Referencia de ActionScript® 3.0 para la plataforma de Adobe® Flash®
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xd.core.axm.enterprise.view.components
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xd.core.axm.view.components.support

Elementos del lenguaje

Constantes globales
Funciones globales
Operadores
Sentencias, palabras clave y directivas
Tipos especiales

Apéndices

Novedades
Errores del compilador
Advertencias del compilador
Errores en tiempo de ejecución
Migración a ActionScript 3
Conjuntos de caracteres admitidos
Solo etiquetas MXML
Elementos Motion XML
Etiquetas de texto temporizado
Lista de elementos desfasados
Constantes de implementación de accesibilidad
Cómo utilizar ejemplos de ActionScript
Avisos legales
Paquetemx.accessibility
Clasepublic class AccImpl
HerenciaAccImpl Inheritance AccessibilityImplementation Inheritance Object
Subclases AccordionHeaderAccImpl, ButtonAccImpl, ButtonBaseAccImpl, ComboBaseAccImpl, DateChooserAccImpl, DateFieldAccImpl, LabelAccImpl, ListBaseAccImpl, ListBaseAccImpl, MenuBarAccImpl, PanelAccImpl, PanelAccImpl, RichEditableTextAccImpl, SliderAccImpl, SliderBaseAccImpl, SpinnerAccImpl, TabBarAccImpl, TextBaseAccImpl, TreeAccImpl, VideoPlayerAccImpl

Versión del lenguaje: ActionScript 3.0
Versión de producto: Flex 3
Versiones de motor de ejecución: Flash Player 9, AIR 1.1

AccImpl is Flex's base accessibility implementation class for MX and Spark components.

It is a subclass of the Flash Player's AccessibilityImplementation class.

When an MX or Spark component is created, its accessibilityImplementation property is set to an instance of a subclass of this class. The Flash Player then uses this object to allow MSAA clients such as screen readers to see and manipulate the component. See the flash.accessibility.AccessibilityImplementation class for additional information about accessibility implementation classes and MSAA.

Children

The Flash Player does not support a true hierarchy of accessible objects. If a DisplayObject has an accessibilityImplementation object, then the accessibilityImplementation objects of its children are ignored. However, the Player does allow a component's accessibility implementation class to expose MSAA information for its internal parts. (For example, a List exposes MSAA information about its items.)

The number of children (internal parts) and the child IDs used to identify them are determined by the getChildIDArray() method. In the Player's AccessibilityImplementation base class, this method simply returns null. Flex's AccImpl class overrides it to return an empty array. It also provides a protected utility method, createChildIDArray() which subclasses with internal parts can use in their overrides.

Role

The MSAA Role of a component and its internal parts is determined by the get_accRole() method. In the Player's AccessibilityImplementation base class, this method throws a runtime error, since subclasses are expected to override it. Flex's AccImpl class has a protected role property which subclasses generally set in their constructor, and it overrides get_accRole() to return this property.

Name

The MSAA Name of a component and its internal parts is determined by the get_accName() method. In the Player's AccessibilityImplementation base class, this method simply returns null. Flex's AccImpl class overrides it to construct a name as follows, starting with an empty string and separating added portions with a single space:

  • If a simple child (e.g., combo or list box item) is being requested, only the child's default name is returned. The rest of the steps below apply only to the component itself (childID 0).
  • If the component is inside a Form:
    • If the Form has a FormHeading and the component is inside a FormItem, the heading text is added. Developers wishing to avoid this should set the accessibilityName of the FormHeading to a space (" ").
    • If the field is required, the locale-dependent string "required field" is added.
    • If the component is inside a FormItem, the FormItem label text is added. Developers wishing to avoid this should set the accessibilityName of the FormItem to a space (" ").
  • The component's name is then determined thus:
    • If the component's accessibilityName (i.e., accessibilityProperties.name) is a space, no component name is added.
    • Otherwise, if the component's name is specified (i.e., is not null and not empty) then it is added.
    • Otherwise, a protected getName() method, defined by AccImpl and implemented by each subclass, is called to provide a default name. (For example, ButtonAccImpl implements getName() to specify that a Button's default name is the label that it displays.) If not empty, the return value of getName() is added.
    • Otherwise (if getName() returned empty), if the component's toolTip property is set, that String is added.
    • If the component's errorString property is set, that String is added.

Description

The MSAA Description is determined solely by a component's accessibilityProperties object and not by its accessibilityImplementation object. Therefore there is no logic in AccessibilityImplementation or AccImpl or any subclasses of AccImpl related to the description. The normal way to set the description in Flex is via the accessibilityDescription property on UIComponent, which simply sets accessibilityProperties.description.

