Newsgroups: comp.windows.x.motif
Path: utzoo!utgpu!cunews!bnrgate!scrumpy!bnrmtl@bnr.ca!paar
From: paar@bnrmtl.bnr.ca (A.E. Paar)
Subject: XmList widget nuisance.
Message-ID: <1991Jun6.181622.29296@scrumpy@.bnr.ca>
Sender: news@scrumpy@.bnr.ca (USENET NEWS KJ)
Reply-To: bnrmtl!paar@larry.mcrcim.mcgill.edu
Organization: Bell-Northern Research, Montreal
Date: Thu, 6 Jun 91 18:16:22 GMT

I am having a problem with the way the XmList widget works using
XmEXTENDED_SELECT.

My problem is as follows, I build a list of XmString's based on a
list of C++ objects, in the same window I have a couple of buttons
that indicate an action to be taken on the selected items, how do
I get back to my C++ object from the selected items?  I'm using
Motif 1.0.  The most elaborate way I've tried to do it so far is to
keep the address of each XmString of the list widget after its
creation and then match the address of the selected ones after
a button press.  This doesn't work because the widget keeps a
separate list of selected XmStrings (for which it allocates and
deallocates space in memory as the selections progress, BTW does
anyone know why it's done this way, I think it's sort of silly but
I may be missing something).  All the values that I'm talking about
are fetched using XtGetValues for the XmNitems and XmNselectedItems.

The only workaround that I've managed to implement is to use
XmSINGLE_SELECT and use the item_position value in the
XmListCallbackStruct in a singleSelectionCallback.

Another problem with the XmList widget that I've encountered is that
I haven't yet found a way of changing one character of an element in
list from the code.  The only thing that I've done so far is to delete
the item at a given position, create a new XmString and insert it at
the same position.

Can anyone help me with these problems?

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aep				bnrmtl!paar@larry.mcrcim.mcgill.edu
Augustin E. Paar
Bell-Northern Research, Montreal, Quebec

Opinions are my own and often not that of my management.
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