1 /*
2  * Copyright (C) 2010-2015 Paul Davis <paul@linuxaudiosystems.com>
3  * Copyright (C) 2010 Carl Hetherington <carl@carlh.net>
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License along
16  * with this program; if not, write to the Free Software Foundation, Inc.,
17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18  */
19 
20 #ifndef __pbd_stateful_diff_command_h__
21 #define __pbd_stateful_diff_command_h__
22 
23 #include <boost/shared_ptr.hpp>
24 #include <boost/weak_ptr.hpp>
25 
26 #include "pbd/command.h"
27 #include "pbd/libpbd_visibility.h"
28 
29 namespace PBD
30 {
31 class StatefulDestructible;
32 class PropertyList;
33 
34 /** A Command which stores its action as the differences between the before and after
35  *  state of a Stateful object.
36  */
37 class LIBPBD_API StatefulDiffCommand : public Command
38 {
39 public:
40 	StatefulDiffCommand (boost::shared_ptr<StatefulDestructible>);
41 	StatefulDiffCommand (boost::shared_ptr<StatefulDestructible>, XMLNode const&);
42 	~StatefulDiffCommand ();
43 
44 	void operator() ();
45 	void undo ();
46 
47 	XMLNode& get_state ();
48 
49 	bool empty () const;
50 
51 private:
52 	boost::weak_ptr<Stateful> _object;  ///< the object in question
53 	PBD::PropertyList*        _changes; ///< property changes to execute this command
54 };
55 
56 }; // namespace PBD
57 
58 #endif /* __pbd_stateful_diff_command_h__ */
59