Helper state for getting codes for button on gamepad

GetButtonCodesState

package ;
import flixel.FlxG;
import flixel.FlxState;
import flixel.text.FlxText;
import flixel.util.FlxColor;

#if cpp
import openfl.events.JoystickEvent;
#end

/**
 * ...
 * @author Zaphod
 */
class MenuState extends FlxState
{
	var message:FlxText;
	var messageString:String;
	
	override public function create():Void 
	{
		FlxG.cameras.bgColor = FlxColor.GRAY;
		
		#if cpp
		FlxG.stage.addEventListener(JoystickEvent.BUTTON_DOWN, onJoystickButtonDown);
		FlxG.stage.addEventListener(JoystickEvent.BUTTON_UP, onJoystickButtonUp);
		#end
		
		messageString = "";
		message = new FlxText(10, 10, FlxG.width - 10, messageString, 16);
		message.setFormat(null, 16, 0x000000, "left");
		add(message);
		
		super.create();
	}
	
	#if cpp
	private function onJoystickButtonUp(e:JoystickEvent):Void 
	{
		messageString += "\nButtonUp: " + e.id;
	}
	
	private function onJoystickButtonDown(e:JoystickEvent):Void 
	{
		messageString += "\nButtonDown: " + e.id;
	}
	#end
	
	override public function update():Void 
	{
		var lines:Array<String> = messageString.split("\n");
		var maxLines:Int = 10;
		if (lines.length > maxLines)
		{
			messageString = "";
			for (i in (lines.length - maxLines)...lines.length)
			{
				if (i != (lines.length - maxLines))
				{
					messageString += "\n";
				}
				messageString += lines[i];
			}
		}
		
		message.text = messageString;
		
		super.update();
	}
}