livetrax/gtk2_ardour/editor.cc

/*
    Copyright (C) 2000-2009 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 <stdint.h>
#include <unistd.h>
#include <cstdlib>
#include <cmath>
#include <string>
#include <algorithm>
#include <map>

#include "ardour_ui.h"
/*
 * ardour_ui.h include was moved to the top of the list
 * due to a conflicting definition of 'Style' between
 * Apple's MacTypes.h and BarController.
 */

#include <boost/none.hpp>

#include <sigc++/bind.h>

#include "pbd/convert.h"
#include "pbd/error.h"
#include "pbd/enumwriter.h"
#include "pbd/memento_command.h"
#include "pbd/unknown_type.h"

#include <glibmm/miscutils.h>
#include <gtkmm/image.h>
#include <gdkmm/color.h>
#include <gdkmm/bitmap.h>

#include "gtkmm2ext/bindings.h"
#include "gtkmm2ext/grouped_buttons.h"
#include "gtkmm2ext/gtk_ui.h"
#include "gtkmm2ext/tearoff.h"
#include "gtkmm2ext/utils.h"
#include "gtkmm2ext/window_title.h"
#include "gtkmm2ext/choice.h"
#include "gtkmm2ext/cell_renderer_pixbuf_toggle.h"

#include "ardour/audio_diskstream.h"
#include "ardour/audio_track.h"
#include "ardour/audioplaylist.h"
#include "ardour/audioregion.h"
#include "ardour/location.h"
#include "ardour/midi_region.h"
#include "ardour/plugin_manager.h"
#include "ardour/profile.h"
#include "ardour/route_group.h"
#include "ardour/session_directory.h"
#include "ardour/session_route.h"
#include "ardour/session_state_utils.h"
#include "ardour/tempo.h"
#include "ardour/utils.h"
#include "ardour/session_playlists.h"
#include "ardour/audioengine.h"

#include "control_protocol/control_protocol.h"

#include "actions.h"
#include "actions.h"
#include "analysis_window.h"
#include "audio_clock.h"
#include "audio_region_view.h"
#include "audio_streamview.h"
#include "audio_time_axis.h"
#include "automation_time_axis.h"
#include "bundle_manager.h"
#include "canvas-noevent-text.h"
#include "canvas_impl.h"
#include "crossfade_edit.h"
#include "crossfade_view.h"
#include "debug.h"
#include "editing.h"
#include "editor.h"
#include "editor_cursors.h"
#include "editor_drag.h"
#include "editor_group_tabs.h"
#include "editor_locations.h"
#include "editor_regions.h"
#include "editor_route_groups.h"
#include "editor_routes.h"
#include "editor_snapshots.h"
#include "editor_summary.h"
#include "global_port_matrix.h"
#include "gui_object.h"
#include "gui_thread.h"
#include "keyboard.h"
#include "marker.h"
#include "midi_time_axis.h"
#include "mixer_strip.h"
#include "mouse_cursors.h"
#include "playlist_selector.h"
#include "public_editor.h"
#include "region_layering_order_editor.h"
#include "rgb_macros.h"
#include "rhythm_ferret.h"
#include "selection.h"
#include "sfdb_ui.h"
#include "simpleline.h"
#include "tempo_lines.h"
#include "time_axis_view.h"
#include "utils.h"

#include "i18n.h"

#ifdef WITH_CMT
#include "imageframe_socket_handler.h"
#endif

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

using PBD::internationalize;
using PBD::atoi;
using Gtkmm2ext::Keyboard;

const double Editor::timebar_height = 15.0;

static const gchar *_snap_type_strings[] = {
	N_("CD Frames"),
	N_("Timecode Frames"),
	N_("Timecode Seconds"),
	N_("Timecode Minutes"),
	N_("Seconds"),
	N_("Minutes"),
	N_("Beats/32"),
	N_("Beats/28"),
	N_("Beats/24"),
	N_("Beats/20"),
	N_("Beats/16"),
	N_("Beats/14"),
	N_("Beats/12"),
	N_("Beats/10"),
	N_("Beats/8"),
	N_("Beats/7"),
	N_("Beats/6"),
	N_("Beats/5"),
	N_("Beats/4"),
	N_("Beats/3"),
	N_("Beats/2"),
	N_("Beats"),
	N_("Bars"),
	N_("Marks"),
	N_("Region starts"),
	N_("Region ends"),
	N_("Region syncs"),
	N_("Region bounds"),
	0
};

static const gchar *_snap_mode_strings[] = {
	N_("No Grid"),
	N_("Grid"),
	N_("Magnetic"),
	0
};

static const gchar *_edit_point_strings[] = {
	N_("Playhead"),
	N_("Marker"),
	N_("Mouse"),
	0
};

static const gchar *_zoom_focus_strings[] = {
	N_("Left"),
	N_("Right"),
	N_("Center"),
	N_("Playhead"),
 	N_("Mouse"),
 	N_("Edit point"),
	0
};

#ifdef USE_RUBBERBAND
static const gchar *_rb_opt_strings[] = {
	N_("Mushy"),
	N_("Smooth"),
	N_("Balanced multitimbral mixture"),
	N_("Unpitched percussion with stable notes"),
	N_("Crisp monophonic instrumental"),
	N_("Unpitched solo percussion"),
	N_("Resample without preserving pitch"),
	0
};
#endif

void
show_me_the_size (Requisition* r, const char* what)
{
	cerr << "size of " << what << " = " << r->width << " x " << r->height << endl;
}

#ifdef GTKOSX
static void
pane_size_watcher (Paned* pane)
{
	/* if the handle of a pane vanishes into (at least) the tabs of a notebook,
	   it is no longer accessible. so stop that. this doesn't happen on X11,
	   just the quartz backend.

	   ugh.
	*/

	int max_width_of_lhs = GTK_WIDGET(pane->gobj())->allocation.width - 25;

	gint pos = pane->get_position ();

	if (pos > max_width_of_lhs) {
		pane->set_position (max_width_of_lhs);
	}
}
#endif

Editor::Editor ()
	: _join_object_range_state (JOIN_OBJECT_RANGE_NONE)

	  /* time display buttons */
	, minsec_label (_("Mins:Secs"))
	, bbt_label (_("Bars:Beats"))
	, timecode_label (_("Timecode"))
	, samples_label (_("Samples"))
	, tempo_label (_("Tempo"))
	, meter_label (_("Meter"))
	, mark_label (_("Location Markers"))
	, range_mark_label (_("Range Markers"))
	, transport_mark_label (_("Loop/Punch Ranges"))
	, cd_mark_label (_("CD Markers"))
	, edit_packer (4, 4, true)

	  /* the values here don't matter: layout widgets
	     reset them as needed.
	  */

	, vertical_adjustment (0.0, 0.0, 10.0, 400.0)

	  /* tool bar related */

	, zoom_range_clock (new AudioClock (X_("zoomrange"), false, X_("ZoomRangeClock"), true, false, true))

	, toolbar_selection_clock_table (2,3)

	, automation_mode_button (_("mode"))
	, global_automation_button (_("automation"))

	, _toolbar_viewport (*manage (new Gtk::Adjustment (0, 0, 1e10)), *manage (new Gtk::Adjustment (0, 0, 1e10)))
	, midi_panic_button (_("Panic"))

#ifdef WITH_CMT
	, image_socket_listener(0)
#endif

	  /* nudge */

	, nudge_clock (new AudioClock (X_("nudge"), false, X_("NudgeClock"), true, false, true))
	, meters_running(false)
	, _pending_locate_request (false)
	, _pending_initial_locate (false)
	, _last_cut_copy_source_track (0)

	, _region_selection_change_updates_region_list (true)
{
	constructed = false;

	/* we are a singleton */

	PublicEditor::_instance = this;

	_have_idled = false;

	selection = new Selection (this);
	cut_buffer = new Selection (this);

	clicked_regionview = 0;
	clicked_axisview = 0;
	clicked_routeview = 0;
	clicked_crossfadeview = 0;
	clicked_control_point = 0;
	last_update_frame = 0;
        pre_press_cursor = 0;
	_drags = new DragManager (this);
	current_mixer_strip = 0;
	current_bbt_points = 0;
	tempo_lines = 0;

	snap_type_strings =  I18N (_snap_type_strings);
	snap_mode_strings =  I18N (_snap_mode_strings);
	zoom_focus_strings = I18N (_zoom_focus_strings);
	edit_point_strings = I18N (_edit_point_strings);
#ifdef USE_RUBBERBAND
	rb_opt_strings = I18N (_rb_opt_strings);
	rb_current_opt = 4;
#endif

	snap_threshold = 5.0;
	bbt_beat_subdivision = 4;
	_canvas_width = 0;
	_canvas_height = 0;
	last_autoscroll_x = 0;
	last_autoscroll_y = 0;
	autoscroll_active = false;
	autoscroll_timeout_tag = -1;
	logo_item = 0;

	analysis_window = 0;

	current_interthread_info = 0;
	_show_measures = true;
	show_gain_after_trim = false;
	last_item_entered = 0;

	have_pending_keyboard_selection = false;
	_follow_playhead = true;
        _stationary_playhead = false;
	_xfade_visibility = true;
	editor_ruler_menu = 0;
	no_ruler_shown_update = false;
	marker_menu = 0;
	range_marker_menu = 0;
	marker_menu_item = 0;
	tempo_or_meter_marker_menu = 0;
	transport_marker_menu = 0;
	new_transport_marker_menu = 0;
	editor_mixer_strip_width = Wide;
	show_editor_mixer_when_tracks_arrive = false;
	region_edit_menu_split_multichannel_item = 0;
	region_edit_menu_split_item = 0;
	temp_location = 0;
	leftmost_frame = 0;
	current_stepping_trackview = 0;
	entered_track = 0;
	entered_regionview = 0;
	entered_marker = 0;
	clear_entered_track = false;
	current_timefx = 0;
	playhead_cursor = 0;
	button_release_can_deselect = true;
	_dragging_playhead = false;
	_dragging_edit_point = false;
	select_new_marker = false;
	rhythm_ferret = 0;
	layering_order_editor = 0;
	no_save_visual = false;
	resize_idle_id = -1;

	scrubbing_direction = 0;

	sfbrowser = 0;

	location_marker_color = ARDOUR_UI::config()->canvasvar_LocationMarker.get();
	location_range_color = ARDOUR_UI::config()->canvasvar_LocationRange.get();
	location_cd_marker_color = ARDOUR_UI::config()->canvasvar_LocationCDMarker.get();
	location_loop_color = ARDOUR_UI::config()->canvasvar_LocationLoop.get();
	location_punch_color = ARDOUR_UI::config()->canvasvar_LocationPunch.get();

	_edit_point = EditAtMouse;
	_internal_editing = false;
	current_canvas_cursor = 0;

	frames_per_unit = 2048; /* too early to use reset_zoom () */

	_scroll_callbacks = 0;

	zoom_focus = ZoomFocusLeft;
	set_zoom_focus (ZoomFocusLeft);
	zoom_range_clock->ValueChanged.connect (sigc::mem_fun(*this, &Editor::zoom_adjustment_changed));

	bbt_label.set_name ("EditorTimeButton");
	bbt_label.set_size_request (-1, (int)timebar_height);
	bbt_label.set_alignment (1.0, 0.5);
	bbt_label.set_padding (5,0);
	bbt_label.hide ();
	bbt_label.set_no_show_all();
	minsec_label.set_name ("EditorTimeButton");
	minsec_label.set_size_request (-1, (int)timebar_height);
	minsec_label.set_alignment (1.0, 0.5);
	minsec_label.set_padding (5,0);
	minsec_label.hide ();
	minsec_label.set_no_show_all();
	timecode_label.set_name ("EditorTimeButton");
	timecode_label.set_size_request (-1, (int)timebar_height);
	timecode_label.set_alignment (1.0, 0.5);
	timecode_label.set_padding (5,0);
	timecode_label.hide ();
	timecode_label.set_no_show_all();
	samples_label.set_name ("EditorTimeButton");
	samples_label.set_size_request (-1, (int)timebar_height);
	samples_label.set_alignment (1.0, 0.5);
	samples_label.set_padding (5,0);
	samples_label.hide ();
	samples_label.set_no_show_all();

	tempo_label.set_name ("EditorTimeButton");
	tempo_label.set_size_request (-1, (int)timebar_height);
	tempo_label.set_alignment (1.0, 0.5);
	tempo_label.set_padding (5,0);
	tempo_label.hide();
	tempo_label.set_no_show_all();

	meter_label.set_name ("EditorTimeButton");
	meter_label.set_size_request (-1, (int)timebar_height);
	meter_label.set_alignment (1.0, 0.5);
	meter_label.set_padding (5,0);
	meter_label.hide();
	meter_label.set_no_show_all();

	mark_label.set_name ("EditorTimeButton");
	mark_label.set_size_request (-1, (int)timebar_height);
	mark_label.set_alignment (1.0, 0.5);
	mark_label.set_padding (5,0);
	mark_label.hide();
	mark_label.set_no_show_all();

	cd_mark_label.set_name ("EditorTimeButton");
	cd_mark_label.set_size_request (-1, (int)timebar_height);
	cd_mark_label.set_alignment (1.0, 0.5);
	cd_mark_label.set_padding (5,0);
	cd_mark_label.hide();
	cd_mark_label.set_no_show_all();

	range_mark_label.set_name ("EditorTimeButton");
	range_mark_label.set_size_request (-1, (int)timebar_height);
	range_mark_label.set_alignment (1.0, 0.5);
	range_mark_label.set_padding (5,0);
	range_mark_label.hide();
	range_mark_label.set_no_show_all();

	transport_mark_label.set_name ("EditorTimeButton");
	transport_mark_label.set_size_request (-1, (int)timebar_height);
	transport_mark_label.set_alignment (1.0, 0.5);
	transport_mark_label.set_padding (5,0);
	transport_mark_label.hide();
	transport_mark_label.set_no_show_all();

	initialize_rulers ();
	initialize_canvas ();

	_summary = new EditorSummary (this);

	selection->TimeChanged.connect (sigc::mem_fun(*this, &Editor::time_selection_changed));
	selection->TracksChanged.connect (sigc::mem_fun(*this, &Editor::track_selection_changed));

	editor_regions_selection_changed_connection = selection->RegionsChanged.connect (sigc::mem_fun(*this, &Editor::region_selection_changed));

	selection->PointsChanged.connect (sigc::mem_fun(*this, &Editor::point_selection_changed));
	selection->MarkersChanged.connect (sigc::mem_fun(*this, &Editor::marker_selection_changed));

	edit_controls_vbox.set_spacing (0);
	vertical_adjustment.signal_value_changed().connect (sigc::mem_fun(*this, &Editor::tie_vertical_scrolling), true);
	track_canvas->signal_map_event().connect (sigc::mem_fun (*this, &Editor::track_canvas_map_handler));

	HBox* h = manage (new HBox);
	_group_tabs = new EditorGroupTabs (this);
	h->pack_start (*_group_tabs, PACK_SHRINK);
	h->pack_start (edit_controls_vbox);
	controls_layout.add (*h);

	controls_layout.set_name ("EditControlsBase");
	controls_layout.add_events (Gdk::SCROLL_MASK);
	controls_layout.signal_scroll_event().connect (sigc::mem_fun(*this, &Editor::control_layout_scroll), false);

	controls_layout.add_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|Gdk::ENTER_NOTIFY_MASK|Gdk::LEAVE_NOTIFY_MASK);
	controls_layout.signal_button_release_event().connect (sigc::mem_fun(*this, &Editor::edit_controls_button_release));

	_cursors = new MouseCursors;

	ArdourCanvas::Canvas* time_pad = manage(new ArdourCanvas::Canvas());
	ArdourCanvas::SimpleLine* pad_line_1 = manage(new ArdourCanvas::SimpleLine(*time_pad->root(),
			0.0, 1.0, 100.0, 1.0));

	pad_line_1->property_color_rgba() = 0xFF0000FF;
	pad_line_1->show();

	time_pad->show();

	time_canvas_vbox.set_size_request (-1, (int)(timebar_height * visible_timebars) + 2);
	time_canvas_vbox.set_size_request (-1, -1);

	ruler_label_event_box.add (ruler_label_vbox);
	ruler_label_event_box.set_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK);
	ruler_label_event_box.signal_button_release_event().connect (sigc::mem_fun(*this, &Editor::ruler_label_button_release));

	time_button_event_box.add (time_button_vbox);
	time_button_event_box.set_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK);
	time_button_event_box.signal_button_release_event().connect (sigc::mem_fun(*this, &Editor::ruler_label_button_release));

	/* these enable us to have a dedicated window (for cursor setting, etc.)
	   for the canvas areas.
	*/

	track_canvas_event_box.add (*track_canvas);

	time_canvas_event_box.add (time_canvas_vbox);
	time_canvas_event_box.set_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|Gdk::POINTER_MOTION_MASK);

	edit_packer.set_col_spacings (0);
	edit_packer.set_row_spacings (0);
	edit_packer.set_homogeneous (false);
	edit_packer.set_border_width (0);
	edit_packer.set_name ("EditorWindow");

	/* labels for the rulers */
	edit_packer.attach (ruler_label_event_box,   1, 2, 0, 1,    FILL,        SHRINK, 0, 0);
	/* labels for the marker "tracks" */
	edit_packer.attach (time_button_event_box,   1, 2, 1, 2,    FILL,        SHRINK, 0, 0);
	/* the rulers */
	edit_packer.attach (time_canvas_event_box,   2, 3, 0, 1,    FILL|EXPAND, FILL, 0, 0);
	/* track controls */
	edit_packer.attach (controls_layout,         0, 2, 2, 3,    FILL,        FILL|EXPAND, 0, 0);
	/* main canvas */
	edit_packer.attach (track_canvas_event_box,  2, 3, 1, 3,    FILL|EXPAND, FILL|EXPAND, 0, 0);

	bottom_hbox.set_border_width (2);
	bottom_hbox.set_spacing (3);

	_route_groups = new EditorRouteGroups (this);
	_routes = new EditorRoutes (this);
	_regions = new EditorRegions (this);
	_snapshots = new EditorSnapshots (this);
	_locations = new EditorLocations (this);

	add_notebook_page (_("Regions"), _regions->widget ());
	add_notebook_page (_("Tracks & Busses"), _routes->widget ());
	add_notebook_page (_("Snapshots"), _snapshots->widget ());
	add_notebook_page (_("Route Groups"), _route_groups->widget ());
	add_notebook_page (_("Ranges & Marks"), _locations->widget ());

	_the_notebook.set_show_tabs (true);
	_the_notebook.set_scrollable (true);
	_the_notebook.popup_disable ();
	_the_notebook.set_tab_pos (Gtk::POS_RIGHT);
	_the_notebook.show_all ();

	post_maximal_editor_width = 0;
	post_maximal_horizontal_pane_position = 0;
	post_maximal_editor_height = 0;
	post_maximal_vertical_pane_position = 0;
	_notebook_shrunk = false;

	editor_summary_pane.pack1(edit_packer);

	Button* summary_arrows_left_left = manage (new Button);
	summary_arrows_left_left->add (*manage (new Arrow (ARROW_LEFT, SHADOW_NONE)));
	summary_arrows_left_left->signal_pressed().connect (sigc::hide_return (sigc::bind (sigc::mem_fun (*this, &Editor::scroll_press), LEFT)));
	summary_arrows_left_left->signal_released().connect (sigc::mem_fun (*this, &Editor::scroll_release));

	Button* summary_arrows_left_right = manage (new Button);
	summary_arrows_left_right->add (*manage (new Arrow (ARROW_RIGHT, SHADOW_NONE)));
	summary_arrows_left_right->signal_pressed().connect (sigc::hide_return (sigc::bind (sigc::mem_fun (*this, &Editor::scroll_press), RIGHT)));
	summary_arrows_left_right->signal_released().connect (sigc::mem_fun (*this, &Editor::scroll_release));

	VBox* summary_arrows_left = manage (new VBox);
	summary_arrows_left->pack_start (*summary_arrows_left_left);
	summary_arrows_left->pack_start (*summary_arrows_left_right);

	Button* summary_arrows_right_up = manage (new Button);
	summary_arrows_right_up->add (*manage (new Arrow (ARROW_UP, SHADOW_NONE)));
	summary_arrows_right_up->signal_pressed().connect (sigc::hide_return (sigc::bind (sigc::mem_fun (*this, &Editor::scroll_press), UP)));
	summary_arrows_right_up->signal_released().connect (sigc::mem_fun (*this, &Editor::scroll_release));

	Button* summary_arrows_right_down = manage (new Button);
	summary_arrows_right_down->add (*manage (new Arrow (ARROW_DOWN, SHADOW_NONE)));
	summary_arrows_right_down->signal_pressed().connect (sigc::hide_return (sigc::bind (sigc::mem_fun (*this, &Editor::scroll_press), DOWN)));
	summary_arrows_right_down->signal_released().connect (sigc::mem_fun (*this, &Editor::scroll_release));

	VBox* summary_arrows_right = manage (new VBox);
	summary_arrows_right->pack_start (*summary_arrows_right_up);
	summary_arrows_right->pack_start (*summary_arrows_right_down);

	Frame* summary_frame = manage (new Frame);
	summary_frame->set_shadow_type (Gtk::SHADOW_ETCHED_IN);

	summary_frame->add (*_summary);
	summary_frame->show ();

	_summary_hbox.pack_start (*summary_arrows_left, false, false);
	_summary_hbox.pack_start (*summary_frame, true, true);
	_summary_hbox.pack_start (*summary_arrows_right, false, false);

	editor_summary_pane.pack2 (_summary_hbox);

	edit_pane.pack1 (editor_summary_pane, true, true);
	edit_pane.pack2 (_the_notebook, false, true);

	editor_summary_pane.signal_size_allocate().connect (sigc::bind (sigc::mem_fun (*this, &Editor::pane_allocation_handler), static_cast<Paned*> (&editor_summary_pane)));

