merge with master
[ardour.git] / gtk2_ardour / editor_canvas.cc
index e66ca1ef220151dd28be9ae9f9ff235af2188ce6..96236c3138e9e32d2fd7b04bf967c0611a0d0c46 100644 (file)
 #include "gtk2ardour-config.h"
 #endif
 
-#include <libgnomecanvasmm/init.h>
-#include <libgnomecanvasmm/pixbuf.h>
 #include <jack/types.h>
 
 #include "gtkmm2ext/utils.h"
 
 #include "ardour/profile.h"
 #include "ardour/rc_configuration.h"
+#include "ardour/smf_source.h"
+
+#include "canvas/canvas.h"
+#include "canvas/rectangle.h"
+#include "canvas/pixbuf.h"
+#include "canvas/text.h"
+#include "canvas/debug.h"
 
 #include "ardour_ui.h"
 #include "editor.h"
 #include "global_signals.h"
-#include "waveview.h"
-#include "simplerect.h"
-#include "simpleline.h"
-#include "imageframe.h"
-#include "waveview_p.h"
-#include "simplerect_p.h"
-#include "simpleline_p.h"
-#include "imageframe_p.h"
-#include "canvas_impl.h"
-#include "canvas-noevent-text.h"
 #include "editing.h"
 #include "rgb_macros.h"
 #include "utils.h"
@@ -71,63 +66,22 @@ using namespace Editing;
 
 const double max_canvas_coordinate = (double) JACK_MAX_FRAMES;
 
-extern "C"
-{
-
-GType gnome_canvas_simpleline_get_type(void);
-GType gnome_canvas_simplerect_get_type(void);
-GType gnome_canvas_waveview_get_type(void);
-GType gnome_canvas_imageframe_get_type(void);
-
-}
-
-static void ardour_canvas_type_init()
-{
-       // Map gtypes to gtkmm wrapper-creation functions:
-
-       Glib::wrap_register(gnome_canvas_simpleline_get_type(), &Gnome::Canvas::SimpleLine_Class::wrap_new);
-       Glib::wrap_register(gnome_canvas_simplerect_get_type(), &Gnome::Canvas::SimpleRect_Class::wrap_new);
-       Glib::wrap_register(gnome_canvas_waveview_get_type(), &Gnome::Canvas::WaveView_Class::wrap_new);
-       // Glib::wrap_register(gnome_canvas_imageframe_get_type(), &Gnome::Canvas::ImageFrame_Class::wrap_new);
-
-       // Register the gtkmm gtypes:
-
-       (void) Gnome::Canvas::WaveView::get_type();
-       (void) Gnome::Canvas::SimpleLine::get_type();
-       (void) Gnome::Canvas::SimpleRect::get_type();
-       (void) Gnome::Canvas::ImageFrame::get_type();
-}
-
 void
 Editor::initialize_canvas ()
 {
-       if (getenv ("ARDOUR_NON_AA_CANVAS")) {
-               track_canvas = new ArdourCanvas::Canvas ();
-       } else {
-               track_canvas = new ArdourCanvas::CanvasAA ();
-       }
-
-       track_canvas->set_can_default (true);
-       set_default (*track_canvas);
-
-       ArdourCanvas::init ();
-       ardour_canvas_type_init ();
-
-       /* don't try to center the canvas */
-
-       track_canvas->set_center_scroll_region (false);
-       track_canvas->set_dither (Gdk::RGB_DITHER_NONE);
-
-        gint phys_width = physical_screen_width (Glib::RefPtr<Gdk::Window>());
-        gint phys_height = physical_screen_height (Glib::RefPtr<Gdk::Window>());
+       _track_canvas_viewport = new ArdourCanvas::GtkCanvasViewport (horizontal_adjustment, vertical_adjustment);
+       _track_canvas = _track_canvas_viewport->canvas ();
 
+       _time_bars_canvas_viewport = new ArdourCanvas::GtkCanvasViewport (horizontal_adjustment, unused_adjustment);
+       _time_bars_canvas = _time_bars_canvas_viewport->canvas ();
+       
        _verbose_cursor = new VerboseCursor (this);
 
        /* on the bottom, an image */
 
        if (Profile->get_sae()) {
                Image img (::get_icon (X_("saelogo")));
-               logo_item = new ArdourCanvas::Pixbuf (*track_canvas->root(), 0.0, 0.0, img.get_pixbuf());
+               // logo_item = new ArdourCanvas::Pixbuf (_track_canvas->root(), 0.0, 0.0, img.get_pixbuf());
                // logo_item->property_height_in_pixels() = true;
                // logo_item->property_width_in_pixels() = true;
                // logo_item->property_height_set() = true;
@@ -136,132 +90,105 @@ Editor::initialize_canvas ()
        }
 
        /* a group to hold time (measure) lines */
-       time_line_group = new ArdourCanvas::Group (*track_canvas->root());
+       time_line_group = new ArdourCanvas::Group (_track_canvas->root());
 
-#ifdef GTKOSX
-       /*XXX please don't laugh. this actually improves canvas performance on osx */
-       bogus_background_rect =  new ArdourCanvas::SimpleRect (*time_line_group, 0.0, 0.0, max_canvas_coordinate/3, phys_height);
-       bogus_background_rect->property_outline_pixels() = 0;
-#endif
-       transport_loop_range_rect = new ArdourCanvas::SimpleRect (*time_line_group, 0.0, 0.0, 0.0, phys_height);
-       transport_loop_range_rect->property_outline_pixels() = 1;
+        transport_loop_range_rect = new ArdourCanvas::Rectangle (time_line_group, ArdourCanvas::Rect (0.0, 0.0, 0.0, ArdourCanvas::COORD_MAX));
        transport_loop_range_rect->hide();
 
-       transport_punch_range_rect = new ArdourCanvas::SimpleRect (*time_line_group, 0.0, 0.0, 0.0, phys_height);
-       transport_punch_range_rect->property_outline_pixels() = 0;
+       transport_punch_range_rect = new ArdourCanvas::Rectangle (time_line_group, ArdourCanvas::Rect (0.0, 0.0, 0.0, ArdourCanvas::COORD_MAX));
        transport_punch_range_rect->hide();
 
