Mercurial > sdl-ios-xcode
annotate docs/html/sdlevent.html @ 77:1e7e61b9b0f9
Don't crash if freeing a cursor after quit...
| author | Sam Lantinga <slouken@lokigames.com> |
|---|---|
| date | Tue, 19 Jun 2001 21:07:12 +0000 |
| parents | 55f1f1b3e27d |
| children | e5bc29de3f0a |
| 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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diff
changeset
|
76 NAME="AEN3289" |
| 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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changeset
|
84 NAME="AEN3292" |
| 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; | |
| 101 SDL_QuitEvent quit; | |
| 102 SDL_UserEvent user; | |
| 103 SDL_SywWMEvent syswm; | |
| 104 } SDL_Event;</PRE | |
| 105 ></DIV | |
| 106 ><DIV | |
| 107 CLASS="REFSECT1" | |
| 108 ><A | |
|
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changeset
|
109 NAME="AEN3295" |
| 0 | 110 ></A |
| 111 ><H2 | |
| 112 >Structure Data</H2 | |
| 113 ><DIV | |
| 114 CLASS="INFORMALTABLE" | |
| 115 ><A | |
|
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changeset
|
116 NAME="AEN3297" |
| 0 | 117 ></A |
| 118 ><P | |
| 119 ></P | |
| 120 ><TABLE | |
| 121 BORDER="0" | |
| 122 CLASS="CALSTABLE" | |
| 123 ><TBODY | |
| 124 ><TR | |
| 125 ><TD | |
| 126 ALIGN="LEFT" | |
| 127 VALIGN="TOP" | |
| 128 ><TT | |
| 129 CLASS="STRUCTFIELD" | |
| 130 ><I | |
| 131 >type</I | |
| 132 ></TT | |
| 133 ></TD | |
| 134 ><TD | |
| 135 ALIGN="LEFT" | |
| 136 VALIGN="TOP" | |
| 137 >The type of event</TD | |
| 138 ></TR | |
| 139 ><TR | |
| 140 ><TD | |
| 141 ALIGN="LEFT" | |
| 142 VALIGN="TOP" | |
| 143 ><TT | |
| 144 CLASS="STRUCTFIELD" | |
| 145 ><I | |
| 146 >active</I | |
| 147 ></TT | |
| 148 ></TD | |
| 149 ><TD | |
| 150 ALIGN="LEFT" | |
| 151 VALIGN="TOP" | |
| 152 ><A | |
| 153 HREF="sdlactiveevent.html" | |
| 154 >Activation event</A | |
| 155 ></TD | |
| 156 ></TR | |
| 157 ><TR | |
| 158 ><TD | |
| 159 ALIGN="LEFT" | |
| 160 VALIGN="TOP" | |
| 161 ><TT | |
| 162 CLASS="STRUCTFIELD" | |
| 163 ><I | |
| 164 >key</I | |
| 165 ></TT | |
| 166 ></TD | |
| 167 ><TD | |
| 168 ALIGN="LEFT" | |
| 169 VALIGN="TOP" | |
| 170 ><A | |
| 171 HREF="sdlkeyboardevent.html" | |
| 172 >Keyboard event</A | |
| 173 ></TD | |
| 174 ></TR | |
| 175 ><TR | |
| 176 ><TD | |
| 177 ALIGN="LEFT" | |
| 178 VALIGN="TOP" | |
| 179 ><TT | |
| 180 CLASS="STRUCTFIELD" | |
| 181 ><I | |
| 182 >motion</I | |
| 183 ></TT | |
| 184 ></TD | |
| 185 ><TD | |
| 186 ALIGN="LEFT" | |
| 187 VALIGN="TOP" | |
| 188 ><A | |
| 189 HREF="sdlmousemotionevent.html" | |