	/* XXX: editor_summary_pane might need similar special OS X treatment to the edit_pane */

	edit_pane.signal_size_allocate().connect (sigc::bind (sigc::mem_fun(*this, &Editor::pane_allocation_handler), static_cast<Paned*> (&edit_pane)));
#ifdef GTKOSX
	Glib::PropertyProxy<int> proxy = edit_pane.property_position();
	proxy.signal_changed().connect (bind (sigc::ptr_fun (pane_size_watcher), static_cast<Paned*> (&edit_pane)));
#endif
	top_hbox.pack_start (toolbar_frame);

	HBox *hbox = manage (new HBox);
	hbox->pack_start (edit_pane, true, true);

	global_vpacker.pack_start (top_hbox, false, false);
	global_vpacker.pack_start (*hbox, true, true);

	global_hpacker.pack_start (global_vpacker, true, true);

	set_name ("EditorWindow");
	add_accel_group (ActionManager::ui_manager->get_accel_group());

	status_bar_hpacker.show ();

	vpacker.pack_end (status_bar_hpacker, false, false);
	vpacker.pack_end (global_hpacker, true, true);

	/* register actions now so that set_state() can find them and set toggles/checks etc */

	register_actions ();

	setup_toolbar ();
	setup_midi_toolbar ();

	_snap_type = SnapToBeat;
	set_snap_to (_snap_type);
	_snap_mode = SnapOff;
	set_snap_mode (_snap_mode);
	set_mouse_mode (MouseObject, true);
        pre_internal_mouse_mode = MouseObject;
	set_edit_point_preference (EditAtMouse, true);

	_playlist_selector = new PlaylistSelector();
	_playlist_selector->signal_delete_event().connect (sigc::bind (sigc::ptr_fun (just_hide_it), static_cast<Window *> (_playlist_selector)));

	RegionView::RegionViewGoingAway.connect (*this, invalidator (*this),  ui_bind (&Editor::catch_vanishing_regionview, this, _1), gui_context());

	/* nudge stuff */

	nudge_forward_button.add (*(manage (new Image (::get_icon("nudge_right")))));
	nudge_backward_button.add (*(manage (new Image (::get_icon("nudge_left")))));

	nudge_forward_button.set_name ("TransportButton");
	nudge_backward_button.set_name ("TransportButton");

	fade_context_menu.set_name ("ArdourContextMenu");

	/* icons, titles, WM stuff */

	list<Glib::RefPtr<Gdk::Pixbuf> > window_icons;
	Glib::RefPtr<Gdk::Pixbuf> icon;

	if ((icon = ::get_icon ("ardour_icon_16px")) != 0) {
		window_icons.push_back (icon);
	}
	if ((icon = ::get_icon ("ardour_icon_22px")) != 0) {
		window_icons.push_back (icon);
	}
	if ((icon = ::get_icon ("ardour_icon_32px")) != 0) {
		window_icons.push_back (icon);
	}
	if ((icon = ::get_icon ("ardour_icon_48px")) != 0) {
		window_icons.push_back (icon);
	}
	if (!window_icons.empty()) {
		// set_icon_list (window_icons);
		set_default_icon_list (window_icons);
	}

	WindowTitle title(Glib::get_application_name());
	title += _("Editor");
	set_title (title.get_string());
	set_wmclass (X_("ardour_editor"), PROGRAM_NAME);

	add (vpacker);
	add_events (Gdk::KEY_PRESS_MASK|Gdk::KEY_RELEASE_MASK);

	signal_configure_event().connect (sigc::mem_fun (*ARDOUR_UI::instance(), &ARDOUR_UI::configure_handler));
	signal_delete_event().connect (sigc::mem_fun (*ARDOUR_UI::instance(), &ARDOUR_UI::exit_on_main_window_close));

	/* allow external control surfaces/protocols to do various things */

	ControlProtocol::ZoomToSession.connect (*this, invalidator (*this), boost::bind (&Editor::temporal_zoom_session, this), gui_context());
	ControlProtocol::ZoomIn.connect (*this, invalidator (*this), boost::bind (&Editor::temporal_zoom_step, this, false), gui_context());
	ControlProtocol::ZoomOut.connect (*this, invalidator (*this), boost::bind (&Editor::temporal_zoom_step, this, true), gui_context());
	ControlProtocol::ScrollTimeline.connect (*this, invalidator (*this), ui_bind (&Editor::control_scroll, this, _1), gui_context());
	ControlProtocol::SelectByRID.connect (*this, invalidator (*this), ui_bind (&Editor::control_select, this, _1), gui_context());
	BasicUI::AccessAction.connect (*this, invalidator (*this), ui_bind (&Editor::access_action, this, _1, _2), gui_context());

	/* problematic: has to return a value and thus cannot be x-thread */

	Session::AskAboutPlaylistDeletion.connect_same_thread (*this, boost::bind (&Editor::playlist_deletion_dialog, this, _1));

	Config->ParameterChanged.connect (*this, invalidator (*this), ui_bind (&Editor::parameter_changed, this, _1), gui_context());

	TimeAxisView::CatchDeletion.connect (*this, invalidator (*this), ui_bind (&Editor::timeaxisview_deleted, this, _1), gui_context());

	_ignore_region_action = false;
	_last_region_menu_was_main = false;
	_popup_region_menu_item = 0;

	_show_marker_lines = false;
	_over_region_trim_target = false;

        /* Button bindings */

        button_bindings = new Bindings;

	XMLNode* node = button_settings();
        if (node) {
                for (XMLNodeList::const_iterator i = node->children().begin(); i != node->children().end(); ++i) {
                        button_bindings->load (**i);
                }
        }

	constructed = true;
	instant_save ();

	setup_fade_images ();
}

Editor::~Editor()
{
#ifdef WITH_CMT
	if(image_socket_listener) {
		if(image_socket_listener->is_connected())
		{
			image_socket_listener->close_connection() ;
		}

		delete image_socket_listener ;
		image_socket_listener = 0 ;
	}
#endif

        delete button_bindings;
	delete _routes;
	delete _route_groups;
	delete track_canvas;
	delete _drags;
}

XMLNode*
Editor::button_settings () const
{
	XMLNode* settings = ARDOUR_UI::instance()->editor_settings();
	XMLNode* node = find_named_node (*settings, X_("Buttons"));

	if (!node) {
                cerr << "new empty Button node\n";
		node = new XMLNode (X_("Buttons"));
	}

	return node;
}

void
Editor::add_toplevel_controls (Container& cont)
{
	vpacker.pack_start (cont, false, false);
	cont.show_all ();
}

void
Editor::catch_vanishing_regionview (RegionView *rv)
{
	/* note: the selection will take care of the vanishing
	   audioregionview by itself.
	*/

	if (_drags->active() && _drags->have_item (rv->get_canvas_group()) && !_drags->ending()) {
		_drags->abort ();
	}

	if (clicked_regionview == rv) {
		clicked_regionview = 0;
	}

	if (entered_regionview == rv) {
		set_entered_regionview (0);
	}

	if (!_all_region_actions_sensitized) {
		sensitize_all_region_actions (true);
	}

	_over_region_trim_target = false;
}

void
Editor::set_entered_regionview (RegionView* rv)
{
	if (rv == entered_regionview) {
		return;
	}

	if (entered_regionview) {
		entered_regionview->exited ();
	}

	if ((entered_regionview = rv) != 0) {
		entered_regionview->entered (internal_editing ());
	}

	if (!_all_region_actions_sensitized && _last_region_menu_was_main) {
		/* This RegionView entry might have changed what region actions
		   are allowed, so sensitize them all in case a key is pressed.
		*/
		sensitize_all_region_actions (true);
	}
}

void
Editor::set_entered_track (TimeAxisView* tav)
{
	if (entered_track) {
		entered_track->exited ();
	}

	if ((entered_track = tav) != 0) {
		entered_track->entered ();
	}
}

void
Editor::show_window ()
{
	if (!is_visible ()) {
		show_all ();

		/* XXX: this is a bit unfortunate; it would probably
		   be nicer if we could just call show () above rather
		   than needing the show_all ()
		*/

		/* re-hide stuff if necessary */
		editor_list_button_toggled ();
		parameter_changed ("show-summary");
		parameter_changed ("show-group-tabs");
		parameter_changed ("show-zoom-tools");

		/* now reset all audio_time_axis heights, because widgets might need
		   to be re-hidden
		*/

		TimeAxisView *tv;

		for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
			tv = (static_cast<TimeAxisView*>(*i));
			tv->reset_height ();
		}

		if (current_mixer_strip) {
			current_mixer_strip->hide_things ();
		}
	}

	present ();
}

void
Editor::instant_save ()
{
	if (!constructed || !ARDOUR_UI::instance()->session_loaded) {
		return;
	}

	if (_session) {
		_session->add_instant_xml(get_state());
	} else {
		Config->add_instant_xml(get_state());
	}
}

void
Editor::zoom_adjustment_changed ()
{
	if (_session == 0) {
		return;
	}

	double fpu = zoom_range_clock->current_duration() / _canvas_width;

	if (fpu < 1.0) {
		fpu = 1.0;
		zoom_range_clock->set ((framepos_t) floor (fpu * _canvas_width));
	} else if (fpu > _session->current_end_frame() / _canvas_width) {
		fpu = _session->current_end_frame() / _canvas_width;
		zoom_range_clock->set ((framepos_t) floor (fpu * _canvas_width));
	}

	temporal_zoom (fpu);
}

void
Editor::control_select (uint32_t rid) 
{
	/* handles the (static) signal from the ControlProtocol class that
	 * requests setting the selected track to a given RID
	 */
	 
	if (!_session) {
		return;
	}

	boost::shared_ptr<Route> r = _session->route_by_remote_id (rid);

	if (!r) {
		return;
	}

	TimeAxisView* tav = axis_view_from_route (r);

	if (tav) {
		selection->set (tav);
	} else {
		selection->clear_tracks ();
	}
}

void
Editor::control_scroll (float fraction)
{
	ENSURE_GUI_THREAD (*this, &Editor::control_scroll, fraction)

	if (!_session) {
		return;
	}

	double step = fraction * current_page_frames();

	/*
		_control_scroll_target is an optional<T>

		it acts like a pointer to an framepos_t, with
		a operator conversion to boolean to check
		that it has a value could possibly use
		playhead_cursor->current_frame to store the
		value and a boolean in the class to know
		when it's out of date
	*/

	if (!_control_scroll_target) {
		_control_scroll_target = _session->transport_frame();
		_dragging_playhead = true;
	}

	if ((fraction < 0.0f) && (*_control_scroll_target < (framepos_t) fabs(step))) {
		*_control_scroll_target = 0;
	} else if ((fraction > 0.0f) && (max_framepos - *_control_scroll_target < step)) {
		*_control_scroll_target = max_framepos - (current_page_frames()*2); // allow room for slop in where the PH is on the screen
	} else {
		*_control_scroll_target += (framepos_t) floor (step);
	}

	/* move visuals, we'll catch up with it later */

	playhead_cursor->set_position (*_control_scroll_target);
	UpdateAllTransportClocks (*_control_scroll_target);

	if (*_control_scroll_target > (current_page_frames() / 2)) {
		/* try to center PH in window */
		reset_x_origin (*_control_scroll_target - (current_page_frames()/2));
	} else {
		reset_x_origin (0);
	}

	/*
		Now we do a timeout to actually bring the session to the right place
		according to the playhead. This is to avoid reading disk buffers on every
		call to control_scroll, which is driven by ScrollTimeline and therefore
		probably by a control surface wheel which can generate lots of events.
	*/
	/* cancel the existing timeout */

	control_scroll_connection.disconnect ();

	/* add the next timeout */

	control_scroll_connection = Glib::signal_timeout().connect (sigc::bind (sigc::mem_fun (*this, &Editor::deferred_control_scroll), *_control_scroll_target), 250);
}

bool
Editor::deferred_control_scroll (framepos_t /*target*/)
{
	_session->request_locate (*_control_scroll_target, _session->transport_rolling());
	// reset for next stream
	_control_scroll_target = boost::none;
	_dragging_playhead = false;
	return false;
}

void
Editor::access_action (std::string action_group, std::string action_item)
{
	if (!_session) {
		return;
	}

	ENSURE_GUI_THREAD (*this, &Editor::access_action, action_group, action_item)

	RefPtr<Action> act;
	act = ActionManager::get_action( action_group.c_str(), action_item.c_str() );

	if (act) {
		act->activate();
	}
}

void
Editor::on_realize ()
{
	Window::on_realize ();
	Realized ();
}

void
Editor::map_position_change (framepos_t frame)
{
	ENSURE_GUI_THREAD (*this, &Editor::map_position_change, frame)

	if (_session == 0) {
		return;
	}

	if (_follow_playhead) {
		center_screen (frame);
	}

	playhead_cursor->set_position (frame);
}

void
Editor::center_screen (framepos_t frame)
{
	double page = _canvas_width * frames_per_unit;

	/* if we're off the page, then scroll.
	 */

	if (frame < leftmost_frame || frame >= leftmost_frame + page) {
		center_screen_internal (frame, page);
	}
}

void
Editor::center_screen_internal (framepos_t frame, float page)
{
	page /= 2;

	if (frame > page) {
		frame -= (framepos_t) page;
	} else {
		frame = 0;
	}

	reset_x_origin (frame);
}


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

	if (_session) {
		bool dirty = _session->dirty();

		string session_name;

		if (_session->snap_name() != _session->name()) {
			session_name = _session->snap_name();
		} else {
			session_name = _session->name();
		}

		if (dirty) {
			session_name = "*" + session_name;
		}

		WindowTitle title(session_name);
		title += Glib::get_application_name();
		set_title (title.get_string());
	}
}

void
Editor::set_session (Session *t)
{
	SessionHandlePtr::set_session (t);

	if (!_session) {
		return;
	}

	zoom_range_clock->set_session (_session);
	_playlist_selector->set_session (_session);
	nudge_clock->set_session (_session);
	_summary->set_session (_session);
	_group_tabs->set_session (_session);
	_route_groups->set_session (_session);
	_regions->set_session (_session);
	_snapshots->set_session (_session);
	_routes->set_session (_session);
	_locations->set_session (_session);

	if (rhythm_ferret) {
		rhythm_ferret->set_session (_session);
	}

	if (analysis_window) {
		analysis_window->set_session (_session);
	}

	if (sfbrowser) {
		sfbrowser->set_session (_session);
	}

	compute_fixed_ruler_scale ();

	XMLNode* node = ARDOUR_UI::instance()->editor_settings();
	set_state (*node, Stateful::loading_state_version);

	/* catch up with the playhead */

	_session->request_locate (playhead_cursor->current_frame);
	_pending_initial_locate = true;

	update_title ();

	/* These signals can all be emitted by a non-GUI thread. Therefore the
	   handlers for them must not attempt to directly interact with the GUI,
	   but use Gtkmm2ext::UI::instance()->call_slot();
	*/

	_session->StepEditStatusChange.connect (_session_connections, invalidator (*this), ui_bind(&Editor::step_edit_status_change, this, _1), gui_context());
	_session->TransportStateChange.connect (_session_connections, invalidator (*this), boost::bind (&Editor::map_transport_state, this), gui_context());
	_session->PositionChanged.connect (_session_connections, invalidator (*this), ui_bind (&Editor::map_position_change, this, _1), gui_context());
	_session->RouteAdded.connect (_session_connections, invalidator (*this), ui_bind (&Editor::handle_new_route, this, _1), gui_context());
	_session->DirtyChanged.connect (_session_connections, invalidator (*this), boost::bind (&Editor::update_title, this), gui_context());
	_session->tempo_map().PropertyChanged.connect (_session_connections, invalidator (*this), ui_bind (&Editor::tempo_map_changed, this, _1), gui_context());
	_session->Located.connect (_session_connections, invalidator (*this), boost::bind (&Editor::located, this), gui_context());
	_session->config.ParameterChanged.connect (_session_connections, invalidator (*this), ui_bind (&Editor::parameter_changed, this, _1), gui_context());
	_session->StateSaved.connect (_session_connections, invalidator (*this), ui_bind (&Editor::session_state_saved, this, _1), gui_context());
	_session->locations()->added.connect (_session_connections, invalidator (*this), ui_bind (&Editor::add_new_location, this, _1), gui_context());
	_session->locations()->removed.connect (_session_connections, invalidator (*this), ui_bind (&Editor::location_gone, this, _1), gui_context());
	_session->locations()->changed.connect (_session_connections, invalidator (*this), boost::bind (&Editor::refresh_location_display, this), gui_context());
	_session->locations()->StateChanged.connect (_session_connections, invalidator (*this), ui_bind (&Editor::refresh_location_display, this), gui_context());
	_session->history().Changed.connect (_session_connections, invalidator (*this), boost::bind (&Editor::history_changed, this), gui_context());

	if (Profile->get_sae()) {
		Timecode::BBT_Time bbt;
		bbt.bars = 0;
		bbt.beats = 0;
		bbt.ticks = 120;
		framepos_t pos = _session->tempo_map().bbt_duration_at (0, bbt, 1);
		nudge_clock->set_mode(AudioClock::BBT);
		nudge_clock->set (pos, true, 0, AudioClock::BBT);

	} else {
		nudge_clock->set (_session->frame_rate() * 5, true, 0, AudioClock::Timecode); // default of 5 seconds
	}

	playhead_cursor->canvas_item.show ();

	Location* loc = _session->locations()->auto_loop_location();
	if (loc == 0) {
		loc = new Location (*_session, 0, _session->current_end_frame(), _("Loop"),(Location::Flags) (Location::IsAutoLoop | Location::IsHidden));

		if (loc->start() == loc->end()) {
			loc->set_end (loc->start() + 1);
		}

		_session->locations()->add (loc, false);
		_session->set_auto_loop_location (loc);
	} else {
		// force name
		loc->set_name (_("Loop"));
	}

	loc = _session->locations()->auto_punch_location();

	if (loc == 0) {
		loc = new Location (*_session, 0, _session->current_end_frame(), _("Punch"), (Location::Flags) (Location::IsAutoPunch | Location::IsHidden));

		if (loc->start() == loc->end()) {
			loc->set_end (loc->start() + 1);
		}

		_session->locations()->add (loc, false);
		_session->set_auto_punch_location (loc);
	} else {
		// force name
		loc->set_name (_("Punch"));
	}

	boost::function<void (string)> pc (boost::bind (&Editor::parameter_changed, this, _1));
	Config->map_parameters (pc);
	_session->config.map_parameters (pc);

	refresh_location_display ();

	restore_ruler_visibility ();
	//tempo_map_changed (PropertyChange (0));
	_session->tempo_map().apply_with_metrics (*this, &Editor::draw_metric_marks);

	for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
		(static_cast<TimeAxisView*>(*i))->set_samples_per_unit (frames_per_unit);
	}

	super_rapid_screen_update_connection = ARDOUR_UI::instance()->SuperRapidScreenUpdate.connect (
		sigc::mem_fun (*this, &Editor::super_rapid_screen_update)
		);

	switch (_snap_type) {
	case SnapToRegionStart:
	case SnapToRegionEnd:
	case SnapToRegionSync:
	case SnapToRegionBoundary:
		build_region_boundary_cache ();
		break;

	default:
		break;
	}

	/* register for undo history */
	_session->register_with_memento_command_factory(_id, this);

	ActionManager::ui_manager->signal_pre_activate().connect (sigc::mem_fun (*this, &Editor::action_pre_activated));

	start_updating_meters ();
}

void
Editor::action_pre_activated (Glib::RefPtr<Action> const & a)
{
	if (a->get_name() == "RegionMenu") {
		/* When the main menu's region menu is opened, we setup the actions so that they look right
		   in the menu.  I can't find a way of getting a signal when this menu is subsequently closed,
		   so we resensitize all region actions when the entered regionview or the region selection
		   changes.  HOWEVER we can't always resensitize on entered_regionview change because that
		   happens after the region context menu is opened.  So we set a flag here, too.