-       _background_group = new ArdourCanvas::Group (*track_canvas->root());
-       _master_group = new ArdourCanvas::Group (*track_canvas->root());
-
-       _trackview_group = new ArdourCanvas::Group (*_master_group);
-       _region_motion_group = new ArdourCanvas::Group (*_trackview_group);
-
-       meter_bar_group = new ArdourCanvas::Group (*track_canvas->root ());
-       meter_bar = new ArdourCanvas::SimpleRect (*meter_bar_group, 0.0, 0.0, phys_width, timebar_height - 1);
-       meter_bar->property_outline_pixels() = 1;
-       meter_bar->property_outline_what() = 0x8;
-
-       tempo_bar_group = new ArdourCanvas::Group (*track_canvas->root ());
-       tempo_bar = new ArdourCanvas::SimpleRect (*tempo_bar_group, 0.0, 0.0, phys_width, (timebar_height - 1));
-       tempo_bar->property_outline_pixels() = 1;
-       tempo_bar->property_outline_what() = 0x8;
-
-       range_marker_bar_group = new ArdourCanvas::Group (*track_canvas->root ());
-       range_marker_bar = new ArdourCanvas::SimpleRect (*range_marker_bar_group, 0.0, 0.0, phys_width, (timebar_height - 1));
-       range_marker_bar->property_outline_pixels() = 1;
-       range_marker_bar->property_outline_what() = 0x8;
-
-       transport_marker_bar_group = new ArdourCanvas::Group (*track_canvas->root ());
-       transport_marker_bar = new ArdourCanvas::SimpleRect (*transport_marker_bar_group, 0.0, 0.0,  phys_width, (timebar_height - 1));
-       transport_marker_bar->property_outline_pixels() = 1;
-       transport_marker_bar->property_outline_what() = 0x8;
-
-       marker_bar_group = new ArdourCanvas::Group (*track_canvas->root ());
-       marker_bar = new ArdourCanvas::SimpleRect (*marker_bar_group, 0.0, 0.0, phys_width, (timebar_height - 1));
-       marker_bar->property_outline_pixels() = 1;
-       marker_bar->property_outline_what() = 0x8;
-
-       cd_marker_bar_group = new ArdourCanvas::Group (*track_canvas->root ());
-       cd_marker_bar = new ArdourCanvas::SimpleRect (*cd_marker_bar_group, 0.0, 0.0, phys_width, (timebar_height - 1));
-       cd_marker_bar->property_outline_pixels() = 1;
-       cd_marker_bar->property_outline_what() = 0x8;
-
-#ifdef WITH_VIDEOTIMELINE
-       videotl_bar_group = new ArdourCanvas::Group (*track_canvas->root ());
-       if (Profile->get_sae()) {
-               videotl_bar = new ArdourCanvas::SimpleRect (*videotl_bar_group, 0.0, 0.0, phys_width, (timebar_height * videotl_bar_height - 1));
-               videotl_bar->property_outline_pixels() = 1;
-       } else {
-               videotl_bar = new ArdourCanvas::SimpleRect (*videotl_bar_group, 0.0, 0.0, phys_width, (timebar_height * videotl_bar_height));
-               videotl_bar->property_outline_pixels() = 0;
-       }
-       videotl_bar->property_outline_what() = (0x1 | 0x8);
-       ARDOUR_UI::instance()->video_timeline = new VideoTimeLine(this, videotl_bar_group, (timebar_height * videotl_bar_height));
-#endif
-
-       timebar_group =  new ArdourCanvas::Group (*track_canvas->root(), 0.0, 0.0);
-       cursor_group = new ArdourCanvas::Group (*track_canvas->root(), 0.0, 0.0);
-
-       meter_group = new ArdourCanvas::Group (*timebar_group, 0.0, timebar_height * 5.0);
-       tempo_group = new ArdourCanvas::Group (*timebar_group, 0.0, timebar_height * 4.0);
-       range_marker_group = new ArdourCanvas::Group (*timebar_group, 0.0, timebar_height * 3.0);
-       transport_marker_group = new ArdourCanvas::Group (*timebar_group, 0.0, timebar_height * 2.0);
-       marker_group = new ArdourCanvas::Group (*timebar_group, 0.0, timebar_height);
-       cd_marker_group = new ArdourCanvas::Group (*timebar_group, 0.0, 0.0);
-#ifdef WITH_VIDEOTIMELINE
-       videotl_group = new ArdourCanvas::Group (*timebar_group, 0.0, 0.0);
-#endif
-
-       cd_marker_bar_drag_rect = new ArdourCanvas::SimpleRect (*cd_marker_group, 0.0, 0.0, 100, timebar_height);
-       cd_marker_bar_drag_rect->property_outline_pixels() = 0;
+       _trackview_group = new ArdourCanvas::Group (_track_canvas->root());
+       CANVAS_DEBUG_NAME (_trackview_group, "Canvas TrackViews");
+       _region_motion_group = new ArdourCanvas::Group (_trackview_group);
+       CANVAS_DEBUG_NAME (_region_motion_group, "Canvas Region Motion");
+
+       meter_bar_group = new ArdourCanvas::Group (_time_bars_canvas->root ());
+       meter_bar = new ArdourCanvas::Rectangle (meter_bar_group, ArdourCanvas::Rect (0.0, 0.0, ArdourCanvas::COORD_MAX, timebar_height - 1));
+       CANVAS_DEBUG_NAME (meter_bar, "meter Bar");
+       meter_bar->set_outline_what (0x8);
+
+       tempo_bar_group = new ArdourCanvas::Group (_time_bars_canvas->root ());
+       tempo_bar = new ArdourCanvas::Rectangle (tempo_bar_group, ArdourCanvas::Rect (0.0, 0.0, ArdourCanvas::COORD_MAX, timebar_height - 1));
+       CANVAS_DEBUG_NAME (tempo_bar, "Tempo  Bar");
+       tempo_bar->set_outline_what (0x8);
+
+       range_marker_bar_group = new ArdourCanvas::Group (_time_bars_canvas->root ());
+       range_marker_bar = new ArdourCanvas::Rectangle (range_marker_bar_group, ArdourCanvas::Rect (0.0, 0.0, ArdourCanvas::COORD_MAX, timebar_height - 1));
+       CANVAS_DEBUG_NAME (range_marker_bar, "Range Marker Bar");
+       range_marker_bar->set_outline_what (0x8);
+
+       transport_marker_bar_group = new ArdourCanvas::Group (_time_bars_canvas->root ());
+       transport_marker_bar = new ArdourCanvas::Rectangle (transport_marker_bar_group, ArdourCanvas::Rect (0.0, 0.0, ArdourCanvas::COORD_MAX, timebar_height - 1));
+       CANVAS_DEBUG_NAME (transport_marker_bar, "transport Marker Bar");
+       transport_marker_bar->set_outline_what (0x8);
+
+       marker_bar_group = new ArdourCanvas::Group (_time_bars_canvas->root ());
+       marker_bar = new ArdourCanvas::Rectangle (marker_bar_group, ArdourCanvas::Rect (0.0, 0.0, ArdourCanvas::COORD_MAX, timebar_height - 1));
+       CANVAS_DEBUG_NAME (marker_bar, "Marker Bar");
+       marker_bar->set_outline_what (0x8);
+
+       cd_marker_bar_group = new ArdourCanvas::Group (_time_bars_canvas->root ());
+       cd_marker_bar = new ArdourCanvas::Rectangle (cd_marker_bar_group, ArdourCanvas::Rect (0.0, 0.0, ArdourCanvas::COORD_MAX, timebar_height - 1));
+       CANVAS_DEBUG_NAME (cd_marker_bar, "CD Marker Bar");
+       cd_marker_bar->set_outline_what (0x8);
+
+       _time_markers_group = new ArdourCanvas::Group (_time_bars_canvas->root());
+
+       meter_group = new ArdourCanvas::Group (_time_markers_group, ArdourCanvas::Duple (0.0, timebar_height * 5.0));
+       tempo_group = new ArdourCanvas::Group (_time_markers_group, ArdourCanvas::Duple (0.0, timebar_height * 4.0));
+       range_marker_group = new ArdourCanvas::Group (_time_markers_group, ArdourCanvas::Duple (0.0, timebar_height * 3.0));
+       transport_marker_group = new ArdourCanvas::Group (_time_markers_group, ArdourCanvas::Duple (0.0, timebar_height * 2.0));
+       marker_group = new ArdourCanvas::Group (_time_markers_group, ArdourCanvas::Duple (0.0, timebar_height));
+       cd_marker_group = new ArdourCanvas::Group (_time_markers_group, ArdourCanvas::Duple (0.0, 0.0));
+       videotl_group = new ArdourCanvas::Group (_time_markers_group, ArdourCanvas::Duple(0.0, 0.0));
+
+       ARDOUR_UI::instance()->video_timeline = new VideoTimeLine(this, videotl_group, (timebar_height * videotl_bar_height));
+
+       cd_marker_bar_drag_rect = new ArdourCanvas::Rectangle (cd_marker_group, ArdourCanvas::Rect (0.0, 0.0, 100, timebar_height));
+       cd_marker_bar_drag_rect->set_outline (false);
        cd_marker_bar_drag_rect->hide ();
 
