{-# LANGUAGE PatternGuards, FlexibleInstances, MultiParamTypeClasses #-}
{-# OPTIONS -fglasgow-exts #-}
-- deriving Typeable
-----------------------------------------------------------------------------
-- |
-- Module : XMonad.Hooks.ManageDocks
-- Copyright : (c) Joachim Breitner <mail@joachim-breitner.de>
-- License : BSD
--
-- Maintainer : Joachim Breitner <mail@joachim-breitner.de>
-- Stability : unstable
-- Portability : unportable
--
-- This module provides tools to automatically manage 'dock' type programs,
-- such as gnome-panel, kicker, dzen, and xmobar.
module XMonad.Hooks.ManageDocks (
-- * Usage
-- $usage
manageDocks, checkDock, AvoidStruts, avoidStruts, avoidStrutsOn,
ToggleStruts(..), Direction(..)
) where
-----------------------------------------------------------------------------
import XMonad
import Foreign.C.Types (CLong)
import Control.Monad
import XMonad.Layout.LayoutModifier
import Data.List (delete)
-- $usage
-- To use this module, add the following import to @~\/.xmonad\/xmonad.hs@:
--
-- > import XMonad.Hooks.ManageDocks
--
-- The first component is a 'ManageHook' which recognizes these
-- windows and de-manages them, so that xmonad does not try to tile
-- them. To enable it:
--
-- > manageHook = ... <+> manageDocks
--
-- The second component is a layout modifier that prevents windows
-- from overlapping these dock windows. It is intended to replace
-- xmonad's so-called \"gap\" support. First, you must add it to your
-- list of layouts:
--
-- > layoutHook = avoidStruts (tall ||| mirror tall ||| ...)
-- > where tall = Tall 1 (3/100) (1/2)
--
-- 'AvoidStruts' also supports toggling the dock gaps; add a keybinding
-- similar to:
--
-- > ,((modMask x, xK_b ), sendMessage ToggleStruts)
--
-- If you have multiple docks, you can toggle their gaps individually.
-- For example, to toggle only the top gap:
--
-- > ,((modMask x .|. controlMask, xK_t), sendMessage $ ToggleStrut U)
--
-- Similarly, you can use 'D', 'L', and 'R' to individually toggle
-- gaps on the bottom, left, or right.
--
-- If you want certain docks to be avoided but others to be covered by
-- default, you can manually specify the sides of the screen on which
-- docks should be avoided, using 'avoidStrutsOn'. For example:
--
-- > layoutHook = avoidStrutsOn [U,L] (tall ||| mirror tall ||| ...)
--
-- /Important note/: if you are switching from manual gaps
-- (defaultGaps in your config) to avoidStruts (recommended, since
-- manual gaps will probably be phased out soon), be sure to switch
-- off all your gaps (with mod-b) /before/ reloading your config with
-- avoidStruts! Toggling struts with a 'ToggleStruts' message will
-- not work unless your gaps are set to zero.
--
-- For detailed instructions on editing your key bindings, see
-- "XMonad.Doc.Extending#Editing_key_bindings".
--
-- | An enumeration of the four cardinal directions\/sides of the
-- screen.
--
-- Ideally this would go in its own separate module in Util,
-- but ManageDocks is angling for inclusion into the xmonad core,
-- so keep the dependencies to a minimum.
data Direction = U | D | R | L deriving ( Read, Show, Eq, Ord, Enum, Bounded )
-- | Detects if the given window is of type DOCK and if so, reveals
-- it, but does not manage it. If the window has the STRUT property
-- set, adjust the gap accordingly.
manageDocks :: ManageHook
manageDocks = checkDock --> doIgnore
-- | Checks if a window is a DOCK or DESKTOP window
checkDock :: Query Bool
checkDock = ask >>= \w -> liftX $ do
a <- getAtom "_NET_WM_WINDOW_TYPE"
dock <- getAtom "_NET_WM_WINDOW_TYPE_DOCK"
desk <- getAtom "_NET_WM_WINDOW_TYPE_DESKTOP"
mbr <- getProp a w
case mbr of
Just [r] -> return $ elem (fromIntegral r) [dock, desk]
_ -> return False
-- | Gets the STRUT config, if present, in xmonad gap order
getStrut :: Window -> X [Strut]
getStrut w = do
spa <- getAtom "_NET_WM_STRUT_PARTIAL"
sa <- getAtom "_NET_WM_STRUT"
msp <- getProp spa w
case msp of
Just sp -> return $ parseStrutPartial sp
Nothing -> fmap (maybe [] parseStrut) $ getProp sa w
where
parseStrut xs@[_, _, _, _] = parseStrutPartial . take 12 $ xs ++ cycle [minBound, maxBound]
parseStrut _ = []
parseStrutPartial [l, r, t, b, ly1, ly2, ry1, ry2, tx1, tx2, bx1, bx2]
= filter (\(_, n, _, _) -> n /= 0)
[(L, l, ly1, ly2), (R, r, ry1, ry2), (U, t, tx1, tx2), (D, b, bx1, bx2)]
parseStrutPartial _ = []
-- | Helper to read a property
getProp :: Atom -> Window -> X (Maybe [CLong])
getProp a w = withDisplay $ \dpy -> io $ getWindowProperty32 dpy a w
-- | Goes through the list of windows and find the gap so that all
-- STRUT settings are satisfied.
