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 <pbd/error.h>
#include <pbd/basename.h>
#include <pbd/pthread_utils.h>
#include <pbd/memento_command.h>
#include <pbd/whitespace.h>

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

#include <ardour/audioengine.h>
#include <ardour/session.h>
#include <ardour/audioplaylist.h>
#include <ardour/audioregion.h>
#include <ardour/audio_diskstream.h>
#include <ardour/utils.h>
#include <ardour/location.h>
#include <ardour/named_selection.h>
#include <ardour/audio_track.h>
#include <ardour/audiofilesource.h>
#include <ardour/audioplaylist.h>
#include <ardour/region_factory.h>
#include <ardour/playlist_factory.h>
#include <ardour/reverse.h>
#include <ardour/transient_detector.h>
#include <ardour/dB.h>
#include <ardour/quantize.h>

#include "ardour_ui.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 "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 "i18n.h"

using namespace std;
using namespace ARDOUR;
using namespace PBD;
using namespace sigc;
using namespace Gtk;
using namespace Gtkmm2ext;
using namespace Editing;

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

void
Editor::undo (uint32_t n)
{
	if (session) {
		session->undo (n);
	}
}

void
Editor::redo (uint32_t n)
{
	if (session) {
		session->redo (n);
	}
}

void
Editor::split_region ()
{
	split_region_at (get_preferred_edit_position());
}

void
Editor::split_region_at (nframes_t where)
{
	RegionSelection rs;

	get_regions_for_action (rs);
	split_regions_at (where, selection->regions);
}

void
Editor::split_regions_at (nframes_t where, RegionSelection& regions)
{
	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);
	}

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

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

		AudioRegionView* const arv = dynamic_cast<AudioRegionView*>(*a);

		if (arv) {
			_new_regionviews_show_envelope = arv->envelope_visible();
		}
		
		if (pl) {
                        XMLNode &before = pl->get_state();
			pl->split_region ((*a)->region(), where);
                        XMLNode &after = pl->get_state();
                        session->add_command(new MementoCommand<Playlist>(*pl, &before, &after));
		}

		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 ();
	_new_regionviews_show_envelope = false;
}


/** 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"));
        XMLNode &before = playlist->get_state();
	playlist->remove_region (clicked_regionview->region());
        XMLNode &after = playlist->get_state();
	session->add_command(new MementoCommand<Playlist>(*playlist, &before, &after));
	commit_reversible_command ();
}


/** Remove the selected regions */
void
Editor::remove_selected_regions ()
{
	if (selection->regions.empty()) {
		return;
	}

	/* XXX: should be called remove regions if we're removing more than one */
	begin_reversible_command (_("remove region"));
	

	while (!selection->regions.empty()) {
		boost::shared_ptr<Region> region = selection->regions.front()->region ();
		boost::shared_ptr<Playlist> playlist = region->playlist ();

		XMLNode &before = playlist->get_state();
		playlist->remove_region (region);
		XMLNode &after = playlist->get_state();
		session->add_command(new MementoCommand<Playlist>(*playlist, &before, &after));
	}

	commit_reversible_command ();
}

boost::shared_ptr<Region>
Editor::select_region_for_operation (int dir, TimeAxisView **tv)
{
	RegionView* rv;
	boost::shared_ptr<Region> region;
	nframes_t start = 0;

	if (selection->time.start () == selection->time.end_frame ()) {
		
		/* no current selection-> is there a selected regionview? */

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

	} 

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

		rv = *(selection->regions.begin());
		(*tv) = &rv->get_time_axis_view();
		region = rv->region();

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

		(*tv) = selection->tracks.front();

		RouteTimeAxisView* rtv;

		if ((rtv = dynamic_cast<RouteTimeAxisView*> (*tv)) != 0) {
			boost::shared_ptr<Playlist> pl;
			
			if ((pl = rtv->playlist()) == 0) {
				return region;
			}
			
			region = pl->top_region_at (start);
		}
	} 
	
	return region;
}
	
void
Editor::extend_selection_to_end_of_region (bool next)
{
	TimeAxisView *tv;
	boost::shared_ptr<Region> region;
	nframes_t start;

	if ((region = select_region_for_operation (next ? 1 : 0, &tv)) == 0) {
		return;
	}

	if (region && selection->time.start () == selection->time.end_frame ()) {
		start = region->position();
	} else {
		start = selection->time.start ();
	}

	/* Try to leave the selection with the same route if possible */

	if ((tv = selection->time.track) == 0) {
		return;
	}

	begin_reversible_command (_("extend selection"));
	selection->set (tv, start, region->position() + region->length());
	commit_reversible_command ();
}

void
Editor::extend_selection_to_start_of_region (bool previous)
{
	TimeAxisView *tv;
	boost::shared_ptr<Region> region;
	nframes_t end;

	if ((region = select_region_for_operation (previous ? -1 : 0, &tv)) == 0) {
		return;
	}

	if (region && selection->time.start () == selection->time.end_frame ()) {
		end = region->position() + region->length();
	} else {
		end = selection->time.end_frame ();
	}

	/* Try to leave the selection with the same route if possible */
	
	if ((tv = selection->time.track) == 0) {
		return;
	}

	begin_reversible_command (_("extend selection"));
	selection->set (tv, region->position(), 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)
{
	nframes_t distance;
	nframes_t next_distance;
	RegionSelection rs; 

	get_regions_for_action (rs);

	if (!session) return;
	
	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;
			}

                        XMLNode &before = r->playlist()->get_state();
			r->set_position (r->position() + distance, this);
                        XMLNode &after = r->playlist()->get_state();
			session->add_command (new MementoCommand<Playlist>(*(r->playlist()), &before, &after));
		}

		commit_reversible_command ();

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

		bool is_start;
		Location* loc = find_location_from_marker (selection->markers.front(), is_start);

		if (loc) {

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

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

			if (is_start) {
				distance = get_nudge_distance (loc->start(), next_distance);
				if (next) {
					distance = next_distance;
				}
				if (max_frames - distance > loc->start() + loc->length()) {
					loc->set_start (loc->start() + distance);
				} else {
					loc->set_start (max_frames - loc->length());
				}
			} else {
				distance = get_nudge_distance (loc->end(), next_distance);
				if (next) {
					distance = next_distance;
				}
				if (max_frames - distance > loc->end()) {
					loc->set_end (loc->end() + distance);
				} else {
					loc->set_end (max_frames);
				}
			}
			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)
{
	nframes_t distance;
	nframes_t next_distance;
	RegionSelection rs; 

	get_regions_for_action (rs);

	if (!session) return;
	
	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;
			}

                        XMLNode &before = r->playlist()->get_state();
			
			if (r->position() > distance) {
				r->set_position (r->position() - distance, this);
			} else {
				r->set_position (0, this);
			}
                        XMLNode &after = r->playlist()->get_state();
			session->add_command(new MementoCommand<Playlist>(*(r->playlist()), &before, &after));
		}

		commit_reversible_command ();

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

		bool is_start;
		Location* loc = find_location_from_marker (selection->markers.front(), is_start);

		if (loc) {

			begin_reversible_command (_("nudge location forward"));
			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));
		}
		
	} 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 ()
{
	nframes_t distance;
	RegionSelection rs; 

	get_regions_for_action (rs);

	if (!session) return;
	
	if (!rs.empty()) {

		begin_reversible_command (_("nudge forward"));

		distance = session->worst_output_latency();

		for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
			boost::shared_ptr<Region> r ((*i)->region());
			
			XMLNode &before = r->playlist()->get_state();
			r->set_position (r->position() + distance, this);
			XMLNode &after = r->playlist()->get_state();
			session->add_command(new MementoCommand<Playlist>(*(r->playlist()), &before, &after));
		}

		commit_reversible_command ();

	} 
}
		
void
Editor::nudge_backward_capture_offset ()
{
	nframes_t distance;
	RegionSelection rs; 

	get_regions_for_action (rs);

	if (!session) return;
	
	if (!rs.empty()) {

		begin_reversible_command (_("nudge forward"));

		distance = session->worst_output_latency();

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

                        XMLNode &before = r->playlist()->get_state();
			
			if (r->position() > distance) {
				r->set_position (r->position() - distance, this);
			} else {
				r->set_position (0, this);
			}
                        XMLNode &after = r->playlist()->get_state();
			session->add_command(new MementoCommand<Playlist>(*(r->playlist()), &before, &after));
		}

		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 ()
{
	nframes_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;
	} else {
		tlist = track_views;
	}

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

		nframes_t rpos;
		nframes_t lpos = max_frames;

		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->adjust_to_sync (r->first_frame());
				break;

			default:
				break;
			}
			
			float speed = 1.0f;
			RouteTimeAxisView *rtav;
			
			if (ontrack != 0 && (rtav = dynamic_cast<RouteTimeAxisView*>(ontrack)) != 0 ) {
				if (rtav->get_diskstream() != 0) {
					speed = rtav->get_diskstream()->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<nframes_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 (nframes_t frame, RegionPoint point, int32_t dir, TrackViewList& tracks, TimeAxisView **ontrack)
{
	TrackViewList::iterator i;
	nframes_t closest = max_frames;
	boost::shared_ptr<Region> ret;
	nframes_t rpos = 0;

	float track_speed;
	nframes_t track_frame;
	RouteTimeAxisView *rtav;

