Event mechanism in the basics of ActionScript 3.0

In this case, we will summarize the event mechanism in the event 3.0. Here we will only talk about the method 3 in the Custom class to send events, because it is commonly used in the design mode. For example, MVC.

There are two main types of custom events: Event and EventDispatcher ). The custom sending event we discuss is how to enable an object to send events.

Method 1: Inherit the EventDispatcher class

Package {import flash. display. sprite; import flash. events. event; import flash. events. eventDispatcher ;/***... * @ author oak hut */public class estends extends Sprite {function estends () {// first var dispatcher: extendsDispatcher = new extendsDispatcher (); dispatcher. addEventListener (extendsDispatcher. ACTION, actionH); dispatcher. doSome (); // var dispatcher1: EventDispatcher = new EventDispatcher (); events ("secDispatcher", actionH); dispatcher1.dispatchEvent (new Event ("secDispatcher ")); // or dispatcher. addEventListener ("thurdDispatcher", actionH); dispatcher. dispatchEvent (new Event ("thurdDispatcher");} private function actionH (e: Event): void {trace (e) ;}} import flash. events. event; import flash. events. eventDispatcher; class extendsDispatcher extends EventDispatcher {public static var ACTION: String = "action"; public function doSome (): void {dispatchEvent (new Event (extendsDispatcher. ACTION ));}}

As long as you inherit the EventDispatcher class, you can directly use the EventDispatcher class method to send events, which is convenient and simple.

Method 2: Composite EventDispatcher object

Package {/***... * @ author oak hut */import flash. display. sprite; import flash. events. event; public class compont extends Sprite {public function compont () {var dis: compont1 = new compont1 (); dis. getEventDispatch (). addEventListener (compont1.ACTION, show); dis. doSome ();} private function show (e: Event): void {trace (e) ;}} import flash. events. event; import flash. events. eventDispatcher; class compont1 {private var _ dispatcher: EventDispatcher; public static var ACTION: String = "action"; public function compont1 () {_ dispatcher = new EventDispatcher ();} public function getEventDispatch (): EventDispatcher {return _ dispatcher;} public function doSome (): void {_ dispatcher. dispatchEvent (new Event (compont1.ACTION ));}}

The so-called combination is actually to use EventDispatcher to send events, because EventDispatcher itself is an event sending class. Generally, it is easier to use EventDispatcher to send events.

Method 3: implement the IEventDispatcher Interface

Package {import flash. display. sprite; import flash. events. event ;/***... * @ author oak hut */public class implement extends Sprite {public function implement () {var impObj: implete = new implete (); impObj. addEventListener (implete. ACTION, actionH); impObj. dispatchEvent (new Event (implete. ACTION);} private function actionH (e: Event): void {trace (e) ;}} import flash. events. event; import flash. events. eventDispatcher; import flash. events. IEventDispatcher; class implete implements IEventDispatcher {public var _ dispatcher: EventDispatcher; public static const ACTION: String = "action"; public function implete () {_ dispatcher = new EventDispatcher ();} // implement five methods: public function addEventListener (type: String, listener: Function, useCapture: Boolean = false, priority: int = 0, useWeakReference: Boolean = true ): void {_ dispatcher. addEventListener (type, listener, useCapture, priority, useWeakReference);} public function dispatchEvent (evt: Event): Boolean {return _ dispatcher. dispatchEvent (evt);} public function hasEventListener (type: String): Boolean {return _ dispatcher. hasEventListener (type);} public function removeEventListener (type: String, listener: Function, useCapture: Boolean = false): void {_ dispatcher. removeEventListener (type, listener, useCapture);} public function willTrigger (type: String): Boolean {return _ dispatcher. willTrigger (type );}}

When the class itself needs to inherit other classes and cannot inherit the EventDispatcher class, it also hopes that this class can become a simple event sending class, and you can add some methods in it by yourself, at this time, it is more appropriate to inherit the IEventDispatcher interface, but the process is more difficult to write. Five methods to implement the IEventDispatcher interface are required.

