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+<HTML
+><HEAD
+><TITLE
+>Event Examples</TITLE
+><META
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+REL="HOME"
+TITLE="SDL Library Documentation"
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+TITLE="Examples"
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+TITLE="Examples"
+HREF="guideexamples.html"><LINK
+REL="NEXT"
+TITLE="Audio Examples"
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+>SDL Library Documentation</TH
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+><TR
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+><A
+HREF="guideexamples.html"
+ACCESSKEY="P"
+>Prev</A
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+><TD
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+ALIGN="center"
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+>Chapter 4. Examples</TD
+><TD
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+>Next</A
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+><HR
+ALIGN="LEFT"
+WIDTH="100%"></DIV
+><DIV
+CLASS="SECT1"
+><H1
+CLASS="SECT1"
+><A
+NAME="GUIDEEVENTEXAMPLES"
+></A
+>Event Examples</H1
+><P
+></P
+><DIV
+CLASS="SECT2"
+><H2
+CLASS="SECT2"
+><A
+NAME="AEN375"
+></A
+>Filtering and Handling Events</H2
+><P
+><PRE
+CLASS="PROGRAMLISTING"
+>#include <stdio.h>
+#include <stdlib.h>
+
+#include "SDL.h"
+
+/* This function may run in a separate event thread */
+int FilterEvents(const SDL_Event *event) {
+ static int boycott = 1;
+
+ /* This quit event signals the closing of the window */
+ if ( (event->type == SDL_QUIT) && boycott ) {
+ printf("Quit event filtered out -- try again.\n");
+ boycott = 0;
+ return(0);
+ }
+ if ( event->type == SDL_MOUSEMOTION ) {
+ printf("Mouse moved to (%d,%d)\n",
+ event->motion.x, event->motion.y);
+ return(0); /* Drop it, we've handled it */
+ }
+ return(1);
+}
+
+int main(int argc, char *argv[])
+{
+ SDL_Event event;
+
+ /* Initialize the SDL library (starts the event loop) */
+ if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
+ fprintf(stderr,
+ "Couldn't initialize SDL: %s\n", SDL_GetError());
+ exit(1);
+ }
+
+ /* Clean up on exit, exit on window close and interrupt */
+ atexit(SDL_Quit);
+
+ /* Ignore key events */
+ SDL_EventState(SDL_KEYDOWN, SDL_IGNORE);
+ SDL_EventState(SDL_KEYUP, SDL_IGNORE);
+
+ /* Filter quit and mouse motion events */
+ SDL_SetEventFilter(FilterEvents);
+
+ /* The mouse isn't much use unless we have a display for reference */
+ if ( SDL_SetVideoMode(640, 480, 8, 0) == NULL ) {
+ fprintf(stderr, "Couldn't set 640x480x8 video mode: %s\n",
+ SDL_GetError());
+ exit(1);
+ }
+
+ /* Loop waiting for ESC+Mouse_Button */
+ while ( SDL_WaitEvent(&event) >= 0 ) {
+ switch (event.type) {
+ case SDL_ACTIVEEVENT: {
+ if ( event.active.state & SDL_APPACTIVE ) {
+ if ( event.active.gain ) {
+ printf("App activated\n");
+ } else {
+ printf("App iconified\n");
+ }
+ }
+ }
+ break;
+
+ case SDL_MOUSEBUTTONDOWN: {
+ Uint8 *keys;
+
+ keys = SDL_GetKeyState(NULL);
+ if ( keys[SDLK_ESCAPE] == SDL_PRESSED ) {
+ printf("Bye bye...\n");
+ exit(0);
+ }
+ printf("Mouse button pressed\n");
+ }
+ break;
+
+ case SDL_QUIT: {
+ printf("Quit requested, quitting.\n");
+ exit(0);
+ }
+ break;
+ }
+ }
+ /* This should never happen */
+ printf("SDL_WaitEvent error: %s\n", SDL_GetError());
+ exit(1);
+}</PRE
+></P
+></DIV
+></DIV
+><DIV
+CLASS="NAVFOOTER"
+><HR
+ALIGN="LEFT"
+WIDTH="100%"><TABLE
+SUMMARY="Footer navigation table"
+WIDTH="100%"
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+WIDTH="33%"
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+HREF="guideexamples.html"
+ACCESSKEY="P"
+>Prev</A
+></TD
+><TD
+WIDTH="34%"
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+ACCESSKEY="H"
+>Home</A
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+WIDTH="33%"
+ALIGN="right"
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+>Next</A
+></TD
+></TR
+><TR
+><TD
+WIDTH="33%"
+ALIGN="left"
+VALIGN="top"
+>Examples</TD
+><TD
+WIDTH="34%"
+ALIGN="center"
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+HREF="guideexamples.html"
+ACCESSKEY="U"
+>Up</A
+></TD
+><TD
+WIDTH="33%"
+ALIGN="right"
+VALIGN="top"
+>Audio Examples</TD
+></TR
+></TABLE
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+></HTML
+>
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