/* -*- Mode: IDL; 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 Communicator.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corp.
 * Portions created by the Initial Developer are Copyright (C) 1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Mike Pinkerton
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either 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 "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)
//
[uuid(fe8c5270-0c69-11db-9cd8-0800200c9a66)]
interface nsIChangeObserver : nsISupports
{
  void AttributeChanged(in nsIDocument aDocument,
                        in long aNameSpaceID,
                        in nsIContent aContent,
                        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.
//

[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