A design for a GUI library which is more like Haskell and less like C. To be written over Gtk2Hs.
1 Thoughts by
Neil Mitchell, some patches from Joachim Breitner, discussions and help from Duncan Coutts
For a darcs repo see: http://www.cs.york.ac.uk/fp/darcs/proplang/
In particular check out Sample.hs, I am particularly proud of the word count:
sb!text =< with1 (txt!text) (\x -> "Word count: " ++ show (length $ words x))
There are events, you can register to be notified when an event fires by doing
event += handler
There are variables, which have events which fire, and a value which you can set and get.
variable <- newVar "value" variable += handler variable -< "value" x <- getVal variable
There are objects, objects have properties. A property is just a variable.
window!text += handler window!text -< "Titlebar text"
There are bindings which relate variables.
-- the window text is the variable window!text =<= variable -- the window text is the variable, but upppercase window!text =< with1 variable (map toUpper) -- combine the two texts to create the window text window!text =< with2 variable1 variable2 (++)
If any of the values on the RHS of a binding change, then the LHS is updated.