/* -*- 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 mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2003
 * the Initial Developer. All Rights Reserved.
 *
 * Original Author: Eric D Vaughan (evaughan@netscape.com)
 * Contributor(s): Aaron Leventhal (aaronl@netscape.com)
 *                 John Gaunt (jgaunt@netscape.com)
 *                 Kyle Yuan (kyle.yuan@sun.com)
 *                 Håkan Waara (hwaara@gmail.com)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either 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"
#include "nsIArray.idl"

interface nsIPersistentProperties;
interface nsIDOMDOMStringList;

/**
 * A cross-platform interface that supports platform-specific 
 * accessibility APIs like MSAA and ATK. Contains the sum of what's needed
 * to support IAccessible as well as ATK's generic accessibility objects.
 * Can also be used by in-process accessibility clients to get information
 * about objects in the accessible tree. The accessible tree is a subset of 
 * nodes in the DOM tree -- such as documents, focusable elements and text.
 * Mozilla creates the implementations of nsIAccessible on demand.
 * See http://www.mozilla.org/projects/ui/accessibility for more information.
 *
 * @status UNDER_REVIEW
 */
[scriptable, uuid(b3674866-49a9-4cf2-bfea-c00be2d4a695)]
interface nsIAccessible : nsISupports
{
  /**
   * Parent node in accessible tree.
   */
  readonly attribute nsIAccessible parent;

  /**
   * Next sibling in accessible tree
   */
  readonly attribute nsIAccessible nextSibling;

  /**
   * Previous sibling in accessible tree
   */
  readonly attribute nsIAccessible previousSibling;

  /**
   * First child in accessible tree
   */
  readonly attribute nsIAccessible firstChild;

  /**
   * Last child in accessible tree
   */
  readonly attribute nsIAccessible lastChild;
  
  /**
   * Array of all this element's children.
   */
  readonly attribute nsIArray children;

  /**
   * Number of accessible children
   */
  readonly attribute long childCount;

  /**
   * The 0-based index of this accessible in its parent's list of children,
   * or -1 if this accessible does not have a parent.
   */
  readonly attribute long indexInParent;

  /**
   * Accessible name -- the main text equivalent for this node
   */
  attribute AString name;

  /**
   * Accessible value -- a number or a secondary text equivalent for this node
   * Widgets that use role attribute can force a value using the valuenow attribute
   */
  readonly attribute AString value;

  /**
   * Accessible description -- long text associated with this node
   */
  readonly attribute AString description;

  /**
   * Provides localized string of accesskey name, such as Alt+D.
   * The modifier may be affected by user and platform preferences.
   * Usually alt+letter, or just the letter alone for menu items. 
   */
  readonly attribute AString keyboardShortcut;

  /**
   * Provides localized string of global keyboard accelerator for default
   * action, such as Ctrl+O for Open file
   */
  readonly attribute AString defaultKeyBinding;

  /**
   * Provides array of localized string of global keyboard accelerator for
   * the given action index supported by accessible.
   *
   * @param aActionIndex - index of the given action
   */
  nsIDOMDOMStringList getKeyBindings(in PRUint8 aActionIndex);

  /**
   * Natural enumerated accessible role for the associated element.
   * The values depend on platform because of variations.
   * See the ROLE_* constants defined in nsIAccessibleRole.
   * This does not take into account role attribute as the finalRole does.
   */
  readonly attribute unsigned long role;

  /**
   * Enumerated accessible role. The values depend on platform because of variations.
   * See the ROLE_* constants defined in nsIAccessibleRole.
   * Widgets can use role attribute to force the final role
   */
  readonly attribute unsigned long finalRole;

  /**
   * Accessible states -- bit fields which describe boolean properties of node.
   * Many states are only valid given a certain role attribute that supports
   * them.
   *
   * @param aState - the first bit field (see nsIAccessibleStates::STATE_*
   *                 constants)
   * @param aExtraState - the second bit field
   *                      (see nsIAccessibleStates::EXT_STATE_* constants)
   */
  void getFinalState(out unsigned long aState, out unsigned long aExtraState);

  /**
   * Help text associated with node
   */
  readonly attribute AString help;

  /**
   * Focused accessible child of node
   */
  readonly attribute nsIAccessible focusedChild;

  /**
   * Attributes of accessible
   */
  readonly attribute nsIPersistentProperties attributes;

