remove all MIDI-specific editing modes by making standard work either at object level...
[ardour.git] / gtk2_ardour / editor_canvas.cc
index 27a6eb479e7834048f077bcfcdc8352b589db2cf..b99189218a0fcd362a3e7b8ed0abc6b48f97b709 100644 (file)
 */
 
 #include <libgnomecanvasmm/init.h>
+#include <libgnomecanvasmm/pixbuf.h>
 #include <jack/types.h>
 #include <gtkmm2ext/utils.h>
 
-#include <ardour/audioregion.h>
-#include <ardour/profile.h>
+#include "ardour/profile.h"
 
 #include "ardour_ui.h"
 #include "editor.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 "editing.h"
 #include "rgb_macros.h"
 #include "utils.h"
-#include "time_axis_view.h"
 #include "audio_time_axis.h"
-
-#ifdef WITH_CMT
-#include "imageframe.h"
-#include "imageframe_p.h"
-#endif
+#include "editor_drag.h"
+#include "region_view.h"
+#include "editor_group_tabs.h"
+#include "editor_routes.h"
 
 #include "i18n.h"
 
@@ -65,10 +65,7 @@ extern "C"
 GType gnome_canvas_simpleline_get_type(void);
 GType gnome_canvas_simplerect_get_type(void);
 GType gnome_canvas_waveview_get_type(void);
-
-#ifdef WITH_CMT
 GType gnome_canvas_imageframe_get_type(void);
-#endif
 
 }
 
@@ -79,23 +76,16 @@ static void ardour_canvas_type_init()
        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);
-
-#ifdef WITH_CMT
-       Glib::wrap_register(gnome_canvas_imageframe_get_type(), &Gnome::Canvas::ImageFrame_Class::wrap_new);
-#endif
+       // 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();
-       
-#ifdef WITH_CMT
        (void) Gnome::Canvas::ImageFrame::get_type();
-#endif
 } 
 
-
 void
 Editor::initialize_canvas ()
 {
@@ -113,6 +103,14 @@ Editor::initialize_canvas ()
        track_canvas->set_center_scroll_region (false);
        track_canvas->set_dither (Gdk::RGB_DITHER_NONE);
 
+       Glib::RefPtr<Gdk::Screen> screen = get_screen();
+
+       if (!screen) {
+               screen = Gdk::Screen::get_default();
+       }
+       physical_screen_width = screen->get_width ();
+       physical_screen_height = screen->get_height ();
+
        /* stuff for the verbose canvas cursor */
 
        Pango::FontDescription* font = get_font_for_style (N_("VerboseCanvasCursor"));
@@ -120,10 +118,12 @@ Editor::initialize_canvas ()
        verbose_canvas_cursor = new ArdourCanvas::Text (*track_canvas->root());
        verbose_canvas_cursor->property_font_desc() = *font;
        verbose_canvas_cursor->property_anchor() = ANCHOR_NW;
-       
-       delete font;
 
+       delete font;
+       
        verbose_cursor_visible = false;
+
+       /* on the bottom, an image */
        
        if (Profile->get_sae()) {
                Image img (::get_icon (X_("saelogo")));
@@ -135,55 +135,89 @@ Editor::initialize_canvas ()
                logo_item->show ();
        }
 
-       _master_group = new ArdourCanvas::Group (*track_canvas->root(), 0.0, 0.0);
+       /* a group to hold time (measure) lines */      
+       time_line_group = new ArdourCanvas::Group (*track_canvas->root());
 
-       transport_loop_range_rect = new ArdourCanvas::SimpleRect (*_master_group, 0.0, 0.0, 0.0, 0.0);
+#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, physical_screen_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, physical_screen_height);
        transport_loop_range_rect->property_outline_pixels() = 1;
        transport_loop_range_rect->hide();
 
-       /* a group to hold time (measure) lines */
-       time_line_group = new ArdourCanvas::Group (*_master_group, 0.0, 0.0);
+       transport_punch_range_rect = new ArdourCanvas::SimpleRect (*time_line_group, 0.0, 0.0, 0.0, physical_screen_height);
+       transport_punch_range_rect->property_outline_pixels() = 0;
+       transport_punch_range_rect->hide();
 
-       _trackview_group = new ArdourCanvas::Group (*_master_group, 0.0, 0.0);
-       _region_motion_group = new ArdourCanvas::Group (*_master_group, 0.0, 0.0);
+       _background_group = new ArdourCanvas::Group (*track_canvas->root());
+       _master_group = new ArdourCanvas::Group (*track_canvas->root());
 
-       /* el barrio */
+       _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, max_canvas_coordinate, timebar_height-1.0);
+       meter_bar_group = new ArdourCanvas::Group (*track_canvas->root ());
+       if (Profile->get_sae()) {
+               meter_bar = new ArdourCanvas::SimpleRect (*meter_bar_group, 0.0, 0.0, physical_screen_width, timebar_height - 1);
+               meter_bar->property_outline_pixels() = 1;
+       } else {
+               meter_bar = new ArdourCanvas::SimpleRect (*meter_bar_group, 0.0, 0.0, physical_screen_width, timebar_height);
+               meter_bar->property_outline_pixels() = 0;
+       }
        meter_bar->property_outline_what() = (0x1 | 0x8);
-       meter_bar->property_outline_pixels() = 1;
 
