[Haskell-cafe] Re: [Haskell] ANNOUNCE: first Grapefruit release

Wolfgang Jeltsch g9ks157k at acme.softbase.org
Fri Jul 17 16:58:23 EDT 2009

Am Montag, 16. Februar 2009 15:27 schrieben Sie:
> On Mon, 16 Feb 2009, Wolfgang Jeltsch wrote:
> > [redirecting to haskell-cafe]
> >
> > Am Sonntag, 15. Februar 2009 00:25 schrieben Sie:
> >> Hi Wolfgang,
> >>
> >> I was wondering if I can use FLTK as GUI backend for Grapefruit?
> >
> > This should be possible in principal. It just could be that my
> > assumptions about how widgets are created and composed were too tight so
> > that Grapefruit’s general interface doesn’t fit FLTK. In this case,
> > please just tell me and I will try to make the interface more general.
> Ok, great I ll have to use them then I will see and know what improvement
> is needed.
> >> I believe for this to make it happen, I would have to output FLTK's C++
> >> into C then create bindings for Haskell (via FFI).  Is that doable or an
> >> quite tall order?
> >
> > Recently, a student of mine has written a program which generates a
> > Haskell Qt binding fully automatically from Qt header files. The
> > generated binding consists of three layers. The first layer is C++ code
> > which reexports Qt’s functionality as a pure C interface. The C interface
> > is ugly for humans and not type safe (because C doesn’t know classes).
> > The second layer consists of a couple of FFI declarations. The third
> > layer is Haskell code which provides a nice interface similar to the
> > original C++ interface.
> >
> > I still have to get the source code of the binding generator from that
> > student but I hope this will happen soon. I want to publish it then on
> > the web. It hope that it is possible to reuse this binding generator for
> > other C++ libraries.
> That would be very helpful, I ll be looking forward.

Hello Jamie,

it’s been quite some time that we had this discussion about writing a 
FLTK-based GUI backend for Grapefruit. I’m sorry that I have to tell you that 
the above-mentioned student never managed to send me a final version of this 
Qt binding generator. At least, I was able to make him send me the current 
state of his code. I don’t think he will improve this code anymore.

If you want to have a look at the code, please visit


and follow the link to the code and have a look at the building tips. In case 
you would like to improve the binding generator, I’d be happy to receive 
patches. :-) 

Best wishes,

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