affection/src/Affection/Subsystems/AffectionWindow.hs

{-# LANGUAGE MultiParamTypeClasses #-}
module Affection.Subsystems.AffectionWindow where

import Affection.Types
import Affection.MessageBus
import Affection.Subsystems.Class

import Control.Concurrent.STM as STM
import Control.Monad.IO.Class (liftIO)

import qualified SDL

data AffectionWindow sd = AffectionWindow
  { windowSubscribers :: TVar [(UUID, WindowMessage -> Affection sd ())]
  }

instance Participant AffectionWindow WindowMessage where
  partSubscribe p funct = do
    uuid <- genUUID
    liftIO $ atomically $ modifyTVar' (windowSubscribers p) ((uuid, funct) :)
    return uuid

  partUnSubscribe p uuid =
    liftIO $ atomically $ modifyTVar' (windowSubscribers p)
      (filter (\(u, _) -> u /= uuid))

  partSubscribers p = do
    subTups <- liftIO $ readTVarIO $ windowSubscribers p
    return $ map snd subTups

instance SDLSubsystem AffectionWindow WindowMessage where
  consumeSDLEvents aw evs = doConsume evs
    where
      doConsume [] = return []
      doConsume (e:es) = case SDL.eventPayload e of
        SDL.WindowShownEvent (SDL.WindowShownEventData window) -> do
          partEmit aw (MsgWindowShow (SDL.eventTimestamp e) window)
          doConsume es
        SDL.WindowHiddenEvent (SDL.WindowHiddenEventData window) -> do
          partEmit aw (MsgWindowHide (SDL.eventTimestamp e) window)
          doConsume es
        SDL.WindowExposedEvent (SDL.WindowExposedEventData window) -> do
          partEmit aw (MsgWindowExpose (SDL.eventTimestamp e) window)
          doConsume es
        SDL.WindowMovedEvent (SDL.WindowMovedEventData window (SDL.P newPos)) -> do
          partEmit aw (MsgWindowMove (SDL.eventTimestamp e) window newPos)
          doConsume es
        SDL.WindowResizedEvent (SDL.WindowResizedEventData window newSize) -> do
          partEmit aw (MsgWindowResize (SDL.eventTimestamp e) window newSize)
          doConsume es
        SDL.WindowSizeChangedEvent (SDL.WindowSizeChangedEventData window) -> do
          partEmit aw (MsgWindowSizeChange (SDL.eventTimestamp e) window)
          doConsume es
        SDL.WindowMinimizedEvent (SDL.WindowMinimizedEventData window) -> do
          partEmit aw (MsgWindowMinimize (SDL.eventTimestamp e) window)
          doConsume es
        SDL.WindowMaximizedEvent (SDL.WindowMaximizedEventData window) -> do
          partEmit aw (MsgWindowMaximize (SDL.eventTimestamp e) window)
          doConsume es
        SDL.WindowRestoredEvent (SDL.WindowRestoredEventData window) -> do
          partEmit aw (MsgWindowRestore (SDL.eventTimestamp e) window)
          doConsume es
        SDL.WindowGainedMouseFocusEvent (SDL.WindowGainedMouseFocusEventData window) -> do
          partEmit aw (MsgWindowGainMouseFocus (SDL.eventTimestamp e) window)
          doConsume es
        SDL.WindowLostMouseFocusEvent (SDL.WindowLostMouseFocusEventData window) -> do
          partEmit aw (MsgWindowLoseMouseFocus (SDL.eventTimestamp e) window)
          doConsume es
        SDL.WindowGainedKeyboardFocusEvent (SDL.WindowGainedKeyboardFocusEventData window) -> do
          partEmit aw (MsgWindowGainKeyboardFocus (SDL.eventTimestamp e) window)
          doConsume es
        SDL.WindowLostKeyboardFocusEvent (SDL.WindowLostKeyboardFocusEventData window) -> do
          partEmit aw (MsgWindowLoseKeyboardFocus (SDL.eventTimestamp e) window)
          doConsume es
        SDL.WindowClosedEvent (SDL.WindowClosedEventData window) -> do
          partEmit aw (MsgWindowClose (SDL.eventTimestamp e) window)
          doConsume es
        _ -> fmap (e :) (doConsume es)