current);
	} while ( current->hidden() || (rui != NULL && !rui->route()->active()));

	selection->set(current);

	ensure_track_visible(current);
}

void
Editor::select_prev_route()
{
	if (selection->tracks.empty()) {
		selection->set (track_views.front());
		return;
	}

	TimeAxisView* current = selection->tracks.front();

	RouteUI *rui;
	do {
		for (TrackViewList::reverse_iterator i = track_views.rbegin(); i != track_views.rend(); ++i) {
			if (*i == current) {
				++i;
				if (i != track_views.rend()) {
					current = (*i);
				} else {
					current = *(track_views.rbegin());
				}
				break;
			}
		}
		rui = dynamic_cast<RouteUI *>(current);
	} while ( current->hidden() || (rui != NULL && !rui->route()->active()));

	selection->set (current);

	ensure_track_visible(current);
}

void
Editor::ensure_track_visible(TimeAxisView *track)
{
	if (track->hidden())
		return;

	double const current_view_min_y = vertical_adjustment.get_value();
	double const current_view_max_y = vertical_adjustment.get_value() + vertical_adjustment.get_page_size() - canvas_timebars_vsize;

	double const track_min_y = track->y_position ();
	double const track_max_y = track->y_position () + track->effective_height ();

	if (track_min_y >= current_view_min_y &&
	    track_max_y <= current_view_max_y) {
		return;
	}

	double new_value;

	if (track_min_y < current_view_min_y) {
		// Track is above the current view
		new_value = track_min_y;
	} else {
		// Track is below the current view
		new_value = track->y_position () + track->effective_height() + canvas_timebars_vsize - vertical_adjustment.get_page_size();
	}

	vertical_adjustment.set_value(new_value);
}

void
Editor::set_loop_from_selection (bool play)
{
	if (_session == 0 || selection->time.empty()) {
		return;
	}

	framepos_t start = selection->time[clicked_selection].start;
	framepos_t end = selection->time[clicked_selection].end;

	set_loop_range (start, end,  _("set loop range from selection"));

	if (play) {
		_session->request_play_loop (true);
		_session->request_locate (start, true);
	}
}

void
Editor::set_loop_from_edit_range (bool play)
{
	if (_session == 0) {
		return;
	}

	framepos_t start;
	framepos_t end;

	if (!get_edit_op_range (start, end)) {
		return;
	}

	set_loop_range (start, end,  _("set loop range from edit range"));

	if (play) {
		_session->request_play_loop (true);
		_session->request_locate (start, true);
	}
}

void
Editor::set_loop_from_region (bool play)
{
	framepos_t start = max_framepos;
	framepos_t end = 0;

	RegionSelection rs = get_regions_from_selection_and_entered ();

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

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
		if ((*i)->region()->position() < start) {
			start = (*i)->region()->position();
		}
		if ((*i)->region()->last_frame() + 1 > end) {
			end = (*i)->region()->last_frame() + 1;
		}
	}

	set_loop_range (start, end, _("set loop range from region"));

	if (play) {
		_session->request_play_loop (true);
		_session->request_locate (start, true);
	}
}

void
Editor::set_punch_from_selection ()
{
	if (_session == 0 || selection->time.empty()) {
		return;
	}

	framepos_t start = selection->time[clicked_selection].start;
	framepos_t end = selection->time[clicked_selection].end;

	set_punch_range (start, end,  _("set punch range from selection"));
}

void
Editor::set_punch_from_edit_range ()
{
	if (_session == 0) {
		return;
	}

	framepos_t start;
	framepos_t end;

	if (!get_edit_op_range (start, end)) {
		return;
	}

	set_punch_range (start, end,  _("set punch range from edit range"));
}

void
Editor::set_punch_from_region ()
{
	framepos_t start = max_framepos;
	framepos_t end = 0;

	RegionSelection rs = get_regions_from_selection_and_entered ();

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

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
		if ((*i)->region()->position() < start) {
			start = (*i)->region()->position();
		}
		if ((*i)->region()->last_frame() + 1 > end) {
			end = (*i)->region()->last_frame() + 1;
		}
	}

	set_punch_range (start, end, _("set punch range from region"));
}

void
Editor::pitch_shift_region ()
{
	RegionSelection rs = get_regions_from_selection_and_entered ();

	RegionSelection audio_rs;
	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
		if (dynamic_cast<AudioRegionView*> (*i)) {
			audio_rs.push_back (*i);
		}
	}