calcGap :: [Direction] -> X (Rectangle -> Rectangle)
calcGap ss = withDisplay $ \dpy -> do
rootw <- asks theRoot
-- We don't keep track of dock like windows, so we find all of them here
(_,_,wins) <- io $ queryTree dpy rootw
struts <- (filter careAbout . concat) `fmap` mapM getStrut wins
-- we grab the window attributes of the root window rather than checking
-- the width of the screen because xlib caches this info and it tends to
-- be incorrect after RAndR
wa <- io $ getWindowAttributes dpy rootw
let screen = r2c $ Rectangle (fi $ wa_x wa) (fi $ wa_y wa) (fi $ wa_width wa) (fi $ wa_height wa)
return $ \r -> c2r $ foldr (reduce screen) (r2c r) struts
where careAbout (s,_,_,_) = s `elem` ss
-- | Adjust layout automagically: don't cover up any docks, status
-- bars, etc.
avoidStruts :: LayoutClass l a => l a -> ModifiedLayout AvoidStruts l a
avoidStruts = avoidStrutsOn [U,D,L,R]
-- | Adjust layout automagically: don't cover up docks, status bars,
-- etc. on the indicated sides of the screen. Valid sides are U
-- (top), D (bottom), R (right), or L (left).
avoidStrutsOn :: LayoutClass l a =>
[Direction]
-> l a
-> ModifiedLayout AvoidStruts l a
avoidStrutsOn ss = ModifiedLayout (AvoidStruts ss)
data AvoidStruts a = AvoidStruts [Direction] deriving ( Read, Show )
-- | Message type which can be sent to an 'AvoidStruts' layout
-- modifier to alter its behavior.
data ToggleStruts = ToggleStruts
| ToggleStrut Direction
deriving (Read,Show,Typeable)
instance Message ToggleStruts
instance LayoutModifier AvoidStruts a where
modifyLayout (AvoidStruts ss) w r = do
nr <- fmap ($ r) (calcGap ss)
runLayout w nr
handleMess (AvoidStruts ss) m
| Just ToggleStruts <- fromMessage m = return $ Just $ AvoidStruts (toggleAll ss)
| Just (ToggleStrut s) <- fromMessage m = return $ Just $ AvoidStruts (toggleOne s ss)
| otherwise = return Nothing
where toggleAll [] = [U,D,L,R]
toggleAll _ = []
toggleOne x xs | x `elem` xs = delete x xs
| otherwise = x : xs
-- | (Direction, height\/width, initial pixel, final pixel).
type Strut = (Direction, CLong, CLong, CLong)
-- | (Initial x pixel, initial y pixel,
-- final x pixel, final y pixel).
type RectC = (CLong, CLong, CLong, CLong)
fi :: (Integral a, Num b) => a -> b
fi = fromIntegral
-- | Invertible conversion.
r2c :: Rectangle -> RectC
r2c (Rectangle x y w h) = (fi x, fi y, fi x + fi w - 1, fi y + fi h - 1)
-- | Invertible conversion.
c2r :: RectC -> Rectangle
c2r (x1, y1, x2, y2) = Rectangle (fi x1) (fi y1) (fi $ x2 - x1 + 1) (fi $ y2 - y1 + 1)
-- TODO: Add these QuickCheck properties to the test suite, along with
-- suitable Arbitrary instances.
-- prop_r2c_c2r :: RectC -> Bool
-- prop_r2c_c2r r = r2c (c2r r) == r
-- prop_c2r_r2c :: Rectangle -> Bool
-- prop_c2r_r2c r = c2r (r2c r) == r
reduce :: RectC -> Strut -> RectC -> RectC
reduce (sx0, sy0, sx1, sy1) (s, n, l, h) (x0, y0, x1, y1) = case s of
L | p (y0, y1) -> (mx x0 sx0 , y0 , x1 , y1 )
R | p (y0, y1) -> (x0 , y0 , mn x1 sx1, y1 )
U | p (x0, x1) -> (x0 , mx y0 sy0, x1 , y1 )
D | p (x0, x1) -> (x0 , y0 , x1 , mn y1 sy1)
_ -> (x0 , y0 , x1 , y1 )
where
mx a b = max a (b + n)
mn a b = min a (b - n)
p r = r `overlaps` (l, h)
-- | Do the two ranges overlap?
--
-- Precondition for every input range @(x, y)@: @x '<=' y@.
--
-- A range @(x, y)@ is assumed to include every pixel from @x@ to @y@.
overlaps :: Ord a => (a, a) -> (a, a) -> Bool
(a, b) `overlaps` (x, y) =
inRange (a, b) x || inRange (a, b) y || inRange (x, y) a
where
inRange (i, j) k = i <= k && k <= j
