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

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

Language Version:

ActionScript 3.0

Product Version:

Flex 4

Runtime Versions:

Flash Player 10, AIR 1.5

TabBarAccImpl is the accessibility implementation class for spark.components.TabBar.

When a Spark TabBar 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 TabBar. 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 TabBar are its tabs. As described above, the accessibility of these tabs is managed by the TabBar; their own accessibilityImplementation and accessibilityProperties are ignored by the Flash Player.

Role

The MSAA Role of a TabBar is ROLE_SYSTEM_PAGETABLIST.

The Role of each tab is ROLE_SYSTEM_PAGETAB.

Name

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

The Name of each tab is determined by the TabBar's itemToLabel() method.

When the Name of the TabBar or one of its tabs changes, a TabBar dispatches the MSAA event EVENT_OBJECT_NAMECHANGE with the proper childID for the tab or 0 for itself.

Description

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

The Description of each tab is the empty string.

State

The MSAA State of a TabBar 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 TabBar has focus)

The State of a tab in a TabBar is a combination of:

STATE_SYSTEM_FOCUSED
STATE_SYSTEM_PRESSED

When the State of the TabBar or one of its tabs changes, a TabBar dispatches the MSAA event EVENT_OBJECT_STATECHANGE with the proper childID for the tab or 0 for itself.

Value

A TabBar, or a tab in a TabBar, does not have an MSAA Value.

Location

The MSAA Location of a TabBar, or a tab in a TabBar, is its bounding rectangle.

Default Action

A TabBar does not have an MSAA DefaultAction.

The DefaultAction of a tab in a TabBar is "Switch". When it is performed, the given tab is pressed.

Focus

Both the TabBar and its individual tabs accept focus. When they do so it dispatches the MSAA event EVENT_OBJECT_FOCUS. A tab is not automatically pressed when focused through arrow key navigation. To press a focused tab, the user must press the spacebar.

Selection

MSAA Selection will press the tab corresponding to the specified childID. Only one tab 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
		TabBarAccImpl(master:UIComponent) Constructor.	TabBarAccImpl
		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 TabBar class.	TabBarAccImpl
		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

TabBarAccImpl

()

Constructor

public function TabBarAccImpl(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 TabBar class.

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