public class Key
{
import flash.display.Stage;
import flash.events.Event;
import flash.events.KeyboardEvent;
private static var initialized:Boolean = false;
private static var keysDown:Object = new Object();
//player controlls
public static const USE:uint = 88;
public static const SHOOT:uint = 32;
public static const SHOOT2:uint = 40;
public static const ACCELERATE:uint = 38; //TODO: set all these with XML!
public static const LEFT:uint = 37;
public static const RIGHT:uint = 39;
/**
* Initializes the key class creating assigning event
* handlers to capture necessary key events from the stage
*/
public static function initialize(stage:Stage) {
if (!initialized) {
// assign listeners for key presses and deactivation of the player
stage.addEventListener(KeyboardEvent.KEY_DOWN, keyPressed);
stage.addEventListener(KeyboardEvent.KEY_UP, keyReleased);
stage.addEventListener(Event.DEACTIVATE, clearKeys);
// mark initialization as true so redundant
// calls do not reassign the event handlers
initialized = true;
}
}
/**
* Returns true or false if the key represented by the
* keyCode passed is being pressed
*/
public static function isDown(keyCode:uint):Boolean {
if (!initialized) {
// throw an error if isDown is used
// prior to Key class initialization
throw new Error("Key class has not been initialized.");
}
return Boolean(keyCode in keysDown);
}
/**
* Event handler for capturing keys being pressed
*/
private static function keyPressed(event:KeyboardEvent):void {
// create a property in keysDown with the name of the keyCode
//trace(event.keyCode);
keysDown[event.keyCode] = true;
}
/**
* Event handler for capturing keys being released
*/
private static function keyReleased(event:KeyboardEvent):void {
if (event.keyCode in keysDown) {
// delete the property in keysDown if it exists
delete keysDown[event.keyCode];
}
}
/**
* Event handler for Flash Player deactivation
*/
private static function clearKeys(event:Event):void {
// clear all keys in keysDown since the player cannot
// detect keys being pressed or released when not focused
keysDown = new Object();
}
}
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