{-# OPTIONS_GHC -fglasgow-exts #-} -- for deriving Typeable
{-# LANGUAGE PatternGuards, FlexibleInstances, MultiParamTypeClasses, TypeSynonymInstances #-}
-----------------------------------------------------------------------------
-- |
-- Module : XMonad.Layout.WindowArranger
-- Copyright : (c) Andrea Rossato 2007
-- License : BSD-style (see xmonad/LICENSE)
--
-- Maintainer : andrea.rossato@unibz.it
-- Stability : unstable
-- Portability : unportable
--
-- This is a pure layout modifier that will let you move and resize
-- windows with the keyboard in any layout.
-----------------------------------------------------------------------------
module XMonad.Layout.WindowArranger
( -- * Usage
-- $usage
windowArranger
, WindowArrangerMsg (..)
, WindowArranger
, memberFromList
, listFromList
, diff
) where
import XMonad
import qualified XMonad.StackSet as S
import XMonad.Layout.LayoutModifier
import XMonad.Util.XUtils (fi)
import Control.Arrow
import Data.List
import Data.Maybe
-- $usage
-- You can use this module with the following in your
-- @~\/.xmonad\/xmonad.hs@:
--
-- > import XMonad.Layout.WindowArranger
-- > myLayout = layoutHook defaultConfig
-- > main = xmonad defaultConfig { layoutHook = windowArranger myLayout }
--
-- For more detailed instructions on editing the layoutHook see:
--
-- "XMonad.Doc.Extending#Editing_the_layout_hook"
--
-- You may also want to define some key binding to move or resize
-- windows. These are good defaults:
--
-- > , ((modMask x .|. controlMask , xK_s ), sendMessage Arrange )
-- > , ((modMask x .|. controlMask .|. shiftMask, xK_s ), sendMessage DeArrange )
-- > , ((modMask x .|. controlMask , xK_Left ), sendMessage (MoveLeft 1))
-- > , ((modMask x .|. controlMask , xK_Right), sendMessage (MoveRight 1))
-- > , ((modMask x .|. controlMask , xK_Down ), sendMessage (MoveDown 1))
-- > , ((modMask x .|. controlMask , xK_Up ), sendMessage (MoveUp 1))
-- > , ((modMask x .|. shiftMask, xK_Left ), sendMessage (IncreaseLeft 1))
-- > , ((modMask x .|. shiftMask, xK_Right), sendMessage (IncreaseRight 1))
-- > , ((modMask x .|. shiftMask, xK_Down ), sendMessage (IncreaseDown 1))
-- > , ((modMask x .|. shiftMask, xK_Up ), sendMessage (IncreaseUp 1))
-- > , ((modMask x .|. controlMask .|. shiftMask, xK_Left ), sendMessage (DecreaseLeft 1))
-- > , ((modMask x .|. controlMask .|. shiftMask, xK_Right), sendMessage (DecreaseRight 1))
-- > , ((modMask x .|. controlMask .|. shiftMask, xK_Down ), sendMessage (DecreaseDown 1))
-- > , ((modMask x .|. controlMask .|. shiftMask, xK_Up ), sendMessage (DecreaseUp 1))
--
-- For detailed instructions on editing your key bindings, see
-- "XMonad.Doc.Extending#Editing_key_bindings".
-- | A layout modifier to float the windows in a workspace
windowArranger :: l a -> ModifiedLayout WindowArranger l a
windowArranger = ModifiedLayout (WA True [])
data WindowArrangerMsg = DeArrange
| Arrange
| IncreaseLeft Int
| IncreaseRight Int
| IncreaseUp Int
| IncreaseDown Int
| DecreaseLeft Int
| DecreaseRight Int
| DecreaseUp Int
| DecreaseDown Int
| MoveLeft Int
| MoveRight Int
| MoveUp Int
| MoveDown Int
deriving ( Typeable )
instance Message WindowArrangerMsg
data ArrangedWindow a = WR (a, Rectangle)
| AWR (a, Rectangle)
deriving (Read, Show)
data WindowArranger a = WA Bool [ArrangedWindow a] deriving (Read, Show)
instance (Show a, Read a, Eq a) => LayoutModifier WindowArranger a where
pureModifier (WA True [] ) _ _ wrs = arrangeWindows wrs
pureModifier (WA True awrs) _ (S.Stack w _ _) wrs = curry process wrs awrs
where
wins = map fst *** map awrWin
update (a,r) = mkNewAWRs a *** removeAWRs r >>> uncurry (++)
process = wins &&& id >>> first diff >>> uncurry update >>>