		   What a carry on :(
		*/
		sensitize_the_right_region_actions ();
		_last_region_menu_was_main = true;
	}
}

/** Pop up a context menu for when the user clicks on a fade in or fade out */
void
Editor::popup_fade_context_menu (int button, int32_t time, ArdourCanvas::Item* item, ItemType item_type)
{
	using namespace Menu_Helpers;
	AudioRegionView* arv = static_cast<AudioRegionView*> (item->get_data ("regionview"));

	if (arv == 0) {
		fatal << _("programming error: fade in canvas item has no regionview data pointer!") << endmsg;
		/*NOTREACHED*/
	}

	MenuList& items (fade_context_menu.items());

	items.clear ();

	switch (item_type) {
	case FadeInItem:
	case FadeInHandleItem:
		if (arv->audio_region()->fade_in_active()) {
			items.push_back (MenuElem (_("Deactivate"), sigc::bind (sigc::mem_fun (*this, &Editor::set_fade_in_active), false)));
		} else {
			items.push_back (MenuElem (_("Activate"), sigc::bind (sigc::mem_fun (*this, &Editor::set_fade_in_active), true)));
		}

		items.push_back (SeparatorElem());

		if (Profile->get_sae()) {

			items.push_back (MenuElem (_("Linear"), sigc::bind (sigc::mem_fun (*this, &Editor::set_fade_in_shape), FadeLinear)));
			items.push_back (MenuElem (_("Slowest"), sigc::bind (sigc::mem_fun (*this, &Editor::set_fade_in_shape), FadeFast)));

		} else {

			items.push_back (
				ImageMenuElem (
					_("Linear"),
					*_fade_in_images[FadeLinear],
					sigc::bind (sigc::mem_fun (*this, &Editor::set_fade_in_shape), FadeLinear)
					)
				);

			dynamic_cast<ImageMenuItem*>(&items.back())->set_always_show_image ();

			items.push_back (
				ImageMenuElem (
					_("Slowest"),
					*_fade_in_images[FadeFast],
					sigc::bind (sigc::mem_fun (*this, &Editor::set_fade_in_shape), FadeFast)
					));

			dynamic_cast<ImageMenuItem*>(&items.back())->set_always_show_image ();

			items.push_back (
				ImageMenuElem (
					_("Slow"),
					*_fade_in_images[FadeLogB],
					sigc::bind (sigc::mem_fun (*this, &Editor::set_fade_in_shape), FadeLogB)
					));

			dynamic_cast<ImageMenuItem*>(&items.back())->set_always_show_image ();

			items.push_back (
				ImageMenuElem (
					_("Fast"),
					*_fade_in_images[FadeLogA],
					sigc::bind (sigc::mem_fun (*this, &Editor::set_fade_in_shape), FadeLogA)
					));

			dynamic_cast<ImageMenuItem*>(&items.back())->set_always_show_image ();

			items.push_back (
				ImageMenuElem (
					_("Fastest"),
					*_fade_in_images[FadeSlow],
					sigc::bind (sigc::mem_fun (*this, &Editor::set_fade_in_shape), FadeSlow)
					));

			dynamic_cast<ImageMenuItem*>(&items.back())->set_always_show_image ();
		}

		break;

	case FadeOutItem:
	case FadeOutHandleItem:
		if (arv->audio_region()->fade_out_active()) {
			items.push_back (MenuElem (_("Deactivate"), sigc::bind (sigc::mem_fun (*this, &Editor::set_fade_out_active), false)));
		} else {
			items.push_back (MenuElem (_("Activate"), sigc::bind (sigc::mem_fun (*this, &Editor::set_fade_out_active), true)));
		}

		items.push_back (SeparatorElem());

		if (Profile->get_sae()) {
			items.push_back (MenuElem (_("Linear"), sigc::bind (sigc::mem_fun (*this, &Editor::set_fade_out_shape), FadeLinear)));
			items.push_back (MenuElem (_("Slowest"), sigc::bind (sigc::mem_fun (*this, &Editor::set_fade_out_shape), FadeSlow)));
		} else {

			items.push_back (
				ImageMenuElem (
					_("Linear"),
					*_fade_out_images[FadeLinear],
					sigc::bind (sigc::mem_fun (*this, &Editor::set_fade_out_shape), FadeLinear)
					)
				);

			dynamic_cast<ImageMenuItem*>(&items.back())->set_always_show_image ();

			items.push_back (
				ImageMenuElem (
					_("Slowest"),
					*_fade_out_images[FadeFast],
					sigc::bind (sigc::mem_fun (*this, &Editor::set_fade_out_shape), FadeSlow)
					));

			dynamic_cast<ImageMenuItem*>(&items.back())->set_always_show_image ();

			items.push_back (
				ImageMenuElem (
					_("Slow"),
					*_fade_out_images[FadeLogB],
					sigc::bind (sigc::mem_fun (*this, &Editor::set_fade_out_shape), FadeLogA)
					));

			dynamic_cast<ImageMenuItem*>(&items.back())->set_always_show_image ();

			items.push_back (
				ImageMenuElem (
					_("Fast"),
					*_fade_out_images[FadeLogA],
					sigc::bind (sigc::mem_fun (*this, &Editor::set_fade_out_shape), FadeLogB)
					));

			dynamic_cast<ImageMenuItem*>(&items.back())->set_always_show_image ();

			items.push_back (
				ImageMenuElem (
					_("Fastest"),
					*_fade_out_images[FadeSlow],
					sigc::bind (sigc::mem_fun (*this, &Editor::set_fade_out_shape), FadeFast)
					));

			dynamic_cast<ImageMenuItem*>(&items.back())->set_always_show_image ();
		}

		break;

	default:
		fatal << _("programming error: ")
		      << X_("non-fade canvas item passed to popup_fade_context_menu()")
		      << endmsg;
		/*NOTREACHED*/
	}

	fade_context_menu.popup (button, time);
}

void
Editor::popup_track_context_menu (int button, int32_t time, ItemType item_type, bool with_selection)
{
	using namespace Menu_Helpers;
	Menu* (Editor::*build_menu_function)();
	Menu *menu;

	switch (item_type) {
	case RegionItem:
	case RegionViewName:
	case RegionViewNameHighlight:
	case LeftFrameHandle:
	case RightFrameHandle:
		if (with_selection) {
			build_menu_function = &Editor::build_track_selection_context_menu;
		} else {
			build_menu_function = &Editor::build_track_region_context_menu;
		}
		break;

	case SelectionItem:
		if (with_selection) {
			build_menu_function = &Editor::build_track_selection_context_menu;
		} else {
			build_menu_function = &Editor::build_track_context_menu;
		}
		break;

	case CrossfadeViewItem:
		build_menu_function = &Editor::build_track_crossfade_context_menu;
		break;

	case StreamItem:
		if (clicked_routeview->track()) {
			build_menu_function = &Editor::build_track_context_menu;
		} else {
			build_menu_function = &Editor::build_track_bus_context_menu;
		}
		break;

	default:
		/* probably shouldn't happen but if it does, we don't care */
		return;
	}

	menu = (this->*build_menu_function)();
	menu->set_name ("ArdourContextMenu");

	/* now handle specific situations */

	switch (item_type) {
	case RegionItem:
	case RegionViewName:
	case RegionViewNameHighlight:
	case LeftFrameHandle:
	case RightFrameHandle:
		if (!with_selection) {
			if (region_edit_menu_split_item) {
				if (clicked_regionview && clicked_regionview->region()->covers (get_preferred_edit_position())) {
					ActionManager::set_sensitive (ActionManager::edit_point_in_region_sensitive_actions, true);
				} else {
					ActionManager::set_sensitive (ActionManager::edit_point_in_region_sensitive_actions, false);
				}
			}
			if (region_edit_menu_split_multichannel_item) {
				if (clicked_regionview && clicked_regionview->region()->n_channels() > 1) {
					region_edit_menu_split_multichannel_item->set_sensitive (true);
				} else {
					region_edit_menu_split_multichannel_item->set_sensitive (false);
				}
			}
		}
		break;

	case SelectionItem:
		break;

	case CrossfadeViewItem:
		break;

	case StreamItem:
		break;

	default:
		/* probably shouldn't happen but if it does, we don't care */
		return;
	}

	if (item_type != SelectionItem && clicked_routeview && clicked_routeview->audio_track()) {

		/* Bounce to disk */

		using namespace Menu_Helpers;
		MenuList& edit_items  = menu->items();

		edit_items.push_back (SeparatorElem());

		switch (clicked_routeview->audio_track()->freeze_state()) {
		case AudioTrack::NoFreeze:
			edit_items.push_back (MenuElem (_("Freeze"), sigc::mem_fun(*this, &Editor::freeze_route)));
			break;

		case AudioTrack::Frozen:
			edit_items.push_back (MenuElem (_("Unfreeze"), sigc::mem_fun(*this, &Editor::unfreeze_route)));
			break;

		case AudioTrack::UnFrozen:
			edit_items.push_back (MenuElem (_("Freeze"), sigc::mem_fun(*this, &Editor::freeze_route)));
			break;
		}

	}

	if (item_type == StreamItem && clicked_routeview) {
		clicked_routeview->build_underlay_menu(menu);
	}

	/* When the region menu is opened, we setup the actions so that they look right
	   in the menu.
	*/
	sensitize_the_right_region_actions ();
	_last_region_menu_was_main = false;

	menu->signal_hide().connect (sigc::bind (sigc::mem_fun (*this, &Editor::sensitize_all_region_actions), true));
	menu->popup (button, time);
}

Menu*
Editor::build_track_context_menu ()
{
	using namespace Menu_Helpers;

 	MenuList& edit_items = track_context_menu.items();
	edit_items.clear();

	add_dstream_context_items (edit_items);
	return &track_context_menu;
}

Menu*
Editor::build_track_bus_context_menu ()
{
	using namespace Menu_Helpers;

 	MenuList& edit_items = track_context_menu.items();
	edit_items.clear();

	add_bus_context_items (edit_items);
	return &track_context_menu;
}

Menu*
Editor::build_track_region_context_menu ()
{
	using namespace Menu_Helpers;
	MenuList& edit_items  = track_region_context_menu.items();
	edit_items.clear();

	/* we've just cleared the track region context menu, so the menu that these
	   two items were on will have disappeared; stop them dangling.
	*/
	region_edit_menu_split_item = 0;
	region_edit_menu_split_multichannel_item = 0;

	/* we might try to use items that are currently attached to a crossfade menu,
	   so clear that, too.
	*/
	track_crossfade_context_menu.items().clear ();

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

	if (rtv) {
		boost::shared_ptr<Track> tr;
		boost::shared_ptr<Playlist> pl;

		if ((tr = rtv->track())) {
			add_region_context_items (edit_items, tr);
		}
	}

	add_dstream_context_items (edit_items);

	return &track_region_context_menu;
}

Menu*
Editor::build_track_crossfade_context_menu ()
{
	using namespace Menu_Helpers;
	MenuList& edit_items  = track_crossfade_context_menu.items();
	edit_items.clear ();

	/* we might try to use items that are currently attached to a crossfade menu,
	   so clear that, too.
	*/
	track_region_context_menu.items().clear ();

	AudioTimeAxisView* atv = dynamic_cast<AudioTimeAxisView*> (clicked_axisview);

	if (atv) {
		boost::shared_ptr<Track> tr;
		boost::shared_ptr<Playlist> pl;
		boost::shared_ptr<AudioPlaylist> apl;

		if ((tr = atv->track()) && ((pl = tr->playlist()) != 0) && ((apl = boost::dynamic_pointer_cast<AudioPlaylist> (pl)) != 0)) {

			AudioPlaylist::Crossfades xfades;
			framepos_t where;
			bool ignored;

			/* The xfade menu is a bit of a special case, as we always use the mouse position
			   to decide whether or not to display it (rather than the edit point).  No particularly
			   strong reasons for this, other than it is a bit surprising to right-click on a xfade
			   and not get a menu.
			*/
			mouse_frame (where, ignored);
			apl->crossfades_at (where, xfades);

			bool const many = xfades.size() > 1;

			for (AudioPlaylist::Crossfades::iterator i = xfades.begin(); i != xfades.end(); ++i) {
				add_crossfade_context_items (atv->audio_view(), (*i), edit_items, many);
			}

			add_region_context_items (edit_items, tr);
		}
	}

	add_dstream_context_items (edit_items);

	return &track_crossfade_context_menu;
}

void
Editor::analyze_region_selection ()
{
	if (analysis_window == 0) {
		analysis_window = new AnalysisWindow();

		if (_session != 0)
			analysis_window->set_session(_session);

		analysis_window->show_all();
	}

	analysis_window->set_regionmode();
	analysis_window->analyze();

	analysis_window->present();
}

void
Editor::analyze_range_selection()
{
	if (analysis_window == 0) {
		analysis_window = new AnalysisWindow();

		if (_session != 0)
			analysis_window->set_session(_session);

		analysis_window->show_all();
	}

	analysis_window->set_rangemode();
	analysis_window->analyze();

	analysis_window->present();
}

Menu*
Editor::build_track_selection_context_menu ()
{
	using namespace Menu_Helpers;
	MenuList& edit_items  = track_selection_context_menu.items();
	edit_items.clear ();

	add_selection_context_items (edit_items);
	// edit_items.push_back (SeparatorElem());
	// add_dstream_context_items (edit_items);

	return &track_selection_context_menu;
}

/** Add context menu items relevant to crossfades.
 * @param edit_items List to add the items to.
 */
void
Editor::add_crossfade_context_items (AudioStreamView* /*view*/, boost::shared_ptr<Crossfade> xfade, Menu_Helpers::MenuList& edit_items, bool many)
{
	using namespace Menu_Helpers;
	Menu     *xfade_menu = manage (new Menu);
	MenuList& items       = xfade_menu->items();
	xfade_menu->set_name ("ArdourContextMenu");
	string str;

	if (xfade->active()) {
		str = _("Mute");
	} else {
		str = _("Unmute");
	}

	items.push_back (MenuElem (str, sigc::bind (sigc::mem_fun(*this, &Editor::toggle_xfade_active), boost::weak_ptr<Crossfade> (xfade))));
	items.push_back (MenuElem (_("Edit..."), sigc::bind (sigc::mem_fun(*this, &Editor::edit_xfade), boost::weak_ptr<Crossfade> (xfade))));

	if (xfade->can_follow_overlap()) {

		if (xfade->following_overlap()) {
			str = _("Convert to Short");
		} else {
			str = _("Convert to Full");
		}

		items.push_back (MenuElem (str, sigc::bind (sigc::mem_fun(*this, &Editor::toggle_xfade_length), xfade)));
	}

	if (many) {
		str = xfade->out()->name();
		str += "->";
		str += xfade->in()->name();
	} else {
		str = _("Crossfade");
	}

	edit_items.push_back (MenuElem (str, *xfade_menu));
	edit_items.push_back (SeparatorElem());
}

void
Editor::xfade_edit_left_region ()
{
	if (clicked_crossfadeview) {
		clicked_crossfadeview->left_view.show_region_editor ();
	}
}

void
Editor::xfade_edit_right_region ()
{
	if (clicked_crossfadeview) {
		clicked_crossfadeview->right_view.show_region_editor ();
	}
}

void
Editor::add_region_context_items (Menu_Helpers::MenuList& edit_items, boost::shared_ptr<Track> track)
{
	using namespace Menu_Helpers;

	/* OK, stick the region submenu at the top of the list, and then add
	   the standard items.
	*/

	RegionSelection rs = get_regions_from_selection_and_entered ();

	string::size_type pos = 0;
	string menu_item_name = (rs.size() == 1) ? rs.front()->region()->name() : _("Selected Regions");

	/* we have to hack up the region name because "_" has a special
	   meaning for menu titles.
	*/

	while ((pos = menu_item_name.find ("_", pos)) != string::npos) {
		menu_item_name.replace (pos, 1, "__");
		pos += 2;
	}

	if (_popup_region_menu_item == 0) {
		_popup_region_menu_item = new MenuItem (menu_item_name);
		_popup_region_menu_item->set_submenu (*dynamic_cast<Menu*> (ActionManager::get_widget (X_("/PopupRegionMenu"))));
		_popup_region_menu_item->show ();
	} else {
		_popup_region_menu_item->set_label (menu_item_name);
	}

	/* Use the mouse position rather than the edit point to decide whether to show the `choose top region'
	   dialogue.  If we use the edit point it gets a bit messy because the user still has to click over
	   *some* region in order to get the region context menu stuff to be displayed at all.
	*/

	framepos_t mouse;
	bool ignored;
	mouse_frame (mouse, ignored);

	edit_items.push_back (*_popup_region_menu_item);
	if (track->playlist()->count_regions_at (mouse) > 1 && (layering_order_editor == 0 || !layering_order_editor->is_visible ())) {
		edit_items.push_back (*manage (_region_actions->get_action ("choose-top-region")->create_menu_item ()));
	}
	edit_items.push_back (SeparatorElem());
}

/** Add context menu items relevant to selection ranges.
 * @param edit_items List to add the items to.
 */
void
Editor::add_selection_context_items (Menu_Helpers::MenuList& edit_items)
{
	using namespace Menu_Helpers;

	edit_items.push_back (MenuElem (_("Play Range"), sigc::mem_fun(*this, &Editor::play_selection)));
	edit_items.push_back (MenuElem (_("Loop Range"), sigc::bind (sigc::mem_fun(*this, &Editor::set_loop_from_selection), true)));

	edit_items.push_back (SeparatorElem());
	edit_items.push_back (MenuElem (_("Spectral Analysis"), sigc::mem_fun(*this, &Editor::analyze_range_selection)));

	edit_items.push_back (SeparatorElem());

	edit_items.push_back (
		MenuElem (
			_("Move Range Start to Previous Region Boundary"),
			sigc::bind (sigc::mem_fun (*this, &Editor::move_range_selection_start_or_end_to_region_boundary), false, false)
			)
		);

	edit_items.push_back (
		MenuElem (
			_("Move Range Start to Next Region Boundary"),
			sigc::bind (sigc::mem_fun (*this, &Editor::move_range_selection_start_or_end_to_region_boundary), false, true)
			)
		);

	edit_items.push_back (
		MenuElem (
			_("Move Range End to Previous Region Boundary"),
			sigc::bind (sigc::mem_fun (*this, &Editor::move_range_selection_start_or_end_to_region_boundary), true, false)
			)
		);

	edit_items.push_back (
		MenuElem (
			_("Move Range End to Next Region Boundary"),
			sigc::bind (sigc::mem_fun (*this, &Editor::move_range_selection_start_or_end_to_region_boundary), true, true)
			)
		);

	edit_items.push_back (SeparatorElem());
	edit_items.push_back (MenuElem (_("Convert to Region In-Place"), mem_fun(*this, &Editor::separate_region_from_selection)));
	edit_items.push_back (MenuElem (_("Convert to Region in Region List"), sigc::mem_fun(*this, &Editor::new_region_from_selection)));

	edit_items.push_back (SeparatorElem());
	edit_items.push_back (MenuElem (_("Select All in Range"), sigc::mem_fun(*this, &Editor::select_all_selectables_using_time_selection)));

	edit_items.push_back (SeparatorElem());
	edit_items.push_back (MenuElem (_("Set Loop from Range"), sigc::bind (sigc::mem_fun(*this, &Editor::set_loop_from_selection), false)));
	edit_items.push_back (MenuElem (_("Set Punch from Range"), sigc::mem_fun(*this, &Editor::set_punch_from_selection)));

	edit_items.push_back (SeparatorElem());
	edit_items.push_back (MenuElem (_("Add Range Markers"), sigc::mem_fun (*this, &Editor::add_location_from_selection)));

	edit_items.push_back (SeparatorElem());
	edit_items.push_back (MenuElem (_("Crop Region to Range"), sigc::mem_fun(*this, &Editor::crop_region_to_selection)));
	edit_items.push_back (MenuElem (_("Fill Range with Region"), sigc::mem_fun(*this, &Editor::region_fill_selection)));
	edit_items.push_back (MenuElem (_("Duplicate Range"), sigc::bind (sigc::mem_fun(*this, &Editor::duplicate_dialog), false)));

	edit_items.push_back (SeparatorElem());
	edit_items.push_back (MenuElem (_("Consolidate Range"), sigc::bind (sigc::mem_fun(*this, &Editor::bounce_range_selection), true, false)));
	edit_items.push_back (MenuElem (_("Consolidate Range With Processing"), sigc::bind (sigc::mem_fun(*this, &Editor::bounce_range_selection), true, true)));
	edit_items.push_back (MenuElem (_("Bounce Range to Region List"), sigc::bind (sigc::mem_fun(*this, &Editor::bounce_range_selection), false, false)));
	edit_items.push_back (MenuElem (_("Bounce Range to Region List With Processing"), sigc::bind (sigc::mem_fun(*this, &Editor::bounce_range_selection), false, true)));
	edit_items.push_back (MenuElem (_("Export Range"), sigc::mem_fun(*this, &Editor::export_selection)));
}


void
Editor::add_dstream_context_items (Menu_Helpers::MenuList& edit_items)
{
	using namespace Menu_Helpers;

	/* Playback */

	Menu *play_menu = manage (new Menu);
	MenuList& play_items = play_menu->items();
	play_menu->set_name ("ArdourContextMenu");

	play_items.push_back (MenuElem (_("Play From Edit Point"), sigc::mem_fun(*this, &Editor::play_from_edit_point)));
	play_items.push_back (MenuElem (_("Play From Start"), sigc::mem_fun(*this, &Editor::play_from_start)));
	play_items.push_back (MenuElem (_("Play Region"), sigc::mem_fun(*this, &Editor::play_selected_region)));
	play_items.push_back (SeparatorElem());
	play_items.push_back (MenuElem (_("Loop Region"), sigc::bind (sigc::mem_fun (*this, &Editor::set_loop_from_region), true)));

	edit_items.push_back (MenuElem (_("Play"), *play_menu));

	/* Selection */

	Menu *select_menu = manage (new Menu);
	MenuList& select_items = select_menu->items();
	select_menu->set_name ("ArdourContextMenu");

	select_items.push_back (MenuElem (_("Select All in Track"), sigc::bind (sigc::mem_fun(*this, &Editor::select_all_in_track), Selection::Set)));
	select_items.push_back (MenuElem (_("Select All"), sigc::bind (sigc::mem_fun(*this, &Editor::select_all), Selection::Set)));
	select_items.push_back (MenuElem (_("Invert Selection in Track"), sigc::mem_fun(*this, &Editor::invert_selection_in_track)));
	select_items.push_back (MenuElem (_("Invert Selection"), sigc::mem_fun(*this, &Editor::invert_selection)));
	select_items.push_back (SeparatorElem());
	select_items.push_back (MenuElem (_("Set Range to Loop Range"), sigc::mem_fun(*this, &Editor::set_selection_from_loop)));
	select_items.push_back (MenuElem (_("Set Range to Punch Range"), sigc::mem_fun(*this, &Editor::set_selection_from_punch)));
	select_items.push_back (SeparatorElem());
	select_items.push_back (MenuElem (_("Select All After Edit Point"), sigc::bind (sigc::mem_fun(*this, &Editor::select_all_selectables_using_edit), true)));
	select_items.push_back (MenuElem (_("Select All Before Edit Point"), sigc::bind (sigc::mem_fun(*this, &Editor::select_all_selectables_using_edit), false)));
	select_items.push_back (MenuElem (_("Select All After Playhead"), sigc::bind (sigc::mem_fun(*this, &Editor::select_all_selectables_using_cursor), playhead_cursor, true)));
	select_items.push_back (MenuElem (_("Select All Before Playhead"), sigc::bind (sigc::mem_fun(*this, &Editor::select_all_selectables_using_cursor), playhead_cursor, false)));
	select_items.push_back (MenuElem (_("Select All Between Playhead and Edit Point"), sigc::bind (sigc::mem_fun(*this, &Editor::select_all_selectables_between), false)));
	select_items.push_back (MenuElem (_("Select All Within Playhead and Edit Point"), sigc::bind (sigc::mem_fun(*this, &Editor::select_all_selectables_between), true)));
	select_items.push_back (MenuElem (_("Select Range Between Playhead and Edit Point"), sigc::mem_fun(*this, &Editor::select_range_between)));

	edit_items.push_back (MenuElem (_("Select"), *select_menu));

