Editor zooming: Initialize leftmost_frame, for sessions that start at high timecodes.
[ardour.git] / gtk2_ardour / editor.cc
index ba07222bdf8d694aaa0e4f9302a5e7dc7e01ebf3..d525761140384c43e4fa42f62ba05cf14d06d60e 100644 (file)
 #include <gtkmm/menuitem.h>
 
 #include "gtkmm2ext/bindings.h"
-#include "gtkmm2ext/grouped_buttons.h"
 #include "gtkmm2ext/gtk_ui.h"
-#include <gtkmm2ext/keyboard.h>
+#include "gtkmm2ext/keyboard.h"
 #include "gtkmm2ext/utils.h"
 #include "gtkmm2ext/window_title.h"
-#include "gtkmm2ext/choice.h"
 #include "gtkmm2ext/cell_renderer_pixbuf_toggle.h"
 
 #include "ardour/analysis_graph.h"
 #include "canvas/debug.h"
 #include "canvas/text.h"
 
+#include "widgets/ardour_spacer.h"
+#include "widgets/eventboxext.h"
+#include "widgets/tooltips.h"
+
 #include "control_protocol/control_protocol.h"
 
 #include "actions.h"
 #include "analysis_window.h"
-#include "ardour_spacer.h"
 #include "audio_clock.h"
 #include "audio_region_view.h"
 #include "audio_streamview.h"
@@ -97,6 +98,7 @@
 #include "crossfade_edit.h"
 #include "debug.h"
 #include "editing.h"
+#include "editing_convert.h"
 #include "editor.h"
 #include "editor_cursors.h"
 #include "editor_drag.h"
 #include "editor_routes.h"
 #include "editor_snapshots.h"
 #include "editor_summary.h"
+#include "enums_convert.h"
 #include "export_report.h"
 #include "global_port_matrix.h"
 #include "gui_object.h"
 #include "time_axis_view.h"
 #include "time_info_box.h"
 #include "timers.h"
-#include "tooltips.h"
 #include "ui_config.h"
 #include "utils.h"
 #include "vca_time_axis.h"
 
 using namespace std;
 using namespace ARDOUR;
+using namespace ArdourWidgets;
 using namespace ARDOUR_UI_UTILS;
 using namespace PBD;
 using namespace Gtk;
@@ -299,9 +302,11 @@ Editor::Editor ()
        , minsec_mark_interval (0)
        , minsec_mark_modulo (0)
        , minsec_nmarks (0)
+       , timecode_ruler_scale (timecode_show_many_hours)
        , timecode_mark_modulo (0)
        , timecode_nmarks (0)
        , _samples_ruler_interval (0)
+       , bbt_ruler_scale (bbt_show_many)
        , bbt_bars (0)
        , bbt_nmarks (0)
        , bbt_bar_helper_on (0)
@@ -342,11 +347,13 @@ Editor::Editor ()
        , _full_canvas_height (0)
        , edit_controls_left_menu (0)
        , edit_controls_right_menu (0)
-       , last_update_frame (0)
+       , visual_change_queued(false)
+       , _last_update_time (0)
+       , _err_screen_engine (0)
        , cut_buffer_start (0)
        , cut_buffer_length (0)
        , button_bindings (0)
-       , last_paste_pos (0)
+       , last_paste_pos (-1)
        , paste_count (0)
        , sfbrowser (0)
        , current_interthread_info (0)
@@ -386,8 +393,8 @@ Editor::Editor ()
        , _visible_track_count (-1)
        ,  toolbar_selection_clock_table (2,3)
        ,  automation_mode_button (_("mode"))
-       , selection (new Selection (this))
-       , cut_buffer (new Selection (this))
+       , selection (new Selection (this, true))
+       , cut_buffer (new Selection (this, false))
        , _selection_memento (new SelectionMemento())
        , _all_region_actions_sensitized (false)
        , _ignore_region_action (false)
@@ -487,7 +494,7 @@ Editor::Editor ()
        location_loop_color = UIConfiguration::instance().color ("location loop");
        location_punch_color = UIConfiguration::instance().color ("location punch");
 
-       timebar_height = std::max(12., ceil (15. * ARDOUR_UI::ui_scale));
+       timebar_height = std::max (12., ceil (15. * UIConfiguration::instance().get_ui_scale()));
 
        TimeAxisView::setup_sizes ();
        ArdourMarker::setup_sizes (timebar_height);
@@ -638,12 +645,14 @@ Editor::Editor ()
        bottom_hbox.set_border_width (2);
        bottom_hbox.set_spacing (3);
 
+       PresentationInfo::Change.connect (*this, MISSING_INVALIDATOR, boost::bind (&Editor::presentation_info_changed, this, _1), gui_context());
+
        _route_groups = new EditorRouteGroups (this);
        _routes = new EditorRoutes (this);
        _regions = new EditorRegions (this);
        _snapshots = new EditorSnapshots (this);
        _locations = new EditorLocations (this);
-       _time_info_box = new TimeInfoBox (true);
+       _time_info_box = new TimeInfoBox ("EditorTimeInfo", true);
 
        /* these are static location signals */
 
@@ -669,42 +678,29 @@ Editor::Editor ()
        /* Pick up some settings we need to cache, early */
 
        XMLNode* settings = ARDOUR_UI::instance()->editor_settings();
-       XMLProperty* prop;
 
-       if (settings && (prop = settings->property ("notebook-shrunk"))) {
-               _notebook_shrunk = string_is_affirmative (prop->value ());
+       if (settings) {
+               settings->get_property ("notebook-shrunk", _notebook_shrunk);
        }
 
        editor_summary_pane.set_check_divider_position (true);
        editor_summary_pane.add (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_arrow_left = manage (new Button);
+       summary_arrow_left->add (*manage (new Arrow (ARROW_LEFT, SHADOW_NONE)));
+       summary_arrow_left->signal_pressed().connect (sigc::hide_return (sigc::bind (sigc::mem_fun (*this, &Editor::scroll_press), LEFT)));
+       summary_arrow_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));
+       Button* summary_arrow_right = manage (new Button);
+       summary_arrow_right->add (*manage (new Arrow (ARROW_RIGHT, SHADOW_NONE)));
+       summary_arrow_right->signal_pressed().connect (sigc::hide_return (sigc::bind (sigc::mem_fun (*this, &Editor::scroll_press), RIGHT)));
+       summary_arrow_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));
+       summary_arrows_left->pack_start (*summary_arrow_left);
 