-       tempo_bar_group = new ArdourCanvas::Group (*track_canvas->root());
-       tempo_bar = new ArdourCanvas::SimpleRect (*tempo_bar_group, 0.0, 0.0, max_canvas_coordinate, (timebar_height-1.0));
+       tempo_bar_group = new ArdourCanvas::Group (*track_canvas->root ());
+       if (Profile->get_sae()) {
+               tempo_bar = new ArdourCanvas::SimpleRect (*tempo_bar_group, 0.0, 0.0, physical_screen_width, (timebar_height - 1));
+               tempo_bar->property_outline_pixels() = 1;
+       } else {
+               tempo_bar = new ArdourCanvas::SimpleRect (*tempo_bar_group, 0.0, 0.0, physical_screen_width, (timebar_height));
+               tempo_bar->property_outline_pixels() = 0;
+       }
        tempo_bar->property_outline_what() = (0x1 | 0x8);
-       tempo_bar->property_outline_pixels() = 1;
 
-       range_marker_bar_group = new ArdourCanvas::Group (*track_canvas->root());
-       range_marker_bar = new ArdourCanvas::SimpleRect (*range_marker_bar_group, 0.0, 0.0, max_canvas_coordinate, (timebar_height-1.0));
+       range_marker_bar_group = new ArdourCanvas::Group (*track_canvas->root ());
+       if (Profile->get_sae()) {
+               range_marker_bar = new ArdourCanvas::SimpleRect (*range_marker_bar_group, 0.0, 0.0, physical_screen_width, (timebar_height - 1));
+               range_marker_bar->property_outline_pixels() = 1;
+       } else {
+               range_marker_bar = new ArdourCanvas::SimpleRect (*range_marker_bar_group, 0.0, 0.0, physical_screen_width, (timebar_height));
+               range_marker_bar->property_outline_pixels() = 0;
+       }
        range_marker_bar->property_outline_what() = (0x1 | 0x8);
-       range_marker_bar->property_outline_pixels() = 1;
        
-       transport_marker_bar_group = new ArdourCanvas::Group (*track_canvas->root());
-       transport_marker_bar = new ArdourCanvas::SimpleRect (*transport_marker_bar_group, 0.0, 0.0, max_canvas_coordinate, (timebar_height-1.0));
+       transport_marker_bar_group = new ArdourCanvas::Group (*track_canvas->root ());
+       if (Profile->get_sae()) {
+               transport_marker_bar = new ArdourCanvas::SimpleRect (*transport_marker_bar_group, 0.0, 0.0,  physical_screen_width, (timebar_height - 1));
+               transport_marker_bar->property_outline_pixels() = 1;
+       } else {
+               transport_marker_bar = new ArdourCanvas::SimpleRect (*transport_marker_bar_group, 0.0, 0.0,  physical_screen_width, (timebar_height));
+               transport_marker_bar->property_outline_pixels() = 0;
+       }
        transport_marker_bar->property_outline_what() = (0x1 | 0x8);
-       transport_marker_bar->property_outline_pixels() = 1;
 
-       marker_bar_group = new ArdourCanvas::Group (*track_canvas->root());
-       marker_bar = new ArdourCanvas::SimpleRect (*marker_bar_group, 0.0, 0.0, max_canvas_coordinate, (timebar_height-1.0));
+       marker_bar_group = new ArdourCanvas::Group (*track_canvas->root ());
+       if (Profile->get_sae()) {
+               marker_bar = new ArdourCanvas::SimpleRect (*marker_bar_group, 0.0, 0.0, physical_screen_width, (timebar_height - 1));
+               marker_bar->property_outline_pixels() = 1;
+       } else {
+               marker_bar = new ArdourCanvas::SimpleRect (*marker_bar_group, 0.0, 0.0, physical_screen_width, (timebar_height));
+               marker_bar->property_outline_pixels() = 0;
+       }
        marker_bar->property_outline_what() = (0x1 | 0x8);
-       marker_bar->property_outline_pixels() = 1;
        
-       cd_marker_bar_group = new ArdourCanvas::Group (*track_canvas->root());
-       cd_marker_bar = new ArdourCanvas::SimpleRect (*cd_marker_bar_group, 0.0, 0.0, max_canvas_coordinate, (timebar_height-1.0));
+       cd_marker_bar_group = new ArdourCanvas::Group (*track_canvas->root ());
+       if (Profile->get_sae()) {
+               cd_marker_bar = new ArdourCanvas::SimpleRect (*cd_marker_bar_group, 0.0, 0.0, physical_screen_width, (timebar_height - 1));
+               cd_marker_bar->property_outline_pixels() = 1;
+       } else {
+               cd_marker_bar = new ArdourCanvas::SimpleRect (*cd_marker_bar_group, 0.0, 0.0, physical_screen_width, (timebar_height));
+               cd_marker_bar->property_outline_pixels() = 0;
+       }
        cd_marker_bar->property_outline_what() = (0x1 | 0x8);
-       cd_marker_bar->property_outline_pixels() = 1;
-
-       range_marker_drag_rect = new ArdourCanvas::SimpleRect (*time_line_group, 0.0, 0.0, 0.0, 0.0);
-       //range_marker_drag_rect = new ArdourCanvas::SimpleRect (*_master_group, 0.0, 0.0, 0.0, 0.0);
-       range_marker_drag_rect->hide ();
 
