508 lines
21 KiB
Haskell
508 lines
21 KiB
Haskell
{-# LANGUAGE PatternGuards, ParallelListComp, DeriveDataTypeable, FlexibleInstances, FlexibleContexts, MultiParamTypeClasses, TypeSynonymInstances #-}
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-----------------------------------------------------------------------------
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-- |
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-- Module : XMonad.Layout.SubLayouts
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-- Copyright : (c) 2009 Adam Vogt
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-- License : BSD-style (see xmonad/LICENSE)
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--
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-- Maintainer : vogt.adam@gmail.com
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-- Stability : unstable
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-- Portability : unportable
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--
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-- A layout combinator that allows layouts to be nested.
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--
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-- had to copy it because
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-- * uses the wrong Boring Windows library
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-----------------------------------------------------------------------------
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module SubLayouts (
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-- * Usage
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-- $usage
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subLayout,
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subTabbed,
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pushGroup, pullGroup,
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pushWindow, pullWindow,
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onGroup, toSubl, mergeDir,
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GroupMsg(..),
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Broadcast(..),
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defaultSublMap,
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Sublayout,
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-- * Screenshots
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-- $screenshots
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-- * Todo
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-- $todo
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)
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where
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import XMonad.Layout.Circle () -- so haddock can find the link
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import XMonad.Layout.Decoration(Decoration, DefaultShrinker)
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import XMonad.Layout.LayoutModifier(LayoutModifier(handleMess, modifyLayout,
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redoLayout),
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ModifiedLayout(..))
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import XMonad.Layout.Simplest(Simplest(..))
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import XMonad.Layout.Tabbed(shrinkText,
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TabbedDecoration, addTabs)
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import XMonad.Layout.WindowNavigation(Navigate(Apply))
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import XMonad.Util.Invisible(Invisible(..))
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import XMonad.Util.Types(Direction2D(..))
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import XMonad hiding (def)
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import Control.Applicative((<$>),(<*))
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import Control.Arrow(Arrow(second, (&&&)))
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import Control.Monad(MonadPlus(mplus), foldM, guard, when, join)
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import Data.Function(on)
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import Data.List(nubBy, (\\), find)
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import Data.Maybe(isNothing, fromMaybe, listToMaybe, mapMaybe)
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import Data.Traversable(sequenceA)
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import qualified BoringWindows as B
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import qualified XMonad as X
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import qualified XMonad.StackSet as W
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import qualified Data.Map as M
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import Data.Map(Map)
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-- $screenshots
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--
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-- <<http://haskell.org/sitewiki/images/thumb/8/8b/Xmonad-SubLayouts-xinerama.png/480px-Xmonad-SubLayouts-xinerama.png>>
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--
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-- Larger version: <http://haskell.org/sitewiki/images/8/8b/Xmonad-SubLayouts-xinerama.png>
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-- $todo
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-- /Issue 288/
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--
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-- "XMonad.Layout.ResizableTile" assumes that its environment
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-- contains only the windows it is running: sublayouts are currently run with
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-- the stack containing only the windows passed to it in its environment, but
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-- any changes that the layout makes are not merged back.
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--
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-- Should the behavior be made optional?
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--
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-- /Features/
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--
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-- * suggested managehooks for merging specific windows, or the apropriate
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-- layout based hack to find out the number of groups currently showed, but
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-- the size of current window groups is not available (outside of this
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-- growing module)
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--
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-- /SimpleTabbed as a SubLayout/
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--
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-- 'subTabbed' works well, but it would be more uniform to avoid the use of
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-- addTabs, with the sublayout being Simplest (but
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-- 'XMonad.Layout.Tabbed.simpleTabbed' is this...). The only thing to be
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-- gained by fixing this issue is the ability to mix and match decoration
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-- styles. Better compatibility with some other layouts of which I am not
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-- aware could be another benefit.
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--
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-- 'simpleTabbed' (and other decorated layouts) fail horribly when used as
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-- subLayouts:
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--
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-- * decorations stick around: layout is run after being told to Hide
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--
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-- * mouse events do not change focus: the group-ungroup does not respect
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-- the focus changes it wants?
