Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!sdd.hp.com!hplabs!nsc!voder!dtg.nsc.com!shay
From: shay@dtg.nsc.com (Shay Ben-Chorin)
Newsgroups: comp.windows.x.motif
Subject: Possible bug in Motif1.1
Keywords: Motif1.1, XmScrolledWindow, XmRowColumn
Message-ID: <1581@ace.nsc.com>
Date: 13 Dec 90 00:23:19 GMT
Organization: National Semiconductor, Santa Clara
Lines: 108



Hi, 
I am using Motif 1.1 on Sun4/110 and have problems with combination of scrolled
window and row column widget. I create the following widget tree:

                       toplevel
                          |
                    XmScrolledWindow
                          |
                     XmRowColumn
                          |
                     XmToggleButton 

When I destroy the toggle button (by calling the destroy_callback) in X11R4
(fix level 18 with twm or mwm) I get a bottom scrollbar with a tiny center bar 
although the window is empty. In Open Windows (rev 2 with twm) the program 
exits as soon as I destroy the toggle button with the following error message:

[ace]2% bug
X Error of failed request:  BadAlloc (insufficient resources for operation)
  Major opcode of failed request:  12 (X_ConfigureWindow)
  Minor opcode of failed request:  128 
  Resource id in failed request:  0x0 
  Serial number of failed request:  86 
  Current serial number in output stream:  111 
[ace]3%  

This is my test program bug.c  (you can try to run it...)

======================== CUT HERE ===============================
#include <stdio.h>
#include <X11/StringDefs.h>
#include <X11/Intrinsic.h>
#include <X11/Shell.h>
#include <Xm/Xm.h>
#include <Xm/ScrolledW.h>
#include <Xm/BulletinB.h>
#include <Xm/RowColumn.h>
#include <Xm/ToggleB.h>

void create_windows();
void destroy_callback();

int main( argc, argv )
  int   argc;
  char *argv[];
{
  Widget toplevel;

  toplevel = XtInitialize( argv[0], "Bug", NULL, 0, &argc, argv );
  create_windows( toplevel ); 
  XtRealizeWidget( toplevel );
  XtMainLoop();
}

void create_windows( parent )
  Widget parent;
{
  Widget swindow, rowcol, toggle, Widget bboard;
  int n;
  Arg    wargs[15];

  n = 0;
  XtSetArg( wargs[n], XmNscrollingPolicy, XmAUTOMATIC );  n++; 
  swindow = XmCreateScrolledWindow ( parent, "swindow", wargs, n );
  XtManageChild ( swindow );

  n = 0;
  XtSetArg( wargs[n], XmNorientation, XmHORIZONTAL ); n++;
  XtSetArg( wargs[n], XmNspacing, 5 ); n++;
  rowcol = XtCreateManagedWidget( "rowcol", xmRowColumnWidgetClass,
                                   swindow, wargs, n );
  n = 0;
  toggle = XtCreateManagedWidget( "toggle", xmToggleButtonWidgetClass,
                                   rowcol, wargs, n );
  XtAddCallback( toggle, XmNarmCallback, destroy_callback, toggle );
}

void destroy_callback( w, client_data, call_data )
  Widget w;               
  Widget client_data;
  XmListCallbackStruct  *call_data;
{
  XtDestroyWidget( w );
}

======================== CUT HERE ===============================
This is my make file:

CC      = cc
CFLAGS  = -D_NO_PROTO -g
IDIR  =  -I/usr/include/X11
LIB   = -lXm -lXt -lX11

bug: bug.o
      $(CC) -o bug bug.o $(IDIR) $(LIB)

bug.o: bug.c
      $(CC) -c $(CFLAGS) bug.c $(IDIR) $(LIB)


Is this a bug? How can I fix the problem? (except for creating a dummy widget
inside rowcol that will always stay there).
	
Thanks, 

Shay