Flex 4 Auto-Resizeable TextArea Component

package cgjc.component {import flash.events.Event;import mx.controls.Alert;import mx.controls.Text;public class AdjustHeightText extends Text {public function AdjustHeightText() {super();this.addEventListener(Event.CHANGE, adjustHeightHandler);}private function adjustHeightHandler(event:Event):void {Alert.show("textField.getLineMetrics(0).height: " + textField.getLineMetrics(0).height + "\ntextHeight:" + textField.textHeight);height = textField.textHeight;//super.verticalScrollPolicy = "on";if (height <= textField.textHeight + textField.getLineMetrics(0).height) {height = textField.textHeight;validateNow();}}//该方法是Text空间自适应文本高度的方法/*override protected function measure():void {super.measure();//Alert.show("textField.getLineMetrics(0).height: " + textField.getLineMetrics(0).height + "\ntextHeight:" + textField.textHeight);measuredHeight = measuredMinHeight = textField.getExplicitOrMeasuredHeight();}*/override public function set text(val:String):void {textField.text = val;validateNow();height = textField.textHeight;validateNow();}override public function set htmlText(val:String):void {textField.htmlText = val;validateNow();height = textField.textHeight;validateNow();}override public function set height(value:Number):void {if (textField == null) {if (height <= value) {super.height = value;}} else {var currentHeight:uint = textField.textHeight + textField.getLineMetrics(0).height;if (currentHeight <= super.maxHeight) {if (textField.textHeight != textField.getLineMetrics(0).height) {super.height = currentHeight;}} else {super.height = super.maxHeight;}}}}}

原文链接：http://www.eonflex.com/?p=398