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From: marbru@attc.UUCP (Martin Brunecky)
Newsgroups: comp.windows.x.motif
Subject: Re: making our own widget class under XmPrimitive -- but no 3D??
Message-ID: <1208@attc.UUCP>
Date: 2 Mar 91 19:14:19 GMT
References: <91Feb25.235707est.8813@orasis.vis.toronto.edu>
Reply-To: marbru@auto-trol.UUCP (Martin Brunecky)
Distribution: na
Organization: Auto-trol Technology, Denver
Lines: 30

In article <91Feb25.235707est.8813@orasis.vis.toronto.edu> tjhorton@vis.toronto.edu ("Timothy J. Horton") writes:
>Has anyone successfully created a widget from the XmPrimitive class?  We have,
>everything compiles, but no combination of resource settings will make the 3D
>shadow effects be drawn (even if I draw NOTHING in the window).
>
    XmPrimitive only provides resources, but no Exposure method.
    Your widget's exposure has to draw the 3D outline.

    Note, when subclassing off-of something like XmPrimitive, you better
    look at the code several times, before you decide:
    - what this superclass does FOR you
    - what this superclass does AGAINST you
    - what you can inherit
    - what you MUST override

    You MUST look at the superclass methods which are always called:
    Initialize and SetValues - normally you shoulkd like what they do,
    but sometimes they don't do enough (this may be an omission/bug),
    sometimes they do more than what you want, and you may be forced
    to un-do that. You must be cerafull about GC's created/destroyed
    /changed by your superclass. May be not in other widget sets,
    but definitelly in Motif.

    Good hacking 
    
-- 
=*= Opinions presented here are solely of my own and not those of Auto-trol =*=
Martin Brunecky                           {...}sunpeaks!auto-trol!marbru
(303) 252-2499                        (sometimes also:  marbru@auto-trol.COM )
Auto-trol Technology Corp. 12500 North Washington St., Denver, CO 80241-2404