{-# OPTIONS_GHC -fglasgow-exts #-} -- For deriving Data/Typeable
{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses, PatternGuards #-}
-----------------------------------------------------------------------------
-- |
-- Module : XMonadContrib.LayoutCombinators
-- Copyright : (c) David Roundy <droundy@darcs.net>
-- License : BSD
--
-- Maintainer : David Roundy <droundy@darcs.net>
-- Stability : unstable
-- Portability : portable
--
-- A module for combining Layouts
-----------------------------------------------------------------------------
module XMonadContrib.LayoutCombinators (
-- * Usage
-- $usage
(<|>), (</>), (<||>), (<//>), (|||)
) where
import Data.Maybe ( isJust )
import XMonad
import Operations ( Tall(..), Mirror(..),
ChangeLayout(NextLayout,JumpToLayout), LayoutMessages(..) )
import XMonadContrib.Combo
import XMonadContrib.DragPane
-- $usage
-- Use LayoutCombinators to easily combine Layouts.
(<||>), (<//>) :: (Read a, Eq a, LayoutClass l1 a, LayoutClass l2 a) =>
l1 a -> l2 a -> CombineTwo DragPane l1 l2 a
(<|>) :: (Read a, Eq a, LayoutClass l1 a, LayoutClass l2 a)
=> l1 a -> l2 a -> CombineTwo Tall l1 l2 a
(</>) :: (Read a, Eq a, LayoutClass l1 a, LayoutClass l2 a)
=> l1 a -> l2 a -> CombineTwo (Mirror Tall) l1 l2 a
(<||>) = combineTwo (dragPane Vertical 0.1 0.5)
(<//>) = combineTwo (dragPane Horizontal 0.1 0.5)
(<|>) = combineTwo (Tall 1 0.1 0.5)
(</>) = combineTwo (Mirror $ Tall 1 0.1 0.5)
(|||) :: (LayoutClass l1 a, LayoutClass l2 a) => l1 a -> l2 a -> NewSelect l1 l2 a
(|||) = NewSelect True
data NewSelect l1 l2 a = NewSelect Bool (l1 a) (l2 a) deriving ( Read, Show )
data NoWrap = NextLayoutNoWrap | Wrap deriving ( Read, Show, Typeable )
instance Message NoWrap
instance (LayoutClass l1 a, LayoutClass l2 a) => LayoutClass (NewSelect l1 l2) a where
doLayout (NewSelect True l1 l2) r s = do (wrs, ml1') <- doLayout l1 r s
return (wrs, (\l1' -> NewSelect True l1' l2) `fmap` ml1')
doLayout (NewSelect False l1 l2) r s = do (wrs, ml2') <- doLayout l2 r s
return (wrs, (\l2' -> NewSelect False l1 l2') `fmap` ml2')
description (NewSelect True l1 _) = description l1
description (NewSelect False _ l2) = description l2
handleMessage (NewSelect False l1 l2) m
| Just Wrap <- fromMessage m =
do ml2' <- handleMessage l2 (SomeMessage Hide)
ml1' <- handleMessage l1 m
return $ Just $ NewSelect True (maybe l1 id ml1') (maybe l2 id ml2')
handleMessage (NewSelect True l1 l2) m
| Just NextLayoutNoWrap <- fromMessage m =
do ml1' <- handleMessage l1 m
case ml1' of
Just l1' -> return $ Just (NewSelect True l1' l2)
Nothing -> do ml1'' <- handleMessage l1 (SomeMessage Hide)
ml2' <- handleMessage l2 (SomeMessage Wrap)
return $ Just $ NewSelect False (maybe l1 id ml1'') (maybe l2 id ml2')
handleMessage l@(NewSelect True _ _) m
| Just NextLayout <- fromMessage m = handleMessage l (SomeMessage NextLayoutNoWrap)
handleMessage l@(NewSelect False l1 l2) m
| Just NextLayout <- fromMessage m =
do ml' <- handleMessage l (SomeMessage NextLayoutNoWrap)
case ml' of
Just l' -> return $ Just l'
Nothing -> do ml2' <- handleMessage l2 (SomeMessage Hide)
ml1' <- handleMessage l1 (SomeMessage Wrap)
return $ Just $ NewSelect True (maybe l1 id ml1') (maybe l2 id ml2')
handleMessage (NewSelect b l1 l2) m
| Just ReleaseResources <- fromMessage m =
do ml1' <- handleMessage l1 m
ml2' <- handleMessage l2 m
return $ if isJust ml1' || isJust ml2'
then Just $ NewSelect b (maybe l1 id ml1') (maybe l2 id ml2')
else Nothing
handleMessage (NewSelect True l1 l2) m =
do ml1' <- handleMessage l1 m
return $ (\l1' -> NewSelect True l1' l2) `fmap` ml1'
handleMessage (NewSelect False l1 l2) m =
do ml2' <- handleMessage l2 m
return $ (\l2' -> NewSelect False l1 l2') `fmap` ml2'
