editor/txmgr/nsTransactionStack.h
author David Anderson <danderson@mozilla.com>
Wed, 28 Sep 2016 13:23:48 -0700
changeset 342354 690c50d5a4ca7b55adcc6085d6dcfe00c1eeff45
parent 326563 232a786cf87fb0f68f9bda6e9316515524d2ac8a
permissions -rw-r--r--
Add a testing pref to let the GPU process restart multiple times. (bug 1305941, r=mattwoodrow)

/* -*- 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__