{-# LANGUAGE FlexibleInstances #-}
-----------------------------------------------------------------------------
-- |
-- Module : XMonadContrib.TwoPane
-- Copyright : (c) Spencer 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 ( Resize(..), splitHorizontallyBy )
import StackSet ( focus, up, down)
-- $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", SomeLayout $ TwoPane 0.03 0.5)
-- %import XMonadContrib.TwoPane
-- %layout , ,("twopane", SomeLayout $ TwoPane 0.03 0.5)
data TwoPane a =
TwoPane Rational Rational
deriving ( Show, Read )
instance LayoutClass TwoPane a where
doLayout (TwoPane _ split) r s = return (arrange r s,Nothing)
where
arrange rect st = case reverse (up st) of
(master:_) -> [(master,left),(focus st,right)]
[] -> case down st of
(next:_) -> [(focus st,left),(next,right)]
[] -> [(focus st, rect)]
where (left, right) = splitHorizontallyBy split rect
handleMessage (TwoPane delta split) x =
return $ case fromMessage x of
Just Shrink -> Just (TwoPane delta (split - delta))
Just Expand -> Just (TwoPane delta (split + delta))
_ -> Nothing
