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>SDL Library Documentation< /TH
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>< H1
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>< /A
>SDL_Event< /H1
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>< DIV
CLASS="REFNAMEDIV"
>< A
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NAME="AEN3711"
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>< /A
>< H2
>Name< /H2
>SDL_Event -- General event structure< /DIV
>< DIV
CLASS="REFSECT1"
>< A
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NAME="AEN3714"
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>< /A
>< H2
>Structure Definition< /H2
>< PRE
CLASS="PROGRAMLISTING"
>typedef union{
Uint8 type;
SDL_ActiveEvent active;
SDL_KeyboardEvent key;
SDL_MouseMotionEvent motion;
SDL_MouseButtonEvent button;
SDL_JoyAxisEvent jaxis;
SDL_JoyBallEvent jball;
SDL_JoyHatEvent jhat;
SDL_JoyButtonEvent jbutton;
SDL_ResizeEvent resize;
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SDL_ExposeEvent expose;
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SDL_QuitEvent quit;
SDL_UserEvent user;
SDL_SywWMEvent syswm;
} SDL_Event;< /PRE
>< /DIV
>< DIV
CLASS="REFSECT1"
>< A
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NAME="AEN3717"
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>< /A
>< H2
>Structure Data< /H2
>< DIV
CLASS="INFORMALTABLE"
>< A
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NAME="AEN3719"
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>< /A
>< P
>< /P
>< TABLE
BORDER="0"
CLASS="CALSTABLE"
>< TBODY
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="STRUCTFIELD"
>< I
>type< /I
>< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>The type of event< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="STRUCTFIELD"
>< I
>active< /I
>< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< A
HREF="sdlactiveevent.html"
>Activation event< /A
>< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="STRUCTFIELD"
>< I
>key< /I
>< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< A
HREF="sdlkeyboardevent.html"
>Keyboard event< /A
>< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="STRUCTFIELD"
>< I
>motion< /I
>< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< A
HREF="sdlmousemotionevent.html"
>Mouse motion event< /A
>< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="STRUCTFIELD"
>< I
>button< /I
>< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< A
HREF="sdlmousebuttonevent.html"
>Mouse button event< /A
>< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="STRUCTFIELD"
>< I
>jaxis< /I
>< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< A
HREF="sdljoyaxisevent.html"
>Joystick axis motion event< /A
>< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="STRUCTFIELD"
>< I
>jball< /I
>< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< A
HREF="sdljoyballevent.html"
>Joystick trackball motion event< /A
>< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="STRUCTFIELD"
>< I
>jhat< /I
>< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< A
HREF="sdljoyhatevent.html"
>Joystick hat motion event< /A
>< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="STRUCTFIELD"
>< I
>jbutton< /I
>< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< A
HREF="sdljoybuttonevent.html"
>Joystick button event< /A
>< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="STRUCTFIELD"
>< I
>resize< /I
>< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< A
HREF="sdlresizeevent.html"
>Application window resize event< /A
>< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="STRUCTFIELD"
>< I
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>expose< /I
>< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< A
HREF="sdlexposeevent.html"
>Application window expose event< /A
>< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="STRUCTFIELD"
>< I
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>quit< /I
>< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< A
HREF="sdlquitevent.html"
>Application quit request event< /A
>< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="STRUCTFIELD"
>< I
>user< /I
>< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< A
HREF="sdluserevent.html"
>User defined event< /A
>< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="STRUCTFIELD"
>< I
>syswm< /I
>< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< A
HREF="sdlsyswmevent.html"
>Undefined window manager event< /A
>< /TD
>< /TR
>< /TBODY
>< /TABLE
>< P
>< /P
>< /DIV
>< /DIV
>< DIV
CLASS="REFSECT1"
>< A
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NAME="AEN3791"
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>< /A
>< H2
>Description< /H2
>< P
>The < SPAN
CLASS="STRUCTNAME"
>SDL_Event< /SPAN
> union is the core to all event handling is SDL, its probably the most important structure after < SPAN
CLASS="STRUCTNAME"
>SDL_Surface< /SPAN
>. < SPAN
CLASS="STRUCTNAME"
