问Flex 4 fileReference选定图像文件尺寸(宽度和高度)

EN

<fx:Script>
    <![CDATA[

        import mx.events.FlexEvent;     

        private function browseImage(event:MouseEvent):void {
            var arr:Array = [];
            arr.push(new FileFilter("Images", ".gif;*.jpeg;*.jpg;*.png"));
            imageFileReference.browse(arr);         
        }

        private function imageSelect(evt:Event):void {
            imageFileReference.load();
        }

        private function imageComplete(evt:Event):void {
            image.source = smallImageFileReference.data;
            image.addEventListener(FlexEvent.UPDATE_COMPLETE, getImageSize);                
        }

        private function getImageSize(evt:FlexEvent):void {
            image.removeEventListener(FlexEvent.UPDATE_COMPLETE, getImageSize);         
            imageWidth.text = image.sourceWidth + "px";
            imageHeight.text = image.sourceHeight + "px";
        }
    ]]>

</fx:Script>

<fx:Declarations>
    <net:FileReference id="imageFileReference" 
        select="imageSelect(event)" 
        complete="imageComplete(event)"/>
</fx:Declarations>

<s:VGroup width="100%" height="100%">

    <s:HGroup width="100%" verticalAlign="middle">
        <s:Label fontWeight="bold" text="Width:" />
        <mx:Text id="imageWidth" />
    </s:HGroup> 

    <s:HGroup width="100%" verticalAlign="middle">
        <s:Label fontWeight="bold" text="Height:" />
        <mx:Text id="imageHeight" />
    </s:HGroup>

    <s:Image id="image" maxHeight="200" maxWidth="200" />
    <s:Button label="Browse for Image" click="browseImage(event)" />

</s:VGroup>