affection/src/Affection/Subsystems/AffectionKeyboard.hs

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{-# LANGUAGE MultiParamTypeClasses #-}
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{-# LANGUAGE RankNTypes #-}
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module Affection.Subsystems.AffectionKeyboard where
import Affection.Types
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import Affection.Util
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import Affection.MessageBus
import Affection.Subsystems.Class
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import Control.Concurrent.STM as STM
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import Control.Monad.IO.Class (liftIO)
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import qualified SDL
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data AffectionKeyboard us = AffectionKeyboard
{ keyboardSubscribers :: forall us. TVar [(UUID, KeyboardMessage -> Affection us ())]
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}
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instance Participant (AffectionKeyboard us) KeyboardMessage where
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partSubscribe p funct = do
uuid <- genUUID
liftIO $ atomically $ modifyTVar' (keyboardSubscribers p) ((uuid, funct) :)
return uuid
partUnSubscribe p uuid =
liftIO $ atomically $ modifyTVar' (keyboardSubscribers p)
(filter (\(u, _) -> u /= uuid))
partSubscribers p = do
subTups <- liftIO $ readTVarIO $ keyboardSubscribers p
return $ map snd subTups
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instance SDLSubsystem (AffectionKeyboard us) KeyboardMessage where
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consumeSDLEvents ak eps = doConsume eps
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where
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doConsume (e:es) = do
ts <- getElapsedTime
case e of
SDL.KeyboardEvent dat -> do
partEmit ak (MsgKeyboardEvent
ts
(SDL.keyboardEventWindow dat)
(SDL.keyboardEventKeyMotion dat)
(SDL.keyboardEventRepeat dat)
(SDL.keyboardEventKeysym dat)
)
doConsume es
_ -> fmap (e :) (doConsume es)