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

	pitch_shift (audio_rs, 1.2);
}

void
Editor::transpose_region ()
{
	RegionSelection rs = get_regions_from_selection_and_entered ();

	list<MidiRegionView*> midi_region_views;
	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
		MidiRegionView* mrv = dynamic_cast<MidiRegionView*> (*i);
		if (mrv) {
			midi_region_views.push_back (mrv);
		}
	}

	TransposeDialog d;
	int const r = d.run ();
	if (r != RESPONSE_ACCEPT) {
		return;
	}

	for (list<MidiRegionView*>::iterator i = midi_region_views.begin(); i != midi_region_views.end(); ++i) {
		(*i)->midi_region()->transpose (d.semitones ());
	}
}

void
Editor::set_tempo_from_region ()
{
	RegionSelection rs = get_regions_from_selection_and_entered ();

	if (!_session || rs.empty()) {
		return;
	}

	RegionView* rv = rs.front();

	define_one_bar (rv->region()->position(), rv->region()->last_frame() + 1);
}

void
Editor::use_range_as_bar ()
{
	framepos_t start, end;
	if (get_edit_op_range (start, end)) {
		define_one_bar (start, end);
	}
}

void
Editor::define_one_bar (framepos_t start, framepos_t end)
{
	framepos_t length = end - start;

	const Meter& m (_session->tempo_map().meter_at (start));

	/* length = 1 bar */

	/* now we want frames per beat.
	   we have frames per bar, and beats per bar, so ...
	*/

	/* XXXX METER MATH */

	double frames_per_beat = length / m.divisions_per_bar();

	/* beats per minute = */

	double beats_per_minute = (_session->frame_rate() * 60.0) / frames_per_beat;

	/* now decide whether to:

	    (a) set global tempo
	    (b) add a new tempo marker

	*/

	const TempoSection& t (_session->tempo_map().tempo_section_at (start));

	bool do_global = false;

	if ((_session->tempo_map().n_tempos() == 1) && (_session->tempo_map().n_meters() == 1)) {

		/* only 1 tempo & 1 meter: ask if the user wants to set the tempo
		   at the start, or create a new marker
		*/

		vector<string> options;
		options.push_back (_("Cancel"));
		options.push_back (_("Add new marker"));
		options.push_back (_("Set global tempo"));

		Choice c (
			_("Define one bar"),
			_("Do you want to set the global tempo or add a new tempo marker?"),
			options
			);

		c.set_default_response (2);

		switch (c.run()) {
		case 0:
			return;

		case 2:
			do_global = true;
			break;

		default:
			do_global = false;
		}

	} else {

		/* more than 1 tempo and/or meter section already, go ahead do the "usual":
		   if the marker is at the region starter, change it, otherwise add
		   a new tempo marker
		*/
	}

	begin_reversible_command (_("set tempo from region"));
	XMLNode& before (_session->tempo_map().get_state());

	if (do_global) {
		_session->tempo_map().change_initial_tempo (beats_per_minute, t.note_type());
	} else if (t.frame() == start) {
		_session->tempo_map().change_existing_tempo_at (start, beats_per_minute, t.note_type());
	} else {
		Timecode::BBT_Time bbt;
		_session->tempo_map().bbt_time (start, bbt);
		_session->tempo_map().add_tempo (Tempo (beats_per_minute, t.note_type()), bbt);
	}

	XMLNode& after (_session->tempo_map().get_state());

	_session->add_command (new MementoCommand<TempoMap>(_session->tempo_map(), &before, &after));
	commit_reversible_command ();
}

void
Editor::split_region_at_transients ()
{
	AnalysisFeatureList positions;

	RegionSelection rs = get_regions_from_selection_and_entered ();

	if (!_session || rs.empty()) {
		return;
	}

	_session->begin_reversible_command (_("split regions"));

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ) {

		RegionSelection::iterator tmp;

		tmp = i;
		++tmp;

		boost::shared_ptr<AudioRegion> ar = boost::dynamic_pointer_cast<AudioRegion> ((*i)->region());

		if (ar && (ar->get_transients (positions) == 0)) {
			split_region_at_points ((*i)->region(), positions, true);
			positions.clear ();
		}

		i = tmp;
	}

	_session->commit_reversible_command ();

