make it possible for canvas patch changes to receive kbd events, and along the way clean up a couple of related issues, providing noevent-pixbuf (which we should probably use for regionview names too)

git-svn-id: svn://localhost/ardour2/branches/3.0@12745 d708f5d6-7413-0410-9779-e7cbd77b26cf

gtk2_ardour/canvas-noevent-pixbuf.h

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2009 Paul Davis <paul@linuxaudiosystems.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ */
+
+#ifndef __gtk2_ardour_canvas_noevent_pixbuf_h__
+#define __gtk2_ardour_canvas_noevent_pixbuf_h__
+
+#include <libgnomecanvasmm/pixbuf.h>
+
+namespace Gnome { namespace Canvas {
+
+class NoEventPixbuf : public Pixbuf
+{
+  public:
+    NoEventPixbuf(Group& parent) : Pixbuf (parent) {}
+
+    double point_vfunc(double, double, int, int, GnomeCanvasItem**) {
+	    /* return a huge value to tell the canvas that we're never the item for an event */
+	    return 9999999999999.0;
+    }
+};
+
+} } /* namespaces */
+
+#endif /* __gtk2_ardour_canvas_noevent_pixbuf_h__ */