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|
-----------------------------------------------------------------------------
-- |
-- Module : XMonadContrib.TwoPane
-- Copyright : (c) JSpencer Janssen <sjanssen@cse.unl.edu>
-- License : BSD3-style (see LICENSE)
--
-- Maintainer : Spencer Janssen <sjanssen@cse.unl.edu>
-- Stability : unstable
-- Portability : unportable
--
-- A layout that splits the screen horizontally and shows two windows. The
-- left window is always the master window, and the right is either the
-- currently focused window or the second window in layout order.
--
-----------------------------------------------------------------------------
module XMonadContrib.TwoPane (
-- * Usage
-- $usage
twoPane
) where
import XMonad
import Operations
import qualified StackSet as W
import Control.Monad.State (gets)
-- $usage
--
-- You can use this module with the following in your Config.hs file:
--
-- > import XMonadContrib.TwoPane
--
-- and add, to the list of layouts:
--
-- > twoPane defaultDelta (1%2)
twoPane :: Rational -> Rational -> Layout
twoPane delta split = Layout { doLayout = \r -> arrange r . W.integrate, modifyLayout = message }
where
arrange rect ws@(w:x:_) = do
-- TODO this is buggy, it might peek another workspace
(Just f) <- gets (W.peek . windowset) -- safe because of pattern match above
let y = if f == w then x else f
(left, right) = splitHorizontallyBy split rect
mapM_ hide . filter (\a -> a /= w && a /= y) $ ws
return [(w, left), (y, right)]
-- there are one or zero windows
arrange rect ws = return . map (\w -> (w, rect)) $ ws
message x = return $ case fromMessage x of
Just Shrink -> Just (twoPane delta (split - delta))
Just Expand -> Just (twoPane delta (split + delta))
_ -> Nothing
|