| 190 >Mouse motion event</A | |
| 191 ></TD | |
| 192 ></TR | |
| 193 ><TR | |
| 194 ><TD | |
| 195 ALIGN="LEFT" | |
| 196 VALIGN="TOP" | |
| 197 ><TT | |
| 198 CLASS="STRUCTFIELD" | |
| 199 ><I | |
| 200 >button</I | |
| 201 ></TT | |
| 202 ></TD | |
| 203 ><TD | |
| 204 ALIGN="LEFT" | |
| 205 VALIGN="TOP" | |
| 206 ><A | |
| 207 HREF="sdlmousebuttonevent.html" | |
| 208 >Mouse button event</A | |
| 209 ></TD | |
| 210 ></TR | |
| 211 ><TR | |
| 212 ><TD | |
| 213 ALIGN="LEFT" | |
| 214 VALIGN="TOP" | |
| 215 ><TT | |
| 216 CLASS="STRUCTFIELD" | |
| 217 ><I | |
| 218 >jaxis</I | |
| 219 ></TT | |
| 220 ></TD | |
| 221 ><TD | |
| 222 ALIGN="LEFT" | |
| 223 VALIGN="TOP" | |
| 224 ><A | |
| 225 HREF="sdljoyaxisevent.html" | |
| 226 >Joystick axis motion event</A | |
| 227 ></TD | |
| 228 ></TR | |
| 229 ><TR | |
| 230 ><TD | |
| 231 ALIGN="LEFT" | |
| 232 VALIGN="TOP" | |
| 233 ><TT | |
| 234 CLASS="STRUCTFIELD" | |
| 235 ><I | |
| 236 >jball</I | |
| 237 ></TT | |
| 238 ></TD | |
| 239 ><TD | |
| 240 ALIGN="LEFT" | |
| 241 VALIGN="TOP" | |
| 242 ><A | |
| 243 HREF="sdljoyballevent.html" | |
| 244 >Joystick trackball motion event</A | |
| 245 ></TD | |
| 246 ></TR | |
| 247 ><TR | |
| 248 ><TD | |
| 249 ALIGN="LEFT" | |
| 250 VALIGN="TOP" | |
| 251 ><TT | |
| 252 CLASS="STRUCTFIELD" | |
| 253 ><I | |
| 254 >jhat</I | |
| 255 ></TT | |
| 256 ></TD | |
| 257 ><TD | |
| 258 ALIGN="LEFT" | |
| 259 VALIGN="TOP" | |
| 260 ><A | |
| 261 HREF="sdljoyhatevent.html" | |
| 262 >Joystick hat motion event</A | |
| 263 ></TD | |
| 264 ></TR | |
| 265 ><TR | |
| 266 ><TD | |
| 267 ALIGN="LEFT" | |
| 268 VALIGN="TOP" | |
| 269 ><TT | |
| 270 CLASS="STRUCTFIELD" | |
| 271 ><I | |
| 272 >jbutton</I | |
| 273 ></TT | |
| 274 ></TD | |
| 275 ><TD | |
| 276 ALIGN="LEFT" | |
| 277 VALIGN="TOP" | |
| 278 ><A | |
| 279 HREF="sdljoybuttonevent.html" | |
| 280 >Joystick button event</A | |
| 281 ></TD | |
| 282 ></TR | |
| 283 ><TR | |
| 284 ><TD | |
| 285 ALIGN="LEFT" | |
| 286 VALIGN="TOP" | |
| 287 ><TT | |
| 288 CLASS="STRUCTFIELD" | |
| 289 ><I | |
| 290 >resize</I | |
| 291 ></TT | |
| 292 ></TD | |
| 293 ><TD | |
| 294 ALIGN="LEFT" | |
| 295 VALIGN="TOP" | |
| 296 ><A | |
| 297 HREF="sdlresizeevent.html" | |
| 298 >Application window resize event</A | |
| 299 ></TD | |
| 300 ></TR | |
| 301 ><TR | |
| 302 ><TD | |
| 303 ALIGN="LEFT" | |
| 304 VALIGN="TOP" | |
| 305 ><TT | |
| 306 CLASS="STRUCTFIELD" | |
| 307 ><I | |
| 308 >quit</I | |
| 309 ></TT | |
| 310 ></TD | |
| 311 ><TD | |
| 312 ALIGN="LEFT" | |
| 313 VALIGN="TOP" | |
| 314 ><A | |
