WINGs/wevent.c

   1
   2
   3 /*
   4  * This event handling stuff was inspired on Tk.
   5  */
   6
   7 #include "WINGsP.h"
   8
   9 #include "../src/config.h"
  10
  11 #include <sys/types.h>
  12 #include <unistd.h>
  13
  14 #ifdef HAVE_POLL_H
  15 #include <poll.h>
  16 #endif
  17
  18
  19 #include <X11/Xos.h>
  20
  21 #ifdef HAVE_SYS_SELECT_H
  22 # include <sys/select.h>
  23 #endif
  24
  25 #include <time.h>
  26
  27 #ifndef X_GETTIMEOFDAY
  28 #define X_GETTIMEOFDAY(t) gettimeofday(t, (struct timezone*)0)
  29 #endif
  30
  31
  32
  33
  34
  35
  36 typedef struct TimerHandler {
  37     WMCallback          *callback;             /* procedure to call */
  38     struct timeval      when;                  /* when to call the callback */
  39     void                *clientData;
  40     struct TimerHandler *next;
  41 } TimerHandler;
  42
  43
  44 typedef struct IdleHandler {
  45     WMCallback          *callback;
  46     void                *clientData;
  47 } IdleHandler;
  48
  49
  50 typedef struct InputHandler {
  51     WMInputProc         *callback;
  52     void                *clientData;
  53     int                 fd;
  54     int                 mask;
  55 } InputHandler;
  56
  57
  58 /* table to map event types to event masks */
  59 static unsigned long eventMasks[] = {
  60     0,
  61     0,
  62     KeyPressMask,                       /* KeyPress */
  63     KeyReleaseMask,                     /* KeyRelease */
  64     ButtonPressMask,                    /* ButtonPress */
  65     ButtonReleaseMask,                  /* ButtonRelease */
  66     PointerMotionMask|PointerMotionHintMask|ButtonMotionMask
  67             |Button1MotionMask|Button2MotionMask|Button3MotionMask
  68             |Button4MotionMask|Button5MotionMask,
  69                                         /* MotionNotify */
  70     EnterWindowMask,                    /* EnterNotify */
  71     LeaveWindowMask,                    /* LeaveNotify */
  72     FocusChangeMask,                    /* FocusIn */
  73     FocusChangeMask,                    /* FocusOut */
  74     KeymapStateMask,                    /* KeymapNotify */
  75     ExposureMask,                       /* Expose */
  76     ExposureMask,                       /* GraphicsExpose */
  77     ExposureMask,                       /* NoExpose */
  78     VisibilityChangeMask,               /* VisibilityNotify */
  79     SubstructureNotifyMask,             /* CreateNotify */
  80     StructureNotifyMask,                /* DestroyNotify */
  81     StructureNotifyMask,                /* UnmapNotify */
  82     StructureNotifyMask,                /* MapNotify */
  83     SubstructureRedirectMask,           /* MapRequest */
  84     StructureNotifyMask,                /* ReparentNotify */
  85     StructureNotifyMask,                /* ConfigureNotify */
  86     SubstructureRedirectMask,           /* ConfigureRequest */
  87     StructureNotifyMask,                /* GravityNotify */
  88     ResizeRedirectMask,                 /* ResizeRequest */
  89     StructureNotifyMask,                /* CirculateNotify */
  90     SubstructureRedirectMask,           /* CirculateRequest */
  91     PropertyChangeMask,                 /* PropertyNotify */
  92     0,                                  /* SelectionClear */
  93     0,                                  /* SelectionRequest */
  94     0,                                  /* SelectionNotify */
  95     ColormapChangeMask,                 /* ColormapNotify */
  96     ClientMessageMask,                  /* ClientMessage */
  97     0,                                  /* Mapping Notify */
  98 };
  99
 100
 101
 102 /* queue of timer event handlers */
 103 static TimerHandler *timerHandler=NULL;
 104
 105 static WMBag *idleHandler=NULL;
 106
 107 static WMBag *inputHandler=NULL;
 108