-       range_bar_drag_rect = new ArdourCanvas::SimpleRect (*range_marker_group, 0.0, 0.0, 100, timebar_height);
-       range_bar_drag_rect->property_outline_pixels() = 0;
+       range_bar_drag_rect = new ArdourCanvas::Rectangle (range_marker_group, ArdourCanvas::Rect (0.0, 0.0, 100, timebar_height));
+       range_bar_drag_rect->set_outline (false);
        range_bar_drag_rect->hide ();
 
-       transport_bar_drag_rect = new ArdourCanvas::SimpleRect (*transport_marker_group, 0.0, 0.0, 100, timebar_height);
-       transport_bar_drag_rect->property_outline_pixels() = 0;
+       transport_bar_drag_rect = new ArdourCanvas::Rectangle (transport_marker_group, ArdourCanvas::Rect (0.0, 0.0, 100, timebar_height));
+       transport_bar_drag_rect->set_outline (false);
        transport_bar_drag_rect->hide ();
 
-       transport_punchin_line = new ArdourCanvas::SimpleLine (*_master_group);
-       transport_punchin_line->property_x1() = 0.0;
-       transport_punchin_line->property_y1() = 0.0;
-       transport_punchin_line->property_x2() = 0.0;
-       transport_punchin_line->property_y2() = phys_height;
+       transport_punchin_line = new ArdourCanvas::Line (_track_canvas->root());
+       transport_punchin_line->set_x0 (0);
+       transport_punchin_line->set_y0 (0);
+       transport_punchin_line->set_x1 (0);
+       transport_punchin_line->set_y1 (ArdourCanvas::COORD_MAX);
        transport_punchin_line->hide ();
 
-       transport_punchout_line  = new ArdourCanvas::SimpleLine (*_master_group);
-       transport_punchout_line->property_x1() = 0.0;
-       transport_punchout_line->property_y1() = 0.0;
-       transport_punchout_line->property_x2() = 0.0;
-       transport_punchout_line->property_y2() = phys_height;
+       transport_punchout_line  = new ArdourCanvas::Line (_track_canvas->root());
+       transport_punchout_line->set_x0 (0);
+       transport_punchout_line->set_y0 (0);
+       transport_punchout_line->set_x1 (0);
+       transport_punchout_line->set_y1 (ArdourCanvas::COORD_MAX);
        transport_punchout_line->hide();
 
        // used to show zoom mode active zooming
-       zoom_rect = new ArdourCanvas::SimpleRect (*_master_group, 0.0, 0.0, 0.0, 0.0);
-       zoom_rect->property_outline_pixels() = 1;
+       zoom_rect = new ArdourCanvas::Rectangle (_track_canvas->root(), ArdourCanvas::Rect (0.0, 0.0, 0.0, 0.0));
        zoom_rect->hide();
 
-       zoom_rect->signal_event().connect (sigc::bind (sigc::mem_fun (*this, &Editor::canvas_zoom_rect_event), (ArdourCanvas::Item*) 0));
+       zoom_rect->Event.connect (sigc::bind (sigc::mem_fun (*this, &Editor::canvas_zoom_rect_event), (ArdourCanvas::Item*) 0));
 
        // used as rubberband rect
-       rubberband_rect = new ArdourCanvas::SimpleRect (*_trackview_group, 0.0, 0.0, 0.0, 0.0);
+       rubberband_rect = new ArdourCanvas::Rectangle (_trackview_group, ArdourCanvas::Rect (0.0, 0.0, 0.0, 0.0));
 
