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 extern _WINGsConfiguration WINGsConfiguration;
  34
  35
  36
  37 typedef struct TimerHandler {
  38     WMCallback          *callback;             /* procedure to call */
  39     struct timeval      when;                  /* when to call the callback */
  40     void                *clientData;
  41     struct TimerHandler *next;
  42 } TimerHandler;
  43
  44
  45 typedef struct IdleHandler {
  46     WMCallback          *callback;
  47     void                *clientData;
  48     struct IdleHandler  *next;
  49 } IdleHandler;
  50
  51
  52 typedef struct InputHandler {
  53     WMInputProc         *callback;
  54     void                *clientData;
  55     int                 fd;
  56     int                 mask;
  57     struct InputHandler *next;
  58 } InputHandler;
  59
  60
  61 /* table to map event types to event masks */
  62 static unsigned long eventMasks[] = {
  63     0,
  64     0,
  65     KeyPressMask,                       /* KeyPress */
  66     KeyReleaseMask,                     /* KeyRelease */
  67     ButtonPressMask,                    /* ButtonPress */
  68     ButtonReleaseMask,                  /* ButtonRelease */
  69     PointerMotionMask|PointerMotionHintMask|ButtonMotionMask
  70             |Button1MotionMask|Button2MotionMask|Button3MotionMask
  71             |Button4MotionMask|Button5MotionMask,
  72                                         /* MotionNotify */
  73     EnterWindowMask,                    /* EnterNotify */
  74     LeaveWindowMask,                    /* LeaveNotify */
  75     FocusChangeMask,                    /* FocusIn */
  76     FocusChangeMask,                    /* FocusOut */
  77     KeymapStateMask,                    /* KeymapNotify */
  78     ExposureMask,                       /* Expose */
  79     ExposureMask,                       /* GraphicsExpose */
  80     ExposureMask,                       /* NoExpose */
  81     VisibilityChangeMask,               /* VisibilityNotify */
  82     SubstructureNotifyMask,             /* CreateNotify */
  83     StructureNotifyMask,                /* DestroyNotify */
  84     StructureNotifyMask,                /* UnmapNotify */
  85     StructureNotifyMask,                /* MapNotify */
  86     SubstructureRedirectMask,           /* MapRequest */
  87     StructureNotifyMask,                /* ReparentNotify */
  88     StructureNotifyMask,                /* ConfigureNotify */
  89     SubstructureRedirectMask,           /* ConfigureRequest */
  90     StructureNotifyMask,                /* GravityNotify */
  91     ResizeRedirectMask,                 /* ResizeRequest */
  92     StructureNotifyMask,                /* CirculateNotify */
  93     SubstructureRedirectMask,           /* CirculateRequest */
  94     PropertyChangeMask,                 /* PropertyNotify */
  95     0,                                  /* SelectionClear */
  96     0,                                  /* SelectionRequest */
  97     0,                                  /* SelectionNotify */
  98     ColormapChangeMask,                 /* ColormapNotify */
  99     ClientMessageMask,                  /* ClientMessage */
 100     0,                                  /* Mapping Notify */
 101 };
 102
 103
 104
 105 /* queue of timer event handlers */
 106 static TimerHandler *timerHandler=NULL;
 107
 108 static IdleHandler *idleHandler=NULL;
 109
 110 static InputHandler *inputHandler=NULL;
 111
 112 /* hook for other toolkits or wmaker process their events */
 113 static WMEventHook *extraEventHandler=NULL;
 114
 115
 116
 117 #define timerPending()  (timerHandler)
 118
 119 #define idlePending()   (idleHandler)
 120
 121
 122 static void
 123 rightNow(struct timeval *tv) {
 124     X_GETTIMEOFDAY(tv);
 125 }
 126
 127 /* is t1 after t2 ? */
 128 #define IS_AFTER(t1, t2)        (((t1).tv_sec > (t2).tv_sec) || \
 129                                  (((t1).tv_sec == (t2).tv_sec) \
 130                                   && ((t1).tv_usec > (t2).tv_usec)))
 131
 132
 133 static void
 134 addmillisecs(struct timeval *tv, int milliseconds)
 135 {
 136     tv->tv_usec += milliseconds*1000;
