Mercurial > sdl-ios-xcode
annotate docs/html/sdlevent.html @ 340:b9f1ce709960
Fixed a minor memory leak in the SDL thread subsystem
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 11 Apr 2002 21:08:44 +0000 |
| parents | e5bc29de3f0a |
| children | 355632dca928 |
| 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 1.64 |
| 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 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 | |
| 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="eventstructures.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="sdlactiveevent.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="SDLEVENT" | |
| 71 >SDL_Event</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
|
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76 NAME="AEN3327" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_Event -- General event structure</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSECT1" | |
| 83 ><A | |
|
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84 NAME="AEN3330" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Structure Definition</H2 | |
| 88 ><PRE | |
| 89 CLASS="PROGRAMLISTING" | |
| 90 >typedef union{ | |
| 91 Uint8 type; | |
| 92 SDL_ActiveEvent active; | |
| 93 SDL_KeyboardEvent key; | |
| 94 SDL_MouseMotionEvent motion; | |
| 95 SDL_MouseButtonEvent button; | |
| 96 SDL_JoyAxisEvent jaxis; | |
| 97 SDL_JoyBallEvent jball; | |
| 98 SDL_JoyHatEvent jhat; | |
| 99 SDL_JoyButtonEvent jbutton; | |
| 100 SDL_ResizeEvent resize; | |
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101 SDL_ExposeEvent expose; |
| 0 | 102 SDL_QuitEvent quit; |
| 103 SDL_UserEvent user; | |
| 104 SDL_SywWMEvent syswm; | |
| 105 } SDL_Event;</PRE | |
| 106 ></DIV | |
| 107 ><DIV | |
| 108 CLASS="REFSECT1" | |
| 109 ><A | |
|
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110 NAME="AEN3333" |
| 0 | 111 ></A |
| 112 ><H2 | |
| 113 >Structure Data</H2 | |
| 114 ><DIV | |
| 115 CLASS="INFORMALTABLE" | |
| 116 ><A | |
|
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117 NAME="AEN3335" |
| 0 | 118 ></A |
| 119 ><P | |
| 120 ></P | |
| 121 ><TABLE | |
| 122 BORDER="0" | |
| 123 CLASS="CALSTABLE" | |
| 124 ><TBODY | |
| 125 ><TR | |
| 126 ><TD | |
| 127 ALIGN="LEFT" | |
| 128 VALIGN="TOP" | |
| 129 ><TT | |
| 130 CLASS="STRUCTFIELD" | |
| 131 ><I | |
| 132 >type</I | |
| 133 ></TT | |
| 134 ></TD | |
| 135 ><TD | |
| 136 ALIGN="LEFT" | |
| 137 VALIGN="TOP" | |
| 138 >The type of event</TD | |
| 139 ></TR | |
| 140 ><TR | |
| 141 ><TD | |
| 142 ALIGN="LEFT" | |
| 143 VALIGN="TOP" | |
| 144 ><TT | |
| 145 CLASS="STRUCTFIELD" | |
| 146 ><I | |
| 147 >active</I | |
| 148 ></TT | |
| 149 ></TD | |
| 150 ><TD | |
| 151 ALIGN="LEFT" | |
| 152 VALIGN="TOP" | |
| 153 ><A | |
| 154 HREF="sdlactiveevent.html" | |
| 155 >Activation event</A | |
| 156 ></TD | |
| 157 ></TR | |
| 158 ><TR | |
| 159 ><TD | |
| 160 ALIGN="LEFT" | |
| 161 VALIGN="TOP" | |
| 162 ><TT | |
| 163 CLASS="STRUCTFIELD" | |
