Mercurial > sdl-ios-xcode
annotate docs/html/sdlevent.html @ 3844:332a59e39ce1 SDL-ryan-multiple-audio-device
I really don't want to update these last two audio backends...I added an
error that says if no one complains, the backends will be removed eventually.
So if anyone ever wants them and they care enough to speak up, we'll know to
do something about it. If no one does, that's less code to maintain. :)
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Tue, 17 Oct 2006 06:45:17 +0000 |
| parents | 355632dca928 |
| children | 85cbe9c892f4 |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_Event</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="SDL Event Structures." | |
| 14 HREF="eventstructures.html"><LINK | |
| 15 REL="PREVIOUS" | |
| 16 TITLE="SDL Event Structures." | |
| 17 HREF="eventstructures.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_ActiveEvent" | |
| 20 HREF="sdlactiveevent.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 | |
|
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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 | |
| 48 HREF="eventstructures.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 ></TD | |
| 57 ><TD | |
| 58 WIDTH="10%" | |
| 59 ALIGN="right" | |
| 60 VALIGN="bottom" | |
| 61 ><A | |
| 62 HREF="sdlactiveevent.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 ><H1 | |
| 72 ><A | |
| 73 NAME="SDLEVENT" | |
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74 ></A |
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75 >SDL_Event</H1 |
| 0 | 76 ><DIV |
| 77 CLASS="REFNAMEDIV" | |
| 78 ><A | |
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79 NAME="AEN3711" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Name</H2 | |
| 83 >SDL_Event -- General event structure</DIV | |
| 84 ><DIV | |
| 85 CLASS="REFSECT1" | |
| 86 ><A | |
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87 NAME="AEN3714" |
| 0 | 88 ></A |
| 89 ><H2 | |
| 90 >Structure Definition</H2 | |
| 91 ><PRE | |
| 92 CLASS="PROGRAMLISTING" | |
| 93 >typedef union{ | |
| 94 Uint8 type; | |
| 95 SDL_ActiveEvent active; | |
| 96 SDL_KeyboardEvent key; | |
| 97 SDL_MouseMotionEvent motion; | |
| 98 SDL_MouseButtonEvent button; | |
| 99 SDL_JoyAxisEvent jaxis; | |
| 100 SDL_JoyBallEvent jball; | |
| 101 SDL_JoyHatEvent jhat; | |
| 102 SDL_JoyButtonEvent jbutton; | |
| 103 SDL_ResizeEvent resize; | |
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104 SDL_ExposeEvent expose; |
| 0 | 105 SDL_QuitEvent quit; |
| 106 SDL_UserEvent user; | |
| 107 SDL_SywWMEvent syswm; | |
| 108 } SDL_Event;</PRE | |
| 109 ></DIV | |
| 110 ><DIV | |
| 111 CLASS="REFSECT1" | |
| 112 ><A | |
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113 NAME="AEN3717" |
| 0 | 114 ></A |
| 115 ><H2 | |
| 116 >Structure Data</H2 | |
| 117 ><DIV | |
| 118 CLASS="INFORMALTABLE" | |
| 119 ><A | |
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120 NAME="AEN3719" |
| 0 | 121 ></A |
| 122 ><P | |
| 123 ></P | |
| 124 ><TABLE | |
| 125 BORDER="0" | |
| 126 CLASS="CALSTABLE" | |
| 127 ><TBODY | |
| 128 ><TR | |
| 129 ><TD | |
| 130 ALIGN="LEFT" | |
| 131 VALIGN="TOP" | |
| 132 ><TT | |
| 133 CLASS="STRUCTFIELD" | |
| 134 ><I | |
| 135 >type</I | |
| 136 ></TT | |
| 137 ></TD | |