 109 /* hook for other toolkits or wmaker process their events */
 110 static WMEventHook *extraEventHandler=NULL;
 111
 112
 113
 114 #define timerPending()  (timerHandler)
 115
 116
 117
 118 static void
 119 rightNow(struct timeval *tv) {
 120     X_GETTIMEOFDAY(tv);
 121 }
 122
 123 /* is t1 after t2 ? */
 124 #define IS_AFTER(t1, t2)        (((t1).tv_sec > (t2).tv_sec) || \
 125                                  (((t1).tv_sec == (t2).tv_sec) \
 126                                   && ((t1).tv_usec > (t2).tv_usec)))
 127
 128
 129 static void
 130 addmillisecs(struct timeval *tv, int milliseconds)
 131 {
 132     tv->tv_usec += milliseconds*1000;
 133
 134     tv->tv_sec += tv->tv_usec/1000000;
 135     tv->tv_usec = tv->tv_usec%1000000;
 136 }
 137
 138
 139 WMHandlerID
 140 WMAddTimerHandler(int milliseconds, WMCallback *callback, void *cdata)
 141 {
 142     TimerHandler *handler, *tmp;
 143
 144     handler = malloc(sizeof(TimerHandler));
 145     if (!handler)
 146       return NULL;
 147
 148     rightNow(&handler->when);
 149     addmillisecs(&handler->when, milliseconds);
 150     handler->callback = callback;
 151     handler->clientData = cdata;
 152     /* insert callback in queue, sorted by time left */
 153     if (!timerHandler || !IS_AFTER(handler->when, timerHandler->when)) {
 154         /* first in the queue */
 155         handler->next = timerHandler;
 156         timerHandler = handler;
 157     } else {
 158         tmp = timerHandler;
 159         while (tmp->next && IS_AFTER(handler->when, tmp->next->when)) {
 160             tmp = tmp->next;
 161         }
 162         handler->next = tmp->next;
 163         tmp->next = handler;
 164     }
 165     return handler;
 166 }
 167
 168
 169
 170 void
 171 WMDeleteTimerWithClientData(void *cdata)
 172 {
 173     TimerHandler *handler, *tmp;
 174
 175     if (!cdata || !timerHandler)
 176         return;
 177
 178     tmp = timerHandler;
 179     if (tmp->clientData==cdata) {
 180         timerHandler = tmp->next;
 181         wfree(tmp);
 182     } else {
 183         while (tmp->next) {
 184             if (tmp->next->clientData==cdata) {
 185                 handler = tmp->next;
 186                 tmp->next = handler->next;
 187                 wfree(handler);
 188                 break;
 189             }
 190             tmp = tmp->next;
 191         }
 192     }
 193 }
 194
 195
 196
 197 void
 198 WMDeleteTimerHandler(WMHandlerID handlerID)
 199 {
 200     TimerHandler *tmp, *handler=(TimerHandler*)handlerID;
 201
 202     if (!handler || !timerHandler)
 203       return;
 204
 205     tmp = timerHandler;
 206     if (tmp==handler) {
 207         timerHandler = handler->next;
 208         wfree(handler);
 209     } else {
 210         while (tmp->next) {
 211             if (tmp->next==handler) {
 212                 tmp->next=handler->next;
 213                 wfree(handler);
 214                 break;
 215             }
 216             tmp = tmp->next;
 217         }
 218     }
 219 }
 220
 221
 222
 223 WMHandlerID
 224 WMAddIdleHandler(WMCallback *callback, void *cdata)
 225 {
 226     IdleHandler *handler;
 227
 228     handler = malloc(sizeof(IdleHandler));
 229     if (!handler)
 230         return NULL;
 231
 232     handler->callback = callback;
 233     handler->clientData = cdata;
 234     /* add handler at end of queue */
 235     if (!idleHandler) {
 236         idleHandler = WMCreateBag(16);
 237     }
 238     WMPutInBag(idleHandler, handler);
 239
 240     return handler;
 241 }
 242
 243
 244
 245 void
 246 WMDeleteIdleHandler(WMHandlerID handlerID)
 247 {
 248     IdleHandler *handler = (IdleHandler*)handlerID;
 249     int pos;
 250
 251     if (!handler || !idleHandler)
 252         return;
 253
 254     pos = WMGetFirstInBag(idleHandler, handler);
 255     if (pos != WBNotFound) {
 256         wfree(handler);