-       rubberband_rect->property_outline_pixels() = 1;
        rubberband_rect->hide();
 
-       tempo_bar->signal_event().connect (sigc::bind (sigc::mem_fun (*this, &Editor::canvas_tempo_bar_event), tempo_bar));
-       meter_bar->signal_event().connect (sigc::bind (sigc::mem_fun (*this, &Editor::canvas_meter_bar_event), meter_bar));
-       marker_bar->signal_event().connect (sigc::bind (sigc::mem_fun (*this, &Editor::canvas_marker_bar_event), marker_bar));
-       cd_marker_bar->signal_event().connect (sigc::bind (sigc::mem_fun (*this, &Editor::canvas_cd_marker_bar_event), cd_marker_bar));
-#ifdef WITH_VIDEOTIMELINE
-       videotl_bar_group->signal_event().connect (sigc::bind (sigc::mem_fun (*this, &Editor::canvas_videotl_bar_event), videotl_bar));
-       //videotl_bar->signal_event().connect (sigc::bind (sigc::mem_fun (*this, &Editor::canvas_videotl_bar_event), videotl_bar));
-#endif
-       range_marker_bar->signal_event().connect (sigc::bind (sigc::mem_fun (*this, &Editor::canvas_range_marker_bar_event), range_marker_bar));
-       transport_marker_bar->signal_event().connect (sigc::bind (sigc::mem_fun (*this, &Editor::canvas_transport_marker_bar_event), transport_marker_bar));
+       tempo_bar->Event.connect (sigc::bind (sigc::mem_fun (*this, &Editor::canvas_tempo_bar_event), tempo_bar));
+       meter_bar->Event.connect (sigc::bind (sigc::mem_fun (*this, &Editor::canvas_meter_bar_event), meter_bar));
+       marker_bar->Event.connect (sigc::bind (sigc::mem_fun (*this, &Editor::canvas_marker_bar_event), marker_bar));
+       cd_marker_bar->Event.connect (sigc::bind (sigc::mem_fun (*this, &Editor::canvas_cd_marker_bar_event), cd_marker_bar));
+       videotl_group->Event.connect (sigc::bind (sigc::mem_fun (*this, &Editor::canvas_videotl_bar_event), videotl_group));
+       range_marker_bar->Event.connect (sigc::bind (sigc::mem_fun (*this, &Editor::canvas_range_marker_bar_event), range_marker_bar));
+       transport_marker_bar->Event.connect (sigc::bind (sigc::mem_fun (*this, &Editor::canvas_transport_marker_bar_event), transport_marker_bar));
 
        playhead_cursor = new EditorCursor (*this, &Editor::canvas_playhead_cursor_event);
 
@@ -270,19 +197,19 @@ Editor::initialize_canvas ()
        }
        /* need to handle 4 specific types of events as catch-alls */
 
-       track_canvas->signal_scroll_event().connect (sigc::mem_fun (*this, &Editor::track_canvas_scroll_event));
-       track_canvas->signal_motion_notify_event().connect (sigc::mem_fun (*this, &Editor::track_canvas_motion_notify_event));
-       track_canvas->signal_button_press_event().connect (sigc::mem_fun (*this, &Editor::track_canvas_button_press_event));
-       track_canvas->signal_button_release_event().connect (sigc::mem_fun (*this, &Editor::track_canvas_button_release_event));
-       track_canvas->signal_drag_motion().connect (sigc::mem_fun (*this, &Editor::track_canvas_drag_motion));
-       track_canvas->signal_key_press_event().connect (sigc::mem_fun (*this, &Editor::track_canvas_key_press));
-       track_canvas->signal_key_release_event().connect (sigc::mem_fun (*this, &Editor::track_canvas_key_release));
+       _track_canvas->signal_scroll_event().connect (sigc::mem_fun (*this, &Editor::track_canvas_scroll_event));
+       _track_canvas->signal_motion_notify_event().connect (sigc::mem_fun (*this, &Editor::track_canvas_motion_notify_event));
+       _track_canvas->signal_button_press_event().connect (sigc::mem_fun (*this, &Editor::track_canvas_button_press_event));
+       _track_canvas->signal_button_release_event().connect (sigc::mem_fun (*this, &Editor::track_canvas_button_release_event));
+       _track_canvas->signal_drag_motion().connect (sigc::mem_fun (*this, &Editor::track_canvas_drag_motion));
+       _track_canvas->signal_key_press_event().connect (sigc::mem_fun (*this, &Editor::track_canvas_key_press));
+       _track_canvas->signal_key_release_event().connect (sigc::mem_fun (*this, &Editor::track_canvas_key_release));
 
-       track_canvas->set_name ("EditorMainCanvas");
-       track_canvas->add_events (Gdk::POINTER_MOTION_HINT_MASK | Gdk::SCROLL_MASK | Gdk::KEY_PRESS_MASK | Gdk::KEY_RELEASE_MASK);
-       track_canvas->signal_leave_notify_event().connect (sigc::mem_fun(*this, &Editor::left_track_canvas), false);
-       track_canvas->signal_enter_notify_event().connect (sigc::mem_fun(*this, &Editor::entered_track_canvas), false);
-       track_canvas->set_flags (CAN_FOCUS);
+       _track_canvas->set_name ("EditorMainCanvas");
+       _track_canvas->add_events (Gdk::POINTER_MOTION_HINT_MASK | Gdk::SCROLL_MASK | Gdk::KEY_PRESS_MASK | Gdk::KEY_RELEASE_MASK);
+       _track_canvas->signal_leave_notify_event().connect (sigc::mem_fun(*this, &Editor::left_track_canvas), false);
+       _track_canvas->signal_enter_notify_event().connect (sigc::mem_fun(*this, &Editor::entered_track_canvas), false);
+       _track_canvas->set_flags (CAN_FOCUS);
 
        /* set up drag-n-drop */
 
@@ -295,10 +222,10 @@ Editor::initialize_canvas ()
        target_table.push_back (TargetEntry ("text/uri-list"));
        target_table.push_back (TargetEntry ("application/x-rootwin-drop"));
 
