/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"

interface nsIDOMNode;
interface nsIAccessible;
interface nsIWeakReference;
interface nsIPresShell;
interface nsIDOMWindow;
interface nsIDOMDOMStringList;
interface nsIAccessiblePivot;

/**
 * An interface for in-process accessibility clients wishing to get an
 * nsIAccessible for a given DOM node.  More documentation at:
 *   http://www.mozilla.org/projects/ui/accessibility
 */
[scriptable, uuid(310ce77d-c92b-4761-82e8-77e1a728e8d4)]
interface nsIAccessibleRetrieval : nsISupports
{
  /**
   * Return application accessible.
   */
  nsIAccessible getApplicationAccessible();

  /**
   * Return an nsIAccessible for a DOM node in pres shell 0.
   * Create a new accessible of the appropriate type if necessary,
   * or use one from the accessibility cache if it already exists.
   * @param aNode The DOM node to get an accessible for.
   * @return The nsIAccessible for the given DOM node.
   */
  nsIAccessible getAccessibleFor(in nsIDOMNode aNode);

   /**
    * Returns accessible role as a string.
    *
    * @param aRole - the accessible role constants.
    */
  AString getStringRole(in unsigned long aRole);

   /**
    * Returns list which contains accessible states as a strings.
    *
    * @param aStates - accessible states.
    * @param aExtraStates - accessible extra states.
    */
  nsIDOMDOMStringList getStringStates(in unsigned long aStates,
                                      in unsigned long aExtraStates);

  /**
   * Get the type of accessible event as a string.
   *
   * @param aEventType - the accessible event type constant
   * @return - accessible event type presented as human readable string
   */
  AString getStringEventType(in unsigned long aEventType);

  /**
   * Get the type of accessible relation as a string.
   *
   * @param aRelationType - the accessible relation type constant
   * @return - accessible relation type presented as human readable string
   */
  AString getStringRelationType(in unsigned long aRelationType);

  /**
   * Return an accessible for the given DOM node from the cache.
   * @note  the method is intended for testing purposes
   *
   * @param aNode  [in] the DOM node to get an accessible for
   *
   * @return       cached accessible for the given DOM node if any
   */
  nsIAccessible getAccessibleFromCache(in nsIDOMNode aNode);

  /**
   * Create a new pivot for tracking a position and traversing a subtree.
   *
   * @param aRoot [in] the accessible root for the pivot
   * @return a new pivot
   */
  nsIAccessiblePivot createAccessiblePivot(in nsIAccessible aRoot);
};


%{ C++

// for component registration
// {663CA4A8-D219-4000-925D-D8F66406B626}
#define NS_ACCESSIBLE_RETRIEVAL_CID \
{ 0x663ca4a8, 0xd219, 0x4000, { 0x92, 0x5d, 0xd8, 0xf6, 0x64, 0x6, 0xb6, 0x26 } }

%}