  /**
   * Returns grouping information. Used for tree items, list items, tab panel
   * labels, radio buttons, etc. Also used for collectons of non-text objects.
   *
   * @param groupLevel - 1-based, similar to ARIA 'level' property
   * @param similarItemsInGroup - 1-based, similar to ARIA 'setsize' property
   * @param positionInGroup - 1-based, similar to ARIA 'posinset' property
   */
  void groupPosition(out long aGroupLevel, out long aSimilarItemsInGroup,
                     out long aPositionInGroup);

  /**
   * Accessible child which contains the coordinate at (x, y) in screen pixels.
   */
  nsIAccessible getChildAtPoint(in long x, in long y);

  /**
   * Nth accessible child using zero-based index or last child if index less than zero
   */
  nsIAccessible getChildAt(in long aChildIndex);

  /**
   * Accessible node geometrically to the right of this one
   */
  nsIAccessible getAccessibleToRight();

  /**
   * Accessible node geometrically to the left of this one
   */
  nsIAccessible getAccessibleToLeft();

  /**
   * Accessible node geometrically above this one
   */
  nsIAccessible getAccessibleAbove();

  /**
   * Accessible node geometrically below this one
   */
  nsIAccessible getAccessibleBelow();

  /**
   * Accessible node related to this one 
   */
  nsIAccessible getAccessibleRelated(in unsigned long aRelationType);

  void getBounds(out long x, 
                    out long y, 
                    out long width, 
                    out long height);

  /**
   * Add or remove this accessible to the current selection
   */
  void setSelected(in boolean isSelected);

  /**
   * Extend the current selection from its current accessible anchor node
   * to this accessible
   */
  void extendSelection();

  /**
   * Select this accessible node only
   */
  void takeSelection();

  /**
   * Focus this accessible node,
   * The state STATE_FOCUSABLE indicates whether this node is normally focusable.
   * It is the callers responsibility to determine whether this node is focusable.
   * accTakeFocus on a node that is not normally focusable (such as a table),
   * will still set focus on that node, although normally that will not be visually 
   * indicated in most style sheets.
   */
  void takeFocus();

  /**
   * The number of accessible actions associated with this accessible
   */
  readonly attribute PRUint8 numActions;

  /**
   * The name of the accessible action at the given zero-based index
   */
  AString getActionName(in PRUint8 index);

  /**
   * The description of the accessible action at the given zero-based index
   */
  AString getActionDescription(in PRUint8 aIndex);

  /**
   * Perform the accessible action at the given zero-based index
   * Action number 0 is the default action
   */
  void doAction(in PRUint8 index);   

  /**
   * Get a pointer to accessibility interface for this node, which is specific 
   * to the OS/accessibility toolkit we're running on.
   */
  [noscript] void getNativeInterface(out voidPtr aOutAccessible);

  /**
   * API states we map from opposite states
   *   VISIBLE -- mapped as the opposite of INVISIBLE
   *   SHOWING -- mapped as the opposite of OFFSCREEN
   *
   * ATK states we don't have in nsIAccessible:
   *   ARMED -- no clear use case, used briefly when button is activated
   *   HAS_TOOLTIP -- no known use case
   *   ICONIFIED -- Mozilla does not have elements which are collapsable into icons
   *   TRUNCATED -- need use case. Indicates that an object's onscreen content is truncated, e.g. a text value in a spreadsheet cell. No IA2 state.
   */   

/**
 * Relation Types -- most of these come from ATK's atkrelationtype.h
 * When adding support for relations, make sure to add them to appropriate
 * places in nsAccessibleWrap implementations
 * RELATION_NULL:
 * RELATION_CONTROLLED_BY:    Controlled by one or more target objects.
 * RELATION_CONTROLLER_FOR:   Controller for one or more target objects.
 * RELATION_LABEL_FOR:        Label for one or more target objects.
 * RELATION_LABELLED_BY:      Labelled by one or more target objects.
 * RELATION_MEMBER_OF:        Member of a group of one or more target objects.
 * RELATION_NODE_CHILD_OF:    Cell in a treetable which is displayed because a
 *                            cell in the same col is expanded & identifies it.
 * RELATION_FLOWS_TO:         Has content that flows logically to another
 *                            object in a sequential way, e.g. text flow.
 * RELATION_FLOWS_FROM:       Has content that flows logically from another
 *                            object in a sequential way, e.g. text flow.
 * RELATION_SUBWINDOW_OF:     Subwindow attached to a component but otherwise 
 *                            not connected in the UI hierarchy to that component.
 * RELATION_EMBEDS:           Visually embeds another object's content, i.e.
 *                            this object's content flows around another's content.
 * RELATION_EMBEDDED_BY:      Inverse of RELATION_EMBEDS; this object's content
 *                            is visually embedded in another object.
 * RELATION_POPUP_FOR:        Popup for another object.
 * RELATION_PARENT_WINDOW_OF: Parent window of another object.
 * RELATION_DEFAULT_BUTTON:   Part of a form/dialog with a related default button.
 * RELATION_DESCRIBED_BY:     Described by one or more target objects.
 * RELATION_DESCRIPTION_FOR:  Description for one or more target objects.
 */

