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/* -*- Mode: C++; 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.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
 * 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 ***** */

#ifndef nsIEditorSupport_h__
#define nsIEditorSupport_h__
#include "nsISupports.h"

class nsIDOMNode;

/*
Private Editor interface for a class that can provide helper functions
*/

#define NS_IEDITORSUPPORT_IID \
{/* 89b999b0-c529-11d2-86da-000064657374*/ \
0x89b999b0, 0xc529, 0x11d2, \
{0x86, 0xda, 0x0, 0x0, 0x64, 0x65, 0x73, 0x74} }


/**
 */
class nsIEditorSupport  : public nsISupports {

public:

  NS_DECLARE_STATIC_IID_ACCESSOR(NS_IEDITORSUPPORT_IID)

  /** 
   * SplitNode() creates a new node identical to an existing node, and split the contents between the two nodes
   * @param aExistingRightNode   the node to split.  It will become the new node's next sibling.
   * @param aOffset              the offset of aExistingRightNode's content|children to do the split at
   * @param aNewLeftNode         [OUT] the new node resulting from the split, becomes aExistingRightNode's previous sibling.
   * @param aParent              the parent of aExistingRightNode
   */
  NS_IMETHOD SplitNodeImpl(nsIDOMNode * aExistingRightNode,
                           PRInt32      aOffset,
                           nsIDOMNode * aNewLeftNode,
                           nsIDOMNode * aParent)=0;

  /** 
   * JoinNodes() takes 2 nodes and merge their content|children.
   * @param aNodeToKeep   The node that will remain after the join.
   * @param aNodeToJoin   The node that will be joined with aNodeToKeep.
   *                      There is no requirement that the two nodes be of the same type.
   * @param aParent       The parent of aExistingRightNode
   * @param aNodeToKeepIsFirst  if PR_TRUE, the contents|children of aNodeToKeep come before the
   *                            contents|children of aNodeToJoin, otherwise their positions are switched.
   */
  NS_IMETHOD JoinNodesImpl(nsIDOMNode *aNodeToKeep,
                           nsIDOMNode  *aNodeToJoin,
                           nsIDOMNode  *aParent,
                           PRBool       aNodeToKeepIsFirst)=0;

  static nsresult GetChildOffset(nsIDOMNode *aChild, nsIDOMNode *aParent, PRInt32 &aOffset);
  


};

NS_DEFINE_STATIC_IID_ACCESSOR(nsIEditorSupport, NS_IEDITORSUPPORT_IID)

#endif //nsIEditorSupport_h__