Hi Antony,
Phooey is much simpler and less ambitious than Yampa & Fruit. Semantically,
it's the same arrow, namely functions from input flows to output flows.
Internally, it does simple data-driven evaluation. No "events" &
"switching" in the FRP sense. I didn't try to address dynamic collections.
Pretty simple stuff.
As for non-rectilinear layout, I think I could wrap up Phooey-style anything
that the underlying library's layout mechanism provides. Layout in wxHaskell
is particularly nice to work with, as they're already functional.
The interest driving me to release & write up Phooey is as I mentioned in my
reply to Brian. I wanted to understand and clearly express a pathway of
transformation (refactoring) between the imperative style and a simple
functional style. That transformation is what the paper-in-progress is
about.
Regards, - Conal
On 12/12/06, Antony Courtney <[EMAIL PROTECTED]> wrote:
Hi Conal,
Looks like an interesting system.
A few questions:
- What is the underlying Arrow here, and how does it differ from
Yampa? (And the obvious follow-on: If they are similar, why not just use
Yampa?)
- How will your layout model deal with layouts that aren't rectilinear?
- Do you support events or switching (in the FRP sense)?
- How do you plan to deal with dynamic collections (opening/closing
new windows at runtime, or adding/removing widgets from a running
GUI)? IMO, this is the biggest challenge to presenting a purely
functional API but using a standard GUI toolkit for the underlying widget
set.
Regards,
-Antony
On 12/12/06, Conal Elliott <[EMAIL PROTECTED]> wrote:
> Announcing Phooey <http://conal.net/phooey>, a functional UI library for
> Haskell.
>
> GUIs are usually programmed in an "unnatural" style, in that
> implementation dependencies are inverted, relative to logical dependencies.
> This reversal results directly from the imperative orientation of most GUI
> libraries. While outputs depend on inputs from a user and semantic point of
> view, the imperative approach imposes an implementation dependence of inputs
> on outputs.
>
> Phooey ("*Ph*unctional *oo*s*e*r *y*nterfaces") retains the functional
> style, in which outputs are expressed in terms of inputs. In addition,
> Phooey supports dynamic input bounds, flexible layout, and
> mutually-referential widgets.
>
> As an example of Phooey's style, below is a simple shopping list GUI.
> The *total* displayed at the bottom of the window always shows the sum
> of the values of the *apples* and *bananas* input sliders. When a user
> changes the inputs, the output updates accordingly.
>
>
> Phooey is structured as an arrow, and this example uses arrow notation.
> The code:
>
> ui1 :: UI () ()
> ui1 = title "Shopping List" $
>
> proc () -> do
> a <- title "apples" (islider 3) -< (0,10)
> b <- title "bananas" (islider 7) -< (0,10)
>
> title "total" showDisplay -< a+b
>
>
> I am working on a paper about Phooey. For now, please see the Haddock
> documentation <http://darcs.haskell.org/packages/phooey/doc> (which
> includes more examples), and try the code via
>
> darcs get http://darcs.haskell.org/packages/phooey --partial
>
>
> Directions for building are in the
README<http://darcs.haskell.org/packages/phooey/README>file. Distribution tarballs
are
> here <http://darcs.haskell.org/packages/phooey/dist>.
>
> Comments and collaboration are very welcome!
>
> Cheers,
>
> - Conal
>
> P.S. I'm very grateful for Don Stewart's recent pointers on how to
> create & release Haskell projects.
>
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>
>
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