| Paquete | spark.accessibility |
| Clase | public class DropDownListBaseAccImpl |
| Herencia | DropDownListBaseAccImpl  ListBaseAccImpl AccImpl AccessibilityImplementation Object |
| Subclases | ComboBoxAccImpl |
| Versión del lenguaje: | ActionScript 3.0 |
| Versión de producto: | Flex 4 |
| Versiones de motor de ejecución: | Flash Player 10, AIR 1.5 |
Although ComboBox has its own accessibility implementation subclass, DropDownList simply uses the one for DropDownListBase. Therefore, the rest of this description refers to the commonly-used DropDownList component rather than the DropDownListBase base class.
When a Spark DropDownList is created,
its accessibilityImplementation property
is set to an instance of this class.
The Flash Player then uses this class to allow MSAA clients
such as screen readers to see and manipulate the DropDownList.
See the mx.accessibility.AccImpl and
flash.accessibility.AccessibilityImplementation classes
for background information about accessibility implementation
classes and MSAA.
Children
The MSAA children of a DropDownList are its list items.
The number of children is the number of items
in the dataProvider
not just the number of visible renderers.
As described below, the accessibility of the list items
is managed by the DropDownList;
the accessibilityImplementation
and accessibilityProperties of the item renderers
are ignored by the Flash Player.
Role
The MSAA Role of a DropDownList is ROLE_SYSTEM_COMBOBOX.
The Role of each list item is ROLE_SYSTEM_LISTITEM.
Name
The MSAA Name of a DropDownList is, by default, an empty string.
When wrapped in a FormItem element, the Name is the FormItem's label.
To override this behavior,
set the DropDownList's accessibilityName property.
The Name of each list item is determined by the DropDownList's
itemToLabel() method.
When the Name of the DropDownList or one of its items changes, a DropDownList dispatches the MSAA event EVENT_OBJECT_NAMECHANGE with the proper childID for a list item or 0 for itself.
Description
The MSAA Description of a DropDownList is, by default,
an empty string, but you can set the DropDownList's
accessibilityDescription property.
The Description of each list item is the empty string.
State
The MSAA State of a DropDownList is a combination of:
- STATE_SYSTEM_UNAVAILABLE (when enabled is false)
- STATE_SYSTEM_FOCUSABLE (when enabled is true)
- STATE_SYSTEM_FOCUSED (when enabled is true and the DropDownList has focus)
- STATE_SYSTEM_EXPANDED (when it is open)
- STATE_SYSTEM_COLLAPSED (when it is closed)
The State of a list item is a combination of:
- STATE_SYSTEM_FOCUSABLE
- STATE_SYSTEM_FOCUSED (when it has focus)
- STATE_SYSTEM_SELECTABLE
- STATE_SYSTEM_SELECTED (when it is selected)
When the State of the DropDownList or one of its list items changes, a DropDownList dispatches the MSAA event EVENT_OBJECT_STATECHANGE with the proper childID for the list item or 0 for itself.
Value
The MSAA Value of a DropDownList is the MSAA Name of the currently selected list item.
The Value of each list item is the empty string.
When the Value of the DropDownList changes, it dispatches the MSAA event EVENT_OBJECT_VALUECHANGE.
Location
The MSAA Location of a DropDownList or a list item is its bounding rectangle.
Default Action
A DropDownList does not have an MSAA DefaultAction
The DefaultAction of a list item is "Double click".
Focus
The DropDownList itself can receive focus, as well as its list items (either while the DropDownList is collapsed or expanded). The EVENT_OBJECT_FOCUS is fired when this happens.
Selection
The DropDownList allows a single item to be selected, in which case an EVENT_OBJECT_SELECTION event is fired.
Ocultar propiedades públicas heredadas
Mostrar propiedades públicas heredadas| Método | Definido por | ||
|---|---|---|---|
DropDownListBaseAccImpl(master:UIComponent)
Constructor. | DropDownListBaseAccImpl | ||
 |
Un método IAccessible que realiza la acción predeterminada asociada al componente que este objeto AccessibilityImplementation representa o de uno de sus elementos secundarios. | AccessibilityImplementation | |
|
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 | |
|
Método IAccessible para modificar la selección en el componente que este AccessibilityImplementation representa. | AccessibilityImplementation | |
[estática]
Enables accessibility in the DropDownListBase class. | DropDownListBaseAccImpl | ||
|
Método MSAA para devolver la acción predeterminada del componente que este AccessibilityImplementation representa o de uno de sus elementos secundarios. | AccessibilityImplementation | |
|
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 | |
|
Método MSAA para devolver el nombre del componente que este AccessibilityImplementation representa o de uno de sus elementos secundarios. | AccessibilityImplementation | |
|
Método MSAA para devolver la función del sistema del componente que este AccessibilityImplementation representa o de uno de sus elementos secundarios. | AccessibilityImplementation | |
|
Método MSAA para devolver un conjunto que contiene el ID de todos los elementos secundarios que se hayan seleccionado. | AccessibilityImplementation | |
|
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 | |
|
Método MSAA para devolver el valor del motor de ejecución del componente que este AccessibilityImplementation representa o de uno de sus elementos secundarios. | AccessibilityImplementation | |
| AccessibilityImplementation | ||
| AccessibilityImplementation | ||
|
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 | |
|
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 | |
|
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 | |
|
Indica si hay una instancia de la clase Object en la cadena de prototipo del objeto especificado como parámetro. | Object | |
|
Indica si existe la propiedad especificada y si es enumerable. | Object | |
|
Establece la disponibilidad de una propiedad dinámica para operaciones de bucle. | Object | |
|
Devuelve la representación de cadena de este objeto, con formato según las convenciones específicas de configuración regional. | Object | |
|
Devuelve la representación de cadena del objeto especificado. | Object | |
|
Devuelve el valor simple del objeto especificado. | Object | |
DropDownListBaseAccImpl | () | Información sobre |
public function DropDownListBaseAccImpl(master:UIComponent)| Versión del lenguaje: | ActionScript 3.0 |
| Versión de producto: | Flex 4 |
| Versiones de motor de ejecución: | Flash Player 10, AIR 1.5 |
Constructor.
Parámetrosmaster:UIComponent — The UIComponent instance that this AccImpl instance
is making accessible.
|
enableAccessibility | () | método |
public static function enableAccessibility():void| Versión del lenguaje: | ActionScript 3.0 |
| Versión de producto: | Flex 4 |
| Versiones de motor de ejecución: | Flash Player 10, AIR 1.5 |
Enables accessibility in the DropDownListBase class.
This method is called by application startup code
that is autogenerated by the MXML compiler.
Afterwards, when instances of DropDownListBase are initialized,
their accessibilityImplementation property
will be set to an instance of this class.
Tue Jun 12 2018, 02:12 PM Z