| Portability | portable |
|---|---|
| Stability | stable |
| Maintainer | sven.panne@aedion.de |
Graphics.UI.GLUT.Begin
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.
Handling events
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.
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.
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.
Controlling the behaviour when windows are closed
data ActionOnWindowClose
The behaviour when the user closes a window.
Constructors
| Exit | Exit the whole program when any window is closed or |
| MainLoopReturns | Return from mainLoop when any window is closed. |
| ContinueExectuion | Return from mainLoop after the last window is closed. |
actionOnWindowClose :: StateVar ActionOnWindowClose
(freeglut only) Controls the behaviour when the user closes a window.