ComboBoxAccImpl

套件	spark.accessibility
類別	public class ComboBoxAccImpl
繼承	ComboBoxAccImpl DropDownListBaseAccImpl ListBaseAccImpl AccImpl AccessibilityImplementation Object

語言版本:

ActionScript 3.0

產品版本:

Flex 4

執行階段版本:

Flash Player 10, AIR 1.5

ComboBoxAccImpl is the accessibility implementation class for spark.components.ComboBox.

When a Spark ComboBox 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 ComboBox. 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 ComboBox are its editable TextInput (with childID 1) and its list items (with childIDs 2, 3, ... n). The number of children is one plus the number of items in the dataProvider (not one plus the the number of visible renderers).

As described below, the accessibility of the TextInput and the list items is managed by the ComboBox; their accessibilityImplementation and accessibilityProperties are ignored by the Flash Player.

Role

The MSAA Role of a ComboBox is ROLE_SYSTEM_COMBOBOX.

The MSAA Role of the editable TextInput is ROLE_SYSTEM_TEXT.

The Role of each list item is ROLE_SYSTEM_LISTITEM.

Name

The MSAA Name of a ComboBox (as well as its editable TextInput) 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 ComboBox's accessibilityName property.

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

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

The Description of each list item is the empty string.

State

The MSAA State of a ComboBox 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 ComboBox has focus)
STATE_SYSTEM_EXPANDED (when it is open)
STATE_SYSTEM_COLLAPSED (when it is closed)

The State of the editable TextInput 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 ComboBox has focus)

The State of a list item is a combination of:

STATE_SYSTEM_FOCUSABLE
STATE_SYSTEM_FOCUSED (when it has focus)
STATE_SYSTEM_SELECTABLE
STATE_SYSTEM_SELECTED (when it is selected)

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

Value

The MSAA Value of a ComboBox is the MSAA Name of the currently selected list item or the text entered into the TextInput.

The Value of a list item is always the empty string.

When the Value of the ComboBox changes, a ComboBox dispatches the MSAA event EVENT_OBJECT_VALUECHANGE.

Location

The MSAA Location of a ComboBox, its TextInput, or one of its list items is its bounding rectangle.

Default Action

Neither the ComboBox or it's TextInput have an MSAA DefaultAction.

The DefaultAction of a list item is "Double Click". Performing this action will select the item.

Focus

The ComboBox itself can receive focus, as well as its list items (either while the ComboBox is collapsed or expanded).

Selection

The ComboBox allows a single item to be selected, in which case an EVENT_OBJECT_SELECTION event is fired.

公用屬性

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	屬性		定義自
		constructor : Object 類別物件的參照或是特定物件實體的建構函數。	Object
		errno : uint 指出錯誤碼。	AccessibilityImplementation
		stub : Boolean 用於建立組件輔助功能虛設常式。	AccessibilityImplementation

保護屬性

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	屬性		定義自
		eventsToHandle : Array [唯讀] 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

公用方法

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	方法		定義自
		ComboBoxAccImpl(master:UIComponent) Constructor.	ComboBoxAccImpl
		accDoDefaultAction(childID:uint):void IAccessible 方法會執行與組件關聯的預設動作，而該組件是由此 AccessibilityImplementation 或其子元素之一所代表。	AccessibilityImplementation
		accLocation(childID:uint):* MSAA 方法適用於傳回 DisplayObject 或 Rectangle，以便在 AccessibilityImplementation 中指定子系元素的範圍框。	AccessibilityImplementation
		accSelect(operation:uint, childID:uint):void 用於改變組件中之選擇的 IAccessible 方法，該組件是由此 AccessibilityImplementation 所代表。	AccessibilityImplementation
		enableAccessibility():void [靜態] Enables accessibility in the ComboBox class.	ComboBoxAccImpl
		get_accDefaultAction(childID:uint):String 傳回組件預設動作的 MSAA 方法，該組件是由此 AccessibilityImplementation 或其子元素之一所代表。	AccessibilityImplementation
		get_accFocus():uint 傳回子元素 (如果有的話) 無正負號整數 ID 的 MSAA 方法，該子元素在組件中具有子元素焦點。	AccessibilityImplementation
		get_accName(childID:uint):String 傳回組件名稱的 MSAA 方法，該組件是由此 AccessibilityImplementation 或其子元素之一所代表。	AccessibilityImplementation
		get_accRole(childID:uint):uint 傳回組件系統角色的 MSAA 方法，該組件是由此 AccessibilityImplementation 或其子元素之一所代表。	AccessibilityImplementation
		get_accSelection():Array 傳回陣列的 MSAA 方法，該陣列包含所有選取子元素的 ID。	AccessibilityImplementation
		get_accState(childID:uint):uint 傳回組件目前執行階段狀態的 IAccessible 方法，該組件是由此 AccessibilityImplementation 或其子元素之一所代表。	AccessibilityImplementation
		get_accValue(childID:uint):String 傳回組件執行階段值的 MSAA 方法，該組件是由此 AccessibilityImplementation 或其子元素之一所代表。	AccessibilityImplementation
		get_selectionActiveIndex():*	AccessibilityImplementation
		get_selectionAnchorIndex():*	AccessibilityImplementation
		getChildIDArray():Array 傳回陣列，其中包含 AccessibilityImplementation 所有子元素的無正負號整數 ID。	AccessibilityImplementation
		getFormName(component:UIComponent):String [靜態] Method for supporting Form Accessibility.	AccImpl
		hasOwnProperty(name:String):Boolean 指出物件是否有已定義的指定屬性。	Object
		isAncestorDisabled(component:UIComponent):Boolean [靜態] Returns true if an ancestor of the component has enabled set to false.	AccImpl
		isLabeledBy(labelBounds:Rectangle):Boolean 傳回 true 或 false，以指出具有由 x、y、width 與 height 所指定之範圍框的文字物件，是否應該被視為此 AccessibilityImplementation 所代表之組件的標籤。	AccessibilityImplementation
		isPrototypeOf(theClass:Object):Boolean 指出 Object 類別的實體是否位於指定為參數的物件原型鏈中。	Object
		propertyIsEnumerable(name:String):Boolean 指出指定的屬性是否存在，以及是否可列舉。	Object
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void 為迴圈作業設定動態屬性的可用性。	Object
		toLocaleString():String 傳回代表此物件的字串，根據地區特定慣例進行格式化。	Object
		toString():String 會傳回指定之物件的字串形式。	Object
		valueOf():Object 會傳回指定之物件的基本值。	Object

保護方法

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	方法		定義自
		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

建構函式詳細資料

()

建構函式

public function ComboBoxAccImpl(master:UIComponent)

語言版本:

ActionScript 3.0

產品版本:

Flex 4

執行階段版本:

Flash Player 10, AIR 1.5

Constructor.

參數

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

方法詳細資訊

enableAccessibility

()

方法

public static function enableAccessibility():void

語言版本:

ActionScript 3.0

產品版本:

Flex 4

執行階段版本:

Flash Player 10, AIR 1.5

Enables accessibility in the ComboBox class.

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

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ComboBoxAccImpl - AS3 Flex

類別 x

ComboBoxAccImpl

enableAccessibility