}

void
Editor::split_region_at_points (boost::shared_ptr<Region> r, AnalysisFeatureList& positions, bool can_ferret, bool select_new)
{
	bool use_rhythmic_rodent = false;

	boost::shared_ptr<Playlist> pl = r->playlist();

	list<boost::shared_ptr<Region> > new_regions;

	if (!pl) {
		return;
	}

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


	if (positions.size() > 20 && can_ferret) {
		std::string msgstr = string_compose (_("You are about to split\n%1\ninto %2 pieces.\nThis could take a long time."), r->name(), positions.size() + 1);
		MessageDialog msg (msgstr,
				   false,
				   Gtk::MESSAGE_INFO,
				   Gtk::BUTTONS_OK_CANCEL);

		if (can_ferret) {
			msg.add_button (_("Call for the Ferret!"), RESPONSE_APPLY);
			msg.set_secondary_text (_("Press OK to continue with this split operation\nor ask the Ferret dialog to tune the analysis"));
		} else {
			msg.set_secondary_text (_("Press OK to continue with this split operation"));
		}

		msg.set_title (_("Excessive split?"));
		msg.present ();

		int response = msg.run();
		msg.hide ();

		switch (response) {
		case RESPONSE_OK:
			break;
		case RESPONSE_APPLY:
			use_rhythmic_rodent = true;
			break;
		default:
			return;
		}
	}

	if (use_rhythmic_rodent) {
		show_rhythm_ferret ();
		return;
	}

	AnalysisFeatureList::const_iterator x;

	pl->clear_changes ();
	pl->clear_owned_changes ();

	x = positions.begin();

	if (x == positions.end()) {
		return;
	}

	pl->freeze ();
	pl->remove_region (r);

	framepos_t pos = 0;

	while (x != positions.end()) {

		/* deal with positons that are out of scope of present region bounds */
		if (*x <= 0 || *x > r->length()) {
			++x;
			continue;
		}

		/* file start = original start + how far we from the initial position ?
		 */

		framepos_t file_start = r->start() + pos;

		/* length = next position - current position
		 */

		framepos_t len = (*x) - pos;

		/* XXX we do we really want to allow even single-sample regions?
		   shouldn't we have some kind of lower limit on region size?
		*/

		if (len <= 0) {
			break;
		}

		string new_name;

		if (RegionFactory::region_name (new_name, r->name())) {
			break;
		}

		/* do NOT announce new regions 1 by one, just wait till they are all done */

		PropertyList plist;

		plist.add (ARDOUR::Properties::start, file_start);
		plist.add (ARDOUR::Properties::length, len);
		plist.add (ARDOUR::Properties::name, new_name);
		plist.add (ARDOUR::Properties::layer, 0);

		boost::shared_ptr<Region> nr = RegionFactory::create (r->sources(), plist, false);
		/* because we set annouce to false, manually add the new region to the
		   RegionFactory map
		*/
		RegionFactory::map_add (nr);

		pl->add_region (nr, r->position() + pos);

		if (select_new) {
			new_regions.push_front(nr);
		}

		pos += len;
		++x;
	}

	string new_name;

	RegionFactory::region_name (new_name, r->name());

	/* Add the final region */
	PropertyList plist;

	plist.add (ARDOUR::Properties::start, r->start() + pos);
	plist.add (ARDOUR::Properties::length, r->last_frame() - (r->position() + pos) + 1);
	plist.add (ARDOUR::Properties::name, new_name);
	plist.add (ARDOUR::Properties::layer, 0);

	boost::shared_ptr<Region> nr = RegionFactory::create (r->sources(), plist, false);
	/* because we set annouce to false, manually add the new region to the
	   RegionFactory map
	*/
	RegionFactory::map_add (nr);
	pl->add_region (nr, r->position() + pos);

	if (select_new) {
		new_regions.push_front(nr);
	}

	pl->thaw ();

	/* We might have removed regions, which alters other regions' layering_index,
	   so we need to do a recursive diff here.
	*/
	vector<Command*> cmds;
	pl->rdiff (cmds);
	_session->add_commands (cmds);
	
	_session->add_command (new StatefulDiffCommand (pl));

	if (select_new) {

		for (list<boost::shared_ptr<Region> >::iterator i = new_regions.begin(); i != new_regions.end(); ++i){
			set_selected_regionview_from_region_list ((*i), Selection::Add);
		}
	}
}

void
Editor::place_transient()
{
	if (!_session) {
		return;
	}

	RegionSelection rs = get_regions_from_selection_and_edit_point ();

