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------------------------------------------------------------------------------
--- |
--- Module : Wm.hs
--- Copyright : (c) Spencer Janssen 2007
--- License : BSD3-style (see LICENSE)
---
--- Maintainer : sjanssen@cse.unl.edu
--- Stability : unstable
--- Portability : not portable, uses cunning newtype deriving
---
------------------------------------------------------------------------------
---
--- The Wm monad, a state monad transformer over IO, for the window manager state.
---
-
-module Wm where
-
-import Data.Sequence
-import Control.Monad.State
-import System.IO (hFlush, hPutStrLn, stderr)
-import Graphics.X11.Xlib
-
-data WmState = WmState
- { display :: Display
- , screenWidth :: !Int
- , screenHeight :: !Int
- , windows :: Seq Window
- }
-
-newtype Wm a = Wm (StateT WmState IO a)
- deriving (Monad, MonadIO{-, MonadState WmState-})
-
-runWm :: Wm a -> WmState -> IO (a, WmState)
-runWm (Wm m) = runStateT m
-
---
--- | Lift an IO action into the Wm monad
---
-io :: IO a -> Wm a
-io = liftIO
-
---
--- | Lift an IO action into the Wm monad, discarding any result
---
-io_ :: IO a -> Wm ()
-io_ f = liftIO f >> return ()
-
-trace msg = io $ do
- hPutStrLn stderr msg
- hFlush stderr
-
-withIO :: (forall b. (a -> IO b) -> IO b) -> (a -> Wm c) -> Wm c
-withIO f g = do
- s <- Wm get
- (y, s') <- io $ f $ \x -> runWm (g x) s
- Wm (put s')
- return y
-
-getDisplay = Wm (gets display)
-
-getWindows = Wm (gets windows)
-
-getScreenWidth = Wm (gets screenWidth)
-
-getScreenHeight = Wm (gets screenHeight)
-
-setWindows x = Wm (modify (\s -> s {windows = x}))
-
-modifyWindows :: (Seq Window -> Seq Window) -> Wm ()
-modifyWindows f = Wm (modify (\s -> s {windows = f (windows s)}))