Mercurial > sdl-ios-xcode
annotate src/events/SDL_events.c @ 615:7ec821f3cbd0
Date: Thu, 17 Apr 2003 23:27:34 -0400
From: Darrell Walisser
Subject: Yet another OS X cursor bug
The synopsis:
1. Call SDL_ShowCursor(0);
2. Call SDL_SetVideoMode();
3. Call SDL_GetEvent();
3. Call SDL_ShowCursor(1);
The result: Sometimes the cursor doesn't come back! Ack! Oddly enough,
it does come back when mousing over the dock or clicking in the menu
bar. But that's besides the point.
The reason why this is happening is a flaw in the handling of
activation/deactivation events. The short explanation is that the
HideCursor() and ShowCursor() calls must be balanced, but if the cursor
was initially hidden, HideCursor() was called again on the activate
event - so now the next ShowCursor() fails (as does the next, and the
next, for some reason).
So, here's the patch. All it does is keep track of the
HideCursor()/ShowCursor() calls so that they will always be balanced.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 20 Apr 2003 05:41:16 +0000 |
| parents | 1870bb49ab18 |
| children | b8d311d90021 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
297
f6ffac90895c
Updated copyright information for 2002
Sam Lantinga <slouken@libsdl.org>
parents:
276
diff
changeset
|
3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
252
e8157fcb3114
Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
parents:
0
diff
changeset
|
20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* General event handling code for SDL */ | |
| 29 | |
| 30 #include <stdio.h> | |
| 31 #include <string.h> | |
| 32 | |
| 33 #include "SDL.h" | |
| 34 #include "SDL_thread.h" | |
| 35 #include "SDL_mutex.h" | |
| 36 #include "SDL_events.h" | |
| 37 #include "SDL_events_c.h" | |
| 38 #include "SDL_timer_c.h" | |
| 39 #ifndef DISABLE_JOYSTICK | |
| 40 #include "SDL_joystick_c.h" | |
| 41 #endif | |
| 42 #ifndef ENABLE_X11 | |
| 43 #define DISABLE_X11 | |
| 44 #endif | |
| 45 #include "SDL_syswm.h" | |
| 46 #include "SDL_sysevents.h" | |
| 47 | |
| 48 /* Public data -- the event filter */ | |
| 49 SDL_EventFilter SDL_EventOK = NULL; | |
| 50 Uint8 SDL_ProcessEvents[SDL_NUMEVENTS]; | |
| 51 static Uint32 SDL_eventstate = 0; | |
| 52 | |
| 53 /* Private data -- event queue */ | |
| 54 #define MAXEVENTS 128 | |
| 55 static struct { | |
| 56 SDL_mutex *lock; | |
| 57 int active; | |
| 58 int head; | |
| 59 int tail; | |
| 60 SDL_Event event[MAXEVENTS]; | |
| 61 int wmmsg_next; | |
| 62 struct SDL_SysWMmsg wmmsg[MAXEVENTS]; | |
| 63 } SDL_EventQ; | |
| 64 | |
| 65 /* Private data -- event locking structure */ | |
| 66 static struct { | |
| 67 SDL_mutex *lock; | |
| 68 int safe; | |
| 69 } SDL_EventLock; | |
| 70 | |
| 71 /* Thread functions */ | |
| 72 static SDL_Thread *SDL_EventThread = NULL; /* Thread handle */ | |
| 73 static Uint32 event_thread; /* The event thread id */ | |
| 74 | |
| 75 void SDL_Lock_EventThread(void) | |
| 76 { | |
| 77 if ( SDL_EventThread && (SDL_ThreadID() != event_thread) ) { | |
| 78 /* Grab lock and spin until we're sure event thread stopped */ | |
| 79 SDL_mutexP(SDL_EventLock.lock); | |
| 80 while ( ! SDL_EventLock.safe ) { | |
| 81 SDL_Delay(1); | |
| 82 } | |
| 83 } | |
| 84 } | |
| 85 void SDL_Unlock_EventThread(void) | |
| 86 { | |
| 87 if ( SDL_EventThread && (SDL_ThreadID() != event_thread) ) { | |
| 88 SDL_mutexV(SDL_EventLock.lock); | |
| 89 } | |
| 90 } | |
| 91 | |
| 92 static int SDL_GobbleEvents(void *unused) | |
| 93 { | |
| 94 SDL_SetTimerThreaded(2); | |