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

	framepos_t where = get_preferred_edit_position();

	_session->begin_reversible_command (_("place transient"));

	for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ++r) {
		framepos_t position = (*r)->region()->position();
		(*r)->region()->add_transient(where - position);
	}

	_session->commit_reversible_command ();
}

void
Editor::remove_transient(ArdourCanvas::Item* item)
{
	if (!_session) {
		return;
	}

	ArdourCanvas::Line* _line = reinterpret_cast<ArdourCanvas::Line*> (item);
	assert (_line);

	AudioRegionView* _arv = reinterpret_cast<AudioRegionView*> (item->get_data ("regionview"));
	_arv->remove_transient (*(float*) _line->get_data ("position"));
}

void
Editor::snap_regions_to_grid ()
{
	list <boost::shared_ptr<Playlist > > used_playlists;

	RegionSelection rs = get_regions_from_selection_and_entered ();

	if (!_session || rs.empty()) {
		return;
	}

	_session->begin_reversible_command (_("snap regions to grid"));

	for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ++r) {

		boost::shared_ptr<Playlist> pl = (*r)->region()->playlist();

		if (!pl->frozen()) {
			/* we haven't seen this playlist before */

			/* remember used playlists so we can thaw them later */
			used_playlists.push_back(pl);
			pl->freeze();
		}

		framepos_t start_frame = (*r)->region()->first_frame ();
		snap_to (start_frame);
		(*r)->region()->set_position (start_frame);
	}

	while (used_playlists.size() > 0) {
		list <boost::shared_ptr<Playlist > >::iterator i = used_playlists.begin();
		(*i)->thaw();
		used_playlists.pop_front();
	}

	_session->commit_reversible_command ();
}

void
Editor::close_region_gaps ()
{
	list <boost::shared_ptr<Playlist > > used_playlists;

	RegionSelection rs = get_regions_from_selection_and_entered ();

	if (!_session || rs.empty()) {
		return;
	}

	Dialog dialog (_("Close Region Gaps"));

	Table table (2, 3);
	table.set_spacings (12);
	table.set_border_width (12);
	Label* l = manage (left_aligned_label (_("Crossfade length")));
	table.attach (*l, 0, 1, 0, 1);

	SpinButton spin_crossfade (1, 0);
	spin_crossfade.set_range (0, 15);
	spin_crossfade.set_increments (1, 1);
	spin_crossfade.set_value (5);
	table.attach (spin_crossfade, 1, 2, 0, 1);

	table.attach (*manage (new Label (_("ms"))), 2, 3, 0, 1);

	l = manage (left_aligned_label (_("Pull-back length")));
	table.attach (*l, 0, 1, 1, 2);

	SpinButton spin_pullback (1, 0);
	spin_pullback.set_range (0, 100);
	spin_pullback.set_increments (1, 1);
	spin_pullback.set_value(30);
	table.attach (spin_pullback, 1, 2, 1, 2);

	table.attach (*manage (new Label (_("ms"))), 2, 3, 1, 2);

	dialog.get_vbox()->pack_start (table);
	dialog.add_button (Stock::CANCEL, RESPONSE_CANCEL);
	dialog.add_button (_("Ok"), RESPONSE_ACCEPT);
	dialog.show_all ();

	if (dialog.run () == RESPONSE_CANCEL) {
		return;
	}

	framepos_t crossfade_len = spin_crossfade.get_value();
	framepos_t pull_back_frames = spin_pullback.get_value();

	crossfade_len = lrintf (crossfade_len * _session->frame_rate()/1000);
	pull_back_frames = lrintf (pull_back_frames * _session->frame_rate()/1000);

	/* Iterate over the region list and make adjacent regions overlap by crossfade_len_ms */

	_session->begin_reversible_command (_("close region gaps"));

	int idx = 0;
	boost::shared_ptr<Region> last_region;

	rs.sort_by_position_and_track();

	for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ++r) {

		boost::shared_ptr<Playlist> pl = (*r)->region()->playlist();

		if (!pl->frozen()) {
			/* we haven't seen this playlist before */

			/* remember used playlists so we can thaw them later */
			used_playlists.push_back(pl);
			pl->freeze();
		}

		framepos_t position = (*r)->region()->position();

		if (idx == 0 || position < last_region->position()){
			last_region = (*r)->region();
			idx++;
			continue;
		}

