FlashPunk and AIR - How to obtain the Window Dimensions

FPDemo.as

package  
{
	import flash.desktop.NativeApplication;
	import flash.events.Event;
	import flash.events.NativeWindowBoundsEvent;
	import net.flashpunk.Engine;
	import net.flashpunk.FP;
	import net.flashpunk.Screen;
	/**
	 * ...
	 * @author Richard Marks
	 */
	public class FPDemo extends Engine 
	{
		
		public function FPDemo() { super(800, 600); }
		
		override public function init():void 
		{
			
			FP.engine.addEventListener(Event.ACTIVATE, OnActivate);
			
			super.init();
		}
		
		private function OnActivate(e:Event):void 
		{
			if (NativeApplication.nativeApplication.activeWindow)
			{
				trace("Window Dimensions:", NativeApplication.nativeApplication.activeWindow.width + "x" + 
				NativeApplication.nativeApplication.activeWindow.height);
				
				FP.stage.nativeWindow.addEventListener(NativeWindowBoundsEvent.RESIZE, OnResize);
			}
		}
		
		private function OnResize(e:Event):void
		{
			if (NativeApplication.nativeApplication.activeWindow)
			{
				trace("Window Dimensions:", NativeApplication.nativeApplication.activeWindow.width + "x" + 
				NativeApplication.nativeApplication.activeWindow.height);

				// resize flashpunk to handle the new window size
				FP.width = NativeApplication.nativeApplication.activeWindow.width;
				FP.height = NativeApplication.nativeApplication.activeWindow.height;
				FP.screen = new Screen;
				FP.bounds.width = Number(FP.width);
				FP.bounds.height = Number(FP.height);
			}
		}
		
	}
}