        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);
+       summary_arrows_right->pack_start (*summary_arrow_right);
 
        Frame* summary_frame = manage (new Frame);
        summary_frame->set_shadow_type (Gtk::SHADOW_ETCHED_IN);
@@ -733,25 +729,17 @@ Editor::Editor ()
        editor_summary_pane.set_drag_cursor (*_cursors->expand_up_down);
 
        float fract;
+       if (!settings || !settings->get_property ("edit-horizontal-pane-pos", fract) || fract > 1.0) {
+               /* initial allocation is 90% to canvas, 10% to notebook */
+               fract = 0.90;
+       }
+       edit_pane.set_divider (0, fract);
 
-       {
-               LocaleGuard lg;
-
-               if (!settings || ((prop = settings->property ("edit-horizontal-pane-pos")) == 0) || ((fract = atof (prop->value())) > 1.0)) {
-                       /* initial allocation is 90% to canvas, 10% to notebook */
-                       edit_pane.set_divider (0, 0.90);
-               } else {
-                       edit_pane.set_divider (0, fract);
-               }
-
-               if (!settings || ((prop = settings->property ("edit-vertical-pane-pos")) == 0) || ((fract = atof (prop->value())) > 1.0)) {
-                       /* initial allocation is 90% to canvas, 10% to summary */
-                       editor_summary_pane.set_divider (0, 0.90);
-               } else {
-
-                       editor_summary_pane.set_divider (0, fract);
-               }
+       if (!settings || !settings->get_property ("edit-vertical-pane-pos", fract) || fract > 1.0) {
+               /* initial allocation is 90% to canvas, 10% to summary */
+               fract = 0.90;
        }
+       editor_summary_pane.set_divider (0, fract);
 
        global_vpacker.set_spacing (2);
        global_vpacker.set_border_width (0);
@@ -762,11 +750,11 @@ Editor::Editor ()
        ebox->set_name("EditorWindow");
        ebox->add (toolbar_hbox);
 
-       Gtk::EventBox* epane_box = manage (new Gtk::EventBox);  //a themeable box
+       Gtk::EventBox* epane_box = manage (new EventBoxExt);  //a themeable box
        epane_box->set_name("EditorWindow");
        epane_box->add (edit_pane);
 
-       Gtk::EventBox* epane_box2 = manage (new Gtk::EventBox);  //a themeable box
+       Gtk::EventBox* epane_box2 = manage (new EventBoxExt);  //a themeable box
        epane_box2->set_name("EditorWindow");
        epane_box2->add (global_vpacker);
 
@@ -828,8 +816,6 @@ Editor::Editor ()
 
        BasicUI::AccessAction.connect (*this, invalidator (*this), boost::bind (&Editor::access_action, this, _1, _2), gui_context());
 
-       PresentationInfo::Change.connect (*this, invalidator (*this), boost::bind (&Editor::presentation_info_changed, this, _1), gui_context());
-
        /* handle escape */
 
        ARDOUR_UI::instance()->Escape.connect (*this, invalidator (*this), boost::bind (&Editor::escape, this), gui_context());
@@ -849,16 +835,16 @@ Editor::Editor ()
 
        _show_marker_lines = false;
 
-        /* Button bindings */
+       /* Button bindings */
 
        button_bindings = new Bindings ("editor-mouse");
 
        XMLNode* node = button_settings();
-        if (node) {
-                for (XMLNodeList::const_iterator i = node->children().begin(); i != node->children().end(); ++i) {
-                        button_bindings->load_operation (**i);
-                }
-        }
+       if (node) {
+               for (XMLNodeList::const_iterator i = node->children().begin(); i != node->children().end(); ++i) {
+                       button_bindings->load_operation (**i);
+               }
+       }
 
        constructed = true;
 
@@ -905,14 +891,6 @@ Editor::~Editor()
        }
 }
 
-void
-Editor::presentation_info_changed (PropertyChange const & what_changed)
-{
-       if (what_changed.contains (Properties::selected)) {
-               track_selection_changed ();
-       }
-}
-
 XMLNode*
 Editor::button_settings () const
 {
@@ -1048,7 +1026,7 @@ Editor::control_unselect ()
 void
 Editor::control_select (boost::shared_ptr<Stripable> s, Selection::Operation op)
 {
-       TimeAxisView* tav = axis_view_from_stripable (s);
+       TimeAxisView* tav = time_axis_view_from_stripable (s);
 
        if (tav) {
                switch (op) {
@@ -1154,7 +1132,7 @@ Editor::deferred_control_scroll (framepos_t /*target*/)
 }
 
 void
-Editor::access_action (std::string action_group, std::string action_item)
+Editor::access_action (const std::string& action_group, const std::string& action_item)
 {
        if (!_session) {
                return;
@@ -1170,6 +1148,12 @@ Editor::access_action (std::string action_group, std::string action_item)
        }
 }
 
+void
+Editor::set_toggleaction (const std::string& action_group, const std::string& action_item, bool s)
+{
+       ActionManager::set_toggleaction_state (action_group.c_str(), action_item.c_str(), s);
+}
+
 void
 Editor::on_realize ()
 {
@@ -1335,6 +1319,10 @@ Editor::set_session (Session *t)
                return;
        }
 
+       //initialize leftmost_frame to the extents of the session
+       //this prevents a bogus setting of leftmost = "0" if the summary view asks for the leftmost frame before the visible state has been loaded from instant.xml
+       leftmost_frame = session_gui_extents().first;
+       
        _playlist_selector->set_session (_session);
        nudge_clock->set_session (_session);
        _summary->set_session (_session);
@@ -1381,6 +1369,12 @@ Editor::set_session (Session *t)
        XMLNode* node = ARDOUR_UI::instance()->editor_settings();
        set_state (*node, Stateful::loading_state_version);
 