| 164 ><I | |
| 165 >key</I | |
| 166 ></TT | |
| 167 ></TD | |
| 168 ><TD | |
| 169 ALIGN="LEFT" | |
| 170 VALIGN="TOP" | |
| 171 ><A | |
| 172 HREF="sdlkeyboardevent.html" | |
| 173 >Keyboard event</A | |
| 174 ></TD | |
| 175 ></TR | |
| 176 ><TR | |
| 177 ><TD | |
| 178 ALIGN="LEFT" | |
| 179 VALIGN="TOP" | |
| 180 ><TT | |
| 181 CLASS="STRUCTFIELD" | |
| 182 ><I | |
| 183 >motion</I | |
| 184 ></TT | |
| 185 ></TD | |
| 186 ><TD | |
| 187 ALIGN="LEFT" | |
| 188 VALIGN="TOP" | |
| 189 ><A | |
| 190 HREF="sdlmousemotionevent.html" | |
| 191 >Mouse motion event</A | |
| 192 ></TD | |
| 193 ></TR | |
| 194 ><TR | |
| 195 ><TD | |
| 196 ALIGN="LEFT" | |
| 197 VALIGN="TOP" | |
| 198 ><TT | |
| 199 CLASS="STRUCTFIELD" | |
| 200 ><I | |
| 201 >button</I | |
| 202 ></TT | |
| 203 ></TD | |
| 204 ><TD | |
| 205 ALIGN="LEFT" | |
| 206 VALIGN="TOP" | |
| 207 ><A | |
| 208 HREF="sdlmousebuttonevent.html" | |
| 209 >Mouse button event</A | |
| 210 ></TD | |
| 211 ></TR | |
| 212 ><TR | |
| 213 ><TD | |
| 214 ALIGN="LEFT" | |
| 215 VALIGN="TOP" | |
| 216 ><TT | |
| 217 CLASS="STRUCTFIELD" | |
| 218 ><I | |
| 219 >jaxis</I | |
| 220 ></TT | |
| 221 ></TD | |
| 222 ><TD | |
| 223 ALIGN="LEFT" | |
| 224 VALIGN="TOP" | |
| 225 ><A | |
| 226 HREF="sdljoyaxisevent.html" | |
| 227 >Joystick axis motion event</A | |
| 228 ></TD | |
| 229 ></TR | |
| 230 ><TR | |
| 231 ><TD | |
| 232 ALIGN="LEFT" | |
| 233 VALIGN="TOP" | |
| 234 ><TT | |
| 235 CLASS="STRUCTFIELD" | |
| 236 ><I | |
| 237 >jball</I | |
| 238 ></TT | |
| 239 ></TD | |
| 240 ><TD | |
| 241 ALIGN="LEFT" | |
| 242 VALIGN="TOP" | |
| 243 ><A | |
| 244 HREF="sdljoyballevent.html" | |
| 245 >Joystick trackball motion event</A | |
| 246 ></TD | |
| 247 ></TR | |
| 248 ><TR | |
| 249 ><TD | |
| 250 ALIGN="LEFT" | |
| 251 VALIGN="TOP" | |
| 252 ><TT | |
| 253 CLASS="STRUCTFIELD" | |
| 254 ><I | |
| 255 >jhat</I | |
| 256 ></TT | |
| 257 ></TD | |
| 258 ><TD | |
| 259 ALIGN="LEFT" | |
| 260 VALIGN="TOP" | |
| 261 ><A | |
| 262 HREF="sdljoyhatevent.html" | |
| 263 >Joystick hat motion event</A | |
| 264 ></TD | |
| 265 ></TR | |
| 266 ><TR | |
| 267 ><TD | |
| 268 ALIGN="LEFT" | |
| 269 VALIGN="TOP" | |
| 270 ><TT | |
| 271 CLASS="STRUCTFIELD" | |
| 272 ><I | |
| 273 >jbutton</I | |
| 274 ></TT | |
| 275 ></TD | |
| 276 ><TD | |
| 277 ALIGN="LEFT" | |
| 278 VALIGN="TOP" | |
| 279 ><A | |
| 280 HREF="sdljoybuttonevent.html" | |
| 281 >Joystick button event</A | |
| 282 ></TD | |
| 283 ></TR | |
| 284 ><TR | |
| 285 ><TD | |
| 286 ALIGN="LEFT" | |
| 287 VALIGN="TOP" | |
| 288 ><TT | |
| 289 CLASS="STRUCTFIELD" | |
| 290 ><I | |
| 291 >resize</I | |
| 292 ></TT | |
| 293 ></TD | |
| 294 ><TD | |
| 295 ALIGN="LEFT" | |
| 296 VALIGN="TOP" | |
| 297 ><A | |
| 298 HREF="sdlresizeevent.html" | |
| 299 >Application window resize event</A | |
| 300 ></TD | |
| 301 ></TR | |
| 302 ><TR | |
| 303 ><TD | |
| 304 ALIGN="LEFT" | |
| 305 VALIGN="TOP" | |
| 306 ><TT | |
| 307 CLASS="STRUCTFIELD" | |
| 308 ><I | |
|