 257         WMDeleteFromBag(idleHandler, pos);
 258     }
 259 }
 260
 261
 262
 263 WMHandlerID
 264 WMAddInputHandler(int fd, int condition, WMInputProc *proc, void *clientData)
 265 {
 266     InputHandler *handler;
 267
 268     handler = wmalloc(sizeof(InputHandler));
 269
 270     handler->fd = fd;
 271     handler->mask = condition;
 272     handler->callback = proc;
 273     handler->clientData = clientData;
 274
 275     if (!inputHandler)
 276         inputHandler = WMCreateBag(16);
 277     WMPutInBag(inputHandler, handler);
 278
 279     return handler;
 280 }
 281
 282
 283
 284 void
 285 WMDeleteInputHandler(WMHandlerID handlerID)
 286 {
 287     InputHandler *handler = (InputHandler*)handlerID;
 288     int pos;
 289
 290     if (!handler || !inputHandler)
 291         return;
 292
 293     pos = WMGetFirstInBag(inputHandler, handler);
 294     if (pos != WBNotFound) {
 295         wfree(handler);
 296         WMDeleteFromBag(inputHandler, pos);
 297     }
 298 }
 299
 300
 301
 302 static Bool
 303 checkIdleHandlers()
 304 {
 305     IdleHandler *handler;
 306     WMBag *handlerCopy;
 307     WMBagIterator iter;
 308
 309     if (!idleHandler || WMGetBagItemCount(idleHandler)==0) {
 310         W_FlushIdleNotificationQueue();
 311         /* make sure an observer in queue didn't added an idle handler */
 312         return (idleHandler!=NULL && WMGetBagItemCount(idleHandler)>0);
 313     }
 314
 315     handlerCopy = WMCreateBag(WMGetBagItemCount(idleHandler));
 316     WMAppendBag(handlerCopy, idleHandler);
 317
 318     for (handler = WMBagFirst(handlerCopy, &iter);
 319          iter != NULL;
 320          handler = WMBagNext(handlerCopy, &iter)) {
 321         /* check if the handler still exist or was removed by a callback */
 322         if (WMGetFirstInBag(idleHandler, handler) == WBNotFound)
 323             continue;
 324
 325         (*handler->callback)(handler->clientData);
 326         WMDeleteIdleHandler(handler);
 327     }
 328
 329     WMFreeBag(handlerCopy);
 330
 331     W_FlushIdleNotificationQueue();
 332
 333     /* this is not necesarrily False, because one handler can re-add itself */
 334     return (WMGetBagItemCount(idleHandler)>0);
 335 }
 336
 337
 338
 339 static void
 340 checkTimerHandlers()
 341 {
 342     TimerHandler *handler;
 343     struct timeval now;
 344
 345     if (!timerHandler) {
 346         W_FlushASAPNotificationQueue();
 347         return;
 348     }
 349
 350     rightNow(&now);
 351
 352     while (timerHandler && IS_AFTER(now, timerHandler->when)) {
 353         handler = timerHandler;
 354         timerHandler = timerHandler->next;
 355         handler->next = NULL;
 356         (*handler->callback)(handler->clientData);
 357         wfree(handler);
 358     }
 359
 360     W_FlushASAPNotificationQueue();
 361 }
 362
 363
 364
 365 static void
 366 delayUntilNextTimerEvent(struct timeval *delay)
 367 {
 368     struct timeval now;
 369
 370     if (!timerHandler) {
 371         /* The return value of this function is only valid if there _are_
 372          timers active. */
 373         delay->tv_sec = 0;
 374         delay->tv_usec = 0;
 375         return;
 376     }
 377
 378     rightNow(&now);
 379     if (IS_AFTER(now, timerHandler->when)) {
 380         delay->tv_sec = 0;
 381         delay->tv_usec = 0;
 382     } else {
 383         delay->tv_sec = timerHandler->when.tv_sec - now.tv_sec;
 384         delay->tv_usec = timerHandler->when.tv_usec - now.tv_usec;
 385         if (delay->tv_usec < 0) {
 386             delay->tv_usec += 1000000;
 387             delay->tv_sec--;
 388         }
 389     }
 390 }
 391
 392
 393
 394
 395 /*
 396  * WMCreateEventHandler--
 397  *      Create an event handler and put it in the event handler list for the
 398  * view. If the same callback and clientdata are already used in another
 399  * handler, the masks are swapped.
