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{-# LANGUAGE GADTs, RankNTypes, FlexibleInstances, MultiParamTypeClasses,
FlexibleContexts, UndecidableInstances, ViewPatterns, StandaloneDeriving,
RankNTypes, TupleSections #-}
{- This module provides a more powerful version of the choose layout, using a
- list to store the layouts. -}
module Internal.LayoutZipper where
import Control.Monad.Identity (runIdentity)
import Data.Maybe (fromMaybe)
import Control.Arrow (second)
import XMonad
import qualified XMonad.StackSet as W
import Data.Proxy
data LNil a = LNil deriving (Read, Show)
data LCons l t a = LCons (l a) (t a) deriving (Read, Show)
data LayoutZipper l a = LayoutZipper Int (l a)
deriving (Read, Show)
(|:) :: (LayoutSelect t a, LayoutClass l a) => l a -> t a -> LCons l t a
(|:) = LCons
infixr 5 |:
layoutZipper :: (LayoutSelect l a) => l a -> LayoutZipper l a
layoutZipper = LayoutZipper 0
nil :: LNil a
nil = LNil
data NavigateLayout =
ToNextLayout |
ToPreviousLayout |
SetLayout Int
deriving (Typeable, Show)
instance Message NavigateLayout where
class LayoutSelect l a where
update :: forall r m. (Monad m) =>
Int ->
l a ->
(forall l'. (LayoutClass l' a) => l' a -> m (r, Maybe (l' a))) ->
m (Maybe (r, l a))
nLayouts :: l a -> Int
instance (Read (l a), LayoutClass l a, LayoutSelect t a) =>
LayoutSelect (LCons l t) a where
update 0 (LCons layout t) fn = do
(r, layout') <- fn layout
return $ Just (r, LCons (fromMaybe layout layout') t)
update n (LCons l t) fn = do
(fmap . fmap) (second $ \t' -> LCons l t') $ update (n - 1) t fn
nLayouts (LCons _ t) = 1 + nLayouts t
instance LayoutSelect LNil a where
update _ _ _ = return Nothing
nLayouts _ = 0
instance (Show (l a), Typeable l, LayoutSelect l a) => LayoutClass (LayoutZipper l) a where
runLayout (W.Workspace i (LayoutZipper idx l) ms) r = do
r <- update idx l $ \layout ->
runLayout (W.Workspace i layout ms) r
case r of
Nothing -> return ([], Nothing)
Just (r, la) -> return (r, Just (LayoutZipper idx la))
pureLayout (LayoutZipper idx l) r s = runIdentity $ do
r <- update idx l $ \layout -> return (pureLayout layout r s, Nothing)
case r of
Nothing -> return []
Just (r, a) -> return r
emptyLayout (LayoutZipper idx l) r = do
r <- update idx l $ \layout -> emptyLayout layout r
case r of
Nothing -> return ([], Nothing)
Just (r, la) -> return (r, Just (LayoutZipper idx la))
handleMessage (LayoutZipper idx l) (fromMessage -> Just ToNextLayout) =
if idx < nLayouts l - 1
then return $ Just (LayoutZipper (idx + 1) l)
else return $ Just (LayoutZipper 0 l)
handleMessage (LayoutZipper idx l) (fromMessage -> Just ToPreviousLayout) =
if idx > 0
then return $ Just (LayoutZipper (idx - 1) l)
else return $ Just (LayoutZipper (nLayouts l - 1) l)
handleMessage (LayoutZipper _ l) (fromMessage -> Just (SetLayout i)) =
return $ Just $ LayoutZipper (max 0 $ min (nLayouts l - 1) $ i) l
handleMessage (LayoutZipper idx l) m = do
r <- update idx l $ \layout -> ((),) <$> handleMessage layout m
return $ LayoutZipper idx . snd <$> r
pureMessage (LayoutZipper idx l) m = runIdentity $ do
r <- update idx l $ \layout -> return ((), pureMessage layout m)
return $ LayoutZipper idx . snd <$> r
description (LayoutZipper idx l) = runIdentity $ do
r <- update idx l $ \l -> return (description l, Nothing)
return $
case r of
Nothing -> "No Layout"
Just (descr, _) -> descr
-- data LayoutZipper l a = LayoutZipper [Layout a] [Layout a]
-- deriving (Read, Show)
-- instance LayoutClass Layout a where
-- runLayout (W.Workspace i (Layout l) ms) r = do
-- (rects, new) <- runLayout (W.Workspace i l ms) r
-- return (rects, fmap Layout new)
-- doLayout (Layout l) r s = do
-- (rs, l') <- doLayout l r s
-- return (rs, fmap Layout l')
-- pureLayout (Layout l) r s = pureLayout l r s
-- emptyLayout (Layout l) = (fmap . second . fmap) Layout . emptyLayout l
-- handleMessage (Layout l) = (fmap . fmap) Layout . handleMessage l
-- pureMessage (Layout l) = fmap Layout . pureMessage l
-- description (Layout l) = description l
-- replaceHead :: LayoutZipper a -> Layout a -> LayoutZipper a
-- replaceHead (LayoutZipper (_:hs) ts) h = LayoutZipper (h:hs) ts
-- replaceHead z _ = z
--
-- nil :: LayoutZipper a
-- nil = LayoutZipper [] []
--
-- (|:) :: (Read (l a), LayoutClass l a) => l a -> LayoutZipper a -> LayoutZipper a
-- (|:) l (LayoutZipper h t) = LayoutZipper (Layout l : h) t
--
-- infixr 5 |:
--
--
--
-- instance (LayoutClass Layout a) => LayoutClass LayoutZipper a where
-- runLayout (W.Workspace i z@(LayoutZipper (a:_) _) ms) = do
-- fmap (second . fmap $ replaceHead z) .
-- runLayout (W.Workspace i a ms)
-- runLayout (W.Workspace _ z _) = emptyLayout z
--
-- doLayout z@(LayoutZipper (h:_) _) r s = do
-- (rects, mh) <- doLayout h r s
-- return (rects, fmap (replaceHead z) mh)
-- doLayout z r s = emptyLayout z r
--
-- pureLayout (LayoutZipper (h:_) _) = pureLayout h
-- pureLayout l = \_ _ -> []
--
-- emptyLayout z@(LayoutZipper (h:_) _) r = do
-- (rects, mh) <- emptyLayout h r
-- return (rects, replaceHead z <$> mh)
-- emptyLayout _ _ = return ([], Nothing)
--
-- handleMessage (LayoutZipper (hs) (t:ts)) (fromMessage -> Just ToNextLayout) =
-- return $ return $ LayoutZipper (t:hs) ts
-- handleMessage (LayoutZipper (h:hs) (ts)) (fromMessage -> Just ToPreviousLayout) =
-- return $
-- case hs of
-- [] -> Nothing
-- _ -> Just (LayoutZipper hs (h:ts))
-- handleMessage z@(LayoutZipper (h:_) _) m =
-- (fmap $ fmap $ replaceHead z) (handleMessage h m)
-- handleMessage _ _ = return Nothing
--
-- pureMessage z@(LayoutZipper (h:_) _) = fmap (replaceHead z) . pureMessage h
--
-- description (LayoutZipper (h:_) _) = description h
|
