{-# LANGUAGE GeneralizedNewtypeDeriving, MultiParamTypeClasses, PatternGuards, TypeSynonymInstances #-}
-----------------------------------------------------------------------------
-- |
-- Module : XMonad.Actions.MouseResize
-- Copyright : (c) 2007 Andrea Rossato
-- License : BSD-style (see xmonad/LICENSE)
--
-- Maintainer : andrea.rossato@unibz.it
-- Stability : unstable
-- Portability : unportable
--
-- A layout modifier to resize windows with the mouse by grabbing the
-- window's lower right corner.
--
-- This module must be used together with "XMonad.Layout.WindowArranger".
-----------------------------------------------------------------------------
module XMonad.Actions.MouseResize
( -- * Usage:
-- $usage
mouseResize
, MouseResize (..)
) where
import Control.Monad
import Data.Maybe
import XMonad
import XMonad.Layout.Decoration
import XMonad.Layout.LayoutModifier
import XMonad.Layout.WindowArranger
import XMonad.Util.XUtils
-- $usage
-- Usually this module is used to create layouts, but you can also use
-- it to resize windows in any layout, together with the
-- "XMonad.Layout.WindowArranger". For usage example see
-- "XMonad.Layout.SimpleFloat" or "XMonad.Layout.DecorationMadness".
--
-- You can use this module with the following in your
-- @~\/.xmonad\/xmonad.hs@:
--
-- > import XMonad.Actions.MouseResize
-- > import XMonad.Layout.WindowArranger
--
-- Then edit your @layoutHook@ by modifying a given layout:
--
-- > myLayout = mouseResize $ windowArrange $ layoutHook defaultConfig
--
-- and then:
--
-- > main = xmonad defaultConfig { layoutHook = myLayout }
--
-- For more detailed instructions on editing the layoutHook see:
--
-- "XMonad.Doc.Extending#Editing_the_layout_hook"
mouseResize :: l a -> ModifiedLayout MouseResize l a
mouseResize = ModifiedLayout (MR [])
data MouseResize a = MR [((a,Rectangle),Maybe a)]
instance Show (MouseResize a) where show _ = ""
instance Read (MouseResize a) where readsPrec _ s = [(MR [], s)]
instance LayoutModifier MouseResize Window where
redoLayout _ _ Nothing wrs = return (wrs, Nothing)
redoLayout (MR st) _ (Just s) wrs
| [] <- st = initState >>= \nst -> return (wrs, Just $ MR nst)
| otherwise = processState >>= \nst -> return (wrs, Just $ MR nst)
where
wrs' = wrs_to_state [] . filter (isInStack s . fst) $ wrs
initState = mapM createInputWindow wrs'
processState = mapM (deleteInputWin . snd) st >> mapM createInputWindow wrs'
inputRectangle (Rectangle x y wh ht) = Rectangle (x + fi wh - 5) (y + fi ht - 5) 10 10
wrs_to_state rs ((w,r):xs)
| ir `isVisible` rs = ((w,r),Just ir) : wrs_to_state (r:ir:rs) xs
| otherwise = ((w,r),Nothing) : wrs_to_state (r: rs) xs
where ir = inputRectangle r
wrs_to_state _ [] = []
handleMess (MR s) m
| Just e <- fromMessage m :: Maybe Event = handleResize s e >> return Nothing
| Just Hide <- fromMessage m = releaseResources >> return (Just $ MR [])
| Just ReleaseResources <- fromMessage m = releaseResources >> return (Just $ MR [])
where releaseResources = mapM_ (deleteInputWin . snd) s
handleMess _ _ = return Nothing
handleResize :: [((Window,Rectangle),Maybe Window)] -> Event -> X ()
handleResize st ButtonEvent { ev_window = ew, ev_event_type = et }
| et == buttonPress
, Just (w,Rectangle wx wy _ _) <- getWin ew st = do
focus w
mouseDrag (\x y -> do
let rect = Rectangle wx wy
(max 1 . fi $ x - wx)
(max 1 . fi $ y - wy)
sendMessage (SetGeometry rect)) (return ())
where
getWin w (((win,r),tw):xs)
| Just w' <- tw
, w == w' = Just (win,r)
| otherwise = getWin w xs
getWin _ [] = Nothing
handleResize _ _ = return ()
createInputWindow :: ((Window,Rectangle), Maybe Rectangle) -> X ((Window,Rectangle),Maybe Window)
createInputWindow ((w,r),mr) = do
case mr of
Just tr -> withDisplay $ \d -> do
tw <- mkInputWindow d tr
io $ selectInput d tw (exposureMask .|. buttonPressMask)
showWindow tw
return ((w,r), Just tw)
Nothing -> return ((w,r), Nothing)
deleteInputWin :: Maybe Window -> X ()
deleteInputWin = maybe (return ()) deleteWindow
mkInputWindow :: Display -> Rectangle -> X Window
mkInputWindow d (Rectangle x y w h) = do
rw <- asks theRoot
let screen = defaultScreenOfDisplay d
visual = defaultVisualOfScreen screen
attrmask = cWOverrideRedirect
io $ allocaSetWindowAttributes $
\attributes -> do
set_override_redirect attributes True
createWindow d rw x y w h 0 0 inputOnly visual attrmask attributes
