Basic canvas note event handling framework.

Note dragging (non-functional).


git-svn-id: svn://localhost/ardour2/trunk@2187 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 59 insertions, 0 deletions

diff --git a/gtk2_ardour/canvas-midi-event.h b/gtk2_ardour/canvas-midi-event.h
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+++ b/gtk2_ardour/canvas-midi-event.h
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+/*
+    Copyright (C) 2007 Paul Davis 
+    Author: Dave Robillard
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#ifndef __gtk_ardour_canvas_midi_event_h__
+#define __gtk_ardour_canvas_midi_event_h__
+
+#include "simplerect.h"
+
+class Editor;
+class MidiRegionView;
+
+namespace Gnome {
+namespace Canvas {
+
+
+/** This manages all the event handling for any MIDI event on the canvas.
+ *
+ * This is not actually a canvas item itself to avoid the dreaded diamond,
+ * since various types of canvas items (Note (rect), Hit (diamond), etc)
+ * need to share this functionality but can't share an ancestor.
+ *
+ * Note: Because of this, derived classes need to manually bounce events to
+ * on_event, it won't happen automatically.
+ */
+class CanvasMidiEvent {
+public:
+	CanvasMidiEvent(MidiRegionView& region, Item* item);
+	virtual ~CanvasMidiEvent() {} 
+
+	virtual bool on_event(GdkEvent* ev);
+
+private:
+	enum State { None, Pressed, Dragging };
+
+	MidiRegionView& _region;
+	Item* const     _item;
+	State           _state;
+};
+
+} // namespace Gnome
+} // namespace Canvas
+
+#endif /* __gtk_ardour_canvas_midi_event_h__ */