package {
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.text.TextField;
    import flash.display.StageAlign;
    import flash.display.StageScaleMode;

    public class AutoSizeExample extends Sprite
    {
        private var txt:TextField;
        public function AutoSizeExample()
        {
            stage.align = StageAlign.TOP_LEFT;
            stage.scaleMode = StageScaleMode.NO_SCALE;

            txt = new TextField();
            txt.multiline = true;
            txt.wordWrap = true;
            txt.text = "info\n";
            addChild(txt);

            if (stage.stageWidth>0 && stage.stageHeight>0){
                createChild();
            }else{
                stage.addEventListener(Event.RESIZE,onResize);
            }
        }

        private function onResize(e:Event):void
        {
            if (stage.stageWidth>0 && stage.stageHeight>0){
                stage.removeEventListener(Event.RESIZE,onResize); //删除事件监听
                createChild();
            }
            //否则继续监听事件，直到stage.stageWidth和stage.stageHeight大于0时才初始化
        }

        private function createChild():void
        {
            //进行初始化操作，创建各对象
            //.......................
            var w:Number = stage.stageWidth;
            var h:Number = stage.stageHeight;

            txt.appendText(w + " x " + h + "\n");
        }

    }
}