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Initial revision
author Sam Lantinga <slouken@lokigames.com>
date Thu, 26 Apr 2001 16:45:43 +0000
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children 55f1f1b3e27d
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1 <HTML
2 ><HEAD
3 ><TITLE
4 >Event Examples</TITLE
5 ><META
6 NAME="GENERATOR"
7 CONTENT="Modular DocBook HTML Stylesheet Version 1.61
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"
16 TITLE="Video Examples"
17 HREF="guidevideoexamples.html"><LINK
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
31 WIDTH="100%"
32 BORDER="0"
33 CELLPADDING="0"
34 CELLSPACING="0"
35 ><TR
36 ><TH
37 COLSPAN="3"
38 ALIGN="center"
39 >SDL Library Documentation</TH
40 ></TR
41 ><TR
42 ><TD
43 WIDTH="10%"
44 ALIGN="left"
45 VALIGN="bottom"
46 ><A
47 HREF="guidevideoexamples.html"
48 >Prev</A
49 ></TD
50 ><TD
51 WIDTH="80%"
52 ALIGN="center"
53 VALIGN="bottom"
54 >Chapter 4. Examples</TD
55 ><TD
56 WIDTH="10%"
57 ALIGN="right"
58 VALIGN="bottom"
59 ><A
60 HREF="guideaudioexamples.html"
61 >Next</A
62 ></TD
63 ></TR
64 ></TABLE
65 ><HR
66 ALIGN="LEFT"
67 WIDTH="100%"></DIV
68 ><DIV
69 CLASS="SECT1"
70 ><H1
71 CLASS="SECT1"
72 ><A
73 NAME="GUIDEEVENTEXAMPLES"
74 >Event Examples</A
75 ></H1
76 ><P
77 ></P
78 ><DIV
79 CLASS="SECT2"
80 ><H2
81 CLASS="SECT2"
82 ><A
83 NAME="AEN336"
84 >Filtering and Handling Events</A
85 ></H2
86 ><P
87 ><PRE
88 CLASS="PROGRAMLISTING"
89 >#include &#60;stdio.h&#62;
90 #include &#60;stdlib.h&#62;
91
92 #include "SDL.h"
93
94 /* This function may run in a separate event thread */
95 int FilterEvents(const SDL_Event *event) {
96 static int boycott = 1;
97
98 /* This quit event signals the closing of the window */
99 if ( (event-&#62;type == SDL_QUIT) &#38;&#38; boycott ) {
100 printf("Quit event filtered out -- try again.\n");
101 boycott = 0;
102 return(0);
103 }
104 if ( event-&#62;type == SDL_MOUSEMOTION ) {
105 printf("Mouse moved to (%d,%d)\n",
106 event-&#62;motion.x, event-&#62;motion.y);
107 return(0); /* Drop it, we've handled it */
108 }
109 return(1);
110 }
111
112 int main(int argc, char *argv[])
113 {
114 SDL_Event event;
115
116 /* Initialize the SDL library (starts the event loop) */
117 if ( SDL_Init(SDL_INIT_VIDEO) &#60; 0 ) {
118 fprintf(stderr,
119 "Couldn't initialize SDL: %s\n", SDL_GetError());
120 exit(1);
121 }
122
123 /* Clean up on exit, exit on window close and interrupt */
124 atexit(SDL_Quit);
125
126 /* Ignore key events */
127 SDL_EventState(SDL_KEYDOWN, SDL_IGNORE);
128 SDL_EventState(SDL_KEYUP, SDL_IGNORE);
129
130 /* Filter quit and mouse motion events */
131 SDL_SetEventFilter(FilterEvents);
132
133 /* The mouse isn't much use unless we have a display for reference */
134 if ( SDL_SetVideoMode(640, 480, 8, 0) == NULL ) {
135 fprintf(stderr, "Couldn't set 640x480x8 video mode: %s\n",
136 SDL_GetError());
137 exit(1);
138 }
139
140 /* Loop waiting for ESC+Mouse_Button */
141 while ( SDL_WaitEvent(&#38;event) &#62;= 0 ) {
142 switch (event.type) {
143 case SDL_ACTIVEEVENT: {
144 if ( event.active.state &#38; SDL_APPACTIVE ) {
145 if ( event.active.gain ) {
146 printf("App activated\n");
147 } else {
148 printf("App iconified\n");
149 }
150 }
151 }
152 break;
153
154 case SDL_MOUSEBUTTONDOWN: {
155 Uint8 *keys;
156
157 keys = SDL_GetKeyState(NULL);
158 if ( keys[SDLK_ESCAPE] == SDL_PRESSED ) {
159 printf("Bye bye...\n");
160 exit(0);
161 }
162 printf("Mouse button pressed\n");
163 }
164 break;
165
166 case SDL_QUIT: {
167 printf("Quit requested, quitting.\n");
168 exit(0);
169 }
170 break;
171 }
172 }
173 /* This should never happen */
174 printf("SDL_WaitEvent error: %s\n", SDL_GetError());
175 exit(1);
176 }</PRE
177 ></P
178 ></DIV
179 ></DIV
180 ><DIV
181 CLASS="NAVFOOTER"
182 ><HR
183 ALIGN="LEFT"
184 WIDTH="100%"><TABLE
185 WIDTH="100%"
186 BORDER="0"
187 CELLPADDING="0"
188 CELLSPACING="0"
189 ><TR
190 ><TD
191 WIDTH="33%"
192 ALIGN="left"
193 VALIGN="top"
194 ><A
195 HREF="guidevideoexamples.html"
196 >Prev</A
197 ></TD
198 ><TD
199 WIDTH="34%"
200 ALIGN="center"
201 VALIGN="top"
202 ><A
203 HREF="index.html"
204 >Home</A
205 ></TD
206 ><TD
207 WIDTH="33%"
208 ALIGN="right"
209 VALIGN="top"
210 ><A
211 HREF="guideaudioexamples.html"
212 >Next</A
213 ></TD
214 ></TR
215 ><TR
216 ><TD
217 WIDTH="33%"
218 ALIGN="left"
219 VALIGN="top"
220 >Video Examples</TD
221 ><TD
222 WIDTH="34%"
223 ALIGN="center"
224 VALIGN="top"
225 ><A
226 HREF="guideexamples.html"
227 >Up</A
228 ></TD
229 ><TD
230 WIDTH="33%"
231 ALIGN="right"
232 VALIGN="top"
233 >Audio Examples</TD
234 ></TR
235 ></TABLE
236 ></DIV
237 ></BODY
238 ></HTML
239 >