Actionscript 3 Entwicklerhandbuch

ACTIONSCRIPT 3.0 ENTWICKLERHANDBUCH
Verwenden von Bitmaps
Das folgende Beispiel veranschaulicht den Unterschied zwischen der synchronen und der asynchronen Dekodierung
eines Bitmapbildes.
package
{
import flash.display.Loader;
import flash.display.Sprite;
import flash.events.Event;
import flash.net.URLRequest;
import flash.system.ImageDecodingPolicy;
import flash.system.LoaderContext;
public class AsyncTest extends Sprite
{
private var loaderContext:LoaderContext;
private var loader:Loader;
private var urlRequest:URLRequest;
public function AsyncTest()
{
//Load the image synchronously
loaderContext = new LoaderContext();
//Default behavior.
loaderContext.imageDecodingPolicy = ImageDecodingPolicy.ON_DEMAND;
loader = new Loader();
loadImageSync();
}
//Load the image asynchronously
loaderContext = new LoaderContext();
loaderContext.imageDecodingPolicy = ImageDecodingPolicy.ON_LOAD;
loader = new Loader();
loadImageASync();
private function loadImageASync():void{
trace("Loading image asynchronously...");
urlRequest = new URLRequest("http://www.adobe.com/myimage.png");
urlRequest.useCache = false;
loader.load(urlRequest, loaderContext);
loader.contentLoaderInfo.addEventListener
(Event.COMPLETE, onAsyncLoadComplete);
Letzte Aktualisierung 27.6.2012
282