MACROMEDIA FLEX-GETTING STARTED WITH FLEX Manuale Utente Scaricare il pdf (Pagina 126)

paddingTop="0"

creationComplete="flickReq.send();" backgroundAlpha="0"

backgroundColor="white"

backgroundGradientColors="[0xFFFFFF,0xFFFFFF]">

<mx:Script>

<![CDATA[

import mx.rpc.events.ResultEvent;

import mx.collections.ArrayCollection;

private var images:Array = [];

private var currentImage:int = 0;

private function onFetchResult( event:ResultEvent ) : void {

var items:ArrayCollection = event.result.rss.channel.item as

ArrayCollection;

for each ( var item:Object in items )

images.push( item.thumbnail.url.toString() );

flickImg.source = images[currentImage];

var t:Timer = new Timer( 2000 );

t.addEventListener( TimerEvent.TIMER, onTimer );

t.start();

}

private function onTimer( event:Event ) : void {

currentImage += 1;

if ( currentImage >= images.length )

currentImage = 0;

flickImg.source = images[currentImage];

}

]]>

</mx:Script>

<mx:HTTPService id="flickReq"

url="http://api.flickr.com/services/feeds

/photos_public.gne?format=rss_200_enc"

result="onFetchResult(event)" />

<mx:Image width="100" height="100" id="flickImg">

<mx:filters><mx:DropShadowFilter /></mx:filters>

</mx:Image>

</mx:Application>

At the top of the application I define two methods. The first is

onFetchResult, which handles the response from Flickr and

sets up the list of images. The onFetchResult method also sets

up a timer that calls back to the onTimer method every 2,000

milliseconds (every two seconds) to change the source of the

image. The bottom portion of the example defines the HTTPSer

vice to connect to, and the image object to use to display the

Flickr image.

110 | Chapter 8: Flex for Widgets

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MACROMEDIA FLEX-GETTING STARTED WITH FLEX Manuale Utente Pagina 126

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