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/* -*- Mode: C++; tab-width: 4; 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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 * the provisions above, a recipient may use your version of this file under
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 * ***** END LICENSE BLOCK ***** */

#ifndef __nsIContentIterator_h___
#define __nsIContentIterator_h___

#include "nsISupports.h"

class nsIContent;
class nsIDOMRange;

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{0x93, 0x2e, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32} }

class nsIContentIterator : public nsISupports

  /* Initializes an iterator for the subtree rooted by the node aRoot
  virtual nsresult Init(nsIContent* aRoot) = 0;

  /* Initializes an iterator for the subtree defined by the range aRange
  virtual nsresult Init(nsIDOMRange* aRange) = 0;

  /** First will reset the list.
  virtual void First() = 0;

  /** Last will reset the list to the end.
  virtual void Last() = 0;

  /** Next will advance the list.
  virtual void Next() = 0;

  /** Prev will decrement the list.
  virtual void Prev() = 0;

  /** CurrentItem will return the current item, or null if the list is empty
   *  @return the current node
  virtual nsIContent *GetCurrentNode() = 0;

  /** return if the collection is at the end. that is the beginning following a call to Prev
   *  and it is the end of the list following a call to next
   *  @return if the iterator is done.
  virtual PRBool IsDone() = 0;

  /** PositionAt will position the iterator to the supplied node
  virtual nsresult PositionAt(nsIContent* aCurNode) = 0;


#endif // __nsIContentIterator_h___

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