affection/src/Affection/Subsystems/AffectionMouse.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.AffectionMouse where
import Affection.MessageBus
import Affection.Types
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import Affection.Util
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import Linear.Affine (unP)
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import qualified SDL
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-- | Helper funtion that consumes all Mouse-related 'SDL.Eventpayload's
-- and emits appropriate 'MouseMessage's
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consumeSDLMouseEvents
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:: forall am us. (Participant am us, Mesg am us ~ MouseMessage)
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=> am -- ^ The message system participant
-> [SDL.EventPayload] -- ^ Incoming events
-> Affection us [SDL.EventPayload] -- ^ Leftover SDL events
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consumeSDLMouseEvents am = doConsume
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where
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doConsume
:: [SDL.EventPayload]
-> Affection us [SDL.EventPayload]
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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)
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(SDL.mouseButtonEventMotion dat)
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(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)