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78 lines
2.9 KiB
Haskell
78 lines
2.9 KiB
Haskell
{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses #-}
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-----------------------------------------------------------------------------
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-- |
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-- Module : XMonad.Layout.ThreeColumns
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-- Copyright : (c) Kai Grossjohann <kai@emptydomain.de>
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-- License : BSD3-style (see LICENSE)
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--
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-- Maintainer : ?
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-- Stability : unstable
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-- Portability : unportable
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--
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-- A layout similar to tall but with three columns.
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--
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-----------------------------------------------------------------------------
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module XMonad.Layout.ThreeColumns (
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-- * Usage
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-- $usage
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ThreeCol(..)
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) where
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import XMonad
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import qualified XMonad.StackSet as W
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import Data.Ratio
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import Control.Monad
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-- $usage
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-- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:
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--
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-- > import XMonad.Layout.ThreeColumns
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--
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-- Then edit your @layoutHook@ by adding the ThreeCol layout:
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--
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-- > myLayouts = ThreeCol 1 (3/100) (1/2) ||| etc..
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-- > main = xmonad defaultConfig { layoutHook = myLayouts }
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--
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-- For more detailed instructions on editing the layoutHook see:
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--
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-- "XMonad.Doc.Extending#Editing_the_layout_hook"
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data ThreeCol a = ThreeCol !Int !Rational !Rational deriving (Show,Read)
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instance LayoutClass ThreeCol a where
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doLayout (ThreeCol nmaster _ frac) r =
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return . (\x->(x,Nothing)) .
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ap zip (tile3 frac r nmaster . length) . W.integrate
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handleMessage (ThreeCol nmaster delta frac) m =
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return $ msum [fmap resize (fromMessage m)
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,fmap incmastern (fromMessage m)]
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where resize Shrink = ThreeCol nmaster delta (max 0 $ frac-delta)
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resize Expand = ThreeCol nmaster delta (min 1 $ frac+delta)
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incmastern (IncMasterN d) = ThreeCol (max 0 (nmaster+d)) delta frac
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description _ = "ThreeCol"
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-- | tile3. Compute window positions using 3 panes
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tile3 :: Rational -> Rectangle -> Int -> Int -> [Rectangle]
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tile3 f r nmaster n
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| n <= nmaster || nmaster == 0 = splitVertically n r
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| n <= nmaster+1 = splitVertically nmaster s1 ++ splitVertically (n-nmaster) s2
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| otherwise = splitVertically nmaster r1 ++ splitVertically nmid r2 ++ splitVertically nright r3
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where (r1, r2, r3) = split3HorizontallyBy f r
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(s1, s2) = splitHorizontallyBy f r
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nslave = (n - nmaster)
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nmid = ceiling (nslave % 2)
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nright = (n - nmaster - nmid)
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split3HorizontallyBy :: Rational -> Rectangle -> (Rectangle, Rectangle, Rectangle)
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split3HorizontallyBy f (Rectangle sx sy sw sh) =
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( Rectangle sx sy leftw sh
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, Rectangle (sx + fromIntegral leftw) sy midw sh
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, Rectangle (sx + fromIntegral leftw + fromIntegral midw) sy rightw sh )
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where leftw = ceiling $ fromIntegral sw * (2/3) * f
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midw = ceiling ( (sw - leftw) % 2 )
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rightw = sw - leftw - midw
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