/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * 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 Communicator.
 * 
 * The Initial Developer of the Original Code is Netscape Communications
 * Corp.  Portions created by Netscape are Copyright (C) 1999 Netscape 
 * Communications Corp.  All Rights Reserved.
 * 
 * Contributor(s): 
 *   Mike Pinkerton
 */

#include "nsISupports.idl"
#include "nsIAtom.idl"


interface nsIContent;
interface nsIDocument;


//
// nsIChangeObserver
//
// Something that wants to be alerted to changes in attributes or changes in
// its corresponding content object.
// (NOTE: If we need more things, we can add them later)
//
[scriptable, uuid(d8cf3bd0-1dd1-11b2-a837-fec5f865b071)]
interface nsIChangeObserver : nsISupports
{
  void AttributeChanged ( in nsIDocument aDocument,
                          in long aNameSpaceID, in nsIAtom aAttribute ) ;

  void ContentRemoved ( in nsIDocument aDocument, in nsIContent aChild, 
                          in long aIndexInContainer ) ;
                          
  void ContentInserted ( in nsIDocument aDocument, in nsIContent aChild, 
                          in long aIndexInContainer ) ;
  
}; // nsIChangeObserver


//
// nsIChangeManager
//
// A central manager for registering and unregistering objects that want
// to be notified when content objects change or children added/removed, etc.
//
// We use a central manager to redirect for performance reasons, to avoid
// every meny/item from getting a call when any change to the document happens.
//

[scriptable, uuid(fb31c7e0-1dd1-11b2-8a61-f4697ef53c88)]
interface nsIChangeManager : nsISupports
{
  void Register ( in nsIContent aContent, in nsIChangeObserver aMenuObject ) ;
  void Unregister ( in nsIContent aContent ) ;
  
  nsIChangeObserver Lookup ( in nsIContent aContent ) ;
  
}; // nsPIChangeManager