+BBTRulerDrag::BBTRulerDrag (Editor* e, ArdourCanvas::Item* i)
+ : Drag (e, i)
+ , _grab_qn (0.0)
+ , _tempo (0)
+ , before_state (0)
+{
+ DEBUG_TRACE (DEBUG::Drags, "New BBTRulerDrag\n");
+
+}
+
+void
+BBTRulerDrag::start_grab (GdkEvent* event, Gdk::Cursor* cursor)
+{
+ Drag::start_grab (event, cursor);
+ TempoMap& map (_editor->session()->tempo_map());
+ _tempo = const_cast<TempoSection*> (&map.tempo_section_at_frame (raw_grab_frame()));
+ ostringstream sstr;
+
+ sstr << "^" << fixed << setprecision(3) << map.tempo_at_frame (adjusted_current_frame (event)).note_types_per_minute() << "\n";
+ sstr << "<" << fixed << setprecision(3) << _tempo->note_types_per_minute();
+ show_verbose_cursor_text (sstr.str());
+ finished (event, false);
+}
+
+void
+BBTRulerDrag::setup_pointer_frame_offset ()
+{
+ TempoMap& map (_editor->session()->tempo_map());
+ const double beat_at_frame = max (0.0, map.beat_at_frame (raw_grab_frame()));
+ const uint32_t divisions = _editor->get_grid_beat_divisions (0);
+ double beat = 0.0;
+
+ if (divisions > 0) {
+ beat = floor (beat_at_frame) + (floor (((beat_at_frame - floor (beat_at_frame)) * divisions)) / divisions);
+ } else {
+ /* while it makes some sense for the user to determine the division to 'grab',
+ grabbing a bar often leads to confusing results wrt the actual tempo section being altered
+ and the result over steep tempo curves. Use sixteenths.
+ */
+ beat = floor (beat_at_frame) + (floor (((beat_at_frame - floor (beat_at_frame)) * 4)) / 4);
+ }
+
+ _grab_qn = map.quarter_note_at_beat (beat);
+
+ _pointer_frame_offset = raw_grab_frame() - map.frame_at_quarter_note (_grab_qn);
+
+}
+
+void
+BBTRulerDrag::motion (GdkEvent* event, bool first_move)
+{
+ TempoMap& map (_editor->session()->tempo_map());
+
+ if (first_move) {
+ /* get current state */
+ before_state = &map.get_state();
+ _editor->begin_reversible_command (_("dilate tempo"));
+ }
+
+ framepos_t pf;
+
+ if (_editor->snap_musical()) {
+ pf = adjusted_current_frame (event, false);
+ } else {
+ pf = adjusted_current_frame (event);
+ }
+
+ if (ArdourKeyboard::indicates_constraint (event->button.state)) {
+ /* adjust previous tempo to match pointer frame */
+ _editor->session()->tempo_map().gui_dilate_tempo (_tempo, map.frame_at_quarter_note (_grab_qn), pf);
+ }
+ ostringstream sstr;
+ sstr << "^" << fixed << setprecision(3) << map.tempo_at_frame (pf).note_types_per_minute() << "\n";
+ sstr << "<" << fixed << setprecision(3) << _tempo->note_types_per_minute();
+ show_verbose_cursor_text (sstr.str());
+}
+
+void
+BBTRulerDrag::finished (GdkEvent* event, bool movement_occurred)
+{
+ if (!movement_occurred) {
+ return;
+ }
+
+ TempoMap& map (_editor->session()->tempo_map());
+
+ XMLNode &after = map.get_state();
+ _editor->session()->add_command(new MementoCommand<TempoMap>(map, before_state, &after));
+ _editor->commit_reversible_command ();
+}
+
+void
+BBTRulerDrag::aborted (bool moved)
+{
+ if (moved) {
+ _editor->session()->tempo_map().set_state (*before_state, Stateful::current_state_version);
+ }
+}
+
+