FLEX 4 動態(tài)加載背景圖片 BackgroundImage

Sky-Cool 2012-07-11

展開全文

最近研究FLEX 4動態(tài)加載背景圖片，發(fā)現(xiàn)沒有效率比較好的方法，貼貼自己搜集、研究的認為效率好點的代碼~~~

<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx" creationComplete="init()" width="320" height="240">
<fx:Script>
<![CDATA[
import mx.core.UIComponent;
import spark.events.IndexChangeEvent;
private var skinsLoader:Loader;
private var defaultSkinSrc:String = '1.png';
private var skinUi:UIComponent = null;
private function init():void
{
imgLoader(defaultSkinSrc);
}
protected function dropdownlist1_changeHandler(event:IndexChangeEvent):void
{
imgLoader(DropDownList(event.currentTarget).selectedItem);
}
public function imgLoader(imgPath:String):void
{
skinsLoader = new Loader;
skinsLoader.contentLoaderInfo.addEventListener(Event.COMPLETE,imgLoaderComplete);
skinsLoader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR,imgIOErrorHandler);
var urlRequest:URLRequest = new URLRequest();
urlRequest.url = "images/"+imgPath;
skinsLoader.load(urlRequest);
}
private function imgLoaderComplete(event:Event):void
{
var bitmap:Bitmap = event.target.content as Bitmap;
bitmap.width = stage.stageWidth, bitmap.height = stage.stageHeight;
if(skinUi)
{
removeElement(skinUi);
skinUi = null;
}
skinUi = new UIComponent();
skinUi.addChild(bitmap);
addElementAt(skinUi,0);
//-------------------
skinsLoader.contentLoaderInfo.removeEventListener (Event.COMPLETE , imgLoaderComplete);
skinsLoader.contentLoaderInfo.removeEventListener (IOErrorEvent.IO_ERROR , imgIOErrorHandler);
skinsLoader = null;
}
private function imgIOErrorHandler(event:IOErrorEvent):void
{
trace(event.text);
}
]]>
</fx:Script>
<fx:Declarations>
</fx:Declarations>
<s:Label text="選擇皮膚:" fontSize="16" x="50" y="104" height="21"/>
<s:DropDownList x="137" y="103" change="dropdownlist1_changeHandler(event)" >
<s:dataProvider>
<s:ArrayList source="[1.png,2.png,3.png,4.png,5.png,6.png]" />
</s:dataProvider>
</s:DropDownList>
</s:WindowedApplication>