 400  *
 401  */
 402 void
 403 WMCreateEventHandler(WMView *view, unsigned long mask, WMEventProc *eventProc,
 404                      void *clientData)
 405 {
 406     W_EventHandler *handler, *ptr;
 407     unsigned long eventMask;
 408     WMBagIterator iter;
 409
 410
 411     handler = NULL;
 412     eventMask = mask;
 413
 414     WM_ITERATE_BAG(view->eventHandlers, ptr, iter) {
 415         if (ptr->clientData == clientData && ptr->proc == eventProc) {
 416             handler = ptr;
 417             eventMask |= ptr->eventMask;
 418         }
 419     }
 420     if (!handler) {
 421         handler = wmalloc(sizeof(W_EventHandler));
 422
 423         WMPutInBag(view->eventHandlers, handler);
 424     }
 425     /* select events for window */
 426     handler->eventMask = eventMask;
 427     handler->proc = eventProc;
 428     handler->clientData = clientData;
 429 }
 430
 431
 432 /*
 433  * WMDeleteEventHandler--
 434  *      Delete event handler matching arguments from windows
 435  * event handler list.
 436  *
 437  */
 438 void
 439 WMDeleteEventHandler(WMView *view, unsigned long mask, WMEventProc *eventProc,
 440                      void *clientData)
 441 {
 442     W_EventHandler *handler, *ptr;
 443     WMBagIterator iter;
 444
 445     handler = NULL;
 446
 447     WM_ITERATE_BAG(view->eventHandlers, ptr, iter) {
 448         if (ptr->eventMask == mask && ptr->proc == eventProc
 449             && ptr->clientData == clientData) {
 450             handler = ptr;
 451             break;
 452         }
 453     }
 454
 455     if (!handler)
 456         return;
 457
 458     WMRemoveFromBag(view->eventHandlers, handler);
 459
 460     wfree(handler);
 461 }
 462
 463
 464
 465 void
 466 W_CleanUpEvents(WMView *view)
 467 {
 468     W_EventHandler *ptr;
 469     WMBagIterator iter;
 470
 471     WM_ITERATE_BAG(view->eventHandlers, ptr, iter) {
 472         wfree(ptr);
 473     }
 474 }
 475
 476
 477
 478 static Time
 479 getEventTime(WMScreen *screen, XEvent *event)
 480 {
 481     switch (event->type) {
 482      case ButtonPress:
 483      case ButtonRelease:
 484         return event->xbutton.time;
 485      case KeyPress:
 486      case KeyRelease:
 487         return event->xkey.time;
 488      case MotionNotify:
 489         return event->xmotion.time;
 490      case EnterNotify:
 491      case LeaveNotify:
 492         return event->xcrossing.time;
 493      case PropertyNotify:
 494         return event->xproperty.time;
 495      case SelectionClear:
 496         return event->xselectionclear.time;
 497      case SelectionRequest:
 498         return event->xselectionrequest.time;
 499      case SelectionNotify:
 500         return event->xselection.time;
 501      default:
 502         return screen->lastEventTime;
 503     }
 504 }
 505
 506
 507 void
 508 W_CallDestroyHandlers(W_View *view)
 509 {
 510     XEvent event;
 511     WMBagIterator iter;
 512     W_EventHandler *hPtr;
 513
 514     event.type = DestroyNotify;
 515     event.xdestroywindow.window = view->window;
 516     event.xdestroywindow.event = view->window;
 517
 518     WM_ITERATE_BAG(view->eventHandlers, hPtr, iter) {
 519         if (hPtr->eventMask & StructureNotifyMask) {
 520             (*hPtr->proc)(&event, hPtr->clientData);
 521         }
 522     }
 523 }
 524
 525
 526 int
 527 WMHandleEvent(XEvent *event)
 528 {
 529     W_EventHandler *hPtr;
 530     W_View *view, *vPtr, *toplevel;
 531     unsigned long mask;
 532     Window window;
 533     WMBagIterator iter;
 534
 535     if (event->type == MappingNotify) {
 536         XRefreshKeyboardMapping(&event->xmapping);
 537         return True;
 538     }
 539
 540     mask = eventMasks[event->xany.type];
 541
 542     window = event->xany.window;
 543
