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| >Chapter 8. Events</H1 |
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| >SDL Event Structures.</A |
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| >Introduction</H1 |
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| >Event handling allows your application to receive input from the user. Event handling is initalised (along with video) with a call to: |
| <PRE |
| CLASS="PROGRAMLISTING" |
| >SDL_Init(SDL_INIT_VIDEO);</PRE |
| > |
| Internally, SDL stores all the events waiting to be handled in an event queue. Using functions like <A |
| HREF="sdlpollevent.html" |
| ><TT |
| CLASS="FUNCTION" |
| >SDL_PollEvent</TT |
| ></A |
| > and <A |
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| ><TT |
| CLASS="FUNCTION" |
| >SDL_PeepEvents</TT |
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| > you can observe and handle waiting input events.</P |
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| >The key to event handling in SDL is the <A |
| HREF="sdlevent.html" |
| ><SPAN |
| CLASS="STRUCTNAME" |
| >SDL_Event</SPAN |
| ></A |
| > union. The event queue itself is composed of a series of <SPAN |
| CLASS="STRUCTNAME" |
| >SDL_Event</SPAN |
| > unions, one for each waiting event. <SPAN |
| CLASS="STRUCTNAME" |
| >SDL_Event</SPAN |
| > unions are read from the queue with the <TT |
| CLASS="FUNCTION" |
| >SDL_PollEvent</TT |
| > function and it is then up to the application to process the information stored with them.</P |
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