Layout modfier for displaying some window (monitor) above other windows

You can use this module with the following in your ~/.xmonad/xmonad.hs:

import XMonad.Layout.Monitor

Define Monitor record. monitor can be used as a template. At least prop and rect should be set here. Also consider setting persistent to True.

Minimal example:

myMonitor = monitor
    { prop = ClassName "SomeClass"
    , rect = Rectangle 0 0 40 20 -- rectangle 40x20 in upper left corner
    }

More interesting example:

clock = monitor {
     -- Cairo-clock creates 2 windows with the same classname, thus also using title
     prop = ClassName "Cairo-clock" `And` Title "MacSlow's Cairo-Clock"
     -- rectangle 150x150 in lower right corner, assuming 1280x800 resolution
   , rect = Rectangle (1280-150) (800-150) 150 150
     -- avoid flickering
   , persistent = True
     -- make the window transparent
   , opacity = 0.6
     -- hide on start
   , visible = False
     -- assign it a name to be able to toggle it independently of others
   , name = "clock"
   }

Add ManageHook to de-manage monitor windows and apply opacity settings.

manageHook = myManageHook <+> manageMonitor clock

Apply layout modifier.

myLayout = ModifiedLayout clock $ tall ||| Full ||| ...

After that, if there exists a window with specified properties, it will be displayed on top of all tiled (not floated) windows on specified position.

It's also useful to add some keybinding to toggle monitor visibility:

, ((mod1Mask, xK_u     ), broadcastMessage ToggleMonitor >> refresh)

Screenshot: http://www.haskell.org/haskellwiki/Image:Xmonad-clock.png

• This module assumes that there is only one window satisfying property exists.
• If your monitor is available on all layouts, set persistent to True to avoid unnecessary flickering. You can still toggle monitor with a keybinding.
• You can use several monitors with nested modifiers. Give them names

• make Monitor remember the window it manages
• specify position relative to the screen