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{-# LANGUAGE FlexibleContexts, FlexibleInstances, MultiParamTypeClasses, TypeSynonymInstances #-}
-----------------------------------------------------------------------------
-- |
-- Module : XMonad.Layout.MagicFocus
-- Copyright : (c) Peter De Wachter <pdewacht@gmail.com>
-- License : BSD
--
-- Maintainer : Peter De Wachter <pdewacht@gmail.com>
-- Stability : unstable
-- Portability : unportable
--
-- Automagically put the focused window in the master area.
-----------------------------------------------------------------------------
module XMonad.Layout.MagicFocus
(-- * Usage
-- $usage
magicFocus,
promoteWarp,
promoteWarp',
followOnlyIf,
disableFollowOnWS,
MagicFocus,
) where
import XMonad
import qualified XMonad.StackSet as W
import XMonad.Layout.LayoutModifier
import XMonad.Actions.UpdatePointer (updatePointer)
import Data.Monoid(All(..))
import qualified Data.Map as M
-- $usage
-- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:
--
-- > import XMonad.Layout.MagicFocus
--
-- Then edit your @layoutHook@ by adding the magicFocus layout
-- modifier:
--
-- > myLayout = magicFocus (Tall 1 (3/100) (1/2)) ||| Full ||| etc..
-- > main = xmonad def { layoutHook = myLayout,
-- > handleEventHook = promoteWarp }
--
-- For more detailed instructions on editing the layoutHook see:
--
-- "XMonad.Doc.Extending#Editing_the_layout_hook"
-- | Create a new layout which automagically puts the focused window
-- in the master area.
magicFocus :: l a -> ModifiedLayout MagicFocus l a
magicFocus = ModifiedLayout MagicFocus
data MagicFocus a = MagicFocus deriving (Show, Read)
instance LayoutModifier MagicFocus Window where
modifyLayout MagicFocus (W.Workspace i l s) r =
withWindowSet $ \wset ->
runLayout (W.Workspace i l (s >>= \st -> Just $ swap st (W.peek wset))) r
swap :: (Eq a) => W.Stack a -> Maybe a -> W.Stack a
swap (W.Stack f u d) focused
| Just f == focused = W.Stack f [] (reverse u ++ d)
| otherwise = W.Stack f u d
-- | An eventHook that overrides the normal focusFollowsMouse. When the mouse
-- it moved to another window, that window is replaced as the master, and the
-- mouse is warped to inside the new master.
--
-- It prevents infinite loops when focusFollowsMouse is true (the default), and
-- MagicFocus is in use when changing focus with the mouse.
--
-- This eventHook does nothing when there are floating windows on the current
-- workspace.
promoteWarp :: Event -> X All
promoteWarp = promoteWarp' (0.5, 0.5) (0.85, 0.85)
-- | promoteWarp' allows you to specify an arbitrary pair of arguments to
-- pass to 'updatePointer' when the mouse enters another window.
promoteWarp' :: (Rational, Rational) -> (Rational, Rational) -> Event -> X All
promoteWarp' refPos ratio e@(CrossingEvent {ev_window = w, ev_event_type = t})
| t == enterNotify && ev_mode e == notifyNormal = do
ws <- gets windowset
let foc = W.peek ws
st = W.integrate' . W.stack . W.workspace $ W.current ws
wsFloats = M.filterWithKey (\k _ -> k `elem` st) $ W.floating ws
if Just w /= foc && M.null wsFloats then do
windows (W.swapMaster . W.focusWindow w)
updatePointer refPos ratio
return $ All False
else return $ All True
promoteWarp' _ _ _ = return $ All True
-- | Another event hook to override the focusFollowsMouse and make the pointer
-- only follow if a given condition is satisfied. This could be used to disable
-- focusFollowsMouse only for given workspaces or layouts.
-- Beware that your focusFollowsMouse setting is ignored if you use this event hook.
followOnlyIf :: X Bool -> Event -> X All
followOnlyIf cond e@(CrossingEvent {ev_window = w, ev_event_type = t})
| t == enterNotify && ev_mode e == notifyNormal
= whenX cond (focus w) >> return (All False)
followOnlyIf _ _ = return $ All True
-- | Disables focusFollow on the given workspaces:
disableFollowOnWS :: [WorkspaceId] -> X Bool
disableFollowOnWS wses = (`notElem` wses) `fmap` gets (W.currentTag . windowset)
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