editor/txmgr/idl/nsITransactionList.idl
author Mats Palmgren <mats.palmgren@bredband.net>
Tue, 16 Dec 2008 12:26:42 +0100
changeset 22837 cdf705dea843cebbc98d6baf5ace1135260eeb8a
parent 4088 88543a3350b5324b54d895d35327c508587a2995
child 94475 f4157e8c410708d76703f19e4dfb61859bfe32d8
permissions -rw-r--r--
Add a few missing null-checks. Return error code from GetRuleLine() when it fails. b=462787 r+sr=dbaron

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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#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);
};