SetEventHandler

Pacchetto	mx.states
Classe	public class SetEventHandler
Ereditarietà	SetEventHandler OverrideBase OnDemandEventDispatcher Object

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

The SetEventHandler class specifies an event handler that is active only during a particular view state. For example, you might define a Button control that uses one event handler in the base view state, but uses a different event handler when you change view state.

You use this class in the overrides property of the State class.

Sintassi MXML expanded

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The <mx:SetEventHanlder> tag has the following attributes:

  <mx:SetEventHandler
  Properties
  name="null"
  handlerFunction="null"
  target="null"
  
  Events
  handler=No default
  />

Elementi API correlati

mx.states.State
mx.states.SetProperty
mx.states.SetStyle

Proprietà pubbliche

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	Proprietà		Definito da
		constructor : Object Un riferimento all'oggetto classe o alla funzione di costruzione per una determinata istanza di oggetto.	Object
		handlerFunction : Function The handler function for the event.	SetEventHandler
		name : String The name of the event whose handler is being set.	SetEventHandler
		originalHandlerFunction : Function The handler function to remove prior to applying our override.	SetEventHandler
		target : Object The component that dispatches the event.	SetEventHandler

Metodi pubblici

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	Metodo		Definito da
		SetEventHandler(target:EventDispatcher = null, name:String = null) Constructor.	SetEventHandler
		addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void Registers an event listener object with an EventDispatcher object so that the listener receives notification of an event.	OnDemandEventDispatcher
		apply(parent:UIComponent):void [override] Applies the override.	SetEventHandler
		dispatchEvent(event:Event):Boolean Dispatches an event into the event flow.	OnDemandEventDispatcher
		hasEventListener(type:String):Boolean Checks whether the EventDispatcher object has any listeners registered for a specific type of event.	OnDemandEventDispatcher
		hasOwnProperty(name:String):Boolean Indica se per un oggetto è definita una proprietà specifica.	Object
		initialize():void IOverride interface method; this class implements it as an empty method.	OverrideBase
		isPrototypeOf(theClass:Object):Boolean Indica se un'istanza della classe Object si trova nella catena di prototipi dell'oggetto specificato come parametro.	Object
		propertyIsEnumerable(name:String):Boolean Indica se la proprietà specificata esiste ed è enumerabile.	Object
		remove(parent:UIComponent):void [override] Removes the override.	SetEventHandler
		removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void Removes a listener from the EventDispatcher object.	OnDemandEventDispatcher
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Imposta la disponibilità di una proprietà dinamica per le operazioni cicliche.	Object
		toLocaleString():String Restituisce la rappresentazione in formato stringa di questo oggetto, formattato in base alle convenzioni specifiche per le versioni localizzate.	Object
		toString():String Restituisce la rappresentazione in formato stringa dell'oggetto specificato.	Object
		valueOf():Object Restituisce il valore di base dell'oggetto specificato.	Object
		willTrigger(type:String):Boolean Checks whether an event listener is registered with this EventDispatcher object or any of its ancestors for the specified event type.	OnDemandEventDispatcher

Eventi

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	Evento		Riepilogo	Definito da
		handler	The event handler function to execute in response to the event that is specified by the name property.	SetEventHandler

Descrizione delle proprietà

handlerFunction

proprietà

public var handlerFunction:Function

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

The handler function for the event. This property is intended for developers who use ActionScript to create and access view states. In MXML, you can use the equivalent handler event attribute; do not use both in a single MXML tag.

Il valore predefinito è null.

name

proprietà

public var name:String

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

The name of the event whose handler is being set. You must set this property, either in the SetEventHandler constructor or by setting the property value directly.

originalHandlerFunction

proprietà

public var originalHandlerFunction:Function

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 4.5

Versioni runtime:

Flash Player 9, AIR 1.1

The handler function to remove prior to applying our override.

Il valore predefinito è null.

target

proprietà

public var target:Object

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

The component that dispatches the event. If the property value is null, Flex uses the immediate parent of the <mx:states> tag.

Il valore predefinito è null.

Descrizione della funzione di costruzione

()

Funzione di costruzione

public function SetEventHandler(target:EventDispatcher = null, name:String = null)

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Constructor.

Parametri

	`target:EventDispatcher` (default = `null`) — The object that dispatches the event to be handled. By default, Flex uses the immediate parent of the State object.

	`name:String` (default = `null`) — The event type for which to set the handler.

Descrizione dei metodi

apply

()

metodo

override public function apply(parent:UIComponent):void

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Applies the override. Flex retains the original value, so that it can restore the value later in the remove() method.

This method is called automatically when the state is entered. It should not be called directly.

Parametri

parent:UIComponent — The parent of the state object containing this override. The override should use this as its target if an explicit target was not specified.

remove

()

metodo

override public function remove(parent:UIComponent):void

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Removes the override. The value remembered in the apply() method is restored.

This method is called automatically when the state is entered. It should not be called directly.

Parametri

parent:UIComponent — The parent of the state object containing this override. The override should use this as its target if an explicit target was not specified.

Descrizione degli eventi

handler

Evento

Tipo di oggetto evento: Object

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

The event handler function to execute in response to the event that is specified by the name property.

Do not specify the handler property and the handlerFunction property in a single <mx:SetEventHandler> tag.

Flex does not dispatch a handler event. You use the handler key word only as an MXML attribte. When you use the handler handler attribute, you can specify a method that takes multiple parameters, not just the Event object; also, you can specify the handler code in-line in the MXML tag.

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SetEventHandler - AS3 Flex

Classi x

handlerFunction

name

originalHandlerFunction

target