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<title>Graphics/UI/GLUT/Callbacks.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-2"></a><span class='hs-comment'>-- |</span>
<a name="line-3"></a><span class='hs-comment'>-- Module : Graphics.UI.GLUT.Callbacks</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright : (c) Sven Panne 2002-2005</span>
<a name="line-5"></a><span class='hs-comment'>-- License : BSD-style (see the file libraries/GLUT/LICENSE)</span>
<a name="line-6"></a><span class='hs-comment'>--</span>
<a name="line-7"></a><span class='hs-comment'>-- Maintainer : sven.panne@aedion.de</span>
<a name="line-8"></a><span class='hs-comment'>-- Stability : stable</span>
<a name="line-9"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-10"></a><span class='hs-comment'>--</span>
<a name="line-11"></a><span class='hs-comment'>--</span>
<a name="line-12"></a><span class='hs-comment'>-- GLUT supports a number of callbacks to respond to events. There are three</span>
<a name="line-13"></a><span class='hs-comment'>-- types of callbacks: window, menu, and global. Window callbacks indicate when</span>
<a name="line-14"></a><span class='hs-comment'>-- to redisplay or reshape a window, when the visibility of the window changes,</span>
<a name="line-15"></a><span class='hs-comment'>-- and when input is available for the window. Menu callbacks are described in</span>
<a name="line-16"></a><span class='hs-comment'>-- "Graphics.UI.GLUT.Menu". The global callbacks manage the passing of time and</span>
<a name="line-17"></a><span class='hs-comment'>-- menu usage. The calling order of callbacks between different windows is</span>
<a name="line-18"></a><span class='hs-comment'>-- undefined.</span>
<a name="line-19"></a><span class='hs-comment'>--</span>
<a name="line-20"></a><span class='hs-comment'>-- Callbacks for input events should be delivered to the window the event occurs</span>
<a name="line-21"></a><span class='hs-comment'>-- in. Events should not propagate to parent windows.</span>
<a name="line-22"></a><span class='hs-comment'>--</span>
<a name="line-23"></a><span class='hs-comment'>-- A callback of type @Foo@ can registered by setting @fooCallback@ to 'Just'</span>
<a name="line-24"></a><span class='hs-comment'>-- the callback. Almost all callbacks can be de-registered by setting</span>
<a name="line-25"></a><span class='hs-comment'>-- the corresponding @fooCallback@ to 'Nothing', the only exceptions being</span>
<a name="line-26"></a><span class='hs-comment'>-- 'Graphics.UI.GLUT.Callbacks.Window.DisplayCallback' (can only be</span>
<a name="line-27"></a><span class='hs-comment'>-- re-registered) and 'Graphics.UI.GLUT.Callbacks.Global.TimerCallback' (can\'t</span>
<a name="line-28"></a><span class='hs-comment'>-- be unregistered).</span>
<a name="line-29"></a><span class='hs-comment'>--</span>
<a name="line-30"></a><span class='hs-comment'>-- /X Implementation Notes:/ The X GLUT implementation uses the X Input</span>
<a name="line-31"></a><span class='hs-comment'>-- extension to support sophisticated input devices: Spaceball, dial & button</span>
<a name="line-32"></a><span class='hs-comment'>-- box, and digitizing tablet. Because the X Input extension does not mandate</span>
<a name="line-33"></a><span class='hs-comment'>-- how particular types of devices are advertised through the extension, it is</span>
<a name="line-34"></a><span class='hs-comment'>-- possible GLUT for X may not correctly support input devices that would</span>
<a name="line-35"></a><span class='hs-comment'>-- otherwise be of the correct type. The X GLUT implementation will support the</span>
<a name="line-36"></a><span class='hs-comment'>-- Silicon Graphics Spaceball, dial & button box, and digitizing tablet as</span>
<a name="line-37"></a><span class='hs-comment'>-- advertised through the X Input extension.</span>
<a name="line-38"></a><span class='hs-comment'>--</span>
<a name="line-39"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-40"></a>
<a name="line-41"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>UI</span><span class='hs-varop'>.</span><span class='hs-conid'>GLUT</span><span class='hs-varop'>.</span><span class='hs-conid'>Callbacks</span> <span class='hs-layout'>(</span>
<a name="line-42"></a> <span class='hs-keyword'>module</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>UI</span><span class='hs-varop'>.</span><span class='hs-conid'>GLUT</span><span class='hs-varop'>.</span><span class='hs-conid'>Callbacks</span><span class='hs-varop'>.</span><span class='hs-conid'>Window</span><span class='hs-layout'>,</span>
<a name="line-43"></a> <span class='hs-keyword'>module</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>UI</span><span class='hs-varop'>.</span><span class='hs-conid'>GLUT</span><span class='hs-varop'>.</span><span class='hs-conid'>Callbacks</span><span class='hs-varop'>.</span><span class='hs-conid'>Global</span>
<a name="line-44"></a><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-45"></a>
<a name="line-46"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>UI</span><span class='hs-varop'>.</span><span class='hs-conid'>GLUT</span><span class='hs-varop'>.</span><span class='hs-conid'>Callbacks</span><span class='hs-varop'>.</span><span class='hs-conid'>Window</span>
<a name="line-47"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>UI</span><span class='hs-varop'>.</span><span class='hs-conid'>GLUT</span><span class='hs-varop'>.</span><span class='hs-conid'>Callbacks</span><span class='hs-varop'>.</span><span class='hs-conid'>Global</span>
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