>SDL_Event< /SPAN
> is a union of all event structures used in SDL, using it is a simple matter of knowing which union member relates to which event < TT
CLASS="STRUCTFIELD"
>< I
>type< /I
>< /TT
>.< /P
>< P
>< DIV
CLASS="INFORMALTABLE"
>< A
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NAME="AEN3799"
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>< /A
>< P
>< /P
>< TABLE
BORDER="1"
CLASS="CALSTABLE"
>< THEAD
>< TR
>< TH
ALIGN="LEFT"
VALIGN="TOP"
>Event < TT
CLASS="STRUCTFIELD"
>< I
>type< /I
>< /TT
>< /TH
>< TH
ALIGN="LEFT"
VALIGN="TOP"
>Event Structure< /TH
>< /TR
>< /THEAD
>< TBODY
>< TR
>< TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>< TT
CLASS="LITERAL"
>SDL_ACTIVEEVENT< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>< A
HREF="sdlactiveevent.html"
>< SPAN
CLASS="STRUCTNAME"
>SDL_ActiveEvent< /SPAN
>< /A
>< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="LITERAL"
>SDL_KEYDOWN/UP< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< A
HREF="sdlkeyboardevent.html"
>< SPAN
CLASS="STRUCTNAME"
>SDL_KeyboardEvent< /SPAN
>< /A
>< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="LITERAL"
>SDL_MOUSEMOTION< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< A
HREF="sdlmousemotionevent.html"
>< SPAN
CLASS="STRUCTNAME"
>SDL_MouseMotionEvent< /SPAN
>< /A
>< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="LITERAL"
>SDL_MOUSEBUTTONDOWN/UP< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< A
HREF="sdlmousebuttonevent.html"
>< SPAN
CLASS="STRUCTNAME"
>SDL_MouseButtonEvent< /SPAN
>< /A
>< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="LITERAL"
>SDL_JOYAXISMOTION< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< A
HREF="sdljoyaxisevent.html"
>< SPAN
CLASS="STRUCTNAME"
>SDL_JoyAxisEvent< /SPAN
>< /A
>< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="LITERAL"
>SDL_JOYBALLMOTION< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< A
HREF="sdljoyballevent.html"
>< SPAN
CLASS="STRUCTNAME"
>SDL_JoyBallEvent< /SPAN
>< /A
>< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="LITERAL"
>SDL_JOYHATMOTION< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< A
HREF="sdljoyhatevent.html"
>< SPAN
CLASS="STRUCTNAME"
>SDL_JoyHatEvent< /SPAN
>< /A
>< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="LITERAL"
>SDL_JOYBUTTONDOWN/UP< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< A
HREF="sdljoybuttonevent.html"
>< SPAN
CLASS="STRUCTNAME"
>SDL_JoyButtonEvent< /SPAN
>< /A
>< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="LITERAL"
>SDL_QUIT< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< A
HREF="sdlquitevent.html"
>< SPAN
CLASS="STRUCTNAME"
>SDL_QuitEvent< /SPAN
>< /A
>< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="LITERAL"
>SDL_SYSWMEVENT< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< A
HREF="sdlsyswmevent.html"
>< SPAN
CLASS="STRUCTNAME"
>SDL_SysWMEvent< /SPAN
>< /A
>< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="LITERAL"
>SDL_VIDEORESIZE< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< A
HREF="sdlresizeevent.html"
>< SPAN
CLASS="STRUCTNAME"
>SDL_ResizeEvent< /SPAN
>< /A
>< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="LITERAL"
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>SDL_VIDEOEXPOSE< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< A
HREF="sdlexposeevent.html"
>< SPAN
CLASS="STRUCTNAME"
>SDL_ExposeEvent< /SPAN
>< /A
>< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< TT
CLASS="LITERAL"
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>SDL_USEREVENT< /TT
>< /TD
>< TD
ALIGN="LEFT"
VALIGN="TOP"
>< A
HREF="sdluserevent.html"
>< SPAN
CLASS="STRUCTNAME"
>SDL_UserEvent< /SPAN
>< /A
>< /TD
>< /TR
>< /TBODY
>< /TABLE
>< P
>< /P
>< /DIV
>< /P
>< /DIV
>< DIV
CLASS="REFSECT1"
>< A
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NAME="AEN3885"
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>< /A
>< H2
>Use< /H2
>< P
>The < SPAN
CLASS="STRUCTNAME"
>SDL_Event< /SPAN
> structure has two uses< /P
>< P
>< /P
>< UL
COMPACT="COMPACT"
>< LI
>< P
>Reading events on the event queue< /P
>< /LI
>< LI
>< P
>Placing events on the event queue< /P
>< /LI
>< /UL
>< P
>Reading events from the event queue is done with either < A
HREF="sdlpollevent.html"
>< TT
CLASS="FUNCTION"
>SDL_PollEvent< /TT
>< /A
> or < A
HREF="sdlpeepevents.html"
>< TT
CLASS="FUNCTION"
>SDL_PeepEvents< /TT
>< /A
>. We'll use < TT
CLASS="FUNCTION"
>SDL_PollEvent< /TT
> and step through an example.< /P
>< P
>First off, we create an empty < SPAN
CLASS="STRUCTNAME"
>SDL_Event< /SPAN
> structure.
< PRE
CLASS="PROGRAMLISTING"
>SDL_Event test_event;< /PRE
>
< TT
CLASS="FUNCTION"
>SDL_PollEvent< /TT
> removes the next event from the event queue, if there are no events on the queue it returns < SPAN
CLASS="RETURNVALUE"
>0< /SPAN
> otherwise it returns < SPAN
CLASS="RETURNVALUE"
>1< /SPAN
>. We use a < TT
CLASS="FUNCTION"
>while< /TT
> loop to process each event in turn.