| 138 ><TD | |
| 139 ALIGN="LEFT" | |
| 140 VALIGN="TOP" | |
| 141 >The type of event</TD | |
| 142 ></TR | |
| 143 ><TR | |
| 144 ><TD | |
| 145 ALIGN="LEFT" | |
| 146 VALIGN="TOP" | |
| 147 ><TT | |
| 148 CLASS="STRUCTFIELD" | |
| 149 ><I | |
| 150 >active</I | |
| 151 ></TT | |
| 152 ></TD | |
| 153 ><TD | |
| 154 ALIGN="LEFT" | |
| 155 VALIGN="TOP" | |
| 156 ><A | |
| 157 HREF="sdlactiveevent.html" | |
| 158 >Activation event</A | |
| 159 ></TD | |
| 160 ></TR | |
| 161 ><TR | |
| 162 ><TD | |
| 163 ALIGN="LEFT" | |
| 164 VALIGN="TOP" | |
| 165 ><TT | |
| 166 CLASS="STRUCTFIELD" | |
| 167 ><I | |
| 168 >key</I | |
| 169 ></TT | |
| 170 ></TD | |
| 171 ><TD | |
| 172 ALIGN="LEFT" | |
| 173 VALIGN="TOP" | |
| 174 ><A | |
| 175 HREF="sdlkeyboardevent.html" | |
| 176 >Keyboard event</A | |
| 177 ></TD | |
| 178 ></TR | |
| 179 ><TR | |
| 180 ><TD | |
| 181 ALIGN="LEFT" | |
| 182 VALIGN="TOP" | |
| 183 ><TT | |
| 184 CLASS="STRUCTFIELD" | |
| 185 ><I | |
| 186 >motion</I | |
| 187 ></TT | |
| 188 ></TD | |
| 189 ><TD | |
| 190 ALIGN="LEFT" | |
| 191 VALIGN="TOP" | |
| 192 ><A | |
| 193 HREF="sdlmousemotionevent.html" | |
| 194 >Mouse motion event</A | |
| 195 ></TD | |
| 196 ></TR | |
| 197 ><TR | |
| 198 ><TD | |
| 199 ALIGN="LEFT" | |
| 200 VALIGN="TOP" | |
| 201 ><TT | |
| 202 CLASS="STRUCTFIELD" | |
| 203 ><I | |
| 204 >button</I | |
| 205 ></TT | |
| 206 ></TD | |
| 207 ><TD | |
| 208 ALIGN="LEFT" | |
| 209 VALIGN="TOP" | |
| 210 ><A | |
| 211 HREF="sdlmousebuttonevent.html" | |
| 212 >Mouse button event</A | |
| 213 ></TD | |
| 214 ></TR | |
| 215 ><TR | |
| 216 ><TD | |
| 217 ALIGN="LEFT" | |
| 218 VALIGN="TOP" | |
| 219 ><TT | |
| 220 CLASS="STRUCTFIELD" | |
| 221 ><I | |
| 222 >jaxis</I | |
| 223 ></TT | |
| 224 ></TD | |
| 225 ><TD | |
| 226 ALIGN="LEFT" | |
| 227 VALIGN="TOP" | |
| 228 ><A | |
| 229 HREF="sdljoyaxisevent.html" | |
| 230 >Joystick axis motion event</A | |
| 231 ></TD | |
| 232 ></TR | |
| 233 ><TR | |
| 234 ><TD | |
| 235 ALIGN="LEFT" | |
| 236 VALIGN="TOP" | |
| 237 ><TT | |
| 238 CLASS="STRUCTFIELD" | |
| 239 ><I | |
| 240 >jball</I | |
| 241 ></TT | |
| 242 ></TD | |
| 243 ><TD | |
| 244 ALIGN="LEFT" | |
| 245 VALIGN="TOP" | |
| 246 ><A | |
| 247 HREF="sdljoyballevent.html" | |
| 248 >Joystick trackball motion event</A | |
| 249 ></TD | |
| 250 ></TR | |
| 251 ><TR | |
| 252 ><TD | |
| 253 ALIGN="LEFT" | |
| 254 VALIGN="TOP" | |
| 255 ><TT | |
| 256 CLASS="STRUCTFIELD" | |
| 257 ><I | |
| 258 >jhat</I | |
| 259 ></TT | |
| 260 ></TD | |
| 261 ><TD | |
| 262 ALIGN="LEFT" | |
| 263 VALIGN="TOP" | |
| 264 ><A | |
| 265 HREF="sdljoyhatevent.html" | |
| 266 >Joystick hat motion event</A | |
| 267 ></TD | |
| 268 ></TR | |
| 269 ><TR | |
| 270 ><TD | |
| 271 ALIGN="LEFT" | |
| 272 VALIGN="TOP" | |
| 273 ><TT | |
| 274 CLASS="STRUCTFIELD" | |
| 275 ><I | |
| 276 >jbutton</I | |
| 277 ></TT | |
| 278 ></TD | |
| 279 ><TD | |
| 280 ALIGN="LEFT" | |
| 281 VALIGN="TOP" | |
| 282 ><A | |
| 283 HREF="sdljoybuttonevent.html" | |
| 284 >Joystick button event</A | |
| 285 ></TD | |
| 286 ></TR | |
| 287 ><TR | |
| 288 ><TD | |
| 289 ALIGN="LEFT" | |
| 290 VALIGN="TOP" | |
| 291 ><TT | |
| 292 CLASS="STRUCTFIELD" | |
| 293 ><I | |
| 294 >resize</I | |
| 295 ></TT | |
| 296 ></TD | |
