/* -*- 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 the Mozilla browser.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Bill Haneman (bill.haneman@sun.com)
 *   John Gaunt (jgaunt@netscape.com)
 *
 * 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 ***** */

#include "nsISupports.idl"

interface nsIURI;
interface nsIAccessible;

/**
 * A cross-platform interface that supports hyperlink-specific properties and
 * methods.  Anchors, image maps, xul:labels with class="text-link" implement this interface.
 */
[scriptable, uuid(38c60bfa-6040-4bfe-93f2-acd6a909bb60)]
interface nsIAccessibleHyperLink : nsISupports
{
  /**
   * Returns the offset of the link within the parent accessible.
   */
  readonly attribute long startIndex;

  /**
   * Returns the end index of the link within the parent accessible.
   *
   * @note  The link itself is represented by one embedded character within the
   * parent text, so the endIndex should be startIndex + 1.
   */
  readonly attribute long endIndex;

  /**
   * Determines whether the link is valid (e. g. points to a valid URL).
   *
   * @note  XXX Currently only used with ARIA links, and the author has to
   * specify that the link is invalid via the aria-invalid="true" attribute.
   * In all other cases, TRUE is returned.
   */
  readonly attribute boolean valid;

  /**
   * Determines whether the element currently has the focus, e. g. after
   * returning from the destination page.
   *
   * @note  ARIA links can only be focused if they have the tabindex
   * attribute set.  Also, state_focused should then be set on the accessible
   * for this link.
   */
  readonly attribute boolean selected;

  /**
   * The numbber of anchors within this Hyperlink. Is normally 1 for anchors.
   * This anchor is, for example, the visible output of the html:a tag.
   * With an Image Map, reflects the actual areas within the map.
   */
  readonly attribute long anchorCount;

  /**
   * Returns the URI at the given index.
   *
   * @note  ARIA hyperlinks do not have an URI to point to, since clicks are
   * processed via JavaScript. Therefore this property does not work on ARIA
   * links.
   *
   * @param index  The 0-based index of the URI to be returned.
   *
   * @return the nsIURI object containing the specifications for the URI.
   */
  nsIURI getURI (in long index);

  /**
   * Returns a reference to the object at the given index.
   *
   * @param index  The 0-based index whose object is to be returned.
   *
   * @return the nsIAccessible object at the desired index.
   */
  nsIAccessible getAnchor (in long index);
};

/*
 Assumptions:

 The object associated with object or anchor index
 is an nsIAccessible.
 A URI can be represented by the nsIURI interface
 (or nsIURL interface).

 Note that an object which supports nsIAccessibleHyperlink
 does *not* generally implement nsIAccessible, unlike the
    case of the other nsiAccessible* interfaces in this directory.

    Aaron: would the nsISupports return from
    getObject be queryable for nsIURI and nsIURL directly?

*/