+       /* catch up on selection state, etc. */
+
+       PropertyChange sc;
+       sc.add (Properties::selected);
+       presentation_info_changed (sc);
+
        /* catch up with the playhead */
 
        _session->request_locate (playhead_cursor->current_frame ());
@@ -1396,6 +1390,7 @@ Editor::set_session (Session *t)
 
        _session->StepEditStatusChange.connect (_session_connections, invalidator (*this), boost::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->TransportLooped.connect (_session_connections, invalidator (*this), boost::bind (&Editor::transport_looped, this), gui_context());
        _session->PositionChanged.connect (_session_connections, invalidator (*this), boost::bind (&Editor::map_position_change, this, _1), gui_context());
        _session->vca_manager().VCAAdded.connect (_session_connections, invalidator (*this), boost::bind (&Editor::add_vcas, this, _1), gui_context());
        _session->RouteAdded.connect (_session_connections, invalidator (*this), boost::bind (&Editor::add_routes, this, _1), gui_context());
@@ -1440,25 +1435,6 @@ Editor::set_session (Session *t)
                break;
        }
 
-       /* catch up on selection of stripables (other selection state is lost
-        * when a session is closed
-        */
-
-       StripableList sl;
-       TrackViewList tl;
-       _session->get_stripables (sl);
-       for (StripableList::const_iterator s = sl.begin(); s != sl.end(); ++s) {
-               if ((*s)->presentation_info().selected()) {
-                       RouteTimeAxisView* rtav = get_route_view_by_route_id ((*s)->id());
-                       if (rtav) {
-                               tl.push_back (rtav);
-                       }
-               }
-       }
-       if (!tl.empty()) {
-               selection->set (tl);
-       }
-
        /* register for undo history */
        _session->register_with_memento_command_factory(id(), this);
        _session->register_with_memento_command_factory(_selection_memento->id(), _selection_memento);
@@ -1912,27 +1888,17 @@ Editor::add_region_context_items (Menu_Helpers::MenuList& edit_items, boost::sha
 
        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 = new MenuItem (menu_item_name, false);
                _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);
        }
 
-       /* No latering allowed in later is higher layering model */
+       /* No layering allowed in later is higher layering model */
        RefPtr<Action> act = ActionManager::get_action (X_("EditorMenu"), X_("RegionMenuLayering"));
        if (act && Config->get_layer_model() == LaterHigher) {
                act->set_sensitive (false);
@@ -2351,18 +2317,16 @@ Editor::set_edit_point_preference (EditPoint ep, bool force)
 int
 Editor::set_state (const XMLNode& node, int version)
 {
-       XMLProperty const * prop;
        set_id (node);
        PBD::Unwinder<bool> nsi (no_save_instant, true);
-       LocaleGuard lg;
+       bool yn;
 
        Tabbable::set_state (node, version);
 
-       if (_session && (prop = node.property ("playhead"))) {
-               framepos_t pos;
-               sscanf (prop->value().c_str(), "%" PRIi64, &pos);
-               if (pos >= 0) {
-                       playhead_cursor->set_position (pos);
+       framepos_t ph_pos;
+       if (_session && node.get_property ("playhead", ph_pos)) {
+               if (ph_pos >= 0) {
+                       playhead_cursor->set_position (ph_pos);
                } else {
                        warning << _("Playhead position stored with a negative value - ignored (use zero instead)") << endmsg;
                        playhead_cursor->set_position (0);
@@ -2371,86 +2335,70 @@ Editor::set_state (const XMLNode& node, int version)
                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));
-       }
+       node.get_property ("mixer-width", editor_mixer_strip_width);
 
-       if ((prop = node.property ("zoom-focus"))) {
-               zoom_focus_selection_done ((ZoomFocus) string_2_enum (prop->value(), zoom_focus));
-       } else {
-               zoom_focus_selection_done (zoom_focus);
-       }
+       node.get_property ("zoom-focus", zoom_focus);
+       zoom_focus_selection_done (zoom_focus);
 
-       if ((prop = node.property ("zoom"))) {
+       double z;
+       if (node.get_property ("zoom", z)) {
                /* older versions of ardour used floating point samples_per_pixel */
-               double f = PBD::atof (prop->value());
-               reset_zoom (llrintf (f));
+               reset_zoom (llrintf (z));
        } else {
                reset_zoom (samples_per_pixel);
        }
 
-       if ((prop = node.property ("visible-track-count"))) {
-               set_visible_track_count (PBD::atoi (prop->value()));
+       int32_t cnt;
+       if (node.get_property ("visible-track-count", cnt)) {
+               set_visible_track_count (cnt);
        }
 
-       if ((prop = node.property ("snap-to"))) {
-               snap_type_selection_done ((SnapType) string_2_enum (prop->value(), _snap_type));
-               set_snap_to ((SnapType) string_2_enum (prop->value(), _snap_type));
-       } else {
-               set_snap_to (_snap_type);
+       SnapType snap_type;
+       if (!node.get_property ("snap-to", snap_type)) {
+               snap_type = _snap_type;
        }
+       set_snap_to (snap_type);
 
-       if ((prop = node.property ("snap-mode"))) {
-               snap_mode_selection_done((SnapMode) string_2_enum (prop->value(), _snap_mode));
+       SnapMode sm;
+       if (node.get_property ("snap-mode", sm)) {
+               snap_mode_selection_done(sm);
                /* set text of Dropdown. in case _snap_mode == SnapOff (default)
                 * snap_mode_selection_done() will only mark an already active item as active
                 * which does not trigger set_text().
                 */
-               set_snap_mode ((SnapMode) string_2_enum (prop->value(), _snap_mode));
+               set_snap_mode (sm);
        } else {
                set_snap_mode (_snap_mode);
        }
 
