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From: envbvs@epb2.lbl.gov (Brian V. Smith)
Newsgroups: comp.windows.x
Subject: Re: Automatic relayout/resize of Athena Form Widget
Keywords: athena form widget
Message-ID: <2689@helios.ee.lbl.gov>
Date: 20 May 89 00:52:16 GMT
References: <889@utkcs2.cs.utk.edu> <885@utkcs2.cs.utk.edu>
Sender: usenet@helios.ee.lbl.gov
Lines: 36

In article <889@utkcs2.cs.utk.edu>, battle@alphard.cs.utk.edu (David Battle) writes:

> >Now comes the problem.  When I delete one of the subordinate ... widgets
> >with XtDestroyWidget, the parent form widget resizes itself smaller.  This
> >is to be expected, I suppose, except that it seems to over do it.  It then
> >proceeds to reduce the ... size of each of the remaining subordinate
> >... widgets.  This continues happening each time I destroy a subordinate
> >... widget until some minimum ... size for each sub[widget] is aparently
> >reached.  At this point, it is impossible to read the text inside the ...
> >widgets because they are so [small].
> 

  [ program follows to demonstrate the shrinking widget ]

I have found that in working with widgets one must "chain" them to the
parent widget, or they get hosed when sizes change.  I added the following
arguments to command_args[] and it works pretty well (when you destroy
the subwidgets the parent doesn't get any smaller, which is what was happening
before adding these constraints). 

I confess that there may be a more appropriate way to do this, but this seems
to work.

    static Arg command_args[] = {
        { XtNfromVert, (XtArgVal) NULL },
        { XtNcallback, (XtArgVal)callbacks },
        { XtNwidth, (XtArgVal)130 },
        { XtNtop, (XtArgVal)XtChainTop},
        { XtNbottom, (XtArgVal)XtChainTop},
        { XtNleft, (XtArgVal)XtChainLeft },
        { XtNright, (XtArgVal)XtChainLeft },
     };
_____________________________________
Brian V. Smith    (bvsmith@lbl.gov)
Lawrence Berkeley Laboratory
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