Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.csd.uwm.edu!cs.utexas.edu!pp!kauai!duanev
From: duanev@kauai.ACA.MCC.COM (Duane Voth)
Newsgroups: comp.windows.x
Subject: more Athena Viewport widget noise
Message-ID: <303@kauai.ACA.MCC.COM>
Date: 16 Aug 89 18:31:30 GMT
Organization: MCC, Austin, TX
Lines: 29


Can anyone give a good reason for the following code in the Viewport's
DoLayout() routine?

    if (XtIsRealized(w)) {
        if (((ViewportWidget)w)->viewport.allowhoriz)
            geometry.width = Min(w->core.width, /* childs requstd */ width);
        if (((ViewportWidget)w)->viewport.allowvert)
            geometry.height = Min(w->core.height, /* childs requstd */ height);
    } else ...

When a child of a Viewport requests to be enlarged, this code is
executed and forces the child to either be as big as the current
Viewport size, or smaller.  Thus, Viewport children cannot expand
without getting saddled with scroll bars even when the Viewport's
parent is perfectly happy to accommodate an enlarge/resize request.

Perhaps this code reflects a preference for invoking scroll bars over
asking a parent for more room.  If so, it is an annoying assumption.
In my current application, I want scroll bars only if the Viewport's
parent refuses to let the Viewport grow.

duane

-- 
--- duane voth             duanev@mcc.com
----           ALL systems are arbitrary!
--- effectiveness is the measure of Truth
--