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-rw-r--r--kaddressbook/undo.cpp119
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1/*
2 This file is part of KAddressBook.
3 Copyright (C) 1999 Don Sanders <sanders@kde.org>
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
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18
19 As a special exception, permission is given to link this program
20 with any edition of Qt, and distribute the resulting executable,
21 without including the source code for Qt in the source distribution.
22*/
23
24#include "undo.h"
25
26///////////////////////////////
27// StackBase
28
29void StackBase::push(Command *c)
30{
31 mCommandStack.push(c);
32 emit changed();
33}
34
35bool StackBase::isEmpty()
36{
37 return mCommandStack.isEmpty();
38}
39
40Command *StackBase::top()
41{
42 return mCommandStack.top();
43}
44
45void StackBase::clear()
46{
47 mCommandStack.clear();
48 emit changed();
49}
50
51Command *StackBase::pop()
52{
53 Command *c = mCommandStack.pop();
54 if (c)
55 emit changed();
56
57 return c;
58}
59
60///////////////////////////////
61// UndoStack
62
63UndoStack* UndoStack::instance_ = 0;
64
65UndoStack::UndoStack()
66 : StackBase()
67{
68 // setAutoDelete( true );
69}
70
71UndoStack* UndoStack::instance()
72{
73 if (!instance_)
74 instance_ = new UndoStack();
75 return instance_;
76}
77
78void UndoStack::undo()
79{
80 if (isEmpty())
81 return;
82
83 Command *command = pop();
84 command->undo();
85
86 RedoStack::instance()->push( command );
87}
88
89////////////////////
90// RedoStack
91
92RedoStack* RedoStack::instance_ = 0;
93
94RedoStack::RedoStack()
95{
96 mCommandStack.setAutoDelete( true );
97}
98
99RedoStack* RedoStack::instance()
100{
101 if (!instance_)
102 instance_ = new RedoStack();
103 return instance_;
104}
105
106void RedoStack::redo()
107{
108 Command *command;
109 if (isEmpty())
110 return;
111
112 command = pop();
113 command->redo();
114 UndoStack::instance()->push( command );
115}
116
117#ifndef KAB_EMBEDDED
118#include "undo.moc"
119#endif //KAB_EMBEDDED