-       if ((prop = node.property ("internal-snap-to"))) {
-               internal_snap_type = (SnapType) string_2_enum (prop->value(), internal_snap_type);
-       }
-
-       if ((prop = node.property ("internal-snap-mode"))) {
-               internal_snap_mode = (SnapMode) string_2_enum (prop->value(), internal_snap_mode);
-       }
-
-       if ((prop = node.property ("pre-internal-snap-to"))) {
-               pre_internal_snap_type = (SnapType) string_2_enum (prop->value(), pre_internal_snap_type);
-       }
-
-       if ((prop = node.property ("pre-internal-snap-mode"))) {
-               pre_internal_snap_mode = (SnapMode) string_2_enum (prop->value(), pre_internal_snap_mode);
-       }
+       node.get_property ("internal-snap-to", internal_snap_type);
+       node.get_property ("internal-snap-mode", internal_snap_mode);
+       node.get_property ("pre-internal-snap-to", pre_internal_snap_type);
+       node.get_property ("pre-internal-snap-mode", pre_internal_snap_mode);
 
-       if ((prop = node.property ("mouse-mode"))) {
-               MouseMode m = str2mousemode(prop->value());
+       std::string mm_str;
+       if (node.get_property ("mouse-mode", mm_str)) {
+               MouseMode m = str2mousemode(mm_str);
                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) {
-                       if (pos < 0) {
-                               pos = 0;
-                       }
-                       reset_x_origin (pos);
+       framepos_t lf_pos;
+       if (node.get_property ("left-frame", lf_pos)) {
+               if (lf_pos < 0) {
+                       lf_pos = 0;
                }
+               reset_x_origin (lf_pos);
        }
 
-       if ((prop = node.property ("y-origin")) != 0) {
-               reset_y_origin (atof (prop->value ()));
+       double y_origin;
+       if (node.get_property ("y-origin", y_origin)) {
+               reset_y_origin (y_origin);
        }
 
-       if ((prop = node.property ("join-object-range"))) {
+       if (node.get_property ("join-object-range", yn)) {
                RefPtr<Action> act = ActionManager::get_action (X_("MouseMode"), X_("set-mouse-mode-object-range"));
-               bool yn = string_is_affirmative (prop->value());
                if (act) {
                        RefPtr<ToggleAction> tact = RefPtr<ToggleAction>::cast_dynamic(act);
                        tact->set_active (!yn);
@@ -2459,39 +2407,34 @@ Editor::set_state (const XMLNode& node, int version)
                set_mouse_mode(mouse_mode, true);
        }
 
-       if ((prop = node.property ("edit-point"))) {
-               set_edit_point_preference ((EditPoint) string_2_enum (prop->value(), _edit_point), true);
+       EditPoint ep;
+       if (node.get_property ("edit-point", ep)) {
+               set_edit_point_preference (ep, true);
        } else {
                set_edit_point_preference (_edit_point);
        }
 
-       if ((prop = node.property ("show-measures"))) {
-               bool yn = string_is_affirmative (prop->value());
-               _show_measures = yn;
-       }
+       node.get_property ("show-measures", _show_measures);
 
-       if ((prop = node.property ("follow-playhead"))) {
-               bool yn = string_is_affirmative (prop->value());
+       if (node.get_property ("follow-playhead", yn)) {
                set_follow_playhead (yn);
        }
 
-       if ((prop = node.property ("stationary-playhead"))) {
-               bool yn = string_is_affirmative (prop->value());
+       if (node.get_property ("stationary-playhead", yn)) {
                set_stationary_playhead (yn);
        }
 
-       if ((prop = node.property ("region-list-sort-type"))) {
-               RegionListSortType st;
-               _regions->reset_sort_type ((RegionListSortType) string_2_enum (prop->value(), st), true);
+       RegionListSortType sort_type;
+       if (node.get_property ("region-list-sort-type", sort_type)) {
+               _regions->reset_sort_type (sort_type, true);
        }
 
-       if ((prop = node.property ("show-editor-mixer"))) {
+       if (node.get_property ("show-editor-mixer", yn)) {
 
                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 */
 
@@ -2499,13 +2442,12 @@ Editor::set_state (const XMLNode& node, int version)
                tact->set_active (yn);
        }
 
-       if ((prop = node.property ("show-editor-list"))) {
+       if (node.get_property ("show-editor-list", yn)) {
 
                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 */
 
@@ -2513,15 +2455,15 @@ Editor::set_state (const XMLNode& node, int version)
                tact->set_active (yn);
        }
 
-       if ((prop = node.property (X_("editor-list-page")))) {
-               _the_notebook.set_current_page (atoi (prop->value ()));
+       int32_t el_page;
+       if (node.get_property (X_("editor-list-page"), el_page)) {
+               _the_notebook.set_current_page (el_page);
        }
 
-       if ((prop = node.property (X_("show-marker-lines")))) {
+       if (node.get_property (X_("show-marker-lines"), yn)) {
                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);
@@ -2534,8 +2476,7 @@ Editor::set_state (const XMLNode& node, int version)
                _locations->set_state (**i);
        }
 
-       if ((prop = node.property ("maximised"))) {
-               bool yn = string_is_affirmative (prop->value());
+       if (node.get_property ("maximised", yn)) {
                Glib::RefPtr<Action> act = ActionManager::get_action (X_("Common"), X_("ToggleMaximalEditor"));
                assert (act);
                Glib::RefPtr<ToggleAction> tact = Glib::RefPtr<ToggleAction>::cast_dynamic(act);
@@ -2545,10 +2486,9 @@ Editor::set_state (const XMLNode& node, int version)
                }
        }
 
-       if ((prop = node.property ("nudge-clock-value"))) {
-               framepos_t f;
-               sscanf (prop->value().c_str(), "%" PRId64, &f);
-               nudge_clock->set (f);
+       framepos_t nudge_clock_value;
+       if (node.get_property ("nudge-clock-value", nudge_clock_value)) {
+               nudge_clock->set (nudge_clock_value);
        } else {
                nudge_clock->set_mode (AudioClock::Timecode);
                nudge_clock->set (_session->frame_rate() * 5, true);
@@ -2560,7 +2500,6 @@ Editor::set_state (const XMLNode& node, int version)
                 * those that are linked to a private variable may need changing
                 */
                RefPtr<Action> act;
-               bool yn;
 
                act = ActionManager::get_action (X_("Editor"), X_("ToggleMeasureVisibility"));
                if (act) {
@@ -2597,79 +2536,67 @@ XMLNode&
 Editor::get_state ()
 {
        XMLNode* node = new XMLNode (X_("Editor"));
-       char buf[32];
-       LocaleGuard lg;
 
