如何在AS3中访问另一个类

Question

Right, i've searched high and low for an answer to this, but no-one seems to have the same issue as me. I've created 3 classes all of them movieclips. 2 of them are like buttons so when pressed I want the 3rd movieclip to move to the left or right but it comes up with error 1119: Access of possibly undefined property x through a reference with static type Class. The 3 classes are all linked in the fla file so not sure why it's not as simple as just typing the class name to access it. Anyway here is the code:

First class (which I want to move using a mouse press):

package code
{
import flash.display.MovieClip;

public class Walking extends MovieClip
{
    public function Walking()
    {
        x = 600;
        y = 350;

        gotoAndStop(1);
    }
}   

}

Second class:

package code
{
import flash.display.MovieClip;
import flash.events.MouseEvent;

public class Left extends MovieClip
{
    public function Left()
    {
        addEventListener(MouseEvent.MOUSE_DOWN, moveleft);
    }

    protected function moveleft(event:MouseEvent):void
    {
        Walking.x += -10;
    }
}







}

Third Class: (havn't coded yet)

package code
{
import flash.display.MovieClip;

public class Right extends MovieClip
{
    public function Right()
    {

    }
}







}

Answer 1

I would recommend you to keep your game logic in a single class and then reference the buttons. In this case you don't even need a class for the buttons (yet). Something like this ...

//Game.as
var arrowLeft : MovieClip;
var arrowRight : MovieClip;
var walker : MovieClip;

function Game()
{
    arrowLeft.addEventListener(MouseEvent.CLICK, OnClickLeft);
    arrowRight.addEventListener(MouseEvent.CLICK, OnClickRight);
}

function OnClickLeft(pEvent : MouseEvent) : void
{
    Walk(-speed);
}

function OnClickRight(pEvent : MouseEvent) : void
{
    Walk(speed);
}

function Walk(pSpeed : Number) : void
{
    walker.x += pSpeed;
}

Answer 2

Thanks for your help guys, I re-read some more on classes and it turns out I forgot about the document class. What I needed to do was to import the movieclips to stage using the document class (Thus creating instances of them, aka instantiation) and then I was able to access the x and y properties. I was confused as to what a class was and it is just code outside of the document class and fla that links to an object like a movieclip and runs separately to the document class through all instances of the object. Anyway here is what I have now, working fine :)

Document Class:

package  {

import flash.display.MovieClip;
import code.Walking;
import code.Left;
import code.Right;
import flash.events.MouseEvent;


public class gameWalk extends MovieClip {

    public var walker:Walking;
    public var left:Left;
    public var right:Right;

    public function gameWalk()
    {
        walker = new Walking();
        left = new Left();
        right = new Right();

        addChild(walker);
        addChild(left);
        addChild(right);

        walker.x = 640;
        walker.y = 360;
        left.x = 65;
        left.y = 660;
        right.x = 1200;
        right.y = 660;

        createListeners()

    }

    public function createListeners():void
    {
        left.addEventListener(MouseEvent.CLICK, moveLeft);
        right.addEventListener(MouseEvent.CLICK, moveRight);
    }

    public function moveLeft(event:MouseEvent):void
    {
        walker.x += -10;
    }

    public function moveRight(event:MouseEvent):void
    {
        walker.x += 10;
    }
}

}

Walking:

package code
{
import flash.display.MovieClip;

public class Walking extends MovieClip
{
    public function Walking()
    {
        gotoAndStop(1);
    }
}









}

Left:

package code
{
import flash.display.MovieClip;
import flash.events.MouseEvent;

public class Left extends MovieClip
{
    public function Left()
    {

    }
}







}

Right:

package code
{
import flash.display.MovieClip;

public class Right extends MovieClip
{
    public function Right()
    {

    }
}







}