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From: brennan@rtp.dg.com (Dave Brennan)
Newsgroups: comp.windows.x.motif
Subject: Re: Multi-line labels
Message-ID: <BRENNAN.90Oct10224643@teton.rtp.dg.com>
Date: 11 Oct 90 02:46:43 GMT
References: <1990Aug21.000632.25880@elroy.jpl.nasa.gov>
	<9596@jpl-devvax.JPL.NASA.GOV>
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Organization: Data General, RTP, NC
Lines: 68
In-Reply-To: david@jpl-devvax.JPL.NASA.GOV's message of 20 Sep 90 23:27:46 GMT

david@jpl-devvax.JPL.NASA.GOV (David E. Smyth) writes:

   ems@socrates.jpl.nasa.gov writes:

   >   Is it possible to create multi-line labels
   >through the resource file?

   Write a string to XmString converter which looks for \n.
   Use the same name that Motif uses, and make sure the
   linker sees your converter before it sees the Motif
   converter, and you are golden.  Do a name search on
   your motf library to figure out the name you should
   export.

Actually, you don't have to go to all that trouble.  The following code
replaces the String to XmString converter so you can use \n in resources.
Just call MuInstallStringToXmStringConverter (yea, it's a long name, so sue
me! :-) before you create your first Motif widget.  (After you create the
toplevel shell would be a good time.)

/*
 *  by David Brennan (brennan@dg-rtp.dg.com)
 *
 *  This code is provided without warranty.
 */

#include <Xm/Xm.h>

static void
mu_cvt_string_to_xmstring ( XrmValuePtr args, Cardinal *num_args,
			      XrmValue *from, XrmValue *to )
{
  static char *new_string;

  if ( from->addr == NULL ) return;

  new_string = XmStringCreateLtoR ( from->addr, XmSTRING_DEFAULT_CHARSET );

  if ( new_string == NULL ) 
    {
      to->addr = NULL;
      to->size = 0;
      XtStringConversionWarning ( from->addr, XmRXmString );
    }
  else
    {
      to->addr = (caddr_t) &new_string;
      to->size = sizeof (caddr_t);
    }
}

void
MuInstallStringToXmStringConverter (void)
{
  /* first register Motif converters so that this ours don't get overridden */

  XmRegisterConverters ();

  /* now registers ours and override Motif's */

  XtAddConverter ( XmRString, XmRXmString, mu_cvt_string_to_xmstring, 
		   NULL, 0 );
}
                                          |\
Dave Brennan                              | \____oo_     brennan@rtp.dg.com
=========================================((__|  /___>    ...rti!dg-rtp!brennan
User Interfaces, Data General                | //        daveb@rpitsmts.bitnet
Research Triangle Park, NC                   |//         Phone: (919) 248-6330