R – Adding Flash Components to Stage Dynamically from AS3 File

actionscript-3flashflash-v3-components

When I attempt to create a new flash list component from my as3 file (FrontEnd.as) and add it to the stage, I get the following error: "1046: Type was not found or was not a compile-time constant: List". Below is the code:

package {

import flash.display.MovieClip;
import fl.controls.List;

public class FrontEnd extends MovieClip {

    public function FrontEnd():void {
        trace("FrontEnd Here");
        init();
    }

    private function init() {
        var userSelect:List = new List();
        addChild(userSelect);
        userSelect.move(200, 100);
        userSelect.width = 120;
    }
}

}

Someone commented on a livedocs page that you have to drag the component to the .fla library and cannot create it solely from as3. Is this really true? Hoping someone can set me straight, thanks.

Best Answer

That is true, Think of the UI Components in Flash as made of 2 parts:

The classes that manage the components
The visual assets of the components.

When you import the classes from actionscript alone, they will be missing the visual elements that go hand in hand with that, so just drag the List component to the Library and you should be fine.

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Flash AS3 – Button on stage will not hide if I change the label – bug or missing something

Funky one!

Didn't expect that :)

I had sort of a similar issue...well not quite. I was trying to access some clips in a later frame of a movieclip, just like in as2, but unless the playhead goes to that frame, in as3, the clips are null.

The workaround is to force the stage to invalidate and access the objects in the RENDER event ( which I think happens right before all the stuff gets rendered on stage, but after all your stuff is ready/accessible )

My guess is since you set the label in the Parameters tab, that gets evaluated after the Document class constructor, so there might be something in the Button Component invalidation that tells it to be visible. It's safer to set it invisible after all that is done.

Here is the updated code...famous last words: 'it works for me' :)

   package {   
    import flash.display.MovieClip;
    import flash.events.Event;
    public class Foo extends MovieClip{
        public function Foo(){
            //stage.invalidate() forces the stage to re-evaluate itself
            stage.invalidate();
            stage.addEventListener(Event.RENDER, stageRenderHandler);
        }
        //the RENDER events gets fired when invalidation is done
        //and everything is ready to be displayed/rendered
        private function stageRenderHandler(event:Event):void{
            hide_btn.visible = false; // Works
        }
    }   
}

R – Function executing as constructor, but not as function

Error #1006: value is not a function

This error is occurring somewhere else in your code. Does that class have a property (function get/set) by the name value? And are you trying to access it as a function? Check your code for value() and replace it with value.

Best Answer

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Flash AS3 – Button on stage will not hide if I change the label – bug or missing something

R – Function executing as constructor, but not as function

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