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|
{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses #-}
-----------------------------------------------------------------------------
-- |
-- Module : XMonad.Layout.ThreeColumns
-- Copyright : (c) Kai Grossjohann <kai@emptydomain.de>
-- License : BSD3-style (see LICENSE)
--
-- Maintainer : ?
-- Stability : unstable
-- Portability : unportable
--
-- A layout similar to tall but with three columns. With 2560x1600 pixels this
-- layout can be used for a huge main window and up to six reasonable sized
-- slave windows.
-----------------------------------------------------------------------------
module XMonad.Layout.ThreeColumns (
-- * Usage
-- $usage
-- * Screenshots
-- $screenshot
ThreeCol(..)
) where
import XMonad
import qualified XMonad.StackSet as W
import Data.Ratio
import Control.Monad
-- $usage
-- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:
--
-- > import XMonad.Layout.ThreeColumns
--
-- Then edit your @layoutHook@ by adding the ThreeCol layout:
--
-- > myLayout = ThreeCol 1 (3/100) (1/2) ||| ThreeColMid 1 (3/100) (1/2) ||| etc..
-- > main = xmonad def { layoutHook = myLayout }
--
-- The first argument specifies how many windows initially appear in the main
-- window. The second argument argument specifies the amount to resize while
-- resizing and the third argument specifies the initial size of the columns.
-- A positive size designates the fraction of the screen that the main window
-- should occupy, but if the size is negative the absolute value designates the
-- fraction a slave column should occupy. If both slave columns are visible,
-- they always occupy the same amount of space.
--
-- The ThreeColMid variant places the main window between the slave columns.
--
-- For more detailed instructions on editing the layoutHook see:
--
-- "XMonad.Doc.Extending#Editing_the_layout_hook"
-- $screenshot
-- <<http://server.c-otto.de/xmonad/ThreeColumnsMiddle.png>>
-- | Arguments are nmaster, delta, fraction
data ThreeCol a = ThreeColMid { threeColNMaster :: !Int, threeColDelta :: !Rational, threeColFrac :: !Rational}
| ThreeCol { threeColNMaster :: !Int, threeColDelta :: !Rational, threeColFrac :: !Rational}
deriving (Show,Read)
instance LayoutClass ThreeCol a where
pureLayout (ThreeCol n _ f) r = doL False n f r
pureLayout (ThreeColMid n _ f) r = doL True n f r
handleMessage l m =
return $ msum [fmap resize (fromMessage m)
,fmap incmastern (fromMessage m)]
where resize Shrink = l { threeColFrac = max (-0.5) $ f-d }
resize Expand = l { threeColFrac = min 1 $ f+d }
incmastern (IncMasterN x) = l { threeColNMaster = max 0 (n+x) }
n = threeColNMaster l
d = threeColDelta l
f = threeColFrac l
description _ = "ThreeCol"
doL :: Bool-> Int-> Rational-> Rectangle-> W.Stack a-> [(a, Rectangle)]
doL m n f r = ap zip (tile3 m f r n . length) . W.integrate
-- | tile3. Compute window positions using 3 panes
tile3 :: Bool -> Rational -> Rectangle -> Int -> Int -> [Rectangle]
tile3 middle f r nmaster n
| n <= nmaster || nmaster == 0 = splitVertically n r
| n <= nmaster+1 = splitVertically nmaster s1 ++ splitVertically (n-nmaster) s2
| otherwise = splitVertically nmaster r1 ++ splitVertically nslave1 r2 ++ splitVertically nslave2 r3
where (r1, r2, r3) = split3HorizontallyBy middle (if f<0 then 1+2*f else f) r
(s1, s2) = splitHorizontallyBy (if f<0 then 1+f else f) r
nslave = (n - nmaster)
nslave1 = ceiling (nslave % 2)
nslave2 = (n - nmaster - nslave1)
split3HorizontallyBy :: Bool -> Rational -> Rectangle -> (Rectangle, Rectangle, Rectangle)
split3HorizontallyBy middle f (Rectangle sx sy sw sh) =
if middle
then ( Rectangle (sx + fromIntegral r3w) sy r1w sh
, Rectangle (sx + fromIntegral r3w + fromIntegral r1w) sy r2w sh
, Rectangle sx sy r3w sh )
else ( Rectangle sx sy r1w sh
, Rectangle (sx + fromIntegral r1w) sy r2w sh
, Rectangle (sx + fromIntegral r1w + fromIntegral r2w) sy r3w sh )
where r1w = ceiling $ fromIntegral sw * f
r2w = ceiling ( (sw - r1w) % 2 )
r3w = sw - r1w - r2w
|
