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