decouple midi region note range and height from midi streamview.

	- this allows a midi region drag to update the visible notes
	  correctly while crossing MIDI streamviews with a differing
	  note range.
	  as a side effect, fixes a bug where changing
	  note range on a track did not draw some notes
	  (apply_note_range redisplays the model).

1 files changed, 8 insertions, 0 deletions

diff --git a/gtk2_ardour/midi_region_view.h b/gtk2_ardour/midi_region_view.h
index 9c85401593..93ce1e5011 100644
--- a/gtk2_ardour/midi_region_view.h
+++ b/gtk2_ardour/midi_region_view.h
@@ -355,6 +355,7 @@ private:
 
 	friend class MidiRubberbandSelectDrag;
 	friend class MidiVerticalSelectDrag;
+	friend class NoteDrag;
 	friend class NoteCreateDrag;
 	friend class HitCreateDrag;
 
@@ -519,6 +520,13 @@ private:
 
         ARDOUR::ChannelMode get_channel_mode() const;
         uint16_t get_selected_channels () const;
+
+	inline double contents_height() const { return (_height - TimeAxisViewItem::NAME_HIGHLIGHT_SIZE - 2); }
+	inline double contents_note_range () const { return (double)(_current_range_max - _current_range_min + 1); }
+	inline double note_height() const { return contents_height() / contents_note_range(); }
+
+	double note_to_y (uint8_t note) const;
+	uint8_t y_to_note (double y) const;
 };