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|
{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses #-}
-----------------------------------------------------------------------------
-- |
-- Module : XMonad.Layout.Grid
-- Copyright : (c) Lukas Mai
-- License : BSD-style (see LICENSE)
--
-- Maintainer : <l.mai@web.de>
-- Stability : unstable
-- Portability : unportable
--
-- A simple layout that attempts to put all windows in a square grid.
--
-----------------------------------------------------------------------------
module XMonad.Layout.Grid (
-- * Usage
-- $usage
Grid(..), arrange, defaultRatio
) where
import XMonad
import XMonad.StackSet
-- $usage
-- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:
--
-- > import XMonad.Layout.Grid
--
-- Then edit your @layoutHook@ by adding the Grid layout:
--
-- > myLayout = Grid ||| Full ||| etc..
-- > main = xmonad def { layoutHook = myLayout }
--
-- You can also specify an aspect ratio for Grid to strive for with the
-- GridRatio constructor. For example, if you want Grid to try to make a grid
-- four windows wide and three windows tall, you could use
--
-- > myLayout = GridRatio (4/3) ||| etc.
--
-- For more detailed instructions on editing the layoutHook see:
--
-- "XMonad.Doc.Extending#Editing_the_layout_hook"
data Grid a = Grid | GridRatio Double deriving (Read, Show)
defaultRatio :: Double
defaultRatio = 16/9
instance LayoutClass Grid a where
pureLayout Grid r = pureLayout (GridRatio defaultRatio) r
pureLayout (GridRatio d) r = arrange d r . integrate
arrange :: Double -> Rectangle -> [a] -> [(a, Rectangle)]
arrange aspectRatio (Rectangle rx ry rw rh) st = zip st rectangles
where
nwins = length st
ncols = max 1 . round . sqrt $ fromIntegral nwins * fromIntegral rw / (fromIntegral rh * aspectRatio)
mincs = max 1 $ nwins `div` ncols
extrs = nwins - ncols * mincs
chop :: Int -> Dimension -> [(Position, Dimension)]
chop n m = ((0, m - k * fromIntegral (pred n)) :) . map (flip (,) k) . tail . reverse . take n . tail . iterate (subtract k') $ m'
where
k :: Dimension
k = m `div` fromIntegral n
m' = fromIntegral m
k' :: Position
k' = fromIntegral k
xcoords = chop ncols rw
ycoords = chop mincs rh
ycoords' = chop (succ mincs) rh
(xbase, xext) = splitAt (ncols - extrs) xcoords
rectangles = combine ycoords xbase ++ combine ycoords' xext
where
combine ys xs = [Rectangle (rx + x) (ry + y) w h | (x, w) <- xs, (y, h) <- ys]
|