replaceWR wrs >>> putOnTop w >>> map fromAWR &&& Just . WA True
pureModifier _ _ _ wrs = (wrs, Nothing)
pureMess (WA True (wr:wrs)) m
-- increase the window's size
| Just (IncreaseRight i) <- fm, (win, Rectangle x y w h) <- fa = res win x y (w + fi i) h
| Just (IncreaseLeft i) <- fm, (win, Rectangle x y w h) <- fa = res win (x - fi i) y (w + fi i) h
| Just (IncreaseUp i) <- fm, (win, Rectangle x y w h) <- fa = res win x (y - fi i) w (h + fi i)
| Just (IncreaseDown i) <- fm, (win, Rectangle x y w h) <- fa = res win x y w (h + fi i)
-- decrease the window's size
| Just (DecreaseRight i) <- fm, (win, Rectangle x y w h) <- fa = res win (x + fi i) y (chk w i) h
| Just (DecreaseLeft i) <- fm, (win, Rectangle x y w h) <- fa = res win x y (chk w i) h
| Just (DecreaseUp i) <- fm, (win, Rectangle x y w h) <- fa = res win x y w (chk h i)
| Just (DecreaseDown i) <- fm, (win, Rectangle x y w h) <- fa = res win x (y + fi i) w (chk h i)
--move the window around
| Just (MoveRight i) <- fm, (win, Rectangle x y w h) <- fa = res win (x + fi i) y w h
| Just (MoveLeft i) <- fm, (win, Rectangle x y w h) <- fa = res win (x - fi i) y w h
| Just (MoveUp i) <- fm, (win, Rectangle x y w h) <- fa = res win x (y - fi i) w h
| Just (MoveDown i) <- fm, (win, Rectangle x y w h) <- fa = res win x (y + fi i) w h
where res wi x y w h = Just . WA True $ AWR (wi,Rectangle x y w h):wrs
fm = fromMessage m
fa = fromAWR wr
chk x y = fi $ max 1 (fi x - y)
pureMess (WA _ l) m
| Just DeArrange <- fromMessage m = Just $ WA False l
| Just Arrange <- fromMessage m = Just $ WA True l
| otherwise = Nothing
arrangeWindows :: [(a,Rectangle)] -> ([(a, Rectangle)], Maybe (WindowArranger a))
arrangeWindows wrs = (wrs, Just $ WA True (map WR wrs))
fromAWR :: ArrangedWindow a -> (a, Rectangle)
fromAWR (WR x) = x
fromAWR (AWR x) = x
awrWin :: ArrangedWindow a -> a
awrWin = fst . fromAWR
getAWR :: Eq a => a -> [ArrangedWindow a] -> [ArrangedWindow a]
getAWR = memberFromList awrWin (==)
getWR :: Eq a => a -> [(a,Rectangle)] -> [(a,Rectangle)]
getWR = memberFromList fst (==)
mkNewAWRs :: Eq a => [a] -> [(a,Rectangle)] -> [ArrangedWindow a]
mkNewAWRs w wrs = map WR . concatMap (flip getWR wrs) $ w
removeAWRs :: Eq a => [a] -> [ArrangedWindow a] -> [ArrangedWindow a]
removeAWRs = listFromList awrWin notElem
putOnTop :: Eq a => a -> [ArrangedWindow a] -> [ArrangedWindow a]
putOnTop w awrs = awr ++ nawrs
where awr = getAWR w awrs
nawrs = filter ((/=w) . awrWin) awrs
replaceWR :: Eq a => [(a, Rectangle)] -> [ArrangedWindow a] -> [ArrangedWindow a]
replaceWR wrs = foldr r []
where r x xs
| WR wr <- x = case fst wr `elemIndex` map fst wrs of
Just i -> (WR $ wrs !! i):xs
Nothing -> x:xs
| otherwise = x:xs
-- | Given a function to be applied to each member of a list, and a
-- function to check a condition by processing this transformed member
-- with the members of a list, you get the list of members that
-- satisfy the condition.
listFromList :: (b -> c) -> (c -> [a] -> Bool) -> [a] -> [b] -> [b]
listFromList f g l = foldr (h l) []
where h x y ys = if g (f y) x then y:ys else ys
-- | Given a function to be applied to each member of ta list, and a
-- function to check a condition by processing this transformed member
-- with something, you get the first member that satisfy the condition,
-- or an empty list.
memberFromList :: (b -> c) -> (c -> a -> Bool) -> a -> [b] -> [b]
memberFromList f g l = foldr (h l) []
where h x y ys = if g (f y) x then [y] else ys
-- | Get the list of elements to be deleted and the list ef elements to
-- be added to the first list in order to get the second list.
diff :: Eq a => ([a],[a]) -> ([a],[a])
diff (x,y) = (x \\ y, y \\ x)
