Question

I am a little confused by this concept.

If I override a public function in a base class, I would have thought that this override function is called and the original is ignored? though this doesn’t seem to be the case…

public class AbstractScreen extends Sprite
{

    public function AbstractScreen() 
    {

    }


    public function updateLanguage():void
    {
        trace("WARNING: need to override public function updateLanguage()");
    }
}

---

public class Start extends AbstractScreen
{
    override public function updateLanguage():void
    {
        title.text = _model.language.start
        title.setTextFormat(titleFormat);
    }
}

---

public class ViewManager extends Sprite
{
    private var _model:Model;
    private var _screens:Array;


    public function ViewManager(model:Model) 
    {
        _model = model;

        _model.addEventListener(AppEvent.INIT_VIEW, initViews);
        _model.addEventListener(AppEvent.UPDATE_VIEW, updateView);
        _model.addEventListener(AppEvent.CHANGED_LANGUAGE, changeLanguage);
    }

    private function initViews(e:AppEvent):void
    {
        trace("View Manager: initViews");
        _screens = new Array(new Start(_model), new TakePhoto(_model));
        dispatchEvent(new ViewEvent(ViewEvent.VIEW_READY));
    }

    private function changeLanguage(e:AppEvent):void
    {
        for each (var screen:AbstractScreen in _screens)
        {
            screen.updateLanguage();
        }
    }
}

If my model dispatches a CHANGED_LANGUAGE event, the text in the views gets updated, But I also get a trace of “WARNING: need to override public function updateLanguage()” What could I be doing wrong?

Answer 1

You are right, this should not call the base class function. Are you sure there is no call to

super.initLanguage()

within your override?

Most IDE’s add this call in the function body automatically, if they create an override for you.

EDIT

From your edit I see your are iterating over two objects of the types Start and TakePhoto. I assume TakePhoto is also derived from AbstractScreen and the trace may be comming from this one.

Also I suggest to use the abstract base class in your iteration.

for each (var screen:AbstractScreen in _screens)
{
    screen.updateLanguage();
}