WINGs/wevent.c

   1
   2
   3 /*
   4  * This event handling stuff was based 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 >= 0) {
 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 >= 0) {
 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     int i, n;
 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     n = WMGetBagItemCount(idleHandler);
 316     handlerCopy = WMCreateBag(n);
 317     for (i=0; i<n; i++)
 318         WMPutInBag(handlerCopy, WMGetFromBag(idleHandler, i));
 319
 320     for (i=0; i<n; i++) {
 321         handler = WMGetFromBag(handlerCopy, i);
 322         /* check if the handler still exist or was removed by a callback */
 323         if (WMGetFirstInBag(idleHandler, handler)<0)
 324             continue;
 325
 326         (*handler->callback)(handler->clientData);
 327         WMDeleteIdleHandler(handler);
 328     }
 329
 330     WMFreeBag(handlerCopy);
 331
 332     W_FlushIdleNotificationQueue();
 333
 334     /* this is not necesarrily False, because one handler can re-add itself */
 335     return (WMGetBagItemCount(idleHandler)>0);
 336 }
 337
 338
 339
 340 static void
 341 checkTimerHandlers()
 342 {
 343     TimerHandler *handler;
 344     struct timeval now;
 345
 346     if (!timerHandler) {
 347         W_FlushASAPNotificationQueue();
 348         return;
 349     }
 350
 351     rightNow(&now);
 352
 353     while (timerHandler && IS_AFTER(now, timerHandler->when)) {
 354         handler = timerHandler;
 355         timerHandler = timerHandler->next;
 356         handler->next = NULL;
 357         (*handler->callback)(handler->clientData);
 358         wfree(handler);
 359     }
 360
 361     W_FlushASAPNotificationQueue();
 362 }
 363
 364
 365
 366 static void
 367 delayUntilNextTimerEvent(struct timeval *delay)
 368 {
 369     struct timeval now;
 370
 371     if (!timerHandler) {
 372         /* The return value of this function is only valid if there _are_
 373          timers active. */
 374         delay->tv_sec = 0;
 375         delay->tv_usec = 0;
 376         return;
 377     }
 378
 379     rightNow(&now);
 380     if (IS_AFTER(now, timerHandler->when)) {
 381         delay->tv_sec = 0;
 382         delay->tv_usec = 0;
 383     } else {
 384         delay->tv_sec = timerHandler->when.tv_sec - now.tv_sec;
 385         delay->tv_usec = timerHandler->when.tv_usec - now.tv_usec;
 386         if (delay->tv_usec < 0) {
 387             delay->tv_usec += 1000000;
 388             delay->tv_sec--;
 389         }
 390     }
 391 }
 392
 393
 394
 395
 396 /*
 397  * WMCreateEventHandler--
 398  *      Create an event handler and put it in the event handler list for the
 399  * view. If the same callback and clientdata are already used in another
 400  * handler, the masks are swapped.
 401  *
 402  */
 403 void
 404 WMCreateEventHandler(WMView *view, unsigned long mask, WMEventProc *eventProc,
 405                      void *clientData)
 406 {
 407     W_EventHandler *handler;
 408     W_EventHandler *ptr = view->handlerList;
 409     unsigned long eventMask;
 410
 411     if (ptr==NULL) {
 412         handler = wmalloc(sizeof(W_EventHandler));
 413
 414         handler->nextHandler = NULL;
 415
 416         view->handlerList = handler;
 417
 418         eventMask = mask;
 419     } else {
 420         handler = NULL;
 421         eventMask = mask;
 422         while (ptr != NULL) {
 423             if (ptr->clientData == clientData && ptr->proc == eventProc) {
 424                 handler = ptr;
 425             }
 426             eventMask |= ptr->eventMask;
 427
 428             ptr = ptr->nextHandler;
 429         }
 430         if (!handler) {
 431             handler = wmalloc(sizeof(W_EventHandler));
 432             handler->nextHandler = view->handlerList;
 433             view->handlerList = handler;
 434         }
 435     }
 436
 437     /* select events for window */
 438     handler->eventMask = mask;
 439     handler->proc = eventProc;
 440     handler->clientData = clientData;
 441 }
 442
 443
 444 /*
 445  * WMDeleteEventHandler--
 446  *      Delete event handler matching arguments from windows
 447  * event handler list.
