| Package | mx.core |
| Class | public class UIComponentDescriptor |
| Inheritance | UIComponentDescriptor  ComponentDescriptor Object |
| Language Version : | ActionScript 3.0 |
| Product Version : | Flex 3 |
| Runtime Versions : | Flash Player 9, AIR 1.1 |
Most of the tags in an MXML file describe a tree of UIComponent objects.
For example, the <mx:Application> tag represents a
UIComponent object, and its child containers and controls are all
UIComponent objects.
The MXML compiler compiles each of these MXML tags into a UIComponentDescriptor instance. To be precise, the MXML compiler autogenerates an ActionScript data structure which is a tree of UIComponentDescriptor objects.
At runtime, the createComponentsFromDescriptors() method
of the Container class uses the information in the UIComponentDescriptor
objects in the container's childDescriptors array to create
the actual UIComponent objects that are the container's children,
plus deeper descendants as well.
Depending on the value of the container's creationPolicy,
property, the descendants might be created at application startup,
when some part of the component is about to become visible,
or when the application developer manually calls
the createComponentsFromDescriptors() method.
You do not typically create UIComponentDescriptor instances yourself;
you can access the ones that the MXML compiler autogenerates via the
childDescriptors array of the Container class.
See also
| Property | Defined By | ||
|---|---|---|---|
 | document : Object
A reference to the document Object in which the component
is to be created. | ComponentDescriptor | |
| effects : Array
An Array containing the effects for the component, as specified in MXML. | UIComponentDescriptor | ||
| events : Object
An Object containing name/value pairs for the component's
event handlers, as specified in MXML. | ComponentDescriptor | |
| id : String
The identifier for the component, as specified in MXML. | ComponentDescriptor | |
| properties : Object [read-only]
An Object containing name/value pairs for the component's properties,
as specified in MXML. | ComponentDescriptor | |
| propertiesFactory : Function
A Function that returns an Object containing name/value pairs
for the component's properties, as specified in MXML. | ComponentDescriptor | |
| stylesFactory : Function
A Function that constructs an Object containing name/value pairs
for the instance styles for the component, as specified in MXML. | UIComponentDescriptor | ||
| type : Class
The Class of the component, as specified in MXML. | ComponentDescriptor | |
| Method | Defined By | ||
|---|---|---|---|
UIComponentDescriptor(descriptorProperties:Object)
Constructor. | UIComponentDescriptor | ||
| invalidateProperties():void
Invalidates the cached properties property. | ComponentDescriptor | |
| toString():String
Returns the string "ComponentDescriptor_" plus the value of the
id property. | ComponentDescriptor | |
| effects | property |
Hide Inherited Public Properties
Show Inherited Public Propertiespublic var effects:Array| Language Version : | ActionScript 3.0 |
| Product Version : | Flex 3 |
| Runtime Versions : | Flash Player 9, AIR 1.1 |
An Array containing the effects for the component, as specified in MXML.
For example, if you write the following code:
<mx:TextInput showEffect="Fade" hideEffect="Fade"/>
The descriptor's effects property is the Array
[ "showEffect", "hideEffect" ].
The effectsproperty is null
if no MXML effects were specified for the component.
Note that the values of the effect attributes are not specified
in this property.
Instead, effects are treated like styles and therefore are include
in the stylesFactory property.
The effect Array simply keeps track of which styles
in the stylesFactory are actually effects.
This property is used by the Container method
createComponentsFromDescriptors()
to register the effects with the EffectManager.
| stylesFactory | property |
public var stylesFactory:Function| Language Version : | ActionScript 3.0 |
| Product Version : | Flex 3 |
| Runtime Versions : | Flash Player 9, AIR 1.1 |
A Function that constructs an Object containing name/value pairs for the instance styles for the component, as specified in MXML.
For example, if you write the following code:
<mx:TextInput borderColor="0x888888" color="0xDDDDDD"/>
Then the descriptors' stylesFactory property
is the Function:
function():void { this.borderColor = 0x888888; this.color = 0xDDDDDD };
The stylesFactory property is null
if no MXML styles were specified for the component instance.
| UIComponentDescriptor | () | Constructor |
public function UIComponentDescriptor(descriptorProperties:Object)| Language Version : | ActionScript 3.0 |
| Product Version : | Flex 3 |
| Runtime Versions : | Flash Player 9, AIR 1.1 |
Constructor.
ParametersdescriptorProperties:Object — An Object containing name/value pairs
for the properties of the UIComponentDescriptor object, such as its
type, id, propertiesFactory,
events, stylesFactory,
and effects.
|