| 297 ><TD | |
| 298 ALIGN="LEFT" | |
| 299 VALIGN="TOP" | |
| 300 ><A | |
| 301 HREF="sdlresizeevent.html" | |
| 302 >Application window resize event</A | |
| 303 ></TD | |
| 304 ></TR | |
| 305 ><TR | |
| 306 ><TD | |
| 307 ALIGN="LEFT" | |
| 308 VALIGN="TOP" | |
| 309 ><TT | |
| 310 CLASS="STRUCTFIELD" | |
| 311 ><I | |
|
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312 >expose</I |
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313 ></TT |
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314 ></TD |
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315 ><TD |
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316 ALIGN="LEFT" |
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317 VALIGN="TOP" |
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318 ><A |
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319 HREF="sdlexposeevent.html" |
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320 >Application window expose event</A |
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321 ></TD |
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322 ></TR |
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323 ><TR |
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324 ><TD |
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325 ALIGN="LEFT" |
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326 VALIGN="TOP" |
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327 ><TT |
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328 CLASS="STRUCTFIELD" |
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329 ><I |
| 0 | 330 >quit</I |
| 331 ></TT | |
| 332 ></TD | |
| 333 ><TD | |
| 334 ALIGN="LEFT" | |
| 335 VALIGN="TOP" | |
| 336 ><A | |
| 337 HREF="sdlquitevent.html" | |
| 338 >Application quit request event</A | |
| 339 ></TD | |
| 340 ></TR | |
| 341 ><TR | |
| 342 ><TD | |
| 343 ALIGN="LEFT" | |
| 344 VALIGN="TOP" | |
| 345 ><TT | |
| 346 CLASS="STRUCTFIELD" | |
| 347 ><I | |
| 348 >user</I | |
| 349 ></TT | |
| 350 ></TD | |
| 351 ><TD | |
| 352 ALIGN="LEFT" | |
| 353 VALIGN="TOP" | |
| 354 ><A | |
| 355 HREF="sdluserevent.html" | |
| 356 >User defined event</A | |
| 357 ></TD | |
| 358 ></TR | |
| 359 ><TR | |
| 360 ><TD | |
| 361 ALIGN="LEFT" | |
| 362 VALIGN="TOP" | |
| 363 ><TT | |
| 364 CLASS="STRUCTFIELD" | |
| 365 ><I | |
| 366 >syswm</I | |
| 367 ></TT | |
| 368 ></TD | |
| 369 ><TD | |
| 370 ALIGN="LEFT" | |
| 371 VALIGN="TOP" | |
| 372 ><A | |
| 373 HREF="sdlsyswmevent.html" | |
| 374 >Undefined window manager event</A | |
| 375 ></TD | |
| 376 ></TR | |
| 377 ></TBODY | |
| 378 ></TABLE | |
| 379 ><P | |
| 380 ></P | |
| 381 ></DIV | |
| 382 ></DIV | |
| 383 ><DIV | |
| 384 CLASS="REFSECT1" | |
| 385 ><A | |
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386 NAME="AEN3791" |
| 0 | 387 ></A |
| 388 ><H2 | |
| 389 >Description</H2 | |
| 390 ><P | |
| 391 >The <SPAN | |
| 392 CLASS="STRUCTNAME" | |
| 393 >SDL_Event</SPAN | |
| 394 > union is the core to all event handling is SDL, its probably the most important structure after <SPAN | |
| 395 CLASS="STRUCTNAME" | |
| 396 >SDL_Surface</SPAN | |
| 397 >. <SPAN | |
| 398 CLASS="STRUCTNAME" | |
| 399 >SDL_Event</SPAN | |
