affection/src/Affection/Subsystems/AffectionKeyboard.hs

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{-# LANGUAGE MultiParamTypeClasses #-}
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{-# LANGUAGE FlexibleContexts #-}
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{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TypeFamilies #-}
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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
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import qualified SDL
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-- | Helper function that consumes all Keyboard-related 'SDL.EventPayload's
-- and emits appropriate 'KeyboardMessage's
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consumeSDLKeyboardEvents
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:: forall ak us. (Participant ak us, Mesg ak us ~ KeyboardMessage)
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=> ak -- ^ The message system participant
-> [SDL.EventPayload] -- ^ Incoming events
-> Affection us [SDL.EventPayload] -- ^ Leftover SDL Events
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consumeSDLKeyboardEvents ak = doConsume
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where
doConsume [] = return []
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)