-       timebar_group =  new ArdourCanvas::Group (*track_canvas->root());
+       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);
@@ -193,14 +227,6 @@ Editor::initialize_canvas ()
        marker_group = new ArdourCanvas::Group (*timebar_group, 0.0, timebar_height);
        cd_marker_group = new ArdourCanvas::Group (*timebar_group, 0.0, 0.0);
 
-       marker_drag_line_points.push_back(Gnome::Art::Point(0.0, 0.0));
-       marker_drag_line_points.push_back(Gnome::Art::Point(0.0, 1.0));
-
-       marker_drag_line = new ArdourCanvas::Line (*timebar_group);
-       marker_drag_line->property_width_pixels() = 1;
-       marker_drag_line->property_points() = marker_drag_line_points;
-       marker_drag_line->hide();
-
        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;
        cd_marker_bar_drag_rect->hide ();
@@ -213,24 +239,18 @@ Editor::initialize_canvas ()
        transport_bar_drag_rect->property_outline_pixels() = 0;
        transport_bar_drag_rect->hide ();
 
-       transport_punch_range_rect = new ArdourCanvas::SimpleRect (*_master_group, 0.0, 0.0, 0.0, 0.0);
-       transport_punch_range_rect->property_outline_pixels() = 0;
-       transport_punch_range_rect->hide();
-       
-//     transport_loop_range_rect->lower_to_bottom (); // loop on the bottom
-
        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() = 0.0;
+       transport_punchin_line->property_y2() = physical_screen_height;
        transport_punchin_line->hide ();
        
-       transport_punchout_line = new ArdourCanvas::SimpleLine (*_master_group);
+       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() = 0.0;
+       transport_punchout_line->property_y2() = physical_screen_height;
        transport_punchout_line->hide();
        
        // used to show zoom mode active zooming
@@ -252,24 +272,19 @@ Editor::initialize_canvas ()
        cd_marker_bar->signal_event().connect (bind (mem_fun (*this, &Editor::canvas_cd_marker_bar_event), cd_marker_bar));
        range_marker_bar->signal_event().connect (bind (mem_fun (*this, &Editor::canvas_range_marker_bar_event), range_marker_bar));
        transport_marker_bar->signal_event().connect (bind (mem_fun (*this, &Editor::canvas_transport_marker_bar_event), transport_marker_bar));
-       
-       ZoomChanged.connect (bind (mem_fun(*this, &Editor::update_loop_range_view), false));
-       ZoomChanged.connect (bind (mem_fun(*this, &Editor::update_punch_range_view), false));
-
-       playhead_cursor = new Cursor (*this, &Editor::canvas_playhead_cursor_event);
 
-       initial_ruler_update_required = true;
+       playhead_cursor = new EditorCursor (*this, &Editor::canvas_playhead_cursor_event);
 
        if (logo_item) {
                logo_item->lower_to_bottom ();
        }
-
        /* need to handle 4 specific types of events as catch-alls */
 
        track_canvas->signal_scroll_event().connect (mem_fun (*this, &Editor::track_canvas_scroll_event));
        track_canvas->signal_motion_notify_event().connect (mem_fun (*this, &Editor::track_canvas_motion_notify_event));
        track_canvas->signal_button_press_event().connect (mem_fun (*this, &Editor::track_canvas_button_press_event));
        track_canvas->signal_button_release_event().connect (mem_fun (*this, &Editor::track_canvas_button_release_event));
+       track_canvas->signal_drag_motion().connect (mem_fun (*this, &Editor::track_canvas_drag_motion));
 
        track_canvas->set_name ("EditorMainCanvas");
        track_canvas->add_events (Gdk::POINTER_MOTION_HINT_MASK|Gdk::SCROLL_MASK);
@@ -283,7 +298,6 @@ Editor::initialize_canvas ()
        
        // Drag-N-Drop from the region list can generate this target
        target_table.push_back (TargetEntry ("regions"));
-       target_table.push_back (TargetEntry ("routes"));
 
        target_table.push_back (TargetEntry ("text/plain"));
        target_table.push_back (TargetEntry ("text/uri-list"));
@@ -303,79 +317,54 @@ void
 Editor::track_canvas_allocate (Gtk::Allocation alloc)
 {
        canvas_allocation = alloc;
-
-       if (!initial_ruler_update_required) {
-               if (!canvas_idle_queued) {
-                       /* call this first so that we do stuff before any pending redraw */
-                       Glib::signal_idle().connect (mem_fun (*this, &Editor::track_canvas_size_allocated), false);
-                       canvas_idle_queued = true;
-               }
-               return;
-       } 
-
-       initial_ruler_update_required = false;
        track_canvas_size_allocated ();
 }
 
 bool
 Editor::track_canvas_size_allocated ()
 {
-       if (canvas_idle_queued) {
-               canvas_idle_queued = false;
-       }
+       bool height_changed = _canvas_height != canvas_allocation.get_height();
 
