71 lines
2.6 KiB
Plaintext
71 lines
2.6 KiB
Plaintext
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsISupports.idl"
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interface nsITransaction;
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/*
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* The nsITransactionList interface.
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* <P>
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* The implementation for this interface is provided by the Transaction Manager.
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* This interface provides a mechanism for accessing the transactions on the
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* Undo or Redo stacks as well as any auto-aggregated children that a
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* transaction may have.
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*/
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[scriptable, uuid(d007ceff-c978-486a-b697-384ca01997be)]
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interface nsITransactionList : nsISupports
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{
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/**
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* The number of transactions contained in this list.
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*/
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readonly attribute long numItems;
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/**
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* itemIsBatch() returns true if the item at aIndex is a batch. Note that
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* currently there is no requirement for a TransactionManager implementation
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* to associate a toplevel nsITransaction with a batch so it is possible for
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* itemIsBatch() to return true and getItem() to return null. However, you
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* can still access the transactions contained in the batch with a call to
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* getChildListForItem().
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* @param aIndex The index of the item in the list.
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*/
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boolean itemIsBatch(in long aIndex);
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/**
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* getItem() returns the transaction at the given index in the list. Note that
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* a null can be returned here if the item is a batch. The transaction
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* returned is AddRef'd so it is up to the caller to Release the transaction
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* when it is done.
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* @param aIndex The index of the item in the list.
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*/
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nsITransaction getItem(in long aIndex);
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/**
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* getData() returns the data (of type nsISupports array) associated with
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* the transaction list.
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*/
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void getData(in long aIndex, [optional] out unsigned long aLength,
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[array, size_is(aLength), retval] out nsISupports aData);
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/**
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* getNumChildrenForItem() returns the number of child (auto-aggreated)
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* transactions the item at aIndex has.
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* @param aIndex The index of the item in the list.
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*/
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long getNumChildrenForItem(in long aIndex);
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/**
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* getChildListForItem() returns the list of children associated with the
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* item at aIndex. Implementations may return null if there are no children,
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* or an empty list. The list returned is AddRef'd so it is up to the caller
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* to Release the transaction when it is done.
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* @param aIndex The index of the item in the list.
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*/
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nsITransactionList getChildListForItem(in long aIndex);
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};
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