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-- Maintainer: Spencer Janssen <sjanssen@cse.unl.edu>
--
-- 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.
--
-- To use this layout, 'import XMonadContrib.TwoPane' and add
-- 'twoPane defaultDelta (1%2)' to the list of layouts
module XMonadContrib.TwoPane where
import XMonad
import Operations
import qualified StackSet as W
import Control.Monad.State (gets)
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
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