[Haskell] ANNOUNCE: Phooey -- a Functional UI library for Haskell
conal at conal.net
Tue Dec 12 02:17:46 EST 2006
Announcing Phooey <http://conal.net/phooey>, a functional UI library for
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
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
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
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
Distribution tarballs are
Comments and collaboration are very welcome!
P.S. I'm very grateful for Don Stewart's recent pointers on how to create &
release Haskell projects.
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