/* -*- 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.
 *
 * Contributors:
 *   Aaron Leventhal <aleventh@us.ibm.com> (original author)
 *   Alexander Surkov <surkov.alexander@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"

interface nsIAccessible;
interface nsIAccessibleDocument;
interface nsIDOMNode;

%{C++
#define NS_ACCESSIBLE_EVENT_TOPIC "accessible-event"
%}

/**
 * An interface for accessibility events listened to
 * by in-process accessibility clients, which can be used
 * to find out how to get accessibility and DOM interfaces for
 * the event and its target. To listen to in-process accessibility invents,
 * make your object an nsIObserver, and listen for accessible-event by 
 * using code something like this:
 *   nsCOMPtr<nsIObserverService> observerService = 
 *     do_GetService("@mozilla.org/observer-service;1", &rv);
 *   if (NS_SUCCEEDED(rv)) 
 *     rv = observerService->AddObserver(this, "accessible-event", PR_TRUE);
 *
 * @status UNDER_REVIEW
 */
[scriptable, uuid(ba448f0e-a761-48c8-a0f5-1f25e23d4fe4)]
interface nsIAccessibleEvent : nsISupports
{
  /**
   * An object has been created.
   */
  const unsigned long EVENT_DOM_CREATE = 0x0001;

  /**
   * An object has been destroyed.
   */
  const unsigned long EVENT_DOM_DESTROY = 0x0002;

  /**
   * An object's properties or content have changed significantly so that the
   * type of object has really changed, and therefore the accessible should be 
   * destroyed or recreated.
   */
  const unsigned long EVENT_DOM_SIGNIFICANT_CHANGE = 0x0003;

  /**
   * A hidden object is shown -- this is a layout occurance and is thus asynchronous
   */
  const unsigned long EVENT_ASYNCH_SHOW = 0x0004;

  /**
   * An object is hidden -- this is a layout occurance and is thus asynchronous
   */
  const unsigned long EVENT_ASYNCH_HIDE = 0x0005;

  /**
   * An object had a significant layout change which could affect
   * the type of accessible object -- this is a layout occurance and is thus asynchronous
   */
  const unsigned long EVENT_ASYNCH_SIGNIFICANT_CHANGE = 0x0006;

  /**
   * The active descendant of a component has changed. The active descendant
   * is used in objects with transient children.
   */
  const unsigned long EVENT_ACTIVE_DECENDENT_CHANGED = 0x0007;

  /**
   * An object has received the keyboard focus.
   */
  const unsigned long EVENT_FOCUS = 0x0008;

  /**
   * An object's state has changed.
   */
  const unsigned long EVENT_STATE_CHANGE = 0x0009;

  /**
   * An object has changed location, shape, or size.
   */
  const unsigned long EVENT_LOCATION_CHANGE = 0x000A;

  /**
   * An object's Name property has changed.
   */
  const unsigned long EVENT_NAME_CHANGE = 0x000B;

  /**
   * An object's Description property has changed.
   */
  const unsigned long EVENT_DESCRIPTION_CHANGE = 0x000C;

  /**
   * An object's Value property has changed.
   */
  const unsigned long EVENT_VALUE_CHANGE = 0x000D;

  /**
   * An object's help has changed.
   */
  const unsigned long EVENT_HELP_CHANGE = 0x000E;

  /**
   * An object's default action has changed.
   */
  const unsigned long EVENT_DEFACTION_CHANGE = 0x000F;

  /**
   * An object's action has changed.
   */
  const unsigned long EVENT_ACTION_CHANGE = 0x0010;

  /**
   * An object's keyboard shortcut has changed.
   */
  const unsigned long EVENT_ACCELERATOR_CHANGE = 0x0011;

  /**
   * The selection within a container object has changed.
   */
  const unsigned long EVENT_SELECTION = 0x0012;

  /**
   * An item within a container object has been added to the selection.
   */
  const unsigned long EVENT_SELECTION_ADD = 0x0013;

  /**
   * An item within a container object has been removed from the selection.
   */
  const unsigned long EVENT_SELECTION_REMOVE = 0x0014;

