Mercurial > sdl-ios-xcode
annotate docs/html/sdlkeysym.html @ 353:d47637068e52
The documented error return value for SDL_WaitEvent() is 0.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 15 Apr 2002 04:53:41 +0000 |
| parents | e5bc29de3f0a |
| children | 355632dca928 |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_keysym</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="SDL Event Structures." | |
| 14 HREF="eventstructures.html"><LINK | |
| 15 REL="PREVIOUS" | |
| 16 TITLE="SDL_QuitEvent" | |
| 17 HREF="sdlquitevent.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDLKey" | |
| 20 HREF="sdlkey.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="sdlquitevent.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="sdlkey.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="SDLKEYSYM" | |
| 71 >SDL_keysym</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
|
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76 NAME="AEN4275" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_keysym -- Keysym structure</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSECT1" | |
| 83 ><A | |
|
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84 NAME="AEN4278" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Structure Definition</H2 | |
| 88 ><PRE | |
| 89 CLASS="PROGRAMLISTING" | |
| 90 >typedef struct{ | |
| 91 Uint8 scancode; | |
| 92 SDLKey sym; | |
| 93 SDLMod mod; | |
| 94 Uint16 unicode; | |
| 95 } SDL_keysym;</PRE | |
| 96 ></DIV | |
| 97 ><DIV | |
| 98 CLASS="REFSECT1" | |
| 99 ><A | |
|
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100 NAME="AEN4281" |
| 0 | 101 ></A |
| 102 ><H2 | |
| 103 >Structure Data</H2 | |
| 104 ><DIV | |
| 105 CLASS="INFORMALTABLE" | |
| 106 ><A | |
|
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107 NAME="AEN4283" |
| 0 | 108 ></A |
| 109 ><P | |
| 110 ></P | |
| 111 ><TABLE | |
| 112 BORDER="0" | |
| 113 CLASS="CALSTABLE" | |
| 114 ><TBODY | |
| 115 ><TR | |
| 116 ><TD | |
| 117 ALIGN="LEFT" | |
| 118 VALIGN="TOP" | |
| 119 ><TT | |
| 120 CLASS="STRUCTFIELD" | |
| 121 ><I | |
| 122 >scancode</I | |
| 123 ></TT | |
| 124 ></TD | |
| 125 ><TD | |
| 126 ALIGN="LEFT" | |
| 127 VALIGN="TOP" | |
| 128 >Hardware specific scancode</TD | |
| 129 ></TR | |
| 130 ><TR | |
| 131 ><TD | |
| 132 ALIGN="LEFT" | |
| 133 VALIGN="TOP" | |
| 134 ><TT | |
| 135 CLASS="STRUCTFIELD" | |
| 136 ><I | |
| 137 >sym</I | |
| 138 ></TT | |
| 139 ></TD | |
| 140 ><TD | |
| 141 ALIGN="LEFT" | |
| 142 VALIGN="TOP" | |
| 143 >SDL virtual keysym</TD | |
| 144 ></TR | |
| 145 ><TR | |
| 146 ><TD | |
| 147 ALIGN="LEFT" | |
| 148 VALIGN="TOP" | |
| 149 ><TT | |
| 150 CLASS="STRUCTFIELD" | |
| 151 ><I | |
| 152 >mod</I | |
| 153 ></TT | |
| 154 ></TD | |
| 155 ><TD | |
| 156 ALIGN="LEFT" | |
| 157 VALIGN="TOP" | |
| 158 >Current key modifiers</TD | |
| 159 ></TR | |
| 160 ><TR | |
| 161 ><TD | |
| 162 ALIGN="LEFT" | |
| 163 VALIGN="TOP" | |
| 164 ><TT | |
| 165 CLASS="STRUCTFIELD" | |
| 166 ><I | |
| 167 >unicode</I | |
| 168 ></TT | |
| 169 ></TD | |
| 170 ><TD | |
| 171 ALIGN="LEFT" | |
| 172 VALIGN="TOP" | |
| 173 >Translated character</TD | |
| 174 ></TR | |
| 175 ></TBODY | |
| 176 ></TABLE | |
| 177 ><P | |
| 178 ></P | |
| 179 ></DIV | |
| 180 ></DIV | |
| 181 ><DIV | |
| 182 CLASS="REFSECT1" | |
| 183 ><A | |
|
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184 NAME="AEN4302" |
| 0 | 185 ></A |
| 186 ><H2 | |
| 187 >Description</H2 | |
| 188 ><P | |
| 189 >The <SPAN | |
| 190 CLASS="STRUCTNAME" | |
| 191 >SDL_keysym</SPAN | |
| 192 > structure is used by reporting key presses and releases since it is a part of the <A | |
| 193 HREF="sdlkeyboardevent.html" | |
| 194 ><SPAN | |
| 195 CLASS="STRUCTNAME" | |
| 196 >SDL_KeyboardEvent</SPAN | |
| 197 ></A | |