| 400 > is a union of all event structures used in SDL, using it is a simple matter of knowing which union member relates to which event <TT | |
| 401 CLASS="STRUCTFIELD" | |
| 402 ><I | |
| 403 >type</I | |
| 404 ></TT | |
| 405 >.</P | |
| 406 ><P | |
| 407 ><DIV | |
| 408 CLASS="INFORMALTABLE" | |
| 409 ><A | |
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410 NAME="AEN3799" |
| 0 | 411 ></A |
| 412 ><P | |
| 413 ></P | |
| 414 ><TABLE | |
| 415 BORDER="1" | |
| 416 CLASS="CALSTABLE" | |
| 417 ><THEAD | |
| 418 ><TR | |
| 419 ><TH | |
| 420 ALIGN="LEFT" | |
| 421 VALIGN="TOP" | |
| 422 >Event <TT | |
| 423 CLASS="STRUCTFIELD" | |
| 424 ><I | |
| 425 >type</I | |
| 426 ></TT | |
| 427 ></TH | |
| 428 ><TH | |
| 429 ALIGN="LEFT" | |
| 430 VALIGN="TOP" | |
| 431 >Event Structure</TH | |
| 432 ></TR | |
| 433 ></THEAD | |
| 434 ><TBODY | |
| 435 ><TR | |
| 436 ><TD | |
| 437 ALIGN="LEFT" | |
| 438 VALIGN="MIDDLE" | |
| 439 ><TT | |
| 440 CLASS="LITERAL" | |
| 441 >SDL_ACTIVEEVENT</TT | |
| 442 ></TD | |
| 443 ><TD | |
| 444 ALIGN="LEFT" | |
| 445 VALIGN="MIDDLE" | |
| 446 ><A | |
| 447 HREF="sdlactiveevent.html" | |
| 448 ><SPAN | |
| 449 CLASS="STRUCTNAME" | |
| 450 >SDL_ActiveEvent</SPAN | |
| 451 ></A | |
| 452 ></TD | |
| 453 ></TR | |
| 454 ><TR | |
| 455 ><TD | |
| 456 ALIGN="LEFT" | |
| 457 VALIGN="TOP" | |
| 458 ><TT | |
| 459 CLASS="LITERAL" | |
| 460 >SDL_KEYDOWN/UP</TT | |
| 461 ></TD | |
| 462 ><TD | |
| 463 ALIGN="LEFT" | |
| 464 VALIGN="TOP" | |
| 465 ><A | |
| 466 HREF="sdlkeyboardevent.html" | |
| 467 ><SPAN | |
| 468 CLASS="STRUCTNAME" | |
| 469 >SDL_KeyboardEvent</SPAN | |
| 470 ></A | |
| 471 ></TD | |
| 472 ></TR | |
| 473 ><TR | |
| 474 ><TD | |
| 475 ALIGN="LEFT" | |
| 476 VALIGN="TOP" | |
| 477 ><TT | |
| 478 CLASS="LITERAL" | |
| 479 >SDL_MOUSEMOTION</TT | |
| 480 ></TD | |
| 481 ><TD | |
| 482 ALIGN="LEFT" | |
| 483 VALIGN="TOP" | |
| 484 ><A | |
| 485 HREF="sdlmousemotionevent.html" | |
| 486 ><SPAN | |
| 487 CLASS="STRUCTNAME" | |
| 488 >SDL_MouseMotionEvent</SPAN | |
| 489 ></A | |
| 490 ></TD | |
| 491 ></TR | |
| 492 ><TR | |
| 493 ><TD | |
| 494 ALIGN="LEFT" | |
| 495 VALIGN="TOP" | |
| 496 ><TT | |
| 497 CLASS="LITERAL" | |
| 498 >SDL_MOUSEBUTTONDOWN/UP</TT | |
| 499 ></TD | |
| 500 ><TD | |
| 501 ALIGN="LEFT" | |
| 502 VALIGN="TOP" | |
| 503 ><A | |
| 504 HREF="sdlmousebuttonevent.html" | |
| 505 ><SPAN | |
| 506 CLASS="STRUCTNAME" | |
| 507 >SDL_MouseButtonEvent</SPAN | |
| 508 ></A | |
| 509 ></TD | |
| 510 ></TR | |
| 511 ><TR | |
| 512 ><TD | |
| 513 ALIGN="LEFT" | |
| 514 VALIGN="TOP" | |
| 515 ><TT | |
| 516 CLASS="LITERAL" | |
| 517 >SDL_JOYAXISMOTION</TT | |
| 518 ></TD | |
| 519 ><TD | |
| 520 ALIGN="LEFT" | |
| 521 VALIGN="TOP" | |
| 522 ><A | |
| 523 HREF="sdljoyaxisevent.html" | |
| 524 ><SPAN | |
| 525 CLASS="STRUCTNAME" | |
| 526 >SDL_JoyAxisEvent</SPAN | |
| 527 ></A | |
| 528 ></TD | |
| 529 ></TR | |
| 530 ><TR | |
| 531 ><TD | |
| 532 ALIGN="LEFT" | |
| 533 VALIGN="TOP" | |
| 534 ><TT | |
| 535 CLASS="LITERAL" | |
| 536 >SDL_JOYBALLMOTION</TT | |
| 537 ></TD | |
| 538 ><TD | |
| 539 ALIGN="LEFT" | |
| 540 VALIGN="TOP" | |
| 541 ><A | |
| 542 HREF="sdljoyballevent.html" | |
| 543 ><SPAN | |
| 544 CLASS="STRUCTNAME" | |
| 545 >SDL_JoyBallEvent</SPAN | |
| 546 ></A | |
| 547 ></TD | |