  /**
   * Numerous selection changes have occurred within a container object.
   */
  const unsigned long EVENT_SELECTION_WITHIN = 0x0015;

  /**
   * An alert has been generated. Server applications send this event when a
   * user needs to know that a user interface element has changed.
   */
  const unsigned long EVENT_ALERT = 0x0016;

  /**
   * The foreground window has changed.
   */
  const unsigned long EVENT_FOREGROUND = 0x0017;

  /**
   * A menu item on the menu bar has been selected.
   */
  const unsigned long EVENT_MENU_START = 0x0018;

  /**
   * A menu from the menu bar has been closed.
   */
  const unsigned long EVENT_MENU_END = 0x0019;

  /**
   * A pop-up menu has been displayed.
   */
  const unsigned long EVENT_MENUPOPUP_START = 0x001A;

  /**
   * A pop-up menu has been closed.
   */
  const unsigned long EVENT_MENUPOPUP_END = 0x001B;

  /**
   * A window has received mouse capture.
   */
  const unsigned long EVENT_CAPTURE_START = 0x001C;

  /**
   * A window has lost mouse capture.
   */
  const unsigned long EVENT_CAPTURE_END = 0x001D;

  /**
   * A window is being moved or resized.
   */
  const unsigned long EVENT_MOVESIZE_START = 0x001E;

  /**
  * The movement or resizing of a window has finished
  */
  const unsigned long EVENT_MOVESIZE_END = 0x001F;

  /**
   * A window has entered context-sensitive Help mode
   */
  const unsigned long EVENT_CONTEXTHELP_START = 0x0020;

  /**
   * A window has exited context-sensitive Help mode
   */
  const unsigned long EVENT_CONTEXTHELP_END = 0x0021;

  /**
   * An application is about to enter drag-and-drop mode
   */
  const unsigned long EVENT_DRAGDROP_START = 0x0022;

  /**
   * An application is about to exit drag-and-drop mode
   */
  const unsigned long EVENT_DRAGDROP_END = 0x0023;
  
  /**
   * A dialog box has been displayed
   */
  const unsigned long EVENT_DIALOG_START = 0x0024;

  /**
   * A dialog box has been closed
   */
  const unsigned long EVENT_DIALOG_END = 0x0025;

  /**
   * Scrolling has started on a scroll bar
   */
  const unsigned long EVENT_SCROLLING_START = 0x0026;

  /**
   * Scrolling has ended on a scroll bar
   */
  const unsigned long EVENT_SCROLLING_END = 0x0027;

  /**
   * A window object is about to be minimized or maximized
   */
  const unsigned long EVENT_MINIMIZE_START = 0x0028;

  /**
   * A window object has been minimized or maximized
   */
  const unsigned long EVENT_MINIMIZE_END = 0x0029;

  /**
   * XXX:
   */
  const unsigned long EVENT_DOCUMENT_LOAD_START = 0x002A;

  /**
   * The loading of the document has completed.
   */
  const unsigned long EVENT_DOCUMENT_LOAD_COMPLETE = 0x002B;

  /**
   * The document contents are being reloaded.
   */
  const unsigned long EVENT_DOCUMENT_RELOAD = 0x002C;

  /**
   * The loading of the document was interrupted.
   */
  const unsigned long EVENT_DOCUMENT_LOAD_STOPPED = 0x002D;

  /**
   * The document wide attributes of the document object have changed.
   */
  const unsigned long EVENT_DOCUMENT_ATTRIBUTES_CHANGED = 0x002E;

  /**
   * The contents of the document have changed.
   */
  const unsigned long EVENT_DOCUMENT_CONTENT_CHANGED = 0x002F;

  const unsigned long EVENT_PROPERTY_CHANGED = 0x0030;
  const unsigned long EVENT_SELECTION_CHANGED = 0x0031;

  /**
   * A text object's attributes changed.
   * Also see EVENT_OBJECT_ATTRIBUTE_CHANGED.
   */
  const unsigned long EVENT_TEXT_ATTRIBUTE_CHANGED = 0x0032;

  /**
   * The caret has moved to a new position.
   */
  const unsigned long EVENT_TEXT_CARET_MOVED = 0x0033;

