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|
{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses, TypeSynonymInstances, FlexibleContexts, PatternGuards #-}
-----------------------------------------------------------------------------
-- |
-- Module : XMonad.Layout.Master
-- Copyright : (c) Ismael Carnales, Lukas Mai
-- License : BSD-style (see LICENSE)
--
-- Maintainer : Ismael Carnales <icarnales@gmail.com>
-- Stability : unstable
-- Portability : unportable
--
-- Layout modfier that adds a master window to another layout.
-----------------------------------------------------------------------------
module XMonad.Layout.Master (
-- * Usage
-- $usage
mastered
) where
import XMonad
import qualified XMonad.StackSet as S
import XMonad.Layout.LayoutModifier
-- $usage
-- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:
--
-- > import XMonad.Layout.Master
--
-- Then edit your @layoutHook@ and add the Master modifier to the layout that
-- you prefer.
--
-- > mastered (1/100) (1/2) $ Grid
--
-- This will use the left half of your screen for a master window and let
-- Grid manage the right half.
--
-- For more detailed instructions on editing the layoutHook see
-- "XMonad.Doc.Extending#Editing_the_layout_hook".
--
-- Like 'XMonad.Layout.Tall', 'withMaster' supports the
-- 'XMonad.Layout.Shrink' and XMonad.Layout.Expand' messages.
-- | Data type for LayoutModifier which converts given layout to a mastered
-- layout
data AddMaster a = AddMaster Rational Rational deriving (Show, Read)
-- | Modifier wich converts given layout to a mastered one
mastered :: (LayoutClass l a) =>
Rational -- ^ @delta@, the ratio of the screen to resize by
-> Rational -- ^ @frac@, what portion of the screen to use for the master window
-> l a -- ^ the layout to be modified
-> ModifiedLayout AddMaster l a
mastered delta frac = ModifiedLayout $ AddMaster delta frac
instance LayoutModifier AddMaster Window where
modifyLayout (AddMaster delta frac) = applyMaster delta frac
modifierDescription _ = "Mastered"
pureMess (AddMaster delta frac) m
| Just Shrink <- fromMessage m = Just $ AddMaster delta (frac-delta)
| Just Expand <- fromMessage m = Just $ AddMaster delta (frac+delta)
pureMess _ _ = Nothing
-- | Internal function for adding a master window and let the modified
-- layout handle the rest of the windows
applyMaster :: (LayoutClass l Window) =>
Rational
-> Rational
-> S.Workspace WorkspaceId (l Window) Window
-> Rectangle
-> X ([(Window, Rectangle)], Maybe (l Window))
applyMaster _ frac wksp rect = do
let st= S.stack wksp
let ws = S.integrate' $ st
if length ws > 2 then do
let m = head ws
let (mr, sr) = splitHorizontallyBy frac rect
let nst = st>>= S.filter (m/=)
wrs <- runLayout (wksp {S.stack = nst}) sr
return ((m, mr) : fst wrs, snd wrs)
else runLayout wksp rect
|