| 548 ></TR | |
| 549 ><TR | |
| 550 ><TD | |
| 551 ALIGN="LEFT" | |
| 552 VALIGN="TOP" | |
| 553 ><TT | |
| 554 CLASS="LITERAL" | |
| 555 >SDL_JOYHATMOTION</TT | |
| 556 ></TD | |
| 557 ><TD | |
| 558 ALIGN="LEFT" | |
| 559 VALIGN="TOP" | |
| 560 ><A | |
| 561 HREF="sdljoyhatevent.html" | |
| 562 ><SPAN | |
| 563 CLASS="STRUCTNAME" | |
| 564 >SDL_JoyHatEvent</SPAN | |
| 565 ></A | |
| 566 ></TD | |
| 567 ></TR | |
| 568 ><TR | |
| 569 ><TD | |
| 570 ALIGN="LEFT" | |
| 571 VALIGN="TOP" | |
| 572 ><TT | |
| 573 CLASS="LITERAL" | |
| 574 >SDL_JOYBUTTONDOWN/UP</TT | |
| 575 ></TD | |
| 576 ><TD | |
| 577 ALIGN="LEFT" | |
| 578 VALIGN="TOP" | |
| 579 ><A | |
| 580 HREF="sdljoybuttonevent.html" | |
| 581 ><SPAN | |
| 582 CLASS="STRUCTNAME" | |
| 583 >SDL_JoyButtonEvent</SPAN | |
| 584 ></A | |
| 585 ></TD | |
| 586 ></TR | |
| 587 ><TR | |
| 588 ><TD | |
| 589 ALIGN="LEFT" | |
| 590 VALIGN="TOP" | |
| 591 ><TT | |
| 592 CLASS="LITERAL" | |
| 593 >SDL_QUIT</TT | |
| 594 ></TD | |
| 595 ><TD | |
| 596 ALIGN="LEFT" | |
| 597 VALIGN="TOP" | |
| 598 ><A | |
| 599 HREF="sdlquitevent.html" | |
| 600 ><SPAN | |
| 601 CLASS="STRUCTNAME" | |
| 602 >SDL_QuitEvent</SPAN | |
| 603 ></A | |
| 604 ></TD | |
| 605 ></TR | |
| 606 ><TR | |
| 607 ><TD | |
| 608 ALIGN="LEFT" | |
| 609 VALIGN="TOP" | |
| 610 ><TT | |
| 611 CLASS="LITERAL" | |
| 612 >SDL_SYSWMEVENT</TT | |
| 613 ></TD | |
| 614 ><TD | |
| 615 ALIGN="LEFT" | |
| 616 VALIGN="TOP" | |
| 617 ><A | |
| 618 HREF="sdlsyswmevent.html" | |
| 619 ><SPAN | |
| 620 CLASS="STRUCTNAME" | |
| 621 >SDL_SysWMEvent</SPAN | |
| 622 ></A | |
| 623 ></TD | |
| 624 ></TR | |
| 625 ><TR | |
| 626 ><TD | |
| 627 ALIGN="LEFT" | |
| 628 VALIGN="TOP" | |
| 629 ><TT | |
| 630 CLASS="LITERAL" | |
| 631 >SDL_VIDEORESIZE</TT | |
| 632 ></TD | |
| 633 ><TD | |
| 634 ALIGN="LEFT" | |
| 635 VALIGN="TOP" | |
| 636 ><A | |
| 637 HREF="sdlresizeevent.html" | |
| 638 ><SPAN | |
| 639 CLASS="STRUCTNAME" | |
| 640 >SDL_ResizeEvent</SPAN | |
| 641 ></A | |
| 642 ></TD | |
| 643 ></TR | |
| 644 ><TR | |
| 645 ><TD | |
| 646 ALIGN="LEFT" | |
| 647 VALIGN="TOP" | |
| 648 ><TT | |
| 649 CLASS="LITERAL" | |
|
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650 >SDL_VIDEOEXPOSE</TT |
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651 ></TD |
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652 ><TD |
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653 ALIGN="LEFT" |
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654 VALIGN="TOP" |
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655 ><A |
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656 HREF="sdlexposeevent.html" |
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657 ><SPAN |
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658 CLASS="STRUCTNAME" |
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659 >SDL_ExposeEvent</SPAN |
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660 ></A |
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661 ></TD |
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662 ></TR |
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663 ><TR |
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664 ><TD |
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665 ALIGN="LEFT" |