		(*r)->region()->trim_front( (position - pull_back_frames));
		last_region->trim_end( (position - pull_back_frames + crossfade_len));

		last_region = (*r)->region();

		idx++;
	}

	while (used_playlists.size() > 0) {
		list <boost::shared_ptr<Playlist > >::iterator i = used_playlists.begin();
		(*i)->thaw();
		used_playlists.pop_front();
	}

	_session->commit_reversible_command ();
}

void
Editor::tab_to_transient (bool forward)
{
	AnalysisFeatureList positions;

	RegionSelection rs = get_regions_from_selection_and_entered ();

	if (!_session) {
		return;
	}

	framepos_t pos = _session->audible_frame ();

	if (!selection->tracks.empty()) {

		/* don't waste time searching for transients in duplicate playlists.
		 */

		TrackViewList ts = selection->tracks.filter_to_unique_playlists ();

		for (TrackViewList::iterator t = ts.begin(); t != ts.end(); ++t) {

			RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*> (*t);

			if (rtv) {
				boost::shared_ptr<Track> tr = rtv->track();
				if (tr) {
					boost::shared_ptr<Playlist> pl = tr->playlist ();
					if (pl) {
						framepos_t result = pl->find_next_transient (pos, forward ? 1 : -1);

						if (result >= 0) {
							positions.push_back (result);
						}
					}
				}
			}
		}

	} else {

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

		for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ++r) {
			(*r)->region()->get_transients (positions);
		}
	}

	TransientDetector::cleanup_transients (positions, _session->frame_rate(), 3.0);

	if (forward) {
		AnalysisFeatureList::iterator x;

		for (x = positions.begin(); x != positions.end(); ++x) {
			if ((*x) > pos) {
				break;
			}
		}

		if (x != positions.end ()) {
			_session->request_locate (*x);
		}

	} else {
		AnalysisFeatureList::reverse_iterator x;

		for (x = positions.rbegin(); x != positions.rend(); ++x) {
			if ((*x) < pos) {
				break;
			}
		}

		if (x != positions.rend ()) {
			_session->request_locate (*x);
		}
	}
}

void
Editor::playhead_forward_to_grid ()
{
	if (!_session) return;
	framepos_t pos = playhead_cursor->current_frame;
	if (pos < max_framepos - 1) {
		pos += 2;
		snap_to_internal (pos, 1, false);
		_session->request_locate (pos);
	}
}


void
Editor::playhead_backward_to_grid ()
{
	if (!_session) return;
	framepos_t pos = playhead_cursor->current_frame;
	if (pos > 2) {
		pos -= 2;
		snap_to_internal (pos, -1, false);
		_session->request_locate (pos);
	}
}

void
Editor::set_track_height (Height h)
{
	TrackSelection& ts (selection->tracks);

	for (TrackSelection::iterator x = ts.begin(); x != ts.end(); ++x) {
		(*x)->set_height_enum (h);
	}
}

void
Editor::toggle_tracks_active ()
{
	TrackSelection& ts (selection->tracks);
	bool first = true;
	bool target = false;

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

	for (TrackSelection::iterator x = ts.begin(); x != ts.end(); ++x) {
		RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*>(*x);

		if (rtv) {
			if (first) {
				target = !rtv->_route->active();
				first = false;
			}
			rtv->_route->set_active (target, this);
		}
	}
}

void
Editor::remove_tracks ()
{
	TrackSelection& ts (selection->tracks);

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

	vector<string> choices;
	string prompt;
	int ntracks = 0;
	int nbusses = 0;
	const char* trackstr;
	const char* busstr;
	vector<boost::shared_ptr<Route> > routes;
	bool special_bus = false;

	for (TrackSelection::iterator x = ts.begin(); x != ts.end(); ++x) {
		RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*> (*x);
		if (rtv) {
			if (rtv->is_track()) {
				ntracks++;
			} else {
				nbusses++;
			}
		}
		routes.push_back (rtv->_route);

		if (rtv->route()->is_master() || rtv->route()->is_monitor()) {
			special_bus = true;
		}
	}

	if (special_bus && !Config->get_allow_special_bus_removal()) {
		MessageDialog msg (_("That would be bad news ...."),
		                   false,
		                   Gtk::MESSAGE_INFO,
		                   Gtk::BUTTONS_OK);
		msg.set_secondary_text (string_compose (_(
			                                        "Removing the master or monitor bus is such a bad idea\n\
that %1 is not going to allow it.\n\
\n\
If you really want to do this sort of thing\n\
edit your ardour.rc file to set the\n\
\"allow-special-bus-removal\" option to be \"yes\""), PROGRAM_NAME));

