Adobe® Flex® 4 Language Reference
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spark.accessibility 
ButtonBaseAccImpl 
Packagespark.accessibility
Classpublic class ButtonBaseAccImpl
InheritanceButtonBaseAccImpl Inheritance AccImpl Inheritance AccessibilityImplementation Inheritance Object
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:

  • STATE_SYSTEM_UNAVAILABLE (when enabled is false)
  • STATE_SYSTEM_FOCUSABLE (when enabled is true)
  • STATE_SYSTEM_FOCUSED (when enabled is true and the Button has focus)

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.



Public Properties
 PropertyDefined By
 Inheritedconstructor : Object
A reference to the class object or constructor function for a given object instance.
Object
 Inheritederrno : uint
Indicates an error code.
AccessibilityImplementation
 Inheritedprototype : Object
[static] A reference to the prototype object of a class or function object.
Object
 Inheritedstub : Boolean
Used to create a component accessibility stub.
AccessibilityImplementation
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
 Inherited
An IAccessible method that performs the default action associated with the component that this AccessibilityImplementation represents or of one of its child elements.
AccessibilityImplementation
 Inherited
accLocation(childID:uint):*
MSAA method for returning a DisplayObject or Rectangle specifying the bounding box of a child element in the AccessibilityImplementation.
AccessibilityImplementation
 Inherited
accSelect(operation:uint, childID:uint):void
IAccessible method for altering the selection in the component that this AccessibilityImplementation represents.
AccessibilityImplementation
  
[static] Enables accessibility in the Button class.
ButtonBaseAccImpl
 Inherited
MSAA method for returning the default action of the component that this AccessibilityImplementation represents or of one of its child elements.
AccessibilityImplementation
 Inherited
MSAA method for returning the unsigned integer ID of the child element, if any, that has child focus within the component.
AccessibilityImplementation
 Inherited
MSAA method for returning the name for the component that this AccessibilityImplementation represents or for one of its child elements.
AccessibilityImplementation
 Inherited
MSAA method for returning the system role for the component that this AccessibilityImplementation represents or for one of its child elements.
AccessibilityImplementation
 Inherited
MSAA method for returning an array containing the IDs of all child elements that are selected.
AccessibilityImplementation
 Inherited
IAccessible method for returning the current runtime state of the component that this AccessibilityImplementation represents or of one of its child elements.
AccessibilityImplementation
 Inherited
MSAA method for returning the runtime value of the component that this AccessibilityImplementation represents or of one of its child elements.
AccessibilityImplementation
 Inherited
Returns an array containing the unsigned integer IDs of all child elements in the AccessibilityImplementation.
AccessibilityImplementation
 Inherited
[static] Method for supporting Form Accessibility.
AccImpl
 Inherited
Indicates whether an object has a specified property defined.
Object
 Inherited
[static] Method for supporting state Accessibility.
AccImpl
 Inherited
Returns true or false to indicate whether a text object having a bounding box specified by a x, y, width, and height should be considered a label for the component that this AccessibilityImplementation represents.
AccessibilityImplementation
 Inherited
Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.
Object
 Inherited
Indicates whether the specified property exists and is enumerable.
Object
 Inherited
Sets the availability of a dynamic property for loop operations.
Object
 Inherited
Returns the string representation of this object, formatted according to locale-specific conventions.
Object
 Inherited
Returns the string representation of the specified object.
Object
 Inherited
Returns the primitive value of the specified object.
Object
Protected Methods
 MethodDefined By
 Inherited
Generic event handler.
AccImpl
 Inherited
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.