1/*
2 * Copyright (C) 2012 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#ifndef InspectorHistory_h
32#define InspectorHistory_h
33
34#include "ExceptionCode.h"
35
36#include <wtf/OwnPtr.h>
37#include <wtf/Vector.h>
38#include <wtf/text/WTFString.h>
39
40namespace WebCore {
41
42class ContainerNode;
43class Element;
44class Node;
45
46#if ENABLE(INSPECTOR)
47
48class InspectorHistory {
49    WTF_MAKE_NONCOPYABLE(InspectorHistory); WTF_MAKE_FAST_ALLOCATED;
50public:
51    class Action {
52        WTF_MAKE_FAST_ALLOCATED;
53    public:
54        Action(const String& name);
55        virtual ~Action();
56        virtual String toString();
57
58        virtual String mergeId();
59        virtual void merge(PassOwnPtr<Action>);
60
61        virtual bool perform(ExceptionCode&) = 0;
62
63        virtual bool undo(ExceptionCode&) = 0;
64        virtual bool redo(ExceptionCode&) = 0;
65
66        virtual bool isUndoableStateMark();
67    private:
68        String m_name;
69    };
70
71    InspectorHistory();
72    virtual ~InspectorHistory();
73
74    bool perform(PassOwnPtr<Action>, ExceptionCode&);
75    void markUndoableState();
76
77    bool undo(ExceptionCode&);
78    bool redo(ExceptionCode&);
79    void reset();
80
81private:
82    Vector<OwnPtr<Action> > m_history;
83    size_t m_afterLastActionIndex;
84};
85
86#endif // ENABLE(INSPECTOR)
87
88} // namespace WebCore
89
90#endif // !defined(InspectorHistory_h)
91