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309 >expose</I |
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310 ></TT |
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311 ></TD |
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312 ><TD |
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313 ALIGN="LEFT" |
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314 VALIGN="TOP" |
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315 ><A |
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316 HREF="sdlexposeevent.html" |
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317 >Application window expose event</A |
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318 ></TD |
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319 ></TR |
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320 ><TR |
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321 ><TD |
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322 ALIGN="LEFT" |
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323 VALIGN="TOP" |
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324 ><TT |
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325 CLASS="STRUCTFIELD" |
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326 ><I |
| 0 | 327 >quit</I |
| 328 ></TT | |
| 329 ></TD | |
| 330 ><TD | |
| 331 ALIGN="LEFT" | |
| 332 VALIGN="TOP" | |
| 333 ><A | |
| 334 HREF="sdlquitevent.html" | |
| 335 >Application quit request event</A | |
| 336 ></TD | |
| 337 ></TR | |
| 338 ><TR | |
| 339 ><TD | |
| 340 ALIGN="LEFT" | |
| 341 VALIGN="TOP" | |
| 342 ><TT | |
| 343 CLASS="STRUCTFIELD" | |
| 344 ><I | |
| 345 >user</I | |
| 346 ></TT | |
| 347 ></TD | |
| 348 ><TD | |
| 349 ALIGN="LEFT" | |
| 350 VALIGN="TOP" | |
| 351 ><A | |
| 352 HREF="sdluserevent.html" | |
| 353 >User defined event</A | |
| 354 ></TD | |
| 355 ></TR | |
| 356 ><TR | |
| 357 ><TD | |
| 358 ALIGN="LEFT" | |
| 359 VALIGN="TOP" | |
| 360 ><TT | |
| 361 CLASS="STRUCTFIELD" | |
| 362 ><I | |
| 363 >syswm</I | |
| 364 ></TT | |
| 365 ></TD | |
| 366 ><TD | |
| 367 ALIGN="LEFT" | |
| 368 VALIGN="TOP" | |
| 369 ><A | |
| 370 HREF="sdlsyswmevent.html" | |
| 371 >Undefined window manager event</A | |
| 372 ></TD | |
| 373 ></TR | |
| 374 ></TBODY | |
| 375 ></TABLE | |
| 376 ><P | |
| 377 ></P | |
| 378 ></DIV | |
| 379 ></DIV | |
| 380 ><DIV | |
| 381 CLASS="REFSECT1" | |
| 382 ><A | |
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383 NAME="AEN3407" |
| 0 | 384 ></A |
| 385 ><H2 | |
| 386 >Description</H2 | |
| 387 ><P | |
| 388 >The <SPAN | |
| 389 CLASS="STRUCTNAME" | |
| 390 >SDL_Event</SPAN | |
| 391 > union is the core to all event handling is SDL, its probably the most important structure after <SPAN | |
| 392 CLASS="STRUCTNAME" | |
| 393 >SDL_Surface</SPAN | |
| 394 >. <SPAN | |
| 395 CLASS="STRUCTNAME" | |
| 396 >SDL_Event</SPAN | |
| 397 > 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 | |
| 398 CLASS="STRUCTFIELD" | |
| 399 ><I | |
| 400 >type</I | |