	/* Cut-n-Paste */

	Menu *cutnpaste_menu = manage (new Menu);
	MenuList& cutnpaste_items = cutnpaste_menu->items();
	cutnpaste_menu->set_name ("ArdourContextMenu");

	cutnpaste_items.push_back (MenuElem (_("Cut"), sigc::mem_fun(*this, &Editor::cut)));
	cutnpaste_items.push_back (MenuElem (_("Copy"), sigc::mem_fun(*this, &Editor::copy)));
	cutnpaste_items.push_back (MenuElem (_("Paste"), sigc::bind (sigc::mem_fun(*this, &Editor::paste), 1.0f)));

	cutnpaste_items.push_back (SeparatorElem());

	cutnpaste_items.push_back (MenuElem (_("Align"), sigc::bind (sigc::mem_fun (*this, &Editor::align_regions), ARDOUR::SyncPoint)));
	cutnpaste_items.push_back (MenuElem (_("Align Relative"), sigc::bind (sigc::mem_fun (*this, &Editor::align_regions_relative), ARDOUR::SyncPoint)));

	edit_items.push_back (MenuElem (_("Edit"), *cutnpaste_menu));

	/* Adding new material */

	edit_items.push_back (SeparatorElem());
	edit_items.push_back (MenuElem (_("Insert Selected Region"), sigc::bind (sigc::mem_fun(*this, &Editor::insert_region_list_selection), 1.0f)));
	edit_items.push_back (MenuElem (_("Insert Existing Media"), sigc::bind (sigc::mem_fun(*this, &Editor::add_external_audio_action), ImportToTrack)));

	/* Nudge track */

	Menu *nudge_menu = manage (new Menu());
	MenuList& nudge_items = nudge_menu->items();
	nudge_menu->set_name ("ArdourContextMenu");

	edit_items.push_back (SeparatorElem());
	nudge_items.push_back (MenuElem (_("Nudge Entire Track Forward"), (sigc::bind (sigc::mem_fun(*this, &Editor::nudge_track), false, true))));
	nudge_items.push_back (MenuElem (_("Nudge Track After Edit Point Forward"), (sigc::bind (sigc::mem_fun(*this, &Editor::nudge_track), true, true))));
	nudge_items.push_back (MenuElem (_("Nudge Entire Track Backward"), (sigc::bind (sigc::mem_fun(*this, &Editor::nudge_track), false, false))));
	nudge_items.push_back (MenuElem (_("Nudge Track After Edit Point Backward"), (sigc::bind (sigc::mem_fun(*this, &Editor::nudge_track), true, false))));

	edit_items.push_back (MenuElem (_("Nudge"), *nudge_menu));
}

void
Editor::add_bus_context_items (Menu_Helpers::MenuList& edit_items)
{
	using namespace Menu_Helpers;

	/* Playback */

	Menu *play_menu = manage (new Menu);
	MenuList& play_items = play_menu->items();
	play_menu->set_name ("ArdourContextMenu");

	play_items.push_back (MenuElem (_("Play From Edit Point"), sigc::mem_fun(*this, &Editor::play_from_edit_point)));
	play_items.push_back (MenuElem (_("Play From Start"), sigc::mem_fun(*this, &Editor::play_from_start)));
	edit_items.push_back (MenuElem (_("Play"), *play_menu));

	/* Selection */

	Menu *select_menu = manage (new Menu);
	MenuList& select_items = select_menu->items();
	select_menu->set_name ("ArdourContextMenu");

	select_items.push_back (MenuElem (_("Select All in Track"), sigc::bind (sigc::mem_fun(*this, &Editor::select_all_in_track), Selection::Set)));
	select_items.push_back (MenuElem (_("Select All"), sigc::bind (sigc::mem_fun(*this, &Editor::select_all), Selection::Set)));
	select_items.push_back (MenuElem (_("Invert Selection in Track"), sigc::mem_fun(*this, &Editor::invert_selection_in_track)));
	select_items.push_back (MenuElem (_("Invert Selection"), sigc::mem_fun(*this, &Editor::invert_selection)));
	select_items.push_back (SeparatorElem());
	select_items.push_back (MenuElem (_("Select All After Edit Point"), sigc::bind (sigc::mem_fun(*this, &Editor::select_all_selectables_using_edit), true)));
	select_items.push_back (MenuElem (_("Select All Before Edit Point"), sigc::bind (sigc::mem_fun(*this, &Editor::select_all_selectables_using_edit), false)));
	select_items.push_back (MenuElem (_("Select All After Playhead"), sigc::bind (sigc::mem_fun(*this, &Editor::select_all_selectables_using_cursor), playhead_cursor, true)));
	select_items.push_back (MenuElem (_("Select All Before Playhead"), sigc::bind (sigc::mem_fun(*this, &Editor::select_all_selectables_using_cursor), playhead_cursor, false)));

	edit_items.push_back (MenuElem (_("Select"), *select_menu));

	/* Cut-n-Paste */

	Menu *cutnpaste_menu = manage (new Menu);
	MenuList& cutnpaste_items = cutnpaste_menu->items();
	cutnpaste_menu->set_name ("ArdourContextMenu");

	cutnpaste_items.push_back (MenuElem (_("Cut"), sigc::mem_fun(*this, &Editor::cut)));
	cutnpaste_items.push_back (MenuElem (_("Copy"), sigc::mem_fun(*this, &Editor::copy)));
	cutnpaste_items.push_back (MenuElem (_("Paste"), sigc::bind (sigc::mem_fun(*this, &Editor::paste), 1.0f)));

	Menu *nudge_menu = manage (new Menu());
	MenuList& nudge_items = nudge_menu->items();
	nudge_menu->set_name ("ArdourContextMenu");

	edit_items.push_back (SeparatorElem());
	nudge_items.push_back (MenuElem (_("Nudge Entire Track Forward"), (sigc::bind (sigc::mem_fun(*this, &Editor::nudge_track), false, true))));
	nudge_items.push_back (MenuElem (_("Nudge Track After Edit Point Forward"), (sigc::bind (sigc::mem_fun(*this, &Editor::nudge_track), true, true))));
	nudge_items.push_back (MenuElem (_("Nudge Entire Track Backward"), (sigc::bind (sigc::mem_fun(*this, &Editor::nudge_track), false, false))));
	nudge_items.push_back (MenuElem (_("Nudge Track After Edit Point Backward"), (sigc::bind (sigc::mem_fun(*this, &Editor::nudge_track), true, false))));

	edit_items.push_back (MenuElem (_("Nudge"), *nudge_menu));
}

SnapType
Editor::snap_type() const
{
	return _snap_type;
}

SnapMode
Editor::snap_mode() const
{
	return _snap_mode;
}

void
Editor::set_snap_to (SnapType st)
{
	unsigned int snap_ind = (unsigned int)st;

	_snap_type = st;

	if (snap_ind > snap_type_strings.size() - 1) {
		snap_ind = 0;
		_snap_type = (SnapType)snap_ind;
	}

	string str = snap_type_strings[snap_ind];

	if (str != snap_type_selector.get_active_text()) {
		snap_type_selector.set_active_text (str);
	}

	instant_save ();

	switch (_snap_type) {
	case SnapToBeatDiv32:
	case SnapToBeatDiv28:
	case SnapToBeatDiv24:
	case SnapToBeatDiv20:
	case SnapToBeatDiv16:
	case SnapToBeatDiv14:
	case SnapToBeatDiv12:
	case SnapToBeatDiv10:
	case SnapToBeatDiv8:
	case SnapToBeatDiv7:
	case SnapToBeatDiv6:
	case SnapToBeatDiv5:
	case SnapToBeatDiv4:
	case SnapToBeatDiv3:
	case SnapToBeatDiv2:
		compute_bbt_ruler_scale (leftmost_frame, leftmost_frame + current_page_frames());
		update_tempo_based_rulers ();
		break;

	case SnapToRegionStart:
	case SnapToRegionEnd:
	case SnapToRegionSync:
	case SnapToRegionBoundary:
		build_region_boundary_cache ();
		break;

	default:
		/* relax */
		break;
	}

	SnapChanged (); /* EMIT SIGNAL */
}

void
Editor::set_snap_mode (SnapMode mode)
{
	_snap_mode = mode;
	string str = snap_mode_strings[(int)mode];

	if (str != snap_mode_selector.get_active_text ()) {
		snap_mode_selector.set_active_text (str);
	}

	instant_save ();
}
void
Editor::set_edit_point_preference (EditPoint ep, bool force)
{
	bool changed = (_edit_point != ep);

	_edit_point = ep;
	string str = edit_point_strings[(int)ep];

	if (str != edit_point_selector.get_active_text ()) {
		edit_point_selector.set_active_text (str);
	}

	set_canvas_cursor ();

	if (!force && !changed) {
		return;
	}

	const char* action=NULL;

	switch (_edit_point) {
	case EditAtPlayhead:
		action = "edit-at-playhead";
		break;
	case EditAtSelectedMarker:
		action = "edit-at-marker";
		break;
	case EditAtMouse:
		action = "edit-at-mouse";
		break;
	}

	Glib::RefPtr<Action> act = ActionManager::get_action ("Editor", action);
	if (act) {
		Glib::RefPtr<RadioAction>::cast_dynamic(act)->set_active (true);
	}

	framepos_t foo;
	bool in_track_canvas;

	if (!mouse_frame (foo, in_track_canvas)) {
		in_track_canvas = false;
	}

	reset_canvas_action_sensitivity (in_track_canvas);

	instant_save ();
}

int
Editor::set_state (const XMLNode& node, int /*version*/)
{
	const XMLProperty* prop;
	XMLNode* geometry;
	int x, y;
	Gdk::Geometry g;

	if ((prop = node.property ("id")) != 0) {
		_id = prop->value ();
	}

	g.base_width = default_width;
	g.base_height = default_height;
	x = 1;
	y = 1;

	if ((geometry = find_named_node (node, "geometry")) != 0) {

		XMLProperty* prop;

		if ((prop = geometry->property("x_size")) == 0) {
			prop = geometry->property ("x-size");
		}
		if (prop) {
			g.base_width = atoi(prop->value());
		}
		if ((prop = geometry->property("y_size")) == 0) {
			prop = geometry->property ("y-size");
		}
		if (prop) {
			g.base_height = atoi(prop->value());
		}

		if ((prop = geometry->property ("x_pos")) == 0) {
			prop = geometry->property ("x-pos");
		}
		if (prop) {
			x = atoi (prop->value());

		}
		if ((prop = geometry->property ("y_pos")) == 0) {
			prop = geometry->property ("y-pos");
		}
		if (prop) {
			y = atoi (prop->value());
		}
	}

	set_default_size (g.base_width, g.base_height);
	move (x, y);

	if (_session && (prop = node.property ("playhead"))) {
		framepos_t pos;
		sscanf (prop->value().c_str(), "%" PRIi64, &pos);
		playhead_cursor->set_position (pos);
	} else {
		playhead_cursor->set_position (0);
	}

	if ((prop = node.property ("mixer-width"))) {
		editor_mixer_strip_width = Width (string_2_enum (prop->value(), editor_mixer_strip_width));
	}

	if ((prop = node.property ("zoom-focus"))) {
		set_zoom_focus ((ZoomFocus) atoi (prop->value()));
	}

	if ((prop = node.property ("zoom"))) {
		reset_zoom (PBD::atof (prop->value()));
	} else {
		reset_zoom (frames_per_unit);
	}

	if ((prop = node.property ("snap-to"))) {
		set_snap_to ((SnapType) atoi (prop->value()));
	}

	if ((prop = node.property ("snap-mode"))) {
		set_snap_mode ((SnapMode) atoi (prop->value()));
	}

	if ((prop = node.property ("mouse-mode"))) {
		MouseMode m = str2mousemode(prop->value());
		set_mouse_mode (m, true);
	} else {
		set_mouse_mode (MouseObject, true);
	}

	if ((prop = node.property ("left-frame")) != 0) {
		framepos_t pos;
		if (sscanf (prop->value().c_str(), "%" PRId64, &pos) == 1) {
			reset_x_origin (pos);
		}
	}

	if ((prop = node.property ("y-origin")) != 0) {
		reset_y_origin (atof (prop->value ()));
	}

	if ((prop = node.property ("internal-edit"))) {
		bool yn = string_is_affirmative (prop->value());
		RefPtr<Action> act = ActionManager::get_action (X_("MouseMode"), X_("toggle-internal-edit"));
		if (act) {
			RefPtr<ToggleAction> tact = RefPtr<ToggleAction>::cast_dynamic(act);
			tact->set_active (!yn);
			tact->set_active (yn);
		}
	}

	if ((prop = node.property ("join-object-range"))) {
		join_object_range_button.set_active (string_is_affirmative (prop->value ()));
	}

	if ((prop = node.property ("edit-point"))) {
		set_edit_point_preference ((EditPoint) string_2_enum (prop->value(), _edit_point), true);
	}

	if ((prop = node.property ("show-measures"))) {
		bool yn = string_is_affirmative (prop->value());
		_show_measures = yn;
		RefPtr<Action> act = ActionManager::get_action (X_("Editor"), X_("ToggleMeasureVisibility"));
		if (act) {
			RefPtr<ToggleAction> tact = RefPtr<ToggleAction>::cast_dynamic(act);
			/* do it twice to force the change */
			tact->set_active (!yn);
			tact->set_active (yn);
		}
	}

	if ((prop = node.property ("follow-playhead"))) {
		bool yn = string_is_affirmative (prop->value());
		set_follow_playhead (yn);
		RefPtr<Action> act = ActionManager::get_action (X_("Editor"), X_("toggle-follow-playhead"));
		if (act) {
			RefPtr<ToggleAction> tact = RefPtr<ToggleAction>::cast_dynamic(act);
			if (tact->get_active() != yn) {
				tact->set_active (yn);
			}
		}
	}

	if ((prop = node.property ("stationary-playhead"))) {
		bool yn = string_is_affirmative (prop->value());
		set_stationary_playhead (yn);
		RefPtr<Action> act = ActionManager::get_action (X_("Editor"), X_("toggle-stationary-playhead"));
		if (act) {
			RefPtr<ToggleAction> tact = RefPtr<ToggleAction>::cast_dynamic(act);
			if (tact->get_active() != yn) {
				tact->set_active (yn);
			}
		}
	}

	if ((prop = node.property ("region-list-sort-type"))) {
		RegionListSortType st;
		_regions->reset_sort_type ((RegionListSortType) string_2_enum (prop->value(), st), true);
	}

	if ((prop = node.property ("xfades-visible"))) {
		bool yn = string_is_affirmative (prop->value());
		_xfade_visibility = !yn;
		// set_xfade_visibility (yn);
	}

	if ((prop = node.property ("show-editor-mixer"))) {

		Glib::RefPtr<Action> act = ActionManager::get_action (X_("Editor"), X_("show-editor-mixer"));
		assert (act);

		Glib::RefPtr<ToggleAction> tact = Glib::RefPtr<ToggleAction>::cast_dynamic(act);
		bool yn = string_is_affirmative (prop->value());

		/* do it twice to force the change */

		tact->set_active (!yn);
		tact->set_active (yn);
	}

	if ((prop = node.property ("show-editor-list"))) {

		Glib::RefPtr<Action> act = ActionManager::get_action (X_("Editor"), X_("show-editor-list"));
		assert (act);

		Glib::RefPtr<ToggleAction> tact = Glib::RefPtr<ToggleAction>::cast_dynamic(act);
		bool yn = string_is_affirmative (prop->value());

		/* do it twice to force the change */

		tact->set_active (!yn);
		tact->set_active (yn);
	}

	if ((prop = node.property (X_("editor-list-page")))) {
		_the_notebook.set_current_page (atoi (prop->value ()));
	}

	if ((prop = node.property (X_("show-marker-lines")))) {
		Glib::RefPtr<Action> act = ActionManager::get_action (X_("Editor"), X_("show-marker-lines"));
		assert (act);
		Glib::RefPtr<ToggleAction> tact = Glib::RefPtr<ToggleAction>::cast_dynamic (act);
		bool yn = string_is_affirmative (prop->value ());

		tact->set_active (!yn);
		tact->set_active (yn);
	}

	XMLNodeList children = node.children ();
	for (XMLNodeList::const_iterator i = children.begin(); i != children.end(); ++i) {
		selection->set_state (**i, Stateful::current_state_version);
		_regions->set_state (**i);
	}

	return 0;
}

XMLNode&
Editor::get_state ()
{
	XMLNode* node = new XMLNode ("Editor");
	char buf[32];

	_id.print (buf, sizeof (buf));
	node->add_property ("id", buf);

	if (is_realized()) {
		Glib::RefPtr<Gdk::Window> win = get_window();

		int x, y, width, height;
		win->get_root_origin(x, y);
		win->get_size(width, height);

		XMLNode* geometry = new XMLNode ("geometry");

		snprintf(buf, sizeof(buf), "%d", width);
		geometry->add_property("x-size", string(buf));
		snprintf(buf, sizeof(buf), "%d", height);
		geometry->add_property("y-size", string(buf));
		snprintf(buf, sizeof(buf), "%d", x);
		geometry->add_property("x-pos", string(buf));
		snprintf(buf, sizeof(buf), "%d", y);
		geometry->add_property("y-pos", string(buf));
		snprintf(buf,sizeof(buf), "%d",gtk_paned_get_position (static_cast<Paned*>(&edit_pane)->gobj()));
		geometry->add_property("edit-horizontal-pane-pos", string(buf));
		geometry->add_property("notebook-shrunk", _notebook_shrunk ? "1" : "0");
		snprintf(buf,sizeof(buf), "%d",pre_maximal_horizontal_pane_position);
		geometry->add_property("pre-maximal-horizontal-pane-position", string(buf));
		snprintf(buf,sizeof(buf), "%d",gtk_paned_get_position (static_cast<Paned*>(&editor_summary_pane)->gobj()));
		geometry->add_property("edit-vertical-pane-pos", string(buf));

		node->add_child_nocopy (*geometry);
	}

	maybe_add_mixer_strip_width (*node);

	snprintf (buf, sizeof(buf), "%d", (int) zoom_focus);
	node->add_property ("zoom-focus", buf);
	snprintf (buf, sizeof(buf), "%f", frames_per_unit);
	node->add_property ("zoom", buf);
	snprintf (buf, sizeof(buf), "%d", (int) _snap_type);
	node->add_property ("snap-to", buf);
	snprintf (buf, sizeof(buf), "%d", (int) _snap_mode);
	node->add_property ("snap-mode", buf);

	node->add_property ("edit-point", enum_2_string (_edit_point));

	snprintf (buf, sizeof (buf), "%" PRIi64, playhead_cursor->current_frame);
	node->add_property ("playhead", buf);
	snprintf (buf, sizeof (buf), "%" PRIi64, leftmost_frame);
	node->add_property ("left-frame", buf);
	snprintf (buf, sizeof (buf), "%f", vertical_adjustment.get_value ());
	node->add_property ("y-origin", buf);

	node->add_property ("show-measures", _show_measures ? "yes" : "no");
	node->add_property ("follow-playhead", _follow_playhead ? "yes" : "no");
	node->add_property ("stationary-playhead", _stationary_playhead ? "yes" : "no");
	node->add_property ("xfades-visible", _xfade_visibility ? "yes" : "no");
	node->add_property ("region-list-sort-type", enum_2_string (_regions->sort_type ()));
	node->add_property ("mouse-mode", enum2str(mouse_mode));
	node->add_property ("internal-edit", _internal_editing ? "yes" : "no");
	node->add_property ("join-object-range", join_object_range_button.get_active () ? "yes" : "no");