 

 

References:

The road to the temple of flash ActionScript 3.0

Turn: http://www.cnblogs.com/babyzone2004/archive/2010/10/03/1841509.html

 

In this case, we will summarize the event mechanism in the event 3.0. Here we will only talk about the method 3 in the Custom class to send events, because it is commonly used in the design mode. For example, MVC.

There are two main types of custom events: Event and EventDispatcher ). The custom sending event we discuss is how to enable an object to send events.

Method 1: Inherit the EventDispatcher class

Package {import flash. display. sprite; import flash. events. event; import flash. events. eventDispatcher ;/***... * @ author oak hut */public class estends extends Sprite {function estends () {// first var dispatcher: extendsDispatcher = new extendsDispatcher (); dispatcher. addEventListener (extendsDispatcher. ACTION, actionH); dispatcher. doSome (); // var dispatcher1: EventDispatcher = new EventDispatcher (); events ("secDispatcher", actionH); dispatcher1.dispatchEvent (new Event ("secDispatcher ")); // or dispatcher. addEventListener ("thurdDispatcher", actionH); dispatcher. dispatchEvent (new Event ("thurdDispatcher");} private function actionH (e: Event): void {trace (e) ;}} import flash. events. event; import flash. events. eventDispatcher; class extendsDispatcher extends EventDispatcher {public static var ACTION: String = "action"; public function doSome (): void {dispatchEvent (new Event (extendsDispatcher. ACTION ));}}

As long as you inherit the EventDispatcher class, you can directly use the EventDispatcher class method to send events, which is convenient and simple.

Method 2: Composite EventDispatcher object

Package {/***... * @ author oak hut */import flash. display. sprite; import flash. events. event; public class compont extends Sprite {public function compont () {var dis: compont1 = new compont1 (); dis. getEventDispatch (). addEventListener (compont1.ACTION, show); dis. doSome ();} private function show (e: Event): void {trace (e) ;}} import flash. events. event; import flash. events. eventDispatcher; class compont1 {private var _ dispatcher: EventDispatcher; public static var ACTION: String = "action"; public function compont1 () {_ dispatcher = new EventDispatcher ();} public function getEventDispatch (): EventDispatcher {return _ dispatcher;} public function doSome (): void {_ dispatcher. dispatchEvent (new Event (compont1.ACTION ));}}

The so-called combination is actually to use EventDispatcher to send events, because EventDispatcher itself is an event sending class. Generally, it is easier to use EventDispatcher to send events.

Method 3: implement the IEventDispatcher Interface

Package {import flash. display. sprite; import flash. events. event ;/***... * @ author oak hut */public class implement extends Sprite {public function implement () {var impObj: implete = new implete (); impObj. addEventListener (implete. ACTION, actionH); impObj. dispatchEvent (new Event (implete. ACTION);} private function actionH (e: Event): void {trace (e) ;}} import flash. events. event; import flash. events. eventDispatcher; import flash. events. IEventDispatcher; class implete implements IEventDispatcher {public var _ dispatcher: EventDispatcher; public static const ACTION: String = "action"; public function implete () {_ dispatcher = new EventDispatcher ();} // implement five methods: public function addEventListener (type: String, listener: Function, useCapture: Boolean = false, priority: int = 0, useWeakReference: Boolean = true ): void {_ dispatcher. addEventListener (type, listener, useCapture, priority, useWeakReference);} public function dispatchEvent (evt: Event): Boolean {return _ dispatcher. dispatchEvent (evt);} public function hasEventListener (type: String): Boolean {return _ dispatcher. hasEventListener (type);} public function removeEventListener (type: String, listener: Function, useCapture: Boolean = false): void {_ dispatcher. removeEventListener (type, listener, useCapture);} public function willTrigger (type: String): Boolean {return _ dispatcher. willTrigger (type );}}

When the class itself needs to inherit other classes and cannot inherit the EventDispatcher class, it also hopes that this class can become a simple event sending class, and you can add some methods in it by yourself, at this time, it is more appropriate to inherit the IEventDispatcher interface, but the process is more difficult to write. Five methods to implement the IEventDispatcher interface are required.

 

 

References:

The road to the temple of flash ActionScript 3.0

Turn: http://www.cnblogs.com/babyzone2004/archive/2010/10/03/1841509.html