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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 mozilla_TransactionStack_h
#define mozilla_TransactionStack_h
#include "mozilla/AlreadyAddRefed.h"
#include "nsDeque.h"
class nsCycleCollectionTraversalCallback;
namespace mozilla {
class TransactionItem;
class TransactionStack : private nsRefPtrDeque<TransactionItem> {
public:
enum Type { FOR_UNDO, FOR_REDO };
explicit TransactionStack(Type aType);
~TransactionStack();
void Push(TransactionItem* aTransactionItem);
void Push(already_AddRefed<TransactionItem> aTransactionItem);
already_AddRefed<TransactionItem> Pop();
already_AddRefed<TransactionItem> PopBottom();
already_AddRefed<TransactionItem> Peek() const;
already_AddRefed<TransactionItem> GetItemAt(size_t aIndex) const;
void Clear();
size_t GetSize() const { return nsRefPtrDeque<TransactionItem>::GetSize(); }
bool IsEmpty() const { return GetSize() == 0; }
void DoUnlink() { Clear(); }
void DoTraverse(nsCycleCollectionTraversalCallback& cb);
private:
const Type mType;
};
} // namespace mozilla
#endif // mozilla_TransactionStack_h
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