		msg.present ();
		msg.run ();
		return;
	}

	if (ntracks + nbusses == 0) {
		return;
	}

	if (ntracks > 1) {
		trackstr = _("tracks");
	} else {
		trackstr = _("track");
	}

	if (nbusses > 1) {
		busstr = _("busses");
	} else {
		busstr = _("bus");
	}

	if (ntracks) {
		if (nbusses) {
			prompt  = string_compose (_("Do you really want to remove %1 %2 and %3 %4?\n"
						    "(You may also lose the playlists associated with the %2)\n\n"
						    "This action cannot be undone, and the session file will be overwritten!"),
						  ntracks, trackstr, nbusses, busstr);
		} else {
			prompt  = string_compose (_("Do you really want to remove %1 %2?\n"
						    "(You may also lose the playlists associated with the %2)\n\n"
						    "This action cannot be undone, and the session file will be overwritten!"),
						  ntracks, trackstr);
		}
	} else if (nbusses) {
		prompt  = string_compose (_("Do you really want to remove %1 %2?\n\n"
		                            "This action cannot be undon, and the session file will be overwritten"),
					  nbusses, busstr);
	}

	choices.push_back (_("No, do nothing."));
	if (ntracks + nbusses > 1) {
		choices.push_back (_("Yes, remove them."));
	} else {
		choices.push_back (_("Yes, remove it."));
	}

	string title;
	if (ntracks) {
		title = string_compose (_("Remove %1"), trackstr);
	} else {
		title = string_compose (_("Remove %1"), busstr);
	}

	Choice prompter (title, prompt, choices);

	if (prompter.run () != 1) {
		return;
	}

	for (vector<boost::shared_ptr<Route> >::iterator x = routes.begin(); x != routes.end(); ++x) {
		_session->remove_route (*x);
	}
}

void
Editor::do_insert_time ()
{
	if (selection->tracks.empty()) {
		return;
	}

	InsertTimeDialog d (*this);
	int response = d.run ();

	if (response != RESPONSE_OK) {
		return;
	}

	if (d.distance() == 0) {
		return;
	}

	InsertTimeOption opt = d.intersected_region_action ();

	insert_time (
		get_preferred_edit_position(),
		d.distance(),
		opt,
		d.all_playlists(),
		d.move_glued(),
		d.move_markers(),
		d.move_glued_markers(),
		d.move_locked_markers(),
		d.move_tempos()
		);
}

void
Editor::insert_time (
	framepos_t pos, framecnt_t frames, InsertTimeOption opt,
	bool all_playlists, bool ignore_music_glue, bool markers_too, bool glued_markers_too, bool locked_markers_too, bool tempo_too
	)
{
	bool commit = false;

	if (Config->get_edit_mode() == Lock) {
		return;
	}

	begin_reversible_command (_("insert time"));

	TrackViewList ts = selection->tracks.filter_to_unique_playlists ();

	for (TrackViewList::iterator x = ts.begin(); x != ts.end(); ++x) {

		/* regions */

		/* don't operate on any playlist more than once, which could
		 * happen if "all playlists" is enabled, but there is more
		 * than 1 track using playlists "from" a given track.
		 */

		set<boost::shared_ptr<Playlist> > pl;

		if (all_playlists) {
			RouteTimeAxisView* rtav = dynamic_cast<RouteTimeAxisView*> (*x);
			if (rtav) {
				vector<boost::shared_ptr<Playlist> > all = _session->playlists->playlists_for_track (rtav->track ());
				for (vector<boost::shared_ptr<Playlist> >::iterator p = all.begin(); p != all.end(); ++p) {
					pl.insert (*p);
				}
			}
		} else {
			if ((*x)->playlist ()) {
				pl.insert ((*x)->playlist ());
			}
		}
		
		for (set<boost::shared_ptr<Playlist> >::iterator i = pl.begin(); i != pl.end(); ++i) {

			(*i)->clear_changes ();
			(*i)->clear_owned_changes ();

			if (opt == SplitIntersected) {
				(*i)->split (pos);
			}

			(*i)->shift (pos, frames, (opt == MoveIntersected), ignore_music_glue);

			vector<Command*> cmds;
			(*i)->rdiff (cmds);
			_session->add_commands (cmds);

