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|
{-# LANGUAGE TypeSynonymInstances, MultiParamTypeClasses #-}
-----------------------------------------------------------------------------
-- |
-- Module : XMonad.Layout.HintedGrid
-- Copyright : (c) Lukas Mai
-- License : BSD-style (see LICENSE)
--
-- Maintainer : <l.mai@web.de>
-- Stability : unstable
-- Portability : unportable
--
-- A not so simple layout that attempts to put all windows in a square grid
-- while obeying their size hints.
--
-----------------------------------------------------------------------------
module XMonad.Layout.HintedGrid (
-- * Usage
-- $usage
Grid(..), arrange
) where
import Prelude hiding ((.))
import XMonad hiding (windows)
import XMonad.StackSet
import Control.Monad.State
infixr 9 .
(.) :: (Functor f) => (a -> b) -> f a -> f b
(.) = fmap
-- $usage
-- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:
--
-- > import XMonad.Layout.HintedGrid
--
-- Then edit your @layoutHook@ by adding the 'Grid' layout:
--
-- > myLayouts = Grid False ||| Full ||| etc..
-- > main = xmonad defaultConfig { layoutHook = myLayouts }
--
-- For more detailed instructions on editing the layoutHook see
-- "XMonad.Doc.Extending#Editing_the_layout_hook".
-- | Automatic mirroring of hinted layouts doesn't work very well, so this
-- 'Grid' comes with built-in mirroring. @Grid False@ is the normal layout,
-- @Grid True@ is the mirrored variant (rotated by 90 degrees).
data Grid a = Grid Bool deriving (Read, Show)
instance LayoutClass Grid Window where
doLayout (Grid m) r w = flip (,) Nothing . arrange m r (integrate w)
adjBorders :: Dimension -> D -> D
adjBorders b (w, h) = (w + 2 * b, h + 2 * b)
isqrt :: (Integral a) => a -> a
isqrt = ceiling . (sqrt :: Double -> Double) . fromIntegral
replicateS :: Int -> (a -> (b, a)) -> a -> ([b], a)
replicateS n = runState . replicateM n . State
doColumn :: Dimension -> Dimension -> Dimension -> [(D -> D)] -> [D]
doColumn width = doC
where
doC _ _ [] = []
doC height n (f : fs) = adj : doC (height - h') (n - 1) fs
where
adj@(_, h') = f (width, height `div` n)
doRect :: Dimension -> Dimension -> Dimension -> [[D -> D]] -> [Rectangle]
doRect height = doR
where
doR _ _ [] = []
doR width n (c : cs) =
let
v = fromIntegral $ length c
c' = doColumn (width `div` n) height v c
(ws, hs) = unzip c'
maxw = maximum ws
height' = sum hs
hbonus = height - height'
hsingle = hbonus `div` v
hoffset = hsingle `div` 2
width' = width - maxw
ys = map ((height -) . subtract hoffset) . scanl1 (+) . map (hsingle +) $ hs
xs = map ((width' +) . (`div` 2) . (maxw -)) $ ws
in
zipWith3 (\x y (w, h) -> Rectangle (fromIntegral x) (fromIntegral y) w h) xs ys c' ++ doR width' (n - 1) cs
-- | The internal function for computing the grid layout.
arrange :: Bool -> Rectangle -> [Window] -> X [(Window, Rectangle)]
arrange mirror (Rectangle rx ry rw rh) windows = do
dpy <- asks display
hints <- mapM (io . getWMNormalHints dpy) windows
borders <- mapM (io . fmap (fromIntegral . wa_border_width) . getWindowAttributes dpy) windows
let
adjs = zipWith (\h b -> twist . adjBorders b . applySizeHints h . adjBorders (negate b) . twist) hints borders
rs = arrange' (twist (rw, rh)) adjs
rs' = map (\(Rectangle x y w h) -> uncurry (uncurry Rectangle (twist (x, y))) (twist (w, h))) rs
return . zip windows . map (\r -> r{ rect_x = rect_x r + rx, rect_y = rect_y r + ry }) $ rs'
where
twist
| mirror = \(a, b) -> (b, a)
| otherwise = id
arrange' :: D -> [D -> D] -> [Rectangle]
arrange' (rw, rh) adjs = reverse $ doRect rh rw (fromIntegral ncolumns) (ecols ++ cols)
where
nwindows = length adjs
ncolumns = isqrt nwindows
nrows = nwindows `div` ncolumns
nextras = nwindows - ncolumns * nrows
(ecols, adjs') = replicateS nextras (splitAt (nrows + 1)) $ reverse adjs
(cols, _) = replicateS (ncolumns - nextras) (splitAt nrows) adjs'
|