| 315 HREF="sdlquitevent.html" | |
| 316 >Application quit request event</A | |
| 317 ></TD | |
| 318 ></TR | |
| 319 ><TR | |
| 320 ><TD | |
| 321 ALIGN="LEFT" | |
| 322 VALIGN="TOP" | |
| 323 ><TT | |
| 324 CLASS="STRUCTFIELD" | |
| 325 ><I | |
| 326 >user</I | |
| 327 ></TT | |
| 328 ></TD | |
| 329 ><TD | |
| 330 ALIGN="LEFT" | |
| 331 VALIGN="TOP" | |
| 332 ><A | |
| 333 HREF="sdluserevent.html" | |
| 334 >User defined event</A | |
| 335 ></TD | |
| 336 ></TR | |
| 337 ><TR | |
| 338 ><TD | |
| 339 ALIGN="LEFT" | |
| 340 VALIGN="TOP" | |
| 341 ><TT | |
| 342 CLASS="STRUCTFIELD" | |
| 343 ><I | |
| 344 >syswm</I | |
| 345 ></TT | |
| 346 ></TD | |
| 347 ><TD | |
| 348 ALIGN="LEFT" | |
| 349 VALIGN="TOP" | |
| 350 ><A | |
| 351 HREF="sdlsyswmevent.html" | |
| 352 >Undefined window manager event</A | |
| 353 ></TD | |
| 354 ></TR | |
| 355 ></TBODY | |
| 356 ></TABLE | |
| 357 ><P | |
| 358 ></P | |
| 359 ></DIV | |
| 360 ></DIV | |
| 361 ><DIV | |
| 362 CLASS="REFSECT1" | |
| 363 ><A | |
|
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diff
changeset
|
364 NAME="AEN3364" |
| 0 | 365 ></A |
| 366 ><H2 | |
| 367 >Description</H2 | |
| 368 ><P | |
| 369 >The <SPAN | |
| 370 CLASS="STRUCTNAME" | |
| 371 >SDL_Event</SPAN | |
| 372 > union is the core to all event handling is SDL, its probably the most important structure after <SPAN | |
| 373 CLASS="STRUCTNAME" | |
| 374 >SDL_Surface</SPAN | |
| 375 >. <SPAN | |
| 376 CLASS="STRUCTNAME" | |
| 377 >SDL_Event</SPAN | |
| 378 > 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 | |
| 379 CLASS="STRUCTFIELD" | |
| 380 ><I | |
| 381 >type</I | |
| 382 ></TT | |
| 383 >.</P | |
| 384 ><P | |
| 385 ><DIV | |
| 386 CLASS="INFORMALTABLE" | |
| 387 ><A | |
|
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diff
changeset
|
388 NAME="AEN3372" |
| 0 | 389 ></A |
| 390 ><P | |
| 391 ></P | |
| 392 ><TABLE | |
| 393 BORDER="1" | |
| 394 CLASS="CALSTABLE" | |
| 395 ><THEAD | |
| 396 ><TR | |
| 397 ><TH | |
| 398 ALIGN="LEFT" | |
| 399 VALIGN="TOP" | |
| 400 >Event <TT | |
| 401 CLASS="STRUCTFIELD" | |
| 402 ><I | |
| 403 >type</I | |
| 404 ></TT | |
| 405 ></TH | |
| 406 ><TH | |
| 407 ALIGN="LEFT" | |
| 408 VALIGN="TOP" | |
| 409 >Event Structure</TH | |
| 410 ></TR | |
| 411 ></THEAD | |
| 412 ><TBODY | |
| 413 ><TR | |
| 414 ><TD | |
| 415 ALIGN="LEFT" | |
| 416 VALIGN="MIDDLE" | |
| 417 ><TT | |
| 418 CLASS="LITERAL" | |
| 419 >SDL_ACTIVEEVENT</TT | |
| 420 ></TD | |
| 421 ><TD | |
| 422 ALIGN="LEFT" | |
| 423 VALIGN="MIDDLE" | |
| 424 ><A | |
| 425 HREF="sdlactiveevent.html" | |
| 426 ><SPAN | |
