/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * The contents of this file are subject to the Netscape Public License
 * Version 1.0 (the "NPL"); you may not use this file except in
 * compliance with the NPL.  You may obtain a copy of the NPL at
 * http://www.mozilla.org/NPL/
 *
 * Software distributed under the NPL is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
 * for the specific language governing rights and limitations under the
 * NPL.
 *
 * The Initial Developer of this code under the NPL is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
 * Reserved.
 */


#include "nsEditorUtils.h"
#include "nsIDOMDocument.h"


/******************************************************************************
 * nsAutoSelectionReset
 *****************************************************************************/

nsAutoSelectionReset::nsAutoSelectionReset(nsIDOMSelection *aSel) 
{ 
  mInitialized = PR_FALSE;
  mSel = do_QueryInterface(aSel);
  if (mSel)
  {
    mSel->GetAnchorNode(getter_AddRefs(mStartNode));
    mSel->GetAnchorOffset(&mStartOffset);
    mSel->GetFocusNode(getter_AddRefs(mEndNode));
    mSel->GetFocusOffset(&mEndOffset);
    if (mStartNode && mEndNode)
      mInitialized = PR_TRUE;
  }
}

nsAutoSelectionReset::~nsAutoSelectionReset()
{
  if (mSel && mInitialized)
  {
    // make sure that mStartNode and mEndNode are still in a document
    nsCOMPtr<nsIDOMDocument> docStart;
    nsresult res = mStartNode->GetOwnerDocument(getter_AddRefs(docStart)); 
    if (NS_SUCCEEDED(res) && docStart)
    {
      nsCOMPtr<nsIDOMDocument> docEnd;
      res = mEndNode->GetOwnerDocument(getter_AddRefs(docEnd)); 
      if (NS_SUCCEEDED(res) && (docStart == docEnd))
      {
        // restore original selection
        mSel->Collapse(mStartNode, mStartOffset);
        mSel->Extend(mEndNode, mEndOffset);
      }
    }
  }
}