Pacote | mx.accessibility |
Classe | public class AccImpl |
Herança | AccImpl AccessibilityImplementation Object |
Subclasses | AccordionHeaderAccImpl, ButtonAccImpl, ButtonBaseAccImpl, ComboBaseAccImpl, DateChooserAccImpl, DateFieldAccImpl, LabelAccImpl, ListBaseAccImpl, ListBaseAccImpl, MenuBarAccImpl, PanelAccImpl, PanelAccImpl, RichEditableTextAccImpl, SliderAccImpl, SliderBaseAccImpl, SpinnerAccImpl, TabBarAccImpl, TextBaseAccImpl, TreeAccImpl, VideoPlayerAccImpl |
Versão da linguagem: | ActionScript 3.0 |
Versão de produto: | Flex 3 |
Versões de runtime: | Flash Player 9, AIR 1.1 |
It is a subclass of the Flash Player's AccessibilityImplementation class.
When an MX or Spark component is created,
its accessibilityImplementation
property
is set to an instance of a subclass of this class.
The Flash Player then uses this object to allow MSAA clients
such as screen readers to see and manipulate the component.
See the flash.accessibility.AccessibilityImplementation class
for additional information about accessibility implementation
classes and MSAA.
Children
The Flash Player does not support
a true hierarchy of accessible objects.
If a DisplayObject has an accessibilityImplementation
object,
then the accessibilityImplementation
objects
of its children are ignored.
However, the Player does allow a component's accessibility implementation class
to expose MSAA information for its internal parts.
(For example, a List exposes MSAA information about its items.)
The number of children (internal parts)
and the child IDs used to identify them
are determined by the getChildIDArray()
method.
In the Player's AccessibilityImplementation base class,
this method simply returns null
.
Flex's AccImpl class overrides it to return an empty array.
It also provides a protected utility method,
createChildIDArray()
which subclasses with internal parts
can use in their overrides.
Role
The MSAA Role of a component and its internal parts
is determined by the get_accRole()
method.
In the Player's AccessibilityImplementation base class,
this method throws a runtime error,
since subclasses are expected to override it.
Flex's AccImpl class has a protected role
property
which subclasses generally set in their constructor,
and it overrides get_accRole()
to return this property.
Name
The MSAA Name of a component and its internal parts
is determined by the get_accName()
method.
In the Player's AccessibilityImplementation base class,
this method simply returns null
.
Flex's AccImpl class overrides it to construct a name as follows,
starting with an empty string
and separating added portions with a single space:
- If a simple child (e.g., combo or list box item) is being requested, only the child's default name is returned. The rest of the steps below apply only to the component itself (childID 0).
- If the component is inside a Form:
- If the Form has a FormHeading and the component is inside
a FormItem, the heading text is added.
Developers wishing to avoid this should set the
accessibilityName
of the FormHeading to a space (" "). - If the field is required, the locale-dependent string "required field" is added.
- If the component is inside a FormItem,
the FormItem label text is added.
Developers wishing to avoid this should set the
accessibilityName
of the FormItem to a space (" ").
- If the Form has a FormHeading and the component is inside
a FormItem, the heading text is added.
Developers wishing to avoid this should set the
- The component's name is then determined thus:
- If the component's
accessibilityName
(i.e.,accessibilityProperties.name
) is a space, no component name is added. - Otherwise, if the component's name is specified (i.e., is not null and not empty) then it is added.
- Otherwise, a protected
getName()
method, defined by AccImpl and implemented by each subclass, is called to provide a default name. (For example, ButtonAccImpl implementsgetName()
to specify that a Button's default name is the label that it displays.) If not empty, the return value ofgetName()
is added. - Otherwise (if
getName()
returned empty), if the component'stoolTip
property is set, that String is added. - If the component's
errorString
property is set, that String is added.
- If the component's
Description
The MSAA Description is determined solely by a component's
accessibilityProperties
object and not by its
accessibilityImplementation
object.