| 95 event_thread = SDL_ThreadID(); | |
| 96 while ( SDL_EventQ.active ) { | |
| 97 SDL_VideoDevice *video = current_video; | |
| 98 SDL_VideoDevice *this = current_video; | |
| 99 | |
| 100 /* Get events from the video subsystem */ | |
| 101 if ( video ) { | |
| 102 video->PumpEvents(this); | |
| 103 } | |
| 104 | |
| 105 /* Queue pending key-repeat events */ | |
| 106 SDL_CheckKeyRepeat(); | |
| 107 | |
| 108 #ifndef DISABLE_JOYSTICK | |
| 109 /* Check for joystick state change */ | |
| 110 if ( SDL_numjoysticks && (SDL_eventstate & SDL_JOYEVENTMASK) ) { | |
| 111 SDL_JoystickUpdate(); | |
| 112 } | |
| 113 #endif | |
| 114 | |
| 115 /* Give up the CPU for the rest of our timeslice */ | |
| 116 SDL_EventLock.safe = 1; | |
| 117 if( SDL_timer_running ) { | |
| 118 SDL_ThreadedTimerCheck(); | |
| 119 } | |
| 120 SDL_Delay(1); | |
| 121 | |
| 122 /* Check for event locking. | |
| 123 On the P of the lock mutex, if the lock is held, this thread | |
| 124 will wait until the lock is released before continuing. The | |
| 125 safe flag will be set, meaning that the other thread can go | |
| 126 about it's business. The safe flag is reset before the V, | |
| 127 so as soon as the mutex is free, other threads can see that | |
| 128 it's not safe to interfere with the event thread. | |
| 129 */ | |
| 130 SDL_mutexP(SDL_EventLock.lock); | |
| 131 SDL_EventLock.safe = 0; | |
| 132 SDL_mutexV(SDL_EventLock.lock); | |
| 133 } | |
| 134 SDL_SetTimerThreaded(0); | |
| 135 event_thread = 0; | |
| 136 return(0); | |
| 137 } | |
| 138 | |
| 139 static int SDL_StartEventThread(Uint32 flags) | |
| 140 { | |
| 141 /* Reset everything to zero */ | |
| 142 SDL_EventThread = NULL; | |
| 143 memset(&SDL_EventLock, 0, sizeof(SDL_EventLock)); | |
| 144 | |
| 145 /* Create the lock and set ourselves active */ | |
| 146 #ifndef DISABLE_THREADS | |
| 147 SDL_EventQ.lock = SDL_CreateMutex(); | |
| 148 if ( SDL_EventQ.lock == NULL ) { | |
| 149 #ifdef macintosh /* On MacOS 7/8, you can't multithread, so no lock needed */ | |
| 150 ; | |
| 151 #else | |
| 152 return(-1); | |
| 153 #endif | |
| 154 } | |
| 155 #endif /* !DISABLE_THREADS */ | |
| 156 SDL_EventQ.active = 1; | |
| 157 | |
| 158 if ( (flags&SDL_INIT_EVENTTHREAD) == SDL_INIT_EVENTTHREAD ) { | |
| 159 SDL_EventLock.lock = SDL_CreateMutex(); | |
| 160 if ( SDL_EventLock.lock == NULL ) { | |
| 161 return(-1); | |
| 162 } | |
| 163 SDL_EventLock.safe = 0; | |
| 164 | |
| 165 SDL_EventThread = SDL_CreateThread(SDL_GobbleEvents, NULL); | |
| 166 if ( SDL_EventThread == NULL ) { | |
| 167 return(-1); | |
| 168 } | |
| 169 } else { | |
| 170 event_thread = 0; | |
| 171 } | |
| 172 return(0); | |
| 173 } | |
| 174 | |
| 175 static void SDL_StopEventThread(void) | |
| 176 { | |
| 177 SDL_EventQ.active = 0; | |
| 178 if ( SDL_EventThread ) { | |
| 179 SDL_WaitThread(SDL_EventThread, NULL); | |
| 180 SDL_EventThread = NULL; | |
| 181 SDL_DestroyMutex(SDL_EventLock.lock); | |
| 182 } | |
| 183 SDL_DestroyMutex(SDL_EventQ.lock); | |
| 184 } | |
| 185 | |
| 186 Uint32 SDL_EventThreadID(void) | |
| 187 { | |
| 188 return(event_thread); | |
| 189 } | |
| 190 | |
| 191 /* Public functions */ | |
| 192 | |
| 193 void SDL_StopEventLoop(void) | |
| 194 { | |
| 195 /* Halt the event thread, if running */ | |
| 196 SDL_StopEventThread(); | |
| 197 | |
| 198 /* Clean out EventQ */ | |
| 199 SDL_EventQ.head = 0; | |
| 200 SDL_EventQ.tail = 0; | |
| 201 SDL_EventQ.wmmsg_next = 0; | |
| 202 } | |
| 203 | |
| 204 /* This function (and associated calls) may be called more than once */ | |