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

		nframes_t distance;
		boost::shared_ptr<Region> r;
		
		track_speed = 1.0f;
		if ( (rtav = dynamic_cast<RouteTimeAxisView*>(*i)) != 0 ) {
			if (rtav->get_diskstream()!=0)
				track_speed = rtav->get_diskstream()->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->adjust_to_sync (r->first_frame());
			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;
}

nframes64_t
Editor::find_next_region_boundary (nframes64_t pos, int32_t dir, const TrackViewList& tracks)
{
	nframes64_t distance = max_frames;
	nframes64_t current_nearest = -1;

	for (TrackViewList::const_iterator i = tracks.begin(); i != tracks.end(); ++i) {
		nframes64_t contender;
		nframes64_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;
}

void
Editor::cursor_to_region_boundary (Cursor* cursor, int32_t dir)
{
	nframes64_t pos = cursor->current_frame;
	nframes64_t target;

	if (!session) {
		return;
	}

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

	if (!selection->tracks.empty()) {
		
		target = find_next_region_boundary (pos, dir, selection->tracks);
		
	} else {
		
		target = find_next_region_boundary (pos, dir, track_views);
	}
	
	if (target < 0) {
		return;
	}


	if (cursor == playhead_cursor) {
		session->request_locate (target);
	} else {
		cursor->set_position (target);
	}
}

void
Editor::cursor_to_next_region_boundary (Cursor* cursor)
{
	cursor_to_region_boundary (cursor, 1);
}

void
Editor::cursor_to_previous_region_boundary (Cursor* cursor)
{
	cursor_to_region_boundary (cursor, -1);
}

void
Editor::cursor_to_region_point (Cursor* cursor, RegionPoint point, int32_t dir)
{
	boost::shared_ptr<Region> r;
	nframes_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->adjust_to_sync (r->first_frame());
		break;	
	}
	
	float speed = 1.0f;
	RouteTimeAxisView *rtav;

	if ( ontrack != 0 && (rtav = dynamic_cast<RouteTimeAxisView*>(ontrack)) != 0 ) {
		if (rtav->get_diskstream() != 0) {
			speed = rtav->get_diskstream()->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 (Cursor* cursor, RegionPoint point)
{
	cursor_to_region_point (cursor, point, 1);
}

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

void
Editor::cursor_to_selection_start (Cursor *cursor)
{
	nframes_t pos = 0;
	RegionSelection rs; 

	get_regions_for_action (rs);

	switch (mouse_mode) {
	case MouseObject:
		if (!rs.empty()) {
			pos = rs.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 (Cursor *cursor)
{
	nframes_t pos = 0;
	RegionSelection rs; 

	get_regions_for_action (rs);

	switch (mouse_mode) {
	case MouseObject:
		if (!rs.empty()) {
			pos = rs.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 (int32_t dir)
{
	nframes64_t target;
	Location* loc;
	bool ignored;

	if (!session) {
		return;
	}

	if (selection->markers.empty()) {
		nframes64_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;
	}

	nframes64_t pos = loc->start();

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

	if (!selection->tracks.empty()) {
		
		target = find_next_region_boundary (pos, dir, selection->tracks);
		
	} else {
		
		target = find_next_region_boundary (pos, dir, track_views);
	}
	
	if (target < 0) {
		return;
	}

	loc->move_to (target);
}

void
Editor::selected_marker_to_next_region_boundary ()
{
	selected_marker_to_region_boundary (1);
}

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

void
Editor::selected_marker_to_region_point (RegionPoint point, int32_t dir)
{
	boost::shared_ptr<Region> r;
	nframes_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;
	AudioTimeAxisView *atav;

	if ( ontrack != 0 && (atav = dynamic_cast<AudioTimeAxisView*>(ontrack)) != 0 ) {
		if (atav->get_diskstream() != 0) {
			speed = atav->get_diskstream()->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 ()
{
	nframes_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;
	}

	RegionSelection rs; 

	get_regions_for_action (rs);

	switch (mouse_mode) {
	case MouseObject:
		if (!rs.empty()) {
			pos = rs.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 ()
{
	nframes_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;
	}

	RegionSelection rs; 

	get_regions_for_action (rs);

	switch (mouse_mode) {
	case MouseObject:
		if (!rs.empty()) {
			pos = rs.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)
{
	nframes_t pos = playhead_cursor->current_frame;
	nframes_t delta = (nframes_t) floor (current_page_frames() / 0.8);

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

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

	} else {

		if (pos == 0) {
			return;
		} 

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

	session->request_locate (pos);
}

void
Editor::playhead_backward ()
{
	nframes_t pos;
	nframes_t cnt;
	float prefix;
	bool was_floating;

	if (get_prefix (prefix, was_floating)) {
		cnt = 1;
	} else {
		if (was_floating) {
			cnt = (nframes_t) floor (prefix * session->frame_rate ());
		} else {
			cnt = (nframes_t) prefix;
		}
	}

	pos = playhead_cursor->current_frame;

	if ((nframes_t) pos < cnt) {
		pos = 0;
	} else {
		pos -= cnt;
	}
	
	/* XXX this is completely insane. with the current buffering
	   design, we'll force a complete track buffer flush and
	   reload, just to move 1 sample !!!
	*/

	session->request_locate (pos);
}

void
Editor::playhead_forward ()
{
	nframes_t pos;
	nframes_t cnt;
	bool was_floating;
	float prefix;

	if (get_prefix (prefix, was_floating)) {
		cnt = 1;
	} else {
		if (was_floating) {
			cnt = (nframes_t) floor (prefix * session->frame_rate ());
		} else {
			cnt = (nframes_t) floor (prefix);
		}
	}

	pos = playhead_cursor->current_frame;
	
	/* XXX this is completely insane. with the current buffering
	   design, we'll force a complete track buffer flush and
	   reload, just to move 1 sample !!!
	*/

	session->request_locate (pos+cnt);
}

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::edit_cursor_backward ()
{
	nframes64_t pos;
	nframes64_t cnt;
	float prefix;
	bool was_floating;

	if (get_prefix (prefix, was_floating)) {
		cnt = 1;
	} else {
		if (was_floating) {
			cnt = (nframes_t) floor (prefix * session->frame_rate ());
		} else {
			cnt = (nframes_t) prefix;
		}
	}

	if ((pos = get_preferred_edit_position()) < 0) {
		return;
	}

	if (pos < cnt) {
		pos = 0;
	} else {
		pos -= cnt;
	}
	
	// EDIT CURSOR edit_cursor->set_position (pos);
}

void
Editor::edit_cursor_forward ()
{
	//nframes_t pos;
	nframes_t cnt;
	bool was_floating;
	float prefix;

	if (get_prefix (prefix, was_floating)) {
		cnt = 1;
	} else {
		if (was_floating) {
			cnt = (nframes_t) floor (prefix * session->frame_rate ());
		} else {
			cnt = (nframes_t) floor (prefix);
		}
	}

	// pos = edit_cursor->current_frame;
	// EDIT CURSOR edit_cursor->set_position (pos+cnt);
}

void
Editor::goto_frame ()
{
	float prefix;
	bool was_floating;
	nframes_t frame;

	if (get_prefix (prefix, was_floating)) {
		return;
	}

	if (was_floating) {
		frame = (nframes_t) floor (prefix * session->frame_rate());
	} else {
		frame = (nframes_t) floor (prefix);
	}

	session->request_locate (frame);
}

void
Editor::scroll_backward (float pages)
{
	nframes_t frame;
	nframes_t one_page = (nframes_t) rint (canvas_width * frames_per_unit);
	bool was_floating;
	float prefix;
	nframes_t cnt;
	
	if (get_prefix (prefix, was_floating)) {
		cnt = (nframes_t) floor (pages * one_page);
	} else {
		if (was_floating) {
			cnt = (nframes_t) floor (prefix * session->frame_rate());
		} else {
			cnt = (nframes_t) floor (prefix * one_page);
		}
	}

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

	reset_x_origin (frame);
}

void
Editor::scroll_forward (float pages)
{
	nframes_t frame;
	nframes_t one_page = (nframes_t) rint (canvas_width * frames_per_unit);
	bool was_floating;
	float prefix;
	nframes_t cnt;
	
	if (get_prefix (prefix, was_floating)) {
		cnt = (nframes_t) floor (pages * one_page);
	} else {
		if (was_floating) {
			cnt = (nframes_t) floor (prefix * session->frame_rate());
		} else {
			cnt = (nframes_t) floor (prefix * one_page);
		}
	}

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

	reset_x_origin (frame);
}

void
Editor::scroll_tracks_down ()
{
	float prefix;
	bool was_floating;
	int cnt;

	if (get_prefix (prefix, was_floating)) {
		cnt = 1;
	} else {
		cnt = (int) floor (prefix);
	}

	double vert_value = vertical_adjustment.get_value() + (cnt *
		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 ()
{
	float prefix;
	bool was_floating;
	int cnt;

	if (get_prefix (prefix, was_floating)) {
		cnt = 1;
	} else {
		cnt = (int) floor (prefix);
	}

	vertical_adjustment.set_value (vertical_adjustment.get_value() - (cnt * vertical_adjustment.get_page_size()));
}

void
Editor::scroll_tracks_down_line ()
{

        Gtk::Adjustment* adj = edit_vscrollbar.get_adjustment();
	double vert_value = adj->get_value() + 20;

	if (vert_value>adj->get_upper() - canvas_height) {
		vert_value = adj->get_upper() - canvas_height;
	}
	adj->set_value (vert_value);
}

void
Editor::scroll_tracks_up_line ()
{
        Gtk::Adjustment* adj = edit_vscrollbar.get_adjustment();
	adj->set_value (adj->get_value() - 20);
}

