/* -*- 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