| 427 CLASS="STRUCTNAME" | |
| 428 >SDL_ActiveEvent</SPAN | |
| 429 ></A | |
| 430 ></TD | |
| 431 ></TR | |
| 432 ><TR | |
| 433 ><TD | |
| 434 ALIGN="LEFT" | |
| 435 VALIGN="TOP" | |
| 436 ><TT | |
| 437 CLASS="LITERAL" | |
| 438 >SDL_KEYDOWN/UP</TT | |
| 439 ></TD | |
| 440 ><TD | |
| 441 ALIGN="LEFT" | |
| 442 VALIGN="TOP" | |
| 443 ><A | |
| 444 HREF="sdlkeyboardevent.html" | |
| 445 ><SPAN | |
| 446 CLASS="STRUCTNAME" | |
| 447 >SDL_KeyboardEvent</SPAN | |
| 448 ></A | |
| 449 ></TD | |
| 450 ></TR | |
| 451 ><TR | |
| 452 ><TD | |
| 453 ALIGN="LEFT" | |
| 454 VALIGN="TOP" | |
| 455 ><TT | |
| 456 CLASS="LITERAL" | |
| 457 >SDL_MOUSEMOTION</TT | |
| 458 ></TD | |
| 459 ><TD | |
| 460 ALIGN="LEFT" | |
| 461 VALIGN="TOP" | |
| 462 ><A | |
| 463 HREF="sdlmousemotionevent.html" | |
| 464 ><SPAN | |
| 465 CLASS="STRUCTNAME" | |
| 466 >SDL_MouseMotionEvent</SPAN | |
| 467 ></A | |
| 468 ></TD | |
| 469 ></TR | |
| 470 ><TR | |
| 471 ><TD | |
| 472 ALIGN="LEFT" | |
| 473 VALIGN="TOP" | |
| 474 ><TT | |
| 475 CLASS="LITERAL" | |
| 476 >SDL_MOUSEBUTTONDOWN/UP</TT | |
| 477 ></TD | |
| 478 ><TD | |
| 479 ALIGN="LEFT" | |
| 480 VALIGN="TOP" | |
| 481 ><A | |
| 482 HREF="sdlmousebuttonevent.html" | |
| 483 ><SPAN | |
| 484 CLASS="STRUCTNAME" | |
| 485 >SDL_MouseButtonEvent</SPAN | |
| 486 ></A | |
| 487 ></TD | |
| 488 ></TR | |
| 489 ><TR | |
| 490 ><TD | |
| 491 ALIGN="LEFT" | |
| 492 VALIGN="TOP" | |
| 493 ><TT | |
| 494 CLASS="LITERAL" | |
| 495 >SDL_JOYAXISMOTION</TT | |
| 496 ></TD | |
| 497 ><TD | |
| 498 ALIGN="LEFT" | |
| 499 VALIGN="TOP" | |
| 500 ><A | |
| 501 HREF="sdljoyaxisevent.html" | |
| 502 ><SPAN | |
| 503 CLASS="STRUCTNAME" | |
| 504 >SDL_JoyAxisEvent</SPAN | |
| 505 ></A | |
| 506 ></TD | |
| 507 ></TR | |
| 508 ><TR | |
| 509 ><TD | |
| 510 ALIGN="LEFT" | |
| 511 VALIGN="TOP" | |
| 512 ><TT | |
| 513 CLASS="LITERAL" | |
| 514 >SDL_JOYBALLMOTION</TT | |
| 515 ></TD | |
| 516 ><TD | |
| 517 ALIGN="LEFT" | |
| 518 VALIGN="TOP" | |
| 519 ><A | |
| 520 HREF="sdljoyballevent.html" | |
| 521 ><SPAN | |
| 522 CLASS="STRUCTNAME" | |
| 523 >SDL_JoyBallEvent</SPAN | |
| 524 ></A | |
| 525 ></TD | |
| 526 ></TR | |
| 527 ><TR | |
| 528 ><TD | |
| 529 ALIGN="LEFT" | |
| 530 VALIGN="TOP" | |
| 531 ><TT | |
| 532 CLASS="LITERAL" | |
| 533 >SDL_JOYHATMOTION</TT | |
| 534 ></TD | |
| 535 ><TD | |
| 536 ALIGN="LEFT" | |
| 537 VALIGN="TOP" | |
| 538 ><A | |
| 539 HREF="sdljoyhatevent.html" | |
| 540 ><SPAN | |
| 541 CLASS="STRUCTNAME" | |
| 542 >SDL_JoyHatEvent</SPAN | |
| 543 ></A | |
| 544 ></TD | |
| 545 ></TR | |
| 546 ><TR | |