			_session->add_command (new StatefulDiffCommand (*i));
			commit = true;
		}

		/* automation */
		RouteTimeAxisView* rtav = dynamic_cast<RouteTimeAxisView*> (*x);
		if (rtav) {
			rtav->route ()->shift (pos, frames);
			commit = true;
		}
	}

	/* markers */
	if (markers_too) {
		bool moved = false;
		XMLNode& before (_session->locations()->get_state());
		Locations::LocationList copy (_session->locations()->list());

		for (Locations::LocationList::iterator i = copy.begin(); i != copy.end(); ++i) {

			Locations::LocationList::const_iterator tmp;

			bool const was_locked = (*i)->locked ();
			if (locked_markers_too) {
				(*i)->unlock ();
			}

			if ((*i)->position_lock_style() == AudioTime || glued_markers_too) {

				if ((*i)->start() >= pos) {
					(*i)->set_start ((*i)->start() + frames);
					if (!(*i)->is_mark()) {
						(*i)->set_end ((*i)->end() + frames);
					}
					moved = true;
				}

			}

			if (was_locked) {
				(*i)->lock ();
			}
		}

		if (moved) {
			XMLNode& after (_session->locations()->get_state());
			_session->add_command (new MementoCommand<Locations>(*_session->locations(), &before, &after));
		}
	}

	if (tempo_too) {
		_session->tempo_map().insert_time (pos, frames);
	}

	if (commit) {
		commit_reversible_command ();
	}
}

void
Editor::fit_selected_tracks ()
{
        if (!selection->tracks.empty()) {
                fit_tracks (selection->tracks);
        } else {
                TrackViewList tvl;

                /* no selected tracks - use tracks with selected regions */

                if (!selection->regions.empty()) {
                        for (RegionSelection::iterator r = selection->regions.begin(); r != selection->regions.end(); ++r) {
                                tvl.push_back (&(*r)->get_time_axis_view ());
                        }

                        if (!tvl.empty()) {
                                fit_tracks (tvl);
                        }
                } else if (internal_editing()) {
                        /* no selected tracks, or regions, but in internal edit mode, so follow the mouse and use
                           the entered track
                        */
                        if (entered_track) {
                                tvl.push_back (entered_track);
                                fit_tracks (tvl);
                        }
                }
        }
}

void
Editor::fit_tracks (TrackViewList & tracks)
{
	if (tracks.empty()) {
		return;
	}

	uint32_t child_heights = 0;
	int visible_tracks = 0;

	for (TrackSelection::iterator t = tracks.begin(); t != tracks.end(); ++t) {

		if (!(*t)->marked_for_display()) {
			continue;
		}

		child_heights += (*t)->effective_height() - (*t)->current_height();
		++visible_tracks;
	}

	uint32_t h = (uint32_t) floor ((_canvas_height - child_heights - canvas_timebars_vsize) / visible_tracks);
	double first_y_pos = DBL_MAX;

	if (h < TimeAxisView::preset_height (HeightSmall)) {
		MessageDialog msg (*this, _("There are too many tracks to fit in the current window"));
		/* too small to be displayed */
		return;
	}

	undo_visual_stack.push_back (current_visual_state (true));
	no_save_visual = true;

	/* build a list of all tracks, including children */

	TrackViewList all;
	for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
		all.push_back (*i);
		TimeAxisView::Children c = (*i)->get_child_list ();
		for (TimeAxisView::Children::iterator j = c.begin(); j != c.end(); ++j) {
			all.push_back (j->get());
		}
	}

	/* operate on all tracks, hide unselected ones that are in the middle of selected ones */

	bool prev_was_selected = false;
	bool is_selected = tracks.contains (all.front());
	bool next_is_selected;

	for (TrackViewList::iterator t = all.begin(); t != all.end(); ++t) {

		TrackViewList::iterator next;

		next = t;
		++next;

		if (next != all.end()) {
			next_is_selected = tracks.contains (*next);
		} else {
			next_is_selected = false;
		}

		if ((*t)->marked_for_display ()) {
			if (is_selected) {
				(*t)->set_height (h);
				first_y_pos = std::min ((*t)->y_position (), first_y_pos);
			} else {
				if (prev_was_selected && next_is_selected) {
					hide_track_in_display (*t);
				}
			}
		}