| 401 ></TT | |
| 402 >.</P | |
| 403 ><P | |
| 404 ><DIV | |
| 405 CLASS="INFORMALTABLE" | |
| 406 ><A | |
|
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407 NAME="AEN3415" |
| 0 | 408 ></A |
| 409 ><P | |
| 410 ></P | |
| 411 ><TABLE | |
| 412 BORDER="1" | |
| 413 CLASS="CALSTABLE" | |
| 414 ><THEAD | |
| 415 ><TR | |
| 416 ><TH | |
| 417 ALIGN="LEFT" | |
| 418 VALIGN="TOP" | |
| 419 >Event <TT | |
| 420 CLASS="STRUCTFIELD" | |
| 421 ><I | |
| 422 >type</I | |
| 423 ></TT | |
| 424 ></TH | |
| 425 ><TH | |
| 426 ALIGN="LEFT" | |
| 427 VALIGN="TOP" | |
| 428 >Event Structure</TH | |
| 429 ></TR | |
| 430 ></THEAD | |
| 431 ><TBODY | |
| 432 ><TR | |
| 433 ><TD | |
| 434 ALIGN="LEFT" | |
| 435 VALIGN="MIDDLE" | |
| 436 ><TT | |
| 437 CLASS="LITERAL" | |
| 438 >SDL_ACTIVEEVENT</TT | |
| 439 ></TD | |
| 440 ><TD | |
| 441 ALIGN="LEFT" | |
| 442 VALIGN="MIDDLE" | |
| 443 ><A | |
| 444 HREF="sdlactiveevent.html" | |
| 445 ><SPAN | |
| 446 CLASS="STRUCTNAME" | |
| 447 >SDL_ActiveEvent</SPAN | |
| 448 ></A | |
| 449 ></TD | |
| 450 ></TR | |
| 451 ><TR | |
| 452 ><TD | |
| 453 ALIGN="LEFT" | |
| 454 VALIGN="TOP" | |
| 455 ><TT | |
| 456 CLASS="LITERAL" | |
| 457 >SDL_KEYDOWN/UP</TT | |
| 458 ></TD | |
| 459 ><TD | |
| 460 ALIGN="LEFT" | |
| 461 VALIGN="TOP" | |
| 462 ><A | |
| 463 HREF="sdlkeyboardevent.html" | |
| 464 ><SPAN | |
| 465 CLASS="STRUCTNAME" | |
| 466 >SDL_KeyboardEvent</SPAN | |
| 467 ></A | |
| 468 ></TD | |
| 469 ></TR | |
| 470 ><TR | |
| 471 ><TD | |
| 472 ALIGN="LEFT" | |
| 473 VALIGN="TOP" | |
| 474 ><TT | |
| 475 CLASS="LITERAL" | |
| 476 >SDL_MOUSEMOTION</TT | |
| 477 ></TD | |
| 478 ><TD | |
| 479 ALIGN="LEFT" | |
| 480 VALIGN="TOP" | |
| 481 ><A | |
| 482 HREF="sdlmousemotionevent.html" | |
| 483 ><SPAN | |
| 484 CLASS="STRUCTNAME" | |
| 485 >SDL_MouseMotionEvent</SPAN | |
| 486 ></A | |
| 487 ></TD | |
| 488 ></TR | |
| 489 ><TR | |
| 490 ><TD | |
| 491 ALIGN="LEFT" | |
| 492 VALIGN="TOP" | |
| 493 ><TT | |
| 494 CLASS="LITERAL" | |
| 495 >SDL_MOUSEBUTTONDOWN/UP</TT | |
| 496 ></TD | |
| 497 ><TD | |
| 498 ALIGN="LEFT" | |
| 499 VALIGN="TOP" | |
| 500 ><A | |
| 501 HREF="sdlmousebuttonevent.html" | |
| 502 ><SPAN | |
| 503 CLASS="STRUCTNAME" | |
| 504 >SDL_MouseButtonEvent</SPAN | |
| 505 ></A | |
| 506 ></TD | |
| 507 ></TR | |
| 508 ><TR | |
| 509 ><TD | |
| 510 ALIGN="LEFT" | |
| 511 VALIGN="TOP" | |
| 512 ><TT | |
| 513 CLASS="LITERAL" | |
| 514 >SDL_JOYAXISMOTION</TT | |
| 515 ></TD | |
| 516 ><TD | |
| 517 ALIGN="LEFT" | |
| 518 VALIGN="TOP" | |
| 519 ><A | |
| 520 HREF="sdljoyaxisevent.html" | |
| 521 ><SPAN | |
| 522 CLASS="STRUCTNAME" | |
| 523 >SDL_JoyAxisEvent</SPAN | |
| 524 ></A | |
| 525 ></TD | |
| 526 ></TR | |
| 527 ><TR | |
| 528 ><TD | |
| 529 ALIGN="LEFT" | |
| 530 VALIGN="TOP" | |
| 531 ><TT | |
| 532 CLASS="LITERAL" | |
| 533 >SDL_JOYBALLMOTION</TT | |
| 534 ></TD | |
| 535 ><TD | |
| 536 ALIGN="LEFT" | |
| 537 VALIGN="TOP" | |
| 538 ><A | |
| 539 HREF="sdljoyballevent.html" | |
