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From: dcr0@gte.com (David Robbins)
Newsgroups: comp.windows.x.motif
Subject: Re: making our own widget class under XmPrimitive -- but no 3D??
Message-ID: <10675@bunny.GTE.COM>
Date: 28 Feb 91 13:56:43 GMT
References: <1991Feb26.092658@wsl.dec.com>
Distribution: na
Organization: GTE Laboratories Incorporated, Waltham MA
Lines: 31

From article <1991Feb26.092658@wsl.dec.com>, by klee@wsl.dec.com (Ken Lee):
> 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).
> 
> You didn't post any sample code, so I'm just guessing.  How are you
> attempting to draw the 3D shadow?  Remember that XmPrimitive has no
> drawing procedure, so you must draw everything that is displayed in
> your widget's window.  XmPrimitive does, however, provide GC resources
> that make the 3D shadow easy.

I've addressed a similar problem with Motif 1.0.3.  I learned that you
need to do the drawing of the shadows yourself, in your Expose procedure.
Fortunately, you don't really need to know all about *how* do draw shadows.
There exists an undocumented (at least in 1.0.3) function that knows how
to draw shadows, and you just call it from your Expose procedure:

   _XmDrawShadow(XtDisplay(widget), XtWindow(widget),
      widget->primitive.bottom_shadow_GC,
      widget->primitive.top_shadow_GC,
      widget->primitive.shadow_thickness,
      x, y, width, height);

(where x, y, width, height describe the outside bounds of the area to be
shadowed -- perhaps x=0, y=0, width and height from widget->core).
-- 
Dave Robbins                    GTE Laboratories Incorporated
drobbins@bunny.gte.com          40 Sylvan Rd.
...!harvard!bunny!drobbins      Waltham, MA 02254
CYA:  I speak only for myself; GTE may disagree with what I say.