-       track_canvas->drag_dest_set (target_table);
-       track_canvas->signal_drag_data_received().connect (sigc::mem_fun(*this, &Editor::track_canvas_drag_data_received));
+       _track_canvas->drag_dest_set (target_table);
+       _track_canvas->signal_drag_data_received().connect (sigc::mem_fun(*this, &Editor::track_canvas_drag_data_received));
 
-       track_canvas->signal_size_allocate().connect (sigc::mem_fun(*this, &Editor::track_canvas_allocate));
+       _track_canvas_viewport->signal_size_allocate().connect (sigc::mem_fun(*this, &Editor::track_canvas_viewport_allocate));
 
        ColorsChanged.connect (sigc::mem_fun (*this, &Editor::color_handler));
        color_handler();
@@ -306,45 +233,35 @@ Editor::initialize_canvas ()
 }
 
 void
-Editor::track_canvas_allocate (Gtk::Allocation alloc)
+Editor::track_canvas_viewport_allocate (Gtk::Allocation alloc)
 {
-       canvas_allocation = alloc;
-       track_canvas_size_allocated ();
+       _canvas_viewport_allocation = alloc;
+       track_canvas_viewport_size_allocated ();
 }
 
 bool
-Editor::track_canvas_size_allocated ()
+Editor::track_canvas_viewport_size_allocated ()
 {
-       bool height_changed = _canvas_height != canvas_allocation.get_height();
+       bool height_changed = _visible_canvas_height != _canvas_viewport_allocation.get_height();
 
-       _canvas_width = canvas_allocation.get_width();
-       _canvas_height = canvas_allocation.get_height();
+       _visible_canvas_width  = _canvas_viewport_allocation.get_width ();
+       _visible_canvas_height = _canvas_viewport_allocation.get_height ();
 
-       if (_session) {
-               TrackViewList::iterator i;
-
-               for (i = track_views.begin(); i != track_views.end(); ++i) {
-                       (*i)->clip_to_viewport ();
-               }
-       }
+       // SHOWTRACKS
 
        if (height_changed) {
-               if (playhead_cursor) {
-                       playhead_cursor->set_length (_canvas_height);
-               }
 
                for (LocationMarkerMap::iterator i = location_markers.begin(); i != location_markers.end(); ++i) {
-                       i->second->canvas_height_set (_canvas_height);
+                       i->second->canvas_height_set (_visible_canvas_height);
                }
 
-               vertical_adjustment.set_page_size (_canvas_height);
-               last_trackview_group_vertical_offset = get_trackview_group_vertical_offset ();
-               if ((vertical_adjustment.get_value() + _canvas_height) >= vertical_adjustment.get_upper()) {
+               vertical_adjustment.set_page_size (_visible_canvas_height);
+               if ((vertical_adjustment.get_value() + _visible_canvas_height) >= vertical_adjustment.get_upper()) {
                        /*
                           We're increasing the size of the canvas while the bottom is visible.
                           We scroll down to keep in step with the controls layout.
                        */
-                       vertical_adjustment.set_value (full_canvas_height - _canvas_height);
+                       vertical_adjustment.set_value (_full_canvas_height - _visible_canvas_height);
                }
        }
 
@@ -422,6 +339,23 @@ void
 Editor::drop_paths_part_two (const vector<string>& paths, framepos_t frame, double ypos, bool copy)
 {
        RouteTimeAxisView* tv;
+       
+       /* MIDI files must always be imported, because we consider them
+        * writable. So split paths into two vectors, and follow the import
+        * path on the MIDI part.
+        */
+
+       vector<string> midi_paths;
+       vector<string> audio_paths;
+
+       for (vector<string>::const_iterator i = paths.begin(); i != paths.end(); ++i) {
+               if (SMFSource::safe_midi_file_extension (*i)) {
+                       midi_paths.push_back (*i);
+               } else {
+                       audio_paths.push_back (*i);
+               }
+       }
+
 
        std::pair<TimeAxisView*, int> const tvp = trackview_by_y_position (ypos);
        if (tvp.first == 0) {
@@ -430,10 +364,12 @@ Editor::drop_paths_part_two (const vector<string>& paths, framepos_t frame, doub
 
                frame = 0;
 
+               do_import (midi_paths, Editing::ImportDistinctFiles, ImportAsTrack, SrcBest, frame);
+               
                if (Profile->get_sae() || Config->get_only_copy_imported_files() || copy) {
-                       do_import (paths, Editing::ImportDistinctFiles, Editing::ImportAsTrack, SrcBest, frame);
+                       do_import (audio_paths, Editing::ImportDistinctFiles, Editing::ImportAsTrack, SrcBest, frame);
                } else {
-                       do_embed (paths, Editing::ImportDistinctFiles, ImportAsTrack, frame);
+                       do_embed (audio_paths, Editing::ImportDistinctFiles, ImportAsTrack, frame);
                }
 
        } else if ((tv = dynamic_cast<RouteTimeAxisView*> (tvp.first)) != 0) {
@@ -444,10 +380,12 @@ Editor::drop_paths_part_two (const vector<string>& paths, framepos_t frame, doub
                        /* select the track, then embed/import */
                        selection->set (tv);
 
+                       do_import (midi_paths, Editing::ImportSerializeFiles, ImportToTrack, SrcBest, frame);
+
                        if (Profile->get_sae() || Config->get_only_copy_imported_files() || copy) {
-                               do_import (paths, Editing::ImportSerializeFiles, Editing::ImportToTrack, SrcBest, frame);
+                               do_import (audio_paths, Editing::ImportSerializeFiles, Editing::ImportToTrack, SrcBest, frame);
                        } else {
-                               do_embed (paths, Editing::ImportSerializeFiles, ImportToTrack, frame);
+                               do_embed (audio_paths, Editing::ImportSerializeFiles, ImportToTrack, frame);
                        }
                }
        }
@@ -462,8 +400,6 @@ Editor::drop_paths (const RefPtr<Gdk::DragContext>& context,
        vector<string> paths;
        GdkEvent ev;
        framepos_t frame;
-       double wx;
-       double wy;
        double cy;
 
        if (convert_drop_to_paths (paths, context, x, y, data, info, time) == 0) {
@@ -471,13 +407,11 @@ Editor::drop_paths (const RefPtr<Gdk::DragContext>& context,
                /* D-n-D coordinates are window-relative, so convert to "world" coordinates
                 */
 