-       canvas_width = canvas_allocation.get_width();
-       canvas_height = canvas_allocation.get_height();
-
-       full_canvas_height = canvas_height;
+       _canvas_width = canvas_allocation.get_width();
+       _canvas_height = canvas_allocation.get_height();
 
        if (session) {
                TrackViewList::iterator i;
                double height = 0;
 
                for (i = track_views.begin(); i != track_views.end(); ++i) {
-                       if ((*i)->control_parent) {
-                               height += (*i)->effective_height;
-                       }
+                       height += (*i)->effective_height ();
+                       (*i)->clip_to_viewport ();
                }
                
                full_canvas_height = height + canvas_timebars_vsize;
        }
 
-       zoom_range_clock.set ((nframes64_t) floor ((canvas_width * frames_per_unit)));
-       playhead_cursor->set_position (playhead_cursor->current_frame);
-
-       horizontal_adjustment.set_upper (session->current_end_frame()/frames_per_unit);
-       horizontal_adjustment.set_page_size (current_page_frames()/frames_per_unit);
-
-       reset_hscrollbar_stepping ();
-
-       if (playhead_cursor) {
-               playhead_cursor->set_length (canvas_height);
-       }
-
-       vertical_adjustment.set_page_size (canvas_height);
+       if (height_changed) {
+               if (playhead_cursor) {
+                       playhead_cursor->set_length (_canvas_height);
+               }
        
-       for (MarkerSelection::iterator x = selection->markers.begin(); x != selection->markers.end(); ++x) {
-               (*x)->set_line_vpos (0, canvas_height);
-       }
-
-       marker_drag_line_points.back().set_y(canvas_height);
-       range_marker_drag_rect->property_y2() = canvas_height;
-       transport_loop_range_rect->property_y2() = canvas_height;
-       transport_punch_range_rect->property_y2() = canvas_height;
-       transport_punchin_line->property_y2() = canvas_height;
-       transport_punchout_line->property_y2() = canvas_height;
+               for (MarkerSelection::iterator x = selection->markers.begin(); x != selection->markers.end(); ++x) {
+                       (*x)->set_line_vpos (0, _canvas_height);
+               }
 
-       tempo_bar->property_x2() = canvas_width;
-       meter_bar->property_x2() = canvas_width;
-       marker_bar->property_x2() = canvas_width;
-       cd_marker_bar->property_x2() = canvas_width;
-       range_marker_bar->property_x2() = canvas_width;
-       transport_marker_bar->property_x2() = canvas_width;
+               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()) {
+                       /* 
+                          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);
+               }
+       }
 
+       handle_new_duration ();
+       reset_hscrollbar_stepping ();
        update_fixed_rulers();
-       redisplay_tempo (true);
+       redisplay_tempo (false);
+       _summary->set_overlays_dirty ();
 
        Resized (); /* EMIT_SIGNAL */
 
@@ -385,54 +374,67 @@ Editor::track_canvas_size_allocated ()
 void
 Editor::controls_layout_size_request (Requisition* req)
 {
-       TreeModel::Children rows = route_display_model->children();
-       TreeModel::Children::iterator i;
-       double pos;
-
-       for (pos = 0, i = rows.begin(); i != rows.end(); ++i) {
-               TimeAxisView *tv = (*i)[route_display_columns.tv];
-               if (tv != 0) {
-                       pos += tv->effective_height;
-               }
+       double pos = 0;
+       for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
+               pos += (*i)->effective_height ();
+               (*i)->clip_to_viewport ();
        }
 
-       RefPtr<Gdk::Screen> screen = get_screen();
+       gint height = min ((gint) pos, (gint) (physical_screen_height - 600));
+       
+       bool changed = false;
 
-       if (!screen) {
-               screen = Gdk::Screen::get_default();
+       gint w = edit_controls_vbox.get_width();
+       if (_group_tabs->is_mapped()) {
+               w += _group_tabs->get_width ();
        }
-
-       gint width = max (edit_controls_vbox.get_width(),  controls_layout.get_width());
+               
+       gint width = max (w, controls_layout.get_width());
 
        /* don't get too big. the fudge factors here are just guesses */
 
-       width =  min (width, screen->get_width() - 300);
+       width =  min (width, (gint) (physical_screen_width - 300));
+
+       if ((req->width != width) || (req->height != height)) {
+               changed = true;
+               controls_layout_size_request_connection.disconnect ();
+       }
 
        if (req->width != width) {
+               gint vbox_width = edit_controls_vbox.get_width();
+               if (_group_tabs->is_mapped()) {
+                       vbox_width += _group_tabs->get_width();
+               }
                req->width = width;
+
+               /* this one is important: it determines how big the layout thinks it really is, as 
+                  opposed to what it displays on the screen
+               */
+               controls_layout.property_width () = vbox_width;
+               controls_layout.property_width_request () = vbox_width;
+
+               // time_button_event_box.property_width_request () = vbox_width;
+               // zoom_box.property_width_request () = vbox_width;
        }
 