  /**
   * This event indicates general text changes, i.e. changes to text that is
   * exposed through the IAccessibleText and IAccessibleEditableText interfaces.
   */
  const unsigned long EVENT_TEXT_CHANGED = 0x0034;

  /**
   * Text was inserted.
   */
  const unsigned long EVENT_TEXT_INSERTED = 0x0035;

  /**
   * Text was removed.
   */
  const unsigned long EVENT_TEXT_REMOVED = 0x0036;

  /**
   * Text was updated.
   */
  const unsigned long EVENT_TEXT_UPDATED = 0x0037;

  /**
   * The text selection changed.
   */
  const unsigned long EVENT_TEXT_SELECTION_CHANGED = 0x0038;

  /**
   * A visibile data event indicates the change of the visual appearance
   * of an accessible object.  This includes for example most of the
   * attributes available via the IAccessibleComponent interface.
   */
  const unsigned long EVENT_VISIBLE_DATA_CHANGED = 0x0039;

  /**
   * The caret moved from one column to the next.
   */
  const unsigned long EVENT_TEXT_COLUMN_CHANGED = 0x003A;

  /**
   * The caret moved from one section to the next.
   */
  const unsigned long EVENT_SECTION_CHANGED = 0x003B;

  /**
   * A table caption changed.
   */
  const unsigned long EVENT_TABLE_CAPTION_CHANGED = 0x003C;

  /**
   * A table's data changed.
   */
  const unsigned long EVENT_TABLE_MODEL_CHANGED = 0x003D;

  /**
   * A table's summary changed.
   */
  const unsigned long EVENT_TABLE_SUMMARY_CHANGED = 0x003E;

  /**
   * A table's row description changed.
   */
  const unsigned long EVENT_TABLE_ROW_DESCRIPTION_CHANGED = 0x003F;

  /**
   * A table's row header changed.
   */
  const unsigned long EVENT_TABLE_ROW_HEADER_CHANGED = 0x0040;

  const unsigned long EVENT_TABLE_ROW_INSERT = 0x0041;
  const unsigned long EVENT_TABLE_ROW_DELETE = 0x0042;
  const unsigned long EVENT_TABLE_ROW_REORDER = 0x0043;

  /**
   * A table's column description changed.
   */
  const unsigned long EVENT_TABLE_COLUMN_DESCRIPTION_CHANGED = 0x0044;

  /**
   * A table's column header changed.
   */
  const unsigned long EVENT_TABLE_COLUMN_HEADER_CHANGED = 0x0045;

  const unsigned long EVENT_TABLE_COLUMN_INSERT = 0x0046;
  const unsigned long EVENT_TABLE_COLUMN_DELETE = 0x0047;
  const unsigned long EVENT_TABLE_COLUMN_REORDER = 0x0048;

  const unsigned long EVENT_WINDOW_ACTIVATE = 0x0049;
  const unsigned long EVENT_WINDOW_CREATE = 0x004A;
  const unsigned long EVENT_WINDOW_DEACTIVATE = 0x004B;
  const unsigned long EVENT_WINDOW_DESTROY = 0x004C;
  const unsigned long EVENT_WINDOW_MAXIMIZE = 0x004D;
  const unsigned long EVENT_WINDOW_MINIMIZE = 0x004E;
  const unsigned long EVENT_WINDOW_RESIZE = 0x004F;
  const unsigned long EVENT_WINDOW_RESTORE = 0x0050;

  /**
   * The ending index of this link within the containing string has changed.
   */
  const unsigned long EVENT_HYPERLINK_END_INDEX_CHANGED = 0x0051;

  /**
   * The number of anchors assoicated with this hyperlink object has changed.
   */
  const unsigned long EVENT_HYPERLINK_NUMBER_OF_ANCHORS_CHANGED = 0x0052;

  /**
   * The hyperlink selected state changed from selected to unselected or
   * from unselected to selected.
   */
  const unsigned long EVENT_HYPERLINK_SELECTED_LINK_CHANGED = 0x0053;

  /**
   * One of the links associated with the hypertext object has been activated.
   */
  const unsigned long EVENT_HYPERTEXT_LINK_ACTIVATED = 0x0054;

