Image组件 设置 URLRequestHeader

不知道为什么Image 组件不能设置类似:var header:URLRequestHeader = new URLRequestHeader("Cache-Control", "no-cache");

 

于是:

 

package com.palace.component{import com.palace.manager.AssetsManager;import com.palace.util.MyTimerUtil;import flash.display.Loader;import flash.display.MovieClip;import flash.events.Event;import flash.events.IOErrorEvent;import flash.events.ProgressEvent;import flash.net.URLRequest;import flash.net.URLRequestHeader;import flash.net.URLRequestMethod;import mx.core.UIComponent;public class CommonImage extends UIComponent implements IPalaceToolTipInterface{public function CommonImage(){super()}public var maintainAspectRatio:Boolean = false;private var ld:Loader;private var circleMovie:MovieClip;public function loadImg(url:String,noCache:Boolean=false):void{if(ld == null){ld = new Loader();ld.contentLoaderInfo.addEventListener(Event.COMPLETE , loadComplete);ld.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS , progressHandle);ld.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR , ioErrorHandle);this.addChild(ld);}var req:URLRequest = new URLRequest(url);if(noCache){req.data = MyTimerUtil.getCurrentTime();req.method = URLRequestMethod.POST;var header:URLRequestHeader = new URLRequestHeader("Cache-Control", "no-cache");req.requestHeaders.push(header);}ld.load(req);}public function unloadAndStop():void{if(ld!=null){ld.unload();}clear()}private function loadComplete(e:Event):void{clear()check_maintainAspectRatio()}override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void{super.updateDisplayList(unscaledWidth, unscaledHeight);check_maintainAspectRatio();}private function check_maintainAspectRatio():void{if(maintainAspectRatio && ld != null && ld.contentLoaderInfo != null){// Scale the content to the size of the SWFLoader, preserving aspect ratio.var interiorWidth:Number = unscaledWidth;var interiorHeight:Number = unscaledHeight;var contentWidth:Number = ld.contentLoaderInfo.width;var contentHeight:Number = ld.contentLoaderInfo.heightvar x:Number = 0;var y:Number = 0;// bug 84294 a swf may still not have size at this pointvar newXScale:Number = contentWidth == 0 ?1 :interiorWidth / contentWidth;var newYScale:Number = contentHeight == 0 ?1 :interiorHeight / contentHeight;var scale:Number;if (newXScale > newYScale){x = Math.floor((interiorWidth - contentWidth * newYScale) * .5)scale = newYScale;}else{y = Math.floor((interiorHeight - contentHeight * newXScale) * .5);scale = newXScale;}// Scale by the same amount in both directions.ld.scaleX = scale;ld.scaleY = scale;}}private function progressHandle(e:ProgressEvent):void{if(circleMovie == null){circleMovie = AssetsManager.getDisplayObject("loadingCircle") as MovieClip;this.addChild(circleMovie);}else{if(this.width <= 0){circleMovie.x = 5}else{circleMovie.x = this.width/2- 30/2;}if(this.height <= 0){circleMovie.y = 5;}else{circleMovie.y = this.height/2-30/2}}}private function ioErrorHandle(e:IOErrorEvent):void{clear()}private function clear():void{if(circleMovie!=null&&this.contains(circleMovie)) {this.removeChild(circleMovie);}if(ld != null){ld.contentLoaderInfo.removeEventListener(Event.COMPLETE , loadComplete);ld.contentLoaderInfo.removeEventListener(ProgressEvent.PROGRESS , progressHandle);ld.contentLoaderInfo.removeEventListener(IOErrorEvent.IO_ERROR , ioErrorHandle);}}private var _toolTipType:Numberpublic function get toolTipType():Number{return _toolTipType;}public function set toolTipType(value:Number):void{_toolTipType = value;}private var _tipWidth:Number;public function get tipWidth():Number{return _tipWidth;}public function set tipWidth(value:Number):void{_tipWidth = value;}private var _tipHeight:Number;public function get tipHeight():Number{return _tipHeight;}public function set tipHeight(value:Number):void{_tipHeight = value;}}}