 448  *
 449  */
 450 void
 451 WMDeleteEventHandler(WMView *view, unsigned long mask, WMEventProc *eventProc,
 452                      void *clientData)
 453 {
 454     W_EventHandler *handler, *ptr, *pptr;
 455
 456     ptr = view->handlerList;
 457
 458     handler = NULL;
 459     pptr = NULL;
 460
 461     while (ptr!=NULL) {
 462         if (ptr->eventMask == mask && ptr->proc == eventProc
 463             && ptr->clientData == clientData) {
 464             handler = ptr;
 465             break;
 466         }
 467         pptr = ptr;
 468         ptr = ptr->nextHandler;
 469     }
 470
 471     if (!handler)
 472         return;
 473
 474     if (!pptr) {
 475         view->handlerList = handler->nextHandler;
 476     } else {
 477         pptr->nextHandler = handler->nextHandler;
 478     }
 479     wfree(handler);
 480 }
 481
 482
 483
 484 void
 485 W_CleanUpEvents(WMView *view)
 486 {
 487     W_EventHandler *ptr, *nptr;
 488
 489     ptr = view->handlerList;
 490
 491     while (ptr!=NULL) {
 492         nptr = ptr->nextHandler;
 493         wfree(ptr);
 494         ptr = nptr;
 495     }
 496 }
 497
 498
 499
 500 static Time
 501 getEventTime(WMScreen *screen, XEvent *event)
 502 {
 503     switch (event->type) {
 504      case ButtonPress:
 505      case ButtonRelease:
 506         return event->xbutton.time;
 507      case KeyPress:
 508      case KeyRelease:
 509         return event->xkey.time;
 510      case MotionNotify:
 511         return event->xmotion.time;
 512      case EnterNotify:
 513      case LeaveNotify:
 514         return event->xcrossing.time;
 515      case PropertyNotify:
 516         return event->xproperty.time;
 517      case SelectionClear:
 518         return event->xselectionclear.time;
 519      case SelectionRequest:
 520         return event->xselectionrequest.time;
 521      case SelectionNotify:
 522         return event->xselection.time;
 523      default:
 524         return screen->lastEventTime;
 525     }
 526 }
 527
 528
 529 void
 530 W_CallDestroyHandlers(W_View *view)
 531 {
 532     XEvent event;
 533     W_EventHandler *hPtr;
 534
 535     event.type = DestroyNotify;
 536     event.xdestroywindow.window = view->window;
 537     event.xdestroywindow.event = view->window;
 538     hPtr = view->handlerList;
 539     while (hPtr!=NULL) {
 540         if (hPtr->eventMask & StructureNotifyMask) {
 541             (*hPtr->proc)(&event, hPtr->clientData);
 542         }
 543
 544         hPtr = hPtr->nextHandler;
 545     }
 546 }
 547
 548
 549 int
 550 WMHandleEvent(XEvent *event)
 551 {
 552     W_EventHandler *hPtr;
 553     W_View *view, *vPtr, *toplevel;
 554     unsigned long mask;
 555     Window window;
 556
 557     if (event->type == MappingNotify) {
 558         XRefreshKeyboardMapping(&event->xmapping);
 559         return True;
 560     }
 561
 562     mask = eventMasks[event->xany.type];
 563
 564     window = event->xany.window;
 565
 566     /* diferentiate SubstructureNotify with StructureNotify */
 567     if (mask == StructureNotifyMask) {
 568         if (event->xmap.event != event->xmap.window) {
 569             mask = SubstructureNotifyMask;
 570             window = event->xmap.event;
 571         }
 572     }
 573     view = W_GetViewForXWindow(event->xany.display, window);
 574     if (!view) {
 575         if (extraEventHandler)
 576             (extraEventHandler)(event);
 577
 578         return False;
 579     }
 580
 581     view->screen->lastEventTime = getEventTime(view->screen, event);
 582
 583     toplevel = W_TopLevelOfView(view);
