KeyboardEvent problem

1

Hi there.

I’m doing a test on AS3 event system.


import flash.events.KeyboardEvent;
function detectKeyDown(e:KeyboardEvent):void {
    trace(e.keyCode);
}
stage.addEventListener(KeyboardEvent.KEY_DOWN, detectKeyDown);

The above code is on the main timeline. It works and traces every key press I made. But on line 5, if I remove “stage.” before addEventListener(…), I can’t trace a thing.


package {
    import flash.display.Sprite;
    import flash.events.KeyboardEvent;
    public class ShroudClearer extends Sprite {
        public function ShroudClearer(xPos:Number,yPos:Number) {
            x = xPos;
            y = yPos;
            addEventListener(KeyboardEvent.KEY_DOWN, detectKeyDown);
        }
        public function detectKeyDown(e:KeyboardEvent):void {
            trace(e.keyCode);
            x++;
            y++;
        }
    }
}

I created a class, created an instance of this class by:
var myShroudClearer:ShroudClearer = new ShroudClearer(0,0);
on timeline.

Nothing happens when I press any key.

So WHY, for the former and latter cases?

Thanks in advance.
Felastine.