| Paket | spark.accessibility |
| Klass | public class DropDownListBaseAccImpl |
| Arv | DropDownListBaseAccImpl  ListBaseAccImpl AccImpl AccessibilityImplementation Object |
| Underklasser | ComboBoxAccImpl |
| Språkversion: | ActionScript 3.0 |
| Produktversion: | Flex 4 |
| Körningsmiljöversioner: | Flash Player 10, AIR 1.5 |
Although ComboBox has its own accessibility implementation subclass, DropDownList simply uses the one for DropDownListBase. Therefore, the rest of this description refers to the commonly-used DropDownList component rather than the DropDownListBase base class.
When a Spark DropDownList 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 DropDownList.
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 DropDownList are its list items.
The number of children is the number of items
in the dataProvider
not just the number of visible renderers.
As described below, the accessibility of the list items
is managed by the DropDownList;
the accessibilityImplementation
and accessibilityProperties of the item renderers
are ignored by the Flash Player.
Role
The MSAA Role of a DropDownList is ROLE_SYSTEM_COMBOBOX.
The Role of each list item is ROLE_SYSTEM_LISTITEM.
Name
The MSAA Name of a DropDownList 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 DropDownList's accessibilityName property.
The Name of each list item is determined by the DropDownList's
itemToLabel() method.
When the Name of the DropDownList or one of its items changes, a DropDownList 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 DropDownList is, by default,
an empty string, but you can set the DropDownList's
accessibilityDescription property.
The Description of each list item is the empty string.
State
The MSAA State of a DropDownList 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 DropDownList has focus)
- STATE_SYSTEM_EXPANDED (when it is open)
- STATE_SYSTEM_COLLAPSED (when it is closed)
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 DropDownList or one of its list items changes, a DropDownList dispatches the MSAA event EVENT_OBJECT_STATECHANGE with the proper childID for the list item or 0 for itself.
Value
The MSAA Value of a DropDownList is the MSAA Name of the currently selected list item.
The Value of each list item is the empty string.
When the Value of the DropDownList changes, it dispatches the MSAA event EVENT_OBJECT_VALUECHANGE.
Location
The MSAA Location of a DropDownList or a list item is its bounding rectangle.
Default Action
A DropDownList does not have an MSAA DefaultAction
The DefaultAction of a list item is "Double click".
Focus
The DropDownList itself can receive focus, as well as its list items (either while the DropDownList is collapsed or expanded). The EVENT_OBJECT_FOCUS is fired when this happens.
Selection
The DropDownList allows a single item to be selected, in which case an EVENT_OBJECT_SELECTION event is fired.
Dölj ärvda publika egenskaper
Visa ärvda publika egenskaper| Metod | Definieras med | ||
|---|---|---|---|
DropDownListBaseAccImpl(master:UIComponent)
Constructor. | DropDownListBaseAccImpl | ||
 |
En IAccessible-metod som utför standardåtgärden som är associerad med komponenten som denna AccessibilityImplementation representerar eller ett av dess underordnade element. | AccessibilityImplementation | |
|
Metoden MSAA för att returnera ett DisplayObject eller Rectangle som anger begränsningsramen för ett underordnat element i AccessibilityImplementation. | AccessibilityImplementation | |
|
Metoden IAccessible för att ändra markeringen i komponenten som denna AccessibilityImplementation representerar. | AccessibilityImplementation | |
[statisk]
Enables accessibility in the DropDownListBase class. | DropDownListBaseAccImpl | ||
|
MSAA-metod för att returnera standardåtgärden för komponenten som denna AccessibilityImplementation representerar eller för ett av dess underordnade element. | AccessibilityImplementation | |
|
MSAA-metod för att returnera eventuellt heltals-ID utan tecken för det underordnade elementet, som har underordnat fokus inom komponenten. | AccessibilityImplementation | |
|
MSAA-metod för att returnera namnet på komponenten som denna AccessibilityImplementation representerar eller för ett av dess underordnade element. | AccessibilityImplementation | |
|
MSAA-metod för att returnera systemrollen för komponenten som denna AccessibilityImplementation representerar eller för ett av dess underordnade element. | AccessibilityImplementation | |
|
MSAA-metod för att returnera en matris som innehåller ID:n för alla underordnade element som är markerade. | AccessibilityImplementation | |
|
IAccessible-metod för att returnera det aktuella körningsläget för komponenten som denna AccessibilityImplementation representerar eller ett av dess underordnade element. | AccessibilityImplementation | |
|
MSAA-metod för att returnera körtidsvärdet för komponenten som denna AccessibilityImplementation representerar eller för ett av dess underordnade element. | AccessibilityImplementation | |
| AccessibilityImplementation | ||
| AccessibilityImplementation | ||
|
Returnerar en matris som innehåller heltals-ID:n utan tecken för alla underordnade element i AccessibilityImplementation. | AccessibilityImplementation | |
| [statisk]
Method for supporting Form Accessibility. | AccImpl | |
|
Anger om det finns en egenskap angiven för ett objekt. | Object | |
| [statisk]
Returns true if an ancestor of the component has enabled set to false. | AccImpl | |
|
Returnerar true eller false för att ange om ett textobjekt som har en begränsningsram som anges med x, y, width och height, ska anses som en etikett för komponenten som denna AccessibilityImplementation representerar. | AccessibilityImplementation | |
|
Anger om en instans av klassen Object finns i prototypkedjan för objektet som anges som parameter. | Object | |
|
Anger om den angivna egenskapen finns och är uppräkningsbar. | Object | |
|
Anger tillgänglighet för en dynamisk egenskap för slingåtgärder. | Object | |
|
Returnerar det här objektets strängrepresentation, formaterad i enlighet med språkspecifika konventioner. | Object | |
|
Returnerar det angivna objektets strängbeteckning. | Object | |
|
Returnerar det angivna objektets primitiva värde. | Object | |
DropDownListBaseAccImpl | () | Konstruktor |
public function DropDownListBaseAccImpl(master:UIComponent)| Språkversion: | ActionScript 3.0 |
| Produktversion: | Flex 4 |
| Körningsmiljöversioner: | Flash Player 10, AIR 1.5 |
Constructor.
Parametrarmaster:UIComponent — The UIComponent instance that this AccImpl instance
is making accessible.
|
enableAccessibility | () | metod |
public static function enableAccessibility():void| Språkversion: | ActionScript 3.0 |
| Produktversion: | Flex 4 |
| Körningsmiljöversioner: | Flash Player 10, AIR 1.5 |
Enables accessibility in the DropDownListBase class.
This method is called by application startup code
that is autogenerated by the MXML compiler.
Afterwards, when instances of DropDownListBase are initialized,
their accessibilityImplementation property
will be set to an instance of this class.
Tue Jun 12 2018, 01:40 PM Z