1 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 : /* ***** BEGIN LICENSE BLOCK *****
3 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
4 : *
5 : * The contents of this file are subject to the Mozilla Public License Version
6 : * 1.1 (the "License"); you may not use this file except in compliance with
7 : * the License. You may obtain a copy of the License at
8 : * http://www.mozilla.org/MPL/
9 : *
10 : * Software distributed under the License is distributed on an "AS IS" basis,
11 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12 : * for the specific language governing rights and limitations under the
13 : * License.
14 : *
15 : * The Original Code is mozilla.org code.
16 : *
17 : * The Initial Developer of the Original Code is
18 : * Netscape Communications Corporation.
19 : * Portions created by the Initial Developer are Copyright (C) 1998
20 : * the Initial Developer. All Rights Reserved.
21 : *
22 : * Contributor(s):
23 : *
24 : * Alternatively, the contents of this file may be used under the terms of
25 : * either of the GNU General Public License Version 2 or later (the "GPL"),
26 : * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
27 : * in which case the provisions of the GPL or the LGPL are applicable instead
28 : * of those above. If you wish to allow use of your version of this file only
29 : * under the terms of either the GPL or the LGPL, and not to allow others to
30 : * use your version of this file under the terms of the MPL, indicate your
31 : * decision by deleting the provisions above and replace them with the notice
32 : * and other provisions required by the GPL or the LGPL. If you do not delete
33 : * the provisions above, a recipient may use your version of this file under
34 : * the terms of any one of the MPL, the GPL or the LGPL.
35 : *
36 : * ***** END LICENSE BLOCK ***** */
37 :
38 : #ifndef nsTransactionStack_h__
39 : #define nsTransactionStack_h__
40 :
41 : #include "nsDeque.h"
42 : #include "nsCOMPtr.h"
43 :
44 : class nsTransactionItem;
45 :
46 : class nsTransactionStack
47 : {
48 : public:
49 : enum Type { FOR_UNDO, FOR_REDO };
50 :
51 : explicit nsTransactionStack(Type aType);
52 : ~nsTransactionStack();
53 :
54 : void Push(nsTransactionItem *aTransactionItem);
55 : already_AddRefed<nsTransactionItem> Pop();
56 : already_AddRefed<nsTransactionItem> PopBottom();
57 : already_AddRefed<nsTransactionItem> Peek();
58 : already_AddRefed<nsTransactionItem> GetItem(PRInt32 aIndex);
59 : void Clear();
60 4706 : PRInt32 GetSize() { return mQue.GetSize(); }
61 :
62 0 : void DoUnlink() { Clear(); }
63 : void DoTraverse(nsCycleCollectionTraversalCallback &cb);
64 :
65 : private:
66 : nsDeque mQue;
67 : const Type mType;
68 : };
69 :
70 : #endif // nsTransactionStack_h__
|