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--
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-- * sending ReleaseResources before running it makes xmonad very slow, and
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-- still leaves borders sticking around
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--
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-- $usage
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-- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:
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--
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-- > import XMonad.Layout.SubLayouts
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-- > import XMonad.Layout.WindowNavigation
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--
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-- Using "XMonad.Layout.BoringWindows" is optional and it allows you to add a
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-- keybinding to skip over the non-visible windows.
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--
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-- > import XMonad.Layout.BoringWindows
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--
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-- Then edit your @layoutHook@ by adding the 'subTabbed' layout modifier:
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--
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-- > myLayout = windowNavigation $ subTabbed $ boringWindows $
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-- > Tall 1 (3/100) (1/2) ||| etc..
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-- > main = xmonad def { layoutHook = myLayout }
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--
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-- "XMonad.Layout.WindowNavigation" is used to specify which windows to merge,
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-- and it is not integrated into the modifier because it can be configured, and
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-- works best as the outer modifier.
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--
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-- Then to your keybindings add:
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--
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-- > , ((modm .|. controlMask, xK_h), sendMessage $ pullGroup L)
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-- > , ((modm .|. controlMask, xK_l), sendMessage $ pullGroup R)
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-- > , ((modm .|. controlMask, xK_k), sendMessage $ pullGroup U)
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-- > , ((modm .|. controlMask, xK_j), sendMessage $ pullGroup D)
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-- >
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-- > , ((modm .|. controlMask, xK_m), withFocused (sendMessage . MergeAll))
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-- > , ((modm .|. controlMask, xK_u), withFocused (sendMessage . UnMerge))
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-- >
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-- > , ((modm .|. controlMask, xK_period), onGroup W.focusUp')
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-- > , ((modm .|. controlMask, xK_comma), onGroup W.focusDown')
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--
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-- These additional keybindings require the optional
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-- "XMonad.Layout.BoringWindows" layoutModifier. The focus will skip over the
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-- windows that are not focused in each sublayout.
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--
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-- > , ((modm, xK_j), focusDown)
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-- > , ((modm, xK_k), focusUp)
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--
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-- A 'submap' can be used to make modifying the sublayouts using 'onGroup' and
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-- 'toSubl' simpler:
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--
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-- > ,((modm, xK_s), submap $ defaultSublMap conf)
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--
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-- /NOTE:/ is there some reason that @asks config >>= submap . defaultSublMap@
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-- could not be used in the keybinding instead? It avoids having to explicitly
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-- pass the conf.
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--
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-- For more detailed instructions, see:
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--
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-- "XMonad.Doc.Extending#Editing_the_layout_hook"
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-- "XMonad.Doc.Extending#Adding_key_bindings"
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-- | The main layout modifier arguments:
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--
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-- @subLayout advanceInnerLayouts innerLayout outerLayout@
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--
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-- [@advanceInnerLayouts@] When a new group at index @n@ in the outer layout
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-- is created (even with one element), the @innerLayout@ is used as the
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-- layout within that group after being advanced with @advanceInnerLayouts !!
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-- n@ 'NextLayout' messages. If there is no corresponding element in the
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-- @advanceInnerLayouts@ list, then @innerLayout@ is not given any 'NextLayout'
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-- messages.
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--
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-- [@innerLayout@] The single layout given to be run as a sublayout.
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--
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-- [@outerLayout@] The layout that determines the rectangles given to each
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-- group.
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--
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-- Ex. The second group is 'Tall', the third is 'Circle', all others are tabbed
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-- with:
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--
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-- > myLayout = addTabs shrinkText def
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-- > $ subLayout [0,1,2] (Simplest ||| Tall 1 0.2 0.5 ||| Circle)
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-- > $ Tall 1 0.2 0.5 ||| Full
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subLayout :: [Int] -> subl a -> l a -> ModifiedLayout (Sublayout subl) l a
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subLayout nextLayout sl x = ModifiedLayout (Sublayout (I []) (nextLayout,sl) []) x
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-- | @subTabbed@ is a use of 'subLayout' with 'addTabs' to show decorations.