State

The MSAA State of a component and its internal parts is determined by the get_accState() method. In the Player's AccessibilityImplementation base class, this method throws a runtime error, since subclasses are expected to override it. Flex's AccImpl class does not override it, but provides a protected utility method, getState(), for subclasses to use in their overrides. The getState() method determines the state as a combination of

  • STATE_SYSTEM_UNAVAILABLE (when enabled is false on this component or any ancestor)
  • STATE_SYSTEM_FOCUSABLE
  • STATE_SYSTEM_FOCUSED (when the component itself is focused, not set for any subparts the component may have)
Note that by default all components are assumed to be focusable and thus the accessibility implementation classes for non-focusable components like Label must clear this state flag. When a component has a state of unavailable, the focusable state is removed by the accessibility implementation class.

Value

The MSAA Value of a component and its internal parts is determined by the get_accValue() method. In the Player's AccessibilityImplementation base class, this method simply returns null. Flex's AccImpl class does not override it, but subclasses for components like TextInput do.

Location

The MSAA Location for a component's internal parts, but not the component itself, is determined by the get_accLocation() method. This method is never called with a childID of 0; instead, the Flash Player determines the MSAA Location of a component based on its bounding rectangle as determined by getBounds(). Flex's AccImpl class does not override this method, but subclasses for components with internal parts do.

Default Action

The MSAA DefaultAction for a component and its internal parts is determined by the get_accDefaultAction() method. In the Player's AccessibilityImplementation base class, this method simply returns null. Flex's AccImpl class does not override it, but subclasses with default actions do. These subclasses also override AccessibilityImplementation's accDoDefaultAction() method to perform the default action that they advertise.

Other

The MSAA events EVENT_OBJECT_SHOW and EVENT_OBJECT_HIDE are sent when the object is shown or hidden. The corresponding states for these are covered by the Flash Player which does not render any MSAA components that are hidden. When the component is shown the states mentioned for AccImpl are used.



Propiedades públicas
 PropiedadDefinido por
 Inheritedconstructor : Object
Una referencia a la clase de objeto o función constructora para una instancia de objeto determinada.
Object
 Inheritederrno : uint
Indica un código de error.
AccessibilityImplementation
 Inheritedstub : Boolean
Se utilizan para crear un stub de accesibilidad de componentes.
AccessibilityImplementation
Propiedades protegidas
 PropiedadDefinido por
  eventsToHandle : Array
[solo lectura] All subclasses must override this function by returning an array of strings of the events to listen for.
AccImpl
  master : UIComponent
A reference to the UIComponent instance that this AccImpl instance is making accessible.
AccImpl
  role : uint
Accessibility role of the component being made accessible.
AccImpl
Métodos públicos
 MétodoDefinido por
  
Constructor.
AccImpl
 Inherited
Un método IAccessible que realiza la acción predeterminada asociada al componente que este objeto AccessibilityImplementation representa o de uno de sus elementos secundarios.
AccessibilityImplementation
 Inherited
accLocation(childID:uint):*
El método MSAA para devolver un objeto de visualización o un rectángulo que especifica el recuadro de delimitación de un elemento secundario en el AccessibilityImplementation.
AccessibilityImplementation
 Inherited
accSelect(operation:uint, childID:uint):void
Método IAccessible para modificar la selección en el componente que este AccessibilityImplementation representa.
AccessibilityImplementation
 Inherited
Método MSAA para devolver la acción predeterminada del componente que este AccessibilityImplementation representa o de uno de sus elementos secundarios.
AccessibilityImplementation
 Inherited
Método MSAA para devolver el ID de entero sin signo del elemento secundario, si lo hay, que tiene selección de elementos secundarios en el componente.
AccessibilityImplementation
 Inherited
Método MSAA para devolver el nombre del componente que este AccessibilityImplementation representa o de uno de sus elementos secundarios.
AccessibilityImplementation
 Inherited
Método MSAA para devolver la función del sistema del componente que este AccessibilityImplementation representa o de uno de sus elementos secundarios.
AccessibilityImplementation
 Inherited
Método MSAA para devolver un conjunto que contiene el ID de todos los elementos secundarios que se hayan seleccionado.
AccessibilityImplementation
 Inherited
Método IAccessible para devolver el estado actual del motor de ejecución del componente que este AccessibilityImplementation representa o de uno de sus elementos secundarios.
AccessibilityImplementation
 Inherited
Método MSAA para devolver el valor del motor de ejecución del componente que este AccessibilityImplementation representa o de uno de sus elementos secundarios.
AccessibilityImplementation
 Inherited
AccessibilityImplementation
 Inherited
AccessibilityImplementation
 Inherited
Devuelve un conjunto que contiene ID de enteros sin signo de todos los elementos secundarios de AccessibilityImplementation.
AccessibilityImplementation
  
