Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!sps!arm
From: arm@sps.com (Annette Myjak)
Newsgroups: comp.windows.x.motif
Subject: Selection Box List Item Problem
Message-ID: <264@sps.com>
Date: 22 Aug 90 18:54:02 GMT
Organization: SPS - Indialantic, FL
Lines: 51

I am having problems with items not always appearing in the list for the 
selection box widget.

I need to use the same selection box widget OVER and OVER and OVER -- with
a different set of items most of the time.

I have an array of structures which contains pointers to "name"s for each of
the things in the array.  I have a function that processes through
this array to create an array of XmStrings of the "name"s, and a variable
that keeps track of the number of things in the array.

I set XmNlistItems to my array of XmStrings, and set XmNlistItemCount to
my counter variable, and manage the selection box widget.  

Each time time I need the selection box, my application executes the functions
to process the array of structures info into an array of XmStrings and sets
the appropriate values for the selection box and then manages the widget. 

Originally, this works just fine:  i have 3 things in the array and i see 3 
items in my list.

NOW:

if i add a new thing to my original array, only the first 2 items of the array
appear.  if i click the mouse in the space where the 3rd item is supposed to 
be, wa-la, it appears.  BUT the new item added to the array, (and supposedly 
to the item list does not appear).

the next time through this process, the first 3 items appear. if i click in
the space for a fourth item, the one i added (a long time ago, in a galaxy
far, far away . . .) appears!

The next time through the selection box, all 4 items appear.

This process repeats itself each time i add a new thing to the original array.

I know that the information is added into the array.  I know that the counter
of how many things are in the array is correct.  I know that 
XmNlistVisibleItemCount is greater than the number of things in my list
(although I don't understand why is changes from '8' to '7'  the second
time through after adding a new thing to the array).

So why are things that are really there not there, and why are things that got
added (and should be there) aren't (until some future time)?

(now is everyone as confused as I am???)

Any insight would be greatly appreciated.

Annette Myjak
arm@sps.com