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|
{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses, DeriveDataTypeable #-}
-----------------------------------------------------------------------------
-- |
-- Module : XMonad.Layout.Mosaic
-- Copyright : (c) 2009 Adam Vogt, 2007 James Webb
-- License : BSD-style (see xmonad/LICENSE)
--
-- Maintainer : vogt.adam<at>gmail.com
-- Stability : unstable
-- Portability : unportable
--
-- Based on MosaicAlt, but aspect ratio messages always change the aspect
-- ratios, and rearranging the window stack changes the window sizes.
--
-----------------------------------------------------------------------------
module XMonad.Layout.Mosaic (
-- * Usage
-- $usage
Mosaic(Mosaic)
,Aspect(..)
,shallower
,steeper
,growMaster
,shrinkMaster
)
where
import Prelude hiding (sum)
import XMonad(Typeable,
LayoutClass(doLayout , pureMessage, description), Message,
fromMessage, splitHorizontallyBy, splitVerticallyBy, Rectangle)
import XMonad.StackSet(integrate)
import Data.Foldable(Foldable(foldMap), sum)
import Data.Monoid(Monoid(mappend, mempty))
-- $usage
-- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:
--
-- > import XMonad.Layout.Mosaic
--
-- Then edit your @layoutHook@ by adding the Mosaic layout:
--
-- > myLayouts = Mosaic (take 5 $ iterate (*0.7) 1 ||| Mosaic [3,1,1,1,1,1] ||| Full ||| etc..
-- > main = xmonad defaultConfig { layoutHook = myLayouts }
--
-- Unfortunately, infinite lists break serialization, so don't use them.
--
-- To change the choice in aspect ratio and the relative sizes of windows, add
-- to your keybindings:
--
-- > , ((modMask, xK_a), sendMessage Taller)
-- > , ((modMask, xK_z), sendMessage Wider)
-- > , ((modMask, xK_h), sendMessage Shrink >> sendMessage (SlopeMod shallower))
-- > , ((modMask, xK_l), sendMessage Expand >> sendMessage (SlopeMod steeper))
--
-- > , ((modMask, xK_r), sendMessage Reset)
--
-- For more detailed instructions on editing the layoutHook see:
--
-- "XMonad.Doc.Extending#Editing_the_layout_hook"
data Aspect
= Taller
| Wider
| Reset
| SlopeMod ([Rational] -> [Rational])
deriving (Typeable)
instance Message Aspect
data Mosaic a
{- | The relative magnitudes (the sign is ignored) of the rational numbers
- provided determine the relative areas that the windows receive. The
- first number represents the size of the master window, the second is for
- the next window in the stack, and so on. Windows without a list element
- are hidden.
-}
= Mosaic [Rational]
-- override the aspect? current index, maximum index
| MosaicSt Bool Rational Int [Rational]
deriving (Read, Show)
instance LayoutClass Mosaic a where
description = const "Mosaic"
pureMessage (Mosaic _ss) _ms = Nothing
pureMessage (MosaicSt _ ix mix ss) ms = fromMessage ms >>= ixMod
where ixMod Taller | rix >= mix = Nothing
| otherwise = Just $ MosaicSt False (succ ix) mix ss
ixMod Wider | rix <= 0 = Nothing
| otherwise = Just $ MosaicSt False (pred ix) mix ss
ixMod Reset = Just $ Mosaic ss
ixMod (SlopeMod f) = Just $ MosaicSt False ix mix (f ss)
rix = round ix
doLayout (Mosaic ss) r st = return (zip (integrate st) rect, newLayout)
where rects = splits (length $ integrate st) r ss
lrects = length rects
rect = rects !! (lrects `div` 2)
newLayout = Just $ MosaicSt True (fromIntegral lrects / 2) (pred lrects) ss
doLayout (MosaicSt override ix mix ss) r st
= return (zip (integrate st) rect, newLayout)
where rects = splits (length $ integrate st) r ss
lrects = length rects
nix = if mix == 0 || override then fromIntegral $ lrects `div` 2
else max 0 $ min (fromIntegral $ pred lrects)
$ fromIntegral (pred lrects) * ix / fromIntegral mix
rect = rects !! round nix
newLayout = Just $ MosaicSt override nix (pred lrects) ss
-- | These sample functions are meant to be applied to the list of window sizes
-- through the 'SlopeMod' message.
--
-- Steeper and shallower scale the ratios of successive windows.
--
-- growMaster and shrinkMaster just increase and decrease the size of the first
-- element, and thus they change the layout very similarily to the standard
-- 'Expand' or 'Shrink' for the 'Tall' layout.
--
-- It may be possible to resize the specific focused window; however the same
-- result could probably be achieved by promoting it, or moving it to a higher
-- place in the list of windows; when you have a decreasing list of window
-- sizes, the change in position will also result in a change in size.
steeper :: [Rational] -> [Rational]
steeper [] = []
steeper xs = map (subtract (minimum xs*0.8)) xs
shallower :: [Rational] -> [Rational]
shallower [] = []
shallower xs = map (+(minimum xs*2)) xs
growMaster :: [Rational] -> [Rational]
growMaster [] = []
growMaster (x:xs) = 2*x:xs
shrinkMaster :: [Rational] -> [Rational]
shrinkMaster [] = []
shrinkMaster (x:xs) = x/2:xs
splits :: Int -> Rectangle -> [Rational] -> [[Rectangle]]
splits num rect = splitsL rect . makeTree . normalize
. map abs . reverse . take num
-- recursively enumerate splits
splitsL :: Rectangle -> Tree Rational -> [[Rectangle]]
splitsL _rect Empty = []
splitsL rect (Leaf _) = [[rect]]
splitsL rect (Branch l r) = do
let mkSplit f = f (sum l / (sum l + sum r)) rect
(rl,rr) <- map mkSplit [splitVerticallyBy,splitHorizontallyBy]
splitsL rl l `interleave` splitsL rr r
-- like zipWith (++), but when one list is shorter, its elements are duplicated
-- so that they match
interleave :: [[a]] -> [[a]] -> [[a]]
interleave xs ys | lx > ly = zc xs (extend lx ys)
| otherwise = zc (extend ly xs) ys
where lx = length xs
ly = length ys
zc = zipWith (++)
extend :: Int -> [a] -> [a]
extend n pat = do
(p,e) <- zip pat $ replicate m True ++ repeat False
[p | e] ++ replicate d p
where (d,m) = n `divMod` length pat
normalize :: Fractional a => [a] -> [a]
normalize x = let s = sum x
in map (/s) x
data Tree a = Branch (Tree a) (Tree a) | Leaf a | Empty
deriving (Show)
instance Foldable Tree where
foldMap _f Empty = mempty
foldMap f (Leaf x) = f x
foldMap f (Branch l r) = foldMap f l `mappend` foldMap f r
instance Monoid (Tree a) where
mempty = Empty
mappend Empty x = x
mappend x Empty = x
mappend x y = Branch x y
makeTree :: [Rational] -> Tree Rational
makeTree [] = Empty
makeTree [x] = Leaf x
makeTree xs = Branch (makeTree a) (makeTree b)
where ((a,b),_) = foldr w (([],[]),(0,0)) xs
w n ((ls,rs),(l,r)) = if l > r then ((ls,n:rs),(l,n+r))
else ((n:ls,rs),(n+l,r))
|