| 205 int SDL_StartEventLoop(Uint32 flags) | |
| 206 { | |
| 207 int retcode; | |
| 208 | |
| 209 /* Clean out the event queue */ | |
| 210 SDL_EventThread = NULL; | |
| 211 SDL_EventQ.lock = NULL; | |
| 212 SDL_StopEventLoop(); | |
| 213 | |
| 214 /* No filter to start with, process most event types */ | |
| 215 SDL_EventOK = NULL; | |
| 216 memset(SDL_ProcessEvents,SDL_ENABLE,sizeof(SDL_ProcessEvents)); | |
| 217 SDL_eventstate = ~0; | |
| 218 /* It's not save to call SDL_EventState() yet */ | |
| 219 SDL_eventstate &= ~(0x00000001 << SDL_SYSWMEVENT); | |
| 220 SDL_ProcessEvents[SDL_SYSWMEVENT] = SDL_IGNORE; | |
| 221 | |
| 222 /* Initialize event handlers */ | |
| 223 retcode = 0; | |
| 224 retcode += SDL_AppActiveInit(); | |
| 225 retcode += SDL_KeyboardInit(); | |
| 226 retcode += SDL_MouseInit(); | |
| 227 retcode += SDL_QuitInit(); | |
| 228 if ( retcode < 0 ) { | |
| 229 /* We don't expect them to fail, but... */ | |
| 230 return(-1); | |
| 231 } | |
| 232 | |
| 233 /* Create the lock and event thread */ | |
| 234 if ( SDL_StartEventThread(flags) < 0 ) { | |
| 235 SDL_StopEventLoop(); | |
| 236 return(-1); | |
| 237 } | |
| 238 return(0); | |
| 239 } | |
| 240 | |
| 241 | |
| 242 /* Add an event to the event queue -- called with the queue locked */ | |
| 243 static int SDL_AddEvent(SDL_Event *event) | |
| 244 { | |
| 245 int tail, added; | |
| 246 | |
| 247 tail = (SDL_EventQ.tail+1)%MAXEVENTS; | |
| 248 if ( tail == SDL_EventQ.head ) { | |
| 249 /* Overflow, drop event */ | |
| 250 added = 0; | |
| 251 } else { | |
| 252 SDL_EventQ.event[SDL_EventQ.tail] = *event; | |
| 253 if (event->type == SDL_SYSWMEVENT) { | |
| 254 /* Note that it's possible to lose an event */ | |
| 255 int next = SDL_EventQ.wmmsg_next; | |
| 256 SDL_EventQ.wmmsg[next] = *event->syswm.msg; | |
| 257 SDL_EventQ.event[SDL_EventQ.tail].syswm.msg = | |
| 258 &SDL_EventQ.wmmsg[next]; | |
| 259 SDL_EventQ.wmmsg_next = (next+1)%MAXEVENTS; | |
| 260 } | |
| 261 SDL_EventQ.tail = tail; | |
| 262 added = 1; | |
| 263 } | |
| 264 return(added); | |
| 265 } | |
| 266 | |
| 267 /* Cut an event, and return the next valid spot, or the tail */ | |
| 268 /* -- called with the queue locked */ | |
| 269 static int SDL_CutEvent(int spot) | |
| 270 { | |
| 271 if ( spot == SDL_EventQ.head ) { | |
| 272 SDL_EventQ.head = (SDL_EventQ.head+1)%MAXEVENTS; | |
| 273 return(SDL_EventQ.head); | |
| 274 } else | |
| 275 if ( (spot+1)%MAXEVENTS == SDL_EventQ.tail ) { | |
| 276 SDL_EventQ.tail = spot; | |
| 277 return(SDL_EventQ.tail); | |
| 278 } else | |
| 279 /* We cut the middle -- shift everything over */ | |
| 280 { | |
| 281 int here, next; | |
| 282 | |
| 283 /* This can probably be optimized with memcpy() -- careful! */ | |
| 284 if ( --SDL_EventQ.tail < 0 ) { | |
| 285 SDL_EventQ.tail = MAXEVENTS-1; | |
| 286 } | |
| 287 for ( here=spot; here != SDL_EventQ.tail; here = next ) { | |
| 288 next = (here+1)%MAXEVENTS; | |
| 289 SDL_EventQ.event[here] = SDL_EventQ.event[next]; | |
| 290 } | |
| 291 return(spot); | |
| 292 } | |
| 293 /* NOTREACHED */ | |
| 294 } | |
| 295 | |
| 296 /* Lock the event queue, take a peep at it, and unlock it */ | |
| 297 int SDL_PeepEvents(SDL_Event *events, int numevents, SDL_eventaction action, | |
| 298 Uint32 mask) | |
| 299 { | |
| 300 int i, used; | |
| 301 | |
| 302 /* Don't look after we've quit */ | |
| 303 if ( ! SDL_EventQ.active ) { | |
|
276
8af85680ca0a
Updated the documentation for the SDL_PushEvent() call.