| 547 ><TD | |
| 548 ALIGN="LEFT" | |
| 549 VALIGN="TOP" | |
| 550 ><TT | |
| 551 CLASS="LITERAL" | |
| 552 >SDL_JOYBUTTONDOWN/UP</TT | |
| 553 ></TD | |
| 554 ><TD | |
| 555 ALIGN="LEFT" | |
| 556 VALIGN="TOP" | |
| 557 ><A | |
| 558 HREF="sdljoybuttonevent.html" | |
| 559 ><SPAN | |
| 560 CLASS="STRUCTNAME" | |
| 561 >SDL_JoyButtonEvent</SPAN | |
| 562 ></A | |
| 563 ></TD | |
| 564 ></TR | |
| 565 ><TR | |
| 566 ><TD | |
| 567 ALIGN="LEFT" | |
| 568 VALIGN="TOP" | |
| 569 ><TT | |
| 570 CLASS="LITERAL" | |
| 571 >SDL_QUIT</TT | |
| 572 ></TD | |
| 573 ><TD | |
| 574 ALIGN="LEFT" | |
| 575 VALIGN="TOP" | |
| 576 ><A | |
| 577 HREF="sdlquitevent.html" | |
| 578 ><SPAN | |
| 579 CLASS="STRUCTNAME" | |
| 580 >SDL_QuitEvent</SPAN | |
| 581 ></A | |
| 582 ></TD | |
| 583 ></TR | |
| 584 ><TR | |
| 585 ><TD | |
| 586 ALIGN="LEFT" | |
| 587 VALIGN="TOP" | |
| 588 ><TT | |
| 589 CLASS="LITERAL" | |
| 590 >SDL_SYSWMEVENT</TT | |
| 591 ></TD | |
| 592 ><TD | |
| 593 ALIGN="LEFT" | |
| 594 VALIGN="TOP" | |
| 595 ><A | |
| 596 HREF="sdlsyswmevent.html" | |
| 597 ><SPAN | |
| 598 CLASS="STRUCTNAME" | |
| 599 >SDL_SysWMEvent</SPAN | |
| 600 ></A | |
| 601 ></TD | |
| 602 ></TR | |
| 603 ><TR | |
| 604 ><TD | |
| 605 ALIGN="LEFT" | |
| 606 VALIGN="TOP" | |
| 607 ><TT | |
| 608 CLASS="LITERAL" | |
| 609 >SDL_VIDEORESIZE</TT | |
| 610 ></TD | |
| 611 ><TD | |
| 612 ALIGN="LEFT" | |
| 613 VALIGN="TOP" | |
| 614 ><A | |
| 615 HREF="sdlresizeevent.html" | |
| 616 ><SPAN | |
| 617 CLASS="STRUCTNAME" | |
| 618 >SDL_ResizeEvent</SPAN | |
| 619 ></A | |
| 620 ></TD | |
| 621 ></TR | |
| 622 ><TR | |
| 623 ><TD | |
| 624 ALIGN="LEFT" | |
| 625 VALIGN="TOP" | |
| 626 ><TT | |
| 627 CLASS="LITERAL" | |
| 628 >SDL_USEREVENT</TT | |
| 629 ></TD | |
| 630 ><TD | |
| 631 ALIGN="LEFT" | |
| 632 VALIGN="TOP" | |
| 633 ><A | |
| 634 HREF="sdluserevent.html" | |
| 635 ><SPAN | |
| 636 CLASS="STRUCTNAME" | |
| 637 >SDL_UserEvent</SPAN | |
| 638 ></A | |
| 639 ></TD | |
| 640 ></TR | |
| 641 ></TBODY | |
| 642 ></TABLE | |
| 643 ><P | |
| 644 ></P | |
| 645 ></DIV | |
| 646 ></P | |
| 647 ></DIV | |
| 648 ><DIV | |
| 649 CLASS="REFSECT1" | |
| 650 ><A | |
|
55
55f1f1b3e27d
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Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
651 NAME="AEN3452" |
| 0 | 652 ></A |
| 653 ><H2 | |
| 654 >Use</H2 | |
| 655 ><P | |
| 656 >The <SPAN | |
| 657 CLASS="STRUCTNAME" | |
| 658 >SDL_Event</SPAN | |
| 659 > structure has two uses</P | |
| 660 ><P | |
| 661 ></P | |
| 662 ><UL | |
| 663 COMPACT="COMPACT" | |
| 664 ><LI | |