/* ZOOM */

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

	double nfpu;

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

	temporal_zoom (nfpu);
}	

void
Editor::temporal_zoom (gdouble fpu)
{
	if (!session) return;
	
	nframes64_t current_page = current_page_frames();
	nframes64_t current_leftmost = leftmost_frame;
	nframes64_t current_rightmost;
	nframes64_t current_center;
	nframes64_t new_page_size;
	nframes64_t half_page_size;
	nframes64_t leftmost_after_zoom = 0;
	nframes64_t where;
	bool in_track_canvas;
	double nfpu;
	double l;

	/* XXX this limit is also in ::set_frames_per_unit() */

	if (frames_per_unit <= 2.0 && fpu <= frames_per_unit) {
		return;
	}

	nfpu = fpu;
	
	new_page_size = (nframes_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:
		/* try to keep the playhead in the same place */

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

		if (l < 0) {
			leftmost_after_zoom = 0;
		} else if (l > max_frames) { 
			leftmost_after_zoom = max_frames - new_page_size;
		} else {
			leftmost_after_zoom = (nframes64_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_frames) { 
				leftmost_after_zoom = max_frames - new_page_size;
			} else {
				leftmost_after_zoom = (nframes64_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_frames) { 
				leftmost_after_zoom = max_frames - new_page_size;
			} else {
				leftmost_after_zoom = (nframes64_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 ()
{

	nframes64_t start = max_frames;
	nframes64_t end = 0;
	RegionSelection rs; 

	get_regions_for_action (rs);

	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;
		}
	}

	/* 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;
	nframes_t extra_samples = unit_to_frame (one_centimeter_in_pixels);
	
	if (start > extra_samples) {
		start -= extra_samples;
	} else {
		start = 0;
	} 

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

	temporal_zoom_by_frame (start, end, "zoom to region");
	zoomed_to_region = true;
}

void
Editor::toggle_zoom_region ()
{
	if (zoomed_to_region) {
		swap_visual_state ();
	} else {
		temporal_zoom_region ();
	}
}

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

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

	temporal_zoom_by_frame (start, end, "zoom to selection");
}

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

	if (session) {
		temporal_zoom_by_frame (session->current_start_frame(), session->current_end_frame(), "zoom to session");
	}
}

void
Editor::temporal_zoom_by_frame (nframes_t start, nframes_t end, const string & op)
{
	if (!session) return;

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

	nframes_t range = end - start;

	double new_fpu = (double)range / (double)canvas_width;
// 	double p2 = 1.0;

// 	while (p2 < new_fpu) {
// 		p2 *= 2.0;
// 	}
// 	new_fpu = p2;
	
	nframes_t new_page = (nframes_t) floor (canvas_width * new_fpu);
	nframes_t middle = (nframes_t) floor( (double)start + ((double)range / 2.0f ));
	nframes_t new_leftmost = (nframes_t) floor( (double)middle - ((double)new_page/2.0f));

	if (new_leftmost > middle) new_leftmost = 0;

//	begin_reversible_command (op);
//	session->add_undo (bind (mem_fun(*this, &Editor::reposition_and_zoom), leftmost_frame, frames_per_unit));
//	session->add_redo (bind (mem_fun(*this, &Editor::reposition_and_zoom), new_leftmost, new_fpu));
//	commit_reversible_command ();

	reposition_and_zoom (new_leftmost, new_fpu);
}

void 
Editor::temporal_zoom_to_frame (bool coarser, nframes_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;

	nframes_t new_leftmost = frame - (nframes_t)range_before;

	if (new_leftmost > frame) new_leftmost = 0;

//	begin_reversible_command (_("zoom to frame"));
//	session->add_undo (bind (mem_fun(*this, &Editor::reposition_and_zoom), leftmost_frame, frames_per_unit));
//	session->add_redo (bind (mem_fun(*this, &Editor::reposition_and_zoom), new_leftmost, new_fpu));
//	commit_reversible_command ();

	reposition_and_zoom (new_leftmost, new_fpu);
}

void
Editor::add_location_from_selection ()
{
	string rangename;

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

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

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

	session->locations()->next_available_name(rangename,"selection");
	Location *location = new Location (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 (nframes64_t where)
{
	string markername;

	select_new_marker = true;

	session->locations()->next_available_name(markername,"mark");
	Location *location = new Location (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());
}

void
Editor::add_location_from_audio_region ()
{
	RegionSelection rs; 

	get_regions_for_action (rs);

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

	RegionView* rv = *(rs.begin());
	boost::shared_ptr<Region> region = rv->region();
	
	Location *location = new Location (region->position(), region->last_frame(), region->name(), 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::amplitude_zoom_step (bool in)
{
	gdouble zoom = 1.0;

	if (in) {
		zoom *= 2.0;
	} else {
		if (zoom > 2.0) {
			zoom /= 2.0;
		} else {
			zoom = 1.0;
		}
	}

#ifdef FIX_FOR_CANVAS
	/* XXX DO SOMETHING */
#endif
}	


/* DELETION */


void
Editor::delete_sample_forward ()
{
}

void
Editor::delete_sample_backward ()
{
}

void
Editor::delete_screen ()
{
}

/* SEARCH */

void
Editor::search_backwards ()
{
	/* what ? */
}

void
Editor::search_forwards ()
{
	/* what ? */
}

/* MARKS */

void
Editor::jump_forward_to_mark ()
{
	if (!session) {
		return;
	}
	
	Location *location = session->locations()->first_location_after (playhead_cursor->current_frame);

	if (location) {
		session->request_locate (location->start(), session->transport_rolling());
	} else {
		session->request_locate (session->current_end_frame());
	}
}

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

	Location *location = session->locations()->first_location_before (playhead_cursor->current_frame);
	
	if (location) {
		session->request_locate (location->start(), session->transport_rolling());
	} else {
		session->goto_start ();
	}
}

void
Editor::set_mark ()
{
	nframes_t pos;
	float prefix;
	bool was_floating;
	string markername;

	if (get_prefix (prefix, was_floating)) {
		pos = session->audible_frame ();
	} else {
		if (was_floating) {
			pos = (nframes_t) floor (prefix * session->frame_rate ());
		} else {
			pos = (nframes_t) floor (prefix);
		}
	}

	session->locations()->next_available_name(markername,"mark");
	session->locations()->add (new Location (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();
		
		session->locations()->clear_ranges ();
		// re-add these
		if (looploc) session->locations()->add (looploc);
		if (punchloc) session->locations()->add (punchloc);
		
                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;
	TimeAxisView *tv;
	nframes_t where;
	RouteTimeAxisView *rtv = 0;
	boost::shared_ptr<Playlist> playlist;
	
	track_canvas->window_to_world (x, y, wx, wy);
	wx += horizontal_adjustment.get_value();
	wy += vertical_adjustment.get_value();

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

	if ((playlist = rtv->playlist()) == 0) {
		return;
	}
	
	snap_to (where);
	
	begin_reversible_command (_("insert dragged region"));
        XMLNode &before = playlist->get_state();
	playlist->add_region (RegionFactory::create (region), where, 1.0);
	session->add_command(new MementoCommand<Playlist>(*playlist, &before, &playlist->get_state()));
	commit_reversible_command ();
}

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

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

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

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

	if ((tv = trackview_by_y_position (cy)) == 0) {
		return;
	}

	if ((dest_rtv = dynamic_cast<RouteTimeAxisView*>(tv)) == 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;
	}
	
	Glib::RefPtr<TreeSelection> selected = region_list_display.get_selection();
	
	if (selected->count_selected_rows() != 1) {
		return;
	}
	
	TreeView::Selection::ListHandle_Path rows = selected->get_selected_rows ();

	/* only one row selected, so rows.begin() is it */

	TreeIter iter;

	if ((iter = region_list_model->get_iter (*rows.begin()))) {

		boost::shared_ptr<Region> region = (*iter)[region_list_columns.region];
		
		begin_reversible_command (_("insert region"));
		XMLNode &before = playlist->get_state();
		playlist->add_region ((RegionFactory::create (region)), get_preferred_edit_position(), times);
		session->add_command(new MementoCommand<Playlist>(*playlist, &before, &playlist->get_state()));
		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;
	}

	switch (Config->get_slave_source()) {
	case None:
	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::toggle_playback (bool with_abort)
{
	if (!session) {
		return;
	}

	switch (Config->get_slave_source()) {
	case None:
	case JACK:
		break;
	default:
		/* transport controlled by the master */
		return;
	}

	if (session->is_auditioning()) {
		session->cancel_audition ();
		return;
	}
	
	if (session->transport_rolling()) {
		session->request_stop (with_abort);
		if (session->get_play_loop()) {
			session->request_play_loop (false);
		}
	} else {
		session->request_transport_speed (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 ()
{
	nframes64_t start_frame;
	nframes64_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 (true);
}

void
Editor::loop_selected_region ()
{
	RegionSelection rs; 

	get_regions_for_action (rs);

	if (!rs.empty()) {
		RegionView *rv = *(rs.begin());
		Location* tll;

		if ((tll = transport_loop_location()) != 0)  {

			tll->set (rv->region()->position(), rv->region()->last_frame());
			