-               track_canvas->window_to_world (x, y, wx, wy);
-
                ev.type = GDK_BUTTON_RELEASE;
-               ev.button.x = wx;
-               ev.button.y = wy;
+               ev.button.x = x;
+               ev.button.y = y;
 
-               frame = event_frame (&ev, 0, &cy);
+               frame = window_event_frame (&ev, 0, &cy);
 
                snap_to (frame);
 
@@ -504,7 +438,7 @@ Editor::drop_paths (const RefPtr<Gdk::DragContext>& context,
 int
 Editor::autoscroll_fudge_threshold () const
 {
-       return current_page_frames() / 6;
+       return current_page_samples() / 6;
 }
 
 /** @param allow_horiz true to allow horizontal autoscroll, otherwise false.
@@ -537,27 +471,27 @@ Editor::maybe_autoscroll (bool allow_horiz, bool allow_vert, bool moving_left, b
 
        Gtk::Allocation editor_list = _the_notebook.get_allocation ();
 
-       framecnt_t distance = pixel_to_frame (root_rect.get_x() + root_rect.get_width() - window_rect.get_x() - window_rect.get_width());
+       framecnt_t distance = pixel_to_sample (root_rect.get_x() + root_rect.get_width() - window_rect.get_x() - window_rect.get_width());
        if (_the_notebook.is_visible ()) {
-               distance += pixel_to_frame (editor_list.get_width());
+               distance += pixel_to_sample (editor_list.get_width());
        }
 
        /* Note whether we're fudging the autoscroll (see autoscroll_fudge_threshold) */
        _autoscroll_fudging = (distance < autoscroll_fudge_threshold ());
 
-       double const ty = _drags->current_pointer_y() - get_trackview_group_vertical_offset ();
+       double const ty = _drags->current_pointer_y();
 
        autoscroll_y = 0;
        autoscroll_x = 0;
-       if (ty < canvas_timebars_vsize && moving_up && allow_vert) {
+       if (ty < 0 && moving_up && allow_vert) {
                autoscroll_y = -1;
                startit = true;
-       } else if (ty > _canvas_height && !moving_up && allow_vert) {
+       } else if (ty > _visible_canvas_height && !moving_up && allow_vert) {
                autoscroll_y = 1;
                startit = true;
        }
 
-       framepos_t rightmost_frame = leftmost_frame + current_page_frames();
+       framepos_t rightmost_frame = leftmost_frame + current_page_samples();
        if (_autoscroll_fudging) {
                rightmost_frame -= autoscroll_fudge_threshold ();
        }
@@ -596,15 +530,14 @@ bool
 Editor::autoscroll_canvas ()
 {
        framepos_t new_frame;
-       framepos_t limit = max_framepos - current_page_frames();
-       GdkEventMotion ev;
+       framepos_t limit = max_framepos - current_page_samples();
        double new_pixel;
        double target_pixel;
        
        if (autoscroll_x_distance != 0) {
 
                if (autoscroll_x > 0) {
-                       autoscroll_x_distance = (_drags->current_pointer_frame() - (leftmost_frame + current_page_frames())) / 3;
+                       autoscroll_x_distance = (_drags->current_pointer_frame() - (leftmost_frame + current_page_samples())) / 3;
                        if (_autoscroll_fudging) {
                                autoscroll_x_distance += autoscroll_fudge_threshold () / 3;
                        }
@@ -616,7 +549,7 @@ Editor::autoscroll_canvas ()
 
        if (autoscroll_y_distance != 0) {
                if (autoscroll_y > 0) {
-                       autoscroll_y_distance = (_drags->current_pointer_y() - (get_trackview_group_vertical_offset() + _canvas_height)) / 3;
+                       autoscroll_y_distance = (_drags->current_pointer_y() - _visible_canvas_height) / 3;
                } else if (autoscroll_y < 0) {
 
                        autoscroll_y_distance = (vertical_adjustment.get_value () - _drags->current_pointer_y()) / 3;
@@ -654,10 +587,10 @@ Editor::autoscroll_canvas ()
 
        } else if (autoscroll_y > 0) {
 
-               double top_of_bottom_of_canvas = full_canvas_height - _canvas_height;
+               double const top_of_bottom_of_canvas = _full_canvas_height - _visible_canvas_height;
 
-               if (vertical_pos > full_canvas_height - autoscroll_y_distance) {
-                       new_pixel = full_canvas_height;
+               if (vertical_pos > _full_canvas_height - autoscroll_y_distance) {
+                       new_pixel = _full_canvas_height;
                } else {
                        new_pixel = vertical_pos + autoscroll_y_distance;
                }
@@ -670,7 +603,7 @@ Editor::autoscroll_canvas ()
                   (its top edge will line up with the bottom of the visible canvas.
                */
 
-               target_pixel = min (target_pixel, full_canvas_height - 10);
+               target_pixel = min (target_pixel, _full_canvas_height - 10);
 
        } else {
                target_pixel = _drags->current_pointer_y();
@@ -690,14 +623,18 @@ Editor::autoscroll_canvas ()
 
        /* fake an event. */
 
-       Glib::RefPtr<Gdk::Window> canvas_window = const_cast<Editor*>(this)->track_canvas->get_window();
+       Glib::RefPtr<Gdk::Window> canvas_window = const_cast<Editor*>(this)->_track_canvas->get_window();
        gint x, y;
        Gdk::ModifierType mask;
+       GdkEventMotion ev;
        canvas_window->get_pointer (x, y, mask);
        ev.type = GDK_MOTION_NOTIFY;
        ev.state = Gdk::BUTTON1_MASK;
-       ev.x = x;
-       ev.y = y;
+
+       /* the motion handler expects events in canvas coordinate space */
+       ArdourCanvas::Duple d = _track_canvas->window_to_canvas (ArdourCanvas::Duple (x, y));
+       ev.x = d.x;
+       ev.y = d.y;
 
        motion_handler (0, (GdkEvent*) &ev, true);
 
@@ -727,7 +664,7 @@ Editor::start_canvas_autoscroll (int dx, int dy)
        autoscroll_active = true;
        autoscroll_x = dx;
        autoscroll_y = dy;
-       autoscroll_x_distance = (framepos_t) floor (current_page_frames()/50.0);
+       autoscroll_x_distance = (framepos_t) floor (current_page_samples()/50.0);
        autoscroll_y_distance = fabs (dy * 5); /* pixels */
        autoscroll_cnt = 0;
 