 584
 585     if (event->type == SelectionNotify || event->type == SelectionClear
 586         || event->type == SelectionRequest) {
 587         /* handle selection related events */
 588         W_HandleSelectionEvent(event);
 589     }
 590
 591     /* if it's a key event, redispatch it to the focused control */
 592     if (mask & (KeyPressMask|KeyReleaseMask)) {
 593         W_View *focused = W_FocusedViewOfToplevel(toplevel);
 594
 595         if (focused) {
 596             view = focused;
 597         }
 598     }
 599
 600     /* compress Motion events */
 601     if (event->type == MotionNotify && !view->flags.dontCompressMotion) {
 602         while (XPending(event->xmotion.display)) {
 603             XEvent ev;
 604             XPeekEvent(event->xmotion.display, &ev);
 605             if (ev.type == MotionNotify
 606                 && event->xmotion.window == ev.xmotion.window
 607                 && event->xmotion.subwindow == ev.xmotion.subwindow) {
 608                 /* replace events */
 609                 XNextEvent(event->xmotion.display, event);
 610             } else break;
 611         }
 612     }
 613
 614     /* compress expose events */
 615     if (event->type == Expose && !view->flags.dontCompressExpose) {
 616         while (XCheckTypedWindowEvent(event->xexpose.display, view->window,
 617                                       Expose, event));
 618     }
 619
 620
 621     if (view->screen->modal && toplevel!=view->screen->modalView
 622         && !toplevel->flags.worksWhenModal) {
 623         if (event->type == KeyPress || event->type == KeyRelease
 624             || event->type == MotionNotify || event->type == ButtonPress
 625             || event->type == ButtonRelease
 626             || event->type == FocusIn || event->type == FocusOut) {
 627             return True;
 628         }
 629     }
 630
 631     /* do balloon stuffs */
 632     if (event->type == EnterNotify)
 633         W_BalloonHandleEnterView(view);
 634     else if (event->type == LeaveNotify)
 635         W_BalloonHandleLeaveView(view);
 636
 637     /* This is a hack. It will make the panel be secure while
 638      * the event handlers are handled, as some event handler
 639      * might destroy the widget. */
 640     W_RetainView(toplevel);
 641
 642     hPtr = view->handlerList;
 643
 644     while (hPtr!=NULL) {
 645         W_EventHandler *tmp;
 646
 647         tmp = hPtr->nextHandler;
 648
 649         if ((hPtr->eventMask & mask)) {
 650             (*hPtr->proc)(event, hPtr->clientData);
 651         }
 652
 653         hPtr = tmp;
 654     }
 655
 656     /* pass the event to the top level window of the widget */
 657     if (view->parent!=NULL) {
 658         vPtr = view;
 659         while (vPtr->parent!=NULL)
 660             vPtr = vPtr->parent;
 661
 662         hPtr = vPtr->handlerList;
 663
 664         while (hPtr!=NULL) {
 665
 666             if (hPtr->eventMask & mask) {
 667                 (*hPtr->proc)(event, hPtr->clientData);
 668             }
 669             hPtr = hPtr->nextHandler;
 670         }
 671     }
 672
 673     /* save button click info to track double-clicks */
 674     if (view->screen->ignoreNextDoubleClick) {
 675         view->screen->ignoreNextDoubleClick = 0;
 676     } else {
 677         if (event->type == ButtonPress) {
 678             view->screen->lastClickWindow = event->xbutton.window;
 679             view->screen->lastClickTime = event->xbutton.time;
 680         }
 681     }
 682
 683     W_ReleaseView(toplevel);
 684