-       gint height = min ( (gint) pos, (screen->get_height() - 400));
        if (req->height != height) {
                req->height = height;
+               controls_layout.property_height () = (guint) floor (pos);
+               controls_layout.property_height_request () = height;
        }
 
-       if ((width != edit_controls_vbox.get_width()) || height !=  pos) {
-
-               /* this one is important: it determines how big the layout thinks it really is, as 
-                  opposed to what it displays on the screen
-               */
-               controls_layout.set_size (edit_controls_vbox.get_width(), pos );
-               controls_layout.set_size_request(edit_controls_vbox.get_width(), -1);
-               time_button_event_box.set_size_request(edit_controls_vbox.get_width(), -1);
-               zoom_box.set_size_request(edit_controls_vbox.get_width(), -1);
+       if (changed) {
+               controls_layout_size_request_connection = controls_layout.signal_size_request().connect (mem_fun (*this, &Editor::controls_layout_size_request));
        }
+       //cerr << "sizes = " << req->width << " " << edit_controls_vbox.get_width() << " " << controls_layout.get_width() << " " << zoom_box.get_width() << " " << time_button_frame.get_width() << endl;//DEBUG        
 }
 
 bool
-Editor::track_canvas_map_handler (GdkEventAny* ev)
+Editor::track_canvas_map_handler (GdkEventAny* /*ev*/)
 {
-       track_canvas->get_window()->set_cursor (*current_canvas_cursor);
+       if (current_canvas_cursor) {
+               track_canvas->get_window()->set_cursor (*current_canvas_cursor);
+       }
        return false;
 }
 
@@ -442,56 +444,27 @@ Editor::track_canvas_drag_data_received (const RefPtr<Gdk::DragContext>& context
                                         const SelectionData& data,
                                         guint info, guint time)
 {
-       cerr << "drop on canvas, target = " << data.get_target() << endl;
-
        if (data.get_target() == "regions") {
                drop_regions (context, x, y, data, info, time);
-       }
-       else if(data.get_target() == "routes") {
-               drop_routes (context, x, y, data, info, time);
-       }
-       else {
+       } else {
                drop_paths (context, x, y, data, info, time);
        }
 }
 
+bool
+Editor::idle_drop_paths (vector<ustring> paths, nframes64_t frame, double ypos)
+{
+       drop_paths_part_two (paths, frame, ypos);
+       return false;
+}
+
 void
-Editor::drop_paths (const RefPtr<Gdk::DragContext>& context,
-                   int x, int y, 
-                   const SelectionData& data,
-                   guint info, guint time)
+Editor::drop_paths_part_two (const vector<ustring>& paths, nframes64_t frame, double ypos)
 {
-       TimeAxisView* tvp;
        RouteTimeAxisView* tv;
-       double cy;
-       vector<ustring> paths;
-       string spath;
-       GdkEvent ev;
-       nframes64_t frame;
-
-       if (convert_drop_to_paths (paths, context, x, y, data, info, time)) {
-               goto out;
-       }
-
-       /* D-n-D coordinates are window-relative, so convert to "world" coordinates
-        */
-
-       double wx;
-       double wy;
-
-       track_canvas->window_to_world (x, y, wx, wy);
-       //wx += horizontal_adjustment.get_value();
-       //wy += vertical_adjustment.get_value();
-       
-       ev.type = GDK_BUTTON_RELEASE;
-       ev.button.x = wx;
-       ev.button.y = wy;
 
-       frame = event_frame (&ev, 0, &cy);
-
-       snap_to (frame);
-
-       if ((tvp = trackview_by_y_position (cy)) == 0) {
+       std::pair<TimeAxisView*, int> const tvp = trackview_by_y_position (ypos);
+       if (tvp.first == 0) {
 
                /* drop onto canvas background: create new tracks */
 
@@ -503,89 +476,90 @@ Editor::drop_paths (const RefPtr<Gdk::DragContext>& context,
                        do_embed (paths, Editing::ImportDistinctFiles, ImportAsTrack, frame);
                }
                
-       } else if ((tv = dynamic_cast<RouteTimeAxisView*>(tvp)) != 0) {
+       } else if ((tv = dynamic_cast<RouteTimeAxisView*> (tvp.first)) != 0) {
 
                /* check that its an audio track, not a bus */
                
-               /* check that its an audio track, not a bus */
-               
                if (tv->get_diskstream()) {
-                       /* select the track, then embed */
+                       /* select the track, then embed/import */
                        selection->set (tv);
 
