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|
{-# OPTIONS -fallow-undecidable-instances #-}
-----------------------------------------------------------------------------
-- |
-- Module : XMonadContrib.LayoutHelpers
-- Copyright : (c) David Roundy <droundy@darcs.net>
-- License : BSD
--
-- Maintainer : David Roundy <droundy@darcs.net>
-- Stability : unstable
-- Portability : portable
--
-- A module for writing easy Layouts
-----------------------------------------------------------------------------
module XMonadContrib.LayoutHelpers (
-- * Usage
-- $usage
LayoutModifier(..)
) where
import Control.Monad ( mplus )
import Graphics.X11.Xlib ( Rectangle )
import XMonad
import StackSet ( Stack )
-- $usage
-- Use LayoutHelpers to help write easy Layouts.
class (Show (m l a), Read (m l a), Layout l a) => LayoutModifier m l a where
extractLayout :: m l a -> l a
wrapLayout :: m l a -> l a -> m l a
modifyModify :: m l a -> SomeMessage -> X (Maybe (l a -> m l a))
modifyModify _ _ = return Nothing
redoLayout :: m l a -> Rectangle -> Stack a -> [(a, Rectangle)]
-> X ([(a, Rectangle)], Maybe (l a -> m l a))
redoLayout _ _ _ wrs = return (wrs, Nothing)
instance LayoutModifier m l a => Layout (m l) a where
doLayout m r s = do (ws, ml') <- doLayout (extractLayout m) r s
(ws', mmod') <- redoLayout m r s ws
let ml'' = case mmod' of
Just mod' -> Just $ mod' $ maybe (extractLayout m) id ml'
Nothing -> wrapLayout m `fmap` ml'
return (ws', ml'')
modifyLayout m mess = do ml' <- modifyLayout (extractLayout m) mess
mmod' <- modifyModify m mess
return $ case mmod' of
Just mod' -> Just $ mod' $ maybe (extractLayout m) id ml'
Nothing -> wrapLayout m `fmap` ml'
|
