Ok, i understand. The Spec famework is under development so it changes frequently.

Regarding my problem - thanks to Denis Kudriashov - the solution is simple:

initializeWidgets
        ...
        locationField := LocationFieldMorph new asSpecAdapter.
        "adding these two lines below forces morph to occupy all layout cell"
        locationField morph vResizing: #spaceFill.
        locationField morph hResizing: #spaceFill.
        ...


On Mon, 7 Nov 2016 06:26:41 -0800 (PST)
"jfabry [via Smalltalk]" <[hidden email]> wrote:

>
>
> I understand what you are asking, in previous versions of the documentation we had something like this. However this turned out to be a bad idea since this is too closely linked to the actual implementation. Making internal changes to the Spec interpreter means that this documentation also needs to be updated. We don���t have the resources for that, sadly this documentation became out of date and simply wrong so we had to remove it.
>
> So for what you are asking the code is the only reference, sorry.
>
> --
> Does this mail seem too brief? Sorry for that, I don���t mean to be rude! Please see http://emailcharter.org <http://emailcharter.org/> .
>
> Johan Fabry   -   http://pleiad.cl/~jfabry
> PLEIAD and RyCh labs  -  Computer Science Department (DCC)  -  University of Chile
>
> > On 06 Nov 2016, at 18:23, vikenti <[hidden email]> wrote:
> >
> > Maybe you can give some brief explanaition how to create Spec-compatible custom UI control? (Like TextModel or ButtonModel, etc.) How to create model class, corresponding adapter and how to process common and custom UI events (mouse\keyboard\focus ordering\changing).
> > I think such guide should also be included in Spec booklet.
>
>
>
>
>
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