 544     /* diferentiate SubstructureNotify with StructureNotify */
 545     if (mask == StructureNotifyMask) {
 546         if (event->xmap.event != event->xmap.window) {
 547             mask = SubstructureNotifyMask;
 548             window = event->xmap.event;
 549         }
 550     }
 551     view = W_GetViewForXWindow(event->xany.display, window);
 552
 553     if (!view) {
 554         if (extraEventHandler)
 555             (extraEventHandler)(event);
 556
 557         return False;
 558     }
 559
 560     view->screen->lastEventTime = getEventTime(view->screen, event);
 561
 562     toplevel = W_TopLevelOfView(view);
 563
 564     if (event->type == SelectionNotify || event->type == SelectionClear
 565         || event->type == SelectionRequest) {
 566         /* handle selection related events */
 567         W_HandleSelectionEvent(event);
 568
 569     } else if (event->type == ClientMessage) {
 570
 571         W_HandleDNDClientMessage(toplevel, &event->xclient);
 572     }
 573
 574     /* if it's a key event, redispatch it to the focused control */
 575     if (mask & (KeyPressMask|KeyReleaseMask)) {
 576         W_View *focused = W_FocusedViewOfToplevel(toplevel);
 577
 578         if (focused) {
 579             view = focused;
 580         }
 581     }
 582
 583     /* compress Motion events */
 584     if (event->type == MotionNotify && !view->flags.dontCompressMotion) {
 585         while (XPending(event->xmotion.display)) {
 586             XEvent ev;
 587             XPeekEvent(event->xmotion.display, &ev);
 588             if (ev.type == MotionNotify
 589                 && event->xmotion.window == ev.xmotion.window
 590                 && event->xmotion.subwindow == ev.xmotion.subwindow) {
 591                 /* replace events */
 592                 XNextEvent(event->xmotion.display, event);
 593             } else break;
 594         }
 595     }
 596
 597     /* compress expose events */
 598     if (event->type == Expose && !view->flags.dontCompressExpose) {
 599         while (XCheckTypedWindowEvent(event->xexpose.display, view->window,
 600                                       Expose, event));
 601     }
 602
 603
 604     if (view->screen->modal && toplevel!=view->screen->modalView
 605         && !toplevel->flags.worksWhenModal) {
 606         if (event->type == KeyPress || event->type == KeyRelease
 607             || event->type == MotionNotify || event->type == ButtonPress
 608             || event->type == ButtonRelease
 609             || event->type == FocusIn || event->type == FocusOut) {
 610             return True;
 611         }
 612     }
 613
 614     /* do balloon stuffs */
 615     if (event->type == EnterNotify)
 616         W_BalloonHandleEnterView(view);
 617     else if (event->type == LeaveNotify)
 618         W_BalloonHandleLeaveView(view);
 619
 620     /* This is a hack. It will make the panel be secure while
 621      * the event handlers are handled, as some event handler
 622      * might destroy the widget. */
 623     W_RetainView(toplevel);
 624
 625     WM_ITERATE_BAG(view->eventHandlers, hPtr, iter) {
 626         if ((hPtr->eventMask & mask)) {
 627             (*hPtr->proc)(event, hPtr->clientData);
 628         }
 629     }
 630
 631     /* pass the event to the top level window of the widget */
 632     /* TODO: change this to a responder chain */
 633     if (view->parent != NULL) {
 634         vPtr = view;
 635         while (vPtr->parent != NULL)
 636             vPtr = vPtr->parent;
 637
 638         WM_ITERATE_BAG(vPtr->eventHandlers, hPtr, iter) {
 639             if (hPtr->eventMask & mask) {
 640                 (*hPtr->proc)(event, hPtr->clientData);
 641             }
 642         }
 643     }
 644
 645     /* save button click info to track double-clicks */