| 540 ><SPAN | |
| 541 CLASS="STRUCTNAME" | |
| 542 >SDL_JoyBallEvent</SPAN | |
| 543 ></A | |
| 544 ></TD | |
| 545 ></TR | |
| 546 ><TR | |
| 547 ><TD | |
| 548 ALIGN="LEFT" | |
| 549 VALIGN="TOP" | |
| 550 ><TT | |
| 551 CLASS="LITERAL" | |
| 552 >SDL_JOYHATMOTION</TT | |
| 553 ></TD | |
| 554 ><TD | |
| 555 ALIGN="LEFT" | |
| 556 VALIGN="TOP" | |
| 557 ><A | |
| 558 HREF="sdljoyhatevent.html" | |
| 559 ><SPAN | |
| 560 CLASS="STRUCTNAME" | |
| 561 >SDL_JoyHatEvent</SPAN | |
| 562 ></A | |
| 563 ></TD | |
| 564 ></TR | |
| 565 ><TR | |
| 566 ><TD | |
| 567 ALIGN="LEFT" | |
| 568 VALIGN="TOP" | |
| 569 ><TT | |
| 570 CLASS="LITERAL" | |
| 571 >SDL_JOYBUTTONDOWN/UP</TT | |
| 572 ></TD | |
| 573 ><TD | |
| 574 ALIGN="LEFT" | |
| 575 VALIGN="TOP" | |
| 576 ><A | |
| 577 HREF="sdljoybuttonevent.html" | |
| 578 ><SPAN | |
| 579 CLASS="STRUCTNAME" | |
| 580 >SDL_JoyButtonEvent</SPAN | |
| 581 ></A | |
| 582 ></TD | |
| 583 ></TR | |
| 584 ><TR | |
| 585 ><TD | |
| 586 ALIGN="LEFT" | |
| 587 VALIGN="TOP" | |
| 588 ><TT | |
| 589 CLASS="LITERAL" | |
| 590 >SDL_QUIT</TT | |
| 591 ></TD | |
| 592 ><TD | |
| 593 ALIGN="LEFT" | |
| 594 VALIGN="TOP" | |
| 595 ><A | |
| 596 HREF="sdlquitevent.html" | |
| 597 ><SPAN | |
| 598 CLASS="STRUCTNAME" | |
| 599 >SDL_QuitEvent</SPAN | |
| 600 ></A | |
| 601 ></TD | |
| 602 ></TR | |
| 603 ><TR | |
| 604 ><TD | |
| 605 ALIGN="LEFT" | |
| 606 VALIGN="TOP" | |
| 607 ><TT | |
| 608 CLASS="LITERAL" | |
| 609 >SDL_SYSWMEVENT</TT | |
| 610 ></TD | |
| 611 ><TD | |
| 612 ALIGN="LEFT" | |
| 613 VALIGN="TOP" | |
| 614 ><A | |
| 615 HREF="sdlsyswmevent.html" | |
| 616 ><SPAN | |
| 617 CLASS="STRUCTNAME" | |
| 618 >SDL_SysWMEvent</SPAN | |
| 619 ></A | |
| 620 ></TD | |
| 621 ></TR | |
| 622 ><TR | |
| 623 ><TD | |
| 624 ALIGN="LEFT" | |
| 625 VALIGN="TOP" | |
| 626 ><TT | |
| 627 CLASS="LITERAL" | |
| 628 >SDL_VIDEORESIZE</TT | |
| 629 ></TD | |
| 630 ><TD | |
| 631 ALIGN="LEFT" | |
| 632 VALIGN="TOP" | |
| 633 ><A | |
| 634 HREF="sdlresizeevent.html" | |
| 635 ><SPAN | |
| 636 CLASS="STRUCTNAME" | |
| 637 >SDL_ResizeEvent</SPAN | |
| 638 ></A | |
| 639 ></TD | |
| 640 ></TR | |
| 641 ><TR | |
| 642 ><TD | |
| 643 ALIGN="LEFT" | |
| 644 VALIGN="TOP" | |
| 645 ><TT | |
| 646 CLASS="LITERAL" | |
|
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647 >SDL_VIDEOEXPOSE</TT |
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648 ></TD |
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649 ><TD |
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650 ALIGN="LEFT" |
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651 VALIGN="TOP" |
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652 ><A |
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653 HREF="sdlexposeevent.html" |
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654 ><SPAN |
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655 CLASS="STRUCTNAME" |
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656 >SDL_ExposeEvent</SPAN |