 685     return True;
 686 }
 687
 688
 689 int
 690 WMIsDoubleClick(XEvent *event)
 691 {
 692     W_View *view;
 693
 694     if (event->type != ButtonPress)
 695         return False;
 696
 697     view = W_GetViewForXWindow(event->xany.display, event->xbutton.window);
 698
 699     if (!view)
 700         return False;
 701
 702     if (view->screen->lastClickWindow != event->xbutton.window)
 703         return False;
 704
 705     if (event->xbutton.time - view->screen->lastClickTime
 706         < WINGsConfiguration.doubleClickDelay) {
 707         view->screen->lastClickTime = 0;
 708         view->screen->lastClickWindow = None;
 709         view->screen->ignoreNextDoubleClick = 1;
 710         return True;
 711     } else
 712         return False;
 713 }
 714
 715
 716 Bool
 717 W_WaitForEvent(Display *dpy, unsigned long xeventmask)
 718 {
 719 #if defined(HAVE_POLL) && defined(HAVE_POLL_H) && !defined(HAVE_SELECT)
 720     struct pollfd *fds;
 721     InputHandler *handler;
 722     int count, timeout, nfds, i, retval;
 723
 724     if (inputHandler)
 725         nfds = WMGetBagItemCount(inputHandler);
 726     else
 727         nfds = 0;
 728
 729     fds = wmalloc(nfds+1 * sizeof(struct pollfd));
 730     /* put this to the end of array to avoid using ranges from 1 to nfds+1 */
 731     fds[nfds].fd = ConnectionNumber(dpy);
 732     fds[nfds].events = POLLIN;
 733
 734     for (i = 0; i<nfds; i++) {
 735         handler = WMGetFromBag(inputHandler, i);
 736         fds[i].fd = handler->fd;
 737         fds[i].events = 0;
 738         if (handler->mask & WIReadMask)
 739             fds[i].events |= POLLIN;
 740
 741         if (handler->mask & WIWriteMask)
 742             fds[i].events |= POLLOUT;
 743
 744 #if 0 /* FIXME */
 745         if (handler->mask & WIExceptMask)
 746             FD_SET(handler->fd, &eset);
 747 #endif
 748     }
 749
 750     /*
 751      * Setup the select() timeout to the estimated time until the
 752      * next timer expires.
 753      */
 754     if (timerPending()) {
 755         struct timeval tv;
 756         delayUntilNextTimerEvent(&tv);
 757         timeout = tv.tv_sec * 1000 + tv.tv_usec / 1000;
 758     } else {
 759         timeout = -1;
 760     }
 761
 762     if (xeventmask==0) {
 763         if (XPending(dpy))
 764             return True;
 765     } else {
 766         XEvent ev;
 767         if (XCheckMaskEvent(dpy, xeventmask, &ev)) {
 768             XPutBackEvent(dpy, &ev);
 769             return True;
 770         }
 771     }
 772
 773     count = poll(fds, nfds, timeout);
 774
 775     if (count>0 && nfds>0) {
 776         WMBag *handlerCopy = WMCreateBag(nfds);
 777
 778         for (i=0; i<nfds; i++)
 779             WMPutInBag(handlerCopy, WMGetFromBag(inputHandler, i));
 780
 781         for (i=0; i<nfds; i++) {
 782             int mask;
 783
 784             handler = WMGetFromBag(handlerCopy, i);
 785             /* check if the handler still exist or was removed by a callback */
 786             if (WMGetFirstInBag(inputHandler, handler)<0)
 787                 continue;
 788
 789             mask = 0;
 790
 791             if ((handler->mask & WIReadMask) &&
 792                 (fds[i].revents & (POLLIN|POLLRDNORM|POLLRDBAND|POLLPRI)))
 793                 mask |= WIReadMask;
 794
 795             if ((handler->mask & WIWriteMask) &&
 796                 (fds[i].revents & (POLLOUT | POLLWRBAND)))
 797                 mask |= WIWriteMask;
 798
 799             if ((handler->mask & WIExceptMask) &&
 800                 (fds[i].revents & (POLLHUP | POLLNVAL | POLLERR)))
