Just from AS3 not understanding multi-class interaction

Hello, I have a little game and it works fine, but when I try and divide it into classes multiple it keeps giving me problems I have spend the last 2 days on this and still do not understand what I am doing wrong. Can you help me please. Here is my code.

-So what's going on, it's that I'm just a titlemenu class that I want to have everything I want in the title menu on there when I try and add the event listener to the class he always stop saying it is a null reference, but I don't understand why this might be happneing.

package

{

import flash.display.MovieClip;

import com.natejc.input.KeyboardManager;

import com.natejc.input.KeyCode;

import flash.display.MovieClip;

to import flash.display.SimpleButton;

import flash.events.Event;

import flash.events.MouseEvent;

import flash.net.DynamicPropertyOutput;

import flash.text.TextField;

/**

* ...

* @author...

*/

SerializableAttribute public class extends MovieClip TitleScreen

{

public var btnStart: SimpleButton;

public void TitleScreen()

{

this.btnStart.addEventListener (MouseEvent.CLICK, btnStartClick);

}

/* ---------------------------------------------------------------------------------------- */

public void btnStartClick(ev:MouseEvent):void

{

gotoAndStop ("Game");

}

}

}

Main class *.

package

{

import com.natejc.input.KeyboardManager;

import com.natejc.input.KeyCode;

import flash.display.MovieClip;

to import flash.display.SimpleButton;

import flash.events.Event;

import flash.events.MouseEvent;

import flash.net.DynamicPropertyOutput;

import flash.text.TextField;

/**

* Readers project.

*

* @author Nate Chatellier

*/

SerializableAttribute public class Main extends MovieClip

{

public var tTitleScreen:TitleScreen = new TitleScreen();

public var gGameScreen:GameScreen = new GameScreen();

/* ---------------------------------------------------------------------------------------- */

/**

* Constructed the main object.

*/

public void Main()

{

KeyboardManager.init (this.stage);

}

}

}

Here is what I noticed:

  1. In your main class, you create a new TitleScreen and GameScreen, but you can't add them to the scene.

    • If you see them on stage, the ones that the Flash Player is for you and not those that you created.
    • If you have control over them, then this means that the Flash Player has replaced those that you do, then you can probably drop the part where you made them.
    • If you don't have control over them, then the rows where you created them ran after the part of the manufacturer where Flash added in step (unlikely)
    • If you don't see them, then you must add with addChild().
  2. It seems unlikely that your MC TitleScreen includes label 'game', so I think you should get an error if this line is executed. As says Kglad, being the victim of an error if you do not have an instance called btnStart on your stage. You should probably be deliver a custom event bubbling of TitleScreen and just listen for that hand and then control who really does not contain this tag game.
  3. I think you will regret making your keyboard event listener to be static, because it means that you can not have more than one (i.e. you have different people who work in different parts of the game or in the title of your next, you might want to write a different implementation). You don't show the implementation of this class, but I usually pass the stage of such Classes typed as an IEventDispatcher limit how this class needs to know. Then, I'll also give a different IEventDispatcher to broadcast 'system' events that correspond to specific keystrokes. I hope you don't give something responsible listening keyboard events real management authority, especially since he then has to find your Main Class and find out if it has properties and methods, that he needs.
  4. If you use Flash Builder, you can get rid of all these import declarations which are Classes you do not use by using Ctrl-Shift-O.

Tags: Adobe Animate

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