 646     if (view->screen->ignoreNextDoubleClick) {
 647         view->screen->ignoreNextDoubleClick = 0;
 648     } else {
 649         if (event->type == ButtonPress) {
 650             view->screen->lastClickWindow = event->xbutton.window;
 651             view->screen->lastClickTime = event->xbutton.time;
 652         }
 653     }
 654
 655     W_ReleaseView(toplevel);
 656
 657     return True;
 658 }
 659
 660
 661 int
 662 WMIsDoubleClick(XEvent *event)
 663 {
 664     W_View *view;
 665
 666     if (event->type != ButtonPress)
 667         return False;
 668
 669     view = W_GetViewForXWindow(event->xany.display, event->xbutton.window);
 670
 671     if (!view)
 672         return False;
 673
 674     if (view->screen->lastClickWindow != event->xbutton.window)
 675         return False;
 676
 677     if (event->xbutton.time - view->screen->lastClickTime
 678         < WINGsConfiguration.doubleClickDelay) {
 679         view->screen->lastClickTime = 0;
 680         view->screen->lastClickWindow = None;
 681         view->screen->ignoreNextDoubleClick = 1;
 682         return True;
 683     } else
 684         return False;
 685 }
 686
 687
 688 Bool
 689 W_WaitForEvent(Display *dpy, unsigned long xeventmask)
 690 {
 691 #if defined(HAVE_POLL) && defined(HAVE_POLL_H) && !defined(HAVE_SELECT)
 692     struct pollfd *fds;
 693     InputHandler *handler;
 694     int count, timeout, nfds, i, retval;
 695
 696     if (inputHandler)
 697         nfds = WMGetBagItemCount(inputHandler);
 698     else
 699         nfds = 0;
 700
 701     fds = wmalloc(nfds+1 * sizeof(struct pollfd));
 702     /* put this to the end of array to avoid using ranges from 1 to nfds+1 */
 703     fds[nfds].fd = ConnectionNumber(dpy);
 704     fds[nfds].events = POLLIN;
 705
 706     for (i = 0; i<nfds; i++) {
 707         handler = WMGetFromBag(inputHandler, i);
 708         fds[i].fd = handler->fd;
 709         fds[i].events = 0;
 710         if (handler->mask & WIReadMask)
 711             fds[i].events |= POLLIN;
 712
 713         if (handler->mask & WIWriteMask)
 714             fds[i].events |= POLLOUT;
 715
 716 #if 0 /* FIXME */
 717         if (handler->mask & WIExceptMask)
 718             FD_SET(handler->fd, &eset);
 719 #endif
 720     }
 721
 722     /*
 723      * Setup the select() timeout to the estimated time until the
 724      * next timer expires.
 725      */
 726     if (timerPending()) {
 727         struct timeval tv;
 728         delayUntilNextTimerEvent(&tv);
 729         timeout = tv.tv_sec * 1000 + tv.tv_usec / 1000;
 730     } else {
 731         timeout = -1;
 732     }
 733
 734     if (xeventmask==0) {
 735         if (XPending(dpy))
 736             return True;
 737     } else {
 738         XEvent ev;
 739         if (XCheckMaskEvent(dpy, xeventmask, &ev)) {
 740             XPutBackEvent(dpy, &ev);
 741             return True;
 742         }
 743     }
 744
 745     count = poll(fds, nfds, timeout);
 746
 747     if (count>0 && nfds>0) {
 748         WMBag *handlerCopy = WMCreateBag(nfds);
 749
 750         for (i=0; i<nfds; i++)
 751             WMPutInBag(handlerCopy, WMGetFromBag(inputHandler, i));
 752
 753         for (i=0; i<nfds; i++) {
 754             int mask;
 755
 756             handler = WMGetFromBag(handlerCopy, i);
 757             /* check if the handler still exist or was removed by a callback */
 758             if (WMGetFirstInBag(inputHandler, handler) == WBNotFound)
 759                 continue;
 760
 761             mask = 0;
 762
 763             if ((handler->mask & WIReadMask) &&
 764                 (fds[i].revents & (POLLIN|POLLRDNORM|POLLRDBAND|POLLPRI)))
 765                 mask |= WIReadMask;
 766
 767             if ((handler->mask & WIWriteMask) &&