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subTabbed :: (Eq a, LayoutModifier (Sublayout Simplest) a, LayoutClass l a) =>
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l a -> ModifiedLayout (Decoration TabbedDecoration DefaultShrinker)
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(ModifiedLayout (Sublayout Simplest) l) a
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subTabbed x = addTabs shrinkText X.def $ subLayout [] Simplest x
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-- | @defaultSublMap@ is an attempt to create a set of keybindings like the
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-- defaults ones but to be used as a 'submap' for sending messages to the
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-- sublayout.
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defaultSublMap :: XConfig l -> Map (KeyMask, KeySym) (X ())
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defaultSublMap (XConfig { modMask = modm }) = M.fromList
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[((modm, xK_space), toSubl NextLayout),
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((modm, xK_j), onGroup W.focusDown'),
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((modm, xK_k), onGroup W.focusUp'),
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((modm, xK_h), toSubl Shrink),
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((modm, xK_l), toSubl Expand),
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((modm, xK_Tab), onGroup W.focusDown'),
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((modm .|. shiftMask, xK_Tab), onGroup W.focusUp'),
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((modm, xK_m), onGroup focusMaster'),
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((modm, xK_comma), toSubl $ IncMasterN 1),
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((modm, xK_period), toSubl $ IncMasterN (-1)),
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((modm, xK_Return), onGroup swapMaster')
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]
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where
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-- should these go into XMonad.StackSet?
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focusMaster' st = let (f:fs) = W.integrate st
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in W.Stack f [] fs
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swapMaster' (W.Stack f u d) = W.Stack f [] $ reverse u ++ d
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data Sublayout l a = Sublayout
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{ delayMess :: Invisible [] (SomeMessage,a)
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-- ^ messages are handled when running the layout,
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-- not in the handleMessage, I'm not sure that this
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-- is necessary
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, def :: ([Int], l a) -- ^ how many NextLayout messages to send to newly
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-- populated layouts. If there is no corresponding
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-- index, then don't send any.
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, subls :: [(l a,W.Stack a)]
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-- ^ The sublayouts and the stacks they manage
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}
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deriving (Read,Show)
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-- | Groups assumes this invariant:
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-- M.keys gs == map W.focus (M.elems gs) (ignoring order)
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-- All windows in the workspace are in the Map
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--
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-- The keys are visible windows, the rest are hidden.
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--
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-- This representation probably simplifies the internals of the modifier.
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type Groups a = Map a (W.Stack a)
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-- | GroupMsg take window parameters to determine which group the action should
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-- be applied to
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data GroupMsg a
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= UnMerge a -- ^ free the focused window from its tab stack
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| UnMergeAll a
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-- ^ separate the focused group into singleton groups
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| Merge a a -- ^ merge the first group into the second group
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| MergeAll a
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-- ^ make one large group, keeping the parameter focused
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| Migrate a a
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-- ^ used to the window named in the first argument to the
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-- second argument's group, this may be replaced by a
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-- combination of 'UnMerge' and 'Merge'
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| WithGroup (W.Stack a -> X (W.Stack a)) a
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| SubMessage SomeMessage a
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-- ^ the sublayout with the given window will get the message
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deriving (Typeable)
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-- | merge the window that would be focused by the function when applied to the
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-- W.Stack of all windows, with the current group removed. The given window
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-- should be focused by a sublayout. Example usage: @withFocused (sendMessage .
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-- mergeDir W.focusDown')@
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mergeDir :: (W.Stack Window -> W.Stack Window) -> Window -> GroupMsg Window
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mergeDir f w = WithGroup g w
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where g cs = do
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let onlyOthers = W.filter (`notElem` W.integrate cs)
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flip whenJust (sendMessage . Merge (W.focus cs) . W.focus . f)
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=<< fmap (onlyOthers =<<) currentStack
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return cs
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data Broadcast = Broadcast SomeMessage -- ^ send a message to all sublayouts
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deriving (Typeable)
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instance Message Broadcast
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instance Typeable a => Message (GroupMsg a)
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-- | @pullGroup@, @pushGroup@ allow you to merge windows or groups inheriting
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-- the position of the current window (pull) or the other window (push).