                        if (Profile->get_sae() || Config->get_only_copy_imported_files()) {
-                               do_import (paths, Editing::ImportDistinctFiles, Editing::ImportToTrack, SrcBest, frame); 
+                               do_import (paths, Editing::ImportSerializeFiles, Editing::ImportToTrack, SrcBest, frame); 
                        } else {
-                               do_embed (paths, Editing::ImportDistinctFiles, ImportToTrack, frame);
+                               do_embed (paths, Editing::ImportSerializeFiles, ImportToTrack, frame);
                        }
                }
        }
-
-  out:
-       context->drag_finish (true, false, time);
 }
 
 void
-Editor::drop_regions (const RefPtr<Gdk::DragContext>& context,
-                     int x, int y, 
-                     const SelectionData& data,
-                     guint info, guint time)
+Editor::drop_paths (const RefPtr<Gdk::DragContext>& context,
+                   int x, int y, 
+                   const SelectionData& data,
+                   guint info, guint time)
 {
-       const SerializedObjectPointers<boost::shared_ptr<Region> >* sr = 
-               reinterpret_cast<const SerializedObjectPointers<boost::shared_ptr<Region> > *> (data.get_data());
+       vector<ustring> paths;
+       GdkEvent ev;
+       nframes64_t frame;
+       double wx;
+       double wy;
+       double cy;
 
-       for (uint32_t i = 0; i < sr->cnt; ++i) {
+       if (convert_drop_to_paths (paths, context, x, y, data, info, time) == 0) {
+               
+               /* D-n-D coordinates are window-relative, so convert to "world" coordinates
+                */
 
-               boost::shared_ptr<Region> r = sr->data[i];
+               track_canvas->window_to_world (x, y, wx, wy);
+               
+               ev.type = GDK_BUTTON_RELEASE;
+               ev.button.x = wx;
+               ev.button.y = wy;
+               
+               frame = event_frame (&ev, 0, &cy);
                
-               insert_region_list_drag (r, x, y);
+               snap_to (frame);
+               
+#ifdef GTKOSX
+               /* We are not allowed to call recursive main event loops from within
+                  the main event loop with GTK/Quartz. Since import/embed wants
+                  to push up a progress dialog, defer all this till we go idle.
+               */
+               Glib::signal_idle().connect (bind (mem_fun (*this, &Editor::idle_drop_paths), paths, frame, cy));
+#else
+               drop_paths_part_two (paths, frame, cy);
+#endif
        }
 
        context->drag_finish (true, false, time);
 }
 
 void
-Editor::drop_routes (const Glib::RefPtr<Gdk::DragContext>& context,
-                    int x, int y,
-                    const Gtk::SelectionData& data,
-                    guint info, guint time) {
-       const SerializedObjectPointers<boost::shared_ptr<Route> >* sr = 
-               reinterpret_cast<const SerializedObjectPointers<boost::shared_ptr<Route> > *> (data.get_data());
-
-       for (uint32_t i = 0; i < sr->cnt; ++i) {
-               boost::shared_ptr<Route> r = sr->data[i];
-               insert_route_list_drag (r, x, y);
-       }
-
-       context->drag_finish (true, false, time);
+Editor::drop_regions (const RefPtr<Gdk::DragContext>& /*context*/,
+                     int /*x*/, int /*y*/, 
+                     const SelectionData& /*data*/,
+                     guint /*info*/, guint /*time*/)
+{
+       assert (_drag);
+       _drag->end_grab (0);
+       delete _drag;
+       _drag = 0;
 }
 
 void
-Editor::maybe_autoscroll (GdkEventMotion* event)
+Editor::maybe_autoscroll (GdkEventMotion* event, bool allow_vert)
 {
        nframes64_t rightmost_frame = leftmost_frame + current_page_frames();
-       nframes64_t frame = drag_info.current_pointer_frame;
+       nframes64_t frame = _drag->current_pointer_frame();
        bool startit = false;
-       double vertical_pos = vertical_adjustment.get_value();
-       double upper = vertical_adjustment.get_upper();
-
-       /* 
-          adjust the event.y to take account of the bounds 
-          of the _trackview_group 
-       */
-
-       double vsx1, vsx2, vsy1, vsy2;
-       _trackview_group->get_bounds (vsx1, vsy1, vsx2, vsy2);
 
        autoscroll_y = 0;
        autoscroll_x = 0;
-
-       if ((event->y - vsy1) < vertical_pos) {
+       if (event->y < canvas_timebars_vsize && allow_vert) {
                autoscroll_y = -1;
                startit = true;
-       }
-
-       if ((event->y - vsy1) > (vertical_pos + canvas_height - canvas_timebars_vsize) && vertical_pos <= upper) {
+       } else if (event->y > _canvas_height) {
                autoscroll_y = 1;
                startit = true;
        }
@@ -621,43 +595,6 @@ Editor::maybe_autoscroll (GdkEventMotion* event)
        last_autoscroll_y = autoscroll_y;
 }
 
