 | GLUT-2.1.2.1: A binding for the OpenGL Utility Toolkit | Contents | Index |
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| Graphics.UI.GLUT.Begin | | Portability | portable | | Stability | stable | | Maintainer | sven.panne@aedion.de |
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| Description |
| After a GLUT program has done initial setup such as creating windows and
menus, GLUT programs enter the GLUT event processing loop by calling
mainLoop or handle events iteratively with mainLoopEvent.
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| Synopsis |
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| Handling events
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| mainLoop :: IO () |
| Enter the GLUT event processing loop; it will call as necessary any
callbacks that have been registered. This routine should be called at most
once in a GLUT program.
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| mainLoopEvent :: IO () |
| (freeglut only) Process one iteration's worth of events in its event loop.
This allows the application to control its own event loop and still use the
GLUT package.
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| leaveMainLoop :: IO () |
(freeglut only) Stop the event loop. If actionOnWindowClose contains
Exit, the application will exit; otherwise control will return to the
function which called mainLoop.
If the application has two nested calls to mainLoop and calls
leaveMainLoop, the behaviour is undefined. It may leave only the inner
nested loop or it may leave both loops. If the reader has a strong preference
for one behaviour over the other he should contact the freeglut Programming
Consortium and ask for the code to be fixed.
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| Controlling the behaviour when windows are closed
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| data ActionOnWindowClose |
| The behaviour when the user closes a window.
| | Constructors | | Exit | Exit the whole program when any window is closed or leaveMainLoop
is called (default).
| | MainLoopReturns | Return from mainLoop when any window is closed.
| | ContinueExectuion | Return from mainLoop after the last window is closed.
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|  Instances | |
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| actionOnWindowClose :: StateVar ActionOnWindowClose |
| (freeglut only) Controls the behaviour when the user closes a window.
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| Produced by Haddock version 2.7.2 |