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/*
* Copyright (C) 2009 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef UndoStack_h
#define UndoStack_h
#include "platform/heap/Handle.h"
#include "wtf/Deque.h"
#include "wtf/Forward.h"
namespace blink {
class LocalFrame;
class UndoStep;
// |UndoStack| is owned by and always 1:1 to |Editor|. Since |Editor| is 1:1 to
// |LocalFrame|, |UndoStack| is also 1:1 to |LocalFrame|.
class UndoStack final : public GarbageCollected<UndoStack> {
WTF_MAKE_NONCOPYABLE(UndoStack);
public:
static UndoStack* create();
void registerUndoStep(UndoStep*);
void registerRedoStep(UndoStep*);
bool canUndo() const;
bool canRedo() const;
void undo();
void redo();
void clear();
DECLARE_TRACE();
private:
UndoStack();
typedef HeapDeque<Member<UndoStep>> UndoStepStack;
bool m_inRedo;
UndoStepStack m_undoStack;
UndoStepStack m_redoStack;
};
} // namespace blink
#endif
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