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657 ></A |
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658 ></TD |
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659 ></TR |
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660 ><TR |
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661 ><TD |
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662 ALIGN="LEFT" |
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663 VALIGN="TOP" |
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664 ><TT |
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665 CLASS="LITERAL" |
| 0 | 666 >SDL_USEREVENT</TT |
| 667 ></TD | |
| 668 ><TD | |
| 669 ALIGN="LEFT" | |
| 670 VALIGN="TOP" | |
| 671 ><A | |
| 672 HREF="sdluserevent.html" | |
| 673 ><SPAN | |
| 674 CLASS="STRUCTNAME" | |
| 675 >SDL_UserEvent</SPAN | |
| 676 ></A | |
| 677 ></TD | |
| 678 ></TR | |
| 679 ></TBODY | |
| 680 ></TABLE | |
| 681 ><P | |
| 682 ></P | |
| 683 ></DIV | |
| 684 ></P | |
| 685 ></DIV | |
| 686 ><DIV | |
| 687 CLASS="REFSECT1" | |
| 688 ><A | |
|
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689 NAME="AEN3501" |
| 0 | 690 ></A |
| 691 ><H2 | |
| 692 >Use</H2 | |
| 693 ><P | |
| 694 >The <SPAN | |
| 695 CLASS="STRUCTNAME" | |
| 696 >SDL_Event</SPAN | |
| 697 > structure has two uses</P | |
| 698 ><P | |
| 699 ></P | |
| 700 ><UL | |
| 701 COMPACT="COMPACT" | |
| 702 ><LI | |
| 703 ><P | |
| 704 >Reading events on the event queue</P | |
| 705 ></LI | |
| 706 ><LI | |
| 707 ><P | |
| 708 >Placing events on the event queue</P | |
| 709 ></LI | |
| 710 ></UL | |
| 711 ><P | |
| 712 >Reading events from the event queue is done with either <A | |
| 713 HREF="sdlpollevent.html" | |
| 714 ><TT | |
| 715 CLASS="FUNCTION" | |
| 716 >SDL_PollEvent</TT | |
| 717 ></A | |
| 718 > or <A | |
| 719 HREF="sdlpeepevents.html" | |
| 720 ><TT | |
| 721 CLASS="FUNCTION" | |
| 722 >SDL_PeepEvents</TT | |
| 723 ></A | |
| 724 >. We'll use <TT | |
| 725 CLASS="FUNCTION" | |
| 726 >SDL_PollEvent</TT | |
| 727 > and step through an example.</P | |
| 728 ><P | |
| 729 >First off, we create an empty <SPAN | |
| 730 CLASS="STRUCTNAME" | |
| 731 >SDL_Event</SPAN | |
| 732 > structure. | |
| 733 <PRE | |
| 734 CLASS="PROGRAMLISTING" | |
| 735 >SDL_Event test_event;</PRE | |
| 736 > | |
| 737 <TT | |
| 738 CLASS="FUNCTION" | |
| 739 >SDL_PollEvent</TT | |
| 740 > removes the next event from the event queue, if there are no events on the queue it returns <SPAN | |
| 741 CLASS="RETURNVALUE" | |
| 742 >0</SPAN | |
| 743 > otherwise it returns <SPAN | |
| 744 CLASS="RETURNVALUE" | |
| 745 >1</SPAN | |
| 746 >. We use a <TT | |
| 747 CLASS="FUNCTION" | |
| 748 >while</TT | |
| 749 > loop to process each event in turn. | |
| 750 <PRE | |
| 751 CLASS="PROGRAMLISTING" | |
| 752 >while(SDL_PollEvent(&test_event)) {</PRE | |
| 753 > | |
| 754 The <TT | |
| 755 CLASS="FUNCTION" | |
| 756 >SDL_PollEvent</TT | |
| 757 > function take a pointer to an <SPAN | |
| 758 CLASS="STRUCTNAME" | |