 137
 138     tv->tv_sec += tv->tv_usec/1000000;
 139     tv->tv_usec = tv->tv_usec%1000000;
 140 }
 141
 142
 143 WMHandlerID
 144 WMAddTimerHandler(int milliseconds, WMCallback *callback, void *cdata)
 145 {
 146     TimerHandler *handler, *tmp;
 147
 148     handler = malloc(sizeof(TimerHandler));
 149     if (!handler)
 150       return NULL;
 151
 152     rightNow(&handler->when);
 153     addmillisecs(&handler->when, milliseconds);
 154     handler->callback = callback;
 155     handler->clientData = cdata;
 156     /* insert callback in queue, sorted by time left */
 157     if (!timerHandler || !IS_AFTER(handler->when, timerHandler->when)) {
 158         /* first in the queue */
 159         handler->next = timerHandler;
 160         timerHandler = handler;
 161     } else {
 162         tmp = timerHandler;
 163         while (tmp->next && IS_AFTER(handler->when, tmp->next->when)) {
 164             tmp = tmp->next;
 165         }
 166         handler->next = tmp->next;
 167         tmp->next = handler;
 168     }
 169     return handler;
 170 }
 171
 172
 173
 174 void
 175 WMDeleteTimerWithClientData(void *cdata)
 176 {
 177     TimerHandler *handler, *tmp;
 178
 179     if (!cdata || !timerHandler)
 180         return;
 181
 182     tmp = timerHandler;
 183     if (tmp->clientData==cdata) {
 184         timerHandler = tmp->next;
 185         free(tmp);
 186     } else {
 187         while (tmp->next) {
 188             if (tmp->next->clientData==cdata) {
 189                 handler = tmp->next;
 190                 tmp->next = handler->next;
 191                 free(handler);
 192                 break;
 193             }
 194             tmp = tmp->next;
 195         }
 196     }
 197 }
 198
 199
 200
 201 void
 202 WMDeleteTimerHandler(WMHandlerID handlerID)
 203 {
 204     TimerHandler *tmp, *handler=(TimerHandler*)handlerID;
 205
 206     if (!handler || !timerHandler)
 207       return;
 208
 209     tmp = timerHandler;
 210     if (tmp==handler) {
 211         timerHandler = handler->next;
 212         free(handler);
 213     } else {
 214         while (tmp->next) {
 215             if (tmp->next==handler) {
 216                 tmp->next=handler->next;
 217                 free(handler);
 218                 break;
 219             }
 220             tmp = tmp->next;
 221         }
 222     }
 223 }
 224
 225
 226
 227 WMHandlerID
 228 WMAddIdleHandler(WMCallback *callback, void *cdata)
 229 {
 230     IdleHandler *handler, *tmp;
 231
 232     handler = malloc(sizeof(IdleHandler));
 233     if (!handler)
 234         return NULL;
 235
 236     handler->callback = callback;
 237     handler->clientData = cdata;
 238     handler->next = NULL;
 239     /* add callback at end of queue */
 240     if (!idleHandler) {
 241         idleHandler = handler;
 242     } else {
 243         tmp = idleHandler;
 244         while (tmp->next) {
 245             tmp = tmp->next;
 246         }
 247         tmp->next = handler;
 248     }
 249
 250     return handler;
 251 }
 252
 253
 254
 255 void
 256 WMDeleteIdleHandler(WMHandlerID handlerID)
 257 {
 258     IdleHandler *tmp, *handler = (IdleHandler*)handlerID;
 259
 260     if (!handler || !idleHandler)
 261         return;
 262
 263     tmp = idleHandler;
 264     if (tmp == handler) {
 265         idleHandler = handler->next;
 266         free(handler);
 267     } else {
 268         while (tmp->next) {
 269             if (tmp->next == handler) {
 270                 tmp->next = handler->next;
 271                 free(handler);
 272                 break;
 273             }
 274             tmp = tmp->next;
 275         }
 276     }
 277 }
 278
 279
 280
 281 WMHandlerID
 282 WMAddInputHandler(int fd, int condition, WMInputProc *proc, void *clientData)
 283 {
 284     InputHandler *handler;
 285
 286     handler = wmalloc(sizeof(InputHandler));
 287
 288     handler->fd = fd;
 289     handler->mask = condition;
 290     handler->callback = proc;
 291     handler->clientData = clientData;
 292
 293     handler->next = inputHandler;
 294
 295     inputHandler = handler;
 296
 297     return handler;
 298 }
 299
 300
 301 void
