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annotate docs/html/sdlseteventfilter.html @ 309:2de77f7b7a28
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 11 Mar 2002 17:38:56 +0000 |
| parents | e5bc29de3f0a |
| children | 355632dca928 |
| rev | line source |
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| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_SetEventFilter</TITLE | |
| 5 ><META | |
| 6 NAME="GENERATOR" | |
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.64 |
| 0 | 8 "><LINK |
| 9 REL="HOME" | |
| 10 TITLE="SDL Library Documentation" | |
| 11 HREF="index.html"><LINK | |
| 12 REL="UP" | |
| 13 TITLE="Event Functions." | |
| 14 HREF="eventfunctions.html"><LINK | |
| 15 REL="PREVIOUS" | |
| 16 TITLE="SDL_PushEvent" | |
| 17 HREF="sdlpushevent.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_GetEventFilter" | |
| 20 HREF="sdlgeteventfilter.html"></HEAD | |
| 21 ><BODY | |
| 22 CLASS="REFENTRY" | |
| 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="sdlpushevent.html" | |
| 48 >Prev</A | |
| 49 ></TD | |
| 50 ><TD | |
| 51 WIDTH="80%" | |
| 52 ALIGN="center" | |
| 53 VALIGN="bottom" | |
| 54 ></TD | |
| 55 ><TD | |
| 56 WIDTH="10%" | |
| 57 ALIGN="right" | |
| 58 VALIGN="bottom" | |
| 59 ><A | |
| 60 HREF="sdlgeteventfilter.html" | |
| 61 >Next</A | |
| 62 ></TD | |
| 63 ></TR | |
| 64 ></TABLE | |
| 65 ><HR | |
| 66 ALIGN="LEFT" | |
| 67 WIDTH="100%"></DIV | |
| 68 ><H1 | |
| 69 ><A | |
| 70 NAME="SDLSETEVENTFILTER" | |
| 71 >SDL_SetEventFilter</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
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76 NAME="AEN5187" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_SetEventFilter -- Sets up a filter to process all events before they are posted | |
| 81 to the event queue.</DIV | |
| 82 ><DIV | |
| 83 CLASS="REFSYNOPSISDIV" | |
| 84 ><A | |
|
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85 NAME="AEN5190" |
| 0 | 86 ></A |
| 87 ><H2 | |
| 88 >Synopsis</H2 | |
| 89 ><DIV | |
| 90 CLASS="FUNCSYNOPSIS" | |
| 91 ><A | |
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92 NAME="AEN5191" |
| 0 | 93 ></A |
| 94 ><P | |
| 95 ></P | |
| 96 ><PRE | |
| 97 CLASS="FUNCSYNOPSISINFO" | |
| 98 >#include "SDL.h"</PRE | |
| 99 ><P | |
| 100 ><CODE | |
| 101 ><CODE | |
| 102 CLASS="FUNCDEF" | |
| 103 >void <B | |
| 104 CLASS="FSFUNC" | |
| 105 >SDL_SetEventFilter</B | |
| 106 ></CODE | |
| 107 >(SDL_EventFilter filter);</CODE | |
| 108 ></P | |
| 109 ><P | |
| 110 ></P | |
| 111 ></DIV | |
| 112 ></DIV | |
| 113 ><DIV | |
| 114 CLASS="REFSECT1" | |
| 115 ><A | |
|
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116 NAME="AEN5197" |
| 0 | 117 ></A |
| 118 ><H2 | |
| 119 >Description</H2 | |
| 120 ><P | |
| 121 >This function sets up a filter to process all events before they are posted | |
| 122 to the event queue. This is a very powerful and flexible feature. The filter | |
| 123 is prototyped as: | |
| 124 <PRE | |
| 125 CLASS="PROGRAMLISTING" | |
| 126 >typedef int (*SDL_EventFilter)(const SDL_Event *event);</PRE | |
| 127 > | |
| 128 If the filter returns <SPAN | |
| 129 CLASS="RETURNVALUE" | |
| 130 >1</SPAN | |
| 131 >, then the event will be | |
| 132 added to the internal queue. If it returns <SPAN | |
| 133 CLASS="RETURNVALUE" | |
| 134 >0</SPAN | |
| 135 >, | |
| 136 then the event will be dropped from the queue. This allows selective | |