| 665 ><P | |
| 666 >Reading events on the event queue</P | |
| 667 ></LI | |
| 668 ><LI | |
| 669 ><P | |
| 670 >Placing events on the event queue</P | |
| 671 ></LI | |
| 672 ></UL | |
| 673 ><P | |
| 674 >Reading events from the event queue is done with either <A | |
| 675 HREF="sdlpollevent.html" | |
| 676 ><TT | |
| 677 CLASS="FUNCTION" | |
| 678 >SDL_PollEvent</TT | |
| 679 ></A | |
| 680 > or <A | |
| 681 HREF="sdlpeepevents.html" | |
| 682 ><TT | |
| 683 CLASS="FUNCTION" | |
| 684 >SDL_PeepEvents</TT | |
| 685 ></A | |
| 686 >. We'll use <TT | |
| 687 CLASS="FUNCTION" | |
| 688 >SDL_PollEvent</TT | |
| 689 > and step through an example.</P | |
| 690 ><P | |
| 691 >First off, we create an empty <SPAN | |
| 692 CLASS="STRUCTNAME" | |
| 693 >SDL_Event</SPAN | |
| 694 > structure. | |
| 695 <PRE | |
| 696 CLASS="PROGRAMLISTING" | |
| 697 >SDL_Event test_event;</PRE | |
| 698 > | |
| 699 <TT | |
| 700 CLASS="FUNCTION" | |
| 701 >SDL_PollEvent</TT | |
| 702 > removes the next event from the event queue, if there are no events on the queue it returns <SPAN | |
| 703 CLASS="RETURNVALUE" | |
| 704 >0</SPAN | |
| 705 > otherwise it returns <SPAN | |
| 706 CLASS="RETURNVALUE" | |
| 707 >1</SPAN | |
| 708 >. We use a <TT | |
| 709 CLASS="FUNCTION" | |
| 710 >while</TT | |
| 711 > loop to process each event in turn. | |
| 712 <PRE | |
| 713 CLASS="PROGRAMLISTING" | |
| 714 >while(SDL_PollEvent(&test_event)) {</PRE | |
| 715 > | |
| 716 The <TT | |
| 717 CLASS="FUNCTION" | |
| 718 >SDL_PollEvent</TT | |
| 719 > function take a pointer to an <SPAN | |
| 720 CLASS="STRUCTNAME" | |
| 721 >SDL_Event</SPAN | |
| 722 > structure that is to be filled with event information. We know that if <TT | |
| 723 CLASS="FUNCTION" | |
| 724 >SDL_PollEvent</TT | |
| 725 > removes an event from the queue then the event information will be placed in our <SPAN | |
| 726 CLASS="STRUCTNAME" | |
| 727 >test_event</SPAN | |
| 728 > structure, but we also know that the <I | |
| 729 CLASS="EMPHASIS" | |
| 730 >type</I | |
| 731 > of event will be placed in the <TT | |
| 732 CLASS="STRUCTFIELD" | |
| 733 ><I | |
| 734 >type</I | |
| 735 ></TT | |
| 736 > member of <SPAN | |
| 737 CLASS="STRUCTNAME" | |
| 738 >test_event</SPAN | |
| 739 >. So to handle each event <TT | |
| 740 CLASS="STRUCTFIELD" | |
| 741 ><I | |
| 742 >type</I | |
| 743 ></TT | |
| 744 > seperately we use a <TT | |
| 745 CLASS="FUNCTION" | |
| 746 >switch</TT | |
| 747 > statement. | |
| 748 <PRE | |
| 749 CLASS="PROGRAMLISTING" | |
| 750 > switch(test_event.type) {</PRE | |
| 751 > | |
