Input.as

package input
{
    import flash.display.Stage;
    import flash.events.KeyboardEvent;

    /**
     * ...
     * @author Yury Grigoryev
     */
    public class Input
    {

        private static var _stage: Stage;

        private static var _keyDownStatus: Array;

        public function Input()
        {

        }

        public static function init(stg: Stage):void
        {
            _stage = stg;

            _keyDownStatus = new Array(500);

            for each( var status: Boolean in _keyDownStatus ) {
                status = false;
            }

            _stage.addEventListener( KeyboardEvent.KEY_DOWN, keyDownHandler );
            _stage.addEventListener( KeyboardEvent.KEY_UP, keyUpHandler );
        }

        public static function isKeyDown( key:int ): Boolean
        {
            return _keyDownStatus[ key ];
        }

        public static function isKeyUp( key:int ): Boolean
        {
            return !_keyDownStatus[ key ];
        }

        private static function keyDownHandler( event: KeyboardEvent ):void
        {
            _keyDownStatus[ event.keyCode ] = true;
        }

        private static function keyUpHandler( event: KeyboardEvent ):void
        {
            _keyDownStatus[ event.keyCode ] = false;
        }

    }

}