Add missing files from previous commit.

git-svn-id: svn://localhost/ardour2/branches/3.0@6665 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 47 insertions, 0 deletions

diff --git a/libs/pbd/pbd/stateful_diff_command.h b/libs/pbd/pbd/stateful_diff_command.h
new file mode 100644
index 0000000000..b02d7a669e
--- /dev/null
+++ b/libs/pbd/pbd/stateful_diff_command.h
@@ -0,0 +1,47 @@
+/*
+    Copyright (C) 2010 Paul Davis 
+
+    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.
+
+*/
+
+#include "pbd/command.h"
+
+namespace PBD
+{
+
+class Stateful;	
+
+/** A Command which stores its action as the differences between the before and after
+ *  state of a Stateful object.
+ */
+class StatefulDiffCommand : public Command
+{
+public:
+	StatefulDiffCommand (Stateful* s);
+	~StatefulDiffCommand ();
+
+	void operator() ();
+	void undo ();
+
+	XMLNode& get_state ();
+
+private:
+	Stateful* _object; ///< the object in question
+	XMLNode* _before; ///< XML node containing the previous values of XML properties which changed
+	XMLNode* _after; ///< XML node containing the new values of XML properties which changed
+};
+
+};