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666 VALIGN="TOP" |
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667 ><TT |
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668 CLASS="LITERAL" |
| 0 | 669 >SDL_USEREVENT</TT |
| 670 ></TD | |
| 671 ><TD | |
| 672 ALIGN="LEFT" | |
| 673 VALIGN="TOP" | |
| 674 ><A | |
| 675 HREF="sdluserevent.html" | |
| 676 ><SPAN | |
| 677 CLASS="STRUCTNAME" | |
| 678 >SDL_UserEvent</SPAN | |
| 679 ></A | |
| 680 ></TD | |
| 681 ></TR | |
| 682 ></TBODY | |
| 683 ></TABLE | |
| 684 ><P | |
| 685 ></P | |
| 686 ></DIV | |
| 687 ></P | |
| 688 ></DIV | |
| 689 ><DIV | |
| 690 CLASS="REFSECT1" | |
| 691 ><A | |
|
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692 NAME="AEN3885" |
| 0 | 693 ></A |
| 694 ><H2 | |
| 695 >Use</H2 | |
| 696 ><P | |
| 697 >The <SPAN | |
| 698 CLASS="STRUCTNAME" | |
| 699 >SDL_Event</SPAN | |
| 700 > structure has two uses</P | |
| 701 ><P | |
| 702 ></P | |
| 703 ><UL | |
| 704 COMPACT="COMPACT" | |
| 705 ><LI | |
| 706 ><P | |
| 707 >Reading events on the event queue</P | |
| 708 ></LI | |
| 709 ><LI | |
| 710 ><P | |
| 711 >Placing events on the event queue</P | |
| 712 ></LI | |
| 713 ></UL | |
| 714 ><P | |
| 715 >Reading events from the event queue is done with either <A | |
| 716 HREF="sdlpollevent.html" | |
| 717 ><TT | |
| 718 CLASS="FUNCTION" | |
| 719 >SDL_PollEvent</TT | |
| 720 ></A | |
| 721 > or <A | |
| 722 HREF="sdlpeepevents.html" | |
| 723 ><TT | |
| 724 CLASS="FUNCTION" | |
| 725 >SDL_PeepEvents</TT | |
| 726 ></A | |
| 727 >. We'll use <TT | |
| 728 CLASS="FUNCTION" | |
| 729 >SDL_PollEvent</TT | |
| 730 > and step through an example.</P | |
| 731 ><P | |
| 732 >First off, we create an empty <SPAN | |
| 733 CLASS="STRUCTNAME" | |
| 734 >SDL_Event</SPAN | |
| 735 > structure. | |
| 736 <PRE | |
| 737 CLASS="PROGRAMLISTING" | |
| 738 >SDL_Event test_event;</PRE | |
| 739 > | |
| 740 <TT | |
| 741 CLASS="FUNCTION" | |
| 742 >SDL_PollEvent</TT | |
| 743 > removes the next event from the event queue, if there are no events on the queue it returns <SPAN | |
| 744 CLASS="RETURNVALUE" | |
| 745 >0</SPAN | |
| 746 > otherwise it returns <SPAN | |
| 747 CLASS="RETURNVALUE" | |
| 748 >1</SPAN | |
| 749 >. We use a <TT | |
| 750 CLASS="FUNCTION" | |
| 751 >while</TT | |
| 752 > loop to process each event in turn. | |
| 753 <PRE | |
| 754 CLASS="PROGRAMLISTING" | |
| 755 >while(SDL_PollEvent(&test_event)) {</PRE | |
| 756 > | |
| 757 The <TT | |
| 758 CLASS="FUNCTION" | |
| 759 >SDL_PollEvent</TT | |
| 760 > function take a pointer to an <SPAN | |
| 761 CLASS="STRUCTNAME" | |
| 762 >SDL_Event</SPAN | |
| 763 > structure that is to be filled with event information. We know that if <TT | |
| 764 CLASS="FUNCTION" | |
| 765 >SDL_PollEvent</TT | |
| 766 > removes an event from the queue then the event information will be placed in our <SPAN | |
| 767 CLASS="STRUCTNAME" | |
| 768 >test_event</SPAN | |
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769 > structure, but we also know that the <SPAN |
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770 CLASS="emphasis" |
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771 ><I |
| 0 | 772 CLASS="EMPHASIS" |
| 773 >type</I | |
