content: {-# LANGUAGE FlexibleInstances, MultiParamTypeClasses #-}
  -----------------------------------------------------------------------------
  -- |
  -- Module      :  XMonad.Layout.SimpleDecoration
  -- Copyright   :  (c) 2007 Andrea Rossato
  -- License     :  BSD-style (see xmonad/LICENSE)
  --
  -- Maintainer  :  andrea.rossato@unibz.it
  -- Stability   :  unstable
  -- Portability :  unportable
  --
  -- A layout modifier for adding simple decorations to the windows of a
  -- given layout. The decorations are in the form of ion-like tabs
  -- for window titles.
  --
  -----------------------------------------------------------------------------
  
  module XMonad.Layout.SimpleDecoration
      ( -- * Usage:
        -- $usage
        simpleDeco
      , Theme (..)
      , def
      , defaultTheme
      , SimpleDecoration (..)
      , shrinkText, CustomShrink(CustomShrink)
      , Shrinker(..)
      ) where
  
  import XMonad
  import XMonad.Layout.Decoration
  
  -- $usage
  -- You can use this module with the following in your
  -- @~\/.xmonad\/xmonad.hs@:
  --
  -- > import XMonad.Layout.SimpleDecoration
  --
  -- Then edit your @layoutHook@ by adding the SimpleDecoration decoration to
  -- your layout:
  --
  -- > myL = simpleDeco shrinkText def (layoutHook def)
  -- > main = xmonad def { layoutHook = myL }
  --
  -- For more detailed instructions on editing the layoutHook see:
  --
  -- "XMonad.Doc.Extending#Editing_the_layout_hook"
  --
  -- You can also edit the default configuration options.
  --
  -- > mySDConfig = def { inactiveBorderColor = "red"
  -- >                  , inactiveTextColor   = "red"}
  --
  -- and
  --
  -- > myL = dwmStyle shrinkText mySDConfig (layoutHook def)
  
  -- | Add simple decorations to windows of a layout.
  simpleDeco :: (Eq a, Shrinker s) => s -> Theme
             -> l a -> ModifiedLayout (Decoration SimpleDecoration s) l a
  simpleDeco s c = decoration s c $ Simple True
  
  data SimpleDecoration a = Simple Bool deriving (Show, Read)
  
  instance Eq a => DecorationStyle SimpleDecoration a where
      describeDeco _ = "Simple"
      shrink (Simple b) (Rectangle _ _ _ dh) r@(Rectangle x y w h) =
          if b then Rectangle x (y + fi dh) w (h - dh) else r
      pureDecoration (Simple b) wh ht _ s _ (w,Rectangle x y wid _) =
          if isInStack s w
          then if b
               then Just $ Rectangle x  y          nwh ht
               else Just $ Rectangle x (y - fi ht) nwh ht
          else Nothing
              where nwh = min wid wh
  