-----------------------------------------------------------------------------
-- |
-- 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, splitVerticallyBy, initColor, mouseDrag, sendMessage )
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 = 2
handleColor :: String
handleColor = "#000000"
dragPane :: String -> Double -> Double -> Layout a
dragPane 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 (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 -> Rectangle x y (w-halfHandleWidth) h
right = case right' of
Rectangle x y w h -> Rectangle (x+halfHandleWidth) y (w-halfHandleWidth) h
handr = case left' of
Rectangle x y w h ->
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 ident delta split)
else return Nothing
return (wrs, ml')
message x | Just Shrink <- fromMessage x = Just (dragPane ident delta (split - delta))
| Just Expand <- fromMessage x = Just (dragPane ident delta (split + delta))
| Just (SetFrac ident' frac) <- fromMessage x, ident' == ident =
Just (dragPane ident delta frac)
message _ = Nothing
dragUpDownPane :: String -> Double -> Double -> Layout a
dragUpDownPane 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 (left', right') = splitVerticallyBy 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 -> Rectangle x y w (h-halfHandleWidth)
right = case right' of
Rectangle x y w h -> Rectangle x (y+halfHandleWidth) w (h-halfHandleWidth)
handr = case left' of
Rectangle x y w h ->
Rectangle x (y + fromIntegral h - halfHandleWidth) w (2*halfHandleWidth)
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 (\_ ey ->
sendMessage (SetFrac ident ((fromIntegral ey - leftmost)/widt)))
(return ())
ml' <- if length wrs > 1 then Just `fmap` handle (dragUpDownPane ident delta split)
else return Nothing
return (wrs, ml')
message x | Just Shrink <- fromMessage x = Just (dragUpDownPane ident delta (split - delta))
| Just Expand <- fromMessage x = Just (dragUpDownPane ident delta (split + delta))
| Just (SetFrac ident' frac) <- fromMessage x, ident' == ident =
Just (dragUpDownPane ident delta frac)
message _ = Nothing
data SetFrac = SetFrac String Double deriving ( Show, Read, Eq, Typeable )
instance Message SetFrac