Therefore there is no logic in AccessibilityImplementation or AccImpl
or any subclasses of AccImpl related to the description.
The normal way to set the description in Flex is via the
accessibilityDescription
property on UIComponent,
which simply sets accessibilityProperties.description
.
State
The MSAA State of a component and its internal parts
is determined by the get_accState()
method.
In the Player's AccessibilityImplementation base class,
this method throws a runtime error,
since subclasses are expected to override it.
Flex's AccImpl class does not override it,
but provides a protected utility method, getState()
,
for subclasses to use in their overrides.
The getState()
method determines the state
as a combination of
- STATE_SYSTEM_UNAVAILABLE (when enabled is false on this component or any ancestor)
- STATE_SYSTEM_FOCUSABLE
- STATE_SYSTEM_FOCUSED (when the component itself is focused, not set for any subparts the component may have)
Value
The MSAA Value of a component and its internal parts
is determined by the get_accValue()
method.
In the Player's AccessibilityImplementation base class,
this method simply returns null
.
Flex's AccImpl class does not override it,
but subclasses for components like TextInput do.
Location
The MSAA Location for a component's internal parts,
but not the component itself,
is determined by the get_accLocation()
method.
This method is never called with a childID of 0;
instead, the Flash Player determines the MSAA Location of a component
based on its bounding rectangle as determined by getBounds()
.
Flex's AccImpl class does not override this method,
but subclasses for components with internal parts do.
Default Action
The MSAA DefaultAction for a component and its internal parts
is determined by the get_accDefaultAction()
method.
In the Player's AccessibilityImplementation base class,
this method simply returns null
.
Flex's AccImpl class does not override it,
but subclasses with default actions do.
These subclasses also override AccessibilityImplementation's
accDoDefaultAction()
method
to perform the default action that they advertise.
Other
The MSAA events EVENT_OBJECT_SHOW and EVENT_OBJECT_HIDE are sent when the object is shown or hidden. The corresponding states for these are covered by the Flash Player which does not render any MSAA components that are hidden. When the component is shown the states mentioned for AccImpl are used.
Propriedade | Definido por | ||
---|---|---|---|
eventsToHandle : Array [somente leitura]
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 |
Método | Definido por | ||
---|---|---|---|
AccImpl(master:UIComponent)
Constructor. | AccImpl | ||
Um método IAccessible que executa a ação padrão associada ao componente que esta AccessibilityImplementation representa ou um do seus elementos filho. | AccessibilityImplementation | ||
Método de MSAA para retornar um DisplayObject ou Retângulo que especifica a caixa delimitadora de um elemento de filho no AccessibilityImplementation. | AccessibilityImplementation | ||
Método IAccessible para alterar a seleção no componente que esta AccessibilityImplementation representa. | AccessibilityImplementation | ||
Método de MSAA para retornar a ação de padrão do componente que este AccessibilityImplementation representa ou de um dos seus elementos de filho. | AccessibilityImplementation | ||
Método MSAA para retornar o ID do inteiro sem sinal do elemento filho, se houver, que este filho focaliza no componente. | AccessibilityImplementation | ||
Método de MSAA para retornar o nome do componente que este AccessibilityImplementation representa ou para um dos seus elementos de filho. | AccessibilityImplementation | ||
Método MSAA para retornar a função do sistema para o componente que esta AccessibilityImplementation representa ou um do seus elementos filho. | AccessibilityImplementation | ||
Método MSAA para retornar uma matriz que contém os IDs de todos os elementos filho que foram selecionados. | AccessibilityImplementation | ||
O método de IAccessible para retornar a estatal em tempo de execução atual do componente que este AccessibilityImplementation representa ou de um dos seus elementos de filho. | AccessibilityImplementation | ||
