Custom preloader for Flex

package com.cravens.nr.preloader
{
	import com.cravens.nr.model.Config;
 
	import flash.display.GradientType;
	import flash.display.Sprite;
	import flash.events.Event;
	import flash.events.ProgressEvent;
	import flash.events.TimerEvent;
	import flash.geom.Matrix;
	import flash.utils.Timer;
 
	import mx.events.FlexEvent;
	import mx.preloaders.IPreloaderDisplay;
 
	public class NRPreloader extends Sprite implements IPreloaderDisplay
	{
		protected var loadingPanel:BusyPanel;
		protected var timer:Timer;
 
		public function NRPreloader()
		{
			super();
		}
		//------------------------------------------------------------------------------
		public function set preloader(preloader:Sprite):void 
		{
			preloader.addEventListener(ProgressEvent.PROGRESS, handleProgress); 
			preloader.addEventListener(Event.COMPLETE, handleComplete);
 
			preloader.addEventListener(FlexEvent.INIT_PROGRESS, handleInitProgress);
			preloader.addEventListener(FlexEvent.INIT_COMPLETE, handleInitComplete);
		}
		//------------------------------------------------------------------------------
		public function initialize():void 
		{
			var matrix:Matrix = new Matrix(0,1,1,0,0,0);
 
			graphics.beginGradientFill(GradientType.LINEAR,[0x000000,0x89265a],[1,1],[125,205],matrix);
			graphics.drawRect(0,0,Config.VIEWPORT_WIDTH,Config.VIEWPORT_HEIGHT);
 
			loadingPanel = new BusyPanel();
 
			try
			{
				loadingPanel.heading_txt.text = "LOADING ... PLEASE WAIT";
				loadingPanel.message_txt.text = "0/100%";
			}
			catch(e:Error)
			{
				throw new Error("Asset does not contain the relevant textField objects");
			}
			finally
			{
				loadingPanel.x = Config.VIEWPORT_CENTER_X-150;
				loadingPanel.y = Config.VIEWPORT_CENTER_Y;
 
				addChild(loadingPanel);
			}
		}
 
 
		//------------------------------------------------------------------------------
		// Define empty event listeners.
		private function handleProgress(event:ProgressEvent):void 
		{
			var prog:Number = Math.ceil((event.bytesLoaded/event.bytesTotal)*100);
 
			loadingPanel.message_txt.text = prog+"/100%";
		}
		//------------------------------------------------------------------------------
		private function handleComplete(event:Event):void 
		{
			loadingPanel.message_txt.text = "LAUNCHING";
		}
		//------------------------------------------------------------------------------
		private function handleInitProgress(event:FlexEvent):void 
		{
		}
		//------------------------------------------------------------------------------
		private function handleInitComplete(event:Event):void 
		{
			timer = new Timer(500,1);
			timer.addEventListener(TimerEvent.TIMER, dispatchComplete);
			timer.start();      
		}
 
		//------------------------------------------------------------------------------
		private function dispatchComplete(event:TimerEvent):void 
		{
			timer.removeEventListener(TimerEvent.TIMER, dispatchComplete);
			timer = null;
			dispatchEvent(new Event(Event.COMPLETE));
		}
 
		//------------------------------------------------------------------------------
		// Implement IPreloaderDisplay interface
 
		public function get backgroundColor():uint 
		{
			return 0;
		}
		//------------------------------------------------------------------------------
		public function set backgroundColor(value:uint):void 
		{
 
		}
		//------------------------------------------------------------------------------
		public function get backgroundAlpha():Number 
		{
			return 0;
		}
		//------------------------------------------------------------------------------
		public function set backgroundAlpha(value:Number):void 
		{
		}
		//------------------------------------------------------------------------------
		public function get backgroundImage():Object 
		{
			return undefined;
		}
		//------------------------------------------------------------------------------
		public function set backgroundImage(value:Object):void {
		}
		//------------------------------------------------------------------------------
		public function get backgroundSize():String {
			return "";
		}
		//------------------------------------------------------------------------------
		public function set backgroundSize(value:String):void {
		}
		//------------------------------------------------------------------------------
		public function get stageWidth():Number 
		{
			return Config.VIEWPORT_WIDTH;
		}
		//------------------------------------------------------------------------------
		public function set stageWidth(value:Number):void 
		{
		}
		//------------------------------------------------------------------------------
		public function get stageHeight():Number 
		{
			return Config.VIEWPORT_HEIGHT;
		}
		//------------------------------------------------------------------------------
		public function set stageHeight(value:Number):void 
		{
		}
	}
}