35 lines
1.2 KiB
Haskell
35 lines
1.2 KiB
Haskell
{-# LANGUAGE MultiParamTypeClasses #-}
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{-# LANGUAGE FlexibleContexts #-}
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{-# LANGUAGE ScopedTypeVariables #-}
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{-# LANGUAGE TypeFamilies #-}
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module Affection.Subsystems.AffectionKeyboard where
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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
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-- 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
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-> [SDL.EventPayload] -- ^ Incoming events
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-> Affection us [SDL.EventPayload] -- ^ Leftover SDL Events
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consumeSDLKeyboardEvents ak = doConsume
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where
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doConsume [] = return []
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doConsume (e:es) = do
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ts <- getElapsedTime
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case e of
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SDL.KeyboardEvent dat -> do
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partEmit ak (MsgKeyboardEvent
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ts
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(SDL.keyboardEventWindow dat)
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(SDL.keyboardEventKeyMotion dat)
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(SDL.keyboardEventRepeat dat)
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(SDL.keyboardEventKeysym dat)
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)
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doConsume es
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_ -> fmap (e :) (doConsume es)
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