Método de MSAA para retornar o valor em tempo de execução do componente que este AccessibilityImplementation representa ou de um dos seus elementos de filho. | AccessibilityImplementation | ||
AccessibilityImplementation | |||
AccessibilityImplementation | |||
Retorna uma matriz que contém as IDs dos inteiros sem sinal de todos os elementos filho na AccessibilityImplementation. | AccessibilityImplementation | ||
[estático]
Method for supporting Form Accessibility. | AccImpl | ||
Indica se um objeto tem uma propriedade especificada definida. | Object | ||
[estático]
Returns true if an ancestor of the component has enabled set to false. | AccImpl | ||
retorna verdadeiro ou falso para indicar se um objeto de texto que especifica uma caixa delimitadora por um x, y, largura, e altura deve considerar-se um rótulo do componente que este AccessibilityImplementation representa. | AccessibilityImplementation | ||
Indica se uma ocorrência da classe Object está na cadeia de protótipos do objeto especificado como o parâmetro. | Object | ||
Indica se a propriedade especificada existe e é enumerável. | Object | ||
Define a disponibilidade de uma propriedade dinâmica para operações de repetição. | Object | ||
Retorna a representação da string deste objeto, formatado segundo as convenções específicas para a localidade. | Object | ||
Retorna a representação de string do objeto especificado. | Object | ||
Retorna o valor primitivo do objeto especificado. | Object |
Método | Definido por | ||
---|---|---|---|
Generic event handler. | AccImpl | ||
Returns the name of the accessible component. | AccImpl | ||
Utility method to determine state of the accessible component. | AccImpl |
eventsToHandle | propriedade |
eventsToHandle:Array
[somente leitura] Versão da linguagem: | ActionScript 3.0 |
Versão de produto: | Flex 3 |
Versões de runtime: | Flash Player 9, AIR 1.1 |
All subclasses must override this function by returning an array of strings of the events to listen for.
Implementação
protected function get eventsToHandle():Array
master | propriedade |
protected var master:UIComponent
Versão da linguagem: | ActionScript 3.0 |
Versão de produto: | Flex 3 |
Versões de runtime: | Flash Player 9, AIR 1.1 |
A reference to the UIComponent instance that this AccImpl instance is making accessible.
role | propriedade |
protected var role:uint
Versão da linguagem: | ActionScript 3.0 |
Versão de produto: | Flex 3 |
Versões de runtime: | Flash Player 9, AIR 1.1 |
Accessibility role of the component being made accessible.
AccImpl | () | Construtor |
public function AccImpl(master:UIComponent)
Versão da linguagem: | ActionScript 3.0 |
Versão de produto: | Flex 3 |
Versões de runtime: | Flash Player 9, AIR 1.1 |
Constructor.
Parâmetrosmaster:UIComponent — The UIComponent instance that this AccImpl instance
is making accessible.
|
eventHandler | () | método |
getFormName | () | método |
public static function getFormName(component:UIComponent):String
Versão da linguagem: | ActionScript 3.0 |
Versão de produto: | Flex 3 |
Versões de runtime: | Flash Player 9, AIR 1.1 |
Method for supporting Form Accessibility. Called from get_accName() in this AccImpl class. Also called from the UIComponentAccProps constructor.
Parâmetros
component:UIComponent |
String |
getName | () | método |
protected function getName(childID:uint):String
Versão da linguagem: | ActionScript 3.0 |
Versão de produto: | Flex 3 |
Versões de runtime: | Flash Player 9, AIR 1.1 |
Returns the name of the accessible component. All subclasses must implement this instead of implementing get_accName().
Parâmetros
childID:uint |
String |
getState | () | método |
isAncestorDisabled | () | método |
public static function isAncestorDisabled(component:UIComponent):Boolean
Returns true if an ancestor of the component has enabled set to false. The given component itself is not checked.
Parâmetros
component:UIComponent — The UIComponent to check for a disabled ancestor.
|
Boolean — true if the component has a disabled ancestor.
|
Wed Jun 13 2018, 11:10 AM Z