| 752 We need to know what kind of events we're looking for <I | |
| 753 CLASS="EMPHASIS" | |
| 754 >and</I | |
| 755 > the event <TT | |
| 756 CLASS="STRUCTFIELD" | |
| 757 ><I | |
| 758 >type</I | |
| 759 ></TT | |
| 760 >'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 | |
| 761 CLASS="LITERAL" | |
| 762 >SDL_MOUSEMOTION</TT | |
| 763 > is, more than likely, the event we're looking for. A little <A | |
| 764 HREF="sdlmousemotionevent.html" | |
| 765 >more</A | |
| 766 > research tells use that <TT | |
| 767 CLASS="LITERAL" | |
| 768 >SDL_MOUSEMOTION</TT | |
| 769 > events are handled within the <A | |
| 770 HREF="sdlmousemotionevent.html" | |
| 771 ><SPAN | |
| 772 CLASS="STRUCTNAME" | |
| 773 >SDL_MouseMotionEvent</SPAN | |
| 774 ></A | |
| 775 > structure which is the <TT | |
| 776 CLASS="STRUCTFIELD" | |
| 777 ><I | |
| 778 >motion</I | |
| 779 ></TT | |
| 780 > member of <SPAN | |
| 781 CLASS="STRUCTNAME" | |
| 782 >SDL_Event</SPAN | |
| 783 >. We can check for the <TT | |
| 784 CLASS="LITERAL" | |
| 785 >SDL_MOUSEMOTION</TT | |
| 786 > event <TT | |
| 787 CLASS="STRUCTFIELD" | |
| 788 ><I | |
| 789 >type</I | |
| 790 ></TT | |
| 791 > within our <TT | |
| 792 CLASS="FUNCTION" | |
| 793 >switch</TT | |
| 794 > statement like so: | |
| 795 <PRE | |
| 796 CLASS="PROGRAMLISTING" | |
| 797 > case SDL_MOUSEMOTION:</PRE | |
| 798 > | |
| 799 All we need do now is read the information out of the <TT | |
| 800 CLASS="STRUCTFIELD" | |
| 801 ><I | |
| 802 >motion</I | |
| 803 ></TT | |
| 804 > member of <SPAN | |
| 805 CLASS="STRUCTNAME" | |
| 806 >test_event</SPAN | |
| 807 >. | |
| 808 <PRE | |
| 809 CLASS="PROGRAMLISTING" | |
| 810 > printf("We got a motion event.\n"); | |
| 811 printf("Current mouse position is: (%d, %d)\n", test_event.motion.x, test_event.motion.y); | |
| 812 break; | |
| 813 default: | |
| 814 printf("Unhandled Event!\n"); | |
| 815 break; | |
| 816 } | |
| 817 } | |
| 818 printf("Event queue empty.\n");</PRE | |
| 819 ></P | |
| 820 ><P | |
| 821 >It is also possible to push events onto the event queue and so use it as a two-way communication path. Both <A | |
| 822 HREF="sdlpushevent.html" | |
| 823 ><TT | |
| 824 CLASS="FUNCTION" | |
| 825 >SDL_PushEvent</TT | |
| 826 ></A | |
| 827 > and <A | |
| 828 HREF="sdlpeepevents.html" | |
| 829 ><TT | |
| 830 CLASS="FUNCTION" | |
| 831 >SDL_PeepEvents</TT | |
| 832 ></A | |
| 833 > allow you to place events onto the event queue. This is usually used to place a <TT | |
| 834 CLASS="LITERAL" | |
| 835 >SDL_USEREVENT</TT | |
| 836 > 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 | |
