1/*
2 * Copyright (C) 2009 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 UndoStack_h
32#define UndoStack_h
33
34#include "platform/heap/Handle.h"
35#include "wtf/Deque.h"
36#include "wtf/Forward.h"
37
38namespace blink {
39
40class LocalFrame;
41class UndoStep;
42
43class UndoStack FINAL : public NoBaseWillBeGarbageCollected<UndoStack> {
44    DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(UndoStack)
45public:
46    static PassOwnPtrWillBeRawPtr<UndoStack> create();
47
48    void registerUndoStep(PassRefPtrWillBeRawPtr<UndoStep>);
49    void registerRedoStep(PassRefPtrWillBeRawPtr<UndoStep>);
50    void didUnloadFrame(const LocalFrame&);
51    bool canUndo() const;
52    bool canRedo() const;
53    void undo();
54    void redo();
55
56    void trace(Visitor*);
57
58private:
59    UndoStack();
60
61    typedef WillBeHeapDeque<RefPtrWillBeMember<UndoStep> > UndoStepStack;
62
63    void filterOutUndoSteps(UndoStepStack&, const LocalFrame&);
64
65    bool m_inRedo;
66    UndoStepStack m_undoStack;
67    UndoStepStack m_redoStack;
68};
69
70} // namespace blink
71
72#endif
73