 302 WMDeleteInputHandler(WMHandlerID handlerID)
 303 {
 304     InputHandler *tmp, *handler = (InputHandler*)handlerID;
 305
 306     if (!handler || !inputHandler)
 307         return;
 308
 309     tmp = inputHandler;
 310     if (tmp == handler) {
 311         inputHandler = handler->next;
 312         free(handler);
 313     } else {
 314         while (tmp->next) {
 315             if (tmp->next == handler) {
 316                 tmp->next = handler->next;
 317                 free(handler);
 318                 break;
 319             }
 320             tmp = tmp->next;
 321         }
 322     }
 323 }
 324
 325
 326 static void
 327 checkIdleHandlers()
 328 {
 329     IdleHandler *handler, *tmp;
 330
 331     if (!idleHandler) {
 332         W_FlushIdleNotificationQueue();
 333         return;
 334     }
 335
 336     handler = idleHandler;
 337
 338     /* we will process all idleHandlers so, empty the handler list */
 339     idleHandler = NULL;
 340
 341     while (handler) {
 342         tmp = handler->next;
 343         (*handler->callback)(handler->clientData);
 344         /* remove the handler */
 345         free(handler);
 346
 347         handler = tmp;
 348     }
 349     W_FlushIdleNotificationQueue();
 350 }
 351
 352
 353
 354 static void
 355 checkTimerHandlers()
 356 {
 357     TimerHandler *handler;
 358     struct timeval now;
 359
 360     rightNow(&now);
 361
 362     while (timerHandler && IS_AFTER(now, timerHandler->when)) {
 363         handler = timerHandler;
 364         timerHandler = timerHandler->next;
 365         handler->next = NULL;
 366         (*handler->callback)(handler->clientData);
 367         free(handler);
 368     }
 369
 370     W_FlushASAPNotificationQueue();
 371 }
 372
 373
 374
 375 static void
 376 delayUntilNextTimerEvent(struct timeval *delay)
 377 {
 378     struct timeval now;
 379
 380     if (!timerHandler) {
 381         /* The return value of this function is only valid if there _are_
 382          timers active. */
 383         delay->tv_sec = 0;
 384         delay->tv_usec = 0;
 385         return;
 386     }
 387
 388     rightNow(&now);
 389     if (IS_AFTER(now, timerHandler->when)) {
 390         delay->tv_sec = 0;
 391         delay->tv_usec = 0;
 392     } else {
 393         delay->tv_sec = timerHandler->when.tv_sec - now.tv_sec;
 394         delay->tv_usec = timerHandler->when.tv_usec - now.tv_usec;
 395         if (delay->tv_usec < 0) {
 396             delay->tv_usec += 1000000;
 397             delay->tv_sec--;
 398         }
 399     }
 400 }
 401
 402
 403
 404
 405 /*
 406  * WMCreateEventHandler--
 407  *      Create an event handler and put it in the event handler list for the
 408  * view. If the same callback and clientdata are already used in another
 409  * handler, the masks are swapped.
 410  *
 411  */
 412 void
 413 WMCreateEventHandler(WMView *view, unsigned long mask, WMEventProc *eventProc,
 414                      void *clientData)
 415 {
 416     W_EventHandler *handler;
 417     W_EventHandler *ptr = view->handlerList;
 418     unsigned long eventMask;
 419
 420     if (ptr==NULL) {
 421         handler = wmalloc(sizeof(W_EventHandler));
 422
 423         handler->nextHandler = NULL;
 424
 425         view->handlerList = handler;
 426
 427         eventMask = mask;
 428     } else {
 429         handler = NULL;
 430         eventMask = mask;
 431         while (ptr != NULL) {
 432             if (ptr->clientData == clientData && ptr->proc == eventProc) {
 433                 handler = ptr;
 434             }
 435             eventMask |= ptr->eventMask;
 436
 437             ptr = ptr->nextHandler;
 438         }
 439         if (!handler) {
 440             handler = wmalloc(sizeof(W_EventHandler));
 441             handler->nextHandler = view->handlerList;
 442             view->handlerList = handler;
 443         }
 444     }
 445
 446     /* select events for window */
 447     handler->eventMask = mask;
 448     handler->proc = eventProc;
 449     handler->clientData = clientData;
 450 }
 451
 452
 453 /*
 454  * WMDeleteEventHandler--
 455  *      Delete event handler matching arguments from windows
 456  * event handler list.