 768                 (fds[i].revents & (POLLOUT | POLLWRBAND)))
 769                 mask |= WIWriteMask;
 770
 771             if ((handler->mask & WIExceptMask) &&
 772                 (fds[i].revents & (POLLHUP | POLLNVAL | POLLERR)))
 773                 mask |= WIExceptMask;
 774
 775             if (mask!=0 && handler->callback) {
 776                 (*handler->callback)(handler->fd, mask,
 777                                      handler->clientData);
 778             }
 779         }
 780
 781         WMFreeBag(handlerCopy);
 782     }
 783
 784     retval = fds[nfds].revents & (POLLIN|POLLRDNORM|POLLRDBAND|POLLPRI);
 785     wfree(fds);
 786
 787     W_FlushASAPNotificationQueue();
 788
 789     return retval;
 790 #else /* not HAVE_POLL */
 791 #ifdef HAVE_SELECT
 792     struct timeval timeout;
 793     struct timeval *timeoutPtr;
 794     fd_set rset, wset, eset;
 795     int maxfd, nfds, i;
 796     int count;
 797     InputHandler *handler;
 798
 799     FD_ZERO(&rset);
 800     FD_ZERO(&wset);
 801     FD_ZERO(&eset);
 802
 803     FD_SET(ConnectionNumber(dpy), &rset);
 804     maxfd = ConnectionNumber(dpy);
 805
 806     if (inputHandler)
 807         nfds = WMGetBagItemCount(inputHandler);
 808     else
 809         nfds = 0;
 810
 811     for (i=0; i<nfds; i++) {
 812         handler = WMGetFromBag(inputHandler, i);
 813         if (handler->mask & WIReadMask)
 814             FD_SET(handler->fd, &rset);
 815
 816         if (handler->mask & WIWriteMask)
 817             FD_SET(handler->fd, &wset);
 818
 819         if (handler->mask & WIExceptMask)
 820             FD_SET(handler->fd, &eset);
 821
 822         if (maxfd < handler->fd)
 823             maxfd = handler->fd;
 824     }
 825
 826
 827     /*
 828      * Setup the select() timeout to the estimated time until the
 829      * next timer expires.
 830      */
 831     if (timerPending()) {
 832         delayUntilNextTimerEvent(&timeout);
 833         timeoutPtr = &timeout;
 834     } else {
 835         timeoutPtr = (struct timeval*)0;
 836     }
 837
 838     XSync(dpy, False);
 839     if (xeventmask==0) {
 840         if (XPending(dpy))
 841             return True;
 842     } else {
 843         XEvent ev;
 844         if (XCheckMaskEvent(dpy, xeventmask, &ev)) {
 845             XPutBackEvent(dpy, &ev);
 846             return True;
 847         }
 848     }
 849
 850     count = select(1 + maxfd, &rset, &wset, &eset, timeoutPtr);
 851
 852     if (count>0 && nfds>0) {
 853         WMBag *handlerCopy = WMCreateBag(nfds);
 854
 855         for (i=0; i<nfds; i++)
 856             WMPutInBag(handlerCopy, WMGetFromBag(inputHandler, i));
 857
 858         for (i=0; i<nfds; i++) {
 859             int mask;
 860
 861             handler = WMGetFromBag(handlerCopy, i);
 862             /* check if the handler still exist or was removed by a callback */
 863             if (WMGetFirstInBag(inputHandler, handler) == WBNotFound)
 864                 continue;
 865
 866             mask = 0;
 867
 868             if ((handler->mask & WIReadMask) && FD_ISSET(handler->fd, &rset))
 869                 mask |= WIReadMask;
 870
 871             if ((handler->mask & WIWriteMask) && FD_ISSET(handler->fd, &wset))
 872                 mask |= WIWriteMask;
 873
 874             if ((handler->mask & WIExceptMask) && FD_ISSET(handler->fd, &eset))
 875                 mask |= WIExceptMask;
 876
 877             if (mask!=0 && handler->callback) {
 878                 (*handler->callback)(handler->fd, mask,
 879                                      handler->clientData);
 880             }
 881         }
 882
 883         WMFreeBag(handlerCopy);
 884     }
 885
 886     W_FlushASAPNotificationQueue();
 887
 888     return FD_ISSET(ConnectionNumber(dpy), &rset);