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774 ></SPAN |
| 0 | 775 > of event will be placed in the <TT |
| 776 CLASS="STRUCTFIELD" | |
| 777 ><I | |
| 778 >type</I | |
| 779 ></TT | |
| 780 > member of <SPAN | |
| 781 CLASS="STRUCTNAME" | |
| 782 >test_event</SPAN | |
| 783 >. So to handle each event <TT | |
| 784 CLASS="STRUCTFIELD" | |
| 785 ><I | |
| 786 >type</I | |
| 787 ></TT | |
| 788 > seperately we use a <TT | |
| 789 CLASS="FUNCTION" | |
| 790 >switch</TT | |
| 791 > statement. | |
| 792 <PRE | |
| 793 CLASS="PROGRAMLISTING" | |
| 794 > switch(test_event.type) {</PRE | |
| 795 > | |
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796 We need to know what kind of events we're looking for <SPAN |
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797 CLASS="emphasis" |
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798 ><I |
| 0 | 799 CLASS="EMPHASIS" |
| 800 >and</I | |
|
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801 ></SPAN |
| 0 | 802 > the event <TT |
| 803 CLASS="STRUCTFIELD" | |
| 804 ><I | |
| 805 >type</I | |
| 806 ></TT | |
| 807 >'s of those events. So lets assume we want to detect where the user is moving the mouse pointer within our application. We look through our event types and notice that <TT | |
| 808 CLASS="LITERAL" | |
| 809 >SDL_MOUSEMOTION</TT | |
| 810 > is, more than likely, the event we're looking for. A little <A | |
| 811 HREF="sdlmousemotionevent.html" | |
| 812 >more</A | |
| 813 > research tells use that <TT | |
| 814 CLASS="LITERAL" | |
| 815 >SDL_MOUSEMOTION</TT | |
| 816 > events are handled within the <A | |
| 817 HREF="sdlmousemotionevent.html" | |
| 818 ><SPAN | |
| 819 CLASS="STRUCTNAME" | |
| 820 >SDL_MouseMotionEvent</SPAN | |
| 821 ></A | |
| 822 > structure which is the <TT | |
| 823 CLASS="STRUCTFIELD" | |
| 824 ><I | |
| 825 >motion</I | |
| 826 ></TT | |
| 827 > member of <SPAN | |
| 828 CLASS="STRUCTNAME" | |
| 829 >SDL_Event</SPAN | |
| 830 >. We can check for the <TT | |
| 831 CLASS="LITERAL" | |
| 832 >SDL_MOUSEMOTION</TT | |
| 833 > event <TT | |
| 834 CLASS="STRUCTFIELD" | |
| 835 ><I | |
| 836 >type</I | |
| 837 ></TT | |
| 838 > within our <TT | |
| 839 CLASS="FUNCTION" | |
| 840 >switch</TT | |
| 841 > statement like so: | |
| 842 <PRE | |
| 843 CLASS="PROGRAMLISTING" | |
| 844 > case SDL_MOUSEMOTION:</PRE | |
| 845 > | |
| 846 All we need do now is read the information out of the <TT | |
| 847 CLASS="STRUCTFIELD" | |
| 848 ><I | |
| 849 >motion</I | |
| 850 ></TT | |
| 851 > member of <SPAN | |
| 852 CLASS="STRUCTNAME" | |
| 853 >test_event</SPAN | |
| 854 >. | |
| 855 <PRE | |
| 856 CLASS="PROGRAMLISTING" | |
| 857 > printf("We got a motion event.\n"); | |
| 858 printf("Current mouse position is: (%d, %d)\n", test_event.motion.x, test_event.motion.y); | |
| 859 break; | |
| 860 default: | |
| 861 printf("Unhandled Event!\n"); | |
| 862 break; | |
| 863 } | |
| 864 } | |
| 865 printf("Event queue empty.\n");</PRE | |
| 866 ></P | |
| 867 ><P | |
| 868 >It is also possible to push events onto the event queue and so use it as a two-way communication path. Both <A | |
| 869 HREF="sdlpushevent.html" | |
| 870 ><TT | |
| 871 CLASS="FUNCTION" | |
| 872 >SDL_PushEvent</TT | |
| 873 ></A | |
| 874 > and <A | |
