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annotate docs/html/guideeventexamples.html @ 2173:26233707bc94
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 11 Jul 2007 14:51:49 +0000 |
| parents | 355632dca928 |
| children |
| rev | line source |
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| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >Event Examples</TITLE | |
| 5 ><META | |
| 6 NAME="GENERATOR" | |
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ |
| 0 | 8 "><LINK |
| 9 REL="HOME" | |
| 10 TITLE="SDL Library Documentation" | |
| 11 HREF="index.html"><LINK | |
| 12 REL="UP" | |
| 13 TITLE="Examples" | |
| 14 HREF="guideexamples.html"><LINK | |
| 15 REL="PREVIOUS" | |
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16 TITLE="Examples" |
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17 HREF="guideexamples.html"><LINK |
| 0 | 18 REL="NEXT" |
| 19 TITLE="Audio Examples" | |
| 20 HREF="guideaudioexamples.html"></HEAD | |
| 21 ><BODY | |
| 22 CLASS="SECT1" | |
| 23 BGCOLOR="#FFF8DC" | |
| 24 TEXT="#000000" | |
| 25 LINK="#0000ee" | |
| 26 VLINK="#551a8b" | |
| 27 ALINK="#ff0000" | |
| 28 ><DIV | |
| 29 CLASS="NAVHEADER" | |
| 30 ><TABLE | |
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31 SUMMARY="Header navigation table" |
| 0 | 32 WIDTH="100%" |
| 33 BORDER="0" | |
| 34 CELLPADDING="0" | |
| 35 CELLSPACING="0" | |
| 36 ><TR | |
| 37 ><TH | |
| 38 COLSPAN="3" | |
| 39 ALIGN="center" | |
| 40 >SDL Library Documentation</TH | |
| 41 ></TR | |
| 42 ><TR | |
| 43 ><TD | |
| 44 WIDTH="10%" | |
| 45 ALIGN="left" | |
| 46 VALIGN="bottom" | |
| 47 ><A | |
|
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48 HREF="guideexamples.html" |
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49 ACCESSKEY="P" |
| 0 | 50 >Prev</A |
| 51 ></TD | |
| 52 ><TD | |
| 53 WIDTH="80%" | |
| 54 ALIGN="center" | |
| 55 VALIGN="bottom" | |
| 56 >Chapter 4. Examples</TD | |
| 57 ><TD | |
| 58 WIDTH="10%" | |
| 59 ALIGN="right" | |
| 60 VALIGN="bottom" | |
| 61 ><A | |
| 62 HREF="guideaudioexamples.html" | |
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63 ACCESSKEY="N" |
| 0 | 64 >Next</A |
| 65 ></TD | |
| 66 ></TR | |
| 67 ></TABLE | |
| 68 ><HR | |
| 69 ALIGN="LEFT" | |
| 70 WIDTH="100%"></DIV | |
| 71 ><DIV | |
| 72 CLASS="SECT1" | |
| 73 ><H1 | |
| 74 CLASS="SECT1" | |
| 75 ><A | |
| 76 NAME="GUIDEEVENTEXAMPLES" | |
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77 ></A |
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78 >Event Examples</H1 |
| 0 | 79 ><P |
| 80 ></P | |
| 81 ><DIV | |
| 82 CLASS="SECT2" | |
| 83 ><H2 | |
| 84 CLASS="SECT2" | |
| 85 ><A | |
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86 NAME="AEN375" |
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87 ></A |
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88 >Filtering and Handling Events</H2 |
| 0 | 89 ><P |
| 90 ><PRE | |
| 91 CLASS="PROGRAMLISTING" | |
| 92 >#include <stdio.h> | |
| 93 #include <stdlib.h> | |
| 94 | |
| 95 #include "SDL.h" | |
| 96 | |
| 97 /* This function may run in a separate event thread */ | |
| 98 int FilterEvents(const SDL_Event *event) { | |
| 99 static int boycott = 1; | |
| 100 | |
| 101 /* This quit event signals the closing of the window */ | |
| 102 if ( (event->type == SDL_QUIT) && boycott ) { | |
| 103 printf("Quit event filtered out -- try again.\n"); | |
| 104 boycott = 0; | |
| 105 return(0); | |
| 106 } | |
| 107 if ( event->type == SDL_MOUSEMOTION ) { | |
| 108 printf("Mouse moved to (%d,%d)\n", | |
| 109 event->motion.x, event->motion.y); | |
| 110 return(0); /* Drop it, we've handled it */ | |
| 111 } | |
| 112 return(1); | |
| 113 } | |
| 114 | |
| 115 int main(int argc, char *argv[]) | |
| 116 { | |
| 117 SDL_Event event; | |
| 118 | |
| 119 /* Initialize the SDL library (starts the event loop) */ | |
| 120 if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) { | |
| 121 fprintf(stderr, | |
| 122 "Couldn't initialize SDL: %s\n", SDL_GetError()); | |
| 123 exit(1); | |
| 124 } | |
