How do you addChild from a class?

[xTLS]

Hello, I'm trying to have a class file which can add objects to the stage via addChild; however, when I call addChild from within the class file, I get the error "1180: Call to a possibly undefined method addChild." I've tried importing flash.display.* and that doesn't fix the problem. Does the class file have to extend Sprite or MovieClip to be able to add objects to the stage?

[kglad]

your class instance must extend the displayobject.  so yes, extending sprite or movieclip would work.

or you can pass a displayobject reference to your class and apply the addChild() method to that reference.

[relaxatraja · Accepted solution]

A sample document class:

package  {
    import flash.display.MovieClip;
   
    public class test extends MovieClip {
        public function test() {
            // constructor code
            var test:MovieClip=new t();
            addChild(test);
           
        }
    }
}

t is the movieclip which have t as a class name in the library.

[xTLS]

All right, thank you, that's very helpful.

Another related question: is it possible to have a class that extends MovieClip but uses a specific graphic? Er, to better explain, say I have in my library:

A MovieClip named MCBox

A Class named ClassBox which Extends MovieClip

Is it possible to make it so if I make a new instance of ClassBox and add it to the stage, it uses the MCBox graphic? And I can just change the x,y, etc like normal (i.e. ClassBox.x=25)? Or would I have to make the MCBox a property, and refer to it like "ClassBox.image.x=25" or similarly?

Really appreciate the help! Sorry for not responding sooner, I've been very busy.

[kglad]

right click your library movieclip, tick export for actionscript and assign a class (eg, ClassBox) that matches your class file.  when you create an instance of ClassBox:

var cb:ClassBox=new ClassBox();

the constructor in your class file will execute.

and yes, you can use

cb.x=

cb.y=

where you create your cb instance or you can assign those properties in your class file (or do both).

[xTLS]

Oooh, I never knew that. Thanks!

EDIT: The constructor in my custom class file is supposed to take an argument, but if I follow the format var cb:ClassBox=new ClassBox(argument), I get the wrong number of arguments (expected 0) error, so I don't think it's calling the correct constructor. Any thoughts?

[kglad]

your class isn't being used because of a typo or path issue.

show your class code from package{  to the end of your constructor.

[xTLS]

There's no typo or path issue, if I instance the custom class separately it works fine. Could you explain in more detail how this is supposed to work?

edit: Never mind, I didn't realize from your explanation that the Class has to have the same name as the MovieClip >_< . It didn't complain when I tied it to a class with a different name, and it worked if I didn't try to pass it any parameters, so I was confused.

[kglad]

if this issue is resolved, please mark helpful/correct responses, if there are any.