			// enable looping, reposition and start rolling

			session->request_play_loop (true);
			session->request_locate (tll->start(), false);
			session->request_transport_speed (1.0f);
		}
	}
}

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::raise_region ()
{
	selection->foreach_region (&Region::raise);
}

void
Editor::raise_region_to_top ()
{
	selection->foreach_region (&Region::raise_to_top);
}

void
Editor::lower_region ()
{
	selection->foreach_region (&Region::lower);
}

void
Editor::lower_region_to_bottom ()
{
	selection->foreach_region (&Region::lower_to_bottom);
}

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

void
Editor::rename_region()
{
	RegionSelection rs; 

	get_regions_for_action (rs);

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

	WindowTitle title (Glib::get_application_name());
	title += _("Rename Region");

	ArdourDialog d (*this, title.get_string(), 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::OK, Gtk::RESPONSE_OK);
	d.add_button(Gtk::Stock::CANCEL, Gtk::RESPONSE_CANCEL);

	d.set_size_request (300, -1);
	d.set_position (Gtk::WIN_POS_MOUSE);

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

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

	int ret = d.run();

	d.hide ();

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

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 ()
{
	nframes64_t start, end;

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

void
Editor::play_selected_region ()
{
	nframes64_t start = max_frames;
	nframes64_t end = 0;
	RegionSelection rs; 

	get_regions_for_action (rs);
	 
	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_stop ();
	session->request_bounded_roll (start, end);
}

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

void
Editor::build_interthread_progress_window ()
{
	interthread_progress_window = new ArdourDialog (X_("interthread progress"), true);

	interthread_progress_bar.set_orientation (Gtk::PROGRESS_LEFT_TO_RIGHT);
	
	interthread_progress_window->get_vbox()->pack_start (interthread_progress_label, false, false);
	interthread_progress_window->get_vbox()->pack_start (interthread_progress_bar,false, false);

	// GTK2FIX: this button needs a modifiable label

	Button* b = interthread_progress_window->add_button (Stock::CANCEL, RESPONSE_CANCEL);
	b->signal_clicked().connect (mem_fun(*this, &Editor::interthread_cancel_clicked));

	interthread_cancel_button.add (interthread_cancel_label);

	interthread_progress_window->set_default_size (200, 100);
}

void
Editor::interthread_cancel_clicked ()
{
	if (current_interthread_info) {
		current_interthread_info->cancel = true;
	}
}

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

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

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

	nframes_t selection_cnt = end - start + 1;
	
	for (TrackSelection::iterator i = selection->tracks.begin(); i != selection->tracks.end(); ++i) {
		boost::shared_ptr<AudioRegion> current;
		boost::shared_ptr<Region> current_r;
		boost::shared_ptr<Playlist> pl;

		nframes_t internal_start;
		string new_name;

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

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

		current = boost::dynamic_pointer_cast<AudioRegion> (current_r);
		assert(current); // FIXME
		if (current != 0) {
			internal_start = start - current->position();
			session->region_name (new_name, current->name(), true);
			boost::shared_ptr<Region> region (RegionFactory::create (current, internal_start, selection_cnt, new_name));
		}
	}
}	

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

	nframes_t start = selection->time[clicked_selection].start;
	nframes_t end = selection->time[clicked_selection].end;
	
	sort_track_selection ();

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

		boost::shared_ptr<AudioRegion> current;
		boost::shared_ptr<Region> current_r;
		boost::shared_ptr<Playlist> playlist;
		nframes_t internal_start;
		string new_name;

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

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

		if ((current = boost::dynamic_pointer_cast<AudioRegion>(current_r)) == 0) {
			continue;
		}
	
		internal_start = start - current->position();
		session->region_name (new_name, current->name(), true);
		
		new_regions.push_back (boost::dynamic_pointer_cast<AudioRegion> (RegionFactory::create (current, internal_start, end - start + 1, new_name)));
	}
}

void
Editor::split_multichannel_region ()
{
	RegionSelection rs; 

	get_regions_for_action (rs);

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

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

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

		AudioRegionView* arv = dynamic_cast<AudioRegionView*>(*x);
		
		if (!arv || arv->audio_region()->n_channels() < 2) {
			continue;
		}

		(arv)->audio_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 OverlapNone:
		break;
	default:
		rs->push_back (rv);
	}
}

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

	if (selection->tracks.empty()) {
		
		/* use tracks with selected regions */

		RegionSelection rs; 

		get_regions_for_action (rs);

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

			if (find (tmptracks.begin(), tmptracks.end(), tv) == tmptracks.end()) {
				tmptracks.push_back (tv);
			}
		}

		if (tmptracks.empty()) {
			/* no regions selected: do nothing */
			return;
		}

	} else {

		tmptracks = selection->tracks;

	}

	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()->diskstream()->destructive()) {
					continue;
				}
					
				if ((playlist = rtv->playlist()) != 0) {

					XMLNode *before;
					bool got_some;

					before = &(playlist->get_state());
					got_some = false;

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

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


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

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

						playlist->partition ((nframes_t)((*t).start * speed), (nframes_t)((*t).end * speed), true);

						c.disconnect ();

						if (!latest_regionviews.empty()) {
							
							got_some = true;

							rtv->view()->foreach_regionview (bind (sigc::ptr_fun (add_if_covered), &(*t), &new_selection));
							
							if (!in_command) {
								begin_reversible_command (_("separate"));
								in_command = true;
							}
							
							session->add_command(new MementoCommand<Playlist>(*playlist, before, &playlist->get_state()));
							
						} 
					}

					if (!got_some) {
						delete before;
					}
				}
			}
		}
	}

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

		commit_reversible_command ();
	}
}

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 (mouse_mode == MouseRange && !selection->time.empty()) {

		separate_regions_between (selection->time);

	} else {

		nframes64_t start;
		nframes64_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);
}

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

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

	} else {

		nframes64_t start;
		nframes64_t end;

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

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

	if (selection->tracks.empty()) {
		ts = &track_views;
	} else {
		sort_track_selection ();
		ts = &selection->tracks;
	}
	
	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->diskstream()->destructive()) {
				
				if ((playlist = rtv->playlist()) != 0) {
					playlists.push_back (playlist);
				}
			}
		}
	}

	if (playlists.empty()) {
		return;
	}
		
	nframes_t the_start;
	nframes_t the_end;
	nframes_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, region->position());
		if (max_frames - the_start < region->length()) {
			the_end = the_start + region->length() - 1;
		} else {
			the_end = max_frames;
		}
		the_end = min (end, the_end);
		cnt = the_end - the_start + 1;
		
		XMLNode &before = (*i)->get_state();
		region->trim_to (the_start, cnt, this);
		XMLNode &after = (*i)->get_state();
		session->add_command (new MementoCommand<Playlist>(*(*i), &before, &after));
	}
	
	commit_reversible_command ();
}		

void
Editor::region_fill_track ()
{
	nframes_t end;
	RegionSelection rs; 

	get_regions_for_action (rs);

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

	end = session->current_end_frame ();

	begin_reversible_command (_("region fill"));

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

		boost::shared_ptr<Region> region ((*i)->region());
		
		// FIXME
		boost::shared_ptr<AudioRegion> ar = boost::dynamic_pointer_cast<AudioRegion>(region);
		assert(ar);

		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;
		}

		XMLNode &before = pl->get_state();
		pl->add_region (RegionFactory::create (ar), ar->last_frame(), times);
		session->add_command (new MementoCommand<Playlist>(*pl, &before, &pl->get_state()));
	}

	commit_reversible_command ();
}

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

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


	Glib::RefPtr<TreeSelection> selected = region_list_display.get_selection();

	if (selected->count_selected_rows() != 1) {
		return;
	}

	TreeModel::iterator i = region_list_display.get_selection()->get_selected();
	boost::shared_ptr<Region> region = (*i)[region_list_columns.region];

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

	boost::shared_ptr<Playlist> playlist; 

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

	nframes_t selection_length = end - start;
	float times = (float)selection_length / region->length();
	
	begin_reversible_command (_("fill selection"));
	
	for (TrackSelection::iterator i = selection->tracks.begin(); i != selection->tracks.end(); ++i) {

		if ((playlist = (*i)->playlist()) == 0) {
			continue;
		}		
		
                XMLNode &before = playlist->get_state();
		playlist->add_region (RegionFactory::create (region), start, times);
		session->add_command (new MementoCommand<Playlist>(*playlist, &before, &playlist->get_state()));
	}
	
	commit_reversible_command ();			
}

void
Editor::set_region_sync_from_edit_point ()
{
	nframes64_t where = get_preferred_edit_position ();
	RegionSelection rs;
	get_regions_for_action (rs);
	set_sync_point (where, rs);
}

void
Editor::set_sync_point (nframes64_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;
		}

