update screenmode toggle function

examples/example01/Main.hs

@@ -103,7 +103,7 @@ pre ud = do
 
 toggleFullScreen :: KeyboardMessage -> Affection ()
 toggleFullScreen (MsgKeyboardEvent _ _ SDL.Pressed False sym)
-  | SDL.keysymKeycode sym == SDL.KeycodeF11 = toggleScreen
+  | SDL.keysymKeycode sym == SDL.KeycodeF11 = toggleScreen 0
   | otherwise = return ()
 toggleFullScreen _ = return ()
 

src/Affection/Util.hs

@@ -11,6 +11,7 @@ import qualified Graphics.Rendering.OpenGL as GL
 import System.Clock
 
 import Data.String (fromString)
+import Data.List (find)
 
 import Control.Monad.State
 
@@ -35,24 +36,35 @@ getDelta = gets deltaTime
 
 -- | Toggle the Screen mode between 'SDL.Windowed' and 'SDL.FullscreenDesktop'.
 -- Pauses the Engine in the process.
-toggleScreen :: Affection ()
-toggleScreen = do
+toggleScreen :: Word -> Affection ()
+toggleScreen windowIdent = do
   ad <- get
-  newMode <- case screenMode ad of
-    SDL.Windowed -> do
-      mapM_ (flip SDL.setWindowMode SDL.FullscreenDesktop . (\(_,y,_) -> y)) (drawWindows ad)
-      return SDL.FullscreenDesktop
-    SDL.FullscreenDesktop -> do
-      mapM_ (flip SDL.setWindowMode SDL.Windowed . (\(_,y,_) -> y)) (drawWindows ad)
-      return SDL.Windowed
-    x -> do
-      liftIO $ logIO Warn ("Unexpected Screen mode: " <> fromString (show x))
-      return x
-  now <- liftIO $ getTime Monotonic
-  put ad
-    { sysTime = now
-    , screenMode = newMode
-    }
+  let mwindow = find (\(ident, _, _) -> ident == windowIdent) (drawWindows ad)
+  case mwindow of
+    Just (ident, window, mode) -> do
+      newMode <- case mode of
+        SDL.FullscreenDesktop -> do
+          SDL.setWindowMode window SDL.Windowed
+          return SDL.Windowed
+        SDL.Windowed -> do
+          SDL.setWindowMode window SDL.FullscreenDesktop
+          return SDL.FullscreenDesktop
+        x -> do
+          liftIO $ logIO Warn ("Unexpected window mode: " <> fromString (show x))
+          return x
+      now <- liftIO $ getTime Monotonic
+      put ad
+        { sysTime = now
+        , drawWindows = map
+          (\e@(lid, win, mod) ->
+            if lid == ident
+            then (lid, win, newMode)
+            else e
+            )
+          (drawWindows ad)
+        }
+    Nothing -> do
+      liftIO $ logIO Warn ("No window found with ident " <> fromString (show windowIdent))
 
 -- | Fit the GL Viewport to Window size
 fitViewport