| 837 CLASS="STRUCTFIELD" | |
| 838 ><I | |
| 839 >type</I | |
| 840 ></TT | |
| 841 > member and filling the appropriate member structure with information. | |
| 842 <PRE | |
| 843 CLASS="PROGRAMLISTING" | |
| 844 >SDL_Event user_event; | |
| 845 | |
| 846 user_event.type=SDL_USEREVENT; | |
| 847 user_event.user.code=2; | |
| 848 user_event.user.data1=NULL; | |
| 849 user_event.user.data2=NULL; | |
| 850 SDL_PushEvent(&user_event);</PRE | |
| 851 ></P | |
| 852 ></DIV | |
| 853 ><DIV | |
| 854 CLASS="REFSECT1" | |
| 855 ><A | |
|
55
55f1f1b3e27d
Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
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|
856 NAME="AEN3509" |
| 0 | 857 ></A |
| 858 ><H2 | |
| 859 >See Also</H2 | |
| 860 ><P | |
| 861 ><A | |
| 862 HREF="sdlpollevent.html" | |
| 863 ><TT | |
| 864 CLASS="FUNCTION" | |
| 865 >SDL_PollEvent</TT | |
| 866 ></A | |
| 867 >, | |
| 868 <A | |
| 869 HREF="sdlpushevent.html" | |
| 870 ><TT | |
| 871 CLASS="FUNCTION" | |
| 872 >SDL_PushEvent</TT | |
| 873 ></A | |
| 874 >, | |
| 875 <A | |
| 876 HREF="sdlpeepevents.html" | |
| 877 ><TT | |
| 878 CLASS="FUNCTION" | |
| 879 >SDL_PeepEvents</TT | |
| 880 ></A | |
| 881 ></P | |
| 882 ></DIV | |
| 883 ><DIV | |
| 884 CLASS="NAVFOOTER" | |
| 885 ><HR | |
| 886 ALIGN="LEFT" | |
| 887 WIDTH="100%"><TABLE | |
| 888 WIDTH="100%" | |
| 889 BORDER="0" | |
| 890 CELLPADDING="0" | |
| 891 CELLSPACING="0" | |
| 892 ><TR | |
| 893 ><TD | |
| 894 WIDTH="33%" | |
| 895 ALIGN="left" | |
| 896 VALIGN="top" | |
| 897 ><A | |
| 898 HREF="eventstructures.html" | |
| 899 >Prev</A | |
| 900 ></TD | |
| 901 ><TD | |
| 902 WIDTH="34%" | |
| 903 ALIGN="center" | |
| 904 VALIGN="top" | |
| 905 ><A | |
| 906 HREF="index.html" | |
| 907 >Home</A | |
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| 910 WIDTH="33%" | |
| 911 ALIGN="right" | |
| 912 VALIGN="top" | |
| 913 ><A | |
| 914 HREF="sdlactiveevent.html" | |
| 915 >Next</A | |
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| 918 ><TR | |
| 919 ><TD | |
| 920 WIDTH="33%" | |
| 921 ALIGN="left" | |
| 922 VALIGN="top" | |
| 923 >SDL Event Structures.</TD | |
| 924 ><TD | |
| 925 WIDTH="34%" | |
| 926 ALIGN="center" | |
| 927 VALIGN="top" | |
| 928 ><A | |
| 929 HREF="eventstructures.html" | |
| 930 >Up</A | |
| 931 ></TD | |
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| 933 WIDTH="33%" | |
| 934 ALIGN="right" | |
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| 936 >SDL_ActiveEvent</TD | |
| 937 ></TR | |
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| 942 > |