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/*
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.
*/
#ifndef __pbd_stateful_diff_command_h__
#define __pbd_stateful_diff_command_h__
#include <boost/shared_ptr.hpp>
#include <boost/weak_ptr.hpp>
#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 (boost::shared_ptr<Stateful>);
StatefulDiffCommand (boost::shared_ptr<Stateful>, XMLNode const &);
~StatefulDiffCommand ();
void operator() ();
void undo ();
XMLNode& get_state ();
private:
boost::weak_ptr<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
};
};
#endif /* __pbd_stateful_diff_command_h__ */
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