@@ -775,24 +712,19 @@ Editor::ensure_time_axis_view_is_visible (const TimeAxisView& tav)
 
        double v = vertical_adjustment.get_value ();
 
-       if (begin < v || begin + tav.current_height() > v + _canvas_height - canvas_timebars_vsize) {
+       if (begin < v || begin + tav.current_height() > v + _visible_canvas_height) {
                /* try to put the TimeAxisView roughly central */
-               if (begin >= _canvas_height/2.0) {
-                       begin -= _canvas_height/2.0;
+               if (begin >= _visible_canvas_height/2.0) {
+                       begin -= _visible_canvas_height/2.0;
                }
                vertical_adjustment.set_value (begin);
        }
 }
 
+/** Called when the main vertical_adjustment has changed */
 void
 Editor::tie_vertical_scrolling ()
 {
-       scroll_canvas_vertically ();
-
-       /* this will do an immediate redraw */
-
-       controls_layout.get_vadjustment()->set_value (vertical_adjustment.get_value());
-
        if (pending_visual_change.idle_handler_id < 0) {
                _summary->set_overlays_dirty ();
        }
@@ -801,18 +733,9 @@ Editor::tie_vertical_scrolling ()
 void
 Editor::set_horizontal_position (double p)
 {
-       /* horizontal scrolling only */
-       double x1, y1, x2, y2, x_delta;
-       _master_group->get_bounds (x1, y1, x2, y2);
-
-       x_delta = - (x1 + p);
-
-       _master_group->move (x_delta, 0);
-       timebar_group->move (x_delta, 0);
-       time_line_group->move (x_delta, 0);
-       cursor_group->move (x_delta, 0);
+       horizontal_adjustment.set_value (p);
 
-       leftmost_frame = (framepos_t) floor (p * frames_per_unit);
+       leftmost_frame = (framepos_t) floor (p * samples_per_pixel);
 
        update_fixed_rulers ();
        redisplay_tempo (true);
@@ -821,99 +744,64 @@ Editor::set_horizontal_position (double p)
                _summary->set_overlays_dirty ();
        }
 
-#ifdef WITH_VIDEOTIMELINE
        update_video_timeline();
-#endif
 
        HorizontalPositionChanged (); /* EMIT SIGNAL */
-
-#ifndef GTKOSX
-       if (!autoscroll_active && !_stationary_playhead) {
-               /* force rulers and canvas to move in lock step */
-               while (gtk_events_pending ()) {
-                       gtk_main_iteration ();
-               }
-       }
-#endif
-}
-
-void
-Editor::scroll_canvas_vertically ()
-{
-       /* vertical scrolling only */
-
-       double y_delta;
-
-       y_delta = last_trackview_group_vertical_offset - get_trackview_group_vertical_offset ();
-       _trackview_group->move (0, y_delta);
-       _background_group->move (0, y_delta);
-
-       for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
-               (*i)->clip_to_viewport ();
-       }
-       last_trackview_group_vertical_offset = get_trackview_group_vertical_offset ();
-       /* required to keep the controls_layout in lock step with the canvas group */
-       update_canvas_now ();
 }
 
 void
 Editor::color_handler()
 {
-       playhead_cursor->canvas_item.property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_PlayHead.get();
-       _verbose_cursor->set_color (ARDOUR_UI::config()->canvasvar_VerboseCanvasCursor.get());
+       playhead_cursor->set_color (ARDOUR_UI::config()->get_canvasvar_PlayHead());
+       _verbose_cursor->set_color (ARDOUR_UI::config()->get_canvasvar_VerboseCanvasCursor());
 
-       meter_bar->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_MeterBar.get();
-       meter_bar->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBarSeparator.get();
+       meter_bar->set_fill_color (ARDOUR_UI::config()->get_canvasvar_MeterBar());
+       meter_bar->set_outline_color (ARDOUR_UI::config()->get_canvasvar_MarkerBarSeparator());
 
-       tempo_bar->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_TempoBar.get();
-       tempo_bar->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBarSeparator.get();
+       tempo_bar->set_fill_color (ARDOUR_UI::config()->get_canvasvar_TempoBar());
+       tempo_bar->set_outline_color (ARDOUR_UI::config()->get_canvasvar_MarkerBarSeparator());
 
-       marker_bar->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBar.get();
-       marker_bar->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBarSeparator.get();
+       marker_bar->set_fill_color (ARDOUR_UI::config()->get_canvasvar_MarkerBar());
+       marker_bar->set_outline_color (ARDOUR_UI::config()->get_canvasvar_MarkerBarSeparator());
 
-       cd_marker_bar->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_CDMarkerBar.get();
-       cd_marker_bar->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBarSeparator.get();
+       cd_marker_bar->set_fill_color (ARDOUR_UI::config()->get_canvasvar_CDMarkerBar());
+       cd_marker_bar->set_outline_color (ARDOUR_UI::config()->get_canvasvar_MarkerBarSeparator());
 
-#ifdef WITH_VIDEOTIMELINE
-       videotl_bar->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_VideoBar.get();
-       videotl_bar->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBarSeparator.get();
-#endif
+       range_marker_bar->set_fill_color (ARDOUR_UI::config()->get_canvasvar_RangeMarkerBar());
+       range_marker_bar->set_outline_color (ARDOUR_UI::config()->get_canvasvar_MarkerBarSeparator());
 
-       range_marker_bar->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_RangeMarkerBar.get();
-       range_marker_bar->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBarSeparator.get();
+       transport_marker_bar->set_fill_color (ARDOUR_UI::config()->get_canvasvar_TransportMarkerBar());
+       transport_marker_bar->set_outline_color (ARDOUR_UI::config()->get_canvasvar_MarkerBarSeparator());
 
-       transport_marker_bar->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_TransportMarkerBar.get();
-       transport_marker_bar->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBarSeparator.get();
+       cd_marker_bar_drag_rect->set_fill_color (ARDOUR_UI::config()->get_canvasvar_RangeDragBarRect());
+       cd_marker_bar_drag_rect->set_outline_color (ARDOUR_UI::config()->get_canvasvar_RangeDragBarRect());
 
