Created
February 9, 2016 17:23
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module Counter where | |
import Prelude (Unit(), pure, unit, ($), bind, show, void, (++), (+), (*), (<$>), const, negate, id) | |
import Data.Functor ((<$)) | |
import Control.Monad.Aff (Aff(), runAff) | |
import Control.Monad.Eff (Eff()) | |
import Control.Monad.Eff.Exception (throwException) | |
import Control.Monad.Eff.Class (liftEff) | |
import Halogen (HalogenEffects(), ComponentDSL(), Natural(), ComponentHTML(), Component(), action, runUI, component, set) | |
import Halogen.Util (appendToBody, onLoad) | |
import Halogen.HTML.Indexed (text) | |
import Signal ((<~), (~>), runSignal, foldp, sampleOn, filter ) | |
import Signal.DOM (CoordinatePair(), mousePos, mouseButton ) | |
import Signal.Time (second, every, now) | |
type State = Int | |
data Query a = SetState State a | |
type Effects = HalogenEffects () | |
ui :: Component State Query (Aff Effects) | |
ui = component render eval | |
where | |
render :: State -> ComponentHTML Query | |
render s = text (show s) | |
eval :: Natural Query (ComponentDSL State Query (Aff Effects)) | |
eval (SetState s next) = next <$ do | |
set s | |
main :: forall eff . Eff Effects Unit | |
main = runAff throwException pure $ void do | |
app <- runUI ui 0 | |
let update p = runAff throwException pure $ app.driver (action (SetState p)) | |
onLoad $ appendToBody app.node | |
liftEff do | |
let button index delta = do | |
button <- mouseButton index | |
pure $ (const delta <~ filter id true button) | |
plus <- button 0 1 | |
minus <- button 2 (negate 1) | |
runSignal $ update <~ foldp (+) 0 (plus ++ minus) | |
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