KeyChecker

Код AS3:

package utils
{
	import flash.display.DisplayObject;
	import flash.display.DisplayObjectContainer;
	import flash.display.Stage;
	import flash.events.KeyboardEvent;
 
	/**
	 * ...
	 * @author Mikhail Klabukov (SaintPartizan) Q_QWERT@mail.ru
	 */
	public class KeyCheck extends Object
	{
		private var _stage:Stage
		private var _keys:Array = [];
 
		public function KeyCheck(stage:Stage):void {
 
			if (stage as Stage) {				
				_stage = stage;
			}else {
				throw new ArgumentError("Stage needed")
			}
 
			_stage.addEventListener(KeyboardEvent.KEY_UP, keyUp, false, 0, true);
			_stage.addEventListener(KeyboardEvent.KEY_DOWN, keyDown, false, 0, true);
		}
 
		private function keyDown(e:KeyboardEvent):void 
		{
			_keys[e.keyCode] = true;
		}
 
		private function keyUp(e:KeyboardEvent):void 
		{
			_keys[e.keyCode] = false;
		}
		public function isDown(keyCode:int):Boolean {
			var down:Boolean = false;
			if (_keys[keyCode]) {
				down = true;
			}
			return down;
		}
	}
 
}