+void
+Editor::tie_vertical_scrolling ()
+{
+ scroll_canvas_vertically ();
+
+ /* this will do an immediate redraw */
+
+ controls_layout.get_vadjustment()->set_value (vertical_adjustment.get_value());
+}
+
+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;
+
+ _master_group->get_bounds(x1, y1, x2, y2);
+ 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);
+}
+
+void
+Editor::scroll_canvas_vertically ()
+{
+ /* vertical scrolling only */
+ double x1, x2, y1, y2, y_delta;
+
+ _trackview_group->get_bounds(x1, y1, x2, y2);
+ y_delta = y1 + vertical_adjustment.get_value() - canvas_timebars_vsize;
+
+ _trackview_group->move (0, -y_delta);
+ _region_motion_group->move (0, -y_delta);
+
+ /* required to keep the controls_layout in sync with the canvas group */
+ track_canvas->update_now ();
+
+}