< PRE
CLASS="PROGRAMLISTING"
>while(SDL_PollEvent(& test_event)) {< /PRE
>
The < TT
CLASS="FUNCTION"
>SDL_PollEvent< /TT
> function take a pointer to an < SPAN
CLASS="STRUCTNAME"
>SDL_Event< /SPAN
> structure that is to be filled with event information. We know that if < TT
CLASS="FUNCTION"
>SDL_PollEvent< /TT
> removes an event from the queue then the event information will be placed in our < SPAN
CLASS="STRUCTNAME"
>test_event< /SPAN
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> structure, but we also know that the < SPAN
CLASS="emphasis"
>< I
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CLASS="EMPHASIS"
>type< /I
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>< /SPAN
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> of event will be placed in the < TT
CLASS="STRUCTFIELD"
>< I
>type< /I
>< /TT
> member of < SPAN
CLASS="STRUCTNAME"
>test_event< /SPAN
>. So to handle each event < TT
CLASS="STRUCTFIELD"
>< I
>type< /I
>< /TT
> seperately we use a < TT
CLASS="FUNCTION"
>switch< /TT
> statement.
< PRE
CLASS="PROGRAMLISTING"
> switch(test_event.type) {< /PRE
>
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We need to know what kind of events we're looking for < SPAN
CLASS="emphasis"
>< I
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CLASS="EMPHASIS"
>and< /I
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>< /SPAN
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> the event < TT
CLASS="STRUCTFIELD"
>< I
>type< /I
>< /TT
>'s of those events. So lets assume we want to detect where the user is moving the mouse pointer within our application. We look through our event types and notice that < TT
CLASS="LITERAL"
>SDL_MOUSEMOTION< /TT
> is, more than likely, the event we're looking for. A little < A
HREF="sdlmousemotionevent.html"
>more< /A
> research tells use that < TT
CLASS="LITERAL"
>SDL_MOUSEMOTION< /TT
> events are handled within the < A
HREF="sdlmousemotionevent.html"
>< SPAN
CLASS="STRUCTNAME"
>SDL_MouseMotionEvent< /SPAN
>< /A
> structure which is the < TT
CLASS="STRUCTFIELD"
>< I
>motion< /I
>< /TT
> member of < SPAN
CLASS="STRUCTNAME"
>SDL_Event< /SPAN
>. We can check for the < TT
CLASS="LITERAL"
>SDL_MOUSEMOTION< /TT
> event < TT
CLASS="STRUCTFIELD"
>< I
>type< /I
>< /TT
> within our < TT
CLASS="FUNCTION"
>switch< /TT
> statement like so:
< PRE
CLASS="PROGRAMLISTING"
> case SDL_MOUSEMOTION:< /PRE
>
All we need do now is read the information out of the < TT
CLASS="STRUCTFIELD"
>< I
>motion< /I
>< /TT
> member of < SPAN
CLASS="STRUCTNAME"
>test_event< /SPAN
>.
< PRE
CLASS="PROGRAMLISTING"
> printf("We got a motion event.\n");
printf("Current mouse position is: (%d, %d)\n", test_event.motion.x, test_event.motion.y);
break;
default:
printf("Unhandled Event!\n");
break;
}
}
printf("Event queue empty.\n");< /PRE
>< /P
>< P
>It is also possible to push events onto the event queue and so use it as a two-way communication path. Both < A
HREF="sdlpushevent.html"
>< TT
CLASS="FUNCTION"
>SDL_PushEvent< /TT
>< /A
> and < A
HREF="sdlpeepevents.html"
>< TT
CLASS="FUNCTION"
>SDL_PeepEvents< /TT
>< /A
> allow you to place events onto the event queue. This is usually used to place a < TT
CLASS="LITERAL"
>SDL_USEREVENT< /TT
> on the event queue, however you could use it to post fake input events if you wished. Creating your own events is a simple matter of choosing the event type you want, setting the < TT
CLASS="STRUCTFIELD"
>< I
>type< /I
>< /TT
> member and filling the appropriate member structure with information.
< PRE
CLASS="PROGRAMLISTING"
>SDL_Event user_event;
user_event.type=SDL_USEREVENT;
user_event.user.code=2;
user_event.user.data1=NULL;
user_event.user.data2=NULL;
SDL_PushEvent(& user_event);< /PRE
>< /P
>< /DIV
>< DIV
CLASS="REFSECT1"
>< A
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NAME="AEN3942"
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>< /A
>< H2
>See Also< /H2
>< P
>< A
HREF="sdlpollevent.html"
>< TT
CLASS="FUNCTION"
>SDL_PollEvent< /TT
>< /A
>,
< A
HREF="sdlpushevent.html"
>< TT
CLASS="FUNCTION"
>SDL_PushEvent< /TT
>< /A
>,
< A
HREF="sdlpeepevents.html"
>< TT
CLASS="FUNCTION"
>SDL_PeepEvents< /TT
>< /A
>< /P
>< /DIV
>< DIV
CLASS="NAVFOOTER"
>< HR
ALIGN="LEFT"
WIDTH="100%">< TABLE
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HREF="eventstructures.html"
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ACCESSKEY="P"
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>Prev< /A
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>< A
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>Home< /A
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>SDL Event Structures.< /TD
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>