Package | spark.accessibility |
Class | public class SliderBaseAccImpl |
Inheritance | SliderBaseAccImpl AccImpl AccessibilityImplementation Object |
Language Version: | ActionScript 3.0 |
Product Version: | Flex 4 |
Runtime Versions: | Flash Player 10, AIR 1.5 |
The Spark HSlider and VSlider components extend SliderBase and use SlideBaseAccImpl as their accessibility implementation class. For convenience, the rest of this description uses the word Slider to mean either HSlider or VSlider, even though there is no Spark class named Slider.
When a Slider 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 Slider.
See the mx.accessibility.AccImpl and
flash.accessibility.AccessibilityImplementation classes
for background information about accessibility implementation
classes and MSAA.
Children
A Slider has 3 MSAA children:
- Clickable area to the left (or bottom) of thumb
- Thumb
- Clickable area to the right (or top) of thumb
Role
The MSAA Role of a Slider is ROLE_SYSTEM_SLIDER.
The Role of each child is:
- ROLE_SYSTEM_PUSHBUTTON
- ROLE_SYSTEM_INDICATOR
- ROLE_SYSTEM_PUSHBUTTON
Name
The MSAA Name of a Slider 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 Slider's accessibilityName
property.
The Name of each child comes from a locale-dependent resource. In the en_US locale, the names are:
- "Page left" for HSlider; "Page up" for VSlider
- "Position"
- "Page right" for HSlider; "Page down" for VSlider
When the Name of the Slider or one of its child parts changes, a Slider dispatches the MSAA event EVENT_OBJECT_NAMECHANGE with the proper childID for the part or 0 for itself.
Description
The MSAA Description of a Slider is, by default, the empty string,
but you can set the Slider's accessibilityDescription
property.
The Description of each child part is the empty string.
State
The MSAA state of a Slider 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 Slider has focus)
The State of each child part is:
- STATE_SYSTEM_UNAVAILABLE (when enabled is false)
When the State of the Slider or one of its child parts changes, a Slider dispatches the MSAA event EVENT_OBJECT_STATECHANGE with the proper childID for the part or 0 for itself.
Value
The MSAA Value of a Slider is a number between 0 and 100.
The child parts do not have MSAA values.
When the Value of the Slider changes, a Slider dispatches the MSAA event EVENT_OBJECT_VALUECHANGE.
Location
The MSAA Location of a Slider or its thumb is its bounding rectangle. For the two children representing the trackbar regions adjacent to the thumb, the slider's bounding rectangle is returned.
Default Action
A Slider and its child parts have no default action.
Focus
A Slider accepts focus. When it does so, it dispatches the MSAA event EVENT_OBJECT_FOCUS.
Selection
A Slider does not support selection in the MSAA sense.
Method | Defined By | ||
---|---|---|---|
SliderBaseAccImpl(master:UIComponent)
Constructor. | SliderBaseAccImpl | ||
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 SliderBase class. | SliderBaseAccImpl | ||
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 |
SliderBaseAccImpl | () | Constructor |
public function SliderBaseAccImpl(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 SliderBase class.
This method is called by application startup code
that is autogenerated by the MXML compiler.
Afterwards, when instances of sliders are initialized,
their accessibilityImplementation
property
will be set to an instance of this class.
Fri Mar 19 2010, 02:45 AM -07:00