Sam Lantinga <slouken@libsdl.org>
parents:
252
diff
changeset
|
304 return(-1); |
| 0 | 305 } |
| 306 /* Lock the event queue */ | |
| 307 used = 0; | |
| 308 if ( SDL_mutexP(SDL_EventQ.lock) == 0 ) { | |
| 309 if ( action == SDL_ADDEVENT ) { | |
| 310 for ( i=0; i<numevents; ++i ) { | |
| 311 used += SDL_AddEvent(&events[i]); | |
| 312 } | |
| 313 } else { | |
| 314 SDL_Event tmpevent; | |
| 315 int spot; | |
| 316 | |
| 317 /* If 'events' is NULL, just see if they exist */ | |
| 318 if ( events == NULL ) { | |
| 319 action = SDL_PEEKEVENT; | |
| 320 numevents = 1; | |
| 321 events = &tmpevent; | |
| 322 } | |
| 323 spot = SDL_EventQ.head; | |
| 324 while ((used < numevents)&&(spot != SDL_EventQ.tail)) { | |
| 325 if ( mask & SDL_EVENTMASK(SDL_EventQ.event[spot].type) ) { | |
| 326 events[used++] = SDL_EventQ.event[spot]; | |
| 327 if ( action == SDL_GETEVENT ) { | |
| 328 spot = SDL_CutEvent(spot); | |
| 329 } else { | |
| 330 spot = (spot+1)%MAXEVENTS; | |
| 331 } | |
| 332 } else { | |
| 333 spot = (spot+1)%MAXEVENTS; | |
| 334 } | |
| 335 } | |
| 336 } | |
| 337 SDL_mutexV(SDL_EventQ.lock); | |
| 338 } else { | |
| 339 SDL_SetError("Couldn't lock event queue"); | |
| 340 used = -1; | |
| 341 } | |
| 342 return(used); | |
| 343 } | |
| 344 | |
| 345 /* Run the system dependent event loops */ | |
| 346 void SDL_PumpEvents(void) | |
| 347 { | |
| 348 if ( !SDL_EventThread ) { | |
| 349 SDL_VideoDevice *video = current_video; | |
| 350 SDL_VideoDevice *this = current_video; | |
| 351 | |
| 352 /* Get events from the video subsystem */ | |
| 353 if ( video ) { | |
| 354 video->PumpEvents(this); | |
| 355 } | |
| 356 | |
| 357 /* Queue pending key-repeat events */ | |
| 358 SDL_CheckKeyRepeat(); | |
| 359 | |
| 360 #ifndef DISABLE_JOYSTICK | |
| 361 /* Check for joystick state change */ | |
| 362 if ( SDL_numjoysticks && (SDL_eventstate & SDL_JOYEVENTMASK) ) { | |
| 363 SDL_JoystickUpdate(); | |
| 364 } | |
| 365 #endif | |
| 366 } | |
| 367 } | |
| 368 | |
| 369 /* Public functions */ | |
| 370 | |
| 371 int SDL_PollEvent (SDL_Event *event) | |
| 372 { | |
| 373 SDL_PumpEvents(); | |
| 374 | |
|
352
b49fc922e7f6
Fixed SDL_PollEvent() so it only returns a boolean value (not -1)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
375 /* We can't return -1, just return 0 (no event) on error */ |
|
b49fc922e7f6
Fixed SDL_PollEvent() so it only returns a boolean value (not -1)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
376 if ( SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_ALLEVENTS) <= 0 ) |
|
b49fc922e7f6
Fixed SDL_PollEvent() so it only returns a boolean value (not -1)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
377 return 0; |
|
b49fc922e7f6
Fixed SDL_PollEvent() so it only returns a boolean value (not -1)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
378 return 1; |
| 0 | 379 } |
| 380 | |
| 381 int SDL_WaitEvent (SDL_Event *event) | |
| 382 { | |
| 383 while ( 1 ) { | |
| 384 SDL_PumpEvents(); | |
| 385 switch(SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_ALLEVENTS)) { | |
|
353
d47637068e52
The documented error return value for SDL_WaitEvent() is 0.
