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ListAccImpl

Package | spark.accessibility
Class | public class ListAccImpl
Inheritance | ListAccImpl ListBaseAccImpl AccImpl flash.accessibility.AccessibilityImplementation

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

ListAccImpl is the accessibility implementation class for spark.components.List.

When a Spark ListBase 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 List. 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 list 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 above, the accessibility of the list items is managed by the List; the `accessibilityImplementation` and `accessibilityProperties` of the item renderers are ignored by the Flash Player.

Role

The MSAA Role of a List is ROLE_SYSTEM_LIST.

The Role of each list item in the List is ROLE_SYSTEM_LISTITEM.

Name

The MSAA Name of a List 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 List's `accessibilityName` property.

The Name of each list item is determined by the List's `itemToLabel()` method.

When the Name of the List or one of its items changes, a List 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 List is, by default, an empty string, but you can set the List's `accessibilityDescription` property.

The Description of each list item is the empty string.

State

The MSAA State of a List 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 List has focus)
- STATE_SYSTEM_MULTISELECTABLE (when allowMultipleSelection is true)

The State of a list item is a combination of:

- STATE_SYSTEM_FOCUSABLE
- STATE_SYSTEM_FOCUSED (when focused)
- STATE_SYSTEM_SELECTABLE
- STATE_SYSTEM_SELECTED (when it has the caret)

When the State of the List or one of its items changes, a List dispatches the MSAA event EVENT_OBJECT_STATECHANGE with the proper childID for the list item or 0 for itself.

Value

A List or list item does not have an MSAA Value.

Location

The MSAA Location of a List or a list item is its bounding rectangle.

Default Action

A List does not have an MSAA DefaultAction.

The MSAA DefaultAction of a list item is "Double Click".

Performing the default action on a list item will cause it to be selected.

Focus

A List accepts focus. When it does so, it dispatches the MSAA event EVENT_OBJECT_FOCUS.

Selection

A List allows either a single or multiple list items to be selected, depending on the `allowMultipleSelection` property. When an item is selected, it dispatches MSAA event EVENT_OBJECT_SELECTION.

Protected Properties
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| Property | Defined By
--- | --- | ---
|  | eventsToHandle : Array [read-only] 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

Public Methods
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| Method | Defined By
--- | --- | ---
|  | ListAccImpl(master:UIComponent) Constructor. | ListAccImpl
|  | enableAccessibility():void [static] Enables accessibility in the List class. | ListAccImpl
|  | getFormName(component:UIComponent):String [static] Method for supporting Form Accessibility. | AccImpl
|  | isAncestorDisabled(component:UIComponent):Boolean [static] Returns true if an ancestor of the component has enabled set to false. | AccImpl

Protected Methods
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| Method | Defined By
--- | --- | ---
|  | eventHandler(event:Event):void Generic event handler. | AccImpl
|  | getName(childID:uint):String Returns the name of the accessible component. | AccImpl
|  | getState(childID:uint):uint Utility method to determine state of the accessible component. | AccImpl

Constructor Detail

ListAccImpl | () | Constructor

`public function ListAccImpl(master:UIComponent)`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

Constructor.

Parameters

| `master:UIComponent` — The UIComponent instance that this AccImpl instance is making accessible.

Method Detail

enableAccessibility | () | method

`public static function enableAccessibility():void`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

Enables accessibility in the List class.

This method is called by application startup code that is autogenerated by the MXML compiler. Afterwards, when instances of List are initialized, their `accessibilityImplementation` property will be set to an instance of this class.

Sun Mar 5 2017, 03:42 PM +11:00