parent and MovieClip(root) trouble

Question

Hello I have a problem with, as the title.

In my some class when I call parent. or MovieClip(root). in constructor, trace return error NULL but if I call mentioned up appeals in other private or public function (for instance, function from addEventListener(Event.ENTER_FRAME, func); it works, why ?

Can someone please explain ?

ZuzEL ZuzEL · Accepted Answer · 2013-07-07T14:20:18

I don't clearly understand your question, but if you would call:

this.parent or this.root

in your constructor method, it will always be null because (from Adobe ref):

root

property is the top-most display object in the portion of the display list's tree structure represented by that SWF file
parent

property indicates the DisplayObjectContainer object that contains this display object

Your DisplayObject can not be added anywhere before it gets constructed. First you call

var myDisplayObject:DisplayObject = new MyDisplayObject();

and then you add it to another DisplayObject or Stage (DisplayObjectContainer)

anotherDisplayObject.addChild(myDisplayObject); /* now you have myDisplayObject parent and root property defined */

package {
import flash.display.Sprite;

public class Picture extends Sprite
{
    public function Picture() 
    {
        trace(parent) // parent is null
        addEventListener(Event.ADDED, onAdded)
    }

    private function onAdded(e:Event):void 
    {
        trace(parent) // returns parent
    }
}

}

parent and MovieClip(root) trouble

1 Answers