	Glib::RefPtr<Action> act = ActionManager::get_action (X_("Editor"), X_("show-editor-mixer"));
	if (act) {
		Glib::RefPtr<ToggleAction> tact = Glib::RefPtr<ToggleAction>::cast_dynamic(act);
		node->add_property (X_("show-editor-mixer"), tact->get_active() ? "yes" : "no");
	}

	act = ActionManager::get_action (X_("Editor"), X_("show-editor-list"));
	if (act) {
		Glib::RefPtr<ToggleAction> tact = Glib::RefPtr<ToggleAction>::cast_dynamic(act);
		node->add_property (X_("show-editor-list"), tact->get_active() ? "yes" : "no");
	}

	snprintf (buf, sizeof (buf), "%d", _the_notebook.get_current_page ());
	node->add_property (X_("editor-list-page"), buf);

        if (button_bindings) {
                XMLNode* bb = new XMLNode (X_("Buttons"));
                button_bindings->save (*bb);
                node->add_child_nocopy (*bb);
        }

	node->add_property (X_("show-marker-lines"), _show_marker_lines ? "yes" : "no");

	node->add_child_nocopy (selection->get_state ());
	node->add_child_nocopy (_regions->get_state ());

	return *node;
}



/** @param y y offset from the top of all trackviews.
 *  @return pair: TimeAxisView that y is over, layer index.
 *  TimeAxisView may be 0.  Layer index is the layer number if the TimeAxisView is valid and is
 *  in stacked region display mode, otherwise 0.
 */
std::pair<TimeAxisView *, layer_t>
Editor::trackview_by_y_position (double y)
{
	for (TrackViewList::iterator iter = track_views.begin(); iter != track_views.end(); ++iter) {

		std::pair<TimeAxisView*, int> const r = (*iter)->covers_y_position (y);
		if (r.first) {
			return r;
		}
	}

	return std::make_pair ( (TimeAxisView *) 0, 0);
}

/** Snap a position to the grid, if appropriate, taking into account current
 *  grid settings and also the state of any snap modifier keys that may be pressed.
 *  @param start Position to snap.
 *  @param event Event to get current key modifier information from, or 0.
 */
void
Editor::snap_to_with_modifier (framepos_t& start, GdkEvent const * event, int32_t direction, bool for_mark)
{
	if (!_session || !event) {
		return;
	}

	if (Keyboard::modifier_state_contains (event->button.state, Keyboard::snap_modifier())) {
		if (_snap_mode == SnapOff) {
			snap_to_internal (start, direction, for_mark);
		}
	} else {
		if (_snap_mode != SnapOff) {
			snap_to_internal (start, direction, for_mark);
		}
	}
}

void
Editor::snap_to (framepos_t& start, int32_t direction, bool for_mark)
{
	if (!_session || _snap_mode == SnapOff) {
		return;
	}

	snap_to_internal (start, direction, for_mark);
}

void
Editor::timecode_snap_to_internal (framepos_t& start, int32_t direction, bool /*for_mark*/)
{
	const framepos_t one_timecode_second = (framepos_t)(rint(_session->timecode_frames_per_second()) * _session->frames_per_timecode_frame());
	framepos_t one_timecode_minute = (framepos_t)(rint(_session->timecode_frames_per_second()) * _session->frames_per_timecode_frame() * 60);

	switch (_snap_type) {
	case SnapToTimecodeFrame:
		if (((direction == 0) && (fmod((double)start, (double)_session->frames_per_timecode_frame()) > (_session->frames_per_timecode_frame() / 2))) || (direction > 0)) {
			start = (framepos_t) (ceil ((double) start / _session->frames_per_timecode_frame()) * _session->frames_per_timecode_frame());
		} else {
			start = (framepos_t) (floor ((double) start / _session->frames_per_timecode_frame()) *  _session->frames_per_timecode_frame());
		}
		break;

	case SnapToTimecodeSeconds:
		if (_session->config.get_timecode_offset_negative()) {
			start += _session->config.get_timecode_offset ();
		} else {
			start -= _session->config.get_timecode_offset ();
		}
		if (((direction == 0) && (start % one_timecode_second > one_timecode_second / 2)) || direction > 0) {
			start = (framepos_t) ceil ((double) start / one_timecode_second) * one_timecode_second;
		} else {
			start = (framepos_t) floor ((double) start / one_timecode_second) * one_timecode_second;
		}

		if (_session->config.get_timecode_offset_negative()) {
			start -= _session->config.get_timecode_offset ();
		} else {
			start += _session->config.get_timecode_offset ();
		}
		break;

	case SnapToTimecodeMinutes:
		if (_session->config.get_timecode_offset_negative()) {
			start += _session->config.get_timecode_offset ();
		} else {
			start -= _session->config.get_timecode_offset ();
		}
		if (((direction == 0) && (start % one_timecode_minute > one_timecode_minute / 2)) || direction > 0) {
			start = (framepos_t) ceil ((double) start / one_timecode_minute) * one_timecode_minute;
		} else {
			start = (framepos_t) floor ((double) start / one_timecode_minute) * one_timecode_minute;
		}
		if (_session->config.get_timecode_offset_negative()) {
			start -= _session->config.get_timecode_offset ();
		} else {
			start += _session->config.get_timecode_offset ();
		}
		break;
	default:
		fatal << "Editor::smpte_snap_to_internal() called with non-timecode snap type!" << endmsg;
		/*NOTREACHED*/
	}
}

void
Editor::snap_to_internal (framepos_t& start, int32_t direction, bool for_mark)
{
	const framepos_t one_second = _session->frame_rate();
	const framepos_t one_minute = _session->frame_rate() * 60;
	framepos_t presnap = start;
	framepos_t before;
	framepos_t after;

	switch (_snap_type) {
	case SnapToTimecodeFrame:
	case SnapToTimecodeSeconds:
	case SnapToTimecodeMinutes:
		return timecode_snap_to_internal (start, direction, for_mark);

	case SnapToCDFrame:
		if (((direction == 0) && (start % (one_second/75) > (one_second/75) / 2)) || (direction > 0)) {
			start = (framepos_t) ceil ((double) start / (one_second / 75)) * (one_second / 75);
		} else {
			start = (framepos_t) floor ((double) start / (one_second / 75)) * (one_second / 75);
		}
		break;

	case SnapToSeconds:
		if (((direction == 0) && (start % one_second > one_second / 2)) || (direction > 0)) {
			start = (framepos_t) ceil ((double) start / one_second) * one_second;
		} else {
			start = (framepos_t) floor ((double) start / one_second) * one_second;
		}
		break;

	case SnapToMinutes:
		if (((direction == 0) && (start % one_minute > one_minute / 2)) || (direction > 0)) {
			start = (framepos_t) ceil ((double) start / one_minute) * one_minute;
		} else {
			start = (framepos_t) floor ((double) start / one_minute) * one_minute;
		}
		break;

	case SnapToBar:
		start = _session->tempo_map().round_to_bar (start, direction);
		break;

	case SnapToBeat:
		start = _session->tempo_map().round_to_beat (start, direction);
		break;

	case SnapToBeatDiv32:
		start = _session->tempo_map().round_to_beat_subdivision (start, 32, direction);
		break;
	case SnapToBeatDiv28:
		start = _session->tempo_map().round_to_beat_subdivision (start, 28, direction);
		break;
	case SnapToBeatDiv24:
		start = _session->tempo_map().round_to_beat_subdivision (start, 24, direction);
		break;
	case SnapToBeatDiv20:
		start = _session->tempo_map().round_to_beat_subdivision (start, 20, direction);
		break;
	case SnapToBeatDiv16:
		start = _session->tempo_map().round_to_beat_subdivision (start, 16, direction);
		break;
	case SnapToBeatDiv14:
		start = _session->tempo_map().round_to_beat_subdivision (start, 14, direction);
		break;
	case SnapToBeatDiv12:
		start = _session->tempo_map().round_to_beat_subdivision (start, 12, direction);
		break;
	case SnapToBeatDiv10:
		start = _session->tempo_map().round_to_beat_subdivision (start, 10, direction);
		break;
	case SnapToBeatDiv8:
		start = _session->tempo_map().round_to_beat_subdivision (start, 8, direction);
		break;
	case SnapToBeatDiv7:
		start = _session->tempo_map().round_to_beat_subdivision (start, 7, direction);
		break;
	case SnapToBeatDiv6:
		start = _session->tempo_map().round_to_beat_subdivision (start, 6, direction);
		break;
	case SnapToBeatDiv5:
		start = _session->tempo_map().round_to_beat_subdivision (start, 5, direction);
		break;
	case SnapToBeatDiv4:
		start = _session->tempo_map().round_to_beat_subdivision (start, 4, direction);
		break;
	case SnapToBeatDiv3:
		start = _session->tempo_map().round_to_beat_subdivision (start, 3, direction);
		break;
	case SnapToBeatDiv2:
		start = _session->tempo_map().round_to_beat_subdivision (start, 2, direction);
		break;

	case SnapToMark:
		if (for_mark) {
			return;
		}

		_session->locations()->marks_either_side (start, before, after);

		if (before == max_framepos) {
			start = after;
		} else if (after == max_framepos) {
			start = before;
		} else if (before != max_framepos && after != max_framepos) {
			/* have before and after */
			if ((start - before) < (after - start)) {
				start = before;
			} else {
				start = after;
			}
		}

		break;

	case SnapToRegionStart:
	case SnapToRegionEnd:
	case SnapToRegionSync:
	case SnapToRegionBoundary:
		if (!region_boundary_cache.empty()) {

			vector<framepos_t>::iterator prev = region_boundary_cache.end ();
			vector<framepos_t>::iterator next = region_boundary_cache.end ();

			if (direction > 0) {
				next = std::upper_bound (region_boundary_cache.begin(), region_boundary_cache.end(), start);
			} else {
				next = std::lower_bound (region_boundary_cache.begin(), region_boundary_cache.end(), start);
			}

			if (next != region_boundary_cache.begin ()) {
				prev = next;
				prev--;
			}

			framepos_t const p = (prev == region_boundary_cache.end()) ? region_boundary_cache.front () : *prev;
			framepos_t const n = (next == region_boundary_cache.end()) ? region_boundary_cache.back () : *next;

			if (start > (p + n) / 2) {
				start = n;
			} else {
				start = p;
			}
		}
		break;
	}

	switch (_snap_mode) {
	case SnapNormal:
		return;

	case SnapMagnetic:

		if (presnap > start) {
			if (presnap > (start + unit_to_frame(snap_threshold))) {
				start = presnap;
			}

		} else if (presnap < start) {
			if (presnap < (start - unit_to_frame(snap_threshold))) {
				start = presnap;
			}
		}

	default:
		/* handled at entry */
		return;

	}
}


void
Editor::setup_toolbar ()
{
	HBox* mode_box = manage(new HBox);
	mode_box->set_border_width (2);
	mode_box->set_spacing(4);

	/* table containing mode buttons */

	HBox* mouse_mode_button_box = manage (new HBox ());

	if (Profile->get_sae()) {
		mouse_mode_button_box->pack_start (mouse_move_button);
	} else {
		mouse_mode_button_box->pack_start (mouse_move_button);
		mouse_mode_button_box->pack_start (join_object_range_button);
		mouse_mode_button_box->pack_start (mouse_select_button);
	}

	mouse_mode_button_box->pack_start (mouse_zoom_button);

	if (!Profile->get_sae()) {
		mouse_mode_button_box->pack_start (mouse_gain_button);
	}

	mouse_mode_button_box->pack_start (mouse_timefx_button);
	mouse_mode_button_box->pack_start (mouse_audition_button);
	mouse_mode_button_box->pack_start (internal_edit_button);

	edit_mode_strings.push_back (edit_mode_to_string (Slide));
	if (!Profile->get_sae()) {
		edit_mode_strings.push_back (edit_mode_to_string (Splice));
	}
	edit_mode_strings.push_back (edit_mode_to_string (Lock));

	edit_mode_selector.set_name ("EditModeSelector");
	set_popdown_strings (edit_mode_selector, edit_mode_strings, true);
	edit_mode_selector.signal_changed().connect (sigc::mem_fun(*this, &Editor::edit_mode_selection_done));

	mode_box->pack_start (edit_mode_selector);
	mode_box->pack_start (*mouse_mode_button_box);

	_mouse_mode_tearoff = manage (new TearOff (*mode_box));
	_mouse_mode_tearoff->set_name ("MouseModeBase");
	_mouse_mode_tearoff->tearoff_window().signal_key_press_event().connect (sigc::bind (sigc::ptr_fun (relay_key_press), &_mouse_mode_tearoff->tearoff_window()), false);

	if (Profile->get_sae()) {
		_mouse_mode_tearoff->set_can_be_torn_off (false);
	}

	_mouse_mode_tearoff->Detach.connect (sigc::bind (sigc::mem_fun(*this, &Editor::detach_tearoff), static_cast<Box*>(&toolbar_hbox),
	                                                 &_mouse_mode_tearoff->tearoff_window()));
	_mouse_mode_tearoff->Attach.connect (sigc::bind (sigc::mem_fun(*this, &Editor::reattach_tearoff), static_cast<Box*> (&toolbar_hbox),
	                                                 &_mouse_mode_tearoff->tearoff_window(), 1));
	_mouse_mode_tearoff->Hidden.connect (sigc::bind (sigc::mem_fun(*this, &Editor::detach_tearoff), static_cast<Box*>(&toolbar_hbox),
	                                                 &_mouse_mode_tearoff->tearoff_window()));
	_mouse_mode_tearoff->Visible.connect (sigc::bind (sigc::mem_fun(*this, &Editor::reattach_tearoff), static_cast<Box*> (&toolbar_hbox),
	                                                  &_mouse_mode_tearoff->tearoff_window(), 1));

	mouse_move_button.set_mode (false);
	mouse_select_button.set_mode (false);
	mouse_gain_button.set_mode (false);
	mouse_zoom_button.set_mode (false);
	mouse_timefx_button.set_mode (false);
	mouse_audition_button.set_mode (false);
	join_object_range_button.set_mode (false);

	mouse_move_button.set_name ("MouseModeButton");
	mouse_select_button.set_name ("MouseModeButton");
	mouse_gain_button.set_name ("MouseModeButton");
	mouse_zoom_button.set_name ("MouseModeButton");
	mouse_timefx_button.set_name ("MouseModeButton");
	mouse_audition_button.set_name ("MouseModeButton");
	internal_edit_button.set_name ("MouseModeButton");
	join_object_range_button.set_name ("MouseModeButton");

	mouse_move_button.unset_flags (CAN_FOCUS);
	mouse_select_button.unset_flags (CAN_FOCUS);
	mouse_gain_button.unset_flags (CAN_FOCUS);
	mouse_zoom_button.unset_flags (CAN_FOCUS);
	mouse_timefx_button.unset_flags (CAN_FOCUS);
	mouse_audition_button.unset_flags (CAN_FOCUS);
	internal_edit_button.unset_flags (CAN_FOCUS);
	join_object_range_button.unset_flags (CAN_FOCUS);

	/* Zoom */

	_zoom_box.set_spacing (1);
	_zoom_box.set_border_width (0);

	zoom_in_button.set_name ("EditorTimeButton");
	zoom_in_button.set_image (*(manage (new Image (::get_icon ("zoom_in")))));
	zoom_in_button.signal_clicked().connect (sigc::bind (sigc::mem_fun(*this, &Editor::temporal_zoom_step), false));

	zoom_out_button.set_name ("EditorTimeButton");
	zoom_out_button.set_image (*(manage (new Image (::get_icon ("zoom_out")))));
	zoom_out_button.signal_clicked().connect (sigc::bind (sigc::mem_fun(*this, &Editor::temporal_zoom_step), true));

	zoom_out_full_button.set_name ("EditorTimeButton");
	zoom_out_full_button.set_image (*(manage (new Image (::get_icon ("zoom_full")))));
	zoom_out_full_button.signal_clicked().connect (sigc::mem_fun(*this, &Editor::temporal_zoom_session));

	zoom_focus_selector.set_name ("ZoomFocusSelector");
	set_popdown_strings (zoom_focus_selector, zoom_focus_strings, true);
	zoom_focus_selector.signal_changed().connect (sigc::mem_fun(*this, &Editor::zoom_focus_selection_done));

	_zoom_box.pack_start (zoom_out_button, false, false);
	_zoom_box.pack_start (zoom_in_button, false, false);
	_zoom_box.pack_start (zoom_out_full_button, false, false);

	_zoom_box.pack_start (zoom_focus_selector);

	/* Track zoom buttons */
	tav_expand_button.set_name ("TrackHeightButton");
	tav_expand_button.set_size_request (-1, 20);
	tav_expand_button.add (*(manage (new Image (::get_icon ("tav_exp")))));
	RefPtr<Action> act = ActionManager::get_action (X_("Editor"), X_("expand-tracks"));
	act->connect_proxy (tav_expand_button);

	tav_shrink_button.set_name ("TrackHeightButton");
	tav_shrink_button.set_size_request (-1, 20);
	tav_shrink_button.add (*(manage (new Image (::get_icon ("tav_shrink")))));
	act = ActionManager::get_action (X_("Editor"), X_("shrink-tracks"));
	act->connect_proxy (tav_shrink_button);

	_zoom_box.pack_start (tav_shrink_button);
	_zoom_box.pack_start (tav_expand_button);

	_zoom_tearoff = manage (new TearOff (_zoom_box));

	_zoom_tearoff->Detach.connect (sigc::bind (sigc::mem_fun(*this, &Editor::detach_tearoff), static_cast<Box*>(&toolbar_hbox),
						   &_zoom_tearoff->tearoff_window()));
	_zoom_tearoff->Attach.connect (sigc::bind (sigc::mem_fun(*this, &Editor::reattach_tearoff), static_cast<Box*> (&toolbar_hbox),
						   &_zoom_tearoff->tearoff_window(), 0));
	_zoom_tearoff->Hidden.connect (sigc::bind (sigc::mem_fun(*this, &Editor::detach_tearoff), static_cast<Box*>(&toolbar_hbox),
						   &_zoom_tearoff->tearoff_window()));
	_zoom_tearoff->Visible.connect (sigc::bind (sigc::mem_fun(*this, &Editor::reattach_tearoff), static_cast<Box*> (&toolbar_hbox),
						    &_zoom_tearoff->tearoff_window(), 0));

	snap_box.set_spacing (1);
	snap_box.set_border_width (2);

	snap_type_selector.set_name ("SnapTypeSelector");
	set_popdown_strings (snap_type_selector, snap_type_strings, true);
	snap_type_selector.signal_changed().connect (sigc::mem_fun(*this, &Editor::snap_type_selection_done));

	snap_mode_selector.set_name ("SnapModeSelector");
	set_popdown_strings (snap_mode_selector, snap_mode_strings, true);
	snap_mode_selector.signal_changed().connect (sigc::mem_fun(*this, &Editor::snap_mode_selection_done));

	edit_point_selector.set_name ("EditPointSelector");
	set_popdown_strings (edit_point_selector, edit_point_strings, true);
	edit_point_selector.signal_changed().connect (sigc::mem_fun(*this, &Editor::edit_point_selection_done));

	snap_box.pack_start (snap_mode_selector, false, false);
	snap_box.pack_start (snap_type_selector, false, false);
	snap_box.pack_start (edit_point_selector, false, false);

	/* Nudge */

	HBox *nudge_box = manage (new HBox);
	nudge_box->set_spacing(1);
	nudge_box->set_border_width (2);

	nudge_forward_button.signal_button_release_event().connect (sigc::mem_fun(*this, &Editor::nudge_forward_release), false);
	nudge_backward_button.signal_button_release_event().connect (sigc::mem_fun(*this, &Editor::nudge_backward_release), false);

	nudge_box->pack_start (nudge_backward_button, false, false);
	nudge_box->pack_start (nudge_forward_button, false, false);
	nudge_box->pack_start (*nudge_clock, false, false);


	/* Pack everything in... */

	HBox* hbox = manage (new HBox);
	hbox->set_spacing(10);

	_tools_tearoff = manage (new TearOff (*hbox));
	_tools_tearoff->set_name ("MouseModeBase");
	_tools_tearoff->tearoff_window().signal_key_press_event().connect (sigc::bind (sigc::ptr_fun (relay_key_press), &_tools_tearoff->tearoff_window()), false);

	if (Profile->get_sae()) {
		_tools_tearoff->set_can_be_torn_off (false);
	}

	_tools_tearoff->Detach.connect (sigc::bind (sigc::mem_fun(*this, &Editor::detach_tearoff), static_cast<Box*>(&toolbar_hbox),
	                                            &_tools_tearoff->tearoff_window()));
	_tools_tearoff->Attach.connect (sigc::bind (sigc::mem_fun(*this, &Editor::reattach_tearoff), static_cast<Box*> (&toolbar_hbox),
	                                            &_tools_tearoff->tearoff_window(), 0));
	_tools_tearoff->Hidden.connect (sigc::bind (sigc::mem_fun(*this, &Editor::detach_tearoff), static_cast<Box*>(&toolbar_hbox),
	                                            &_tools_tearoff->tearoff_window()));
	_tools_tearoff->Visible.connect (sigc::bind (sigc::mem_fun(*this, &Editor::reattach_tearoff), static_cast<Box*> (&toolbar_hbox),
	                                             &_tools_tearoff->tearoff_window(), 0));

	toolbar_hbox.set_spacing (10);
	toolbar_hbox.set_border_width (1);

	toolbar_hbox.pack_start (*_mouse_mode_tearoff, false, false);
	toolbar_hbox.pack_start (*_zoom_tearoff, false, false);
	toolbar_hbox.pack_start (*_tools_tearoff, false, false);

	hbox->pack_start (snap_box, false, false);
        if (!Profile->get_small_screen()) {
                hbox->pack_start (*nudge_box, false, false);
        } else {
                ARDOUR_UI::instance()->editor_transport_box().pack_start (*nudge_box, false, false);
        }
	hbox->pack_start (panic_box, false, false);

	hbox->show_all ();

	toolbar_base.set_name ("ToolBarBase");
	toolbar_base.add (toolbar_hbox);

	_toolbar_viewport.add (toolbar_base);
	/* stick to the required height but allow width to vary if there's not enough room */
	_toolbar_viewport.set_size_request (1, -1);

	toolbar_frame.set_shadow_type (SHADOW_OUT);
	toolbar_frame.set_name ("BaseFrame");
	toolbar_frame.add (_toolbar_viewport);

        DPIReset.connect (sigc::mem_fun (*this, &Editor::resize_text_widgets));
}

void
Editor::setup_tooltips ()
{
	ARDOUR_UI::instance()->set_tip (mouse_move_button, _("Select/Move Objects"));
	ARDOUR_UI::instance()->set_tip (mouse_gain_button, _("Draw Region Gain"));
	ARDOUR_UI::instance()->set_tip (mouse_zoom_button, _("Select Zoom Range"));
	ARDOUR_UI::instance()->set_tip (mouse_timefx_button, _("Stretch/Shrink Regions and MIDI Notes"));
	ARDOUR_UI::instance()->set_tip (mouse_audition_button, _("Listen to Specific Regions"));
	ARDOUR_UI::instance()->set_tip (join_object_range_button, _("Select/Move Objects or Ranges"));
	ARDOUR_UI::instance()->set_tip (internal_edit_button, _("Edit Region Contents (e.g. notes)"));
	ARDOUR_UI::instance()->set_tip (*_group_tabs, _("Groups: click to (de)activate\nContext-click for other operations"));
	ARDOUR_UI::instance()->set_tip (nudge_forward_button, _("Nudge Region/Selection Forwards"));
	ARDOUR_UI::instance()->set_tip (nudge_backward_button, _("Nudge Region/Selection Backwards"));
	ARDOUR_UI::instance()->set_tip (zoom_in_button, _("Zoom In"));
	ARDOUR_UI::instance()->set_tip (zoom_out_button, _("Zoom Out"));
	ARDOUR_UI::instance()->set_tip (zoom_out_full_button, _("Zoom to Session"));
	ARDOUR_UI::instance()->set_tip (zoom_focus_selector, _("Zoom focus"));
	ARDOUR_UI::instance()->set_tip (tav_expand_button, _("Expand Tracks"));
	ARDOUR_UI::instance()->set_tip (tav_shrink_button, _("Shrink Tracks"));
	ARDOUR_UI::instance()->set_tip (snap_type_selector, _("Snap/Grid Units"));
	ARDOUR_UI::instance()->set_tip (snap_mode_selector, _("Snap/Grid Mode"));
	ARDOUR_UI::instance()->set_tip (edit_point_selector, _("Edit point"));
	ARDOUR_UI::instance()->set_tip (midi_sound_notes, _("Sound Notes"));
	ARDOUR_UI::instance()->set_tip (midi_panic_button, _("Send note off and reset controller messages on all MIDI channels"));
	ARDOUR_UI::instance()->set_tip (edit_mode_selector, _("Edit Mode"));
}

void
Editor::midi_panic ()
{
	cerr << "MIDI panic\n";

	if (_session) {
		_session->midi_panic();
	}
}

void
Editor::setup_midi_toolbar ()
{
	RefPtr<Action> act;

	/* Midi sound notes */
	midi_sound_notes.add (*(manage (new Image (::get_icon("midi_sound_notes")))));
	midi_sound_notes.unset_flags (CAN_FOCUS);

	/* Panic */

	act = ActionManager::get_action (X_("MIDI"), X_("panic"));
	midi_panic_button.set_name("MidiPanicButton");
	act->connect_proxy (midi_panic_button);

	panic_box.pack_start (midi_sound_notes , true, true);
	panic_box.pack_start (midi_panic_button, true, true);
}

int
Editor::convert_drop_to_paths (
		vector<string>&                paths,
		const RefPtr<Gdk::DragContext>& /*context*/,
		gint                            /*x*/,
		gint                            /*y*/,
		const SelectionData&            data,
		guint                           /*info*/,
		guint                           /*time*/)
{
	if (_session == 0) {
		return -1;
	}

	vector<string> uris = data.get_uris();

	if (uris.empty()) {

		/* This is seriously fucked up. Nautilus doesn't say that its URI lists
		   are actually URI lists. So do it by hand.
		*/

		if (data.get_target() != "text/plain") {
			return -1;
		}

		/* Parse the "uri-list" format that Nautilus provides,
		   where each pathname is delimited by \r\n.