| 759 >SDL_Event</SPAN | |
| 760 > structure that is to be filled with event information. We know that if <TT | |
| 761 CLASS="FUNCTION" | |
| 762 >SDL_PollEvent</TT | |
| 763 > removes an event from the queue then the event information will be placed in our <SPAN | |
| 764 CLASS="STRUCTNAME" | |
| 765 >test_event</SPAN | |
| 766 > structure, but we also know that the <I | |
| 767 CLASS="EMPHASIS" | |
| 768 >type</I | |
| 769 > of event will be placed in the <TT | |
| 770 CLASS="STRUCTFIELD" | |
| 771 ><I | |
| 772 >type</I | |
| 773 ></TT | |
| 774 > member of <SPAN | |
| 775 CLASS="STRUCTNAME" | |
| 776 >test_event</SPAN | |
| 777 >. So to handle each event <TT | |
| 778 CLASS="STRUCTFIELD" | |
| 779 ><I | |
| 780 >type</I | |
| 781 ></TT | |
| 782 > seperately we use a <TT | |
| 783 CLASS="FUNCTION" | |
| 784 >switch</TT | |
| 785 > statement. | |
| 786 <PRE | |
| 787 CLASS="PROGRAMLISTING" | |
| 788 > switch(test_event.type) {</PRE | |
| 789 > | |
| 790 We need to know what kind of events we're looking for <I | |
| 791 CLASS="EMPHASIS" | |
| 792 >and</I | |
| 793 > the event <TT | |
| 794 CLASS="STRUCTFIELD" | |
| 795 ><I | |
| 796 >type</I | |
| 797 ></TT | |
| 798 >'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 | |
| 799 CLASS="LITERAL" | |
| 800 >SDL_MOUSEMOTION</TT | |
| 801 > is, more than likely, the event we're looking for. A little <A | |
| 802 HREF="sdlmousemotionevent.html" | |
| 803 >more</A | |
| 804 > research tells use that <TT | |
| 805 CLASS="LITERAL" | |
| 806 >SDL_MOUSEMOTION</TT | |
| 807 > events are handled within the <A | |
| 808 HREF="sdlmousemotionevent.html" | |
| 809 ><SPAN | |
| 810 CLASS="STRUCTNAME" | |
| 811 >SDL_MouseMotionEvent</SPAN | |
| 812 ></A | |
| 813 > structure which is the <TT | |
| 814 CLASS="STRUCTFIELD" | |
| 815 ><I | |
| 816 >motion</I | |
| 817 ></TT | |
| 818 > member of <SPAN | |
| 819 CLASS="STRUCTNAME" | |
| 820 >SDL_Event</SPAN | |
| 821 >. We can check for the <TT | |
| 822 CLASS="LITERAL" | |
| 823 >SDL_MOUSEMOTION</TT | |
| 824 > event <TT | |
| 825 CLASS="STRUCTFIELD" | |
| 826 ><I | |
| 827 >type</I | |
| 828 ></TT | |
| 829 > within our <TT | |
| 830 CLASS="FUNCTION" | |
| 831 >switch</TT | |
| 832 > statement like so: | |
| 833 <PRE | |
| 834 CLASS="PROGRAMLISTING" | |
| 835 > case SDL_MOUSEMOTION:</PRE | |
| 836 > | |
| 837 All we need do now is read the information out of the <TT | |
| 838 CLASS="STRUCTFIELD" | |
| 839 ><I | |
| 840 >motion</I | |
| 841 ></TT | |
| 842 > member of <SPAN | |
| 843 CLASS="STRUCTNAME" | |
| 844 >test_event</SPAN | |
| 845 >. | |
| 846 <PRE | |
| 847 CLASS="PROGRAMLISTING" | |
| 848 > printf("We got a motion event.\n"); | |
| 849 printf("Current mouse position is: (%d, %d)\n", test_event.motion.x, test_event.motion.y); | |
| 850 break; | |
| 851 default: | |
| 852 printf("Unhandled Event!\n"); | |
| 853 break; | |
| 854 } | |
| 855 } | |
| 856 printf("Event queue empty.\n");</PRE | |
| 857 ></P | |
| 858 ><P | |
