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{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses #-}
----------------------------------------------------------------------------
-- |
-- Module : XMonad.Layout.WindowSwitcherDecoration
-- Copyright : (c) Jan Vornberger 2009
-- Alejandro Serrano 2010
-- License : BSD3-style (see LICENSE)
--
-- Maintainer : jan.vornberger@informatik.uni-oldenburg.de
-- Stability : unstable
-- Portability : not portable
--
-- A decoration that allows to switch the position of windows by dragging
-- them onto each other.
--
-----------------------------------------------------------------------------
module XMonad.Layout.WindowSwitcherDecoration
( -- * Usage:
-- $usage
windowSwitcherDecoration,
windowSwitcherDecorationWithButtons,
windowSwitcherDecorationWithImageButtons
) where
import XMonad
import XMonad.Layout.Decoration
import XMonad.Layout.DecorationAddons
import XMonad.Layout.ImageButtonDecoration
import XMonad.Layout.DraggingVisualizer
import qualified XMonad.StackSet as S
import Control.Monad
import Foreign.C.Types(CInt)
-- $usage
-- You can use this module with the following in your
-- @~\/.xmonad\/xmonad.hs@:
--
-- > import XMonad.Layout.WindowSwitcherDecoration
-- > import XMonad.Layout.DraggingVisualizer
--
-- Then edit your @layoutHook@ by adding the WindowSwitcherDecoration to
-- your layout:
--
-- > myL = windowSwitcherDecoration shrinkText defaultTheme (draggingVisualizer $ layoutHook defaultConfig)
-- > main = xmonad defaultConfig { layoutHook = myL }
--
-- There is also a version of the decoration that contains buttons like
-- "XMonad.Layout.ButtonDecoration". To use that version, you will need to
-- import "XMonad.Layout.DecorationAddons" as well and modify your @layoutHook@
-- in the following way:
--
-- > import XMonad.Layout.DecorationAddons
-- >
-- > myL = windowSwitcherDecorationWithButtons shrinkText defaultThemeWithButtons (draggingVisualizer $ layoutHook defaultConfig)
-- > main = xmonad defaultConfig { layoutHook = myL }
--
-- Additionaly, there is a version of the decoration that contains image buttons like
-- "XMonad.Layout.ImageButtonDecoration". To use that version, you will need to
-- import "XMonad.Layout.ImageButtonDecoration" as well and modify your @layoutHook@
-- in the following way:
--
-- > import XMonad.Layout.ImageButtonDecoration
-- >
-- > myL = windowSwitcherDecorationWithImageButtons shrinkText defaultThemeWithImageButtons (draggingVisualizer $ layoutHook defaultConfig)
-- > main = xmonad defaultConfig { layoutHook = myL }
--
windowSwitcherDecoration :: (Eq a, Shrinker s) => s -> Theme
-> l a -> ModifiedLayout (Decoration WindowSwitcherDecoration s) l a
windowSwitcherDecoration s c = decoration s c $ WSD False
windowSwitcherDecorationWithButtons :: (Eq a, Shrinker s) => s -> Theme
-> l a -> ModifiedLayout (Decoration WindowSwitcherDecoration s) l a
windowSwitcherDecorationWithButtons s c = decoration s c $ WSD True
data WindowSwitcherDecoration a = WSD Bool deriving (Show, Read)
instance Eq a => DecorationStyle WindowSwitcherDecoration a where
describeDeco _ = "WindowSwitcherDeco"
decorationCatchClicksHook (WSD withButtons) mainw dFL dFR = if withButtons
then titleBarButtonHandler mainw dFL dFR
else return False
decorationWhileDraggingHook _ ex ey (mainw, r) x y = handleTiledDraggingInProgress ex ey (mainw, r) x y
decorationAfterDraggingHook _ (mainw, _) decoWin = do focus mainw
hasCrossed <- handleScreenCrossing mainw decoWin
unless hasCrossed $ do sendMessage $ DraggingStopped
performWindowSwitching mainw
-- Note: the image button code is duplicated from the above
-- because the title bar handle is different
windowSwitcherDecorationWithImageButtons :: (Eq a, Shrinker s) => s -> Theme
-> l a -> ModifiedLayout (Decoration ImageWindowSwitcherDecoration s) l a
windowSwitcherDecorationWithImageButtons s c = decoration s c $ IWSD True
data ImageWindowSwitcherDecoration a = IWSD Bool deriving (Show, Read)
instance Eq a => DecorationStyle ImageWindowSwitcherDecoration a where
describeDeco _ = "ImageWindowSwitcherDeco"
decorationCatchClicksHook (IWSD withButtons) mainw dFL dFR = if withButtons
then imageTitleBarButtonHandler mainw dFL dFR
else return False
decorationWhileDraggingHook _ ex ey (mainw, r) x y = handleTiledDraggingInProgress ex ey (mainw, r) x y
decorationAfterDraggingHook _ (mainw, _) decoWin = do focus mainw
hasCrossed <- handleScreenCrossing mainw decoWin
unless hasCrossed $ do sendMessage $ DraggingStopped
performWindowSwitching mainw
handleTiledDraggingInProgress :: CInt -> CInt -> (Window, Rectangle) -> Position -> Position -> X ()
handleTiledDraggingInProgress ex ey (mainw, r) x y = do
let rect = Rectangle (x - (fi ex - rect_x r))
(y - (fi ey - rect_y r))
(rect_width r)
(rect_height r)
sendMessage $ DraggingWindow mainw rect
performWindowSwitching :: Window -> X ()
performWindowSwitching win =
withDisplay $ \d -> do
root <- asks theRoot
(_, _, selWin, _, _, _, _, _) <- io $ queryPointer d root
ws <- gets windowset
let allWindows = S.index ws
-- do a little double check to be sure
if (win `elem` allWindows) && (selWin `elem` allWindows)
then do
let allWindowsSwitched = map (switchEntries win selWin) allWindows
let (ls, t:rs) = break (win ==) allWindowsSwitched
let newStack = S.Stack t (reverse ls) rs
windows $ S.modify' $ \_ -> newStack
else return ()
where
switchEntries a b x
| x == a = b
| x == b = a
| otherwise = x
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