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>Chapter 8. Events</A |
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>Table of Contents</B |
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><A |
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>Introduction</A |
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>SDL Event Structures.</A |
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>Event Functions.</A |
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>Introduction</A |
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><P |
>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 |
> |
Interally, SDL stores all the events waiting to be handled in an event queue. Using functions like <A |
HREF="sdlpollevent.html" |
><TT |
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>SDL_PollEvent</TT |
></A |
> and <A |
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><TT |
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>SDL_PeepEvents</TT |
></A |
> you can observe and handle waiting input events.</P |
><P |
>The key to event handling in SDL is the <A |
HREF="sdlevent.html" |
><SPAN |
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>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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