-----------------------------------------------------------------------------
-- |
-- Module : XMonad.Actions.WindowNavigation
-- Copyright : (c) 2007 David Roundy <droundy@darcs.net>,
-- Devin Mullins <me@twifkak.com>
-- Maintainer : Devin Mullins <me@twifkak.com>
-- License : BSD3-style (see LICENSE)
--
-- This is a rewrite of "XMonad.Layout.WindowNavigation". WindowNavigation
-- lets you assign keys to move up\/down\/left\/right, based on actual cartesian
-- window coordinates, rather than just going j\/k on the stack.
--
-- This module is experimental. You'll have better luck with the original.
--
-- This module differs from the other in a few ways:
--
-- (1) You can go up\/down\/left\/right across multiple screens.
--
-- (2) It doesn't provide little border colors for your neighboring windows.
--
-- (3) It doesn't provide the \'Move\' action, which seems to be related to
-- the XMonad.Layout.Combo extension.
--
-- (4) It tries to be slightly smarter about tracking your current position.
--
-- (5) Configuration is different.
--
-----------------------------------------------------------------------------
module XMonad.Actions.WindowNavigation (
-- * Usage
-- $usage
withWindowNavigation,
withWindowNavigationKeys,
WNAction(..),
go, swap,
Direction2D(..)
) where
import XMonad
import XMonad.Util.Types (Direction2D(..))
import qualified XMonad.StackSet as W
import Control.Applicative ((<$>))
import Control.Arrow (second)
import Data.IORef
import Data.List (sortBy)
import Data.Map (Map())
import qualified Data.Map as M
import Data.Maybe (catMaybes, fromMaybe, listToMaybe)
import Data.Ord (comparing)
import qualified Data.Set as S
import Graphics.X11.Xlib
-- $usage
--
-- To use it, you're going to apply the 'withWindowNavigation' function.
-- 'withWindowNavigation' performs some IO operations, so the syntax you'll use
-- is the same as the spawnPipe example in "XMonad.Hooks.DynamicLog".
-- In particular:
--
-- > main = do
-- > config <- withWindowNavigation (xK_w, xK_a, xK_s, xK_d)
-- > $ defaultConfig { ... }
-- > xmonad config
--
-- Here, we pass in the keys for navigation in counter-clockwise order from up.
-- It creates keybindings for @modMask@ to move to window, and @modMask .|. shiftMask@
-- to swap windows.
--
-- If you want more flexibility over your keybindings, you can use
-- 'withWindowNavigationKeys', which takes a list of @keys@-esque entries rather
-- than a tuple of the four directional keys. See the source code of
-- 'withWindowNavigation' for an example.
-- TODO:
-- - monad for WNState?
-- - cleanup (including inr)
-- - more documentation
-- - tests? (esp. for edge cases in currentPosition)
-- - screen 1, 1+2/w 3, M-d, M-w, M-2 (1+2/w 2), M-e, M-a - goes to w 3, should be w 2
-- - solve the 2+3, middle right to bottom left problem
-- - command to iteratively swapUp/swapDown instead of directly swapping with target
-- - manageHook to draw window decos?
withWindowNavigation :: (KeySym, KeySym, KeySym, KeySym) -> XConfig l -> IO (XConfig l)
withWindowNavigation (u,l,d,r) conf =
withWindowNavigationKeys [ ((modMask conf , u), WNGo U),
((modMask conf , l), WNGo L),
((modMask conf , d), WNGo D),
((modMask conf , r), WNGo R),
((modMask conf .|. shiftMask, u), WNSwap U),
((modMask conf .|. shiftMask, l), WNSwap L),
((modMask conf .|. shiftMask, d), WNSwap D),
((modMask conf .|. shiftMask, r), WNSwap R) ]
conf
withWindowNavigationKeys :: [((KeyMask, KeySym), WNAction)] -> XConfig l -> IO (XConfig l)
withWindowNavigationKeys wnKeys conf = do
posRef <- newIORef M.empty
return conf { keys = \cnf -> M.fromList (map (second (fromWNAction posRef)) wnKeys)
`M.union` keys conf cnf,
logHook = logHook conf >> trackMovement posRef }
where fromWNAction posRef (WNGo dir) = go posRef dir
fromWNAction posRef (WNSwap dir) = swap posRef dir
data WNAction = WNGo Direction2D | WNSwap Direction2D
type WNState = Map WorkspaceId Point
-- go:
-- 1. get current position, verifying it matches the current window
-- 2. get target windowrect
-- 3. focus window
-- 4. set new position
go :: IORef WNState -> Direction2D -> X ()
go = withTargetWindow W.focusWindow