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--
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-- @pushWindow@ and @pullWindow@ move individual windows between groups. They
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-- are less effective at preserving window positions.
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pullGroup,pushGroup,pullWindow,pushWindow :: Direction2D -> Navigate
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pullGroup = mergeNav (\o c -> sendMessage $ Merge o c)
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pushGroup = mergeNav (\o c -> sendMessage $ Merge c o)
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pullWindow = mergeNav (\o c -> sendMessage $ Migrate o c)
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pushWindow = mergeNav (\o c -> sendMessage $ Migrate c o)
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mergeNav :: (Window -> Window -> X ()) -> Direction2D -> Navigate
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mergeNav f = Apply (\o -> withFocused (f o))
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-- | Apply a function on the stack belonging to the currently focused group. It
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-- works for rearranging windows and for changing focus.
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onGroup :: (W.Stack Window -> W.Stack Window) -> X ()
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onGroup f = withFocused (sendMessage . WithGroup (return . f))
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-- | Send a message to the currently focused sublayout.
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toSubl :: (Message a) => a -> X ()
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toSubl m = withFocused (sendMessage . SubMessage (SomeMessage m))
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instance (Read (l Window), Show (l Window), LayoutClass l Window) => LayoutModifier (Sublayout l) Window where
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modifyLayout (Sublayout { subls = osls }) (W.Workspace i la st) r = do
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let gs' = updateGroup st $ toGroups osls
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st' = W.filter (`elem` M.keys gs') =<< st
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updateWs gs'
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oldStack <- gets $ W.stack . W.workspace . W.current . windowset
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setStack st'
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runLayout (W.Workspace i la st') r <* setStack oldStack
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-- FIXME: merge back reordering, deletions?
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redoLayout (Sublayout { delayMess = I ms, def = defl, subls = osls }) _r st arrs = do
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let gs' = updateGroup st $ toGroups osls
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sls <- fromGroups defl st gs' osls
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let newL :: LayoutClass l Window => Rectangle -> WorkspaceId -> (l Window) -> Bool
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-> (Maybe (W.Stack Window)) -> X ([(Window, Rectangle)], l Window)
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newL rect n ol isNew sst = do
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orgStack <- currentStack
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let handle l (y,_)
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| not isNew = fromMaybe l <$> handleMessage l y
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| otherwise = return l
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kms = filter ((`elem` M.keys gs') . snd) ms
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setStack sst
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nl <- foldM handle ol $ filter ((`elem` W.integrate' sst) . snd) kms
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result <- runLayout (W.Workspace n nl sst) rect
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setStack orgStack -- FIXME: merge back reordering, deletions?
