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{-# OPTIONS_GHC -fglasgow-exts #-} -- For deriving Data/Typeable
{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses, PatternGuards #-}
-----------------------------------------------------------------------------
-- |
-- Module : XMonad.Layout.ToggleLayouts
-- Copyright : (c) David Roundy <droundy@darcs.net>
-- License : BSD
--
-- Maintainer : David Roundy <droundy@darcs.net>
-- Stability : unstable
-- Portability : portable
--
-- A module to toggle between two layouts.
-----------------------------------------------------------------------------
module XMonad.Layout.ToggleLayouts (
-- * Usage
-- $usage
toggleLayouts, ToggleLayout(..)
) where
import XMonad
import XMonad.StackSet (Workspace (..))
-- $usage
-- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:
--
-- > import XMonad.Layout.ToggleLayouts
--
-- Then edit your @layoutHook@ by adding the ToggleLayouts layout:
--
-- > myLayouts = toggleLayouts Full (Tall 1 (3/100) (1/2)) ||| etc..
-- > main = xmonad defaultConfig { layoutHook = myLayouts }
--
-- For more detailed instructions on editing the layoutHook see:
--
-- "XMonad.Doc.Extending#Editing_the_layout_hook"
--
-- To toggle between layouts add a key binding like
--
-- > , ((modMask x .|. controlMask, xK_space), sendMessage ToggleLayout)
--
-- or a key binding like
--
-- > , ((modMask x .|. controlMask, xK_space), sendMessage (Toggle "Full"))
--
-- For detailed instruction on editing the key binding see:
--
-- "XMonad.Doc.Extending#Editing_key_bindings".
data ToggleLayouts lt lf a = ToggleLayouts Bool (lt a) (lf a) deriving (Read,Show)
data ToggleLayout = ToggleLayout | Toggle String deriving (Read,Show,Typeable)
instance Message ToggleLayout
toggleLayouts :: (LayoutClass lt a, LayoutClass lf a) => lt a -> lf a -> ToggleLayouts lt lf a
toggleLayouts = ToggleLayouts False
instance (LayoutClass lt a, LayoutClass lf a) => LayoutClass (ToggleLayouts lt lf) a where
runLayout (Workspace i (ToggleLayouts True lt lf) ms) r = do (ws,mlt') <- runLayout (Workspace i lt ms) r
return (ws,fmap (\lt' -> ToggleLayouts True lt' lf) mlt')
runLayout (Workspace i (ToggleLayouts False lt lf) ms) r = do (ws,mlf') <- runLayout (Workspace i lf ms) r
return (ws,fmap (\lf' -> ToggleLayouts False lt lf') mlf')
description (ToggleLayouts True lt _) = description lt
description (ToggleLayouts False _ lf) = description lf
handleMessage (ToggleLayouts bool lt lf) m
| Just ReleaseResources <- fromMessage m =
do mlf' <- handleMessage lf m
mlt' <- handleMessage lt m
return $ case (mlt',mlf') of
(Nothing ,Nothing ) -> Nothing
(Just lt',Nothing ) -> Just $ ToggleLayouts bool lt' lf
(Nothing ,Just lf') -> Just $ ToggleLayouts bool lt lf'
(Just lt',Just lf') -> Just $ ToggleLayouts bool lt' lf'
handleMessage (ToggleLayouts True lt lf) m
| Just ToggleLayout <- fromMessage m = do mlt' <- handleMessage lt (SomeMessage Hide)
let lt' = maybe lt id mlt'
return $ Just $ ToggleLayouts False lt' lf
| Just (Toggle d) <- fromMessage m,
d == description lt || d == description lf =
do mlt' <- handleMessage lt (SomeMessage Hide)
let lt' = maybe lt id mlt'
return $ Just $ ToggleLayouts False lt' lf
| otherwise = do mlt' <- handleMessage lt m
return $ fmap (\lt' -> ToggleLayouts True lt' lf) mlt'
handleMessage (ToggleLayouts False lt lf) m
| Just ToggleLayout <- fromMessage m = do mlf' <- handleMessage lf (SomeMessage Hide)
let lf' = maybe lf id mlf'
return $ Just $ ToggleLayouts True lt lf'
| Just (Toggle d) <- fromMessage m,
d == description lt || d == description lf =
do mlf' <- handleMessage lf (SomeMessage Hide)
let lf' = maybe lf id mlf'
return $ Just $ ToggleLayouts True lt lf'
| otherwise = do mlf' <- handleMessage lf m
return $ fmap (\lf' -> ToggleLayouts False lt lf') mlf'
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