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+{-# LANGUAGE FlexibleInstances, TypeSynonymInstances #-}
+
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  XMonad.Actions.FlexibleManipulate
+-- Copyright   :  (c) Michael Sloan
+-- License     :  BSD3-style (see LICENSE)
+-- 
+-- Maintainer  :  <mgsloan@gmail.com>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- Lets you move and resize floating windows without warping the mouse.
+--
+-----------------------------------------------------------------------------
+
+-- Based on the FlexibleResize code by Lukas Mai (Mauke)
+
+module XMonad.Actions.FlexibleManipulate (
+	-- * Usage
+	-- $usage
+	mouseWindow, discrete, linear, resize, position
+) where
+
+import XMonad
+import XMonad.Operations
+import Graphics.X11.Xlib
+import Graphics.X11.Xlib.Extras
+
+-- $usage
+-- Add this import to your Config.hs file:
+--
+-- > import qualified XMonad.Actions.FlexibleManipulate as Flex
+--
+-- Set one of the mouse button bindings up like this:
+--
+-- > mouseBindings = M.fromList
+-- >     [ ((modMask, button1), (\w -> focus w >> Flex.mouseWindow Flex.linear w)) ], ...
+--
+-- Flex.linear indicates that positions between the edges and the middle
+--    indicate a combination scale\/position.
+-- Flex.discrete indicates that there are discrete pick regions. (window
+--    is divided by thirds for each axis)
+-- Flex.resize performs only resize of the window, based on which quadrant
+--    the mouse is in
+-- Flex.position is similar to the built-in mouseMoveWindow
+--
+-- You can also write your own function for this parameter. It should take
+-- a value between 0 and 1 indicating position, and return a value indicating
+-- the corresponding position if plain Flex.linear was used.
+
+-- %import qualified XMonad.Actions.FlexibleManipulate as Flex
+-- %mousebind , ((modMask, button1), (\\w -> focus w >> Flex.mouseWindow Flex.linear w))
+
+discrete, linear, resize, position :: Double -> Double
+
+discrete x | x < 0.33 = 0
+           | x > 0.66 = 1
+           | otherwise = 0.5
+
+linear = id
+
+resize x = if x < 0.5 then 0 else 1
+position = const 0.5
+
+mouseWindow :: (Double -> Double) -> Window -> X ()
+mouseWindow f w = whenX (isClient w) $ withDisplay $ \d -> do
+    io $ raiseWindow d w
+    [wpos, wsize] <- io $ getWindowAttributes d w >>= return . winAttrs
+    sh <- io $ getWMNormalHints d w
+    pointer <- io $ queryPointer d w >>= return . pointerPos
+
+    let uv = (pointer - wpos) / wsize
+        fc = mapP f uv
+        mul = mapP (\x -> 2 - 2 * abs(x - 0.5)) fc --Fudge factors: interpolation between 1 when on edge, 2 in middle
+        atl = ((1, 1) - fc) * mul
+        abr = fc * mul
+    mouseDrag (\ex ey -> io $ do
+        let offset = (fromIntegral ex, fromIntegral ey) - pointer
+            npos = wpos + offset * atl
+            nbr = (wpos + wsize) + offset * abr
+            ntl = minP (nbr - (32, 32)) npos    --minimum size
+            nwidth = applySizeHints sh $ mapP (round :: Double -> Integer) (nbr - ntl)
+        moveResizeWindow d w (round $ fst ntl) (round $ snd ntl) `uncurry` nwidth
+        return ())
+        (float w)
+
+    float w
+    
+  where
+    pointerPos (_,_,_,px,py,_,_,_) = (fromIntegral px,fromIntegral py) :: Pnt
+    winAttrs :: WindowAttributes -> [Pnt]
+    winAttrs x = pairUp $ map (fromIntegral . ($ x)) [wa_x, wa_y, wa_width, wa_height]
+
+
+-- I'd rather I didn't have to do this, but I hate writing component 2d math
+type Pnt = (Double, Double)
+
+pairUp :: [a] -> [(a,a)]
+pairUp [] = []
+pairUp [_] = []
+pairUp (x:y:xs) = (x, y) : (pairUp xs)
+
+mapP :: (a -> b) -> (a, a) -> (b, b)
+mapP f (x, y) = (f x, f y)
+zipP :: (a -> b -> c) -> (a,a) -> (b,b) -> (c,c) 
+zipP f (ax,ay) (bx,by) = (f ax bx, f ay by)
+
+minP :: Ord a => (a,a) -> (a,a) -> (a,a)
+minP = zipP min
+
+instance Num Pnt where
+    (+) = zipP (+)
+    (-) = zipP (-)
+    (*) = zipP (*)
+    abs = mapP abs
+    signum = mapP signum
+    fromInteger = const undefined
+
+instance Fractional Pnt where
+    fromRational = const undefined
+    recip = mapP recip