(optionally) play note(s) as they are moved around on the pitch axis (finishes #3446)

git-svn-id: svn://localhost/ardour2/branches/3.0@7782 d708f5d6-7413-0410-9779-e7cbd77b26cf

gtk2_ardour/editor_drag.cc

@@ -3722,7 +3722,14 @@ NoteDrag::motion (GdkEvent *, bool)
                 char buf[12];
                 snprintf (buf, sizeof (buf), "%s (%d)", Evoral::midi_note_name (_primary->note()->note() + dy).c_str(),
                           (int) floor (_primary->note()->note() + dy));
-		
+                
+                if (dy) {
+                        boost::shared_ptr<Evoral::Note<Evoral::MusicalTime> > 
+                                moved_note (new Evoral::Note<Evoral::MusicalTime> (*(_primary->note())));
+                        moved_note->set_note (moved_note->note() + dy);
+                        _region->play_midi_note (moved_note);
+                }
+
 		_editor->show_verbose_canvas_cursor_with (buf);
         }
 }

gtk2_ardour/midi_region_view.cc

@@ -1324,6 +1324,11 @@ MidiRegionView::play_midi_note(boost::shared_ptr<NoteType> note)
 	const double note_length_beats = (note->off_event().time() - note->on_event().time());
 	nframes_t note_length_ms = beats_to_frames(note_length_beats)
 			* (1000 / (double)route_ui->session()->nominal_frame_rate());
+
+        /* note: we probably should not be binding a shared_ptr<NoteType> 
+           here. Since its a one-shot timeout, its sort of OK, but ...
+        */
+
 	Glib::signal_timeout().connect(sigc::bind(sigc::mem_fun(this, &MidiRegionView::play_midi_note_off), note),
 			note_length_ms, G_PRIORITY_DEFAULT);
 }

gtk2_ardour/midi_region_view.h

@@ -303,7 +303,8 @@ class MidiRegionView : public RegionView
   private:
 
 	friend class EditNoteDialog;
-	
+        friend class NoteDrag;
+
 	/** Play the NoteOn event of the given note immediately
 	 * and schedule the playback of the corresponding NoteOff event.
 	 */