-/** Set the top of the y range visible in the editor.
- * Caller should have checked that Editor::pending_visual_change.idle_handler_id is < 0
- * @param y new editor top in summary coodinates.
- */
-void
-EditorSummary::set_editor_y (double const y)
-{
- double y1 = summary_y_to_editor (y);
- double const eh = _editor->visible_canvas_height();
- double y2 = y1 + eh;
-
- double const full_editor_height = _editor->_full_canvas_height;
-
- if (y2 > full_editor_height) {
- y1 -= y2 - full_editor_height;
- }
-
- if (y1 < 0) {
- y1 = 0;
- }
-
- if (suspending_editor_updates ()) {
- double const h = _pending_editor_y.second - _pending_editor_y.first;
- _pending_editor_y.first = y;
- _pending_editor_y.second = y + h;
- _pending_editor_changed = true;
- set_dirty ();
- } else {
- _editor->reset_y_origin (y1);
- }
-}
-
-/** Set the y range visible in the editor. This is achieved by scaling track heights,
- * if necessary.
- * Caller should have checked that Editor::pending_visual_change.idle_handler_id is < 0
- * @param y new editor range in summary coodinates.
- */
-void
-EditorSummary::set_editor_y (pair<double, double> const y)
-{
- if (suspending_editor_updates ()) {
- _pending_editor_y = y;
- _pending_editor_changed = true;
- set_dirty ();
- return;
- }
-
- /* Compute current height of tracks between y.first and y.second. We add up
- the total height into `total_height' and the height of complete tracks into
- `scale height'.
- */
-
- /* Copy of target range for use below */
- pair<double, double> yc = y;
- /* Total height of all tracks */
- double total_height = 0;
- /* Height of any parts of tracks that aren't fully in the desired range */
- double partial_height = 0;
- /* Height of any tracks that are fully in the desired range */
- double scale_height = 0;
-
- _editor->_routes->suspend_redisplay ();
-
- for (TrackViewList::const_iterator i = _editor->track_views.begin(); i != _editor->track_views.end(); ++i) {
-
- if ((*i)->hidden()) {
- continue;
- }
-
- double const h = (*i)->effective_height ();
- total_height += h;
-
- if (yc.first > 0 && yc.first < _track_height) {
- partial_height += (_track_height - yc.first) * h / _track_height;
- } else if (yc.first <= 0 && yc.second >= _track_height) {
- scale_height += h;
- } else if (yc.second > 0 && yc.second < _track_height) {
- partial_height += yc.second * h / _track_height;
- break;
- }
-
- yc.first -= _track_height;
- yc.second -= _track_height;
- }
-
- /* Height that we will use for scaling; use the whole editor height unless there are not
- enough tracks to fill it.
- */
- double const ch = min (total_height, _editor->visible_canvas_height());
-
- /* hence required scale factor of the complete tracks to fit the required y range;
- the amount of space they should take up divided by the amount they currently take up.
- */
- double const scale = (ch - partial_height) / scale_height;
-
- yc = y;
-
- /* Scale complete tracks within the range to make it fit */
-
- for (TrackViewList::const_iterator i = _editor->track_views.begin(); i != _editor->track_views.end(); ++i) {
-
- if ((*i)->hidden()) {
- continue;
- }
-
- if (yc.first <= 0 && yc.second >= _track_height) {
- (*i)->set_height (max (TimeAxisView::preset_height (HeightSmall), (uint32_t) ((*i)->effective_height() * scale)));
- }
-
- yc.first -= _track_height;
- yc.second -= _track_height;
- }
-
- _editor->_routes->resume_redisplay ();
-
- set_editor_y (y.first);
-}
-