{-# LANGUAGE DeriveDataTypeable, FlexibleInstances, MultiParamTypeClasses #-} ---------------------------------------------------------------------- -- | -- Module : XMonad.Layout.GridVariants -- Copyright : (c) Norbert Zeh -- License : BSD-style (see LICENSE) -- -- Maintainer : nzeh@cs.dal.ca -- Stability : unstable -- Portability : unportable -- -- Two layouts: one is a variant of the Grid layout that allows the -- desired aspect ratio of windows to be specified. The other is like -- Tall but places a grid with fixed number of rows and columns in the -- master area and uses an aspect-ratio-specified layout for the -- slaves. ---------------------------------------------------------------------- module XMonad.Layout.GridVariants ( -- * Usage -- $usage ChangeMasterGeom(..) , Grid(..) , TallGrid(..) , SplitGrid(..) , Orientation(..) ) where import Control.Monad import XMonad import qualified XMonad.StackSet as W -- $usage -- This module can be used as follows: -- -- > import XMonad.Layout.GridVariants -- -- Then add something like this to your layouts: -- -- > Grid (16/10) -- -- for a 16:10 aspect ratio grid, or -- -- > SplitGrid L 2 3 (2/3) (16/10) (5/100) -- -- for a layout with a 2x3 master grid that uses 2/3 of the screen, -- and a 16:10 aspect ratio slave grid to its right. The last -- parameter is again the percentage by which the split between master -- and slave area changes in response to Expand/Shrink messages. -- -- To be able to change the geometry of the master grid, add something -- like this to your keybindings: -- -- > ((modm .|. shiftMask, xK_equal), sendMessage $ IncMasterCols 1), -- > ((modm .|. shiftMask, xK_minus), sendMessage $ IncMasterCols (-1)), -- > ((modm .|. controlMask, xK_equal), sendMessage $ IncMasterRows 1), -- > ((modm .|. controlMask, xK_minus), sendMessage $ IncMasterRows (-1)) -- | Grid layout. The parameter is the desired x:y aspect ratio of windows data Grid a = Grid !Rational deriving (Read, Show) instance LayoutClass Grid a where pureLayout (Grid aspect) rect st = zip wins rects where wins = W.integrate st nwins = length wins rects = arrangeAspectGrid rect nwins aspect description _ = "Grid" -- | SplitGrid layout. Parameters are -- -- - side where the master is -- - number of master rows -- - number of master columns -- - portion of screen used for master grid -- - x:y aspect ratio of slave windows -- - increment for resize messages data SplitGrid a = SplitGrid Orientation !Int !Int !Rational !Rational !Rational deriving (Read, Show) -- | Type to specify the side of the screen that holds -- the master area of a SplitGrid. data Orientation = T | B | L | R deriving (Eq, Read, Show) instance LayoutClass SplitGrid a where pureLayout (SplitGrid o mrows mcols mfrac saspect _) rect st = zip wins rects where wins = W.integrate st nwins = length wins rects = arrangeSplitGrid rect o nwins mrows mcols mfrac saspect pureMessage layout msg = msum [ fmap (resizeMaster layout) (fromMessage msg) , fmap (changeMasterGrid layout) (fromMessage msg) ] description _ = "SplitGrid" -- |The geometry change message understood by the master grid data ChangeMasterGeom = IncMasterRows !Int -- ^Change the number of master rows | IncMasterCols !Int -- ^Change the number of master columns deriving Typeable instance Message ChangeMasterGeom arrangeSplitGrid :: Rectangle -> Orientation -> Int -> Int -> Int -> Rational -> Rational -> [Rectangle] arrangeSplitGrid rect@(Rectangle rx ry rw rh) o nwins mrows mcols mfrac saspect | nwins <= mwins = arrangeMasterGrid rect nwins mcols | mwins == 0 = arrangeAspectGrid rect nwins saspect | otherwise = (arrangeMasterGrid mrect mwins mcols) ++ (arrangeAspectGrid srect swins saspect) where mwins = mrows * mcols swins = nwins - mwins mrect = Rectangle mx my mw mh srect = Rectangle sx sy sw sh (mh, sh, mw, sw) = if o `elem` [T, B] then (ceiling (fromIntegral rh * mfrac), rh - mh, rw, rw) else (rh, rh, ceiling (fromIntegral rw * mfrac), rw - mw) mx = fromIntegral