 457  *
 458  */
 459 void
 460 WMDeleteEventHandler(WMView *view, unsigned long mask, WMEventProc *eventProc,
 461                      void *clientData)
 462 {
 463     W_EventHandler *handler, *ptr, *pptr;
 464
 465     ptr = view->handlerList;
 466
 467     handler = NULL;
 468     pptr = NULL;
 469
 470     while (ptr!=NULL) {
 471         if (ptr->eventMask == mask && ptr->proc == eventProc
 472             && ptr->clientData == clientData) {
 473             handler = ptr;
 474             break;
 475         }
 476         pptr = ptr;
 477         ptr = ptr->nextHandler;
 478     }
 479
 480     if (!handler)
 481         return;
 482
 483     if (!pptr) {
 484         view->handlerList = handler->nextHandler;
 485     } else {
 486         pptr->nextHandler = handler->nextHandler;
 487     }
 488     free(handler);
 489 }
 490
 491
 492
 493 void
 494 W_CleanUpEvents(WMView *view)
 495 {
 496     W_EventHandler *ptr, *nptr;
 497
 498     ptr = view->handlerList;
 499
 500     while (ptr!=NULL) {
 501         nptr = ptr->nextHandler;
 502         free(ptr);
 503         ptr = nptr;
 504     }
 505 }
 506
 507
 508
 509 static Time
 510 getEventTime(WMScreen *screen, XEvent *event)
 511 {
 512     switch (event->type) {
 513      case ButtonPress:
 514      case ButtonRelease:
 515         return event->xbutton.time;
 516      case KeyPress:
 517      case KeyRelease:
 518         return event->xkey.time;
 519      case MotionNotify:
 520         return event->xmotion.time;
 521      case EnterNotify:
 522      case LeaveNotify:
 523         return event->xcrossing.time;
 524      case PropertyNotify:
 525         return event->xproperty.time;
 526      case SelectionClear:
 527         return event->xselectionclear.time;
 528      case SelectionRequest:
 529         return event->xselectionrequest.time;
 530      case SelectionNotify:
 531         return event->xselection.time;
 532      default:
 533         return screen->lastEventTime;
 534     }
 535 }
 536
 537
 538 void
 539 W_CallDestroyHandlers(W_View *view)
 540 {
 541     XEvent event;
 542     W_EventHandler *hPtr;
 543
 544     event.type = DestroyNotify;
 545     event.xdestroywindow.window = view->window;
 546     event.xdestroywindow.event = view->window;
 547     hPtr = view->handlerList;
 548     while (hPtr!=NULL) {
 549         if (hPtr->eventMask & StructureNotifyMask) {
 550             (*hPtr->proc)(&event, hPtr->clientData);
 551         }
 552
 553         hPtr = hPtr->nextHandler;
 554     }
 555 }
 556
 557
 558 int
 559 WMHandleEvent(XEvent *event)
 560 {
 561     W_EventHandler *hPtr;
 562     W_View *view, *vPtr, *toplevel;
 563     unsigned long mask;
 564     Window window;
 565
 566     if (event->type == MappingNotify) {
 567         XRefreshKeyboardMapping(&event->xmapping);
 568         return True;
 569     }
 570
 571     mask = eventMasks[event->xany.type];
 572
 573     window = event->xany.window;
 574
 575     /* diferentiate SubstructureNotify with StructureNotify */
 576     if (mask == StructureNotifyMask) {
 577         if (event->xmap.event != event->xmap.window) {
 578             mask = SubstructureNotifyMask;
 579             window = event->xmap.event;
 580         }
 581     }
 582     view = W_GetViewForXWindow(event->xany.display, window);
 583     if (!view) {
 584         if (extraEventHandler)
 585             (extraEventHandler)(event);
 586
 587         return False;
 588     }
 589
 590     view->screen->lastEventTime = getEventTime(view->screen, event);
 591
 592     toplevel = W_TopLevelOfView(view);
 593
 594     if (event->type == SelectionNotify || event->type == SelectionClear
