Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* This Source Code Form is subject to the terms of the Mozilla Public
       3             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       4             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       5             : 
       6             : #ifndef nsTransactionStack_h__
       7             : #define nsTransactionStack_h__
       8             : 
       9             : #include "nsDeque.h"
      10             : 
      11             : class nsCycleCollectionTraversalCallback;
      12             : class nsTransactionItem;
      13             : 
      14             : class nsTransactionStack : private nsDeque
      15             : {
      16             : public:
      17             :   enum Type { FOR_UNDO, FOR_REDO };
      18             : 
      19             :   explicit nsTransactionStack(Type aType);
      20             :   ~nsTransactionStack();
      21             : 
      22             :   void Push(nsTransactionItem *aTransactionItem);
      23             :   void Push(already_AddRefed<nsTransactionItem> aTransactionItem);
      24             :   already_AddRefed<nsTransactionItem> Pop();
      25             :   already_AddRefed<nsTransactionItem> PopBottom();
      26             :   already_AddRefed<nsTransactionItem> Peek();
      27             :   already_AddRefed<nsTransactionItem> GetItem(int32_t aIndex);
      28             :   void Clear();
      29          22 :   int32_t GetSize() const { return static_cast<int32_t>(nsDeque::GetSize()); }
      30           6 :   bool IsEmpty() const { return GetSize() == 0; }
      31             : 
      32           0 :   void DoUnlink() { Clear(); }
      33             :   void DoTraverse(nsCycleCollectionTraversalCallback &cb);
      34             : 
      35             : private:
      36             :   const Type mType;
      37             : };
      38             : 
      39             : #endif // nsTransactionStack_h__