swap :: IORef WNState -> Direction2D -> X ()
swap = withTargetWindow swapWithFocused
where swapWithFocused targetWin winSet =
case W.peek winSet of
Just currentWin -> W.focusWindow currentWin $
mapWindows (swapWin currentWin targetWin) winSet
Nothing -> winSet
mapWindows f ss = W.mapWorkspace (mapWindows' f) ss
mapWindows' f ws@(W.Workspace { W.stack = s }) = ws { W.stack = mapWindows'' f <$> s }
mapWindows'' f (W.Stack focused up down) = W.Stack (f focused) (map f up) (map f down)
swapWin win1 win2 win = if win == win1 then win2 else if win == win2 then win1 else win
withTargetWindow :: (Window -> WindowSet -> WindowSet) -> IORef WNState -> Direction2D -> X ()
withTargetWindow adj posRef dir = fromCurrentPoint posRef $ \win pos -> do
targets <- filter ((/= win) . fst) <$> navigableTargets pos dir
whenJust (listToMaybe targets) $ \(targetWin, targetRect) -> do
windows (adj targetWin)
setPosition posRef pos targetRect
trackMovement :: IORef WNState -> X ()
trackMovement posRef = fromCurrentPoint posRef $ \win pos -> do
windowRect win >>= flip whenJust (setPosition posRef pos . snd)
fromCurrentPoint :: IORef WNState -> (Window -> Point -> X ()) -> X ()
fromCurrentPoint posRef f = withFocused $ \win -> do
currentPosition posRef >>= f win
-- Gets the current position from the IORef passed in, or if nothing (say, from
-- a restart), derives the current position from the current window. Also,
-- verifies that the position is congruent with the current window (say, if you
-- used mod-j/k or mouse or something).
currentPosition :: IORef WNState -> X Point
currentPosition posRef = do
root <- asks theRoot
currentWindow <- gets (W.peek . windowset)
currentRect <- maybe (Rectangle 0 0 0 0) snd <$> windowRect (fromMaybe root currentWindow)
wsid <- gets (W.currentTag . windowset)
mp <- M.lookup wsid <$> io (readIORef posRef)
return $ maybe (middleOf currentRect) (`inside` currentRect) mp
where middleOf (Rectangle x y w h) = Point (midPoint x w) (midPoint y h)
setPosition :: IORef WNState -> Point -> Rectangle -> X ()
setPosition posRef oldPos newRect = do
wsid <- gets (W.currentTag . windowset)
io $ modifyIORef posRef $ M.insert wsid (oldPos `inside` newRect)
inside :: Point -> Rectangle -> Point
Point x y `inside` Rectangle rx ry rw rh =
Point (x `within` (rx, rw)) (y `within` (ry, rh))
where pos `within` (lower, dim) = if pos >= lower && pos < lower + fromIntegral dim
then pos
else midPoint lower dim
midPoint :: Position -> Dimension -> Position
midPoint pos dim = pos + fromIntegral dim `div` 2
navigableTargets :: Point -> Direction2D -> X [(Window, Rectangle)]
navigableTargets point dir = navigable dir point <$> windowRects
-- Filters and sorts the windows in terms of what is closest from the Point in
-- the Direction2D.
navigable :: Direction2D -> Point -> [(Window, Rectangle)] -> [(Window, Rectangle)]
navigable d pt = sortby d . filter (inr d pt . snd)
-- Produces a list of normal-state windows, on any screen. Rectangles are
-- adjusted based on screen position relative to the current screen, because I'm
-- bad like that.
windowRects :: X [(Window, Rectangle)]
windowRects = fmap catMaybes . mapM windowRect . S.toList =<< gets mapped
windowRect :: Window -> X (Maybe (Window, Rectangle))
windowRect win = withDisplay $ \dpy -> do
(_, x, y, w, h, bw, _) <- io $ getGeometry dpy win
return $ Just $ (win, Rectangle x y (w + 2 * bw) (h + 2 * bw))
`catchX` return Nothing
-- Modified from droundy's implementation of WindowNavigation:
inr :: Direction2D -> Point -> Rectangle -> Bool
inr D (Point px py) (Rectangle rx ry w h) = px >= rx && px < rx + fromIntegral w &&
py < ry + fromIntegral h
inr U (Point px py) (Rectangle rx ry w _) = px >= rx && px < rx + fromIntegral w &&
py > ry
inr R (Point px py) (Rectangle rx ry _ h) = px < rx &&
py >= ry && py < ry + fromIntegral h
inr L (Point px py) (Rectangle rx ry w h) = px > rx + fromIntegral w &&
py >= ry && py < ry + fromIntegral h
sortby :: Direction2D -> [(a,Rectangle)] -> [(a,Rectangle)]
sortby D = sortBy $ comparing (rect_y . snd)
sortby R = sortBy $ comparing (rect_x . snd)
sortby U = reverse . sortby D
sortby L = reverse . sortby R
