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|
{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses, TypeSynonymInstances, FlexibleContexts #-}
-----------------------------------------------------------------------------
-- |
-- Module : XMonad.Layout.IM
-- Copyright : (c) Roman Cheplyaka
-- License : BSD-style (see LICENSE)
--
-- Maintainer : Roman Cheplyaka <roma@ro-che.info>
-- Stability : unstable
-- Portability : unportable
--
-- Layout suitable for workspace with multi-windowed instant messanger (like
-- Psi or Tkabber).
--
-----------------------------------------------------------------------------
module XMonad.Layout.IM (
-- * Usage
-- $usage
-- * Hints
-- $hints
-- * TODO
-- $todo
Property(..), IM(..)
) where
import XMonad
import qualified XMonad.StackSet as S
import Data.List
import XMonad.Layout (splitHorizontallyBy)
import XMonad.Layout.Grid (arrange)
import XMonad.Util.WindowProperties
-- $usage
-- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:
--
-- > import XMonad.Layout.IM
-- > import Data.Ratio ((%))
--
-- Then edit your @layoutHook@ by adding the IM layout:
--
-- > myLayouts = IM (1%7) (ClassName "Tkabber") ||| Full ||| etc..
-- > main = xmonad defaultConfig { layoutHook = myLayouts }
--
-- Here @1%7@ is the part of the screen which your roster will occupy,
-- @ClassName \"Tkabber\"@ tells xmonad which window is actually your roster.
--
-- Screenshot: <http://haskell.org/haskellwiki/Image:Xmonad-layout-im.png>
--
-- For more detailed instructions on editing the layoutHook see:
--
-- "XMonad.Doc.Extending#Editing_the_layout_hook"
-- $hints
--
-- To launch IM layout automatically on your IM workspace use "XMonad.Layout.PerWorkspace".
--
-- By default the roster window will appear on the left side.
-- To place roster window on the right side, use @reflectHoriz@ from
-- "XMonad.Layout.Reflect" module.
-- $todo
-- All these items are questionable. Please let me know if you find them useful.
--
-- * shrink\/expand
--
-- * use arbitrary layout instead of grid
data IM a = IM Rational Property deriving (Read, Show)
instance LayoutClass IM Window where
description _ = "IM"
doLayout (IM r prop) rect stack = do
let ws = S.integrate stack
let (masterRect, slaveRect) = splitHorizontallyBy r rect
master <- findM (hasProperty prop) ws
let positions = case master of
Just w -> (w, masterRect) : arrange slaveRect (filter (w /=) ws)
Nothing -> arrange rect ws
return (positions, Nothing)
-- | Like find, but works with monadic computation instead of pure function.
findM :: Monad m => (a-> m Bool) -> [a] -> m (Maybe a)
findM _ [] = return Nothing
findM f (x:xs) = do { b <- f x; if b then return (Just x) else findM f xs }
|
