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{-# OPTIONS_GHC -fglasgow-exts #-}
-----------------------------------------------------------------------------
-- |
-- Module : XMonadContrib.DragPane
-- Copyright : (c) Spencer Janssen <sjanssen@cse.unl.edu>
-- David Roundy <droundy@darcs.net>,
-- License : BSD3-style (see LICENSE)
--
-- Maintainer : David Roundy <droundy@darcs.net>
-- Stability : unstable
-- Portability : unportable
--
-- Layouts that splits the screen either horizontally or vertically and
-- shows two windows. The first window is always the master window, and
-- the other is either the currently focused window or the second window in
-- layout order.
-----------------------------------------------------------------------------
module XMonadContrib.DragPane (
-- * Usage
-- $usage
dragPane, dragUpDownPane
) where
import Control.Monad.Reader ( asks )
import Graphics.X11.Xlib ( Rectangle( Rectangle ) )
import XMonad
import XMonadContrib.Decoration ( newDecoration )
import Operations ( Resize(..), splitHorizontallyBy, initColor, mouseDrag, sendMessage, mirrorRect )
import StackSet ( focus, up, down)
-- $usage
--
-- You can use this module with the following in your Config.hs file:
--
-- > import XMonadContrib.DragPane
--
-- and add, to the list of layouts:
--
-- > dragPane "" (fromRational delta) (fromRational delta)
halfHandleWidth :: Integral a => a
halfHandleWidth = 1
handleColor :: String
handleColor = "#000000"
dragPane :: String -> Double -> Double -> Layout a
dragPane = dragPane' id
dragUpDownPane :: String -> Double -> Double -> Layout a
dragUpDownPane = dragPane' mirrorRect
dragPane' :: (Rectangle -> Rectangle) -> String -> Double -> Double -> Layout a
dragPane' mirror ident delta split = Layout { doLayout = dolay, modifyLayout = return . message }
where
dolay r s = do handlec <- withDisplay $ \dpy -> io $ initColor dpy handleColor
root <- asks theRoot
let r' = mirror r
(left', right') = splitHorizontallyBy split r'
leftmost = fromIntegral $ case r' of Rectangle x _ _ _ -> x
widt = fromIntegral $ case r' of Rectangle _ _ w _ -> w
left = case left' of Rectangle x y w h ->
mirror $ Rectangle x y (w-halfHandleWidth) h
right = case right' of
Rectangle x y w h ->
mirror $ Rectangle (x+halfHandleWidth) y (w-halfHandleWidth) h
handr = case left' of
Rectangle x y w h ->
mirror $ Rectangle (x + fromIntegral w - halfHandleWidth) y (2*halfHandleWidth) h
wrs = case reverse (up s) of
(master:_) -> [(master,left),(focus s,right)]
[] -> case down s of
(next:_) -> [(focus s,left),(next,right)]
[] -> [(focus s, r)]
handle = newDecoration root handr 0 handlec handlec
"-misc-fixed-*-*-*-*-10-*-*-*-*-*-*-*"
(const $ const $ const $ const $ return ()) (doclick)
doclick = mouseDrag (\ex _ ->
sendMessage (SetFrac ident ((fromIntegral ex - leftmost)/widt)))
(return ())
ml' <- if length wrs > 1 then Just `fmap` handle (dragPane' mirror ident delta split)
else return Nothing
return (wrs, ml')
message x | Just Shrink <- fromMessage x = Just (dragPane' mirror ident delta (split - delta))
| Just Expand <- fromMessage x = Just (dragPane' mirror ident delta (split + delta))
| Just (SetFrac ident' frac) <- fromMessage x, ident' == ident =
Just (dragPane' mirror ident delta frac)
message _ = Nothing
data SetFrac = SetFrac String Double deriving ( Show, Read, Eq, Typeable )
instance Message SetFrac
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