Make focus-follows-mouse configurable

XMonad/Config.hs

@@ -26,10 +26,12 @@ module XMonad.Config (defaultConfig) where
 --
 import XMonad.Core as XMonad hiding
     (workspaces,manageHook,numlockMask,keys,logHook,borderWidth,mouseBindings
-    ,defaultGaps,layoutHook,modMask,terminal,normalBorderColor,focusedBorderColor)
+    ,defaultGaps,layoutHook,modMask,terminal,normalBorderColor,focusedBorderColor
+    ,focusFollowsMouse)
 import qualified XMonad.Core as XMonad
     (workspaces,manageHook,numlockMask,keys,logHook,borderWidth,mouseBindings
-    ,defaultGaps,layoutHook,modMask,terminal,normalBorderColor,focusedBorderColor)
+    ,defaultGaps,layoutHook,modMask,terminal,normalBorderColor,focusedBorderColor
+    ,focusFollowsMouse)
 
 import XMonad.Layout
 import XMonad.Operations
@@ -165,6 +167,10 @@ layout = tiled ||| Mirror tiled ||| Full
 terminal :: String
 terminal = "xterm"
 
+-- | Whether focus follows the mouse pointer.
+focusFollowsMouse :: Bool
+focusFollowsMouse = True
+
 -- | The xmonad key bindings. Add, modify or remove key bindings here.
 --
 -- (The comment formatting character is used when generating the manpage)
@@ -251,4 +257,5 @@ defaultConfig = XConfig
     , XMonad.keys               = keys
     , XMonad.logHook            = logHook
     , XMonad.mouseBindings      = mouseBindings
-    , XMonad.manageHook         = manageHook }
+    , XMonad.manageHook         = manageHook
+    , XMonad.focusFollowsMouse  = focusFollowsMouse }

XMonad/Core.hs

@@ -88,6 +88,7 @@ data XConfig l = XConfig
                                                  -- ^ The mouse bindings
     , borderWidth        :: !Dimension           -- ^ The border width
     , logHook            :: !(X ())              -- ^ The action to perform when the windows set is changed
+    , focusFollowsMouse  :: !Bool                -- ^ Whether window entry events can change focus
     }
 
 

XMonad/Main.hs

@@ -194,7 +194,8 @@ handle e@(ButtonEvent {ev_window = w,ev_event_type = t,ev_button = b })
 -- entered a normal window, makes this focused.
 handle e@(CrossingEvent {ev_window = w, ev_event_type = t})
     | t == enterNotify && ev_mode   e == notifyNormal
-                       && ev_detail e /= notifyInferior = focus w
+                       && ev_detail e /= notifyInferior
+    = whenX (asks $ focusFollowsMouse . config) (focus w)
 
 -- left a window, check if we need to focus root
 handle e@(CrossingEvent {ev_event_type = t})