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module Spiral (spiral) where
import Graphics.X11.Xlib
import Operations
import Data.Ratio
import XMonad
--
-- Spiral layout
--
-- eg,
-- defaultLayouts :: [Layout]
-- defaultLayouts = [ full,
-- tall defaultWindowsInMaster defaultDelta (1%2),
-- wide defaultWindowsInMaster defaultDelta (1%2),
-- spiral (1000 % 1618) ]
--
spiral :: Rational -> Layout
spiral rat = Layout { doLayout = \sc ws -> return $ zip ws (divideRects rat (length ws) East $ sc),
modifyLayout = \m -> fmap resize (fromMessage m)}
where resize Expand = let newRat = ((numerator rat + 10) % (denominator rat))
normRat = if numerator newRat > denominator newRat then rat else newRat in
spiral normRat
resize Shrink = let newRat = ((numerator rat - 10) % (denominator rat))
normRat = if numerator newRat < 0 then rat else newRat in
spiral normRat
data Direction = East | South | West | North
nextDir :: Direction -> Direction
nextDir East = South
nextDir South = West
nextDir West = North
nextDir North = East
divideRects :: Rational -> Int -> Direction -> Rectangle -> [Rectangle]
divideRects r n dir rect | n <= 1 = [rect]
| otherwise = case divideRect r dir rect of
(r1, r2) -> r1 : (divideRects r (n - 1) (nextDir dir) r2)
divideRect :: Rational -> Direction -> Rectangle -> (Rectangle, Rectangle)
divideRect ratio East (Rectangle x y w h) = let (w1, w2) = chop ratio (fromIntegral w) in
(Rectangle x y (fromIntegral w1) h,
Rectangle (x + (fromIntegral w1)) y (fromIntegral w2) h)
divideRect ratio South (Rectangle x y w h) = let (h1, h2) = chop ratio (fromIntegral h) in
(Rectangle x y w (fromIntegral h1),
Rectangle x (y + (fromIntegral h1)) w (fromIntegral h2))
divideRect ratio West (Rectangle x y w h) = let (w1, w2) = chop (1 - ratio) (fromIntegral w) in
(Rectangle (x + (fromIntegral w1)) y (fromIntegral w2) h,
Rectangle x y (fromIntegral w1) h)
divideRect ratio North (Rectangle x y w h) = let (h1, h2) = chop (1 - ratio) (fromIntegral h) in
(Rectangle x (y + (fromIntegral h1)) w (fromIntegral h2),
Rectangle x y w (fromIntegral h1))
chop :: Rational -> Integer -> (Integer, Integer)
chop rat n = let f = ((fromIntegral n) * (numerator rat)) `div` (denominator rat) in
(f, n - f)
|