		   THERE MAY BE NO NULL TERMINATING CHAR!!!
		*/

		string txt = data.get_text();
		const char* p;
		const char* q;

		p = (const char *) malloc (txt.length() + 1);
		txt.copy ((char *) p, txt.length(), 0);
		((char*)p)[txt.length()] = '\0';

		while (p)
		{
			if (*p != '#')
			{
				while (g_ascii_isspace (*p))
					p++;

				q = p;
				while (*q && (*q != '\n') && (*q != '\r')) {
					q++;
				}

				if (q > p)
				{
					q--;
					while (q > p && g_ascii_isspace (*q))
						q--;

					if (q > p)
					{
						uris.push_back (string (p, q - p + 1));
					}
				}
			}
			p = strchr (p, '\n');
			if (p)
				p++;
		}

		free ((void*)p);

		if (uris.empty()) {
			return -1;
		}
	}

	for (vector<string>::iterator i = uris.begin(); i != uris.end(); ++i) {

		if ((*i).substr (0,7) == "file://") {

			string p = *i;
			PBD::url_decode (p);

			// scan forward past three slashes

			string::size_type slashcnt = 0;
			string::size_type n = 0;
			string::iterator x = p.begin();

			while (slashcnt < 3 && x != p.end()) {
				if ((*x) == '/') {
					slashcnt++;
				} else if (slashcnt == 3) {
					break;
				}
				++n;
				++x;
			}

			if (slashcnt != 3 || x == p.end()) {
				error << _("malformed URL passed to drag-n-drop code") << endmsg;
				continue;
			}

			paths.push_back (p.substr (n - 1));
		}
	}

	return 0;
}

void
Editor::new_tempo_section ()

{
}

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

	if (_session && _session->transport_stopped()) {
		have_pending_keyboard_selection = false;
	}

	update_loop_range_view (true);
}

/* UNDO/REDO */

Editor::State::State (PublicEditor const * e)
{
	selection = new Selection (e);
}

Editor::State::~State ()
{
	delete selection;
}

void
Editor::begin_reversible_command (string name)
{
	if (_session) {
		_session->begin_reversible_command (name);
	}
}

void
Editor::begin_reversible_command (GQuark q)
{
	if (_session) {
		_session->begin_reversible_command (q);
	}
}

void
Editor::commit_reversible_command ()
{
	if (_session) {
		_session->commit_reversible_command ();
	}
}

void
Editor::history_changed ()
{
	string label;

	if (undo_action && _session) {
		if (_session->undo_depth() == 0) {
			label = _("Undo");
		} else {
			label = string_compose(_("Undo (%1)"), _session->next_undo());
		}
		undo_action->property_label() = label;
	}

	if (redo_action && _session) {
		if (_session->redo_depth() == 0) {
			label = _("Redo");
		} else {
			label = string_compose(_("Redo (%1)"), _session->next_redo());
		}
		redo_action->property_label() = label;
	}
}

void
Editor::duplicate_dialog (bool with_dialog)
{
	float times = 1.0f;

	if (mouse_mode == MouseRange) {
		if (selection->time.length() == 0) {
			return;
		}
	}

	RegionSelection rs = get_regions_from_selection_and_entered ();

	if (mouse_mode != MouseRange && rs.empty()) {
		return;
	}

	if (with_dialog) {

		ArdourDialog win (_("Duplicate"));
		Label label (_("Number of duplications:"));
		Adjustment adjustment (1.0, 1.0, 1000000.0, 1.0, 5.0);
		SpinButton spinner (adjustment, 0.0, 1);
		HBox hbox;

		win.get_vbox()->set_spacing (12);
		win.get_vbox()->pack_start (hbox);
		hbox.set_border_width (6);
		hbox.pack_start (label, PACK_EXPAND_PADDING, 12);

		/* dialogs have ::add_action_widget() but that puts the spinner in the wrong
		   place, visually. so do this by hand.
		*/

		hbox.pack_start (spinner, PACK_EXPAND_PADDING, 12);
		spinner.signal_activate().connect (sigc::bind (sigc::mem_fun (win, &ArdourDialog::response), RESPONSE_ACCEPT));
		spinner.grab_focus();

		hbox.show ();
		label.show ();
		spinner.show ();

		win.add_button (Stock::CANCEL, RESPONSE_CANCEL);
		win.add_button (_("Duplicate"), RESPONSE_ACCEPT);
		win.set_default_response (RESPONSE_ACCEPT);

		win.set_position (WIN_POS_MOUSE);

		spinner.grab_focus ();

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

		times = adjustment.get_value();
	}

	if (mouse_mode == MouseRange) {
		duplicate_selection (times);
	} else {
		duplicate_some_regions (rs, times);
	}
}

void
Editor::set_edit_mode (EditMode m)
{
	Config->set_edit_mode (m);
}

void
Editor::cycle_edit_mode ()
{
	switch (Config->get_edit_mode()) {
	case Slide:
		if (Profile->get_sae()) {
			Config->set_edit_mode (Lock);
		} else {
			Config->set_edit_mode (Splice);
		}
		break;
	case Splice:
		Config->set_edit_mode (Lock);
		break;
	case Lock:
		Config->set_edit_mode (Slide);
		break;
	}
}

void
Editor::edit_mode_selection_done ()
{
        string s = edit_mode_selector.get_active_text ();

        if (!s.empty()) {
                Config->set_edit_mode (string_to_edit_mode (s));
        }
}

void
Editor::snap_type_selection_done ()
{
	string choice = snap_type_selector.get_active_text();
	SnapType snaptype = SnapToBeat;

	if (choice == _("Beats/2")) {
		snaptype = SnapToBeatDiv2;
	} else if (choice == _("Beats/3")) {
		snaptype = SnapToBeatDiv3;
	} else if (choice == _("Beats/4")) {
		snaptype = SnapToBeatDiv4;
	} else if (choice == _("Beats/5")) {
		snaptype = SnapToBeatDiv5;
	} else if (choice == _("Beats/6")) {
		snaptype = SnapToBeatDiv6;
	} else if (choice == _("Beats/7")) {
		snaptype = SnapToBeatDiv7;
	} else if (choice == _("Beats/8")) {
		snaptype = SnapToBeatDiv8;
	} else if (choice == _("Beats/10")) {
		snaptype = SnapToBeatDiv10;
	} else if (choice == _("Beats/12")) {
		snaptype = SnapToBeatDiv12;
	} else if (choice == _("Beats/14")) {
		snaptype = SnapToBeatDiv14;
	} else if (choice == _("Beats/16")) {
		snaptype = SnapToBeatDiv16;
	} else if (choice == _("Beats/20")) {
		snaptype = SnapToBeatDiv20;
	} else if (choice == _("Beats/24")) {
		snaptype = SnapToBeatDiv24;
	} else if (choice == _("Beats/28")) {
		snaptype = SnapToBeatDiv28;
	} else if (choice == _("Beats/32")) {
		snaptype = SnapToBeatDiv32;
	} else if (choice == _("Beats")) {
		snaptype = SnapToBeat;
	} else if (choice == _("Bars")) {
		snaptype = SnapToBar;
	} else if (choice == _("Marks")) {
		snaptype = SnapToMark;
	} else if (choice == _("Region starts")) {
		snaptype = SnapToRegionStart;
	} else if (choice == _("Region ends")) {
		snaptype = SnapToRegionEnd;
	} else if (choice == _("Region bounds")) {
		snaptype = SnapToRegionBoundary;
	} else if (choice == _("Region syncs")) {
		snaptype = SnapToRegionSync;
	} else if (choice == _("CD Frames")) {
		snaptype = SnapToCDFrame;
	} else if (choice == _("Timecode Frames")) {
		snaptype = SnapToTimecodeFrame;
	} else if (choice == _("Timecode Seconds")) {
		snaptype = SnapToTimecodeSeconds;
	} else if (choice == _("Timecode Minutes")) {
		snaptype = SnapToTimecodeMinutes;
	} else if (choice == _("Seconds")) {
		snaptype = SnapToSeconds;
	} else if (choice == _("Minutes")) {
		snaptype = SnapToMinutes;
	}

	RefPtr<RadioAction> ract = snap_type_action (snaptype);
	if (ract) {
		ract->set_active ();
	}
}

void
Editor::snap_mode_selection_done ()
{
	string choice = snap_mode_selector.get_active_text();
	SnapMode mode = SnapNormal;

	if (choice == _("No Grid")) {
		mode = SnapOff;
	} else if (choice == _("Grid")) {
		mode = SnapNormal;
	} else if (choice == _("Magnetic")) {
		mode = SnapMagnetic;
	}

	RefPtr<RadioAction> ract = snap_mode_action (mode);

	if (ract) {
		ract->set_active (true);
	}
}

void
Editor::cycle_edit_point (bool with_marker)
{
	switch (_edit_point) {
	case EditAtMouse:
		set_edit_point_preference (EditAtPlayhead);
		break;
	case EditAtPlayhead:
		if (with_marker) {
			set_edit_point_preference (EditAtSelectedMarker);
		} else {
			set_edit_point_preference (EditAtMouse);
		}
		break;
	case EditAtSelectedMarker:
		set_edit_point_preference (EditAtMouse);
		break;
	}
}

void
Editor::edit_point_selection_done ()
{
	string choice = edit_point_selector.get_active_text();
	EditPoint ep = EditAtSelectedMarker;

	if (choice == _("Marker")) {
		set_edit_point_preference (EditAtSelectedMarker);
	} else if (choice == _("Playhead")) {
		set_edit_point_preference (EditAtPlayhead);
	} else {
		set_edit_point_preference (EditAtMouse);
	}

	RefPtr<RadioAction> ract = edit_point_action (ep);

	if (ract) {
		ract->set_active (true);
	}
}

void
Editor::zoom_focus_selection_done ()
{
	string choice = zoom_focus_selector.get_active_text();
	ZoomFocus focus_type = ZoomFocusLeft;

	if (choice == _("Left")) {
		focus_type = ZoomFocusLeft;
	} else if (choice == _("Right")) {
		focus_type = ZoomFocusRight;
	} else if (choice == _("Center")) {
		focus_type = ZoomFocusCenter;
	} else if (choice == _("Playhead")) {
		focus_type = ZoomFocusPlayhead;
	} else if (choice == _("Mouse")) {
		focus_type = ZoomFocusMouse;
	} else if (choice == _("Edit point")) {
		focus_type = ZoomFocusEdit;
	}

	RefPtr<RadioAction> ract = zoom_focus_action (focus_type);

	if (ract) {
		ract->set_active ();
	}
}

bool
Editor::edit_controls_button_release (GdkEventButton* ev)
{
	if (Keyboard::is_context_menu_event (ev)) {
		ARDOUR_UI::instance()->add_route (this);
	} else if (ev->button == 1) {
		selection->clear_tracks ();
	}

	return true;
}

bool
Editor::mouse_select_button_release (GdkEventButton* ev)
{
	/* this handles just right-clicks */

	if (ev->button != 3) {
		return false;
	}

	return true;
}

void
Editor::set_zoom_focus (ZoomFocus f)
{
	string str = zoom_focus_strings[(int)f];

	if (str != zoom_focus_selector.get_active_text()) {
		zoom_focus_selector.set_active_text (str);
	}

	if (zoom_focus != f) {
		zoom_focus = f;
		instant_save ();
	}
}

void
Editor::ensure_float (Window& win)
{
	win.set_transient_for (*this);
}

void
Editor::pane_allocation_handler (Allocation &alloc, Paned* which)
{
	/* recover or initialize pane positions. do this here rather than earlier because
	   we don't want the positions to change the child allocations, which they seem to do.
	 */

	int pos;
	XMLProperty* prop;
	char buf[32];
	XMLNode* node = ARDOUR_UI::instance()->editor_settings();

	enum Pane {
		Horizontal = 0x1,
		Vertical = 0x2
	};

	static Pane done;

	XMLNode* geometry = find_named_node (*node, "geometry");

	if (which == static_cast<Paned*> (&edit_pane)) {

		if (done & Horizontal) {
			return;
		}

		if (geometry && (prop = geometry->property ("notebook-shrunk"))) {
			_notebook_shrunk = string_is_affirmative (prop->value ());
		}

		if (geometry && (prop = geometry->property ("pre-maximal-horizontal-pane-position"))) {
			pre_maximal_horizontal_pane_position = atoi (prop->value ());
		}

		if (!geometry || (prop = geometry->property ("edit-horizontal-pane-pos")) == 0) {
			/* initial allocation is 90% to canvas, 10% to notebook */
			pos = (int) floor (alloc.get_width() * 0.90f);
			snprintf (buf, sizeof(buf), "%d", pos);
		} else {
			pos = atoi (prop->value());
		}

		if (GTK_WIDGET(edit_pane.gobj())->allocation.width > pos) {
			edit_pane.set_position (pos);
			if (pre_maximal_horizontal_pane_position == 0) {
				pre_maximal_horizontal_pane_position = pos;
			}
		}

		done = (Pane) (done | Horizontal);

	} else if (which == static_cast<Paned*> (&editor_summary_pane)) {

		if (done & Vertical) {
			return;
		}

		if (!geometry || (prop = geometry->property ("edit-vertical-pane-pos")) == 0) {
			/* initial allocation is 90% to canvas, 10% to summary */
			pos = (int) floor (alloc.get_height() * 0.90f);
			snprintf (buf, sizeof(buf), "%d", pos);
		} else {
			pos = atoi (prop->value());
		}

		if (GTK_WIDGET(editor_summary_pane.gobj())->allocation.height > pos) {
			editor_summary_pane.set_position (pos);
			pre_maximal_vertical_pane_position = pos;
		}

		done = (Pane) (done | Vertical);
	}
}

void
Editor::detach_tearoff (Box* /*b*/, Window* /*w*/)
{
	if (_tools_tearoff->torn_off() && _mouse_mode_tearoff->torn_off()) {
		top_hbox.remove (toolbar_frame);
	}
}

void
Editor::reattach_tearoff (Box* /*b*/, Window* /*w*/, int32_t /*n*/)
{
	if (toolbar_frame.get_parent() == 0) {
		top_hbox.pack_end (toolbar_frame);
	}
}

void
Editor::set_show_measures (bool yn)
{
	if (_show_measures != yn) {
		hide_measures ();

		if ((_show_measures = yn) == true) {
			if (tempo_lines)
				tempo_lines->show();
			draw_measures ();
		}
		instant_save ();
	}
}

void
Editor::toggle_follow_playhead ()
{
	RefPtr<Action> act = ActionManager::get_action (X_("Editor"), X_("toggle-follow-playhead"));
	if (act) {
		RefPtr<ToggleAction> tact = RefPtr<ToggleAction>::cast_dynamic(act);
		set_follow_playhead (tact->get_active());
	}
}

/** @param yn true to follow playhead, otherwise false.
 *  @param catch_up true to reset the editor view to show the playhead (if yn == true), otherwise false.
 */
void
Editor::set_follow_playhead (bool yn, bool catch_up)
{
	if (_follow_playhead != yn) {
		if ((_follow_playhead = yn) == true && catch_up) {
			/* catch up */
			reset_x_origin_to_follow_playhead ();
		}
		instant_save ();
	}
}

void
Editor::toggle_stationary_playhead ()
{
	RefPtr<Action> act = ActionManager::get_action (X_("Editor"), X_("toggle-stationary-playhead"));
	if (act) {
		RefPtr<ToggleAction> tact = RefPtr<ToggleAction>::cast_dynamic(act);
		set_stationary_playhead (tact->get_active());
	}
}

void
Editor::set_stationary_playhead (bool yn)
{
	if (_stationary_playhead != yn) {
		if ((_stationary_playhead = yn) == true) {
			/* catch up */
			// FIXME need a 3.0 equivalent of this 2.X call
			// update_current_screen ();
		}
		instant_save ();
	}
}

void
Editor::toggle_xfade_active (boost::weak_ptr<Crossfade> wxfade)
{
	boost::shared_ptr<Crossfade> xfade (wxfade.lock());
	if (xfade) {
		xfade->set_active (!xfade->active());
	}
}

void
Editor::toggle_xfade_length (boost::weak_ptr<Crossfade> wxfade)
{
	boost::shared_ptr<Crossfade> xfade (wxfade.lock());
	if (xfade) {
		xfade->set_follow_overlap (!xfade->following_overlap());
	}
}

void
Editor::edit_xfade (boost::weak_ptr<Crossfade> wxfade)
{
	boost::shared_ptr<Crossfade> xfade (wxfade.lock());

	if (!xfade) {
		return;
	}

	CrossfadeEditor cew (_session, xfade, xfade->fade_in().get_min_y(), 1.0);

	ensure_float (cew);

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

	cew.apply ();
	PropertyChange all_crossfade_properties;
	all_crossfade_properties.add (ARDOUR::Properties::active);
	all_crossfade_properties.add (ARDOUR::Properties::follow_overlap);
	xfade->PropertyChanged (all_crossfade_properties);
}

PlaylistSelector&
Editor::playlist_selector () const
{
	return *_playlist_selector;
}

Evoral::MusicalTime
Editor::get_grid_type_as_beats (bool& success, framepos_t position)
{
	success = true;

	switch (_snap_type) {
	case SnapToBeat:
		return 1.0;
		break;

	case SnapToBeatDiv32:
		return 1.0/32.0;
		break;
	case SnapToBeatDiv28:
		return 1.0/28.0;
		break;
	case SnapToBeatDiv24:
		return 1.0/24.0;
		break;
	case SnapToBeatDiv20:
		return 1.0/20.0;
		break;
	case SnapToBeatDiv16:
		return 1.0/16.0;
		break;
	case SnapToBeatDiv14:
		return 1.0/14.0;
		break;
	case SnapToBeatDiv12:
		return 1.0/12.0;
		break;
	case SnapToBeatDiv10:
		return 1.0/10.0;
		break;
	case SnapToBeatDiv8:
		return 1.0/8.0;
		break;
	case SnapToBeatDiv7:
		return 1.0/7.0;
		break;
	case SnapToBeatDiv6:
		return 1.0/6.0;
		break;
	case SnapToBeatDiv5:
		return 1.0/5.0;
		break;
	case SnapToBeatDiv4:
		return 1.0/4.0;
		break;
	case SnapToBeatDiv3:
		return 1.0/3.0;
		break;
	case SnapToBeatDiv2:
		return 1.0/2.0;
		break;

	case SnapToBar:
		if (_session) {
			return _session->tempo_map().meter_at (position).beats_per_bar();
		}
		break;

	case SnapToCDFrame:
	case SnapToTimecodeFrame:
	case SnapToTimecodeSeconds:
	case SnapToTimecodeMinutes:
	case SnapToSeconds:
	case SnapToMinutes:
	case SnapToRegionStart:
	case SnapToRegionEnd:
	case SnapToRegionSync:
	case SnapToRegionBoundary:
	default:
		success = false;
		break;
	}

	return 0.0;
}

framecnt_t
Editor::get_nudge_distance (framepos_t pos, framecnt_t& next)
{
	framecnt_t ret;

	ret = nudge_clock->current_duration (pos);
	next = ret + 1; /* XXXX fix me */

	return ret;
}

int
Editor::playlist_deletion_dialog (boost::shared_ptr<Playlist> pl)
{
	ArdourDialog dialog (_("Playlist Deletion"));
	Label  label (string_compose (_("Playlist %1 is currently unused.\n"
					"If it is kept, its audio files will not be cleaned.\n"
					"If it is deleted, audio files used by it alone will be cleaned."),
				      pl->name()));

	dialog.set_position (WIN_POS_CENTER);
	dialog.get_vbox()->pack_start (label);

	label.show ();

	dialog.add_button (_("Delete Playlist"), RESPONSE_ACCEPT);
	dialog.add_button (_("Keep Playlist"), RESPONSE_REJECT);
	dialog.add_button (_("Cancel"), RESPONSE_CANCEL);

	switch (dialog.run ()) {
	case RESPONSE_ACCEPT:
		/* delete the playlist */
		return 0;
		break;

	case RESPONSE_REJECT:
		/* keep the playlist */
		return 1;
		break;

	default:
		break;
	}

	return -1;
}

bool
Editor::audio_region_selection_covers (framepos_t where)
{
	for (RegionSelection::iterator a = selection->regions.begin(); a != selection->regions.end(); ++a) {
		if ((*a)->region()->covers (where)) {
			return true;
		}
	}

	return false;
}

void
Editor::prepare_for_cleanup ()
{
	cut_buffer->clear_regions ();
	cut_buffer->clear_playlists ();

	selection->clear_regions ();
	selection->clear_playlists ();