-       cd_marker_bar_drag_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_RangeDragBarRect.get();
-       cd_marker_bar_drag_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_RangeDragBarRect.get();
+       range_bar_drag_rect->set_fill_color (ARDOUR_UI::config()->get_canvasvar_RangeDragBarRect());
+       range_bar_drag_rect->set_outline_color (ARDOUR_UI::config()->get_canvasvar_RangeDragBarRect());
 
-       range_bar_drag_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_RangeDragBarRect.get();
-       range_bar_drag_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_RangeDragBarRect.get();
+       transport_bar_drag_rect->set_fill_color (ARDOUR_UI::config()->get_canvasvar_TransportDragRect());
+       transport_bar_drag_rect->set_outline_color (ARDOUR_UI::config()->get_canvasvar_TransportDragRect());
 
-       transport_bar_drag_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_TransportDragRect.get();
-       transport_bar_drag_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_TransportDragRect.get();
+       transport_loop_range_rect->set_fill_color (ARDOUR_UI::config()->get_canvasvar_TransportLoopRect());
+       transport_loop_range_rect->set_outline_color (ARDOUR_UI::config()->get_canvasvar_TransportLoopRect());
 
-       transport_loop_range_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_TransportLoopRect.get();
-       transport_loop_range_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_TransportLoopRect.get();
+       transport_punch_range_rect->set_fill_color (ARDOUR_UI::config()->get_canvasvar_TransportPunchRect());
+       transport_punch_range_rect->set_outline_color (ARDOUR_UI::config()->get_canvasvar_TransportPunchRect());
 
-       transport_punch_range_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_TransportPunchRect.get();
-       transport_punch_range_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_TransportPunchRect.get();
+       transport_punchin_line->set_outline_color (ARDOUR_UI::config()->get_canvasvar_PunchLine());
+       transport_punchout_line->set_outline_color (ARDOUR_UI::config()->get_canvasvar_PunchLine());
 
-       transport_punchin_line->property_color_rgba() = ARDOUR_UI::config()->canvasvar_PunchLine.get();
-       transport_punchout_line->property_color_rgba() = ARDOUR_UI::config()->canvasvar_PunchLine.get();
+       zoom_rect->set_fill_color (ARDOUR_UI::config()->get_canvasvar_ZoomRect());
+       zoom_rect->set_outline_color (ARDOUR_UI::config()->get_canvasvar_ZoomRect());
 
-       zoom_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_ZoomRect.get();
-       zoom_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_ZoomRect.get();
+       rubberband_rect->set_outline_color (ARDOUR_UI::config()->get_canvasvar_RubberBandRect());
+       rubberband_rect->set_fill_color ((guint32) ARDOUR_UI::config()->get_canvasvar_RubberBandRect());
 
-       rubberband_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_RubberBandRect.get();
-       rubberband_rect->property_fill_color_rgba() = (guint32) ARDOUR_UI::config()->canvasvar_RubberBandRect.get();
-
-       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();
+       location_marker_color = ARDOUR_UI::config()->get_canvasvar_LocationMarker();
+       location_range_color = ARDOUR_UI::config()->get_canvasvar_LocationRange();
+       location_cd_marker_color = ARDOUR_UI::config()->get_canvasvar_LocationCDMarker();
+       location_loop_color = ARDOUR_UI::config()->get_canvasvar_LocationLoop();
+       location_punch_color = ARDOUR_UI::config()->get_canvasvar_LocationPunch();
 
        refresh_location_display ();
 /*
@@ -924,37 +812,10 @@ Editor::color_handler()
 */
 }
 
-void
-Editor::flush_canvas ()
-{
-       if (is_mapped()) {
-               update_canvas_now ();
-               // gdk_window_process_updates (GTK_LAYOUT(track_canvas->gobj())->bin_window, true);
-       }
-}
-
-void
-Editor::update_canvas_now ()
-{
-       /* GnomeCanvas has a bug whereby if its idle handler is not scheduled between
-          two calls to update_now, an assert will trip.  This wrapper works around
-          that problem by only calling update_now if the assert will not trip.
-
-          I think the GC bug is due to the fact that its code will reset need_update
-          and need_redraw to FALSE without checking to see if an idle handler is scheduled.
-          If one is scheduled, GC should probably remove it.
-       */
-
-       GnomeCanvas* c = track_canvas->gobj ();
-       if (c->need_update || c->need_redraw) {
-               track_canvas->update_now ();
-       }
-}
-
 double
 Editor::horizontal_position () const
 {
-       return frame_to_unit (leftmost_frame);
+       return sample_to_pixel (leftmost_frame);
 }
 
 void
@@ -964,10 +825,10 @@ Editor::set_canvas_cursor (Gdk::Cursor* cursor, bool save)
                current_canvas_cursor = cursor;
        }
 
-       Glib::RefPtr<Gdk::Window> win = track_canvas->get_window();
+       Glib::RefPtr<Gdk::Window> win = _track_canvas->get_window();
 
        if (win) {
-               track_canvas->get_window()->set_cursor (*cursor);
+               _track_canvas->get_window()->set_cursor (*cursor);
        }
 }
 
@@ -991,3 +852,46 @@ Editor::track_canvas_key_release (GdkEventKey*)
 
        return false;
 }
+
+double
+Editor::clamp_verbose_cursor_x (double x)
+{
+       if (x < 0) {
+               x = 0;
+       } else {
+               x = min (_visible_canvas_width - 200.0, x);
+       }
+       return x;
+}
+
+double
+Editor::clamp_verbose_cursor_y (double y)
+{
+       y = max (0.0, y);
+       y = min (_visible_canvas_height - 50, y);
+       return y;
+}
+
+ArdourCanvas::Group*
+Editor::get_time_bars_group () const
+{
+       return _time_bars_canvas->root();
+}
+
+ArdourCanvas::Group*
+Editor::get_track_canvas_group() const
+{
+       return _track_canvas->root();
+}
+
+ArdourCanvas::GtkCanvasViewport*
+Editor::get_time_bars_canvas() const
+{
+       return _time_bars_canvas_viewport;
+}
+
+ArdourCanvas::GtkCanvasViewport*
+Editor::get_track_canvas() const
+{
+       return _track_canvas_viewport;
+}