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Gerard:
Thank you for the explanation about models. Now, about the ADT.
I thought of this a little more and unless I am missing something,
I awould say "no, not possible". The reason why not is because
they provide only one way to link the control to the Dialog.
They are passing the string, which then Meta searches for
in run-time info. I am now looking at Controls definition, where
the Control.Item is read only. We cannot assign it "by hand".
I would *guess* one can force the Control.Item to a given
variable using PutVal from Meta, but this is just a guess
based on the method name PutVal, which is undocumented. They
did not document Meta too well, maybe on purpose.
I am further guessing, that within the Controls code they
extend the Item such that it matches the corresponding Dialog
data types. They then assign this specialized Item to the
Control.Item field. In such a way they customize the Control
to a given Dialog type. It might be possible to retarget such
a customized Control to take a different instance of a record
of the same type as the one which generated the control. This
is a wild guess. May or may not work, depending of what the
undocumented parts of Meta are really doing.
I would seriously question the sense of going into this low-level
stuff. Doing this is basically abusing the Dialogs/Controls combo
only because the regular language mechanism is not in place there.
I would guess that all that is needed is is another way to assign
a given Dialog to a Control, using the pointer to the Dialog.
This would make the ADT possible. If true, this is a legitimate
proposition for Ominc to implement. They may consider fixing
what was overlooked. However, there might be something deep down
in Controls which prevents the ADT. They know, we are just guessing.
> Well, the problem is that the model of a control is not allocated on the
> heap, but, as you noticed, stored in a global variable. And there is no way
> to change that. So without a wizardry, as you'd say, there is no hope to use
> at the same time more controls than there are global variables declared in
> modules. Now the questions are: 1) Is it possible to bypass this limitation?
> I'd say yes, but it's just an intuition, it must be tested at first.
I would guess no, but that's based on intuition. The gaps in documentation
are such that I do not know.
> 2) Is it worth the difficulty to develop the trick? With a little time,
> I can answer the first question. You are to answer the second one. Is it
> enough for you to be able to show at he same time only a limited set of
> controls? If your answer is no, I'll look at the first question.
I will implement a singleton linked to one global variable and I will live
with that. Right now this is a sufficient progress for me over not having
any such tool at all.
On the other hand, I think the ADT request makes perfect sense, but I
would leave it to them to consider. They know the code, we are only
guessing.
I am forwarding this to the list, maybe Ominc is listening.
Thanks a lot for your comments. Cheers,
Wojtek
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Received on Tue Jul 01 2003 - 06:08:28 UTC
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