-       id().print (buf, sizeof (buf));
-       node->add_property ("id", buf);
+       node->set_property ("id", id().to_s ());
 
        node->add_child_nocopy (Tabbable::get_state());
 
-       snprintf(buf,sizeof(buf), "%f", edit_pane.get_divider ());
-       node->add_property("edit-horizontal-pane-pos", string(buf));
-       node->add_property("notebook-shrunk", _notebook_shrunk ? "1" : "0");
-       snprintf(buf,sizeof(buf), "%f", editor_summary_pane.get_divider());
-       node->add_property("edit-vertical-pane-pos", string(buf));
+       node->set_property("edit-horizontal-pane-pos", edit_pane.get_divider ());
+       node->set_property("notebook-shrunk", _notebook_shrunk);
+       node->set_property("edit-vertical-pane-pos", editor_summary_pane.get_divider());
 
        maybe_add_mixer_strip_width (*node);
 
-       node->add_property ("zoom-focus", enum_2_string (zoom_focus));
-
-       snprintf (buf, sizeof(buf), "%" PRId64, samples_per_pixel);
-       node->add_property ("zoom", buf);
-       node->add_property ("snap-to", enum_2_string (_snap_type));
-       node->add_property ("snap-mode", enum_2_string (_snap_mode));
-       node->add_property ("internal-snap-to", enum_2_string (internal_snap_type));
-       node->add_property ("internal-snap-mode", enum_2_string (internal_snap_mode));
-       node->add_property ("pre-internal-snap-to", enum_2_string (pre_internal_snap_type));
-       node->add_property ("pre-internal-snap-mode", enum_2_string (pre_internal_snap_mode));
-       node->add_property ("edit-point", enum_2_string (_edit_point));
-       snprintf (buf, sizeof(buf), "%d", _visible_track_count);
-       node->add_property ("visible-track-count", buf);
-
-       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 ("maximised", _maximised ? "yes" : "no");
-       node->add_property ("follow-playhead", _follow_playhead ? "yes" : "no");
-       node->add_property ("stationary-playhead", _stationary_playhead ? "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 ("join-object-range", smart_mode_action->get_active () ? "yes" : "no");
+       node->set_property ("zoom-focus", zoom_focus);
+
+       node->set_property ("zoom", samples_per_pixel);
+       node->set_property ("snap-to", _snap_type);
+       node->set_property ("snap-mode", _snap_mode);
+       node->set_property ("internal-snap-to", internal_snap_type);
+       node->set_property ("internal-snap-mode", internal_snap_mode);
+       node->set_property ("pre-internal-snap-to", pre_internal_snap_type);
+       node->set_property ("pre-internal-snap-mode", pre_internal_snap_mode);
+       node->set_property ("edit-point", _edit_point);
+       node->set_property ("visible-track-count", _visible_track_count);
+
+       node->set_property ("playhead", playhead_cursor->current_frame ());
+       node->set_property ("left-frame", leftmost_frame);
+       node->set_property ("y-origin", vertical_adjustment.get_value ());
+
+       node->set_property ("show-measures", _show_measures);
+       node->set_property ("maximised", _maximised);
+       node->set_property ("follow-playhead", _follow_playhead);
+       node->set_property ("stationary-playhead", _stationary_playhead);
+       node->set_property ("region-list-sort-type", _regions->sort_type ());
+       node->set_property ("mouse-mode", mouse_mode);
+       node->set_property ("join-object-range", smart_mode_action->get_active ());
 
        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");
+               node->set_property (X_("show-editor-mixer"), tact->get_active());
        }
 
        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");
+               node->set_property (X_("show-editor-list"), tact->get_active());
        }
 
-       snprintf (buf, sizeof (buf), "%d", _the_notebook.get_current_page ());
-       node->add_property (X_("editor-list-page"), buf);
+       node->set_property (X_("editor-list-page"), _the_notebook.get_current_page ());
 
-        if (button_bindings) {
-                XMLNode* bb = new XMLNode (X_("Buttons"));
-                button_bindings->save (*bb);
-                node->add_child_nocopy (*bb);
-        }
+       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->set_property (X_("show-marker-lines"), _show_marker_lines);
 
        node->add_child_nocopy (selection->get_state ());
        node->add_child_nocopy (_regions->get_state ());
 
-       snprintf (buf, sizeof (buf), "%" PRId64, nudge_clock->current_duration());
-       node->add_property ("nudge-clock-value", buf);
+       node->set_property ("nudge-clock-value", nudge_clock->current_duration());
 
        node->add_child_nocopy (LuaInstance::instance()->get_action_state());
        node->add_child_nocopy (LuaInstance::instance()->get_hook_state());
@@ -3456,6 +3383,15 @@ Editor::map_transport_state ()
        update_loop_range_view ();
 }
 
+void
+Editor::transport_looped ()
+{
+       /* reset Playhead position interpolation.
+        * see Editor::super_rapid_screen_update
+        */
+       _last_update_time = 0;
+}
+
 /* UNDO/REDO */
 
 void
@@ -3888,11 +3824,21 @@ Editor::set_visible_track_count (int32_t n)
                str = s.str();
        } else if (_visible_track_count == 0) {
                uint32_t n = 0;
-               for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
+               for (TrackViewList::const_iterator i = track_views.begin(); i != track_views.end(); ++i) {
                        if ((*i)->marked_for_display()) {
                                ++n;
+                               TimeAxisView::Children cl ((*i)->get_child_list ());
+                               for (TimeAxisView::Children::const_iterator j = cl.begin(); j != cl.end(); ++j) {
+                                       if ((*j)->marked_for_display()) {
+                                               ++n;
+                                       }
+                               }
                        }
                }
+               if (n == 0) {
+                       visible_tracks_selector.set_text (X_("*"));
+                       return;
+               }
                h = trackviews_height() / n;
                str = _("All");
        } else {
@@ -4564,9 +4510,13 @@ Editor::set_samples_per_pixel (framecnt_t spp)
        }
 
