-----------------------------------------------------------------------------
-- |
-- Module      :  XMonad.Actions.NoBorders
-- Description :  Helper functions for dealing with window borders.
-- Copyright   :  (c) Lukas Mai
-- License     :  BSD3-style (see LICENSE)
--
-- Maintainer  :  Lukas Mai <l.mai@web.de>
-- Stability   :  stable
-- Portability :  unportable
--
-- This module provides helper functions for dealing with window borders.
--
-----------------------------------------------------------------------------

module XMonad.Actions.NoBorders (
    toggleBorder
) where

import XMonad

-- | Toggle the border of the currently focused window. To use it, add a
-- keybinding like so:
--
-- > , ((modm,  xK_g ),   withFocused toggleBorder)
--
toggleBorder :: Window -> X ()
toggleBorder :: Window -> X ()
toggleBorder Window
w = do
    Dimension
bw <- (XConf -> Dimension) -> X Dimension
forall r (m :: * -> *) a. MonadReader r m => (r -> a) -> m a
asks (XConfig Layout -> Dimension
forall (l :: * -> *). XConfig l -> Dimension
borderWidth (XConfig Layout -> Dimension)
-> (XConf -> XConfig Layout) -> XConf -> Dimension
forall b c a. (b -> c) -> (a -> b) -> a -> c
. XConf -> XConfig Layout
config)
    (Display -> X ()) -> X ()
forall a. (Display -> X a) -> X a
withDisplay ((Display -> X ()) -> X ()) -> (Display -> X ()) -> X ()
forall a b. (a -> b) -> a -> b
$ \Display
d -> IO () -> X ()
forall (m :: * -> *) a. MonadIO m => IO a -> m a
io (IO () -> X ()) -> IO () -> X ()
forall a b. (a -> b) -> a -> b
$ do
        CInt
cw <- WindowAttributes -> CInt
wa_border_width (WindowAttributes -> CInt) -> IO WindowAttributes -> IO CInt
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Display -> Window -> IO WindowAttributes
getWindowAttributes Display
d Window
w
        if CInt
cw CInt -> CInt -> Bool
forall a. Eq a => a -> a -> Bool
== CInt
0
            then Display -> Window -> Dimension -> IO ()
setWindowBorderWidth Display
d Window
w Dimension
bw
            else Display -> Window -> Dimension -> IO ()
setWindowBorderWidth Display
d Window
w Dimension
0