[djyamato]

AutoresizeTextArea.as

package com 
{
  import flash.events.Event;
  import flash.text.TextFieldAutoSize;
  import mx.controls.TextArea;
 
  public class AutoresizeTextArea extends TextArea 
  {
    public function AutoresizeTextArea() 
    {
      super();
      horizontalScrollPolicy = "off";
      verticalScrollPolicy = "off";
      this.addEventListener(Event.CHANGE, function(event:Event):void {
        invalidateSize();
      });
    }
 
    override protected function childrenCreated():void 
    {
      this.textField.autoSize = TextFieldAutoSize.LEFT;
      this.textField.wordWrap = false;
      super.childrenCreated();
    }
 
    override protected function measure():void 
    {
      super.measure();
      measuredWidth = textField.width;
      measuredHeight = textField.height;
    }
  }
}