| 859 >It is also possible to push events onto the event queue and so use it as a two-way communication path. Both <A | |
| 860 HREF="sdlpushevent.html" | |
| 861 ><TT | |
| 862 CLASS="FUNCTION" | |
| 863 >SDL_PushEvent</TT | |
| 864 ></A | |
| 865 > and <A | |
| 866 HREF="sdlpeepevents.html" | |
| 867 ><TT | |
| 868 CLASS="FUNCTION" | |
| 869 >SDL_PeepEvents</TT | |
| 870 ></A | |
| 871 > allow you to place events onto the event queue. This is usually used to place a <TT | |
| 872 CLASS="LITERAL" | |
| 873 >SDL_USEREVENT</TT | |
| 874 > 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 | |
| 875 CLASS="STRUCTFIELD" | |
| 876 ><I | |
| 877 >type</I | |
| 878 ></TT | |
| 879 > member and filling the appropriate member structure with information. | |
| 880 <PRE | |
| 881 CLASS="PROGRAMLISTING" | |
| 882 >SDL_Event user_event; | |
| 883 | |
| 884 user_event.type=SDL_USEREVENT; | |
| 885 user_event.user.code=2; | |
| 886 user_event.user.data1=NULL; | |
| 887 user_event.user.data2=NULL; | |
| 888 SDL_PushEvent(&user_event);</PRE | |
| 889 ></P | |
| 890 ></DIV | |
| 891 ><DIV | |
| 892 CLASS="REFSECT1" | |
| 893 ><A | |
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894 NAME="AEN3558" |
| 0 | 895 ></A |
| 896 ><H2 | |
| 897 >See Also</H2 | |
| 898 ><P | |
| 899 ><A | |
| 900 HREF="sdlpollevent.html" | |
| 901 ><TT | |
| 902 CLASS="FUNCTION" | |
| 903 >SDL_PollEvent</TT | |
| 904 ></A | |
| 905 >, | |
| 906 <A | |
| 907 HREF="sdlpushevent.html" | |
| 908 ><TT | |
| 909 CLASS="FUNCTION" | |
| 910 >SDL_PushEvent</TT | |
| 911 ></A | |
| 912 >, | |
| 913 <A | |
| 914 HREF="sdlpeepevents.html" | |
| 915 ><TT | |
| 916 CLASS="FUNCTION" | |
| 917 >SDL_PeepEvents</TT | |
| 918 ></A | |
| 919 ></P | |
| 920 ></DIV | |
| 921 ><DIV | |
| 922 CLASS="NAVFOOTER" | |
| 923 ><HR | |
| 924 ALIGN="LEFT" | |
| 925 WIDTH="100%"><TABLE | |
| 926 WIDTH="100%" | |
| 927 BORDER="0" | |
| 928 CELLPADDING="0" | |
| 929 CELLSPACING="0" | |
| 930 ><TR | |
| 931 ><TD | |
| 932 WIDTH="33%" | |
| 933 ALIGN="left" | |
| 934 VALIGN="top" | |
| 935 ><A | |
| 936 HREF="eventstructures.html" | |
| 937 >Prev</A | |
| 938 ></TD | |
| 939 ><TD | |
| 940 WIDTH="34%" | |
| 941 ALIGN="center" | |
| 942 VALIGN="top" | |
| 943 ><A | |
| 944 HREF="index.html" | |
| 945 >Home</A | |
| 946 ></TD | |
| 947 ><TD | |
| 948 WIDTH="33%" | |
| 949 ALIGN="right" | |
| 950 VALIGN="top" | |
| 951 ><A | |
| 952 HREF="sdlactiveevent.html" | |
| 953 >Next</A | |
| 954 ></TD | |
| 955 ></TR | |
| 956 ><TR | |
| 957 ><TD | |
| 958 WIDTH="33%" | |
| 959 ALIGN="left" | |
| 960 VALIGN="top" | |
| 961 >SDL Event Structures.</TD | |
| 962 ><TD | |
| 963 WIDTH="34%" | |
| 964 ALIGN="center" | |
| 965 VALIGN="top" | |
| 966 ><A | |
| 967 HREF="eventstructures.html" | |
| 968 >Up</A | |
| 969 ></TD | |
| 970 ><TD | |
| 971 WIDTH="33%" | |
| 972 ALIGN="right" | |
| 973 VALIGN="top" | |
| 974 >SDL_ActiveEvent</TD | |
| 975 ></TR | |
| 976 ></TABLE | |
| 977 ></DIV | |
| 978 ></BODY | |
| 979 ></HTML | |
| 980 > |