-void
-Editor::maybe_autoscroll_horizontally (GdkEventMotion* event)
-{
-       nframes64_t rightmost_frame = leftmost_frame + current_page_frames();
-       nframes64_t frame = drag_info.current_pointer_frame;
-       bool startit = false;
-
-       autoscroll_y = 0;
-       autoscroll_x = 0;
-
-       if (frame > rightmost_frame) {
-
-               if (rightmost_frame < max_frames) {
-                       autoscroll_x = 1;
-                       startit = true;
-               }
-
-       } else if (frame < leftmost_frame) {
-               if (leftmost_frame > 0) {
-                       autoscroll_x = -1;
-                       startit = true;
-               }
-
-       }
-
-       if ((autoscroll_x != last_autoscroll_x) || (autoscroll_y != last_autoscroll_y) || (autoscroll_x == 0 && autoscroll_y == 0)) {
-               stop_canvas_autoscroll ();
-       }
-       
-       if (startit && autoscroll_timeout_tag < 0) {
-               start_canvas_autoscroll (autoscroll_x, autoscroll_y);
-       }
-
-       last_autoscroll_x = autoscroll_x;
-       last_autoscroll_y = autoscroll_y;
-}
-
 gint
 Editor::_autoscroll_canvas (void *arg)
 {
@@ -673,45 +610,24 @@ Editor::autoscroll_canvas ()
        double new_pixel;
        double target_pixel;
 
+       assert (_drag);
+
        if (autoscroll_x_distance != 0) {
+               if (autoscroll_x > 0) {
+                       autoscroll_x_distance = (unit_to_frame (_drag->current_pointer_x()) - (leftmost_frame + current_page_frames())) / 3;
+               } else if (autoscroll_x < 0) {
+                       autoscroll_x_distance = (leftmost_frame - unit_to_frame (_drag->current_pointer_x())) / 3;
 
-               if (autoscroll_cnt == 50) { /* 0.5 seconds */
-                       
-                       /* after about a while, speed up a bit by changing the timeout interval */
-                       
-                       autoscroll_x_distance = (nframes64_t) floor (current_page_frames()/30.0f);
-                       
-               } else if (autoscroll_cnt == 150) { /* 1.0 seconds */
-                       
-                       autoscroll_x_distance = (nframes64_t) floor (current_page_frames()/20.0f);
-                       
-               } else if (autoscroll_cnt == 300) { /* 1.5 seconds */
-                       
-                       /* after about another while, speed up by increasing the shift per callback */
-                       
-                       autoscroll_x_distance =  (nframes64_t) floor (current_page_frames()/10.0f);
-                       
-               } 
+               }
        }
 
        if (autoscroll_y_distance != 0) {
+               if (autoscroll_y > 0) {
+                       autoscroll_y_distance = (_drag->current_pointer_y() - (get_trackview_group_vertical_offset() + _canvas_height)) / 3;
+               } else if (autoscroll_y < 0) {
 
-               if (autoscroll_cnt == 50) { /* 0.5 seconds */
-                       
-                       /* after about a while, speed up a bit by changing the timeout interval */
-                       
-                       autoscroll_y_distance = 10;
-                       
-               } else if (autoscroll_cnt == 150) { /* 1.0 seconds */
-                       
-                       autoscroll_y_distance = 20;
-                       
-               } else if (autoscroll_cnt == 300) { /* 1.5 seconds */
-                       
-                       /* after about another while, speed up by increasing the shift per callback */
-                       
-                       autoscroll_y_distance =  40;
-               } 
+                       autoscroll_y_distance = (vertical_adjustment.get_value () - _drag->current_pointer_y()) / 3;
+               }
        }
 
        if (autoscroll_x < 0) {
@@ -740,12 +656,12 @@ Editor::autoscroll_canvas ()
                        new_pixel = vertical_pos - autoscroll_y_distance;
                }
 
-               target_pixel = drag_info.current_pointer_y - autoscroll_y_distance;
+               target_pixel = _drag->current_pointer_y() - autoscroll_y_distance;
                target_pixel = max (target_pixel, 0.0);
 
        } else if (autoscroll_y > 0) {
 
-               double top_of_bottom_of_canvas = full_canvas_height - canvas_height;
+               double top_of_bottom_of_canvas = full_canvas_height - _canvas_height;
 
                if (vertical_pos > full_canvas_height - autoscroll_y_distance) {
                        new_pixel = full_canvas_height;
@@ -755,7 +671,7 @@ Editor::autoscroll_canvas ()
 
                new_pixel = min (top_of_bottom_of_canvas, new_pixel);
 
-               target_pixel = drag_info.current_pointer_y + autoscroll_y_distance;
+               target_pixel = _drag->current_pointer_y() + autoscroll_y_distance;
                
                /* don't move to the full canvas height because the item will be invisible
                   (its top edge will line up with the bottom of the visible canvas.
@@ -764,12 +680,10 @@ Editor::autoscroll_canvas ()
                target_pixel = min (target_pixel, full_canvas_height - 10);
                
        } else {
-               target_pixel = drag_info.current_pointer_y;
+               target_pixel = _drag->current_pointer_y();
                new_pixel = vertical_pos;
        }
 
-
-
        if ((new_frame == 0 || new_frame == limit) && (new_pixel == 0 || new_pixel == DBL_MAX)) {
                /* we are done */
                return false;
@@ -792,7 +706,7 @@ Editor::autoscroll_canvas ()
        ev.x = x;
        ev.y = y;
 
