2 Copyright (C) 2006 Hans Fugal & Paul Davis
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 $Id: /local/undo/libs/pbd3/pbd/undo.h 132 2006-06-29T18:45:16.609763Z fugalh $
21 #ifndef __lib_pbd_memento_command_h__
22 #define __lib_pbd_memento_command_h__
24 #include <pbd/command.h>
25 #include <pbd/xml++.h>
26 #include <sigc++/slot.h>
29 /** This command class is initialized with before and after mementos
30 * (from Stateful::get_state()), so undo becomes restoring the before
31 * memento, and redo is restoring the after memento.
33 template <class obj_T>
34 class MementoCommand : public Command
37 MementoCommand(XMLNode &state);
38 MementoCommand(obj_T &obj,
42 : obj(obj), before(before), after(after) {}
43 void operator() () { obj.set_state(after); }
44 void undo() { obj.set_state(before); }
45 virtual XMLNode &get_state()
47 XMLNode *node = new XMLNode("MementoCommand");
48 node->add_property("obj_id", obj.id().to_s());
49 node->add_property("type_name", typeid(obj).name());
50 node->add_child_copy(before);
51 node->add_child_copy(after);
56 XMLNode &before, &after;
59 template <class obj_T>
60 class MementoUndoCommand : public Command
63 MementoUndoCommand(XMLNode &state);
64 MementoUndoCommand(obj_T &obj,
66 : obj(obj), before(before) {}
67 void operator() () { /* noop */ }
68 void undo() { obj.set_state(before); }
69 virtual XMLNode &get_state()
71 XMLNode *node = new XMLNode("MementoUndoCommand");
72 node->add_property("obj_id", obj.id().to_s());
73 node->add_property("type_name", typeid(obj).name());
74 node->add_child_copy(before);
82 template <class obj_T>
83 class MementoRedoCommand : public Command
86 MementoRedoCommand(XMLNode &state);
87 MementoRedoCommand(obj_T &obj,
89 : obj(obj), after(after) {}
90 void operator() () { obj.set_state(after); }
91 void undo() { /* noop */ }
92 virtual XMLNode &get_state()
94 XMLNode *node = new XMLNode("MementoRedoCommand");
95 node->add_property("obj_id", obj.id().to_s());
96 node->add_property("type_name", typeid(obj).name());
97 node->add_child_copy(after);
105 #endif // __lib_pbd_memento_h__