    --------------------------------------------------------------------------------
    -- |
    -- Module      :  Graphics.UI.GLUT.Callbacks
    -- Copyright   :  (c) Sven Panne 2002-2018
    -- License     :  BSD3
    --
    -- Maintainer  :  Sven Panne <svenpanne@gmail.com>
    -- Stability   :  stable
    -- Portability :  portable
    --
    --
    -- GLUT supports a number of callbacks to respond to events. There are three
    -- types of callbacks: window, menu, and global. Window callbacks indicate when
    -- to redisplay or reshape a window, when the visibility of the window changes,
    -- and when input is available for the window. Menu callbacks are described in
    -- "Graphics.UI.GLUT.Menu". The global callbacks manage the passing of time and
    -- menu usage. The calling order of callbacks between different windows is
    -- undefined.
    --
    -- Callbacks for input events should be delivered to the window the event occurs
    -- in. Events should not propagate to parent windows.
    --
    -- A callback of type @Foo@ can registered by setting @fooCallback@ to 'Just'
    -- the callback. Almost all callbacks can be de-registered by setting
    -- the corresponding @fooCallback@ to 'Nothing', the only exceptions being
    -- 'Graphics.UI.GLUT.Callbacks.Window.DisplayCallback' (can only be
    -- re-registered) and 'Graphics.UI.GLUT.Callbacks.Global.TimerCallback' (can\'t
    -- be unregistered).
    --
    -- /X Implementation Notes:/ The X GLUT implementation uses the X Input
    -- extension to support sophisticated input devices: Spaceball, dial & button
    -- box, and digitizing tablet. Because the X Input extension  does not mandate
    -- how particular types of devices are advertised through the extension, it is
    -- possible GLUT for X may not correctly support input devices that would
    -- otherwise be of the correct type. The X GLUT implementation will support the
    -- Silicon Graphics Spaceball, dial & button box, and digitizing tablet as
    -- advertised through the X Input extension.
    --
    --------------------------------------------------------------------------------

    module Graphics.UI.GLUT.Callbacks (
       module Graphics.UI.GLUT.Callbacks.Window,
       module Graphics.UI.GLUT.Callbacks.Global
    ) where

    import Graphics.UI.GLUT.Callbacks.Window
    import Graphics.UI.GLUT.Callbacks.Global