  const unsigned long RELATION_NUL = 0x00;               // ATK_RELATION_NUL
  const unsigned long RELATION_CONTROLLED_BY = 0x01;     // ATK_RELATION_CONTROLLED_BY
  const unsigned long RELATION_CONTROLLER_FOR = 0x02;    // ATK_RELATION_CONTROLLER_FOR
  const unsigned long RELATION_LABEL_FOR = 0x03;         // ATK_RELATION_LABEL_FOR
  const unsigned long RELATION_LABELLED_BY = 0x04;       // ATK_RELATION_LABELLED_BY
  const unsigned long RELATION_MEMBER_OF = 0x05;         // ATK_RELATION_MEMBER_OF
  const unsigned long RELATION_NODE_CHILD_OF = 0x06;     // ATK_RELATION_NODE_CHILD_OF
  const unsigned long RELATION_FLOWS_TO = 0x07;          // ATK_RELATION_FLOWS_TO
  const unsigned long RELATION_FLOWS_FROM = 0x08;        // ATK_RELATION_FLOWS_FROM
  const unsigned long RELATION_SUBWINDOW_OF = 0x09;      // ATK_RELATION_SUBWINDOW_OF
  const unsigned long RELATION_EMBEDS = 0x0a;            // ATK_RELATION_EMBEDS
  const unsigned long RELATION_EMBEDDED_BY = 0x0b;       // ATK_RELATION_EMBEDDED_BY
  const unsigned long RELATION_POPUP_FOR = 0x0c;         // ATK_RELATION_POPUP_FOR
  const unsigned long RELATION_PARENT_WINDOW_OF = 0x0d;  // ATK_RELATION_PARENT_WINDOW_OF
  const unsigned long RELATION_DESCRIBED_BY = 0x0e;      // ATK_RELATION_DESCRIBED_BY
  const unsigned long RELATION_DESCRIPTION_FOR = 0x0f;   // ATK_RELATION_DESCRIPTION_FOR
  const unsigned long RELATION_DEFAULT_BUTTON = 0x4000;  // MSAA only, no ATK relation

// MSAA relationship extensions to accNavigate
  const unsigned long NAVRELATION_CONTROLLED_BY = 0x1000;
  const unsigned long NAVRELATION_CONTROLLER_FOR = 0x1001;
  const unsigned long NAVRELATION_LABEL_FOR = 0x1002;
  const unsigned long NAVRELATION_LABELLED_BY = 0x1003;
  const unsigned long NAVRELATION_MEMBER_OF = 0x1004;
  const unsigned long NAVRELATION_NODE_CHILD_OF = 0x1005;
  const unsigned long NAVRELATION_FLOWS_TO = 0x1006;
  const unsigned long NAVRELATION_FLOWS_FROM = 0x1007;
  const unsigned long NAVRELATION_SUBWINDOW_OF = 0x1008;
  const unsigned long NAVRELATION_EMBEDS = 0x1009;
  const unsigned long NAVRELATION_EMBEDDED_BY = 0x100a;
  const unsigned long NAVRELATION_POPUP_FOR = 0x100b;
  const unsigned long NAVRELATION_PARENT_WINDOW_OF = 0x100c;
  const unsigned long NAVRELATION_DEFAULT_BUTTON = 0x100d;
  const unsigned long NAVRELATION_DESCRIBED_BY = 0x100e;
  const unsigned long NAVRELATION_DESCRIPTION_FOR = 0x100f;
};