| 875 HREF="sdlpeepevents.html" | |
| 876 ><TT | |
| 877 CLASS="FUNCTION" | |
| 878 >SDL_PeepEvents</TT | |
| 879 ></A | |
| 880 > allow you to place events onto the event queue. This is usually used to place a <TT | |
| 881 CLASS="LITERAL" | |
| 882 >SDL_USEREVENT</TT | |
| 883 > on the event queue, however you could use it to post fake input events if you wished. Creating your own events is a simple matter of choosing the event type you want, setting the <TT | |
| 884 CLASS="STRUCTFIELD" | |
| 885 ><I | |
| 886 >type</I | |
| 887 ></TT | |
| 888 > member and filling the appropriate member structure with information. | |
| 889 <PRE | |
| 890 CLASS="PROGRAMLISTING" | |
| 891 >SDL_Event user_event; | |
| 892 | |
| 893 user_event.type=SDL_USEREVENT; | |
| 894 user_event.user.code=2; | |
| 895 user_event.user.data1=NULL; | |
| 896 user_event.user.data2=NULL; | |
| 897 SDL_PushEvent(&user_event);</PRE | |
| 898 ></P | |
| 899 ></DIV | |
| 900 ><DIV | |
| 901 CLASS="REFSECT1" | |
| 902 ><A | |
|
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903 NAME="AEN3942" |
| 0 | 904 ></A |
| 905 ><H2 | |
| 906 >See Also</H2 | |
| 907 ><P | |
| 908 ><A | |
| 909 HREF="sdlpollevent.html" | |
| 910 ><TT | |
| 911 CLASS="FUNCTION" | |
| 912 >SDL_PollEvent</TT | |
| 913 ></A | |
| 914 >, | |
| 915 <A | |
| 916 HREF="sdlpushevent.html" | |
| 917 ><TT | |
| 918 CLASS="FUNCTION" | |
| 919 >SDL_PushEvent</TT | |
| 920 ></A | |
| 921 >, | |
| 922 <A | |
| 923 HREF="sdlpeepevents.html" | |
| 924 ><TT | |
| 925 CLASS="FUNCTION" | |
| 926 >SDL_PeepEvents</TT | |
| 927 ></A | |
| 928 ></P | |
| 929 ></DIV | |
| 930 ><DIV | |
| 931 CLASS="NAVFOOTER" | |
| 932 ><HR | |
| 933 ALIGN="LEFT" | |
| 934 WIDTH="100%"><TABLE | |
|
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935 SUMMARY="Footer navigation table" |
| 0 | 936 WIDTH="100%" |
| 937 BORDER="0" | |
| 938 CELLPADDING="0" | |
| 939 CELLSPACING="0" | |
| 940 ><TR | |
| 941 ><TD | |
| 942 WIDTH="33%" | |
| 943 ALIGN="left" | |
| 944 VALIGN="top" | |
| 945 ><A | |
| 946 HREF="eventstructures.html" | |
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947 ACCESSKEY="P" |
| 0 | 948 >Prev</A |
| 949 ></TD | |
| 950 ><TD | |
| 951 WIDTH="34%" | |
| 952 ALIGN="center" | |
| 953 VALIGN="top" | |
| 954 ><A | |
| 955 HREF="index.html" | |
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956 ACCESSKEY="H" |
| 0 | 957 >Home</A |
| 958 ></TD | |
| 959 ><TD | |
| 960 WIDTH="33%" | |
| 961 ALIGN="right" | |
| 962 VALIGN="top" | |
| 963 ><A | |
| 964 HREF="sdlactiveevent.html" | |
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965 ACCESSKEY="N" |
| 0 | 966 >Next</A |
| 967 ></TD | |
| 968 ></TR | |
| 969 ><TR | |
| 970 ><TD | |
| 971 WIDTH="33%" | |
| 972 ALIGN="left" | |
| 973 VALIGN="top" | |
| 974 >SDL Event Structures.</TD | |
| 975 ><TD | |
| 976 WIDTH="34%" | |
| 977 ALIGN="center" | |
| 978 VALIGN="top" | |
| 979 ><A | |
| 980 HREF="eventstructures.html" | |
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981 ACCESSKEY="U" |
| 0 | 982 >Up</A |
| 983 ></TD | |
| 984 ><TD | |
| 985 WIDTH="33%" | |
| 986 ALIGN="right" | |
| 987 VALIGN="top" | |
| 988 >SDL_ActiveEvent</TD | |
| 989 ></TR | |
| 990 ></TABLE | |
| 991 ></DIV | |
| 992 ></BODY | |
| 993 ></HTML | |
| 994 > |