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return $ fromMaybe nl `second` result
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(urls,ssts) = unzip [ (newL gr i l isNew sst, sst)
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| (isNew,(l,_st)) <- sls
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| i <- map show [ 0 :: Int .. ]
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| (k,gr) <- arrs, let sst = M.lookup k gs' ]
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arrs' <- sequence urls
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sls' <- return . Sublayout (I []) defl . map snd <$> fromGroups defl st gs'
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[ (l,s) | (_,l) <- arrs' | (Just s) <- ssts ]
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return (concatMap fst arrs', sls')
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handleMess (Sublayout (I ms) defl sls) m
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| Just (SubMessage sm w) <- fromMessage m =
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return $ Just $ Sublayout (I ((sm,w):ms)) defl sls
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| Just (Broadcast sm) <- fromMessage m = do
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ms' <- fmap (zip (repeat sm) . W.integrate') currentStack
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return $ if null ms' then Nothing
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else Just $ Sublayout (I $ ms' ++ ms) defl sls
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| Just B.UpdateBoring <- fromMessage m = do
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let bs = concatMap unfocused $ M.elems gs
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ws <- gets (W.workspace . W.current . windowset)
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flip sendMessageWithNoRefresh ws $ B.Replace "Sublayouts" bs
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return Nothing
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| Just (WithGroup f w) <- fromMessage m
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, Just g <- M.lookup w gs = do
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g' <- f g
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let gs' = M.insert (W.focus g') g' $ M.delete (W.focus g) gs
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when (gs' /= gs) $ updateWs gs'
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when (w /= W.focus g') $ windows (W.focusWindow $ W.focus g')
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return Nothing
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| Just (MergeAll w) <- fromMessage m =
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let gs' = fmap (M.singleton w)
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$ (focusWindow' w =<<) $ W.differentiate
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$ concatMap W.integrate $ M.elems gs
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in maybe (return Nothing) fgs gs'
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| Just (UnMergeAll w) <- fromMessage m =
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let ws = concatMap W.integrate $ M.elems gs
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_ = w :: Window
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mkSingleton f = M.singleton f (W.Stack f [] [])
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in fgs $ M.unions $ map mkSingleton ws
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| Just (Merge x y) <- fromMessage m
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, Just (W.Stack _ xb xn) <- findGroup x
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, Just yst <- findGroup y =
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let zs = W.Stack x xb (xn ++ W.integrate yst)
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in fgs $ M.insert x zs $ M.delete (W.focus yst) gs
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| Just (UnMerge x) <- fromMessage m =
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fgs . M.fromList . map (W.focus &&& id) . M.elems
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$ M.mapMaybe (W.filter (x/=)) gs
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-- XXX sometimes this migrates an incorrect window, why?
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| Just (Migrate x y) <- fromMessage m
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, Just xst <- findGroup x
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, Just (W.Stack yf yu yd) <- findGroup y =
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let zs = W.Stack x (yf:yu) yd
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nxsAdd = maybe id (\e -> M.insert (W.focus e) e) $ W.filter (x/=) xst
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in fgs $ nxsAdd $ M.insert x zs $ M.delete yf gs
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| otherwise = fmap join $ sequenceA $ catchLayoutMess <$> fromMessage m
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where gs = toGroups sls
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fgs gs' = do
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st <- currentStack
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Just . Sublayout (I ms) defl . map snd <$> fromGroups defl st gs' sls
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findGroup z = mplus (M.lookup z gs) $ listToMaybe
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$ M.elems $ M.filter ((z `elem`) . W.integrate) gs
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-- catchLayoutMess :: LayoutMessages -> X (Maybe (Sublayout l Window))
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-- This l must be the same as from the instance head,
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-- -XScopedTypeVariables should bring it into scope, but we are
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-- trying to avoid warnings with ghc-6.8.2 and avoid CPP
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catchLayoutMess x = do
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let m' = x `asTypeOf` (undefined :: LayoutMessages)
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ms' <- zip (repeat $ SomeMessage m') . W.integrate'
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<$> currentStack
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return $ do guard $ not $ null ms'
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Just $ Sublayout (I $ ms' ++ ms) defl sls
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currentStack :: X (Maybe (W.Stack Window))
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currentStack = gets (W.stack . W.workspace . W.current . windowset)
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-- | update Group to follow changes in the workspace
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updateGroup :: Ord a => Maybe (W.Stack a) -> Groups a -> Groups a
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updateGroup mst gs =
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let flatten = concatMap W.integrate . M.elems
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news = W.integrate' mst \\ flatten gs
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deads = flatten gs \\ W.integrate' mst
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uniNew = M.union (M.fromList $ map (\n -> (n,single n)) news)
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single x = W.Stack x [] []
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-- pass through a list to update/remove keys
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remDead = M.fromList . map (\w -> (W.focus w,w))
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. mapMaybe (W.filter (`notElem` deads)) . M.elems
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-- update the current tab group's order and focus
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followFocus hs = fromMaybe hs $ do
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f' <- W.focus `fmap` mst
|
|
xs <- find (elem f' . W.integrate) $ M.elems hs
|
|
xs' <- W.filter (`elem` W.integrate xs) =<< mst
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|
return $ M.insert f' xs' $ M.delete (W.focus xs) hs
|
|
|
|
in remDead $ uniNew $ followFocus gs
|
|
|
|
-- | rearrange the windowset to put the groups of tabs next to eachother, so
|
|
-- that the stack of tabs stays put.