		XMLNode &before = region->playlist()->get_state();
		region->set_sync_position (get_preferred_edit_position());
		XMLNode &after = region->playlist()->get_state();
		session->add_command(new MementoCommand<Playlist>(*(region->playlist()), &before, &after));
	}

	if (in_command) {
		commit_reversible_command ();
	}
}

/** Remove the sync positions of the selection */
void
Editor::remove_region_sync ()
{
	begin_reversible_command (_("remove sync"));

	for (RegionSelection::iterator i = selection->regions.begin(); i != selection->regions.end(); ++i) {
		boost::shared_ptr<Region> r = (*i)->region();
		XMLNode &before = r->playlist()->get_state();
		r->clear_sync_position ();
                XMLNode &after = r->playlist()->get_state();
		session->add_command(new MementoCommand<Playlist>(*(r->playlist()), &before, &after));
	}

	commit_reversible_command ();
}

void
Editor::naturalize ()
{
	RegionSelection rs; 

	get_regions_for_action (rs);

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

	begin_reversible_command (_("naturalize"));
	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
                XMLNode &before = (*i)->region()->get_state();
		(*i)->region()->move_to_natural_position (this);
                XMLNode &after = (*i)->region()->get_state();
		session->add_command (new MementoCommand<Region>(*((*i)->region().get()), &before, &after));
	}
	commit_reversible_command ();
}

void
Editor::align (RegionPoint what)
{
	RegionSelection rs; 

	get_regions_for_action (rs);
	nframes64_t where = get_preferred_edit_position();

	if (!rs.empty()) {
		align_selection (what, where, rs);
	} else {

		RegionSelection rs;
		get_regions_at (rs, where, selection->tracks);
		align_selection (what, where, rs);
	}
}

void
Editor::align_relative (RegionPoint what)
{
	nframes64_t where = get_preferred_edit_position();
	RegionSelection rs; 

	get_regions_for_action (rs);

	if (!rs.empty()) {
		align_selection_relative (what, where, rs);
	} 
}

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

void
Editor::align_selection_relative (RegionPoint point, nframes_t position, const RegionSelection& rs)
{
	if (rs.empty()) {
		return;
	}

	nframes_t distance = 0;
	nframes_t pos = 0;
	int dir = 0;

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

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

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

	/* move first one specially */

	XMLNode &before = r->playlist()->get_state();
	r->set_position (pos, this);
	XMLNode &after = r->playlist()->get_state();
	session->add_command(new MementoCommand<Playlist>(*(r->playlist()), &before, &after));

	/* 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());

                XMLNode &before = region->playlist()->get_state();
		
		if (dir > 0) {
			region->set_position (region->position() + distance, this);
		} else {
			region->set_position (region->position() - distance, this);
		}

                XMLNode &after = region->playlist()->get_state();
		session->add_command(new MementoCommand<Playlist>(*(region->playlist()), &before, &after));

	}

	commit_reversible_command ();
}

void
Editor::align_selection (RegionPoint point, nframes_t position, const RegionSelection& rs)
{
	if (rs.empty()) {
		return;
	}

	begin_reversible_command (_("align selection"));

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

	commit_reversible_command ();
}

void
Editor::align_region (boost::shared_ptr<Region> region, RegionPoint point, nframes_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, nframes_t position)
{
	XMLNode &before = region->playlist()->get_state();

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

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

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

	XMLNode &after = region->playlist()->get_state();
	session->add_command(new MementoCommand<Playlist>(*(region->playlist()), &before, &after));
}	

/** 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_for_action (rs);

	begin_reversible_command (str);

	for (RegionSelection::iterator x = rs.begin(); x != rs.end(); ++x) {
		AudioRegionView* arv = dynamic_cast<AudioRegionView*> (*x);

		if (!arv) {
			continue;
		}

		/* require region to span proposed trim */

		switch (arv->region()->coverage (loc.start(), loc.end())) {
		case OverlapInternal:
			break;
		default:
			continue;
		}
				
		AudioTimeAxisView* atav = dynamic_cast<AudioTimeAxisView*> (&arv->get_time_axis_view());

		if (!atav) {
			return;
		}

		float speed = 1.0;
		nframes_t start;
		nframes_t end;

		if (atav->get_diskstream() != 0) {
			speed = atav->get_diskstream()->speed();
		}
		
		start = session_frame_to_track_frame (loc.start(), speed);
		end = session_frame_to_track_frame (loc.end(), speed);

		XMLNode &before = arv->region()->playlist()->get_state();
		arv->region()->trim_to (start, (end - start), this);
		XMLNode &after = arv->region()->playlist()->get_state();
		session->add_command(new MementoCommand<Playlist>(*(arv->region()->playlist()), &before, &after));
	}

	commit_reversible_command ();
}

void
Editor::trim_region_to_edit_point ()
{
	RegionSelection rs;
	
	get_regions_for_action (rs);

	nframes64_t where = get_preferred_edit_position();

	begin_reversible_command (_("trim region start to edit point"));

	for (RegionSelection::iterator x = rs.begin(); x != rs.end(); ++x) {
		AudioRegionView* arv = dynamic_cast<AudioRegionView*> (*x);

		if (!arv) {
			continue;
		}

		/* require region to cover trim */

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

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

		if (!atav) {
			return;
		}

		float speed = 1.0;

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

		XMLNode &before = arv->region()->playlist()->get_state();
		arv->region()->trim_end( session_frame_to_track_frame(where, speed), this);
		XMLNode &after = arv->region()->playlist()->get_state();
		session->add_command(new MementoCommand<Playlist>(*(arv->region()->playlist()), &before, &after));
	}
		
	commit_reversible_command ();
}

void
Editor::trim_region_from_edit_point ()
{
	RegionSelection rs;

	get_regions_for_action (rs);

	nframes64_t where = get_preferred_edit_position();

	begin_reversible_command (_("trim region end to edit point"));

	for (RegionSelection::iterator x = rs.begin(); x != rs.end(); ++x) {
		AudioRegionView* arv = dynamic_cast<AudioRegionView*> (*x);

		if (!arv) {
			continue;
		}

		/* require region to cover trim */

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

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

		if (!atav) {
			return;
		}

		float speed = 1.0;

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

		XMLNode &before = arv->region()->playlist()->get_state();
		arv->region()->trim_front ( session_frame_to_track_frame(where, speed), this);
		XMLNode &after = arv->region()->playlist()->get_state();
		session->add_command(new MementoCommand<Playlist>(*(arv->region()->playlist()), &before, &after));
	}
		
	commit_reversible_command ();
}

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

void*
Editor::_freeze_thread (void* arg)
{
	PBD::ThreadCreated (pthread_self(), X_("Freeze"));
	return static_cast<Editor*>(arg)->freeze_thread ();
}

void*
Editor::freeze_thread ()
{
	clicked_routeview->audio_track()->freeze (*current_interthread_info);
	return 0;
}

gint
Editor::freeze_progress_timeout (void *arg)
{
	interthread_progress_bar.set_fraction (current_interthread_info->progress/100);
	return !(current_interthread_info->done || current_interthread_info->cancel);
}

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

	if (interthread_progress_window == 0) {
		build_interthread_progress_window ();
	}

	WindowTitle title(Glib::get_application_name());
	title += _("Freeze");
	interthread_progress_window->set_title (title.get_string());
	interthread_progress_window->set_position (Gtk::WIN_POS_MOUSE);
	interthread_progress_window->show_all ();
	interthread_progress_bar.set_fraction (0.0f);
	interthread_progress_label.set_text ("");
	interthread_cancel_label.set_text (_("Cancel Freeze"));
	current_interthread_info = &itt;

	interthread_progress_connection = 
	  Glib::signal_timeout().connect (bind (mem_fun(*this, &Editor::freeze_progress_timeout), (gpointer) 0), 100);

	itt.done = false;
	itt.cancel = false;
	itt.progress = 0.0f;
	
	pthread_attr_t attr;
	pthread_attr_init(&attr);
	pthread_attr_setstacksize(&attr, 500000);

	pthread_create (&itt.thread, &attr, _freeze_thread, this);

	pthread_attr_destroy(&attr);

	track_canvas->get_window()->set_cursor (Gdk::Cursor (Gdk::WATCH));

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

	interthread_progress_connection.disconnect ();
	interthread_progress_window->hide_all ();
	current_interthread_info = 0;
	track_canvas->get_window()->set_cursor (*current_canvas_cursor);
}

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

	TrackSelection views = selection->tracks;

	nframes_t start = selection->time[clicked_selection].start;
	nframes_t end = selection->time[clicked_selection].end;
	nframes_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;
		
		itt.done = false;
		itt.cancel = false;
		itt.progress = false;

		XMLNode &before = playlist->get_state();
		rtv->track()->bounce_range (start, cnt, itt);
		XMLNode &after = playlist->get_state();
		session->add_command (new MementoCommand<Playlist> (*playlist, &before, &after));
	}
	
	commit_reversible_command ();
}

/** 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 (current_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 Cut:
		opname = _("cut");
		break;
	case Copy:
		opname = _("copy");
		break;
	case Clear:
		opname = _("clear");
		break;
	}
	
	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 (bind (mem_fun(*this, &Editor::really_remove_marker), loc));
		}

		return;
	}

	RegionSelection rs; 

