Added messages to adjust the gap dynamically

XMonad/Layout/Spacing.hs

@@ -1,5 +1,4 @@
-{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses, DeriveDataTypeable #-}
-{-# LANGUAGE PatternGuards #-}
+{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses #-}
 
 -----------------------------------------------------------------------------
 -- |
@@ -22,12 +21,12 @@ module XMonad.Layout.Spacing (
                                spacingWithEdge, SpacingWithEdge,
                                smartSpacing, SmartSpacing,
                                smartSpacingWithEdge, SmartSpacingWithEdge,
-                               SpacingMsg(..)
+
                              ) where
 
 import Graphics.X11 (Rectangle(..))
 import Control.Arrow (second)
-import XMonad.Core (runLayout,Message,fromMessage,Typeable)
+import XMonad.Core (runLayout)
 import XMonad.StackSet (up, down, Workspace(..))
 import XMonad.Util.Font (fi)
 
@@ -50,19 +49,10 @@ spacing p = ModifiedLayout (Spacing p)
 
 data Spacing a = Spacing Int deriving (Show, Read)
 
--- | Message to dynamically increase, decrease or set the size of the window spacing
-data SpacingMsg = SetSpacing Int | IncSpacing Int deriving (Show,Read,Eq,Typeable)
-instance Message SpacingMsg
-
 instance LayoutModifier Spacing a where
 
     pureModifier (Spacing p) _ _ wrs = (map (second $ shrinkRect p) wrs, Nothing)
 
-    pureMess (Spacing px) m
-     | Just (SetSpacing px') <- fromMessage m = Just $ Spacing (max 0 px')
-     | Just (IncSpacing n)   <- fromMessage m = Just $ Spacing (max 0 (px+n))
-     | otherwise = Nothing
-
     modifierDescription (Spacing p) = "Spacing " ++ show p
 
 -- | Surround all windows by a certain number of pixels of blank space, and
@@ -76,11 +66,6 @@ instance LayoutModifier SpacingWithEdge a where
 
     pureModifier (SpacingWithEdge p) _ _ wrs = (map (second $ shrinkRect p) wrs, Nothing)
 
-    pureMess (SpacingWithEdge px) m
-     | Just (SetSpacing px') <- fromMessage m = Just $ SpacingWithEdge (max 0 px')
-     | Just (IncSpacing n)   <- fromMessage m = Just $ SpacingWithEdge (max 0 (px+n))
-     | otherwise = Nothing
-
     modifyLayout (SpacingWithEdge p) w r = runLayout w (shrinkRect p r)
 
     modifierDescription (SpacingWithEdge p) = "SpacingWithEdge " ++ show p