Package | spark.accessibility |
Class | public class ButtonBaseAccImpl |
Inheritance | ButtonBaseAccImpl AccImpl AccessibilityImplementation Object |
Subclasses | CheckBoxAccImpl, ToggleButtonAccImpl |
Language Version: | ActionScript 3.0 |
Product Version: | Flex 4 |
Runtime Versions: | Flash Player 10, AIR 1.5 |
Although ToggleButton, CheckBox, and RadioButton have their own accessibility implementation subclasses, Button simply uses the one for ButtonBase. Therefore, the rest of this description refers to the commonly-used Button component rather than the ButtonBase base class.
When a Spark Button 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 Button.
See the mx.accessibility.AccImpl and
flash.accessibility.AccessibilityImplementation classes
for background information about accessibility implementation
classes and MSAA.
Children
A Button has no MSAA children.
Role
The MSAA Role of a Button is ROLE_SYSTEM_PUSHBUTTON.
Name
The MSAA Name of a Button is, by default, the label that it displays.
When wrapped in a FormItem element,
this label will be combined with the FormItem's label.
To override this behavior,
set the Button's accessibilityName
property.
When the Name changes, a Button dispatches the MSAA event EVENT_OBJECT_NAMECHANGE.
Description
The MSAA Description of a Button is, by default, the empty string,
but you can set the Button's accessibilityDescription
property.
State
The MSAA State of a Button 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 Button has focus)
When the State changes, a Button dispatches the MSAA event EVENT_OBJECT_STATECHANGE.
Value
A Button does not have an MSAA Value.
Location
The MSAA Location of a Button is its bounding rectangle.
Default Action
The MSAA DefaultAction of a Button is "Press".
When an MSAA client tells the Button to perform this action, KEY_DOWN and KEY_UP MouseEvents for the SPACE key are generated, to simulate pressing the ButtonBase via the keyboard, if the Button is enabled.
Focus
A Button accepts focus. When it does so, it dispatches the MSAA event EVENT_OBJECT_FOCUS.
Selection
A Button does not support selection in the MSAA sense.
Method | Defined By | ||
---|---|---|---|
ButtonBaseAccImpl(master:UIComponent)
Constructor. | ButtonBaseAccImpl | ||
An IAccessible method that performs the default action associated with the component
that this AccessibilityImplementation represents or of one of its child elements. | AccessibilityImplementation | ||
MSAA method for returning a DisplayObject or Rectangle
specifying the bounding box of a child element in the AccessibilityImplementation. | AccessibilityImplementation | ||
IAccessible method for altering the selection in the component
that this AccessibilityImplementation represents. | AccessibilityImplementation | ||
[static]
Enables accessibility in the Button class. | ButtonBaseAccImpl | ||
MSAA method for returning the default action of the component
that this AccessibilityImplementation represents or of one of its child elements. | AccessibilityImplementation | ||
MSAA method for returning the unsigned integer ID of the child element, if any,
that has child focus within the component. | AccessibilityImplementation | ||
MSAA method for returning the name for the component
that this AccessibilityImplementation represents or for one of its child elements. | AccessibilityImplementation | ||
MSAA method for returning the system role for the component
that this AccessibilityImplementation represents or for one of its child elements. | AccessibilityImplementation | ||
MSAA method for returning an array containing the IDs of all child elements that are selected. | AccessibilityImplementation | ||
IAccessible method for returning the current runtime state of the component that this
AccessibilityImplementation represents or of one of its child elements. | AccessibilityImplementation | ||
MSAA method for returning the runtime value of the component that this
AccessibilityImplementation represents or of one of its child elements. | AccessibilityImplementation | ||
Returns an array containing the unsigned integer IDs of all child elements
in the AccessibilityImplementation. | AccessibilityImplementation | ||
[static]
Method for supporting Form Accessibility. | AccImpl | ||
Indicates whether an object has a specified property defined. | Object | ||
[static]
Method for supporting state Accessibility. | AccImpl | ||
Indicates whether an instance of the Object class is in the prototype chain of the object specified
as the parameter. | Object | ||
Indicates whether the specified property exists and is enumerable. | Object | ||
Sets the availability of a dynamic property for loop operations. | Object | ||
Returns the string representation of this object, formatted according to locale-specific conventions. | Object | ||
Returns the string representation of the specified object. | Object | ||
Returns the primitive value of the specified object. | Object |
ButtonBaseAccImpl | () | Constructor |
public function ButtonBaseAccImpl(master:UIComponent)
Language Version: | ActionScript 3.0 |
Product Version: | Flex 4 |
Runtime Versions: | Flash Player 10, AIR 1.5 |
Constructor.
Parametersmaster:UIComponent — The UIComponent instance that this AccImpl instance
is making accessible.
|
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 Button class.
This method is called by application startup code
that is autogenerated by the MXML compiler.
Afterwards, when instances of Button are initialized,
their accessibilityImplementation
property
will be set to an instance of this class.
Fri Mar 19 2010, 02:45 AM -07:00