DataItem

Package	spark.utils
Class	public dynamic class DataItem
Inheritance	DataItem ObjectProxy Proxy

Language Version:

ActionScript 3.0

Product Version:

Flex 4.5

Runtime Versions:

Flash Player 10, AIR 2.5

The DataItem class represents a dynamic object with bindable properties. That means the Flex data binding mechanism recognizes when properties of a DataItem change at runtime. For example, a Spark DataGrid item renderer relies on data binding to a property of the items in the control's data provider. Because of data binding, when the property changes at runtime, the item renderer updates automatically.

This class is intended to be used in MXML to define object literals whose properties must be bindable. It's typically used to define List or DataGrid data provider items within an MXML file for small applications or examples with item renderers that bind to their data. Non-trival applications, or any application for which performance is a concern, should define a [Bindable] class with a fixed set of strongly typed properties and use that class to define data provider items.

Public Properties

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	Property		Defined By
		uid : String The unique identifier for this object.	ObjectProxy

Protected Properties

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	Property		Defined By
		dispatcher : EventDispatcher A reference to the EventDispatcher for this proxy.	ObjectProxy
		notifiers : Object A hashmap of property change notifiers that this proxy is listening for changes from; the key of the map is the property name.	ObjectProxy
		object : Object [read-only] The object being proxied.	ObjectProxy
		propertyList : Array Contains a list of all of the property names for the proxied object.	ObjectProxy
		proxyClass : Class Indicates what kind of proxy to create when proxying complex properties.	ObjectProxy
		type : QName The qualified type name associated with this object.	ObjectProxy

Public Methods

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	Method		Defined By
		DataItem() Constructor	DataItem
		addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void Registers an event listener object so that the listener receives notification of an event.	ObjectProxy
		dispatchEvent(event:Event):Boolean Dispatches an event into the event flow.	ObjectProxy
		hasEventListener(type:String):Boolean Checks whether there are any event listeners registered for a specific type of event.	ObjectProxy
		propertyChangeHandler(event:PropertyChangeEvent):void Called when a complex property is updated.	ObjectProxy
		readExternal(input:IDataInput):void Since Flex only uses ObjectProxy to wrap anonymous objects, the server flex.messaging.io.ObjectProxy instance serializes itself as a Map that will be returned as a plain ActionScript object.	ObjectProxy
		removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void Removes an event listener.	ObjectProxy
		willTrigger(type:String):Boolean Checks whether an event listener is registered with this object or any of its ancestors for the specified event type.	ObjectProxy
		writeExternal(output:IDataOutput):void Since Flex only serializes the inner ActionScript object that it wraps, the server flex.messaging.io.ObjectProxy populates itself with this anonymous object's contents and appears to the user as a Map.	ObjectProxy

Protected Methods

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	Method		Defined By
		setupPropertyList():void This method creates an array of all of the property names for the proxied object.	ObjectProxy

Constructor Detail

()

Constructor

public function DataItem()