  /**
   * One of the links associated with the hypertext object has been selected.
   */
  const unsigned long EVENT_HYPERTEXT_LINK_SELECTED = 0x0055;

  /**
   * The starting index of this link within the containing string has changed.
   */
  const unsigned long EVENT_HYPERLINK_START_INDEX_CHANGED = 0x0056;

  /**
   * Focus has changed from one hypertext object to another, or focus moved
   * from a non-hypertext object to a hypertext object, or focus moved from a
   * hypertext object to a non-hypertext object.
   */
  const unsigned long EVENT_HYPERTEXT_CHANGED = 0x0057;

  /**
   * The number of hyperlinks associated with a hypertext object changed.
   */
  const unsigned long EVENT_HYPERTEXT_NLINKS_CHANGED = 0x0058;

  /**
   * An object's attributes changed. Also see EVENT_TEXT_ATTRIBUTE_CHANGED.
   */
  const unsigned long EVENT_OBJECT_ATTRIBUTE_CHANGED = 0x0059;

  /**
   * A slide changed in a presentation document or a page boundary was
   * crossed in a word processing document.
   */
  const unsigned long EVENT_PAGE_CHANGED = 0x005A;

  /**
   * Used internally in Gecko.
   */
  const unsigned long EVENT_INTERNAL_LOAD = 0x005B;

  /**
   * An object's children have changed
   */
  const unsigned long EVENT_REORDER = 0x005C;

  /**
   * Help make sure event map does not get out-of-line.
   */
  const unsigned long EVENT_LAST_ENTRY = 0x005D;

  /**
   * The type of event, based on the enumerated event values
   * defined in this interface.
   */
  readonly attribute unsigned long eventType;
  
  /**
   * The nsIAccessible associated with the event.
   * May return null if no accessible is available
   */
  readonly attribute nsIAccessible accessible;
  
  /**
   * The nsIAccessibleDocument that the event target nsIAccessible
   * resides in. This can be used to get the DOM window,
   * the DOM document and the window handler, among other things.
   */
  readonly attribute nsIAccessibleDocument accessibleDocument;

  /**
   * The nsIDOMNode associated with the event
   * May return null if accessible for event has been shut down
   */
  readonly attribute nsIDOMNode DOMNode;

  /**
   * Returns true if the event was caused by explicit user input,
   * as opposed to purely originating from a timer or mouse movement
   */
  attribute boolean isFromUserInput;
};


[scriptable, uuid(444db51a-05fd-4576-8a64-32dbb2a83884)]
interface nsIAccessibleStateChangeEvent : nsIAccessibleEvent
{
  /**
   * Returns the state of accessible (see constants declared
   * in nsIAccessibleStates).
   */
  readonly attribute unsigned long state;

  /**
   * Returns true if the state is extra state.
   */
  boolean isExtraState();

  /**
   * Returns true if the state is turned on.
   */
  boolean isEnabled();
};


[scriptable, uuid(50a1e151-8e5f-4bcc-aaaf-a4bed1190e93)]
interface nsIAccessibleTextChangeEvent : nsIAccessibleEvent
{
  /**
   * Returns offset of changed text in accessible.
   */
  readonly attribute long start;

  /**
   * Returns length of changed text.
   */
  readonly attribute unsigned long length;

  /**
   * Returns true if text was inserted, otherwise false.
   */
  boolean isInserted();

  /**
   * The inserted or removed text
   */
  readonly attribute DOMString modifiedText;
};

[scriptable, uuid(b9076dce-4cd3-4e3d-a7f6-7f33a7f40c31)]
interface nsIAccessibleCaretMoveEvent: nsIAccessibleEvent
{
  /**
   * Return caret offset.
   */
  readonly attribute long caretOffset;
};

[scriptable, uuid(a9485c7b-5861-4695-8441-fab0235b205d)]
interface nsIAccessibleTableChangeEvent: nsIAccessibleEvent
{
  /**
   * Return the row or column index.
   */
  readonly attribute long rowOrColIndex;

  /**
   * Return the number of rows or cols
   */
  readonly attribute long numRowsOrCols;
};