From:	Doug Eleveld <deleveld AT dds DOT nl>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: About GUI's
Date:	Thu, 19 Mar 1998 02:27:44 +0100
Organization:	Rijksuniversiteit Groningen
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Message-ID:	<35107490.D0E859C3@dds.nl>
References:	<m0yEaTo-000S2nC AT inti DOT gov DOT ar>
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To:	djgpp AT delorie DOT com
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Salvador Eduardo Tropea (SET) wrote:

> Additionally it must be done with C++ or some C approach to emulate the C++
> flexibility to allow the members override. That's is: you must be able to
> redefine part or all of the behavior of a button or any other control.
> DEGUI uses call backs to do it, but it isn't enough, I have an application

Don't forget that you can derive objects from the degui classes and
override the virtual msg_xxx functions to redefine the behaviour of an
object.  i.e. the normal C++ way of interfacing gui objects.

Personally I think that that is a lot better way to do it than using
callbacks because of better encapsulation, but callbacks are useful of
you just want a small change in object behaviour and it's easier to set
one callback than derive a object, fill in constructors, override
virtual functions etc if you only want a small change. 


Doug Eleveld

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