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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsTransactionStack_h__
#define nsTransactionStack_h__
#include "nsDeque.h"
class nsCycleCollectionTraversalCallback;
class nsTransactionItem;
class nsTransactionStack : private nsDeque
{
public:
enum Type { FOR_UNDO, FOR_REDO };
explicit nsTransactionStack(Type aType);
~nsTransactionStack();
void Push(nsTransactionItem *aTransactionItem);
void Push(already_AddRefed<nsTransactionItem> aTransactionItem);
already_AddRefed<nsTransactionItem> Pop();
already_AddRefed<nsTransactionItem> PopBottom();
already_AddRefed<nsTransactionItem> Peek();
already_AddRefed<nsTransactionItem> GetItem(int32_t aIndex);
void Clear();
int32_t GetSize() const { return static_cast<int32_t>(nsDeque::GetSize()); }
bool IsEmpty() const { return GetSize() == 0; }
void DoUnlink() { Clear(); }
void DoTraverse(nsCycleCollectionTraversalCallback &cb);
private:
const Type mType;
};
#endif // nsTransactionStack_h__
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