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+{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses #-}
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  XMonad.Layout.TabBarDecoration
+-- Copyright   :  (c) 2007 Andrea Rossato
+-- License     :  BSD-style (see xmonad/LICENSE)
+--
+-- Maintainer  :  andrea.rossato@unibz.it
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- A layout modifier to add a bar of tabs to your layouts.
+-----------------------------------------------------------------------------
+
+module XMonad.Layout.TabBarDecoration
+    ( -- * Usage
+      -- $usage
+      simpleTabBar, tabBar
+    , defaultTheme, shrinkText
+    , TabBarDecoration (..), XPPosition (..)
+    ) where
+
+import Data.List
+import XMonad
+import qualified XMonad.StackSet as S
+import XMonad.Layout.Decoration
+import XMonad.Prompt ( XPPosition (..) )
+-- $usage
+-- You can use this module with the following in your
+-- @~\/.xmonad\/xmonad.hs@:
+--
+-- > import XMonad.Layout.TabBarDecoration
+--
+-- Then edit your @layoutHook@ by adding the layout you want:
+--
+-- > main = xmonad defaultConfig { layoutHook = simpleTabBar $ layoutHook defaultConfig}
+--
+-- For more detailed instructions on editing the layoutHook see:
+--
+-- "XMonad.Doc.Extending#Editing_the_layout_hook"
+--
+-- 'tabBar' will give you the possibility of setting a custom shrinker
+-- and a custom theme.
+--
+-- The deafult theme can be dynamically change with the xmonad theme
+-- selector. See "XMonad.Prompt.Theme". For more themse, look at
+-- "XMonad.Util.Themes"
+
+simpleTabBar :: Eq a => l a -> ModifiedLayout (Decoration TabBarDecoration DefaultShrinker) l a
+simpleTabBar = decoration shrinkText defaultTheme (TabBar Top)
+
+tabBar :: (Eq a, Shrinker s) => s -> Theme -> XPPosition -> l a -> ModifiedLayout (Decoration TabBarDecoration s) l a
+tabBar s t p = decoration s t (TabBar p)
+
+data TabBarDecoration a = TabBar XPPosition deriving (Read, Show)
+
+instance Eq a => DecorationStyle TabBarDecoration a where
+    describeDeco  _ = "TabBar"
+    decorateFirst _ = True
+    shrink    _ _ r = r
+    decorationMouseDragHook _ _ _ = return ()
+    pureDecoration (TabBar p) _ dht (Rectangle x y wh ht) s _ (w,_) =
+        if isInStack s w then Just $ Rectangle nx ny nwh (fi dht) else Nothing
+        where nwh = wh `div` max 1 (fi $ length $ S.integrate s)
+              ny = case p of
+                     Top    -> y
+                     Bottom -> y + fi ht - fi dht
+              nx  = case w `elemIndex` (S.integrate s) of
+                      Just i  -> x + (fi nwh * fi i)
+                      Nothing -> x