Re: [XForms] using fl_do_forms with tabfolders

[Jens Thoms Toerring]

Hi Patrick,

On Sun, Sep 13, 2015 at 02:03:55PM -0400, Patrick wrote:
> I have been making good progress mixing GnuCOBOL and xforms. This
> must seem strange but COBOL has excellent data description
> facilities and I am happy with the outcome.

I've no problems with that as long as it works;-)

> 
> I have so far bypassed the built in callback handling and instead I
> have been taking the returned pointer from fl_do_forms and using it
> with pure COBOL event handling code.
> 
> Now that I am scaling up I have 40 forms in a tabfolder and button
> events within the tabfolder are not being returned by fl_do_forms
> only the switching of tabs is generating events.
> 
> Is there a way to tell xforms to propagate the event back up through
> the tabfolder so I can still just use fl_do_forms?

Mmmm, the tabfolder code goes, as far as I can see, out of
its way to avoid having all these objects getting returned
by  fl_do_forms(), at least if I can trust comments like

 * For all the folders set a dummy form callback to prevent
 * the contained objects from leaking thru to fl_do_forms

But perhaps that comment also hints at a solution (but I can't
tell for sure without a lot more of reading the code for the
tabfolder object): when you add a form to the tabfolder a
callback function is set for it that does nothing and, at
least according that comment, is just for keeping the object
events making it through to fl_do_forms(). You could try to
reset the callback _after_ you've added it to the tabfolder,
using

  fl_set_form_callback( form, NULL, NULL );

That should have the effect that its objects get returned
by fl_do_forms(). But don't get angry with me if this doesn't
work or has unexpected side-effects;-) Let me know if it
works, in that case we could add that to the documentation.

                       Best regards, Jens
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