| 125 | |
| 126 /* Clean up on exit, exit on window close and interrupt */ | |
| 127 atexit(SDL_Quit); | |
| 128 | |
| 129 /* Ignore key events */ | |
| 130 SDL_EventState(SDL_KEYDOWN, SDL_IGNORE); | |
| 131 SDL_EventState(SDL_KEYUP, SDL_IGNORE); | |
| 132 | |
| 133 /* Filter quit and mouse motion events */ | |
| 134 SDL_SetEventFilter(FilterEvents); | |
| 135 | |
| 136 /* The mouse isn't much use unless we have a display for reference */ | |
| 137 if ( SDL_SetVideoMode(640, 480, 8, 0) == NULL ) { | |
| 138 fprintf(stderr, "Couldn't set 640x480x8 video mode: %s\n", | |
| 139 SDL_GetError()); | |
| 140 exit(1); | |
| 141 } | |
| 142 | |
| 143 /* Loop waiting for ESC+Mouse_Button */ | |
| 144 while ( SDL_WaitEvent(&event) >= 0 ) { | |
| 145 switch (event.type) { | |
| 146 case SDL_ACTIVEEVENT: { | |
| 147 if ( event.active.state & SDL_APPACTIVE ) { | |
| 148 if ( event.active.gain ) { | |
| 149 printf("App activated\n"); | |
| 150 } else { | |
| 151 printf("App iconified\n"); | |
| 152 } | |
| 153 } | |
| 154 } | |
| 155 break; | |
| 156 | |
| 157 case SDL_MOUSEBUTTONDOWN: { | |
| 158 Uint8 *keys; | |
| 159 | |
| 160 keys = SDL_GetKeyState(NULL); | |
| 161 if ( keys[SDLK_ESCAPE] == SDL_PRESSED ) { | |
| 162 printf("Bye bye...\n"); | |
| 163 exit(0); | |
| 164 } | |
| 165 printf("Mouse button pressed\n"); | |
| 166 } | |
| 167 break; | |
| 168 | |
| 169 case SDL_QUIT: { | |
| 170 printf("Quit requested, quitting.\n"); | |
| 171 exit(0); | |
| 172 } | |
| 173 break; | |
| 174 } | |
| 175 } | |
| 176 /* This should never happen */ | |
| 177 printf("SDL_WaitEvent error: %s\n", SDL_GetError()); | |
| 178 exit(1); | |
| 179 }</PRE | |
| 180 ></P | |
| 181 ></DIV | |
| 182 ></DIV | |
| 183 ><DIV | |
| 184 CLASS="NAVFOOTER" | |
| 185 ><HR | |
| 186 ALIGN="LEFT" | |
| 187 WIDTH="100%"><TABLE | |
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355632dca928
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parents:
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diff
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188 SUMMARY="Footer navigation table" |
| 0 | 189 WIDTH="100%" |
| 190 BORDER="0" | |
| 191 CELLPADDING="0" | |
| 192 CELLSPACING="0" | |
| 193 ><TR | |
| 194 ><TD | |
| 195 WIDTH="33%" | |
| 196 ALIGN="left" | |
| 197 VALIGN="top" | |
| 198 ><A | |
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199 HREF="guideexamples.html" |
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355632dca928
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Sam Lantinga <slouken@libsdl.org>
parents:
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200 ACCESSKEY="P" |
| 0 | 201 >Prev</A |
| 202 ></TD | |
| 203 ><TD | |
| 204 WIDTH="34%" | |
| 205 ALIGN="center" | |
| 206 VALIGN="top" | |
| 207 ><A | |
| 208 HREF="index.html" | |
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209 ACCESSKEY="H" |
| 0 | 210 >Home</A |
| 211 ></TD | |
| 212 ><TD | |
| 213 WIDTH="33%" | |
| 214 ALIGN="right" | |
| 215 VALIGN="top" | |
| 216 ><A | |
| 217 HREF="guideaudioexamples.html" | |
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355632dca928
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parents:
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218 ACCESSKEY="N" |
| 0 | 219 >Next</A |
| 220 ></TD | |
| 221 ></TR | |
| 222 ><TR | |
| 223 ><TD | |
| 224 WIDTH="33%" | |
| 225 ALIGN="left" | |
| 226 VALIGN="top" | |
|
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227 >Examples</TD |
| 0 | 228 ><TD |
| 229 WIDTH="34%" | |
| 230 ALIGN="center" | |
| 231 VALIGN="top" | |
| 232 ><A | |
| 233 HREF="guideexamples.html" | |
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355632dca928
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parents:
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234 ACCESSKEY="U" |
| 0 | 235 >Up</A |
| 236 ></TD | |
| 237 ><TD | |
| 238 WIDTH="33%" | |
| 239 ALIGN="right" | |
| 240 VALIGN="top" | |
| 241 >Audio Examples</TD | |
| 242 ></TR | |
| 243 ></TABLE | |
| 244 ></DIV | |
| 245 ></BODY | |
| 246 ></HTML | |
| 247 > |