gecko/editor/txmgr/idl/nsITransactionList.idl

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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
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* ***** END LICENSE BLOCK ***** */
#include "nsISupports.idl"
interface nsITransaction;
/*
* The nsITransactionList interface.
* <P>
* The implementation for this interface is provided by the Transaction Manager.
* This interface provides a mechanism for accessing the transactions on the
* Undo or Redo stacks as well as any auto-aggregated children that a
* transaction may have.
*/
[scriptable, uuid(97f863f3-f886-11d4-9d39-0060b0f8baff)]
interface nsITransactionList : nsISupports
{
/**
* The number of transactions contained in this list.
*/
readonly attribute long numItems;
/**
* itemIsBatch() returns true if the item at aIndex is a batch. Note that
* currently there is no requirement for a TransactionManager implementation
* to associate a toplevel nsITransaction with a batch so it is possible for
* itemIsBatch() to return true and getItem() to return null. However, you
* can still access the transactions contained in the batch with a call to
* getChildListForItem().
* @param aIndex The index of the item in the list.
*/
boolean itemIsBatch(in long aIndex);
/**
* getItem() returns the transaction at the given index in the list. Note that
* a null can be returned here if the item is a batch. The transaction
* returned is AddRef'd so it is up to the caller to Release the transaction
* when it is done.
* @param aIndex The index of the item in the list.
*/
nsITransaction getItem(in long aIndex);
/**
* getNumChildrenForItem() returns the number of child (auto-aggreated)
* transactions the item at aIndex has.
* @param aIndex The index of the item in the list.
*/
long getNumChildrenForItem(in long aIndex);
/**
* getChildListForItem() returns the list of children associated with the
* item at aIndex. Implementations may return null if there are no children,
* or an empty list. The list returned is AddRef'd so it is up to the caller
* to Release the transaction when it is done.
* @param aIndex The index of the item in the list.
*/
nsITransactionList getChildListForItem(in long aIndex);
};