 889 #else /* not HAVE_SELECT, not HAVE_POLL */
 890 Neither select nor poll. You lose.
 891 #endif /* HAVE_SELECT */
 892 #endif /* HAVE_POLL */
 893 }
 894
 895
 896 void
 897 WMNextEvent(Display *dpy, XEvent *event)
 898 {
 899     /* Check any expired timers */
 900     checkTimerHandlers();
 901
 902     while (XPending(dpy) == 0) {
 903         /* Do idle stuff */
 904         /* Do idle and timer stuff while there are no timer or X events */
 905         while (!XPending(dpy) && checkIdleHandlers()) {
 906             /* dispatch timer events */
 907             checkTimerHandlers();
 908         }
 909
 910         /*
 911          * Make sure that new events did not arrive while we were doing
 912          * timer/idle stuff. Or we might block forever waiting for
 913          * an event that already arrived.
 914          */
 915         /* wait to something happen */
 916         W_WaitForEvent(dpy, 0);
 917
 918         /* Check any expired timers */
 919         checkTimerHandlers();
 920     }
 921
 922     XNextEvent(dpy, event);
 923 }
 924
 925 #if 0
 926 void
 927 WMMaskEvent(Display *dpy, long mask, XEvent *event)
 928 {
 929     unsigned long milliseconds;
 930     struct timeval timeout;
 931     struct timeval *timeoutOrInfty;
 932     fd_set readset;
 933
 934     while (!XCheckMaskEvent(dpy, mask, event)) {
 935         /* Do idle stuff while there are no timer or X events */
 936         while (checkIdleHandlers()) {
 937             if (XCheckMaskEvent(dpy, mask, event))
 938                 return;
 939         }
 940
 941         /*
 942          * Setup the select() timeout to the estimated time until the
 943          * next timer expires.
 944          */
 945         if (timerPending()) {
 946             delayUntilNextTimerEvent(&timeout);
 947             timeoutOrInfty = &timeout;
 948         } else {
 949             timeoutOrInfty = (struct timeval*)0;
 950         }
 951
 952         if (XCheckMaskEvent(dpy, mask, event))
 953             return;
 954
 955         /* Wait for input on the X connection socket */
 956         FD_ZERO(&readset);
 957         FD_SET(ConnectionNumber(dpy), &readset);
 958         select(1 + ConnectionNumber(dpy), &readset, (fd_set*)0, (fd_set*)0,
 959                timeoutOrInfty);
 960
 961         /* Check any expired timers */
 962         checkTimerHandlers();
 963     }
 964 }
 965 #endif
 966 #if 1
 967 /*
 968  * Cant use this because XPending() will make W_WaitForEvent
 969  * return even if the event in the queue is not what we want,
 970  * and if we block until some new event arrives from the
 971  * server, other events already in the queue (like Expose)
 972  * will be deferred.
 973  */
 974 void
 975 WMMaskEvent(Display *dpy, long mask, XEvent *event)
 976 {
 977     while (!XCheckMaskEvent(dpy, mask, event)) {
 978         /* Do idle stuff while there are no timer or X events */
 979         while (checkIdleHandlers()) {
 980             if (XCheckMaskEvent(dpy, mask, event))
 981                 return;
 982         }
 983
 984         /* Wait for input on the X connection socket */
 985         W_WaitForEvent(dpy, mask);
 986
 987         /* Check any expired timers */
 988         checkTimerHandlers();
 989     }
 990 }
 991 #endif
 992
 993 Bool
 994 WMScreenPending(WMScreen *scr)
 995 {
 996     if (XPending(scr->display))
 997         return True;
 998     else
 999         return False;
1000 }
1001
1002
1003 WMEventHook*
1004 WMHookEventHandler(WMEventHook *handler)
1005 {
1006     WMEventHook *oldHandler = extraEventHandler;
1007
1008     extraEventHandler = handler;
1009
1010     return oldHandler;
1011 }
1012
1013