Packagespark.accessibility
Classpublic class ButtonBaseAccImpl
InheritanceButtonBaseAccImpl Inheritance AccImpl Inheritance flash.accessibility.AccessibilityImplementation
Subclasses CheckBoxAccImpl, ToggleButtonAccImpl

Language Version : ActionScript 3.0
Product Version : Flex 4
Runtime Versions : Flash Player 10, AIR 1.5

ButtonBaseAccImpl is the accessibility implementation class for spark.components.supportClasses.ButtonBase.

Although ToggleButton, CheckBox, and RadioButton have their own accessibility implementation subclasses, Button simply uses the one for ButtonBase. Therefore, the rest of this description refers to the commonly-used Button component rather than the ButtonBase base class.

When a Spark Button 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 Button. See the mx.accessibility.AccImpl and flash.accessibility.AccessibilityImplementation classes for background information about accessibility implementation classes and MSAA.

Children

A Button has no MSAA children.

Role

The MSAA Role of a Button is ROLE_SYSTEM_PUSHBUTTON.

Name

The MSAA Name of a Button is, by default, the label that it displays. When wrapped in a FormItem element, this label will be combined with the FormItem's label. To override this behavior, set the Button's accessibilityName property.

When the Name changes, a Button dispatches the MSAA event EVENT_OBJECT_NAMECHANGE.

Description

The MSAA Description of a Button is, by default, the empty string, but you can set the Button's accessibilityDescription property.

State

The MSAA State of a Button is a combination of:

When the State changes, a Button dispatches the MSAA event EVENT_OBJECT_STATECHANGE.

Value

A Button does not have an MSAA Value.

Location

The MSAA Location of a Button is its bounding rectangle.

Default Action

The MSAA DefaultAction of a Button is "Press".

When an MSAA client tells the Button to perform this action, KEY_DOWN and KEY_UP MouseEvents for the SPACE key are generated, to simulate pressing the ButtonBase via the keyboard, if the Button is enabled.

Focus

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

Selection

A Button does not support selection in the MSAA sense.



Protected Properties
 PropertyDefined By
 InheritedeventsToHandle : Array
[read-only] All subclasses must override this function by returning an array of strings of the events to listen for.
AccImpl
 Inheritedmaster : UIComponent
A reference to the UIComponent instance that this AccImpl instance is making accessible.
AccImpl
 Inheritedrole : uint
Accessibility role of the component being made accessible.
AccImpl
Public Methods
 MethodDefined By
  
Constructor.
ButtonBaseAccImpl
  
[static] Enables accessibility in the Button class.
ButtonBaseAccImpl
 Inherited
getFormName(component:UIComponent):String
[static] Method for supporting Form Accessibility.
AccImpl
 Inherited
isAncestorDisabled(component:UIComponent):Boolean
[static] Returns true if an ancestor of the component has enabled set to false.
AccImpl
Protected Methods
 MethodDefined By
 Inherited
eventHandler(event:Event):void
Generic event handler.
AccImpl
 Inherited
getName(childID:uint):String
Returns the name of the accessible component.
AccImpl
 Inherited
getState(childID:uint):uint
Utility method to determine state of the accessible component.
AccImpl
Constructor Detail
ButtonBaseAccImpl()Constructor
public function ButtonBaseAccImpl(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 Button class.

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