oggetto immagine con actionscript

programming - scritto da Andrea - il 07/01/2007

Nei miei progetti flash capita spesso di dover caricare immagini in maniera asincrona e facendo uso di effetti di fading o tendina o altro. Sfruttando le caratteristiche di un linguaggio ad oggetti come Actionscript 2 diventa un percorso spontaneo il crearsi librerie di oggetti quali appunto l'oggetto immagine. Ecco una mia versione semplificata ed estendibile.

Queste prime righe servono a dichiarare la classe "myImage" che ho scelto di memorizzare nel percorso com/images.

 class com.images.myImage extends MovieClip{
         static var symbolName:String = "__Packages.com.images.myImage";
         static var symbolOwner:Function = myImage;

qui si dichiarano le variabile dell'oggetto. La stringa image_name è pubblica e serve a contenere il percorso dell'immagine sul server. Il resto verrà chiaro dopo.

 private var image:MovieClip
 public var image_name:String;
 private var loader:MovieClipLoader
 private var handler:Object;

creo un Movieclip vuoto che conterrà l'immagine

 public function myImage ()
 {
    this.createEmptyMovieClip("image", this.getNextHighestDepth() );

questo oggetto avraà i metodi per gestire le fasi del caricamento questo oggetto serve ad assegnare la gestione del caricamento di un MovieClip

 loader = new MovieClipLoader()
 handler = new Object();

questa è la fase iniziale del caricamento dal server remoto qui si potrebbe mostrare una piccola animazione di loading

 handler.onLoadStart = function (_mc:MovieClip) { }

questa fase calcola il progressivo avanzamento del caricamento

 handler.onLoadProgress = function (_mc:MovieClip, loaded:Number, total:Number) { }

qui il caricamento è finito. Parte quindi un fading del movieclip

 handler.onLoadProgress = function (_mc:MovieClip, loaded:Number, total:Number) { }

La fase seguente è fondamentale perchè permette di assegnare l'oggetto che gestisce i metodi di caricamento

 loader.addListener(handler)
 loader.loadClip(image_name, this.image );

Per chiudere l'oggetto immagine e renderlo visibile e disponibile aggiungendolo alla libreria di oggetti flash si utilizza questo codice:

    static var symbolLinked = Object.registerClass(symbolName, symbolOwner);
 }

A questo punto diventa banale l'utilizzo della classe con solo due righe di codice:

 import com.images.myImage
 _root.attachMovie(myImage.symbolName, "intro_image", _root.getNextHighestDepth(), { image_name:"immagine.gif" } );

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