239 lines
4.4 KiB
HTML
239 lines
4.4 KiB
HTML
<HTML
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><HEAD
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><TITLE
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>Event Examples</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.64
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"><LINK
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REL="HOME"
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TITLE="SDL Library Documentation"
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HREF="index.html"><LINK
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REL="UP"
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TITLE="Examples"
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HREF="guideexamples.html"><LINK
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REL="PREVIOUS"
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TITLE="Examples"
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HREF="guideexamples.html"><LINK
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REL="NEXT"
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TITLE="Audio Examples"
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HREF="guideaudioexamples.html"></HEAD
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><BODY
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CLASS="SECT1"
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BGCOLOR="#FFF8DC"
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TEXT="#000000"
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LINK="#0000ee"
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VLINK="#551a8b"
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ALINK="#ff0000"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>SDL Library Documentation</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="guideexamples.html"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Chapter 4. Examples</TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="guideaudioexamples.html"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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NAME="GUIDEEVENTEXAMPLES"
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>Event Examples</A
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></H1
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><P
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></P
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN375"
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>Filtering and Handling Events</A
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></H2
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><P
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><PRE
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CLASS="PROGRAMLISTING"
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>#include <stdio.h>
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#include <stdlib.h>
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#include "SDL.h"
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/* This function may run in a separate event thread */
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int FilterEvents(const SDL_Event *event) {
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static int boycott = 1;
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/* This quit event signals the closing of the window */
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if ( (event->type == SDL_QUIT) && boycott ) {
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printf("Quit event filtered out -- try again.\n");
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boycott = 0;
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return(0);
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}
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if ( event->type == SDL_MOUSEMOTION ) {
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printf("Mouse moved to (%d,%d)\n",
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event->motion.x, event->motion.y);
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return(0); /* Drop it, we've handled it */
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}
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return(1);
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}
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int main(int argc, char *argv[])
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{
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SDL_Event event;
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/* Initialize the SDL library (starts the event loop) */
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if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
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fprintf(stderr,
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"Couldn't initialize SDL: %s\n", SDL_GetError());
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exit(1);
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}
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/* Clean up on exit, exit on window close and interrupt */
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atexit(SDL_Quit);
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/* Ignore key events */
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SDL_EventState(SDL_KEYDOWN, SDL_IGNORE);
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SDL_EventState(SDL_KEYUP, SDL_IGNORE);
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/* Filter quit and mouse motion events */
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SDL_SetEventFilter(FilterEvents);
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/* The mouse isn't much use unless we have a display for reference */
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if ( SDL_SetVideoMode(640, 480, 8, 0) == NULL ) {
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fprintf(stderr, "Couldn't set 640x480x8 video mode: %s\n",
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SDL_GetError());
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exit(1);
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}
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/* Loop waiting for ESC+Mouse_Button */
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while ( SDL_WaitEvent(&event) >= 0 ) {
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switch (event.type) {
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case SDL_ACTIVEEVENT: {
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if ( event.active.state & SDL_APPACTIVE ) {
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if ( event.active.gain ) {
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printf("App activated\n");
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} else {
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printf("App iconified\n");
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}
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}
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}
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break;
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case SDL_MOUSEBUTTONDOWN: {
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Uint8 *keys;
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keys = SDL_GetKeyState(NULL);
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if ( keys[SDLK_ESCAPE] == SDL_PRESSED ) {
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printf("Bye bye...\n");
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exit(0);
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}
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printf("Mouse button pressed\n");
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}
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break;
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case SDL_QUIT: {
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printf("Quit requested, quitting.\n");
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exit(0);
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}
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break;
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}
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}
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/* This should never happen */
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printf("SDL_WaitEvent error: %s\n", SDL_GetError());
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exit(1);
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}</PRE
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></P
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></DIV
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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><A
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HREF="guideexamples.html"
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>Prev</A
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></TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="index.html"
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>Home</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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><A
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HREF="guideaudioexamples.html"
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>Next</A
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></TD
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></TR
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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>Examples</TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
|
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><A
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HREF="guideexamples.html"
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>Up</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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>Audio Examples</TD
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></TR
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></TABLE
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></DIV
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></BODY
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></HTML
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> |