+void
+Editor::canvas_horizontally_scrolled ()
+{
+ /* this is the core function that controls horizontal scrolling of the canvas. it is called
+ whenever the horizontal_adjustment emits its "value_changed" signal. it typically executes in an
+ idle handler, which is important because tempo_map_changed() should issue redraws immediately
+ and not defer them to an idle handler.
+ */
+
+ leftmost_frame = (nframes_t) floor (horizontal_adjustment.get_value() * frames_per_unit);
+ nframes_t rightmost_frame = leftmost_frame + current_page_frames ();
+
+ if (rightmost_frame > last_canvas_frame) {
+ last_canvas_frame = rightmost_frame;
+ reset_scrolling_region ();
+ }
+
+ if (logo_item) {
+ logo_item->property_x() = horizontal_adjustment.get_value ();
+ }
+
+ update_fixed_rulers ();
+
+ redisplay_tempo (!_dragging_hscrollbar);
+}
+
+void
+Editor::color_handler()
+{
+ edit_cursor->canvas_item.property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_EditCursor.get();
+ 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();
+
+ tempo_bar->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_TempoBar.get();
+ tempo_bar->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBarSeparator.get();
+
+ marker_bar->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBar.get();
+ marker_bar->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBarSeparator.get();
+
+ 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->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_TransportMarkerBar.get();
+ transport_marker_bar->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBarSeparator.get();
+
+ 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->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();
+
+ 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->property_color_rgba() = ARDOUR_UI::config()->canvasvar_PunchLine.get();
+ transport_punchout_line->property_color_rgba() = ARDOUR_UI::config()->canvasvar_PunchLine.get();
+
+ 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->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();
+
+ refresh_location_display ();
+ redisplay_tempo (true);
+
+ if (session)
+ session->tempo_map().apply_with_metrics (*this, &Editor::draw_metric_marks); // redraw metric markers
+}
+