-       motion_handler (drag_info.item, (GdkEvent*) &ev, drag_info.item_type, true);
+       motion_handler (_drag->item(), (GdkEvent*) &ev, true);
 
        autoscroll_cnt++;
 
@@ -842,7 +756,7 @@ Editor::stop_canvas_autoscroll ()
 }
 
 bool
-Editor::left_track_canvas (GdkEventCrossing *ev)
+Editor::left_track_canvas (GdkEventCrossing */*ev*/)
 {
        set_entered_track (0);
        set_entered_regionview (0);
@@ -851,7 +765,7 @@ Editor::left_track_canvas (GdkEventCrossing *ev)
 }
 
 bool
-Editor::entered_track_canvas (GdkEventCrossing *ev)
+Editor::entered_track_canvas (GdkEventCrossing */*ev*/)
 {
        reset_canvas_action_sensitivity (true);
        return FALSE;
@@ -865,70 +779,63 @@ Editor::tie_vertical_scrolling ()
        /* 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 ();
+       }
 }
 
 void
 Editor::scroll_canvas_horizontally ()
 {
-       nframes64_t time_origin = (nframes64_t) floor (horizontal_adjustment.get_value() * frames_per_unit);
-
-       if (time_origin != leftmost_frame) {
-               canvas_scroll_to (time_origin);
-       }
-
        /* horizontal scrolling only */
-       double x1, x2, y1, y2, x_delta;
+       double x1, y1, x2, y2, x_delta;
+       _master_group->get_bounds (x1, y1, x2, y2);
 
-       _master_group->get_bounds(x1, y1, x2, y2);
-       x_delta = x1 + horizontal_adjustment.get_value();
+       x_delta = - (x1 +  horizontal_adjustment.get_value());
 
-       _master_group->move (-x_delta, 0);
-       timebar_group->move (-x_delta, 0);
-       cursor_group->move (-x_delta, 0);
-}
+       _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);
 
-void
-Editor::scroll_canvas_vertically ()
-{
-       /* vertical scrolling only */
-       double x1, x2, y1, y2, y_delta;
+       leftmost_frame = (nframes64_t) floor (horizontal_adjustment.get_value() * frames_per_unit);
 
-       _trackview_group->get_bounds(x1, y1, x2, y2);
-       y_delta = y1 + vertical_adjustment.get_value() - canvas_timebars_vsize;
+       update_fixed_rulers ();
+       redisplay_tempo (true);
 
-       _trackview_group->move (0, -y_delta);
-       _region_motion_group->move (0, -y_delta);
+       if (pending_visual_change.idle_handler_id < 0) {
+               _summary->set_overlays_dirty ();
+       }
 
 #ifndef GTKOSX
-       /* required to keep the controls_layout in lock step with the canvas group */
-       track_canvas->update_now ();
+       if (!autoscroll_active) {
+               /* force rulers and canvas to move in lock step */
+               while (gtk_events_pending ()) {
+                       gtk_main_iteration ();
+               }
+       }
 #endif
-}
-
-void 
-Editor::canvas_horizontally_scrolled ()
-{
-       nframes64_t time_origin = (nframes64_t) floor (horizontal_adjustment.get_value() * frames_per_unit);
 
-       if (time_origin != leftmost_frame) {
-               canvas_scroll_to (time_origin);
-       }
 }
 
 void
-Editor::canvas_scroll_to (nframes64_t time_origin)
+Editor::scroll_canvas_vertically ()
 {
-       leftmost_frame = time_origin;
-       nframes64_t rightmost_frame = leftmost_frame + current_page_frames ();
+       /* vertical scrolling only */
 
-       if (rightmost_frame > last_canvas_frame) {
-               last_canvas_frame = rightmost_frame;
-               //reset_scrolling_region ();
-       }
-       
-       update_fixed_rulers ();
+       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);
 
-       redisplay_tempo (!_dragging_hscrollbar);
+       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
@@ -936,7 +843,7 @@ Editor::color_handler()
 {
        playhead_cursor->canvas_item.property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_PlayHead.get();
        verbose_canvas_cursor->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_VerboseCanvasCursor.get();
-       
+
        meter_bar->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_MeterBar.get();
        meter_bar->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBarSeparator.get();
 
@@ -964,11 +871,6 @@ Editor::color_handler()
        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();
 
-       marker_drag_line->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerDragLine.get();
-
-       range_marker_drag_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_RangeDragRect.get();
-       range_marker_drag_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_RangeDragRect.get();
-
        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();
 
@@ -991,18 +893,37 @@ Editor::color_handler()
        location_punch_color = ARDOUR_UI::config()->canvasvar_LocationPunch.get();
 
        refresh_location_display ();
+/*
        redisplay_tempo (true);
 
        if (session)
                session->tempo_map().apply_with_metrics (*this, &Editor::draw_metric_marks); // redraw metric markers
+*/
 }
 
-
 void
 Editor::flush_canvas ()
 {
        if (is_mapped()) {
-               track_canvas->update_now ();
+               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 ();
+       }
+}