 801                 mask |= WIExceptMask;
 802
 803             if (mask!=0 && handler->callback) {
 804                 (*handler->callback)(handler->fd, mask,
 805                                      handler->clientData);
 806             }
 807         }
 808
 809         WMFreeBag(handlerCopy);
 810     }
 811
 812     retval = fds[nfds].revents & (POLLIN|POLLRDNORM|POLLRDBAND|POLLPRI);
 813     wfree(fds);
 814
 815     W_FlushASAPNotificationQueue();
 816
 817     return retval;
 818 #else /* not HAVE_POLL */
 819 #ifdef HAVE_SELECT
 820     struct timeval timeout;
 821     struct timeval *timeoutPtr;
 822     fd_set rset, wset, eset;
 823     int maxfd, nfds, i;
 824     int count;
 825     InputHandler *handler;
 826
 827     FD_ZERO(&rset);
 828     FD_ZERO(&wset);
 829     FD_ZERO(&eset);
 830
 831     FD_SET(ConnectionNumber(dpy), &rset);
 832     maxfd = ConnectionNumber(dpy);
 833
 834     if (inputHandler)
 835         nfds = WMGetBagItemCount(inputHandler);
 836     else
 837         nfds = 0;
 838
 839     for (i=0; i<nfds; i++) {
 840         handler = WMGetFromBag(inputHandler, i);
 841         if (handler->mask & WIReadMask)
 842             FD_SET(handler->fd, &rset);
 843
 844         if (handler->mask & WIWriteMask)
 845             FD_SET(handler->fd, &wset);
 846
 847         if (handler->mask & WIExceptMask)
 848             FD_SET(handler->fd, &eset);
 849
 850         if (maxfd < handler->fd)
 851             maxfd = handler->fd;
 852     }
 853
 854
 855     /*
 856      * Setup the select() timeout to the estimated time until the
 857      * next timer expires.
 858      */
 859     if (timerPending()) {
 860         delayUntilNextTimerEvent(&timeout);
 861         timeoutPtr = &timeout;
 862     } else {
 863         timeoutPtr = (struct timeval*)0;
 864     }
 865
 866     XSync(dpy, False);
 867     if (xeventmask==0) {
 868         if (XPending(dpy))
 869             return True;
 870     } else {
 871         XEvent ev;
 872         if (XCheckMaskEvent(dpy, xeventmask, &ev)) {
 873             XPutBackEvent(dpy, &ev);
 874             return True;
 875         }
 876     }
 877
 878     count = select(1 + maxfd, &rset, &wset, &eset, timeoutPtr);
 879
 880     if (count>0 && nfds>0) {
 881         WMBag *handlerCopy = WMCreateBag(nfds);
 882
 883         for (i=0; i<nfds; i++)
 884             WMPutInBag(handlerCopy, WMGetFromBag(inputHandler, i));
 885
 886         for (i=0; i<nfds; i++) {
 887             int mask;
 888
 889             handler = WMGetFromBag(handlerCopy, i);
 890             /* check if the handler still exist or was removed by a callback */
 891             if (WMGetFirstInBag(inputHandler, handler)<0)
 892                 continue;
 893
 894             mask = 0;
 895
 896             if ((handler->mask & WIReadMask) && FD_ISSET(handler->fd, &rset))
 897                 mask |= WIReadMask;
 898
 899             if ((handler->mask & WIWriteMask) && FD_ISSET(handler->fd, &wset))
 900                 mask |= WIWriteMask;
 901
 902             if ((handler->mask & WIExceptMask) && FD_ISSET(handler->fd, &eset))
 903                 mask |= WIExceptMask;
 904
 905             if (mask!=0 && handler->callback) {
 906                 (*handler->callback)(handler->fd, mask,
 907                                      handler->clientData);
 908             }
 909         }
 910
 911         WMFreeBag(handlerCopy);
 912     }
 913
 914     W_FlushASAPNotificationQueue();
 915
 916     return FD_ISSET(ConnectionNumber(dpy), &rset);
