Re: [BLACKBOX] How to 'embed'

From: [at]} <Josef>
Date: Tue, 4 Oct 2011 10:21:48 +0200

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Actually, it depends on the capabilities of the model.
A TextModels.Model, for example, provides means for
embedding an arbitray Views.View into the character stream (see
TextModels.Writer.WriteView).
You can do this also with your own model but
the view used for displaying your model must be aware of
embedded views and render everything accordingly.
Rendering the embedded views will typically be delegated to
the embedded views, though.

- JT




----- Original Message -----
From: "Wojtek Skulski" <skulski{([at]})nowhere.xy
To: <BLACKBOX{([at]})nowhere.xy
Sent: Tuesday, October 04, 2011 6:42 AM
Subject: Re: [BLACKBOX] How to 'embed'


"embedding of one view into a model" is a self contradiction.

The model provides data "1, 2, 3, 4...". The data makes no assumptions how
it will be displayed, or whether it will be displayed at all.

The view imports the model. So it knows the details of the model (array,
record, list, double-linked-list, DAG, or any other fancy structure).
However, there is a firm assumption that no details about the display go
into the model. The model can only provide the numbers, but no details
about the display.

The Model-View separayion means the separation of concerns. The model can
calculate. The view can display the results of calculations.

Your question is breaking the separation. You are trying to put the
imported concerns back into the importee. This has to lead to circular
data structures. Hence, it is not implementable.

W.


> Folks,
>
> I am old and tired of poking through documentation and code.
> So if you can please help me out it would be greatly appreciated.
>
> If you search the BB documentation for the word 'embed' you find
> many hits. But no where does it explicitly state the steps needed
> to do an embedding of one view into a model.
>
> What are the least number of steps to embed a view into a model?
>
> ==
> My paltry efforts center around
>
> Views.InstallFrame(f, view, l, t, level, focus);
>
> That is, given the frame (f) of the view in which one wants to embed
> the view 'view' one does the above. BUT BB complains that view
> does not have a context nor a domain. Well that is what I was
> hoping
> the InstallFrame procedure would provide to view.
>
> So I can start and assign a context to view taken from the context
> of
> f.view.context BUT I believe that is wrong.
>
> Given a bare extension of Views.View with no additional structure
> TYPE View = POINTER TO RECORD(Views.View) END;
> as the container view I wish to embed arbitrary other Views.View
> as the contained view AND when the container view is restored
> (which unto itself does nothing) how do I get all of the contained
> views
> to restore themselves (or does that happen automatically OR do I
> need to forward a message)?
>
> Doug
>
>
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Received on Tue Oct 04 2011 - 10:21:48 UTC