Row layout with individually resizable elements.

This module provides a layout which places all windows in a single row; the size occupied by each individual window can be increased and decreased, and a window can be set to use the whole available space whenever it has focus.

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

import XMonad.Layout.ZoomRow

and using zoomRow somewhere in your layoutHook, for example:

myLayout = zoomRow ||| Mirror zoomRow

To be able to resize windows, you can create keybindings to send the relevant ZoomMessages:

  -- Increase the size occupied by the focused window
, ((modMask .|. shifMask, xK_minus), sendMessage zoomIn)
  -- Decrease the size occupied by the focused window
, ((modMayk             , xK_minus), sendMessage zoomOut)
  -- Reset the size occupied by the focused window
, ((modMask             , xK_equal), sendMessage zoomReset)
  -- (Un)Maximize the focused window
, ((modMask             , xK_f    ), sendMessage ToggleZoomFull)

For more information on editing your layout hook and key bindings, see XMonad.Doc.Extending.

Haskell's Eq class is usually concerned with structural equality, whereas what this layout really wants is for its elements to have a unique identity, even across changes. There are cases (such as, importantly, Windows) where the Eq instance for a type actually does that, but if you want to lay out something more exotic than windows and your Eq means something else, you can use the following.