 917 #else /* not HAVE_SELECT, not HAVE_POLL */
 918 Neither select nor poll. You lose.
 919 #endif /* HAVE_SELECT */
 920 #endif /* HAVE_POLL */
 921 }
 922
 923
 924 void
 925 WMNextEvent(Display *dpy, XEvent *event)
 926 {
 927     /* Check any expired timers */
 928     checkTimerHandlers();
 929
 930     while (XPending(dpy) == 0) {
 931         /* Do idle stuff */
 932         /* Do idle and timer stuff while there are no timer or X events */
 933         while (!XPending(dpy) && checkIdleHandlers()) {
 934             /* dispatch timer events */
 935             checkTimerHandlers();
 936         }
 937
 938         /*
 939          * Make sure that new events did not arrive while we were doing
 940          * timer/idle stuff. Or we might block forever waiting for
 941          * an event that already arrived.
 942          */
 943         /* wait to something happen */
 944         W_WaitForEvent(dpy, 0);
 945
 946         /* Check any expired timers */
 947         checkTimerHandlers();
 948     }
 949
 950     XNextEvent(dpy, event);
 951 }
 952
 953 #if 0
 954 void
 955 WMMaskEvent(Display *dpy, long mask, XEvent *event)
 956 {
 957     unsigned long milliseconds;
 958     struct timeval timeout;
 959     struct timeval *timeoutOrInfty;
 960     fd_set readset;
 961
 962     while (!XCheckMaskEvent(dpy, mask, event)) {
 963         /* Do idle stuff while there are no timer or X events */
 964         while (checkIdleHandlers()) {
 965             if (XCheckMaskEvent(dpy, mask, event))
 966                 return;
 967         }
 968
 969         /*
 970          * Setup the select() timeout to the estimated time until the
 971          * next timer expires.
 972          */
 973         if (timerPending()) {
 974             delayUntilNextTimerEvent(&timeout);
 975             timeoutOrInfty = &timeout;
 976         } else {
 977             timeoutOrInfty = (struct timeval*)0;
 978         }
 979
 980         if (XCheckMaskEvent(dpy, mask, event))
 981             return;
 982
 983         /* Wait for input on the X connection socket */
 984         FD_ZERO(&readset);
 985         FD_SET(ConnectionNumber(dpy), &readset);
 986         select(1 + ConnectionNumber(dpy), &readset, (fd_set*)0, (fd_set*)0,
 987                timeoutOrInfty);
 988
 989         /* Check any expired timers */
 990         checkTimerHandlers();
 991     }
 992 }
 993 #endif
 994 #if 1
 995 /*
 996  * Cant use this because XPending() will make W_WaitForEvent
 997  * return even if the event in the queue is not what we want,
 998  * and if we block until some new event arrives from the
 999  * server, other events already in the queue (like Expose)
1000  * will be deferred.
1001  */
1002 void
1003 WMMaskEvent(Display *dpy, long mask, XEvent *event)
1004 {
1005     while (!XCheckMaskEvent(dpy, mask, event)) {
1006         /* Do idle stuff while there are no timer or X events */
1007         while (checkIdleHandlers()) {
1008             if (XCheckMaskEvent(dpy, mask, event))
1009                 return;
1010         }
1011
1012         /* Wait for input on the X connection socket */
1013         W_WaitForEvent(dpy, mask);
1014
1015         /* Check any expired timers */
1016         checkTimerHandlers();
1017     }
1018 }
1019 #endif
1020
1021 Bool
1022 WMScreenPending(WMScreen *scr)
1023 {
1024     if (XPending(scr->display))
1025         return True;
1026     else
1027         return False;
1028 }
1029
1030
1031 WMEventHook*
1032 WMHookEventHandler(WMEventHook *handler)
1033 {
1034     WMEventHook *oldHandler = extraEventHandler;
1035
1036     extraEventHandler = handler;
1037
1038     return oldHandler;
1039 }
1040
1041