spark.accessibility.ButtonBarBaseAccImpl - Adobe® Flex® 4 Language Reference (Flex 4)

Package	spark.accessibility
Class	public class ButtonBarBaseAccImpl
Inheritance	ButtonBarBaseAccImpl ListBaseAccImpl AccImpl AccessibilityImplementation Object
Subclasses	TabBarAccImpl

Language Version:

ActionScript 3.0

Product Version:

Flex 4

Runtime Versions:

Flash Player 10, AIR 1.5

ButtonBarBaseAccImpl is the accessibility implementation class for spark.components.supportClasses.ButtonBarBase.

Although TabBar has its own accessibility implementation subclass, ButtonBar simply uses the one for ButtonBarBase. Therefore, the rest of this description refers to the commonly-used ButtonBar component rather than the ButtonBarBase base class.

When a Spark ButtonBar 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 ButtonBar. 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 ButtonBar are its buttons. As described below, the accessibility of these Buttons is managed by the ButtonBar; their own accessibilityImplementation and accessibilityProperties are ignored by the Flash Player.

Role

The MSAA Role of a ButtonBar is ROLE_SYSTEM_TOOLBAR.

The Role of each Button in the ButtonBar is ROLE_SYSTEM_PUSHBUTTON.

Name

The MSAA Name of a ButtonBar 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 ButtonBar's accessibilityName property.

The Name of each Button is determined by the ButtonBar's itemToLabel() method.

When the Name of the ButtonBar or one of its Buttons changes, a ButtonBar dispatches the MSAA event EVENT_OBJECT_NAMECHANGE with the proper childID for the Button or 0 for itself.

Description

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

The Description of each Button is the empty string.

State

The MSAA State of a ButtonBar 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 ButtonBar has focus)

The State of a Button in a ButtonBar is a combination of:

STATE_SYSTEM_FOCUSED (when it has focus)
STATE_SYSTEM_PRESSED (when it is selected)

When the State of the ButtonBar or one of its Buttons changes, a ButtonBar dispatches the MSAA event EVENT_OBJECT_STATECHANGE with the proper childID for the Button or 0 for itself.

Value

A ButtonBar, or a Button in a ButtonBar, does not have an MSAA Value.

Location

The MSAA Location of a ButtonBar, or a Button in a ButtonBar, is its bounding rectangle.

Default Action

A ButtonBar does not have an MSAA DefaultAction.

The DefaultAction for a Button in a ButtonBar is "Press".

Focus

Both the ButtonBar and its individual buttons accept focus. When they do so it dispatches the MSAA event EVENT_OBJECT_FOCUS. A button is not automatically selected when focused through arrow key navigation. To select a focused button, the user must press the spacebar.

Selection

MSAA Selection will press the button corresponding to the specified childID. Only one button can be pressed at a time.

Public Properties

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	Property		Defined By
		constructor : Object A reference to the class object or constructor function for a given object instance.	Object
		errno : uint Errors are indicated out-of-band, rather than in return values.	AccessibilityImplementation
		prototype : Object [static] A reference to the prototype object of a class or function object.	Object
		stub : Boolean If a component is released without an ActionScript accessibility implementation, it is strongly suggested that a component accessibility stub be included.	AccessibilityImplementation

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
		ButtonBarBaseAccImpl(master:UIComponent) Constructor.	ButtonBarBaseAccImpl
		accDoDefaultAction(childID:uint):void An IAccessible method that performs the default action associated with the component that this AccessibilityImplementation represents or of one of its child elements.	AccessibilityImplementation
		accLocation(childID:uint):* MSAA method for returning a DisplayObject or Rectangle specifying the bounding box of a child element in the AccessibilityImplementation.	AccessibilityImplementation
		accSelect(selFlag:uint, childID:uint):void IAccessible method for altering the selection in the component that this AccessibilityImplementation represents.	AccessibilityImplementation
		enableAccessibility():void [static] Enables accessibility in the ButtonBarBase class.	ButtonBarBaseAccImpl
		get_accDefaultAction(childID:uint):String MSAA method for returning the default action of the component that this AccessibilityImplementation represents or of one of its child elements.	AccessibilityImplementation
		get_accFocus():uint MSAA method for returning the unsigned integer ID of the child element, if any, that has child focus within the component.	AccessibilityImplementation
		get_accName(childID:uint):String MSAA method for returning the name for the component that this AccessibilityImplementation represents or for one of its child elements.	AccessibilityImplementation
		get_accRole(childID:uint):uint MSAA method for returning the system role for the component that this AccessibilityImplementation represents or for one of its child elements.	AccessibilityImplementation
		get_accSelection():Array MSAA method for returning an array containing the IDs of all child elements that are selected.	AccessibilityImplementation
		get_accState(childID:uint):uint IAccessible method for returning the current runtime state of the component that this AccessibilityImplementation represents or of one of its child elements.	AccessibilityImplementation
		get_accValue(childID:uint):String MSAA method for returning the runtime value of the component that this AccessibilityImplementation represents or of one of its child elements.	AccessibilityImplementation
		getChildIDArray():Array Returns an array containing the unsigned integer IDs of all child elements in the AccessibilityImplementation.	AccessibilityImplementation
		getFormName(component:UIComponent):String [static] Method for supporting Form Accessibility.	AccImpl
		hasOwnProperty(name:String):Boolean Indicates whether an object has a specified property defined.	Object
		isAncestorDisabled(component:UIComponent):Boolean [static] Method for supporting state Accessibility.	AccImpl
		isPrototypeOf(theClass:Object):Boolean Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.	Object
		propertyIsEnumerable(name:String):Boolean Indicates whether the specified property exists and is enumerable.	Object
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Sets the availability of a dynamic property for loop operations.	Object
		toLocaleString():String Returns the string representation of this object, formatted according to locale-specific conventions.	Object
		toString():String Returns the string representation of the specified object.	Object
		valueOf():Object Returns the primitive value of the specified object.	Object

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

ButtonBarBaseAccImpl

()

Constructor

public function ButtonBarBaseAccImpl(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 ButtonBarBase class.

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