?? mainhello1.hs
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-- --------------------------------------------------------------------------- $Source: /repository/uni/htk/examples/simple/Mainhello1.hs,v $---- HTk - a GUI toolkit for Haskell - (c) Universitaet Bremen---- $Revision: 1.1 $ from $Date: 2002/02/25 21:50:57 $ -- Last modification by $Author: cxl $---- -----------------------------------------------------------------------module Main (main) whereimport HTkimport Random(randomRIO)randomColour :: IO (Int, Int, Int)randomColour = do red <-randomRIO(0,255) green<-randomRIO(0,255) blue <-randomRIO(0,255) return (red, green, blue) main:: IO ()main = do main <- initHTk [] Icon main # bitmap info l <- newLabel main [height 5, text "Hello, world!"] pack l [] nb <- newButton main [text "New Colour"] pack nb [] clickednb <- clicked nb spawnEvent (forever (clickednb >>> do bunt <- randomColour l # foreground bunt)) finishHTk
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