affection/src/Affection/Subsystems/AffectionMouse.hs

62 lines
2.0 KiB
Haskell

{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TypeFamilies #-}
module Affection.Subsystems.AffectionMouse where
import Affection.MessageBus
import Affection.Types
import Affection.Util
import Linear.Affine (unP)
import qualified SDL
-- | Helper funtion that consumes all Mouse-related 'SDL.Eventpayload's
-- and emits appropriate 'MouseMessage's
consumeSDLMouseEvents
:: forall am us. (Participant am us, Mesg am us ~ MouseMessage)
=> am -- ^ The message system participant
-> [SDL.EventPayload] -- ^ Incoming events
-> Affection us [SDL.EventPayload] -- ^ Leftover SDL events
consumeSDLMouseEvents am = doConsume
where
doConsume
:: [SDL.EventPayload]
-> Affection us [SDL.EventPayload]
doConsume [] = return []
doConsume (e:es) = do
ts <- getElapsedTime
case e of
SDL.MouseMotionEvent dat -> do
partEmit am (MsgMouseMotion
ts
(SDL.mouseMotionEventWindow dat)
(SDL.mouseMotionEventWhich dat)
(SDL.mouseMotionEventState dat)
(unP $ SDL.mouseMotionEventPos dat)
(SDL.mouseMotionEventRelMotion dat)
)
doConsume es
SDL.MouseButtonEvent dat -> do
partEmit am (MsgMouseButton
ts
(SDL.mouseButtonEventWindow dat)
(SDL.mouseButtonEventMotion dat)
(SDL.mouseButtonEventWhich dat)
(SDL.mouseButtonEventButton dat)
(SDL.mouseButtonEventClicks dat)
(unP $ SDL.mouseButtonEventPos dat)
)
doConsume es
SDL.MouseWheelEvent dat -> do
partEmit am (MsgMouseWheel
ts
(SDL.mouseWheelEventWindow dat)
(SDL.mouseWheelEventWhich dat)
(SDL.mouseWheelEventPos dat)
(SDL.mouseWheelEventDirection dat)
)
doConsume es
_ -> fmap (e :) (doConsume es)