gistfile1.txt

import flash.utils.Timer;
import flash.events.TimerEvent;

// Flags for which keys are pressed, so the next tick moves the ball
var keys:Object = {
    right: false,
    left: false,
    up: false,
    down: false
};

// When a key is pressed, activate the flag
addEventListener( KeyboardEvent.KEY_DOWN, function (e:KeyboardEvent):void {
    if ( e.keyCode == Keyboard.RIGHT ) {
        keys["right"] = true;
    }
    // ... etc...
} );
// When a key is up, deactivate the flag
addEventListener( KeyboardEvent.KEY_UP, function (e:KeyboardEvent):void {
    if ( e.keyCode == Keyboard.RIGHT ) {
        keys["right"] = false;
    }
} );

var gameLoop:Timer = new Timer(10); // Every 10 ms, or 0.01 seconds
gameLoop.addEventListener( TimerEvent.TIMER, function (e:TimerEvent):void {

    // If keys are pressed, move the ball
    if ( keys["right"] ) {
        // Move ball to the right
    }
    else if ( keys["left"] ) {
        // Move ball to the left
    }
    if ( keys["up"] ) {
        // Move ball up 
    }
    else if ( keys["down"] ) { 
        // Move ball down
    }

    // Check if ball hit a paddle

    // Check if ball is outside the map

});