rx + if o == R then fromIntegral sw else 0 my = fromIntegral ry + if o == B then fromIntegral sh else 0 sx = fromIntegral rx + if o == L then fromIntegral mw else 0 sy = fromIntegral ry + if o == T then fromIntegral mh else 0 arrangeMasterGrid :: Rectangle -> Int -> Int -> [Rectangle] arrangeMasterGrid rect nwins mcols = arrangeGrid rect nwins (min nwins mcols) arrangeAspectGrid :: Rectangle -> Int -> Rational -> [Rectangle] arrangeAspectGrid rect@(Rectangle _ _ rw rh) nwins aspect = arrangeGrid rect nwins (min nwins ncols) where scr_a = fromIntegral rw / fromIntegral rh fcols = sqrt ( fromRational $ scr_a * fromIntegral nwins / aspect ) :: Double cols1 = floor fcols :: Int cols2 = ceiling fcols :: Int rows1 = ceiling ( fromIntegral nwins / fromIntegral cols1 :: Rational ) :: Int rows2 = floor ( fromIntegral nwins / fromIntegral cols2 :: Rational ) :: Int a1 = scr_a * fromIntegral rows1 / fromIntegral cols1 a2 = scr_a * fromIntegral rows2 / fromIntegral cols2 ncols | cols1 == 0 = cols2 | rows2 == 0 = cols1 | a1 / aspect < aspect / a2 = cols1 | otherwise = cols2 arrangeGrid :: Rectangle -> Int -> Int -> [Rectangle] arrangeGrid (Rectangle rx ry rw rh) nwins ncols = [Rectangle (fromIntegral x + rx) (fromIntegral y + ry) (fromIntegral w) (fromIntegral h) | (x, y, w, h) <- rects] where nrows_in_cols = listDifference $ splitEvenly nwins ncols x_slabs = splitIntoSlabs (fromIntegral rw) ncols y_slabs = [splitIntoSlabs (fromIntegral rh) nrows | nrows <- nrows_in_cols] rects_in_cols = [[(x, y, w, h) | (y, h) <- lst] | ((x, w), lst) <- zip x_slabs y_slabs] rects = foldr (++) [] rects_in_cols splitIntoSlabs :: Int -> Int -> [(Int, Int)] splitIntoSlabs width nslabs = zip (0:xs) widths where xs = splitEvenly width nslabs widths = listDifference xs listDifference :: [Int] -> [Int] listDifference lst = [cur-pre | (cur,pre) <- zip lst (0:lst)] splitEvenly :: Int -> Int -> [Int] splitEvenly n parts = [ sz-off | (sz,off) <- zip sizes offsets] where size = ceiling ( (fromIntegral n / fromIntegral parts) :: Double ) extra = size*parts - n sizes = [i*size | i <- [1..parts]] offsets = (take (fromIntegral extra) [1..]) ++ [extra,extra..] resizeMaster :: SplitGrid a -> Resize -> SplitGrid a resizeMaster (SplitGrid o mrows mcols mfrac saspect delta) Shrink = SplitGrid o mrows mcols (max 0 (mfrac - delta)) saspect delta resizeMaster (SplitGrid o mrows mcols mfrac saspect delta) Expand = SplitGrid o mrows mcols (min 1 (mfrac + delta)) saspect delta changeMasterGrid :: SplitGrid a -> ChangeMasterGeom -> SplitGrid a changeMasterGrid (SplitGrid o mrows mcols mfrac saspect delta) (IncMasterRows d) = SplitGrid o (max 0 (mrows + d)) mcols mfrac saspect delta changeMasterGrid (SplitGrid o mrows mcols mfrac saspect delta) (IncMasterCols d) = SplitGrid o mrows (max 0 (mcols + d)) mfrac saspect delta -- | TallGrid layout. Parameters are -- -- - number of master rows -- - number of master columns -- - portion of screen used for master grid -- - x:y aspect ratio of slave windows -- - increment for resize messages -- -- This exists mostly because it was introduced in an earlier version. -- It's a fairly thin wrapper around "SplitGrid L". data TallGrid a = TallGrid !Int !Int !Rational !Rational !Rational deriving (Read, Show) instance LayoutClass TallGrid a where pureLayout (TallGrid mrows mcols mfrac saspect _) rect st = zip wins rects where wins = W.integrate st nwins = length wins rects = arrangeSplitGrid rect L nwins mrows mcols mfrac saspect pureMessage layout msg = msum [ fmap ((tallGridAdapter resizeMaster) layout) (fromMessage msg) , fmap ((tallGridAdapter changeMasterGrid) layout) (fromMessage msg) ] description _ = "TallGrid" tallGridAdapter :: (SplitGrid a -> b -> SplitGrid a) -> TallGrid a -> b -> TallGrid a tallGridAdapter f (TallGrid mrows mcols mfrac saspect delta) msg = TallGrid mrows' mcols' mfrac' saspect' delta' where SplitGrid _ mrows' mcols' mfrac' saspect' delta' = f (SplitGrid L mrows mcols mfrac saspect delta) msg