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

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

	switch (current_mouse_mode()) {
	case MouseObject: 
		if (!rs.empty() || !selection->points.empty()) {

			begin_reversible_command (opname + _(" objects"));

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

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

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

			commit_reversible_command ();	
			break; // terminate case statement here
		} 
		if (!selection->time.empty()) {
			/* don't cause suprises */
			break;
		}
		// fall thru if there was nothing selected
		
	case MouseRange:
		if (selection->time.empty()) {
			nframes64_t start, end;
			if (!get_edit_op_range (start, end)) {
				return;
			}
			selection->set ((TimeAxisView*) 0, start, end);
		}
			
		begin_reversible_command (opname + _(" range"));
		cut_copy_ranges (op);
		commit_reversible_command ();
		
		if (op == Cut) {
			selection->clear_time ();
		}

		break;
		
	default:
		break;
	}
}

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

		AutomationTimeAxisView* atv = dynamic_cast<AutomationTimeAxisView*>(&(*i).track);

		if (atv) {
			atv->cut_copy_clear_objects (selection->points, op);
		} 
	}
}

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

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) {}
};


/** 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;

	nframes_t first_position = max_frames;
	
	set<PlaylistState, lt_playlist> freezelist;
	pair<set<PlaylistState, lt_playlist>::iterator,bool> insert_result;
	
	/* 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 ((*x)->region()->position(), first_position);

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

			if (pl) {

				PlaylistState before;
				before.playlist = pl;
				before.before = &pl->get_state();
				
				insert_result = freezelist.insert (before);
				
				if (insert_result.second) {
					pl->freeze ();
				}
			}
		}

		TimeAxisView* tv = &(*x)->get_trackview();
		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) {
			/* impossible, but this handles it for the future */
			continue;
		}

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

		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 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;
	}
	
	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) {
		(*i).pl->thaw();
		foo.push_back ((*i).pl);
	}
	

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

	for (set<PlaylistState, lt_playlist>::iterator pl = freezelist.begin(); pl != freezelist.end(); ++pl) {
		(*pl).playlist->thaw ();
		session->add_command (new MementoCommand<Playlist>(*(*pl).playlist, (*pl).before, &(*pl).playlist->get_state()));
	}
}

void
Editor::cut_copy_ranges (CutCopyOp op)
{
	TrackSelection* ts;
	TrackSelection entered;

	if (selection->tracks.empty()) {
		if (!entered_track) {
			return;
		}
		entered.push_back (entered_track);
		ts = &entered;
	} else {
		ts = &selection->tracks;
	}

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

void
Editor::paste (float times)
{
	paste_internal (get_preferred_edit_position(), times);
}

void
Editor::mouse_paste ()
{
	nframes64_t where;
	bool ignored;

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

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

void
Editor::paste_internal (nframes_t position, float times)
{
	bool commit = false;

	if (cut_buffer->empty()) {
		return;
	}

	if (position == max_frames) {
		position = get_preferred_edit_position();
	}

	begin_reversible_command (_("paste"));

	TrackSelection ts;
	TrackSelection::iterator i;
	size_t nth;

	/* get everything in the correct order */


	if (!selection->tracks.empty()) {
		sort_track_selection ();
		ts = selection->tracks;
	} else if (entered_track) {
		ts.push_back (entered_track);
	}

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

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

		if ((*i)->paste (position, times, *cut_buffer, nth)) {
			commit = true;
		}
	}
	
	if (commit) {
		commit_reversible_command ();
	}
}

void
Editor::paste_named_selection (float times)
{
	TrackSelection::iterator t;

	Glib::RefPtr<TreeSelection> selected = named_selection_display.get_selection();

	if (selected->count_selected_rows() != 1 || selection->tracks.empty()) {
		return;
	}

	TreeModel::iterator i = selected->get_selected();
	NamedSelection* ns = (*i)[named_selection_columns.selection];

	list<boost::shared_ptr<Playlist> >::iterator chunk;
	list<boost::shared_ptr<Playlist> >::iterator tmp;

	chunk = ns->playlists.begin();
		
	begin_reversible_command (_("paste chunk"));
	
	sort_track_selection ();

	for (t = selection->tracks.begin(); t != selection->tracks.end(); ++t) {
		
		RouteTimeAxisView* rtv;
		boost::shared_ptr<Playlist> pl;
		boost::shared_ptr<AudioPlaylist> apl;

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

		if ((pl = rtv->playlist()) == 0) {
			continue;
		}
		
		if ((apl = boost::dynamic_pointer_cast<AudioPlaylist> (pl)) == 0) {
			continue;
		}

		tmp = chunk;
		++tmp;

		XMLNode &before = apl->get_state();
		apl->paste (*chunk, get_preferred_edit_position(), times);
		session->add_command(new MementoCommand<AudioPlaylist>(*apl, &before, &apl->get_state()));

		if (tmp != ns->playlists.end()) {
			chunk = tmp;
		}
	}

	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;

	begin_reversible_command (_("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 (mem_fun(*this, &Editor::collect_new_region_view));
		
 		playlist = (*i)->region()->playlist();
                XMLNode &before = playlist->get_state();
		playlist->duplicate (r, r->last_frame(), times);
		session->add_command(new MementoCommand<Playlist>(*playlist, &before, &playlist->get_state()));

		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();

	for (TrackSelection::iterator i = selection->tracks.begin(); i != selection->tracks.end(); ++i) {
		if ((playlist = (*i)->playlist()) == 0) {
			continue;
		}
		XMLNode &before = playlist->get_state();
		playlist->duplicate (*ri, selection->time[clicked_selection].end, times);
		XMLNode &after = playlist->get_state();
		session->add_command (new MementoCommand<Playlist>(*playlist, &before, &after));

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

	commit_reversible_command ();
}

void
Editor::reset_point_selection ()
{
	/* reset all selected points to the relevant default value */

	for (PointSelection::iterator i = selection->points.begin(); i != selection->points.end(); ++i) {
		
		AutomationTimeAxisView* atv = dynamic_cast<AutomationTimeAxisView*>(&(*i).track);
		
		if (atv) {
			atv->reset_objects (selection->points);
		} 
	}
}

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);
}

void
Editor::clear_playlist (boost::shared_ptr<Playlist> playlist)
{
	begin_reversible_command (_("clear playlist"));
        XMLNode &before = playlist->get_state();
	playlist->clear ();
        XMLNode &after = playlist->get_state();
	session->add_command (new MementoCommand<Playlist>(*playlist.get(), &before, &after));
	commit_reversible_command ();
}

void
Editor::nudge_track (bool use_edit, bool forwards)
{
	boost::shared_ptr<Playlist> playlist; 
	nframes_t distance;
	nframes_t next_distance;
	nframes_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"));
	
	for (TrackSelection::iterator i = selection->tracks.begin(); i != selection->tracks.end(); ++i) {

		if ((playlist = (*i)->playlist()) == 0) {
			continue;
		}		
		
                XMLNode &before = playlist->get_state();
		playlist->nudge_after (start, distance, forwards);
                XMLNode &after = playlist->get_state();
		session->add_command (new MementoCommand<Playlist>(*playlist, &before, &after));
	}
	
	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 (prompt, choices);
		
		if (prompter.run () == 1) {
			session->remove_last_capture ();
		}

	} else {
		session->remove_last_capture();
	}
}

void
Editor::normalize_region ()
{
	RegionSelection rs; 

	get_regions_for_action (rs);
	
	if (!session) {
		return;
	}

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

	begin_reversible_command (_("normalize"));

	track_canvas->get_window()->set_cursor (*wait_cursor);
	gdk_flush ();

	for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ++r) {
		AudioRegionView* const arv = dynamic_cast<AudioRegionView*>(*r);
		if (!arv)
			continue;
 		XMLNode &before = arv->region()->get_state();
		arv->audio_region()->normalize_to (0.0f);
		session->add_command (new MementoCommand<Region>(*(arv->region().get()), &before, &arv->region()->get_state()));
	}

	commit_reversible_command ();
	track_canvas->get_window()->set_cursor (*current_canvas_cursor);
}


void
Editor::denormalize_region ()
{
	if (!session) {
		return;
	}

	RegionSelection rs; 

	get_regions_for_action (rs);

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

	begin_reversible_command ("denormalize");

	for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ++r) {
		AudioRegionView* const arv = dynamic_cast<AudioRegionView*>(*r);
		if (!arv)
			continue;
		XMLNode &before = arv->region()->get_state();
		arv->audio_region()->set_scale_amplitude (1.0f);
		session->add_command (new MementoCommand<Region>(*(arv->region().get()), &before, &arv->region()->get_state()));
	}

	commit_reversible_command ();
}

void
Editor::adjust_region_scale_amplitude (bool up)
{
	if (!session) {
		return;
	}

	RegionSelection rs; 

	get_regions_for_action (rs);

