affection/src/Affection/Subsystems/AffectionKeyboard.hs

36 lines
1.2 KiB
Haskell

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