🚀 go-pugleaf

In article <740@.econ.vu.nl>, walther@econ.vu.nl (Walther Schoonenberg/10000) writes:
> 
> Hello all of you,
> 
> I've got a little RISCOS_LIB C problem. I don't know how to make a
> nested menu structure in C. If you do, for instance, the following:
> 
>   menu temp[5];
> 
>   temp[0] = menu_new("Main menu",">Info,Why,Quit");
>   temp[1] = menu_new("Why","Can't,I,Do,This?");
>   menu_submenu(temp[0],2,temp[1]);
>   temp[2] = menu_new("I","Do,This?");
>   menu_submenu(temp[1],2,temp[2]);
>   temp[3] = menu_new("Do","This?");
>   menu_submenu(temp[1],3,temp[3]);
> 
>   return temp[0];
> 
> In this example I want to create this menu structure:
> 
> 
> Main Menu   first level  second level
> ---------
> Info  ->    InfoProg box
> Why   ->    Why
> Quit        ---
>             Can't
>             I       ->  I
>                         --
>                         Do
>                         This?
>             Do      ->  Do
>             This?       --
>                         This?
> 
> 
> This doesn't work. The temp[[3] submenu disappears completely, without
> any warning or error message. Why? Maybe this is not a 'strict hierarchy'
> about which the manual talks. But what is a strict hierarchy exactly and
> if it is not possible to use menu_submenu to create the above menu
> structure, how could you make such a menu structure ?
> 
> Any help greatly appreciated.
> 
> Greetings,
>             Walther
> 
> ==============================================================================
> Walther Schoonenberg
> Vakgroep Econometrie
> Faculteit der Econonomische Wetenschappen en Econometrie   *       *    * * *
> Vrije Universiteit                                         *   *   *   *
> De Boelelaan 1105                                          *   *   *    * *  
> 1081 HV Amsterdam                                          *   *   *        *
> The Netherlands                                              *   *     * * *
> (020) 5483609                                              walther@econ.vu.nl
> ==============================================================================
-- 



I seem to remember having a problem like this once.  The solution is to attach
the submenus in the correct order i.e. attach temp[2] and temp[3] to temp[1]
then attach temp[1] to temp[0].  In other words, you can't attach a submenu to
a submenu, so you have to attach the submenu to a top level menu menu, then
attach this menu to the higher level menu.
Hope this is clearer.



Colin
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