        samples_per_pixel = spp;
+}
 
+void
+Editor::on_samples_per_pixel_changed ()
+{
        if (tempo_lines) {
-               tempo_lines->tempo_map_changed();
+               tempo_lines->tempo_map_changed(_session->tempo_map().music_origin());
        }
 
        bool const showing_time_selection = selection->time.length() > 0;
@@ -4607,13 +4557,7 @@ Editor::playhead_cursor_sample () const
 void
 Editor::queue_visual_videotimeline_update ()
 {
-       /* TODO:
-        * pending_visual_change.add (VisualChange::VideoTimeline);
-        * or maybe even more specific: which videotimeline-image
-        * currently it calls update_video_timeline() to update
-        * _all outdated_ images on the video-timeline.
-        * see 'exposeimg()' in video_image_frame.cc
-        */
+       pending_visual_change.add (VisualChange::VideoTimeline);
        ensure_visual_change_idle_handler ();
 }
 
@@ -4633,9 +4577,25 @@ Editor::_idle_visual_changer (void* arg)
        return static_cast<Editor*>(arg)->idle_visual_changer ();
 }
 
+void
+Editor::pre_render ()
+{
+       visual_change_queued = false;
+
+       if (pending_visual_change.pending != 0) {
+               ensure_visual_change_idle_handler();
+       }
+}
+
 int
 Editor::idle_visual_changer ()
 {
+       pending_visual_change.idle_handler_id = -1;
+
+       if (pending_visual_change.pending == 0) {
+               return 0;
+       }
+
        /* set_horizontal_position() below (and maybe other calls) call
           gtk_main_iteration(), so it's possible that a signal will be handled
           half-way through this method.  If this signal wants an
@@ -4646,7 +4606,10 @@ Editor::idle_visual_changer ()
           the last one.
        */
 
-       pending_visual_change.idle_handler_id = -1;
+       if (visual_change_queued) {
+               return 0;
+       }
+
        pending_visual_change.being_handled = true;
 
        VisualChange vc = pending_visual_change;
@@ -4657,40 +4620,63 @@ Editor::idle_visual_changer ()
 
        pending_visual_change.being_handled = false;
 
+       visual_change_queued = true;
+
        return 0; /* this is always a one-shot call */
 }
 
 void
 Editor::visual_changer (const VisualChange& vc)
 {
-       double const last_time_origin = horizontal_position ();
-
+       /**
+        * Changed first so the correct horizontal canvas position is calculated in
+        * Editor::set_horizontal_position
+        */
        if (vc.pending & VisualChange::ZoomLevel) {
                set_samples_per_pixel (vc.samples_per_pixel);
-
-               compute_fixed_ruler_scale ();
-
-               compute_bbt_ruler_scale (vc.time_origin, pending_visual_change.time_origin + current_page_samples());
-               update_tempo_based_rulers ();
-
-               update_video_timeline();
        }
 
        if (vc.pending & VisualChange::TimeOrigin) {
-               set_horizontal_position (vc.time_origin / samples_per_pixel);
+               double new_time_origin = sample_to_pixel_unrounded (vc.time_origin);
+               set_horizontal_position (new_time_origin);
        }
 
        if (vc.pending & VisualChange::YOrigin) {
                vertical_adjustment.set_value (vc.y_origin);
        }
 
-       if (last_time_origin == horizontal_position ()) {
-               /* changed signal not emitted */
-               update_fixed_rulers ();
-               redisplay_tempo (true);
+       /**
+        * Now the canvas is in the final state before render the canvas items that
+        * support the Item::prepare_for_render interface can calculate the correct
+        * item to visible canvas intersection.
+        */
+       if (vc.pending & VisualChange::ZoomLevel) {
+               on_samples_per_pixel_changed ();
+
+               compute_fixed_ruler_scale ();
+
+               compute_bbt_ruler_scale (vc.time_origin, pending_visual_change.time_origin + current_page_samples());
+               update_tempo_based_rulers ();
        }
 
        if (!(vc.pending & VisualChange::ZoomLevel)) {
+               /**
+                * If the canvas is not being zoomed then the canvas items will not change
+                * and cause Item::prepare_for_render to be called so do it here manually.
+                *
+                * Not ideal, but I can't think of a better solution atm.
+                */
+               _track_canvas->prepare_for_render();
+       }
+
+       // If we are only scrolling vertically there is no need to update these
+       if (vc.pending != VisualChange::YOrigin) {
+               update_fixed_rulers ();
+               redisplay_tempo (true);
+
+               /* video frames & position need to be updated for zoom, horiz-scroll
+                * and (explicitly) VisualChange::VideoTimeline.
+                */
                update_video_timeline();
        }
 
@@ -4726,11 +4712,11 @@ Editor::get_preferred_edit_position (EditIgnoreOption ignore, bool from_context_
        if (from_outside_canvas && (ep == EditAtMouse)) {
                ep = EditAtPlayhead;
        } else if (from_context_menu && (ep == EditAtMouse)) {
-               return  canvas_event_sample (&context_click_event, 0, 0);
+               return canvas_event_sample (&context_click_event, 0, 0);
        }
 
        if (entered_marker) {
-                DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("GPEP: use entered marker @ %1\n", entered_marker->position()));
+               DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("GPEP: use entered marker @ %1\n", entered_marker->position()));
                return entered_marker->position();
        }
 
@@ -4746,12 +4732,12 @@ Editor::get_preferred_edit_position (EditIgnoreOption ignore, bool from_context_
 
        switch (ep) {
        case EditAtPlayhead:
-               if (_dragging_playhead) {
+               if (_dragging_playhead && _control_scroll_target) {
                        where = *_control_scroll_target;
                } else {
                        where = _session->audible_frame();
                }
-                DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("GPEP: use playhead @ %1\n", where));
+               DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("GPEP: use playhead @ %1\n", where));
                break;
 
        case EditAtSelectedMarker:
@@ -4764,7 +4750,7 @@ Editor::get_preferred_edit_position (EditIgnoreOption ignore, bool from_context_
                                } else {
                                        where = loc->end();
                                }
-                                DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("GPEP: use selected marker @ %1\n", where));
+                               DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("GPEP: use selected marker @ %1\n", where));
                                break;
                        }
                }
@@ -4779,7 +4765,7 @@ Editor::get_preferred_edit_position (EditIgnoreOption ignore, bool from_context_
                snap_mf.frame = where;
                snap_to (snap_mf);
                where = snap_mf.frame;
-                DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("GPEP: use mouse @ %1\n", where));
+               DEBUG_TRACE (DEBUG::CutNPaste, string_compose ("GPEP: use mouse @ %1\n", where));
                break;
        }
 