| 198 >.</P | |
| 199 ><P | |
| 200 >The <TT | |
| 201 CLASS="STRUCTFIELD" | |
| 202 ><I | |
| 203 >scancode</I | |
| 204 ></TT | |
| 205 > field should generally be left alone, it is the hardware dependent scancode returned by the keyboard. The <TT | |
| 206 CLASS="STRUCTFIELD" | |
| 207 ><I | |
| 208 >sym</I | |
| 209 ></TT | |
| 210 > field is extremely useful. It is the SDL-defined value of the key (see <A | |
| 211 HREF="sdlkey.html" | |
| 212 >SDL Key Syms</A | |
| 213 >. This field is very useful when you are checking for certain key presses, like so: | |
| 214 <PRE | |
| 215 CLASS="PROGRAMLISTING" | |
| 216 >. | |
| 217 . | |
| 218 while(SDL_PollEvent(&event)){ | |
| 219 switch(event.type){ | |
| 220 case SDL_KEYDOWN: | |
| 221 if(event.key.keysym.sym==SDLK_LEFT) | |
| 222 move_left(); | |
| 223 break; | |
| 224 . | |
| 225 . | |
| 226 . | |
| 227 } | |
| 228 } | |
| 229 . | |
| 230 .</PRE | |
| 231 > | |
| 232 <TT | |
| 233 CLASS="STRUCTFIELD" | |
| 234 ><I | |
| 235 >mod</I | |
| 236 ></TT | |
| 237 > stores the current state of the keyboard modifiers as explained in <A | |
| 238 HREF="sdlgetmodstate.html" | |
| 239 ><TT | |
| 240 CLASS="FUNCTION" | |
| 241 >SDL_GetModState</TT | |
| 242 ></A | |
| 243 >. The <TT | |
| 244 CLASS="STRUCTFIELD" | |
| 245 ><I | |
| 246 >unicode</I | |
| 247 ></TT | |
| 248 > is only used when UNICODE translation is enabled with <A | |
| 249 HREF="sdlenableunicode.html" | |
| 250 ><TT | |
| 251 CLASS="FUNCTION" | |
| 252 >SDL_EnableUNICODE</TT | |
| 253 ></A | |
| 254 >. If <TT | |
| 255 CLASS="STRUCTFIELD" | |
| 256 ><I | |
| 257 >unicode</I | |
| 258 ></TT | |
| 259 > is non-zero then this a the UNICODE character corresponding to the keypress. If the high 9 bits of the character are 0, then this maps to the equivalent ASCII character: | |
| 260 <PRE | |
| 261 CLASS="PROGRAMLISTING" | |
| 262 >char ch; | |
| 263 if ( (keysym.unicode & 0xFF80) == 0 ) { | |
| 264 ch = keysym.unicode & 0x7F; | |
| 265 } | |
| 266 else { | |
| 267 printf("An International Character.\n"); | |
| 268 }</PRE | |
| 269 > | |
| 270 UNICODE translation does have a slight overhead so don't enable it unless its needed.</P | |
| 271 ></DIV | |
| 272 ><DIV | |
| 273 CLASS="REFSECT1" | |
| 274 ><A | |
|
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275 NAME="AEN4321" |
| 0 | 276 ></A |
| 277 ><H2 | |
| 278 >See Also</H2 | |
| 279 ><P | |
| 280 ><A | |
| 281 HREF="sdlkey.html" | |
| 282 ><SPAN | |
| 283 CLASS="STRUCTNAME" | |
| 284 >SDLKey</SPAN | |
| 285 ></A | |
| 286 ></P | |
| 287 ></DIV | |
| 288 ><DIV | |
| 289 CLASS="NAVFOOTER" | |
| 290 ><HR | |
| 291 ALIGN="LEFT" | |
| 292 WIDTH="100%"><TABLE | |
| 293 WIDTH="100%" | |
| 294 BORDER="0" | |
| 295 CELLPADDING="0" | |
| 296 CELLSPACING="0" | |
| 297 ><TR | |
| 298 ><TD | |
| 299 WIDTH="33%" | |
| 300 ALIGN="left" | |
| 301 VALIGN="top" | |
| 302 ><A | |
| 303 HREF="sdlquitevent.html" | |
| 304 >Prev</A | |
| 305 ></TD | |
| 306 ><TD | |
| 307 WIDTH="34%" | |
| 308 ALIGN="center" | |
| 309 VALIGN="top" | |
| 310 ><A | |
| 311 HREF="index.html" | |
| 312 >Home</A | |
| 313 ></TD | |
| 314 ><TD | |
| 315 WIDTH="33%" | |
| 316 ALIGN="right" | |
| 317 VALIGN="top" | |
| 318 ><A | |
| 319 HREF="sdlkey.html" | |
| 320 >Next</A | |
| 321 ></TD | |
| 322 ></TR | |
| 323 ><TR | |
| 324 ><TD | |
| 325 WIDTH="33%" | |
| 326 ALIGN="left" | |
| 327 VALIGN="top" | |
| 328 >SDL_QuitEvent</TD | |
| 329 ><TD | |
| 330 WIDTH="34%" | |
| 331 ALIGN="center" | |
| 332 VALIGN="top" | |
| 333 ><A | |
| 334 HREF="eventstructures.html" | |
| 335 >Up</A | |
| 336 ></TD | |
| 337 ><TD | |
| 338 WIDTH="33%" | |
| 339 ALIGN="right" | |
| 340 VALIGN="top" | |
| 341 >SDLKey</TD | |
| 342 ></TR | |
| 343 ></TABLE | |
| 344 ></DIV | |
| 345 ></BODY | |
| 346 ></HTML | |
| 347 > |