| 137 filtering of dynamically.</P | |
| 138 ><P | |
| 139 >There is one caveat when dealing with the <TT | |
| 140 CLASS="LITERAL" | |
| 141 >SDL_QUITEVENT</TT | |
| 142 > event type. The | |
| 143 event filter is only called when the window manager desires to close the | |
| 144 application window. If the event filter returns 1, then the window will | |
| 145 be closed, otherwise the window will remain open if possible. | |
| 146 If the quit event is generated by an interrupt signal, it will bypass the | |
| 147 internal queue and be delivered to the application at the next event poll.</P | |
| 148 ><DIV | |
| 149 CLASS="NOTE" | |
| 150 ><BLOCKQUOTE | |
| 151 CLASS="NOTE" | |
| 152 ><P | |
| 153 ><B | |
| 154 >Note: </B | |
| 155 >Events pushed onto the queue with <A | |
| 156 HREF="sdlpushevent.html" | |
| 157 ><TT | |
| 158 CLASS="FUNCTION" | |
| 159 >SDL_PushEvent</TT | |
| 160 ></A | |
| 161 > or <A | |
| 162 HREF="sdlpeepevents.html" | |
| 163 ><TT | |
| 164 CLASS="FUNCTION" | |
| 165 >SDL_PeepEvents</TT | |
| 166 ></A | |
| 167 > do not get passed through the event filter.</P | |
| 168 ></BLOCKQUOTE | |
| 169 ></DIV | |
| 170 ><DIV | |
| 171 CLASS="NOTE" | |
| 172 ><BLOCKQUOTE | |
| 173 CLASS="NOTE" | |
| 174 ><P | |
| 175 ><B | |
| 176 >Note: </B | |
| 177 ><I | |
| 178 CLASS="EMPHASIS" | |
| 179 >Be Careful!</I | |
| 180 > The event filter function may run in a different thread so be careful what you do within it.</P | |
| 181 ></BLOCKQUOTE | |
| 182 ></DIV | |
| 183 ></DIV | |
| 184 ><DIV | |
| 185 CLASS="REFSECT1" | |
| 186 ><A | |
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187 NAME="AEN5214" |
| 0 | 188 ></A |
| 189 ><H2 | |
| 190 >See Also</H2 | |
| 191 ><P | |
| 192 ><A | |
| 193 HREF="sdlevent.html" | |
| 194 ><SPAN | |
| 195 CLASS="STRUCTNAME" | |
| 196 >SDL_Event</SPAN | |
| 197 ></A | |
| 198 >, | |
| 199 <A | |
| 200 HREF="sdlgeteventfilter.html" | |
| 201 ><TT | |
| 202 CLASS="FUNCTION" | |
| 203 >SDL_GetEventFilter</TT | |
| 204 ></A | |
| 205 >, | |
| 206 <A | |
| 207 HREF="sdlpushevent.html" | |
| 208 ><TT | |
| 209 CLASS="FUNCTION" | |
| 210 >SDL_PushEvent</TT | |
| 211 ></A | |
| 212 ></P | |
| 213 ></DIV | |
| 214 ><DIV | |
| 215 CLASS="NAVFOOTER" | |
| 216 ><HR | |
| 217 ALIGN="LEFT" | |
| 218 WIDTH="100%"><TABLE | |
| 219 WIDTH="100%" | |
| 220 BORDER="0" | |
| 221 CELLPADDING="0" | |
| 222 CELLSPACING="0" | |
| 223 ><TR | |
| 224 ><TD | |
| 225 WIDTH="33%" | |
| 226 ALIGN="left" | |
| 227 VALIGN="top" | |
| 228 ><A | |
| 229 HREF="sdlpushevent.html" | |
| 230 >Prev</A | |
| 231 ></TD | |
| 232 ><TD | |
| 233 WIDTH="34%" | |
| 234 ALIGN="center" | |
| 235 VALIGN="top" | |
| 236 ><A | |
| 237 HREF="index.html" | |
| 238 >Home</A | |
| 239 ></TD | |
| 240 ><TD | |
| 241 WIDTH="33%" | |
| 242 ALIGN="right" | |
| 243 VALIGN="top" | |
| 244 ><A | |
| 245 HREF="sdlgeteventfilter.html" | |
| 246 >Next</A | |
| 247 ></TD | |
| 248 ></TR | |
| 249 ><TR | |
| 250 ><TD | |
| 251 WIDTH="33%" | |
| 252 ALIGN="left" | |
| 253 VALIGN="top" | |
| 254 >SDL_PushEvent</TD | |
| 255 ><TD | |
| 256 WIDTH="34%" | |
| 257 ALIGN="center" | |
| 258 VALIGN="top" | |
| 259 ><A | |
| 260 HREF="eventfunctions.html" | |
| 261 >Up</A | |
| 262 ></TD | |
| 263 ><TD | |
| 264 WIDTH="33%" | |
| 265 ALIGN="right" | |
| 266 VALIGN="top" | |
| 267 >SDL_GetEventFilter</TD | |
| 268 ></TR | |
| 269 ></TABLE | |
| 270 ></DIV | |
| 271 ></BODY | |
| 272 ></HTML | |
| 273 > |