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LayoutModifier: add pureMess and pureModifier to the LayoutModifier class

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This commit is contained in:
Andrea Rossato 2008-01-22 11:13:19 +00:00
parent a07b207023
commit efc4ad95b8
1 changed files with 7 additions and 2 deletions
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9
XMonad/Layout/LayoutModifier.hs
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@ -36,14 +36,19 @@ class (Show (m a), Read (m a)) => LayoutModifier m a where
handleMess :: m a -> SomeMessage -> X (Maybe (m a))
handleMess m mess | Just Hide <- fromMessage mess = doUnhook
| Just ReleaseResources <- fromMessage mess = doUnhook
| otherwise = return Nothing
| otherwise = return $ pureMess m mess
where doUnhook = do unhook m; return Nothing
handleMessOrMaybeModifyIt :: m a -> SomeMessage -> X (Maybe (Either (m a) SomeMessage))
handleMessOrMaybeModifyIt m mess = do mm' <- handleMess m mess
return (Left `fmap` mm')
pureMess :: m a -> SomeMessage -> Maybe (m a)
pureMess _ _ = Nothing
redoLayout :: m a -> Rectangle -> Stack a -> [(a, Rectangle)]
-> X ([(a, Rectangle)], Maybe (m a))
redoLayout m _ _ wrs = do hook m; return (wrs, Nothing)
redoLayout m r s wrs = do hook m; return $ pureModifier m r s wrs
pureModifier :: m a -> Rectangle -> Stack a -> [(a, Rectangle)]
-> ([(a, Rectangle)], Maybe (m a))
pureModifier _ _ _ wrs = (wrs, Nothing)
hook :: m a -> X ()
hook _ = return ()
unhook :: m a -> X ()