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/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * 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 the Mozilla browser.
 * 
 * The Initial Developer of the Original Code is Netscape
 * Communications, Inc.  Portions created by Netscape are
 * Copyright (C) 1999, Mozilla.  All Rights Reserved.
 * 
 * Contributor(s):
 *   Travis Bogard <travis@netscape.com>
 *   Steve Clark <buster@netscape.com>
 */

#include "nsISupports.idl"

/**
 * The nsITextScroll is an interface that can be implemented by a control that
 * supports text scrolling. 
 */

[scriptable, uuid(067B28A0-877F-11d3-AF7E-00A024FFC08C)]
interface nsITextScroll : nsISupports
{
  /**
   * Scroll the view up or down by aNumLines lines. positive
   * values move down in the view. Prevents scrolling off the
   * end of the view.
   * @param numLines number of lines to scroll the view by
   */
	void scrollByLines(in long numLines);

	/**
   * Scroll the view up or down by numPages pages. a page
   * is considered to be the amount displayed by the clip view.
   * positive values move down in the view. Prevents scrolling
   * off the end of the view.
   * @param numPages number of pages to scroll the view by
   */
	void scrollByPages(in long numPages);
};