Sam Lantinga <slouken@libsdl.org>
parents:
352
diff
changeset
|
386 case -1: return 0; |
| 0 | 387 case 1: return 1; |
| 388 case 0: SDL_Delay(10); | |
| 389 } | |
| 390 } | |
| 391 } | |
| 392 | |
| 393 int SDL_PushEvent(SDL_Event *event) | |
| 394 { | |
| 384 | 395 if ( SDL_PeepEvents(event, 1, SDL_ADDEVENT, 0) <= 0 ) |
| 396 return -1; | |
| 397 return 0; | |
| 0 | 398 } |
| 399 | |
| 400 void SDL_SetEventFilter (SDL_EventFilter filter) | |
| 401 { | |
| 402 SDL_Event bitbucket; | |
| 403 | |
| 404 /* Set filter and discard pending events */ | |
| 405 SDL_EventOK = filter; | |
| 406 while ( SDL_PollEvent(&bitbucket) > 0 ) | |
| 407 ; | |
| 408 } | |
| 409 | |
| 410 SDL_EventFilter SDL_GetEventFilter(void) | |
| 411 { | |
| 412 return(SDL_EventOK); | |
| 413 } | |
| 414 | |
| 415 Uint8 SDL_EventState (Uint8 type, int state) | |
| 416 { | |
| 417 SDL_Event bitbucket; | |
| 418 Uint8 current_state; | |
| 419 | |
| 420 /* If SDL_ALLEVENTS was specified... */ | |
| 421 if ( type == 0xFF ) { | |
| 422 current_state = SDL_IGNORE; | |
| 423 for ( type=0; type<SDL_NUMEVENTS; ++type ) { | |
| 424 if ( SDL_ProcessEvents[type] != SDL_IGNORE ) { | |
| 425 current_state = SDL_ENABLE; | |
| 426 } | |
| 427 SDL_ProcessEvents[type] = state; | |
| 428 if ( state == SDL_ENABLE ) { | |
| 429 SDL_eventstate |= (0x00000001 << (type)); | |
| 430 } else { | |
| 431 SDL_eventstate &= ~(0x00000001 << (type)); | |
| 432 } | |
| 433 } | |
| 434 while ( SDL_PollEvent(&bitbucket) > 0 ) | |
| 435 ; | |
| 436 return(current_state); | |
| 437 } | |
| 438 | |
| 439 /* Just set the state for one event type */ | |
| 440 current_state = SDL_ProcessEvents[type]; | |
| 441 switch (state) { | |
| 442 case SDL_IGNORE: | |
| 443 case SDL_ENABLE: | |
| 444 /* Set state and discard pending events */ | |
| 445 SDL_ProcessEvents[type] = state; | |
| 446 if ( state == SDL_ENABLE ) { | |
| 447 SDL_eventstate |= (0x00000001 << (type)); | |
| 448 } else { | |
| 449 SDL_eventstate &= ~(0x00000001 << (type)); | |
| 450 } | |
| 451 while ( SDL_PollEvent(&bitbucket) > 0 ) | |
| 452 ; | |
| 453 break; | |
| 454 default: | |
| 455 /* Querying state? */ | |
| 456 break; | |
| 457 } | |
| 458 return(current_state); | |
| 459 } | |
| 460 | |
| 461 /* This is a generic event handler. | |
| 462 */ | |
| 463 int SDL_PrivateSysWMEvent(SDL_SysWMmsg *message) | |
| 464 { | |
| 465 int posted; | |
| 466 | |
| 467 posted = 0; | |
| 468 if ( SDL_ProcessEvents[SDL_SYSWMEVENT] == SDL_ENABLE ) { | |
| 469 SDL_Event event; | |
| 470 memset(&event, 0, sizeof(event)); | |
| 471 event.type = SDL_SYSWMEVENT; | |
| 472 event.syswm.msg = message; | |
| 473 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 474 posted = 1; | |
| 475 SDL_PushEvent(&event); | |
| 476 } | |
| 477 } | |
| 478 /* Update internal event state */ | |
| 479 return(posted); | |
| 480 } |