		prev_was_selected = is_selected;
		is_selected = next_is_selected;
	}

	/*
	   set the controls_layout height now, because waiting for its size
	   request signal handler will cause the vertical adjustment setting to fail
	*/

	controls_layout.property_height () = full_canvas_height - canvas_timebars_vsize;
	vertical_adjustment.set_value (first_y_pos);

	redo_visual_stack.push_back (current_visual_state (true));
}

void
Editor::save_visual_state (uint32_t n)
{
	while (visual_states.size() <= n) {
		visual_states.push_back (0);
	}

	if (visual_states[n] != 0) {
		delete visual_states[n];
	}

	visual_states[n] = current_visual_state (true);
	gdk_beep ();
}

void
Editor::goto_visual_state (uint32_t n)
{
	if (visual_states.size() <= n) {
		return;
	}

	if (visual_states[n] == 0) {
		return;
	}

	use_visual_state (*visual_states[n]);
}

void
Editor::start_visual_state_op (uint32_t n)
{
	save_visual_state (n);
	
	PopUp* pup = new PopUp (WIN_POS_MOUSE, 1000, true);
	char buf[32];
	snprintf (buf, sizeof (buf), _("Saved view %u"), n+1);
	pup->set_text (buf);
	pup->touch();
}

void
Editor::cancel_visual_state_op (uint32_t n)
{
        goto_visual_state (n);
}

void
Editor::toggle_region_mute ()
{
	if (_ignore_region_action) {
		return;
	}

	RegionSelection rs = get_regions_from_selection_and_entered ();

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

	if (rs.size() > 1) {
		begin_reversible_command (_("mute regions"));
	} else {
		begin_reversible_command (_("mute region"));
	}

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {

		(*i)->region()->playlist()->clear_changes ();
		(*i)->region()->set_muted (!(*i)->region()->muted ());
		_session->add_command (new StatefulDiffCommand ((*i)->region()->playlist()));

	}

	commit_reversible_command ();
}

void
Editor::combine_regions ()
{
	/* foreach track with selected regions, take all selected regions
	   and join them into a new region containing the subregions (as a
	   playlist)
	*/

	typedef set<RouteTimeAxisView*> RTVS;
	RTVS tracks;

	if (selection->regions.empty()) {
		return;
	}

	for (RegionSelection::iterator i = selection->regions.begin(); i != selection->regions.end(); ++i) {
		RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*>(&(*i)->get_time_axis_view());

		if (rtv) {
			tracks.insert (rtv);
		}
	}

	begin_reversible_command (_("combine regions"));

	vector<RegionView*> new_selection;

	for (RTVS::iterator i = tracks.begin(); i != tracks.end(); ++i) {
		RegionView* rv;

		if ((rv = (*i)->combine_regions ()) != 0) {
			new_selection.push_back (rv);
		}
	}

	selection->clear_regions ();
	for (vector<RegionView*>::iterator i = new_selection.begin(); i != new_selection.end(); ++i) {
		selection->add (*i);
	}

	commit_reversible_command ();
}

void
Editor::uncombine_regions ()
{
	typedef set<RouteTimeAxisView*> RTVS;
	RTVS tracks;

	if (selection->regions.empty()) {
		return;
	}

	for (RegionSelection::iterator i = selection->regions.begin(); i != selection->regions.end(); ++i) {
		RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*>(&(*i)->get_time_axis_view());

		if (rtv) {
			tracks.insert (rtv);
		}
	}

	begin_reversible_command (_("uncombine regions"));

	for (RTVS::iterator i = tracks.begin(); i != tracks.end(); ++i) {
		(*i)->uncombine_regions ();
	}

	commit_reversible_command ();
}

void
Editor::toggle_midi_input_active (bool flip_others)
{
	bool onoff = false;
	boost::shared_ptr<RouteList> rl (new RouteList);

	for (TrackSelection::iterator i = selection->tracks.begin(); i != selection->tracks.end(); ++i) {
		RouteTimeAxisView *rtav = dynamic_cast<RouteTimeAxisView *>(*i);

		if (!rtav) {
			continue;
		}

		boost::shared_ptr<MidiTrack> mt = rtav->midi_track();

		if (mt) {
			rl->push_back (rtav->route());
			onoff = !mt->input_active();
		}
	}
	
	_session->set_exclusive_input_active (rl, onoff, flip_others);
}