Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ukma!gatech!utkcs2!alphard!battle
From: battle@alphard.cs.utk.edu (David Battle)
Newsgroups: comp.windows.x
Subject: Re: Automatic relayout/resize of Athena Form Widget
Summary: try this program
Keywords: athena form widget
Message-ID: <889@utkcs2.cs.utk.edu>
Date: 19 May 89 17:50:29 GMT
References: <885@utkcs2.cs.utk.edu>
Sender: sysmgr@utkcs2.cs.utk.edu
Reply-To: battle@utkcs2.cs.utk.edu (David Battle)
Organization: CS Dept -- University of TN, Knoxville
Lines: 84

In article <885@utkcs2.cs.utk.edu> I wrote:

>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].

(Some adjectives which don't apply in the general case were removed. )

Here is a program which illustrates the problem I described in my
previous article.  Just compile with the command:

	cc -o resize resize.c -lXaw -lXmu -lXt -lX11

I can't imagine the behavior this program exhibits being "correct".
(The viewport widget and it's contents shrink away to nothing.)  Try it,
I think you will find it very frustrating.  You will get different
results by pressing the buttons in a different order.

Once again, can anyone shed any light on this problem?

				-David L. Battle
				 battle@utkcs2.cs.utk.edu
				 battle@esddlb.esd.ornl.gov

#include <stdio.h>
#include <X11/Intrinsic.h>
#include <X11/Command.h>
#include <X11/Form.h>
#include <X11/Box.h>
#include <X11/Viewport.h>
#include <X11/StringDefs.h>

#define TEN 10

void DeleteMe(w, client_data, call_data)
Widget w;
caddr_t client_data, call_data;
{
    static int count = 0;

    XtDestroyWidget(w);
    count++;
    if(count >= TEN)
        exit(1);
}

main(argc,argv)
char **argv;
{
    Widget toplevel, box, view, form, commands[TEN];
    int i;
    static Arg view_args[] = {
        { XtNallowVert, (XtArgVal) True },
        { XtNheight, (XtArgVal)50 },
        { XtNwidth, (XtArgVal)150 }, 
    };
    static XtCallbackRec callbacks[] = {
        { DeleteMe, NULL },
        { NULL, NULL },
    };
    static Arg command_args[] = {
        { XtNfromVert, (XtArgVal) NULL },
        { XtNcallback, (XtArgVal)callbacks },
    };


    toplevel=XtInitialize("resize","Resize", 0, 0, &argc, argv);
    box = XtCreateManagedWidget("box", boxWidgetClass, toplevel, 0, 0);
    view = XtCreateManagedWidget("view", viewportWidgetClass,
      box, view_args, XtNumber(view_args));
    form = XtCreateManagedWidget("form", formWidgetClass, view, 0, 0);
    for(i = 0; i < TEN; i++) {
        commands[i] = XtCreateManagedWidget("Delete",commandWidgetClass,form,
          command_args, XtNumber(command_args));
        command_args[0].value = (XtArgVal)commands[i];
    }
    XtRealizeWidget(toplevel);
    XtMainLoop();
}