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1994-08-27
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Subject: Re: Gem List
Date: Fri, 29 Jul 1994 14:58:30 +1000
From: Warwick Allison <warwick@cs.uq.oz.au>
Precedence: bulk
Michel Forget wrote:
>
>This is not a good approach. It limits the number of windows to 20.
>MultiTOS can have many more than that, and so can Geneva. A much
>better (though confusing) solution is to use a linked-list, or a
>dynamically allocated array. That way the list can grow indefinitely.
In GEM++, I use a linked list, and go to the trouble of maintaining the
list to be in the same order as the windows. I'm still not sure how
useful this is, since I could call wind_find(), then search an
unordered list. Comments?
I also never hold onto a window handle if the window is not open.
This means keeping my own copies of the window sizes, but again,
that hasn't been a problem. Good for older TOSes. Comments? (Hey,
maybe everyone does these things - I've not looked at the details of
many libraries).
>>Or you could just bypass form_keybd altogether.
>If you bypass objc_edit()
>or form_keybd(), then you LOSE the enhancements that the user installs
>in the AUTO folder. ...
>... There are situations where you
>might NEED to replace one of these functions, but unless you absolutely
>have to you should leave them the way they are.
This is 100% true. The trouble is, those situations (eg. to allow
scolling textfields) force you to write all the code that can be reused
in plain textfields anyway. Because functionality provided by TSRs
are not extensible. Scrolling text fields are very important (eg. if
the field is supposed to hold a filename, it is usually restricted
to 70 characters - that can be as little as 4 directories deep. It
would be difficult (but not impossible) for a TSR to support this,
since it cannot normally know how large a field the program can
handle. So while TSR's might look like a nice solution, they have
trouble providing what a library can provide.
--
Warwick