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

	begin_reversible_command ("denormalize");

	for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ++r) {
		AudioRegionView* const arv = dynamic_cast<AudioRegionView*>(*r);
		if (!arv)
			continue;
		XMLNode &before = arv->region()->get_state();
		
		double fraction = gain_to_slider_position (arv->audio_region()->scale_amplitude ());
		
		if (up) {
			fraction += 0.05;
			fraction = min (fraction, 1.0);
		} else {
			fraction -= 0.05;
			fraction = max (fraction, 0.0);
		}

		if (!up && fraction <= 0) {
			continue;
		}

		fraction = slider_position_to_gain (fraction);
		fraction = coefficient_to_dB (fraction);
		fraction = dB_to_coefficient (fraction);

		if (up && fraction >= 2.0) {
			continue;
		}
		
		arv->audio_region()->set_scale_amplitude (fraction);
		session->add_command (new MementoCommand<Region>(*(arv->region().get()), &before, &arv->region()->get_state()));
	}

	commit_reversible_command ();
}


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

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


void
Editor::quantize_region ()
{
	if (!session) {
		return;
	}

	// FIXME: varying meter?
	Quantize quant (*session, snap_length_beats(0));
	apply_filter (quant, _("quantize regions"));
}

void
Editor::apply_filter (Filter& filter, string command)
{
	RegionSelection rs; 

	get_regions_for_action (rs);

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

	begin_reversible_command (command);

	track_canvas->get_window()->set_cursor (*wait_cursor);
	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) {
			if (mrv->midi_region()->apply(filter) == 0) {
				mrv->redisplay_model();
			}
		}

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

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

				XMLNode &before = playlist->get_state();
				playlist->replace_region (arv->region(), filter.results.front(), arv->region()->position());
				XMLNode &after = playlist->get_state();
				session->add_command(new MementoCommand<Playlist>(*playlist, &before, &after));
			} else {
				goto out;
			}
		}

		r = tmp;
	}

	commit_reversible_command ();
	rs.clear ();

  out:
	track_canvas->get_window()->set_cursor (*current_canvas_cursor);
}

void
Editor::region_selection_op (void (Region::*pmf)(void))
{
	for (RegionSelection::iterator i = selection->regions.begin(); i != selection->regions.end(); ++i) {
		Region* region = (*i)->region().get();
		(region->*pmf)();
	}
}


void
Editor::region_selection_op (void (Region::*pmf)(void*), void *arg)
{
	for (RegionSelection::iterator i = selection->regions.begin(); i != selection->regions.end(); ++i) {
		Region* region = (*i)->region().get();
		(region->*pmf)(arg);
	}
}

void
Editor::region_selection_op (void (Region::*pmf)(bool), bool yn)
{
	for (RegionSelection::iterator i = selection->regions.begin(); i != selection->regions.end(); ++i) {
		Region* region = (*i)->region().get();
		(region->*pmf)(yn);
	}
}

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

void
Editor::brush (nframes_t pos)
{
	RegionSelection sel;
	RegionSelection rs; 

	get_regions_for_action (rs);

	snap_to (pos);

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

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
		mouse_brush_insert_region ((*i), pos);
	}
}

void
Editor::reset_region_gain_envelopes ()
{
	RegionSelection rs; 

	get_regions_for_action (rs);

	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::toggle_gain_envelope_visibility ()
{
	RegionSelection rs; 

	get_regions_for_action (rs);

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

void
Editor::toggle_gain_envelope_active ()
{
	RegionSelection rs; 

	get_regions_for_action (rs);

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

void
Editor::toggle_region_lock ()
{
	RegionSelection rs; 

	get_regions_for_action (rs);

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
		(*i)->region()->set_locked (!(*i)->region()->locked());
	}
}

void
Editor::set_region_lock_style (Region::PositionLockStyle ps)
{
	RegionSelection rs; 

	get_regions_for_action (rs);

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
		(*i)->region()->set_position_lock_style (ps);
	}
}


void
Editor::toggle_region_mute ()
{
	RegionSelection rs; 

	get_regions_for_action (rs);

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
		(*i)->region()->set_muted (!(*i)->region()->muted());
	}
}

void
Editor::toggle_region_opaque ()
{
	RegionSelection rs; 

	get_regions_for_action (rs);

	for (RegionSelection::iterator i = rs.begin(); i != rs.end(); ++i) {
		(*i)->region()->set_opaque (!(*i)->region()->opaque());
	}
}

void
Editor::set_fade_length (bool in)
{
	RegionSelection rs; 

	get_regions_for_action (rs);

	/* we need a region to measure the offset from the start */

	RegionView* rv;

	if (!rs.empty()) {
		rv = rs.front();
	} else if (entered_regionview) {
		rv = entered_regionview;
	} else {
		return;
	}

	nframes64_t pos = get_preferred_edit_position();
	nframes_t len;
	char* 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::toggle_fade_active (bool in)
{
	RegionSelection rs; 

	get_regions_for_action (rs);

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

	const char* cmd = (in ? _("toggle fade in active") : _("toggle fade out active"));
	bool have_switch = false;
	bool yn = false;

	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<AudioRegion> region (tmp->audio_region());

		/* make the behaviour consistent across all regions */
		
		if (!have_switch) {
			if (in) {
				yn = region->fade_in_active();
			} else {
				yn = region->fade_out_active();
			}
			have_switch = true;
		}

		XMLNode &before = region->get_state();
		if (in) {
			region->set_fade_in_active (!yn);
		} else {
			region->set_fade_out_active (!yn);
		}
		XMLNode &after = region->get_state();
		session->add_command(new MementoCommand<AudioRegion>(*region.get(), &before, &after));
	}

	commit_reversible_command ();
}

void
Editor::set_fade_in_shape (AudioRegion::FadeShape shape)
{
	RegionSelection rs; 

	get_regions_for_action (rs);

	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 (AudioRegion::FadeShape shape)
{
	RegionSelection rs; 

	get_regions_for_action (rs);

	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_for_action (rs);

	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());

		XMLNode &before = ar->get_state();

		ar->set_fade_in_active (yn);
		
		XMLNode &after = ar->get_state();
		session->add_command(new MementoCommand<AudioRegion>(*ar, &before, &after));
	}

	commit_reversible_command ();
}

void
Editor::set_fade_out_active (bool yn)
{
	RegionSelection rs; 

	get_regions_for_action (rs);

	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());

		XMLNode &before = ar->get_state();

		ar->set_fade_out_active (yn);
		
		XMLNode &after = ar->get_state();
		session->add_command(new MementoCommand<AudioRegion>(*ar, &before, &after));
	}

	commit_reversible_command ();
}


/** Update crossfade visibility after its configuration has been changed */
void
Editor::update_xfade_visibility ()
{
	_xfade_visibility = Config->get_xfades_visible ();
	
	for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
		AudioTimeAxisView* v = dynamic_cast<AudioTimeAxisView*>(*i);
		if (v) {
			if (_xfade_visibility) {
				v->show_all_xfades ();
			} else {
				v->hide_all_xfades ();
			}
		}
	}
}

void
Editor::set_edit_point ()
{
	nframes64_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 {
		nframes64_t where;
		bool ignored;

		if (!mouse_frame (where, ignored)) {
			return;
		}
			
		snap_to (where);
		
		if (session) {
			session->request_locate (where, session->transport_rolling());
		}
	}
}

void
Editor::split ()
{
	RegionSelection rs; 
	
	get_regions_for_action (rs);

	nframes64_t where = get_preferred_edit_position();

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

	split_regions_at (where, rs);
}

void
Editor::ensure_entered_track_selected (bool op_really_wants_one_track_if_none_are_selected)
{
	if (entered_track && mouse_mode == MouseObject) {
		if (!selection->tracks.empty()) {
			if (!selection->selected (entered_track)) {
				selection->add (entered_track);
			}
		} else {
			/* there is no selection, but this operation requires/prefers selected objects */

			if (op_really_wants_one_track_if_none_are_selected) {
				selection->set (entered_track);
			}
		}
	}
}

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

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

void
Editor::trim_region (bool front)
{
	nframes64_t where = get_preferred_edit_position();
	RegionSelection rs;

	get_regions_for_action (rs);

	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()) {
			boost::shared_ptr<Playlist> pl = (*i)->region()->playlist();
			XMLNode &before = pl->get_state();
			if (front) {
				(*i)->region()->trim_front (where, this);	
			} else {
				(*i)->region()->trim_end (where, this);	
			}
			XMLNode &after = pl->get_state();
			session->add_command(new MementoCommand<Playlist>(*pl.get(), &before, &after));
		}
	}

	commit_reversible_command ();
}

struct EditorOrderRouteSorter {
    bool operator() (boost::shared_ptr<Route> a, boost::shared_ptr<Route> b) {
	    /* use of ">" forces the correct sort order */
	    return a->order_key ("editor") < b->order_key ("editor");
    }
};

void
Editor::select_next_route()
{
	if (selection->tracks.empty()) {
		selection->set (track_views.front());
		return;
	}

	TimeAxisView* current = selection->tracks.front();

	for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
		if (*i == current) {
			++i;
			if (i != track_views.end()) {
				selection->set (*i);
			} else {
				selection->set (*(track_views.begin()));
			}
			break;
		}
	}
}

void
Editor::select_prev_route()
{
	if (selection->tracks.empty()) {
		selection->set (track_views.front());
		return;
	}

