CODEWITHSUNDEEP
haxeaddchildopenfl
k13ran
k13ran

Reputation: 147

OpenFL - How to use addChild in another class?

The answer should be simple but I can't find out how anywhere..

So I have a Main.hx class and a ObjectManager.hx class. In the main class's constructor, it calls ObjectManager.addAllToScreen(); and my objectManager should then add the objects to the screen.

I thought this would be ok because in the constructor of Main you can just say addChild(Objects.platform); but apparently addChild isn't accessible?

The error is: Class<Main> has no field addChild so I'd guess that addChild is a method of Sprite or something?

package;

class Main extends Sprite {
    public function new() {
        super();
        ObjectManager.addAllToScreen();
    }
}

In ObjectManager:

package;

class ObjectManager {
    public static function addAllToScreen():Void {
        Main.addChild(Objects.platform);
        Main.addChild(Objects.messageField);
    }
}

UPDATE:

Ok so now the code is this... and it runs just fine apart from the objects never showing up on screen - however if the addChild code is put in main, they do show up.

Main:

class Main extends Sprite {

public function new() {
    super();
    var objectManager = new ObjectManager();
    objectManager.addAllToScreen();
}

ObjectManager:

package;
import openfl.display.Sprite;    

class ObjectManager extends Sprite {
    public function new() {
        super();
    }
    public function addAllToScreen() {
        addChild(Objects.platform);
        addChild(Objects.messageField);
    }
}

Upvotes: 2

Views: 929

Answers (2)

BumbleBirds
BumbleBirds

Reputation: 45

You just need to pass a reference to the stage to your ObjectManager class so you can add things to it later on.

Check this out.

Main.hx

package;

import openfl.display.Sprite;

class Main extends Sprite {
    public function new () {
        super();

        ObjectManager.setup(stage);
        ObjectManager.addAllToScreen();
    }
}

ObjectManager.hx

package ;

import openfl.display.Sprite;
import openfl.display.Stage;

class ObjectManager {

    // The reference to the applications stage
    private static var stage:Stage;

    // Do this first,
    // we need to hold a reference to the Stage object so we can add to it later
    public static function setup(stageref:Stage) {
        stage = stageref;
    }

    public static function addAllToScreen() {
        // An array of randomly generated sprite objects
        var sprites:Array<Sprite> = [randomSprite(), randomSprite(), randomSprite()];

        for(sprite in sprites) {
            // Position the sprites randomly over the screen
            sprite.x = Math.random() * stage.stageWidth;
            sprite.y = Math.random() * stage.stageHeight;

            // Add them to the stage
            stage.addChild(sprite);
        }
    }

    // Ignore this
    // Makes a randomly sized circle in a random colour
    private static function randomSprite():Sprite {
        var spr = new Sprite();

        spr.graphics.beginFill(Std.int(0xffffff * Math.random()), 1);
        spr.graphics.drawCircle(0, 0, (Math.random() * 100) + 20);
        spr.graphics.endFill();

        return spr;
    }
}

Upvotes: 2

larsiusprime
larsiusprime

Reputation: 935

addChild() is available in openfl.DisplayObjectContainer, which Sprite extends. So you would need to make your class extend Sprite, yes.

Upvotes: 2

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