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|
{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses, TypeSynonymInstances #-}
-----------------------------------------------------------------------------
-- |
-- Module : XMonad.Layout.FixedColumn
-- Copyright : (c) 2008 Justin Bogner <mail@justinbogner.com>
-- License : BSD3-style (as xmonad)
--
-- Maintainer : Justin Bogner <mail@justinbogner.com>
-- Stability : unstable
-- Portability : unportable
--
-- A layout much like Tall, but using a multiple of a window's minimum
-- resize amount instead of a percentage of screen to decide where to
-- split. This is useful when you usually leave a text editor or
-- terminal in the master pane and like it to be 80 columns wide.
--
-----------------------------------------------------------------------------
module XMonad.Layout.FixedColumn (
-- * Usage
-- $usage
FixedColumn(..)
) where
import Control.Monad (msum)
import Data.Maybe (fromMaybe)
import Graphics.X11.Xlib (Window, rect_width)
import Graphics.X11.Xlib.Extras ( getWMNormalHints
, getWindowAttributes
, sh_base_size
, sh_resize_inc
, wa_border_width)
import XMonad.Core (X, LayoutClass(..), fromMessage, io, withDisplay)
import XMonad.Layout (Resize(..), IncMasterN(..), tile)
import XMonad.StackSet as W
-- $usage
-- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:
--
-- > import XMonad.Layout.FixedColumn
--
-- Then edit your @layoutHook@ by adding the FixedColumn layout:
--
-- > myLayout = FixedColumn 1 20 80 10 ||| Full ||| etc..
-- > main = xmonad defaultConfig { layoutHook = myLayout }
--
-- For more detailed instructions on editing the layoutHook see:
--
-- "XMonad.Doc.Extending#Editing_the_layout_hook"
-- | A tiling mode based on preserving a nice fixed width
-- window. Supports 'Shrink', 'Expand' and 'IncMasterN'.
data FixedColumn a = FixedColumn !Int -- Number of windows in the master pane
!Int -- Number to increment by when resizing
!Int -- Default width of master pane
!Int -- Column width for normal windows
deriving (Read, Show)
instance LayoutClass FixedColumn Window where
doLayout (FixedColumn nmaster _ ncol fallback) r s = do
fws <- mapM (widthCols fallback ncol) ws
let frac = maximum (take nmaster fws) // rect_width r
rs = tile frac r nmaster (length ws)
return $ (zip ws rs, Nothing)
where ws = W.integrate s
x // y = fromIntegral x / fromIntegral y
pureMessage (FixedColumn nmaster delta ncol fallback) m =
msum [fmap resize (fromMessage m)
,fmap incmastern (fromMessage m)]
where resize Shrink
= FixedColumn nmaster delta (max 0 $ ncol - delta) fallback
resize Expand
= FixedColumn nmaster delta (ncol + delta) fallback
incmastern (IncMasterN d)
= FixedColumn (max 0 (nmaster+d)) delta ncol fallback
description _ = "FixedColumn"
-- | Determine the width of @w@ given that we would like it to be @n@
-- columns wide, using @inc@ as a resize increment for windows that
-- don't have one
widthCols :: Int -> Int -> Window -> X Int
widthCols inc n w = withDisplay $ \d -> io $ do
sh <- getWMNormalHints d w
bw <- fmap (fromIntegral . wa_border_width) $ getWindowAttributes d w
let widthHint f = f sh >>= return . fromIntegral . fst
oneCol = fromMaybe inc $ widthHint sh_resize_inc
base = fromMaybe 0 $ widthHint sh_base_size
return $ 2 * bw + base + n * oneCol
|
