1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
/*
Copyright (C) 2006 Hans Fugal & 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.
$Id: /local/undo/libs/pbd3/pbd/undo.h 132 2006-06-29T18:45:16.609763Z fugalh $
*/
#ifndef __lib_pbd_memento_command_h__
#define __lib_pbd_memento_command_h__
#include <pbd/command.h>
#include <pbd/xml++.h>
#include <sigc++/slot.h>
#include <typeinfo>
/** This command class is initialized with before and after mementos
* (from Stateful::get_state()), so undo becomes restoring the before
* memento, and redo is restoring the after memento.
*/
template <class obj_T>
class MementoCommand : public Command
{
public:
MementoCommand(XMLNode &state);
MementoCommand(obj_T &obj,
XMLNode &before,
XMLNode &after
)
: obj(obj), before(before), after(after) {}
void operator() () { obj.set_state(after); }
void undo() { obj.set_state(before); }
virtual XMLNode &get_state()
{
XMLNode *node = new XMLNode("MementoCommand");
node->add_property("obj_id", obj.id().to_s());
node->add_property("type_name", typeid(obj).name());
node->add_child_copy(before);
node->add_child_copy(after);
return *node;
}
protected:
obj_T &obj;
XMLNode &before, &after;
};
template <class obj_T>
class MementoUndoCommand : public Command
{
public:
MementoUndoCommand(XMLNode &state);
MementoUndoCommand(obj_T &obj,
XMLNode &before)
: obj(obj), before(before) {}
void operator() () { /* noop */ }
void undo() { obj.set_state(before); }
virtual XMLNode &get_state()
{
XMLNode *node = new XMLNode("MementoUndoCommand");
node->add_property("obj_id", obj.id().to_s());
node->add_property("type_name", typeid(obj).name());
node->add_child_copy(before);
return *node;
}
protected:
obj_T &obj;
XMLNode &before;
};
template <class obj_T>
class MementoRedoCommand : public Command
{
public:
MementoRedoCommand(XMLNode &state);
MementoRedoCommand(obj_T &obj,
XMLNode &after)
: obj(obj), after(after) {}
void operator() () { obj.set_state(after); }
void undo() { /* noop */ }
virtual XMLNode &get_state()
{
XMLNode *node = new XMLNode("MementoRedoCommand");
node->add_property("obj_id", obj.id().to_s());
node->add_property("type_name", typeid(obj).name());
node->add_child_copy(after);
return *node;
}
protected:
obj_T &obj;
XMLNode &after;
};
#endif // __lib_pbd_memento_h__
|
