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authorDavid Roundy <droundy@darcs.net>2007-09-20 19:45:29 +0200
committerDavid Roundy <droundy@darcs.net>2007-09-20 19:45:29 +0200
commit1bfe92f582721d705942b72174683e36f7f812fc (patch)
tree3f428102eb38e9971cccd233edb9c8c93d96040a
parentc76b803df04914e0883e875a86c3b8bd923bde08 (diff)
downloadxmonad-1bfe92f582721d705942b72174683e36f7f812fc.tar.gz
xmonad-1bfe92f582721d705942b72174683e36f7f812fc.tar.xz
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add Read instance to Layout.
darcs-hash:20070920174529-72aca-b1cf11419d5cccbf67edbc3a7bbb356502e9186d.gz
-rw-r--r--Operations.hs15
-rw-r--r--XMonad.hs4
2 files changed, 13 insertions, 6 deletions
diff --git a/Operations.hs b/Operations.hs
index 1b642ed..1cb0201 100644
--- a/Operations.hs
+++ b/Operations.hs
@@ -351,14 +351,14 @@ instance Message IncMasterN
-- simple fullscreen mode, just render all windows fullscreen.
-- a plea for tuple sections: map . (,sc)
-data Full a = Full deriving Show
+data Full a = Full deriving ( Show, Read )
instance Layout Full a where
doLayout Full sc (W.Stack f _ _) = return ([(f, sc)], Nothing)
modifyLayout Full _ = return Nothing -- no changes
--
-- The tiling mode of xmonad, and its operations.
--
-data Tall a = Tall Int Rational Rational deriving Show
+data Tall a = Tall Int Rational Rational deriving ( Show, Read )
instance Layout Tall a where
doLayout (Tall nmaster _ frac) r =
return . (\x->(x,Nothing)) .
@@ -375,10 +375,15 @@ mirrorRect :: Rectangle -> Rectangle
mirrorRect (Rectangle rx ry rw rh) = (Rectangle ry rx rh rw)
-- | Mirror a layout, compute its 90 degree rotated form.
-data Mirror a = forall l. Layout l a => Mirror (l a)
-instance Show (Mirror a) where
+data Mirror l a = Layout l a => Mirror (l a)
+instance Layout l a => Show (Mirror l a) where
show (Mirror l) = "Mirror "++show l
-instance Layout Mirror a where
+instance Layout l a => Read (Mirror l a) where
+ readsPrec _ s = case take (length "Mirror ") s of
+ "Mirror " -> map (\ (l,s') -> (Mirror l,s')) $ reads $ drop (length "Mirror ") s
+ _ -> []
+
+instance Layout l a => Layout (Mirror l) a where
doLayout (Mirror l) r s = do (wrs, ml') <- doLayout l (mirrorRect r) s
return (map (second mirrorRect) wrs, Mirror `fmap` ml')
modifyLayout (Mirror l) = fmap (fmap Mirror) . modifyLayout l
diff --git a/XMonad.hs b/XMonad.hs
index 56d7a00..a9253c9 100644
--- a/XMonad.hs
+++ b/XMonad.hs
@@ -134,8 +134,10 @@ atom_WM_STATE = getAtom "WM_STATE"
data SomeLayout a = forall l. Layout l a => SomeLayout (l a)
instance Show (SomeLayout a) where
show (SomeLayout l) = show l
+instance Read (SomeLayout a) where
+ readsPrec _ _ = [] -- We can't read an existential type!!!
-class Show (layout a) => Layout layout a where
+class (Show (layout a), Read (layout a)) => Layout layout a where
doLayout :: layout a -> Rectangle -> Stack a -> X ([(a, Rectangle)], Maybe (layout a))
modifyLayout :: layout a -> SomeMessage -> X (Maybe (layout a))