[estática] Method for supporting Form Accessibility.
AccImpl
 Inherited
Indica si un objeto tiene definida una propiedad especificada.
Object
  
[estática] Returns true if an ancestor of the component has enabled set to false.
AccImpl
 Inherited
Devuelve true o false para indicar si el objeto de texto que tiene un recuadro de delimitación especificado por x, y, width y height debe considerarse como una etiqueta para el componente que AccessibilityImplementation representa.
AccessibilityImplementation
 Inherited
Indica si hay una instancia de la clase Object en la cadena de prototipo del objeto especificado como parámetro.
Object
 Inherited
Indica si existe la propiedad especificada y si es enumerable.
Object
 Inherited
Establece la disponibilidad de una propiedad dinámica para operaciones de bucle.
Object
 Inherited
Devuelve la representación de cadena de este objeto, con formato según las convenciones específicas de configuración regional.
Object
 Inherited
Devuelve la representación de cadena del objeto especificado.
Object
 Inherited
Devuelve el valor simple del objeto especificado.
Object
Métodos protegidos
 MétodoDefinido por
  
Generic event handler.
AccImpl
  
Returns the name of the accessible component.
AccImpl
  
getState(childID:uint):uint
Utility method to determine state of the accessible component.
AccImpl
Información sobre propiedades

eventsToHandle

propiedad
eventsToHandle:Array  [solo lectura]

Versión del lenguaje: ActionScript 3.0
Versión de producto: Flex 3
Versiones de motor de ejecución: Flash Player 9, AIR 1.1

All subclasses must override this function by returning an array of strings of the events to listen for.



Implementación
    protected function get eventsToHandle():Array

master

propiedad 
protected var master:UIComponent

Versión del lenguaje: ActionScript 3.0
Versión de producto: Flex 3
Versiones de motor de ejecución: Flash Player 9, AIR 1.1

A reference to the UIComponent instance that this AccImpl instance is making accessible.

role

propiedad 
protected var role:uint

Versión del lenguaje: ActionScript 3.0
Versión de producto: Flex 3
Versiones de motor de ejecución: Flash Player 9, AIR 1.1

Accessibility role of the component being made accessible.

Información sobre constructores

AccImpl

()Información sobre
public function AccImpl(master:UIComponent)

Versión del lenguaje: ActionScript 3.0
Versión de producto: Flex 3
Versiones de motor de ejecución: Flash Player 9, AIR 1.1

Constructor.

Parámetros
master:UIComponent — The UIComponent instance that this AccImpl instance is making accessible.
Información sobre métodos

eventHandler

()método
protected function eventHandler(event:Event):void

Versión del lenguaje: ActionScript 3.0
Versión de producto: Flex 3
Versiones de motor de ejecución: Flash Player 9, AIR 1.1

Generic event handler. All AccImpl subclasses must implement this to listen for events from its master component.

Parámetros

event:Event

getFormName

()método 
public static function getFormName(component:UIComponent):String

Versión del lenguaje: ActionScript 3.0
Versión de producto: Flex 3
Versiones de motor de ejecución: Flash Player 9, AIR 1.1

Method for supporting Form Accessibility. Called from get_accName() in this AccImpl class. Also called from the UIComponentAccProps constructor.

Parámetros

component:UIComponent

Valor devuelto
String

getName

()método 
protected function getName(childID:uint):String

Versión del lenguaje: ActionScript 3.0
Versión de producto: Flex 3
Versiones de motor de ejecución: Flash Player 9, AIR 1.1

Returns the name of the accessible component. All subclasses must implement this instead of implementing get_accName().

Parámetros

childID:uint

Valor devuelto
String

getState

()método 
protected function getState(childID:uint):uint

Versión del lenguaje: ActionScript 3.0
Versión de producto: Flex 3
Versiones de motor de ejecución: Flash Player 9, AIR 1.1

Utility method to determine state of the accessible component.

Parámetros

childID:uint

Valor devuelto
uint

isAncestorDisabled

()método 
public static function isAncestorDisabled(component:UIComponent):Boolean

Returns true if an ancestor of the component has enabled set to false. The given component itself is not checked.

Parámetros

component:UIComponent — The UIComponent to check for a disabled ancestor.

Valor devuelto
Boolean — true if the component has a disabled ancestor.




[ X ]¿Por qué hay texto en inglés?
Cierto contenido de la Referencia de ActionScript 3.0 se muestra en inglés

No todo el contenido de la Referencia de ActionScript 3.0 se traduce a todos los idiomas. Si un elemento del lenguaje no se traduce, aparecerá en inglés. Por ejemplo, la clase ga.controls.HelpBox no está traducida en ningún idioma. Por lo tanto, en la versión en español de la referencia, la clase ga.controls.HelpBox aparecerá en inglés.