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 "platform/heap/Handle.h"
35#include "wtf/RefPtr.h"
36#include "wtf/Vector.h"
37#include "wtf/text/WTFString.h"
38
39namespace blink {
40
41class ExceptionState;
42
43class InspectorHistory FINAL : public NoBaseWillBeGarbageCollected<InspectorHistory> {
44    WTF_MAKE_NONCOPYABLE(InspectorHistory);
45    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
46public:
47    class Action : public RefCountedWillBeGarbageCollectedFinalized<Action> {
48        WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
49    public:
50        explicit Action(const String& name);
51        virtual ~Action();
52        virtual void trace(Visitor*);
53        virtual String toString();
54
55        virtual String mergeId();
56        virtual void merge(PassRefPtrWillBeRawPtr<Action>);
57
58        virtual bool perform(ExceptionState&) = 0;
59
60        virtual bool undo(ExceptionState&) = 0;
61        virtual bool redo(ExceptionState&) = 0;
62
63        virtual bool isUndoableStateMark();
64    private:
65        String m_name;
66    };
67
68    InspectorHistory();
69    void trace(Visitor*);
70
71    bool perform(PassRefPtrWillBeRawPtr<Action>, ExceptionState&);
72    void markUndoableState();
73
74    bool undo(ExceptionState&);
75    bool redo(ExceptionState&);
76    void reset();
77
78private:
79    WillBeHeapVector<RefPtrWillBeMember<Action> > m_history;
80    size_t m_afterLastActionIndex;
81};
82
83
84} // namespace blink
85
86#endif // !defined(InspectorHistory_h)
87