@@ -5088,7 +5074,7 @@ Editor::get_regions_corresponding_to (boost::shared_ptr<Region> region, vector<R
 }
 
 RegionView*
-Editor::get_regionview_from_region (boost::shared_ptr<Region> region) const
+Editor::regionview_from_region (boost::shared_ptr<Region> region) const
 {
        for (TrackViewList::const_iterator i = track_views.begin(); i != track_views.end(); ++i) {
                RouteTimeAxisView* tatv;
@@ -5105,6 +5091,20 @@ Editor::get_regionview_from_region (boost::shared_ptr<Region> region) const
        return NULL;
 }
 
+RouteTimeAxisView*
+Editor::rtav_from_route (boost::shared_ptr<Route> route) const
+{
+       for (TrackViewList::const_iterator i = track_views.begin(); i != track_views.end(); ++i) {
+               RouteTimeAxisView* rtav;
+               if ((rtav = dynamic_cast<RouteTimeAxisView*> (*i)) != 0) {
+                       if (rtav->route() == route) {
+                               return rtav;
+                       }
+               }
+       }
+       return NULL;
+}
+
 void
 Editor::show_rhythm_ferret ()
 {
@@ -5136,6 +5136,17 @@ Editor::first_idle ()
                (*t)->first_idle();
        }
 
+       /* now that all regionviews should exist, setup region selection */
+
+       RegionSelection rs;
+
+       for (list<PBD::ID>::iterator pr = selection->regions.pending.begin (); pr != selection->regions.pending.end (); ++pr) {
+               /* this is cumulative: rs is NOT cleared each time */
+               get_regionviews_by_id (*pr, rs);
+       }
+
+       selection->set (rs);
+
        // first idle adds route children (automation tracks), so we need to redisplay here
        _routes->redisplay ();
 
@@ -5231,19 +5242,12 @@ Editor::located ()
 
        _pending_locate_request = false;
        _pending_initial_locate = false;
+       _last_update_time = 0;
 }
 
 void
 Editor::region_view_added (RegionView * rv)
 {
-       for (list<PBD::ID>::iterator pr = selection->regions.pending.begin (); pr != selection->regions.pending.end (); ++pr) {
-               if (rv->region ()->id () == (*pr)) {
-                       selection->add (rv);
-                       selection->regions.pending.erase (pr);
-                       break;
-               }
-       }
-
        MidiRegionView* mrv = dynamic_cast<MidiRegionView*> (rv);
        if (mrv) {
                list<pair<PBD::ID const, list<Evoral::event_id_t> > >::iterator rnote;
@@ -5265,8 +5269,8 @@ Editor::region_view_removed ()
        _summary->set_background_dirty ();
 }
 
-TimeAxisView*
-Editor::axis_view_from_stripable (boost::shared_ptr<Stripable> s) const
+AxisView*
+Editor::axis_view_by_stripable (boost::shared_ptr<Stripable> s) const
 {
        for (TrackViewList::const_iterator j = track_views.begin (); j != track_views.end(); ++j) {
                if ((*j)->stripable() == s) {
@@ -5277,6 +5281,25 @@ Editor::axis_view_from_stripable (boost::shared_ptr<Stripable> s) const
        return 0;
 }
 
+AxisView*
+Editor::axis_view_by_control (boost::shared_ptr<AutomationControl> c) const
+{
+       for (TrackViewList::const_iterator j = track_views.begin (); j != track_views.end(); ++j) {
+               if ((*j)->control() == c) {
+                       return *j;
+               }
+
+               TimeAxisView::Children kids = (*j)->get_child_list ();
+
+               for (TimeAxisView::Children::iterator k = kids.begin(); k != kids.end(); ++k) {
+                       if ((*k)->control() == c) {
+                               return (*k).get();
+                       }
+               }
+       }
+
+       return 0;
+}
 
 TrackViewList
 Editor::axis_views_from_routes (boost::shared_ptr<RouteList> r) const
@@ -5284,7 +5307,7 @@ 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_stripable (*i);
+               TimeAxisView* tv = time_axis_view_from_stripable (*i);
                if (tv) {
                        t.push_back (tv);
                }
@@ -5343,7 +5366,7 @@ Editor::add_stripables (StripableList& sl)
        TrackViewList new_selection;
        bool from_scratch = (track_views.size() == 0);
 
-       sl.sort (StripablePresentationInfoSorter());
+       sl.sort (Stripable::Sorter());
 
        for (StripableList::iterator s = sl.begin(); s != sl.end(); ++s) {
 
@@ -5393,8 +5416,7 @@ Editor::add_stripables (StripableList& sl)
         */
 
        if (!from_scratch && !new_selection.empty()) {
-               selection->tracks.clear();
-               selection->add (new_selection);
+               selection->set (new_selection);
                begin_selection_op_history();
        }
 
@@ -5484,6 +5506,9 @@ Editor::timeaxisview_deleted (TimeAxisView *tv)
 void
 Editor::hide_track_in_display (TimeAxisView* tv, bool apply_to_selection)
 {
+       if (!tv) {
+               return;
+       }
        if (apply_to_selection) {
                for (TrackSelection::iterator i = selection->tracks.begin(); i != selection->tracks.end(); ) {
 
@@ -5506,6 +5531,18 @@ Editor::hide_track_in_display (TimeAxisView* tv, bool apply_to_selection)
        }
 }
 
