package { import flash.display.Sprite; public class STKI extends Sprite { // this stores all key states // For some reason this seems to be smaller when typed public var k:Object; private var block:Sprite; public function STKI () { k = { }; // shorthand for initializing a object // the trick is to use the dynamic nature of objects, // if the property exists it's overwritten, // if it doesn't it's created // the function actually gets a KeyboardEvent, but // having it untyped makes it smaller // So does using a regular ("keyDown") string instead // of the static one provided by the event. stage.addEventListener("keyDown", function(e:*):void{ k[e["keyCode"]] = true}); stage.addEventListener("keyUp", function(e:*):void{ k[e["keyCode"]] = false}); // this is just to show that it works block = new Sprite(); block.graphics.beginFill(0xff00ff); block.graphics.drawRect(-4, -4, 8, 8); block.x = 250; block.y = 250; addChild(block); addEventListener("enterFrame", handleEnterFrame); } private function handleEnterFrame(e:*):void{ // this is how you use it, just access the keyCode // in the object, it acts just as good old Key.isDown // from AS2 if (k[37]) { //left block.x -= 1; } else if (k[39]) { // right block.x += 1; } if (k[38]){ // up block.y -= 1; } else if (k[40]) { // down block.y += 1; } } } }