gecko-dev/accessible/public/nsIAccessible.idl

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/* -*- 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;
interface nsIAccessibleRelation;
/**
* 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.
*/
[scriptable, uuid(c81d8f8c-8585-4094-bc7c-71dd01494906)]
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. The name is
* specified by ARIA or by native markup. Example of ARIA markup is
* aria-labelledby attribute placed on element of this accessible. Example
* of native markup is HTML label linked with HTML element of this accessible.
*
* Value can be string or null. A null value indicates that AT may attempt to
* compute the name. Any string value, including the empty string, should be
* considered author-intentional, and respected.
*/
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);
/**
* Enumerated accessible role (see the constants defined in nsIAccessibleRole).
*
* @note The values might depend on platform because of variations. Widgets
* can use ARIA role attribute to force the final role.
*/
readonly attribute unsigned long role;
/**
* 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 getState(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,
* inclusive of the current item
* @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.
* If the point is in the current accessible but not in a child, the
* current accessible will be returned.
* If the point is in neither the current accessible or a child, then
* null will be returned.
*
* @param x screen's x coordinate
* @param y screen's y coordinate
* @return the deepest accessible child containing the given point
*/
nsIAccessible getChildAtPoint(in long x, in long y);
/**
* Deepest accessible child which contains the coordinate at (x, y) in screen
* pixels. If the point is in the current accessible but not in a child, the
* current accessible will be returned. If the point is in neither the current
* accessible or a child, then null will be returned.
*
* @param x screen's x coordinate
* @param y screen's y coordinate
* @return the deepest accessible child containing the given point
*/
nsIAccessible getDeepestChildAtPoint(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();
/**
* Return accessible relation by the given relation type (see.
* constants defined in nsIAccessibleRelation).
*/
nsIAccessibleRelation getRelationByType(in unsigned long aRelationType);
/**
* Returns the number of accessible relations for this object.
*/
readonly attribute unsigned long relationsCount;
/**
* Returns one accessible relation for this object.
*
* @param index - relation index (0-based)
*/
nsIAccessibleRelation getRelation(in unsigned long index);
/**
* Returns multiple accessible relations for this object.
*/
nsIArray getRelations();
/**
* Return accessible's x and y coordinates relative to the screen and
* accessible's width and height.
*/
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);
};