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- /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
- /* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is mozilla.org code.
- *
- * The Initial Developer of the Original Code is
- * Netscape Communications Corporation.
- * Portions created by the Initial Developer are Copyright (C) 1998
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either of the GNU General Public License Version 2 or later (the "GPL"),
- * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
- *
- * ***** END LICENSE BLOCK ***** */
-
- #include "nsISupports.idl"
- #include "nsITransaction.idl"
- #include "nsITransactionList.idl"
- #include "nsITransactionListener.idl"
-
- %{ C++
-
- #define NS_TRANSACTIONMANAGER_CONTRACTID "@mozilla.org/transactionmanager;1"
-
- %} C++
-
- /**
- * The nsITransactionManager interface.
- * <P>
- * This interface is implemented by an object that wants to
- * manage/track transactions.
- */
- [scriptable, uuid(58e330c2-7b48-11d2-98b9-00805f297d89)]
- interface nsITransactionManager : nsISupports
- {
- /**
- * Calls a transaction's doTransaction() method, then pushes it on the
- * undo stack.
- * <P>
- * This method calls the transaction's AddRef() method.
- * The transaction's Release() method will be called when the undo or redo
- * stack is pruned or when the transaction manager is destroyed.
- * @param aTransaction the transaction to do.
- */
- void doTransaction(in nsITransaction aTransaction);
-
- /**
- * Pops the topmost transaction on the undo stack, calls it's
- * undoTransaction() method, then pushes it on the redo stack.
- */
- void undoTransaction();
-
- /**
- * Pops the topmost transaction on the redo stack, calls it's
- * redoTransaction() method, then pushes it on the undo stack.
- */
- void redoTransaction();
-
- /**
- * Clears the undo and redo stacks.
- */
- void clear();
-
- /**
- * Turns on the transaction manager's batch mode, forcing all transactions
- * executed by the transaction manager's doTransaction() method to be
- * aggregated together until EndBatch() is called. This mode allows an
- * application to execute and group together several independent transactions
- * so they can be undone with a single call to undoTransaction().
- */
- void beginBatch();
-
- /**
- * Turns off the transaction manager's batch mode.
- */
- void endBatch();
-
- /**
- * The number of items on the undo stack.
- */
- readonly attribute long numberOfUndoItems;
-
- /**
- * The number of items on the redo stack.
- */
- readonly attribute long numberOfRedoItems;
-
- /**
- * Sets the maximum number of transaction items the transaction manager will
- * maintain at any time. This is commonly referred to as the number of levels
- * of undo.
- * @param aMaxCount A value of -1 means no limit. A value of zero means the
- * transaction manager will execute each transaction, then immediately release
- * all references it has to the transaction without pushing it on the undo
- * stack. A value greater than zero indicates the max number of transactions
- * that can exist at any time on both the undo and redo stacks. This method
- * will prune the necessary number of transactions on the undo and redo
- * stacks if the value specified is less than the number of items that exist
- * on both the undo and redo stacks.
- */
- attribute long maxTransactionCount;
-
- /**
- * Returns an AddRef'd pointer to the transaction at the top of the
- * undo stack. Callers should be aware that this method could return
- * return a null in some implementations if there is a batch at the top
- * of the undo stack.
- */
- nsITransaction peekUndoStack();
-
- /**
- * Returns an AddRef'd pointer to the transaction at the top of the
- * redo stack. Callers should be aware that this method could return
- * return a null in some implementations if there is a batch at the top
- * of the redo stack.
- */
- nsITransaction peekRedoStack();
-
- /**
- * Returns the list of transactions on the undo stack. Note that the
- * transaction at the top of the undo stack will actually be at the
- * index 'n-1' in the list, where 'n' is the number of items in the list.
- */
- nsITransactionList getUndoList();
-
- /**
- * Returns the list of transactions on the redo stack. Note that the
- * transaction at the top of the redo stack will actually be at the
- * index 'n-1' in the list, where 'n' is the number of items in the list.
- */
- nsITransactionList getRedoList();
-
- /**
- * Adds a listener to the transaction manager's notification list. Listeners
- * are notified whenever a transaction is done, undone, or redone.
- * <P>
- * The listener's AddRef() method is called.
- * @param aListener the lister to add.
- */
- void AddListener(in nsITransactionListener aListener);
-
- /**
- * Removes a listener from the transaction manager's notification list.
- * <P>
- * The listener's Release() method is called.
- * @param aListener the lister to remove.
- */
- void RemoveListener(in nsITransactionListener aListener);
- };
-
-