	_regions->suspend_redisplay ();
}

void
Editor::finish_cleanup ()
{
	_regions->resume_redisplay ();
}

Location*
Editor::transport_loop_location()
{
	if (_session) {
		return _session->locations()->auto_loop_location();
	} else {
		return 0;
	}
}

Location*
Editor::transport_punch_location()
{
	if (_session) {
		return _session->locations()->auto_punch_location();
	} else {
		return 0;
	}
}

bool
Editor::control_layout_scroll (GdkEventScroll* ev)
{
	if (Keyboard::some_magic_widget_has_focus()) {
		return false;
	}

	switch (ev->direction) {
	case GDK_SCROLL_UP:
		scroll_tracks_up_line ();
		return true;
		break;

	case GDK_SCROLL_DOWN:
		scroll_tracks_down_line ();
		return true;

	default:
		/* no left/right handling yet */
		break;
	}

	return false;
}

void
Editor::session_state_saved (string)
{
	update_title ();
	_snapshots->redisplay ();
}

void
Editor::maximise_editing_space ()
{
	_mouse_mode_tearoff->set_visible (false);
	_tools_tearoff->set_visible (false);
	_zoom_tearoff->set_visible (false);

	pre_maximal_horizontal_pane_position = edit_pane.get_position ();
	pre_maximal_vertical_pane_position = editor_summary_pane.get_position ();
	pre_maximal_editor_width = this->get_width ();
	pre_maximal_editor_height = this->get_height ();

	if (post_maximal_horizontal_pane_position == 0) {
		post_maximal_horizontal_pane_position = edit_pane.get_width();
	}

	if (post_maximal_vertical_pane_position == 0) {
		post_maximal_vertical_pane_position = editor_summary_pane.get_height();
	}

	fullscreen ();

	if (post_maximal_editor_width) {
		edit_pane.set_position (post_maximal_horizontal_pane_position -
			abs(post_maximal_editor_width - pre_maximal_editor_width));
	} else {
		edit_pane.set_position (post_maximal_horizontal_pane_position);
	}

	/* Hack: we must do this in an idle handler for it to work; see comment in
	   restore_editing_space()
	*/
	   
	Glib::signal_idle().connect (
		sigc::bind (
			sigc::mem_fun (*this, &Editor::idle_reset_vertical_pane_position),
			post_maximal_vertical_pane_position
			)
		);

	if (Config->get_keep_tearoffs()) {
		_mouse_mode_tearoff->set_visible (true);
		_tools_tearoff->set_visible (true);
		if (Config->get_show_zoom_tools ()) {
			_zoom_tearoff->set_visible (true);
		}
	}

}

bool
Editor::idle_reset_vertical_pane_position (int p)
{
	editor_summary_pane.set_position (p);
	return false;
}

void
Editor::restore_editing_space ()
{
	// user changed width/height of panes during fullscreen

	if (post_maximal_horizontal_pane_position != edit_pane.get_position()) {
		post_maximal_horizontal_pane_position = edit_pane.get_position();
	}

	if (post_maximal_vertical_pane_position != editor_summary_pane.get_position()) {
		post_maximal_vertical_pane_position = editor_summary_pane.get_position();
	}

	unfullscreen();

	_mouse_mode_tearoff->set_visible (true);
	_tools_tearoff->set_visible (true);
	if (Config->get_show_zoom_tools ()) {
		_zoom_tearoff->set_visible (true);
	}
	post_maximal_editor_width = this->get_width();
	post_maximal_editor_height = this->get_height();

	edit_pane.set_position (pre_maximal_horizontal_pane_position + abs(this->get_width() - pre_maximal_editor_width));

	/* This is a bit of a hack, but it seems that if you set the vertical pane position
	   here it gets reset to some wrong value after this method has finished.  Doing
	   the setup in an idle callback seems to work.
	*/
	Glib::signal_idle().connect (
		sigc::bind (
			sigc::mem_fun (*this, &Editor::idle_reset_vertical_pane_position),
			pre_maximal_vertical_pane_position
			)
		);
}

/**
 *  Make new playlists for a given track and also any others that belong
 *  to the same active route group with the `edit' property.
 *  @param v Track.
 */

void
Editor::new_playlists (TimeAxisView* v)
{
	begin_reversible_command (_("new playlists"));
	vector<boost::shared_ptr<ARDOUR::Playlist> > playlists;
	_session->playlists->get (playlists);
	mapover_tracks (sigc::bind (sigc::mem_fun (*this, &Editor::mapped_use_new_playlist), playlists), v, ARDOUR::Properties::edit.property_id);
	commit_reversible_command ();
}

/**
 *  Use a copy of the current playlist for a given track and also any others that belong
 *  to the same active route group with the `edit' property.
 *  @param v Track.
 */

void
Editor::copy_playlists (TimeAxisView* v)
{
	begin_reversible_command (_("copy playlists"));
	vector<boost::shared_ptr<ARDOUR::Playlist> > playlists;
	_session->playlists->get (playlists);
	mapover_tracks (sigc::bind (sigc::mem_fun (*this, &Editor::mapped_use_copy_playlist), playlists), v, ARDOUR::Properties::edit.property_id);
	commit_reversible_command ();
}

/** Clear the current playlist for a given track and also any others that belong
 *  to the same active route group with the `edit' property.
 *  @param v Track.
 */

void
Editor::clear_playlists (TimeAxisView* v)
{
	begin_reversible_command (_("clear playlists"));
	vector<boost::shared_ptr<ARDOUR::Playlist> > playlists;
	_session->playlists->get (playlists);
	mapover_tracks (sigc::mem_fun (*this, &Editor::mapped_clear_playlist), v, ARDOUR::Properties::edit.property_id);
	commit_reversible_command ();
}

void
Editor::mapped_use_new_playlist (RouteTimeAxisView& atv, uint32_t sz, vector<boost::shared_ptr<ARDOUR::Playlist> > const & playlists)
{
	atv.use_new_playlist (sz > 1 ? false : true, playlists);
}

void
Editor::mapped_use_copy_playlist (RouteTimeAxisView& atv, uint32_t sz, vector<boost::shared_ptr<ARDOUR::Playlist> > const & playlists)
{
	atv.use_copy_playlist (sz > 1 ? false : true, playlists);
}

void
Editor::mapped_clear_playlist (RouteTimeAxisView& atv, uint32_t /*sz*/)
{
	atv.clear_playlist ();
}

bool
Editor::on_key_press_event (GdkEventKey* ev)
{
	return key_press_focus_accelerator_handler (*this, ev);
}

bool
Editor::on_key_release_event (GdkEventKey* ev)
{
	return Gtk::Window::on_key_release_event (ev);
	// return key_press_focus_accelerator_handler (*this, ev);
}

/** Queue up a change to the viewport x origin.
 *  @param frame New x origin.
 */
void
Editor::reset_x_origin (framepos_t frame)
{
	queue_visual_change (frame);
}

void
Editor::reset_y_origin (double y)
{
	queue_visual_change_y (y);
}

void
Editor::reset_zoom (double fpu)
{
	queue_visual_change (fpu);
}

void
Editor::reposition_and_zoom (framepos_t frame, double fpu)
{
	reset_x_origin (frame);
	reset_zoom (fpu);

	if (!no_save_visual) {
		undo_visual_stack.push_back (current_visual_state(false));
	}
}

Editor::VisualState::VisualState ()
	: gui_state (new GUIObjectState)
{
}

Editor::VisualState::~VisualState ()
{
	delete gui_state;
}

Editor::VisualState*
Editor::current_visual_state (bool with_tracks)
{
	VisualState* vs = new VisualState;
	vs->y_position = vertical_adjustment.get_value();
	vs->frames_per_unit = frames_per_unit;
	vs->leftmost_frame = leftmost_frame;
	vs->zoom_focus = zoom_focus;

	if (with_tracks) {	
		*(vs->gui_state) = *ARDOUR_UI::instance()->gui_object_state;
	}

	return vs;
}

void
Editor::undo_visual_state ()
{
	if (undo_visual_stack.empty()) {
		return;
	}

	redo_visual_stack.push_back (current_visual_state());

	VisualState* vs = undo_visual_stack.back();
	undo_visual_stack.pop_back();
	use_visual_state (*vs);
}

void
Editor::redo_visual_state ()
{
	if (redo_visual_stack.empty()) {
		return;
	}

	undo_visual_stack.push_back (current_visual_state());

	VisualState* vs = redo_visual_stack.back();
	redo_visual_stack.pop_back();
	use_visual_state (*vs);
}

void
Editor::swap_visual_state ()
{
	if (undo_visual_stack.empty()) {
		redo_visual_state ();
	} else {
		undo_visual_state ();
	}
}

void
Editor::use_visual_state (VisualState& vs)
{
	no_save_visual = true;

	_routes->suspend_redisplay ();

	vertical_adjustment.set_value (vs.y_position);

	set_zoom_focus (vs.zoom_focus);
	reposition_and_zoom (vs.leftmost_frame, vs.frames_per_unit);
	
	*ARDOUR_UI::instance()->gui_object_state = *vs.gui_state;

	for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {	
		(*i)->reset_visual_state ();
	}

	_routes->update_visibility ();
	_routes->resume_redisplay ();

	no_save_visual = false;
}

void
Editor::set_frames_per_unit (double fpu)
{
	/* this is the core function that controls the zoom level of the canvas. it is called
	   whenever one or more calls are made to reset_zoom(). it executes in an idle handler.
	*/

	if (fpu == frames_per_unit) {
		return;
	}

	if (fpu < 2.0) {
		fpu = 2.0;
	}


	/* don't allow zooms that fit more than the maximum number
	   of frames into an 800 pixel wide space.
	*/

	if (max_framepos / fpu < 800.0) {
		return;
	}

	if (tempo_lines)
		tempo_lines->tempo_map_changed();

	frames_per_unit = fpu;
	post_zoom ();
}

void
Editor::post_zoom ()
{
	// convert fpu to frame count

	framepos_t frames = (framepos_t) floor (frames_per_unit * _canvas_width);

	if (frames_per_unit != zoom_range_clock->current_duration()) {
		zoom_range_clock->set (frames);
	}

	if (mouse_mode == MouseRange && selection->time.start () != selection->time.end_frame ()) {
		for (TrackViewList::iterator i = selection->tracks.begin(); i != selection->tracks.end(); ++i) {
			(*i)->reshow_selection (selection->time);
		}
	}

	ZoomChanged (); /* EMIT_SIGNAL */

	//reset_scrolling_region ();

	if (playhead_cursor) {
		playhead_cursor->set_position (playhead_cursor->current_frame);
	}

	refresh_location_display();
	_summary->set_overlays_dirty ();

	update_marker_labels ();

	instant_save ();
}

void
Editor::queue_visual_change (framepos_t where)
{
	pending_visual_change.add (VisualChange::TimeOrigin);
	pending_visual_change.time_origin = where;
	ensure_visual_change_idle_handler ();
}

void
Editor::queue_visual_change (double fpu)
{
	pending_visual_change.add (VisualChange::ZoomLevel);
	pending_visual_change.frames_per_unit = fpu;

	ensure_visual_change_idle_handler ();
}

void
Editor::queue_visual_change_y (double y)
{
	pending_visual_change.add (VisualChange::YOrigin);
	pending_visual_change.y_origin = y;

	ensure_visual_change_idle_handler ();
}

void
Editor::ensure_visual_change_idle_handler ()
{
	if (pending_visual_change.idle_handler_id < 0) {
		pending_visual_change.idle_handler_id = g_idle_add (_idle_visual_changer, this);
	}
}

int
Editor::_idle_visual_changer (void* arg)
{
	return static_cast<Editor*>(arg)->idle_visual_changer ();
}

int
Editor::idle_visual_changer ()
{
	VisualChange::Type p = pending_visual_change.pending;
	pending_visual_change.pending = (VisualChange::Type) 0;

	double const last_time_origin = horizontal_position ();

	if (p & VisualChange::TimeOrigin) {
		/* This is a bit of a hack, but set_frames_per_unit
		   below will (if called) end up with the
		   CrossfadeViews looking at Editor::leftmost_frame,
		   and if we're changing origin and zoom in the same
		   operation it will be the wrong value unless we
		   update it here.
		*/

		leftmost_frame = pending_visual_change.time_origin;
	}

	if (p & VisualChange::ZoomLevel) {
		set_frames_per_unit (pending_visual_change.frames_per_unit);

		compute_fixed_ruler_scale ();
		compute_current_bbt_points(pending_visual_change.time_origin, pending_visual_change.time_origin + current_page_frames());
		compute_bbt_ruler_scale (pending_visual_change.time_origin, pending_visual_change.time_origin + current_page_frames());
		update_tempo_based_rulers ();
	}
	if (p & VisualChange::TimeOrigin) {
		set_horizontal_position (pending_visual_change.time_origin / frames_per_unit);
	}
	if (p & VisualChange::YOrigin) {
		vertical_adjustment.set_value (pending_visual_change.y_origin);
	}

	if (last_time_origin == horizontal_position ()) {
		/* changed signal not emitted */
		update_fixed_rulers ();
		redisplay_tempo (true);
	}

	_summary->set_overlays_dirty ();

	pending_visual_change.idle_handler_id = -1;
	return 0; /* this is always a one-shot call */
}

struct EditorOrderTimeAxisSorter {
    bool operator() (const TimeAxisView* a, const TimeAxisView* b) const {
	    return a->order () < b->order ();
    }
};

void
Editor::sort_track_selection (TrackViewList* sel)
{
	EditorOrderTimeAxisSorter cmp;

	if (sel) {
		sel->sort (cmp);
	} else {
		selection->tracks.sort (cmp);
	}
}

framepos_t
Editor::get_preferred_edit_position (bool ignore_playhead)
{
	bool ignored;
	framepos_t where = 0;
	EditPoint ep = _edit_point;

	if (entered_marker) {
                DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("GPEP: use entered marker @ %1\n", entered_marker->position()));
		return entered_marker->position();
	}

	if (ignore_playhead && ep == EditAtPlayhead) {
		ep = EditAtSelectedMarker;
	}

	switch (ep) {
	case EditAtPlayhead:
		where = _session->audible_frame();
                DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("GPEP: use playhead @ %1\n", where));
		break;

	case EditAtSelectedMarker:
		if (!selection->markers.empty()) {
			bool is_start;
			Location* loc = find_location_from_marker (selection->markers.front(), is_start);
			if (loc) {
				if (is_start) {
					where =  loc->start();
				} else {
					where = loc->end();
				}
                                DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("GPEP: use selected marker @ %1\n", where));
				break;
			}
		}
		/* fallthru */

	default:
	case EditAtMouse:
		if (!mouse_frame (where, ignored)) {
			/* XXX not right but what can we do ? */
			return 0;
		}
		snap_to (where);
                DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("GPEP: use mouse @ %1\n", where));
		break;
	}

	return where;
}

void
Editor::set_loop_range (framepos_t start, framepos_t end, string cmd)
{
	if (!_session) return;

	begin_reversible_command (cmd);

	Location* tll;

	if ((tll = transport_loop_location()) == 0) {
		Location* loc = new Location (*_session, start, end, _("Loop"),  Location::IsAutoLoop);
		XMLNode &before = _session->locations()->get_state();
		_session->locations()->add (loc, true);
		_session->set_auto_loop_location (loc);
		XMLNode &after = _session->locations()->get_state();
		_session->add_command (new MementoCommand<Locations>(*(_session->locations()), &before, &after));
	} else {
		XMLNode &before = tll->get_state();
		tll->set_hidden (false, this);
		tll->set (start, end);
		XMLNode &after = tll->get_state();
		_session->add_command (new MementoCommand<Location>(*tll, &before, &after));
	}

	commit_reversible_command ();
}

void
Editor::set_punch_range (framepos_t start, framepos_t end, string cmd)
{
	if (!_session) return;

	begin_reversible_command (cmd);

	Location* tpl;

	if ((tpl = transport_punch_location()) == 0) {
		Location* loc = new Location (*_session, start, end, _("Loop"),  Location::IsAutoPunch);
		XMLNode &before = _session->locations()->get_state();
		_session->locations()->add (loc, true);
		_session->set_auto_loop_location (loc);
		XMLNode &after = _session->locations()->get_state();
		_session->add_command (new MementoCommand<Locations>(*(_session->locations()), &before, &after));
	}
	else {
		XMLNode &before = tpl->get_state();
		tpl->set_hidden (false, this);
		tpl->set (start, end);
		XMLNode &after = tpl->get_state();
		_session->add_command (new MementoCommand<Location>(*tpl, &before, &after));
	}

	commit_reversible_command ();
}

/** Find regions which exist at a given time, and optionally on a given list of tracks.
 *  @param rs List to which found regions are added.
 *  @param where Time to look at.
 *  @param ts Tracks to look on; if this is empty, all tracks are examined.
 */
void
Editor::get_regions_at (RegionSelection& rs, framepos_t where, const TrackViewList& ts) const
{
	const TrackViewList* tracks;

	if (ts.empty()) {
		tracks = &track_views;
	} else {
		tracks = &ts;
	}

	for (TrackViewList::const_iterator t = tracks->begin(); t != tracks->end(); ++t) {

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

		if (rtv) {
			boost::shared_ptr<Track> tr;
			boost::shared_ptr<Playlist> pl;

			if ((tr = rtv->track()) && ((pl = tr->playlist()))) {

				Playlist::RegionList* regions = pl->regions_at (
						(framepos_t) floor ( (double) where * tr->speed()));

				for (Playlist::RegionList::iterator i = regions->begin(); i != regions->end(); ++i) {
					RegionView* rv = rtv->view()->find_view (*i);
					if (rv) {
						rs.add (rv);
					}
				}

				delete regions;
			}
		}
	}
}

void
Editor::get_regions_after (RegionSelection& rs, framepos_t where, const TrackViewList& ts) const
{
	const TrackViewList* tracks;

	if (ts.empty()) {
		tracks = &track_views;
	} else {
		tracks = &ts;
	}

	for (TrackViewList::const_iterator t = tracks->begin(); t != tracks->end(); ++t) {
		RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*>(*t);
		if (rtv) {
			boost::shared_ptr<Track> tr;
			boost::shared_ptr<Playlist> pl;

			if ((tr = rtv->track()) && ((pl = tr->playlist()))) {

				Playlist::RegionList* regions = pl->regions_touched (
					(framepos_t) floor ( (double)where * tr->speed()), max_framepos);

				for (Playlist::RegionList::iterator i = regions->begin(); i != regions->end(); ++i) {

					RegionView* rv = rtv->view()->find_view (*i);

					if (rv) {
						rs.push_back (rv);
					}
				}

				delete regions;
			}
		}
	}
}

/** Start with regions that are selected.  Then add equivalent regions
 *  on tracks in the same active edit-enabled route group as any of
 *  the regions that we started with.
 */

RegionSelection
Editor::get_regions_from_selection ()
{
	return get_equivalent_regions (selection->regions, ARDOUR::Properties::edit.property_id);
}

/** Get regions using the following method:
 *
 *  Make an initial region list using the selected regions, unless
 *  the edit point is `mouse' and the mouse is over an unselected
 *  region.  In this case, start with just that region.
 *
 *  Then, make an initial track list of the tracks that these
 *  regions are on, and if the edit point is not `mouse', add the
 *  selected tracks.
 *
 *  Look at this track list and add any other tracks that are on the
 *  same active edit-enabled route group as one of the initial tracks.
 *
 *  Finally take the initial region list and add any regions that are
 *  under the edit point on one of the tracks on the track list to get
 *  the returned region list.
 *
 *  The rationale here is that the mouse edit point is special in that
 *  its position describes both a time and a track; the other edit
 *  modes only describe a time.  Hence if the edit point is `mouse' we
 *  ignore selected tracks, as we assume the user means something by
 *  pointing at a particular track.  Also in this case we take note of
 *  the region directly under the edit point, as there is always just one
 *  (rather than possibly several with non-mouse edit points).
 */

RegionSelection
Editor::get_regions_from_selection_and_edit_point ()
{
	RegionSelection regions;

	if (_edit_point == EditAtMouse && entered_regionview && !selection->regions.contains (entered_regionview)) {
		regions.add (entered_regionview);
	} else {
		regions = selection->regions;
	}

	TrackViewList tracks;

	if (_edit_point != EditAtMouse) {
		tracks = selection->tracks;
	}

	/* Add any other tracks that have regions that are in the same
	   edit-activated route group as one of our regions.
	 */
	for (RegionSelection::iterator i = regions.begin (); i != regions.end(); ++i) {

		RouteGroup* g = (*i)->get_time_axis_view().route_group ();

		if (g && g->is_active() && g->is_edit()) {
			tracks.add (axis_views_from_routes (g->route_list()));
		}
	}

	if (!tracks.empty()) {
		/* now find regions that are at the edit position on those tracks */
		framepos_t const where = get_preferred_edit_position ();
		get_regions_at (regions, where, tracks);
	}

	return regions;
}

/** Start with regions that are selected, or the entered regionview if none are selected.
 *  Then add equivalent regions on tracks in the same active edit-enabled route group as any
 *  of the regions that we started with.
 */

RegionSelection
Editor::get_regions_from_selection_and_entered ()
{
	RegionSelection regions = selection->regions;

	if (regions.empty() && entered_regionview) {
		regions.add (entered_regionview);
	}

	return get_equivalent_regions (regions, ARDOUR::Properties::edit.property_id);
}

void
Editor::get_regions_corresponding_to (boost::shared_ptr<Region> region, vector<RegionView*>& regions)
{
	for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {

		RouteTimeAxisView* tatv;

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

			boost::shared_ptr<Playlist> pl;
			vector<boost::shared_ptr<Region> > results;
			RegionView* marv;
			boost::shared_ptr<Track> tr;

			if ((tr = tatv->track()) == 0) {
				/* bus */
				continue;
			}

			if ((pl = (tr->playlist())) != 0) {
				pl->get_region_list_equivalent_regions (region, results);
			}

			for (vector<boost::shared_ptr<Region> >::iterator ir = results.begin(); ir != results.end(); ++ir) {
				if ((marv = tatv->view()->find_view (*ir)) != 0) {
					regions.push_back (marv);
				}
			}

		}
	}
}

void
Editor::show_rhythm_ferret ()
{
	if (rhythm_ferret == 0) {
		rhythm_ferret = new RhythmFerret(*this);
	}

	rhythm_ferret->set_session (_session);
	rhythm_ferret->show ();
	rhythm_ferret->present ();
}

void
Editor::first_idle ()
{
	MessageDialog* dialog = 0;

	if (track_views.size() > 1) {
		dialog = new MessageDialog (*this,
					    string_compose (_("Please wait while %1 loads visual data"), PROGRAM_NAME),
					    true,
					    Gtk::MESSAGE_INFO,
					    Gtk::BUTTONS_NONE);
		dialog->present ();
		ARDOUR_UI::instance()->flush_pending ();
	}

	for (TrackViewList::iterator t = track_views.begin(); t != track_views.end(); ++t) {
		(*t)->first_idle();
	}

	// first idle adds route children (automation tracks), so we need to redisplay here
	_routes->redisplay ();

	delete dialog;

	_have_idled = true;
}

gboolean
Editor::_idle_resize (gpointer arg)
{
	return ((Editor*)arg)->idle_resize ();
}

void
Editor::add_to_idle_resize (TimeAxisView* view, int32_t h)
{
	if (resize_idle_id < 0) {
		resize_idle_id = g_idle_add (_idle_resize, this);
		_pending_resize_amount = 0;
	}

	/* make a note of the smallest resulting height, so that we can clamp the
	   lower limit at TimeAxisView::hSmall */

	int32_t min_resulting = INT32_MAX;

	_pending_resize_amount += h;
	_pending_resize_view = view;

	min_resulting = min (min_resulting, int32_t (_pending_resize_view->current_height()) + _pending_resize_amount);

	if (selection->tracks.contains (_pending_resize_view)) {
		for (TrackViewList::iterator i = selection->tracks.begin(); i != selection->tracks.end(); ++i) {
			min_resulting = min (min_resulting, int32_t ((*i)->current_height()) + _pending_resize_amount);
		}
	}

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

	/* clamp */
	if (uint32_t (min_resulting) < TimeAxisView::preset_height (HeightSmall)) {
		_pending_resize_amount += TimeAxisView::preset_height (HeightSmall) - min_resulting;
	}
}

/** Handle pending resizing of tracks */
bool
Editor::idle_resize ()
{
	_pending_resize_view->idle_resize (_pending_resize_view->current_height() + _pending_resize_amount);

	if (dynamic_cast<AutomationTimeAxisView*> (_pending_resize_view) == 0 &&
	    selection->tracks.contains (_pending_resize_view)) {

		for (TrackViewList::iterator i = selection->tracks.begin(); i != selection->tracks.end(); ++i) {
			if (*i != _pending_resize_view) {
				(*i)->idle_resize ((*i)->current_height() + _pending_resize_amount);
			}
		}
	}

	_pending_resize_amount = 0;
	flush_canvas ();
	_group_tabs->set_dirty ();
	resize_idle_id = -1;

	return false;
}

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

	playhead_cursor->set_position (_session->audible_frame ());
	if (_follow_playhead && !_pending_initial_locate) {
		reset_x_origin_to_follow_playhead ();
	}

	_pending_locate_request = false;
	_pending_initial_locate = false;
}

void
Editor::region_view_added (RegionView *)
{
	_summary->set_dirty ();
}

void
Editor::region_view_removed ()
{
	_summary->set_dirty ();
}

TimeAxisView*
Editor::axis_view_from_route (boost::shared_ptr<Route> r) const
{
	TrackViewList::const_iterator j = track_views.begin ();
	while (j != track_views.end()) {
		RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*> (*j);
		if (rtv && rtv->route() == r) {
			return rtv;
		}
		++j;
	}

	return 0;
}


TrackViewList
Editor::axis_views_from_routes (boost::shared_ptr<RouteList> r) const
{
	TrackViewList t;

	for (RouteList::const_iterator i = r->begin(); i != r->end(); ++i) {
		TimeAxisView* tv = axis_view_from_route (*i);
		if (tv) {
			t.push_back (tv);
		}
	}

	return t;
}


void
Editor::handle_new_route (RouteList& routes)
{
	ENSURE_GUI_THREAD (*this, &Editor::handle_new_route, routes)

	RouteTimeAxisView *rtv;
	list<RouteTimeAxisView*> new_views;

	for (RouteList::iterator x = routes.begin(); x != routes.end(); ++x) {
		boost::shared_ptr<Route> route = (*x);

		if (route->is_hidden() || route->is_monitor()) {
			continue;
		}

		DataType dt = route->input()->default_type();

		if (dt == ARDOUR::DataType::AUDIO) {
			rtv = new AudioTimeAxisView (*this, _session, *track_canvas);
			rtv->set_route (route);
		} else if (dt == ARDOUR::DataType::MIDI) {
			rtv = new MidiTimeAxisView (*this, _session, *track_canvas);
			rtv->set_route (route);
		} else {
			throw unknown_type();
		}

		new_views.push_back (rtv);
		track_views.push_back (rtv);

		rtv->effective_gain_display ();

                if (internal_editing()) {
                        rtv->enter_internal_edit_mode ();
                } else {
                        rtv->leave_internal_edit_mode ();
                }

		rtv->view()->RegionViewAdded.connect (sigc::mem_fun (*this, &Editor::region_view_added));
		rtv->view()->RegionViewRemoved.connect (sigc::mem_fun (*this, &Editor::region_view_removed));
	}

	_routes->routes_added (new_views);
	_summary->routes_added (new_views);

	if (show_editor_mixer_when_tracks_arrive) {
		show_editor_mixer (true);
	}

	editor_list_button.set_sensitive (true);
}

void
Editor::timeaxisview_deleted (TimeAxisView *tv)
{
	if (_session && _session->deletion_in_progress()) {
		/* the situation is under control */
		return;
	}

	ENSURE_GUI_THREAD (*this, &Editor::timeaxisview_deleted, tv);

	RouteTimeAxisView* rtav = dynamic_cast<RouteTimeAxisView*> (tv);

	_routes->route_removed (tv);

	if (tv == entered_track) {
		entered_track = 0;
	}

	TimeAxisView::Children c = tv->get_child_list ();
	for (TimeAxisView::Children::const_iterator i = c.begin(); i != c.end(); ++i) {
		if (entered_track == i->get()) {
			entered_track = 0;
		}
	}

	/* remove it from the list of track views */

	TrackViewList::iterator i;

	if ((i = find (track_views.begin(), track_views.end(), tv)) != track_views.end()) {
		i = track_views.erase (i);
	}

	/* update whatever the current mixer strip is displaying, if revelant */

	boost::shared_ptr<Route> route;

	if (rtav) {
		route = rtav->route ();
	}

	if (current_mixer_strip && current_mixer_strip->route() == route) {

		TimeAxisView* next_tv;

		if (track_views.empty()) {
			next_tv = 0;
		} else if (i == track_views.end()) {
			next_tv = track_views.front();
		} else {
			next_tv = (*i);
		}


		if (next_tv) {
			set_selected_mixer_strip (*next_tv);
		} else {
			/* make the editor mixer strip go away setting the
			 * button to inactive (which also unticks the menu option)
			 */

			ActionManager::uncheck_toggleaction ("<Actions>/Editor/show-editor-mixer");
		}
	}
}

void
Editor::hide_track_in_display (TimeAxisView* tv, bool apply_to_selection)
{
	if (apply_to_selection) {
		for (TrackSelection::iterator i = selection->tracks.begin(); i != selection->tracks.end(); ) {

			TrackSelection::iterator j = i;
			++j;

			hide_track_in_display (*i, false);

			i = j;
		}
	} else {
		RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*> (tv);

		if (rtv && current_mixer_strip && (rtv->route() == current_mixer_strip->route())) {
			// this will hide the mixer strip
			set_selected_mixer_strip (*tv);
		}

		_routes->hide_track_in_display (*tv);
	}
}

bool
Editor::sync_track_view_list_and_routes ()
{
	track_views = TrackViewList (_routes->views ());

	_summary->set_dirty ();
	_group_tabs->set_dirty ();

	return false; // do not call again (until needed)
}

void
Editor::foreach_time_axis_view (sigc::slot<void,TimeAxisView&> theslot)
{
	for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
		theslot (**i);
	}
}

/** Find a RouteTimeAxisView by the ID of its route */
RouteTimeAxisView*
Editor::get_route_view_by_route_id (PBD::ID& id) const
{
	RouteTimeAxisView* v;

	for (TrackViewList::const_iterator i = track_views.begin(); i != track_views.end(); ++i) {
		if((v = dynamic_cast<RouteTimeAxisView*>(*i)) != 0) {
			if(v->route()->id() == id) {
				return v;
			}
		}
	}

	return 0;
}

void
Editor::fit_route_group (RouteGroup *g)
{
	TrackViewList ts = axis_views_from_routes (g->route_list ());
	fit_tracks (ts);
}

void
Editor::consider_auditioning (boost::shared_ptr<Region> region)
{
	boost::shared_ptr<AudioRegion> r = boost::dynamic_pointer_cast<AudioRegion> (region);

	if (r == 0) {
		_session->cancel_audition ();
		return;
	}

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

	_session->audition_region (r);
	last_audition_region = r;
}


void
Editor::hide_a_region (boost::shared_ptr<Region> r)
{
	r->set_hidden (true);
}

void
Editor::show_a_region (boost::shared_ptr<Region> r)
{
	r->set_hidden (false);
}

void
Editor::audition_region_from_region_list ()
{
	_regions->selection_mapover (sigc::mem_fun (*this, &Editor::consider_auditioning));
}

void
Editor::hide_region_from_region_list ()
{
	_regions->selection_mapover (sigc::mem_fun (*this, &Editor::hide_a_region));
}

void
Editor::show_region_in_region_list ()
{
	_regions->selection_mapover (sigc::mem_fun (*this, &Editor::show_a_region));
}

void
Editor::step_edit_status_change (bool yn)
{
	if (yn) {
		start_step_editing ();
	} else {
		stop_step_editing ();
	}
}

void
Editor::start_step_editing ()
{
	step_edit_connection = Glib::signal_timeout().connect (sigc::mem_fun (*this, &Editor::check_step_edit), 20);
}

void
Editor::stop_step_editing ()
{
	step_edit_connection.disconnect ();
}

bool
Editor::check_step_edit ()
{
	for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
		MidiTimeAxisView* mtv = dynamic_cast<MidiTimeAxisView*> (*i);
		if (mtv) {
			mtv->check_step_edit ();
		}
	}

	return true; // do it again, till we stop
}

bool
Editor::scroll_press (Direction dir)
{
	++_scroll_callbacks;

	if (_scroll_connection.connected() && _scroll_callbacks < 5) {
		/* delay the first auto-repeat */
		return true;
	}

	switch (dir) {
	case LEFT:
		scroll_backward (1);
		break;

	case RIGHT:
		scroll_forward (1);
		break;

	case UP:
		scroll_tracks_up_line ();
		break;

	case DOWN:
		scroll_tracks_down_line ();
		break;
	}

	/* do hacky auto-repeat */
	if (!_scroll_connection.connected ()) {

		_scroll_connection = Glib::signal_timeout().connect (
			sigc::bind (sigc::mem_fun (*this, &Editor::scroll_press), dir), 100
			);

		_scroll_callbacks = 0;
	}

	return true;
}

void
Editor::scroll_release ()
{
	_scroll_connection.disconnect ();
}

/** Queue a change for the Editor viewport x origin to follow the playhead */
void
Editor::reset_x_origin_to_follow_playhead ()
{
	framepos_t const frame = playhead_cursor->current_frame;

	if (frame < leftmost_frame || frame > leftmost_frame + current_page_frames()) {

		if (_session->transport_speed() < 0) {

			if (frame > (current_page_frames() / 2)) {
				center_screen (frame-(current_page_frames()/2));
			} else {
				center_screen (current_page_frames()/2);
			}

		} else {

			if (frame < leftmost_frame) {
				/* moving left */
				framepos_t l = 0;
				if (_session->transport_rolling()) {
					/* rolling; end up with the playhead at the right of the page */
					l = frame - current_page_frames ();
				} else {
					/* not rolling: end up with the playhead 3/4 of the way along the page */
					l = frame - (3 * current_page_frames() / 4);
				}

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

				center_screen_internal (l + (current_page_frames() / 2), current_page_frames ());
			} else {
				/* moving right */
				if (_session->transport_rolling()) {
					/* rolling: end up with the playhead on the left of the page */
					center_screen_internal (frame + (current_page_frames() / 2), current_page_frames ());
				} else {
					/* not rolling: end up with the playhead 1/4 of the way along the page */
					center_screen_internal (frame + (current_page_frames() / 4), current_page_frames ());
				}
			}
		}
	}
}

void
Editor::super_rapid_screen_update ()
{
	if (!_session || !_session->engine().running()) {
		return;
	}

	/* METERING / MIXER STRIPS */

	/* update track meters, if required */
	if (is_mapped() && meters_running) {
		RouteTimeAxisView* rtv;
		for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
			if ((rtv = dynamic_cast<RouteTimeAxisView*>(*i)) != 0) {
				rtv->fast_update ();
			}
		}
	}

	/* and any current mixer strip */
	if (current_mixer_strip) {
		current_mixer_strip->fast_update ();
	}

	/* PLAYHEAD AND VIEWPORT */

	framepos_t const frame = _session->audible_frame();

	/* There are a few reasons why we might not update the playhead / viewport stuff:
	 *
	 * 1.  we don't update things when there's a pending locate request, otherwise
	 *     when the editor requests a locate there is a chance that this method
	 *     will move the playhead before the locate request is processed, causing
	 *     a visual glitch.
	 * 2.  if we're not rolling, there's nothing to do here (locates are handled elsewhere).
	 * 3.  if we're still at the same frame that we were last time, there's nothing to do.
	 */

	if (!_pending_locate_request && _session->transport_speed() != 0 && frame != last_update_frame) {

		last_update_frame = frame;

		if (!_dragging_playhead) {
			playhead_cursor->set_position (frame);
		}

		if (!_stationary_playhead) {

			if (!_dragging_playhead && _follow_playhead && _session->requested_return_frame() < 0) {
				reset_x_origin_to_follow_playhead ();
			}

		} else {

			/* don't do continuous scroll till the new position is in the rightmost quarter of the
			   editor canvas
			*/
#if 0
			// FIXME DO SOMETHING THAT WORKS HERE - this is 2.X code
			double target = ((double)frame - (double)current_page_frames()/2.0) / frames_per_unit;
			if (target <= 0.0) {
				target = 0.0;
			}
			if (fabs(target - current) < current_page_frames() / frames_per_unit) {
				target = (target * 0.15) + (current * 0.85);
			} else {
				/* relax */
			}

			current = target;
			set_horizontal_position (current);
#endif
		}

	}
}


void
Editor::session_going_away ()
{
	_have_idled = false;

	_session_connections.drop_connections ();

	super_rapid_screen_update_connection.disconnect ();

	selection->clear ();
	cut_buffer->clear ();

	clicked_regionview = 0;
	clicked_axisview = 0;
	clicked_routeview = 0;
	clicked_crossfadeview = 0;
	entered_regionview = 0;
	entered_track = 0;
	last_update_frame = 0;
	_drags->abort ();

	playhead_cursor->canvas_item.hide ();

	/* rip everything out of the list displays */

	_regions->clear ();
	_routes->clear ();
	_route_groups->clear ();

	/* do this first so that deleting a track doesn't reset cms to null
	   and thus cause a leak.
	*/

	if (current_mixer_strip) {
		if (current_mixer_strip->get_parent() != 0) {
			global_hpacker.remove (*current_mixer_strip);
		}
		delete current_mixer_strip;
		current_mixer_strip = 0;
	}

	/* delete all trackviews */

	for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
		delete *i;
	}
	track_views.clear ();

	zoom_range_clock->set_session (0);
	nudge_clock->set_session (0);

	editor_list_button.set_active(false);
	editor_list_button.set_sensitive(false);

	/* clear tempo/meter rulers */
	remove_metric_marks ();
	hide_measures ();
	clear_marker_display ();

	delete current_bbt_points;
	current_bbt_points = 0;

	/* get rid of any existing editor mixer strip */

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

	set_title (title.get_string());

	SessionHandlePtr::session_going_away ();
}


void
Editor::show_editor_list (bool yn)
{
	if (yn) {
		_the_notebook.show ();
	} else {
		_the_notebook.hide ();
	}
}

void
Editor::change_region_layering_order ()
{
	framepos_t const position = get_preferred_edit_position ();

	if (!clicked_routeview) {
		if (layering_order_editor) {
			layering_order_editor->hide ();
		}
		return;
	}

	boost::shared_ptr<Track> track = boost::dynamic_pointer_cast<Track> (clicked_routeview->route());

	if (!track) {
		return;
	}

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

	if (!pl) {
		return;
	}

	if (layering_order_editor == 0) {
		layering_order_editor = new RegionLayeringOrderEditor(*this);
	}

	layering_order_editor->set_context (clicked_routeview->name(), _session, pl, position);
	layering_order_editor->maybe_present ();
}

void
Editor::update_region_layering_order_editor ()
{
	if (layering_order_editor && layering_order_editor->is_visible ()) {
		change_region_layering_order ();
	}
}

void
Editor::setup_fade_images ()
{
	_fade_in_images[FadeLinear] = new Gtk::Image (get_icon_path (X_("crossfade-in-linear")));
	_fade_in_images[FadeFast] = new Gtk::Image (get_icon_path (X_("crossfade-in-short-cut")));
	_fade_in_images[FadeLogB] = new Gtk::Image (get_icon_path (X_("crossfade-in-slow-cut")));
	_fade_in_images[FadeLogA] = new Gtk::Image (get_icon_path (X_("crossfade-in-fast-cut")));
	_fade_in_images[FadeSlow] = new Gtk::Image (get_icon_path (X_("crossfade-in-long-cut")));

	_fade_out_images[FadeLinear] = new Gtk::Image (get_icon_path (X_("crossfade-out-linear")));
	_fade_out_images[FadeFast] = new Gtk::Image (get_icon_path (X_("crossfade-out-short-cut")));
	_fade_out_images[FadeLogB] = new Gtk::Image (get_icon_path (X_("crossfade-out-slow-cut")));
	_fade_out_images[FadeLogA] = new Gtk::Image (get_icon_path (X_("crossfade-out-fast-cut")));
	_fade_out_images[FadeSlow] = new Gtk::Image (get_icon_path (X_("crossfade-out-long-cut")));
}


/** @return Gtk::manage()d menu item for a given action from `editor_actions' */
Gtk::MenuItem&
Editor::action_menu_item (std::string const & name)
{
	Glib::RefPtr<Action> a = editor_actions->get_action (name);
	assert (a);

	return *manage (a->create_menu_item ());
}

void
Editor::resize_text_widgets ()
{
        set_size_request_to_display_given_text (edit_mode_selector, edit_mode_strings, COMBO_FUDGE+10, 15);
        set_size_request_to_display_given_text (zoom_focus_selector, zoom_focus_strings, COMBO_FUDGE+10, 15);
        set_size_request_to_display_given_text (snap_type_selector, snap_type_strings, COMBO_FUDGE+10, 15);
        set_size_request_to_display_given_text (snap_mode_selector, snap_mode_strings, COMBO_FUDGE+10, 15);
        set_size_request_to_display_given_text (edit_point_selector, edit_point_strings, COMBO_FUDGE+10, 15);
}

void
Editor::add_notebook_page (string const & name, Gtk::Widget& widget)
{
	EventBox* b = manage (new EventBox);
	b->signal_button_press_event().connect (sigc::bind (sigc::mem_fun (*this, &Editor::notebook_tab_clicked), &widget));
	Label* l = manage (new Label (name));
	l->set_angle (-90);
	b->add (*l);
	b->show_all ();
	_the_notebook.append_page (widget, *b);
}

bool
Editor::notebook_tab_clicked (GdkEventButton* ev, Gtk::Widget* page)
{
	if (ev->type == GDK_BUTTON_PRESS || ev->type == GDK_2BUTTON_PRESS) {
		_the_notebook.set_current_page (_the_notebook.page_num (*page));
	}

	if (ev->type == GDK_2BUTTON_PRESS) {

		/* double-click on a notebook tab shrinks or expands the notebook */

		if (_notebook_shrunk) {
			edit_pane.set_position (pre_maximal_horizontal_pane_position);
			_notebook_shrunk = false;
		} else {
			pre_maximal_horizontal_pane_position = edit_pane.get_position ();
			edit_pane.set_position (edit_pane.get_position() + page->get_width());
			_notebook_shrunk = true;
		}
	}

	return true;
}

void
Editor::popup_control_point_context_menu (ArdourCanvas::Item* item, GdkEvent* event)
{
	using namespace Menu_Helpers;
	
	MenuList& items = _control_point_context_menu.items ();
	items.clear ();
	
	items.push_back (MenuElem (_("Edit..."), sigc::bind (sigc::mem_fun (*this, &Editor::edit_control_point), item)));
	items.push_back (MenuElem (_("Delete"), sigc::bind (sigc::mem_fun (*this, &Editor::remove_control_point), item)));
	if (!can_remove_control_point (item)) {
		items.back().set_sensitive (false);
	}

	_control_point_context_menu.popup (event->button.button, event->button.time);
}