{-# LANGUAGE FlexibleContexts, FlexibleInstances, MultiParamTypeClasses #-}
-----------------------------------------------------------------------------
-- |
-- Module : XMonad.Layout.LayoutScreens
-- Copyright : (c) David Roundy <droundy@darcs.net>
-- License : BSD3-style (see LICENSE)
--
-- Maintainer : none
-- Stability : unstable
-- Portability : unportable
--
-- Divide a single screen into multiple screens.
-----------------------------------------------------------------------------
module XMonad.Layout.LayoutScreens (
-- * Usage
-- $usage
layoutScreens, layoutSplitScreen, fixedLayout,
FixedLayout,
) where
import XMonad
import qualified XMonad.StackSet as W
-- $usage
-- This module allows you to pretend that you have more than one screen by
-- dividing a single screen into multiple screens that xmonad will treat as
-- separate screens. This should definitely be useful for testing the
-- behavior of xmonad under Xinerama, and it's possible that it'd also be
-- handy for use as an actual user interface, if you've got a very large
-- screen and long for greater flexibility (e.g. being able to see your
-- email window at all times, a crude mimic of sticky windows).
--
-- You can use this module with the following in your
-- @~\/.xmonad\/xmonad.hs@ file:
--
-- > import XMonad.Layout.LayoutScreens
-- > import XMonad.Layout.TwoPane
--
-- Then add some keybindings; for example:
--
-- > , ((modm .|. shiftMask, xK_space), layoutScreens 2 (TwoPane 0.5 0.5))
-- > , ((modm .|. controlMask .|. shiftMask, xK_space), rescreen)
--
-- Another example use would be to handle a scenario where xrandr didn't
-- work properly (e.g. a VNC X server in my case) and you want to be able
-- to resize your screen (e.g. to match the size of a remote VNC client):
--
-- > import XMonad.Layout.LayoutScreens
--
-- > , ((modm .|. shiftMask, xK_space),
-- > layoutScreens 1 (fixedLayout [Rectangle 0 0 1024 768]))
-- > , ((modm .|. controlMask .|. shiftMask, xK_space), rescreen)
--
-- For detailed instructions on editing your key bindings, see
-- "XMonad.Doc.Extending#Editing_key_bindings".
-- | Modify all screens.
layoutScreens :: LayoutClass l Int => Int -> l Int -> X ()
layoutScreens nscr _ | nscr < 1 = trace $ "Can't layoutScreens with only " ++ show nscr ++ " screens."
layoutScreens nscr l =
do rtrect <- asks theRoot >>= getWindowRectangle
(wss, _) <- runLayout (W.Workspace "" l (Just $ W.Stack { W.focus=1, W.up=[],W.down=[1..nscr-1] })) rtrect
windows $ \ws@(W.StackSet { W.current = v, W.visible = vs, W.hidden = hs }) ->
let (x:xs, ys) = splitAt nscr $ map W.workspace (v:vs) ++ hs
s:ss = map snd wss
in ws { W.current = W.Screen x 0 (SD s)
, W.visible = zipWith3 W.Screen xs [1 ..] $ map SD ss
, W.hidden = ys }
-- | Modify current screen.
layoutSplitScreen :: LayoutClass l Int => Int -> l Int -> X ()
layoutSplitScreen nscr _ | nscr < 1 = trace $ "Can't layoutSplitScreen with only " ++ show nscr ++ " screens."
layoutSplitScreen nscr l =
do rect <- gets $ screenRect . W.screenDetail . W.current . windowset
(wss, _) <- runLayout (W.Workspace "" l (Just $ W.Stack { W.focus=1, W.up=[],W.down=[1..nscr-1] })) rect
windows $ \ws@(W.StackSet { W.current = c, W.visible = vs, W.hidden = hs }) ->
let (x:xs, ys) = splitAt nscr $ W.workspace c : hs
s:ss = map snd wss
in ws { W.current = W.Screen x (W.screen c) (SD s)
, W.visible = (zipWith3 W.Screen xs [(W.screen c+1) ..] $ map SD ss) ++
map (\v -> if W.screen v>W.screen c then v{W.screen = W.screen v + fromIntegral (nscr-1)} else v) vs
, W.hidden = ys }
getWindowRectangle :: Window -> X Rectangle
getWindowRectangle w = withDisplay $ \d ->
do a <- io $ getWindowAttributes d w
return $ Rectangle (fromIntegral $ wa_x a) (fromIntegral $ wa_y a)
(fromIntegral $ wa_width a) (fromIntegral $ wa_height a)
data FixedLayout a = FixedLayout [Rectangle] deriving (Read,Show)
instance LayoutClass FixedLayout a where
doLayout (FixedLayout rs) _ s = return (zip (W.integrate s) rs, Nothing)
fixedLayout :: [Rectangle] -> FixedLayout a
fixedLayout = FixedLayout