+void
+Editor::show_track_in_display (TimeAxisView* tv, bool move_into_view)
+{
+       if (!tv) {
+               return;
+       }
+       _routes->show_track_in_display (*tv);
+       if (move_into_view) {
+               ensure_time_axis_view_is_visible (*tv, false);
+       }
+}
+
 bool
 Editor::sync_track_view_list_and_routes ()
 {
@@ -5525,15 +5562,15 @@ Editor::foreach_time_axis_view (sigc::slot<void,TimeAxisView&> theslot)
        }
 }
 
-/** Find a RouteTimeAxisView by the ID of its route */
-RouteTimeAxisView*
-Editor::get_route_view_by_route_id (const PBD::ID& id) const
+/** Find a StripableTimeAxisView by the ID of its stripable */
+StripableTimeAxisView*
+Editor::get_stripable_time_axis_by_id (const PBD::ID& id) const
 {
-       RouteTimeAxisView* v;
+       StripableTimeAxisView* 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) {
+               if((v = dynamic_cast<StripableTimeAxisView*>(*i)) != 0) {
+                       if(v->stripable()->id() == id) {
                                return v;
                        }
                }
@@ -5758,8 +5795,6 @@ Editor::super_rapid_screen_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
@@ -5769,46 +5804,92 @@ Editor::super_rapid_screen_update ()
         * 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_rolling ()) {
+               _last_update_time = 0;
+               return;
+       }
 
-       if (!_pending_locate_request && _session->transport_speed() != 0 && frame != last_update_frame) {
+       if (_dragging_playhead) {
+               _last_update_time = 0;
+               return;
+       }
 
-               last_update_frame = frame;
+       bool latent_locate = false;
+       framepos_t frame = _session->audible_frame (&latent_locate);
+       const int64_t now = g_get_monotonic_time ();
+       double err = 0;
 
-               if (!_dragging_playhead) {
-                       playhead_cursor->set_position (frame);
-               }
+       if (_session->exporting ()) {
+               /* freewheel/export may be faster or slower than transport_speed() / SR.
+                * Also exporting multiple ranges locates/jumps without a _pending_locate_request.
+                */
+               _last_update_time = 0;
+       }
 
-               if (!_stationary_playhead) {
+       if (_last_update_time > 0) {
+               /* interpolate and smoothen playhead position */
+               const double ds =  (now - _last_update_time) * _session->transport_speed() * _session->nominal_frame_rate () * 1e-6;
+               framepos_t guess = playhead_cursor->current_frame () + rint (ds);
+               err = frame - guess;
 
-                       if (!_dragging_playhead && _follow_playhead && _session->requested_return_frame() < 0 && !pending_visual_change.being_handled) {
-                               /* We only do this if we aren't already
-                                  handling a visual change (ie if
-                                  pending_visual_change.being_handled is
-                                  false) so that these requests don't stack
-                                  up there are too many of them to handle in
-                                  time.
-                               */
-                               reset_x_origin_to_follow_playhead ();
-                       }
+               guess += err * .12 + _err_screen_engine; // time-constant based on 25fps (super_rapid_screen_update)
+               _err_screen_engine += .0144 * (err - _err_screen_engine); // tc^2
 
-               } else {
+#if 0 // DEBUG
+               printf ("eng: %ld  gui:%ld (%+6.1f)  diff: %6.1f (err: %7.2f)\n",
+                               frame, guess, ds,
+                               err, _err_screen_engine);
+#endif
 
-                       if (!_dragging_playhead && _follow_playhead && _session->requested_return_frame() < 0 && !pending_visual_change.being_handled) {
-                               framepos_t const frame = playhead_cursor->current_frame ();
-                               double target = ((double)frame - (double)current_page_samples()/2.0);
-                               if (target <= 0.0) {
-                                       target = 0.0;
-                               }
-                               // compare to EditorCursor::set_position()
-                               double const old_pos = sample_to_pixel_unrounded (leftmost_frame);
-                               double const new_pos = sample_to_pixel_unrounded (target);
-                               if (rint (new_pos) != rint (old_pos)) {
-                                       reset_x_origin (pixel_to_sample (floor (new_pos)));
-                               }
-                       }
+               frame = guess;
+       } else {
+               _err_screen_engine = 0;
+       }
 
-               }
+       if (err > 8192 || latent_locate) {
+               // in case of x-runs or freewheeling
+               _last_update_time = 0;
+               frame = _session->audible_frame ();
+       } else {
+               _last_update_time = now;
+       }
 
+       if (playhead_cursor->current_frame () == frame) {
+               return;
+       }
+
+       playhead_cursor->set_position (frame);
+
+       if (_session->requested_return_frame() >= 0) {
+               _last_update_time = 0;
+               return;
+       }
+
+       if (!_follow_playhead || pending_visual_change.being_handled) {
+               /* We only do this if we aren't already
+                * handling a visual change (ie if
+                * pending_visual_change.being_handled is
+                * false) so that these requests don't stack
+                * up there are too many of them to handle in
+                * time.
+                */
+               return;
+       }
+
+       if (!_stationary_playhead) {
+               reset_x_origin_to_follow_playhead ();
+       } else {
+               framepos_t const frame = playhead_cursor->current_frame ();
+               double target = ((double)frame - (double)current_page_samples() / 2.0);
+               if (target <= 0.0) {
+                       target = 0.0;
+               }
+               // compare to EditorCursor::set_position()
+               double const old_pos = sample_to_pixel_unrounded (leftmost_frame);
+               double const new_pos = sample_to_pixel_unrounded (target);
+               if (rint (new_pos) != rint (old_pos)) {
+                       reset_x_origin (pixel_to_sample (new_pos));
+               }
        }
 }
 
@@ -5830,7 +5911,7 @@ Editor::session_going_away ()
        clicked_routeview = 0;
        entered_regionview = 0;
        entered_track = 0;
-       last_update_frame = 0;
+       _last_update_time = 0;
        _drags->abort ();
 
        playhead_cursor->hide ();
@@ -5870,6 +5951,9 @@ Editor::session_going_away ()
        hide_measures ();
        clear_marker_display ();
 
+       delete tempo_lines;
+       tempo_lines = 0;
+
        stop_step_editing ();
 
        if (own_window()) {