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From: Volkher Kaschlun <volkher@studserver.uni-dortmund.de>
Newsgroups: comp.lang.beta
Subject: Re: Problems with motif/list/itempos
Date: Sun, 27 Sep 1998 02:50:17 +0200
Organization: University of Dortmund, Germany
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Message-ID: <Pine.LNX.3.96.980927023929.1451A-100000@brain.hrz.uni-dortmund.de>
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To: Mjolner Support <support@mjolner.dk>, 
    Arne Hueggenberg <zalaster@nef.wh.uni-dortmund.de>
In-Reply-To: <360BEF6D.7FA8FF1F@nef.wh.uni-dortmund.de>
Xref: news.daimi.aau.dk comp.lang.beta:11717

On Fri, 25 Sep 1998, Arne Hueggenberg wrote:

> Hello everyone,
> 
> Im looking for help with a slight problem i have.
> 
> Inside my app i do something like this:
> 
> List: @ScrolledList
>   (#
>      defaultActionCallback:: 
>        (# item: @motifstring; posofitem: @integer; 
>        do
>           data.item->item;
>           item->itempos->posofitem;
>           posofitem->putint;
>           posofitem->Mailhandler.getentry->editor.value;
>         #);
>          init:: 
>            ...; 
>      #);
> 
> The problem now is that no matter wich listentry i doubleclick,
> resulting in the defaultactioncallback, posofitem always is 0.
> Looking at what itempos is doing i see that it calls XmListItemPos.
> Now, looking in my ORA Motif Programming Manual, i see that
> XmListItemPos returns 0 if it didnt find the item in the list.
> Why cant it find the item?
> As I look for an item wich i very well know to be there, i selected it
> from the list after all, i dont see how this is possible.
> 
> Can anyone help me with this?
> 
> Regards,
> 	Arne Hueggenberg

Hello!
itemPos do not get the result from XmListItemPos, and so the value is 0
(also in itemExists). When you look at the do-part of itemPos you see 
(#  do (thewidget,item)->XmListItemPos #).
but it has to be 
(#  do (thewidget,item)->XmListItemPos->value #)

You can call XmListItemPos direct and it works fine

List: @ScrolledList
       (#
          defaultActionCallback::
            (#
               item: ^motifstring; posofitem: @integer; 
            do
               &motifstring[]->item[];
               &motifstring[]->item2[];
               data.item->item;
               item.getText->putText;
               (* item->itempos->posofitem; *)
               (thewidget,item)->XmListItemPos->posofitem;
               posofitem->Mailhandler.getentry->editor.value;
               posofitem->putint;
               newline;
               itemcount->putInt;
               newline;
               
            #);
          
       #)

regards
	Volkher Kaschlun

e-mail: su0056@studserver.uni-dortmund.de
        (kaschl00@marvin.informatik.uni-dortmund.de)
        (volkher@free.de)      (volkher@writeme.com)
Home-Page: http://studserver.uni-dortmund.de/~su0056