/* -*- 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 nsIAccessible;
interface nsIWeakReference;
interface nsIAccessiblePivot;
interface nsIAccessibleTextLeafPoint;

webidl Node;

/**
 * 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, builtinclass, uuid(2188e3a0-c88e-11e7-8f1a-0800200c9a66)]
interface nsIAccessibilityService : 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 Node aNode);

  nsIAccessible getAccessibleDescendantFor(in Node 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.
    */
  nsISupports 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 Node 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);

  /**
   * Create a new nsIAccessibleTextLeafPoint.
   *
   * @param aAccessible [in] the accessible for the point
   * @param aOffset     [in] the offset of the point
   * @return a new point
   */
  nsIAccessibleTextLeafPoint createTextLeafPoint(in nsIAccessible aAccessible,
                                                 in long aOffset);

  /**
   * Enable logging for the given modules, all other modules aren't logged.
   *
   * @param aModules [in] list of modules, format is comma separated list
   *                      like 'docload,doccreate'.
   * @note Works on debug build only.
   * @see Logging.cpp for list of possible values.
   */
  void setLogging(in ACString aModules);

  /**
   * Return true if the given module is logged.
   */
  boolean isLogged(in AString aModule);

  /**
   * Get the current accessibility service consumers.
   * @returns a JSON string representing the accessibility service consumers.
   */
  AString getConsumers();
};