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E.Z. Yang's PerScreen xmonad layout modifier for choosing layouts dynamically based on screen width.Source: http://blog.ezyang.com/2015/05/width-adaptive-xmonad-layout/
{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses #-}
-----------------------------------------------------------------------------
-- |
-- Module : XMonad.Layout.PerScreen
-- Copyright : (c) Edward Z. Yang
-- License : BSD-style (see LICENSE)
--
-- Maintainer : <ezyang@cs.stanford.edu>
-- Stability : unstable
-- Portability : unportable
--
-- Configure layouts based on the width of your screen; use your
-- favorite multi-column layout for wide screens and a full-screen
-- layout for small ones.
-----------------------------------------------------------------------------
module XMonad.Layout.PerScreen
( -- * Usage
-- $usage
PerScreen,
ifWider
) where
import XMonad
import qualified XMonad.StackSet as W
import Data.Maybe (fromMaybe)
-- $usage
-- You can use this module by importing it into your ~\/.xmonad\/xmonad.hs file:
--
-- > import XMonad.Layout.PerScreen
--
-- and modifying your layoutHook as follows (for example):
--
-- > layoutHook = ifWider 1280 (Tall 1 (3/100) (1/2) ||| Full) Full
--
-- Replace any of the layouts with any arbitrarily complicated layout.
-- ifWider can also be used inside other layout combinators.
ifWider :: (LayoutClass l1 a, LayoutClass l2 a)
=> Dimension -- ^ target screen width
-> (l1 a) -- ^ layout to use when the screen is wide enough
-> (l2 a) -- ^ layout to use otherwise
-> PerScreen l1 l2 a
ifWider w = PerScreen w False
data PerScreen l1 l2 a = PerScreen Dimension Bool (l1 a) (l2 a) deriving (Read, Show)
-- | Construct new PerScreen values with possibly modified layouts.
mkNewPerScreenT :: PerScreen l1 l2 a -> Maybe (l1 a) ->
PerScreen l1 l2 a
mkNewPerScreenT (PerScreen w _ lt lf) mlt' =
(\lt' -> PerScreen w True lt' lf) $ fromMaybe lt mlt'
mkNewPerScreenF :: PerScreen l1 l2 a -> Maybe (l2 a) ->
PerScreen l1 l2 a
mkNewPerScreenF (PerScreen w _ lt lf) mlf' =
(\lf' -> PerScreen w False lt lf') $ fromMaybe lf mlf'
instance (LayoutClass l1 a, LayoutClass l2 a, Show a) => LayoutClass (PerScreen l1 l2) a where
runLayout (W.Workspace i p@(PerScreen w _ lt lf) ms) r
| rect_width r > w = do (wrs, mlt') <- runLayout (W.Workspace i lt ms) r
return (wrs, Just $ mkNewPerScreenT p mlt')
| otherwise = do (wrs, mlt') <- runLayout (W.Workspace i lf ms) r
return (wrs, Just $ mkNewPerScreenF p mlt')
handleMessage (PerScreen w bool lt lf) m
| bool = handleMessage lt m >>= maybe (return Nothing) (\nt -> return . Just $ PerScreen w bool nt lf)
| otherwise = handleMessage lf m >>= maybe (return Nothing) (\nf -> return . Just $ PerScreen w bool lt nf)
description (PerScreen _ True l1 _) = description l1
description (PerScreen _ _ _ l2) = description l2
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