|
|
updateWs :: Groups Window -> X ()
|
|
updateWs = windowsMaybe . updateWs'
|
|
|
|
updateWs' :: Groups Window -> WindowSet -> Maybe WindowSet
|
|
updateWs' gs ws = do
|
|
f <- W.peek ws
|
|
let w = W.index ws
|
|
nes = concatMap W.integrate $ mapMaybe (flip M.lookup gs) w
|
|
ws' = W.focusWindow f $ foldr W.insertUp (foldr W.delete' ws nes) nes
|
|
guard $ W.index ws' /= W.index ws
|
|
return ws'
|
|
|
|
-- | focusWindow'. focus an element of a stack, is Nothing if that element is
|
|
-- absent. See also 'W.focusWindow'
|
|
focusWindow' :: (Eq a) => a -> W.Stack a -> Maybe (W.Stack a)
|
|
focusWindow' w st = do
|
|
guard $ not $ null $ filter (w==) $ W.integrate st
|
|
if W.focus st == w then Just st
|
|
else focusWindow' w $ W.focusDown' st
|
|
|
|
-- update only when Just
|
|
windowsMaybe :: (WindowSet -> Maybe WindowSet) -> X ()
|
|
windowsMaybe f = do
|
|
xst <- get
|
|
ws <- gets windowset
|
|
let up fws = put xst { windowset = fws }
|
|
maybe (return ()) up $ f ws
|
|
|
|
unfocused :: W.Stack a -> [a]
|
|
unfocused x = W.up x ++ W.down x
|
|
|
|
toGroups :: (Ord a) => [(a1, W.Stack a)] -> Map a (W.Stack a)
|
|
toGroups ws = M.fromList . map (W.focus &&& id) . nubBy (on (==) W.focus)
|
|
$ map snd ws
|
|
|
|
-- | restore the default layout for each group. It needs the X monad to switch
|
|
-- the default layout to a specific one (handleMessage NextLayout)
|
|
fromGroups :: (LayoutClass layout a, Ord k) =>
|
|
([Int], layout a)
|
|
-> Maybe (W.Stack k)
|
|
-> Groups k
|
|
-> [(layout a, b)]
|
|
-> X [(Bool,(layout a, W.Stack k))]
|
|
fromGroups (skips,defl) st gs sls = do
|
|
defls <- mapM (iterateM nextL defl !!) skips
|
|
return $ fromGroups' defl defls st gs (map fst sls)
|
|
where nextL l = fromMaybe l <$> handleMessage l (SomeMessage NextLayout)
|
|
iterateM f = iterate (>>= f) . return
|
|
|
|
fromGroups' :: (Ord k) => a -> [a] -> Maybe (W.Stack k) -> Groups k -> [a]
|
|
-> [(Bool,(a, W.Stack k))]
|
|
fromGroups' defl defls st gs sls =
|
|
[ (isNew,fromMaybe2 (dl, single w) (l, M.lookup w gs))
|
|
| l <- map Just sls ++ repeat Nothing, let isNew = isNothing l
|
|
| dl <- defls ++ repeat defl
|
|
| w <- W.integrate' $ W.filter (`notElem` unfocs) =<< st ]
|
|
where unfocs = unfocused =<< M.elems gs
|
|
single w = W.Stack w [] []
|
|
fromMaybe2 (a,b) (x,y) = (fromMaybe a x, fromMaybe b y)
|
|
|
|
|
|
-- this would be much cleaner with some kind of data-accessor
|
|
setStack :: Maybe (W.Stack Window) -> X ()
|
|
setStack x = modify (\s -> s { windowset = (windowset s)
|
|
{ W.current = (W.current $ windowset s)
|
|
{ W.workspace = (W.workspace $ W.current $ windowset s) { W.stack = x }}}})
|