gecko/content/base/public/nsINodeList.h

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * 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 Mozilla.com.
 * Portions created by the Initial Developer are Copyright (C) 2008
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *         Boris Zbarsky <bzbarsky@mit.edu> (Original Author)
 *
 * 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"),
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#ifndef nsINodeList_h___
#define nsINodeList_h___

#include "nsIDOMNodeList.h"
#include "nsWrapperCache.h"

class nsINode;
class nsIContent;

// IID for the nsINodeList interface
#define NS_INODELIST_IID \
{ 0xa842c1b5, 0x9a6f, 0x4afa, \
 { 0x9c, 0x1c, 0xf5, 0xf7, 0xdc, 0x70, 0x82, 0xd9 } }

/**
 * An internal interface that allows QI-less getting of nodes from
 * node lists and reasonably fast indexOf.
 */
class nsINodeList : public nsIDOMNodeList,
                    public nsWrapperCache
{
public:
  NS_DECLARE_STATIC_IID_ACCESSOR(NS_INODELIST_IID)

  /**
   * Get the node at the index.  Returns null if the index is out of bounds
   */
  virtual nsIContent* GetNodeAt(PRUint32 aIndex) = 0;

  /**
   * Get the index of the given node in the list.  Will return -1 if the node
   * is not in the list.
   */
  virtual PRInt32 IndexOf(nsIContent* aContent) = 0;

  /**
   * Get the root node for this nodelist.
   */
  virtual nsINode* GetParentObject() = 0;
};

#define NS_NODELIST_OFFSET_AND_INTERFACE_TABLE_BEGIN(_class)                  \
  NS_OFFSET_AND_INTERFACE_TABLE_BEGIN_AMBIGUOUS(_class, nsINodeList)

NS_DEFINE_STATIC_IID_ACCESSOR(nsINodeList, NS_INODELIST_IID)

#endif /* nsINodeList_h___ */