	TimeAxisView* current = selection->tracks.front();

	for (TrackViewList::reverse_iterator i = track_views.rbegin(); i != track_views.rend(); ++i) {
		if (*i == current) {
			++i;
			if (i != track_views.rend()) {
				selection->set (*i);
			} else {
				selection->set (*(track_views.rbegin()));
			}
			break;
		}
	}
}

void
Editor::set_loop_from_selection (bool play)
{
	if (session == 0 || selection->time.empty()) {
		return;
	}

	nframes_t start = selection->time[clicked_selection].start;
	nframes_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;
	}

	nframes64_t start;
	nframes64_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)
{
	nframes64_t start = max_frames;
	nframes64_t end = 0;

	RegionSelection rs; 

	get_regions_for_action (rs);

	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;
	}

	nframes_t start = selection->time[clicked_selection].start;
	nframes_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;
	}

	nframes64_t start;
	nframes64_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 ()
{
	nframes64_t start = max_frames;
	nframes64_t end = 0;

	RegionSelection rs; 

	get_regions_for_action (rs);

	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_regions ()
{
	RegionSelection rs; 

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

	pitch_shift (rs, 1.2);
}
	
void
Editor::use_region_as_bar ()
{
	if (!session) {
		return;
	}

	RegionSelection rs; 

	get_regions_for_action (rs);

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

	RegionView* rv = rs.front();

	define_one_bar (rv->region()->position(), rv->region()->last_frame() + 1);
}

void
Editor::use_range_as_bar ()
{
	nframes64_t start, end;
	if (get_edit_op_range (start, end)) {
		define_one_bar (start, end);
	}
}

void
Editor::define_one_bar (nframes64_t start, nframes64_t end)
{
	nframes64_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 ...
	*/

	double frames_per_beat = length / m.beats_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 (_("Do you want to set the global tempo or add 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 {
		session->tempo_map().add_tempo (Tempo (beats_per_minute, t.note_type()), start);
	}

	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;

	if (!session) {
		return;
	}

	RegionSelection rs; 

	get_regions_for_action (rs);

	if (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 use_rhythmic_rodent = false;

	boost::shared_ptr<Playlist> pl = r->playlist();
	
	if (!pl) {
		return;
	}
	
	if (positions.empty()) {
		return;
	}


	if (positions.size() > 20) {
		Glib::ustring 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;	
	
	nframes64_t pos = r->position();

	XMLNode& before (pl->get_state());
	
	x = positions.begin();
	
	while (x != positions.end()) {
		if ((*x) > pos) {
			break;
		}
		++x;
	}
	
	if (x == positions.end()) {
		return;
	}
	
	pl->freeze ();
	pl->remove_region (r);
	
	while (x != positions.end()) {
		
		/* file start = original start + how far we from the initial position ? 
		 */
		
		nframes64_t file_start = r->start() + (pos - r->position());

		/* length = next position - current position
		 */
		
		nframes64_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 (session->region_name (new_name, r->name())) {
			break;
		}
		
		/* do NOT announce new regions 1 by one, just wait till they are all done */

		boost::shared_ptr<Region> nr = RegionFactory::create (r->sources(), file_start, len, new_name, 0, Region::DefaultFlags, false);
		pl->add_region (nr, pos);

		pos += len;
		++x;

		if (*x > r->last_frame()) {

			/* add final fragment */
			
			file_start = r->start() + (pos - r->position());
			len = r->last_frame() - pos;

			nr = RegionFactory::create (r->sources(), file_start, len, new_name, 0, Region::DefaultFlags);
			pl->add_region (nr, pos);

			break;
		}
	} 

	pl->thaw ();

	XMLNode& after (pl->get_state());
	
	session->add_command (new MementoCommand<Playlist>(*pl, &before, &after));
}

void
Editor::tab_to_transient (bool forward)
{
	AnalysisFeatureList positions;

	if (!session) {
		return;
	}

	nframes64_t pos = session->audible_frame ();

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

		for (TrackSelection::iterator t = selection->tracks.begin(); t != selection->tracks.end(); ++t) {

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

			if (rtv) {
				boost::shared_ptr<Diskstream> ds = rtv->get_diskstream();
				if (ds) {
					boost::shared_ptr<Playlist> pl = rtv->get_diskstream()->playlist ();
					if (pl) {
						nframes64_t result = pl->find_next_transient (pos, forward ? 1 : -1);
						
						if (result >= 0) {
							positions.push_back (result);
						}
					}
				}
			}
		}

	} else {
		
		RegionSelection rs; 

		get_regions_for_action (rs);
	
		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;
	nframes64_t pos = playhead_cursor->current_frame;
	if (pos < max_frames) {
		pos++;
		snap_to_internal (pos, 1, false);
		session->request_locate (pos);
	}
}


void
Editor::playhead_backward_to_grid ()
{
	if (!session) return;
	nframes64_t pos = playhead_cursor->current_frame;
	if (pos > 1) {
		pos--;
		snap_to_internal (pos, -1, false);
		session->request_locate (pos);
	}
}

void
Editor::set_track_height (TimeAxisView::TrackHeight h)
{
	TrackSelection& ts (selection->tracks);

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

	for (TrackSelection::iterator x = ts.begin(); x != ts.end(); ++x) {
		(*x)->set_height (h);
	}
}

void
Editor::set_track_height_largest ()
{
	set_track_height (TimeAxisView::Largest);
}
void
Editor::set_track_height_large ()
{
	set_track_height (TimeAxisView::Large);
}
void
Editor::set_track_height_larger ()
{
	set_track_height (TimeAxisView::Larger);
}
void
Editor::set_track_height_normal ()
{
	set_track_height (TimeAxisView::Normal);
}
void
Editor::set_track_height_smaller ()
{
	set_track_height (TimeAxisView::Smaller);
}
void
Editor::set_track_height_small ()
{
	set_track_height (TimeAxisView::Small);
}

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);
		}
	}
}

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;

	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 (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!"),
						  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!"),
						  ntracks, trackstr);
		}
	} else if (nbusses) {
		prompt  = string_compose (_("Do you really want to remove %1 %2?"),
					  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."));
	}

	Choice prompter (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::set_waveform_scale (WaveformScale ws)
{
	TrackSelection& ts (selection->tracks);

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

	for (TrackSelection::iterator x = ts.begin(); x != ts.end(); ++x) {
		AudioTimeAxisView* atv = dynamic_cast<AudioTimeAxisView*> (*x);
		if (atv) {
			atv->set_waveform_scale (ws);
		}
	}
}	

void
Editor::do_insert_time ()
{
	if (selection->tracks.empty()) {
		return;
	}

	nframes64_t pos = get_preferred_edit_position ();
	ArdourDialog d (*this, _("Insert Time"));
	VButtonBox button_box;
	VBox option_box;
	RadioButtonGroup group;
	RadioButton leave_button (group, _("Stay in position"));
	RadioButton move_button (group, _("Move"));
	RadioButton split_button (group, _("Split & Later Section Moves"));
	Label intersect_option_label (_("Intersected regions should:"));
	ToggleButton glue_button (_("Move Glued Regions"));
	AudioClock clock ("insertTimeClock", true, X_("InsertTimeClock"), true, true, true);
	HBox clock_box;

	clock.set (0);
	clock.set_session (session);
	clock.set_bbt_reference (pos);

	clock_box.pack_start (clock, false, true);

	option_box.set_spacing (6);
	option_box.pack_start (intersect_option_label, false, false);
	option_box.pack_start (button_box, false, false);
	option_box.pack_start (glue_button, false, false);

	button_box.pack_start (leave_button, false, false);
	button_box.pack_start (move_button, false, false);
	button_box.pack_start (split_button, false, false);
				      
	d.get_vbox()->set_border_width (12);
	d.get_vbox()->pack_start (clock_box, false, false);
	d.get_vbox()->pack_start (option_box, false, false);
	
	leave_button.show ();
	move_button.show ();
	split_button.show ();
	intersect_option_label.show ();
	option_box.show ();
	button_box.show ();
	glue_button.show ();
	clock.show_all();
	clock_box.show ();

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

	int response = d.run ();

	if (response != RESPONSE_OK) {
		return;
	}
	
	nframes_t distance = clock.current_duration (pos);

	if (distance == 0) {
		return;
	}

	InsertTimeOption opt;

	if (leave_button.get_active()) {
		opt = LeaveIntersected;
	} else if (move_button.get_active()) {
		opt = MoveIntersected;
	} else {
		opt = SplitIntersected;
	}

	insert_time (pos, distance, opt, glue_button.get_active());
}
				
void
Editor::insert_time (nframes64_t pos, nframes64_t frames, InsertTimeOption opt, bool ignore_music_glue)
{
	bool commit = false;

	if (Config->get_edit_mode() == Lock) {
		return;
	}

	begin_reversible_command (_("insert time"));

	for (TrackSelection::iterator x = selection->tracks.begin(); x != selection->tracks.end(); ++x) {
		boost::shared_ptr<Playlist> pl = (*x)->playlist();
		
		if (!pl) {
			continue;
		}

		XMLNode &before = pl->get_state();

		if (opt == SplitIntersected) {
			pl->split (pos);
		}
		
		pl->shift (pos, frames, (opt == MoveIntersected), ignore_music_glue);

		XMLNode &after = pl->get_state();

		session->add_command (new MementoCommand<Playlist> (*pl, &before, &after));
		commit = true;
	}

	if (commit) {
		commit_reversible_command ();
	}
}