 595         || event->type == SelectionRequest) {
 596         /* handle selection related events */
 597         W_HandleSelectionEvent(event);
 598     }
 599
 600     /* if it's a key event, redispatch it to the focused control */
 601     if (mask & (KeyPressMask|KeyReleaseMask)) {
 602         W_View *focused = W_FocusedViewOfToplevel(toplevel);
 603
 604         if (focused) {
 605             view = focused;
 606         }
 607     }
 608
 609     /* compress Motion events */
 610     if (event->type == MotionNotify && !view->flags.dontCompressMotion) {
 611         while (XPending(event->xmotion.display)) {
 612             XEvent ev;
 613             XPeekEvent(event->xmotion.display, &ev);
 614             if (ev.type == MotionNotify
 615                 && event->xmotion.window == ev.xmotion.window
 616                 && event->xmotion.subwindow == ev.xmotion.subwindow) {
 617                 /* replace events */
 618                 XNextEvent(event->xmotion.display, event);
 619             } else break;
 620         }
 621     }
 622
 623     /* compress expose events */
 624     if (event->type == Expose && !view->flags.dontCompressExpose) {
 625         while (XCheckTypedWindowEvent(event->xexpose.display, view->window,
 626                                       Expose, event));
 627     }
 628
 629
 630     if (view->screen->modal && toplevel!=view->screen->modalView
 631         && !toplevel->flags.worksWhenModal) {
 632         if (event->type == KeyPress || event->type == KeyRelease
 633             || event->type == MotionNotify || event->type == ButtonPress
 634             || event->type == ButtonRelease
 635             || event->type == FocusIn || event->type == FocusOut) {
 636             return True;
 637         }
 638     }
 639
 640     /* do balloon stuffs */
 641     if (event->type == EnterNotify)
 642         W_BalloonHandleEnterView(view);
 643     else if (event->type == LeaveNotify)
 644         W_BalloonHandleLeaveView(view);
 645
 646     /* This is a hack. It will make the panel be secure while
 647      * the event handlers are handled, as some event handler
 648      * might destroy the widget. */
 649     W_RetainView(toplevel);
 650
 651     hPtr = view->handlerList;
 652
 653     while (hPtr!=NULL) {
 654         W_EventHandler *tmp;
 655
 656         tmp = hPtr->nextHandler;
 657
 658         if ((hPtr->eventMask & mask)) {
 659             (*hPtr->proc)(event, hPtr->clientData);
 660         }
 661
 662         hPtr = tmp;
 663     }
 664
 665     /* pass the event to the top level window of the widget */
 666     if (view->parent!=NULL) {
 667         vPtr = view;
 668         while (vPtr->parent!=NULL)
 669             vPtr = vPtr->parent;
 670
 671         hPtr = vPtr->handlerList;
 672
 673         while (hPtr!=NULL) {
 674
 675             if (hPtr->eventMask & mask) {
 676                 (*hPtr->proc)(event, hPtr->clientData);
 677             }
 678             hPtr = hPtr->nextHandler;
 679         }
 680     }
 681
 682     /* save button click info to track double-clicks */
 683     if (view->screen->ignoreNextDoubleClick) {
 684         view->screen->ignoreNextDoubleClick = 0;
 685     } else {
 686         if (event->type == ButtonPress) {
 687             view->screen->lastClickWindow = event->xbutton.window;
 688             view->screen->lastClickTime = event->xbutton.time;
 689         }
 690     }
 691
 692     W_ReleaseView(toplevel);
 693
 694     return True;
 695 }
 696
 697
 698 int
 699 WMIsDoubleClick(XEvent *event)
 700 {
 701     W_View *view;
 702
 703     if (event->type != ButtonPress)
 704         return False;
 705
 706     view = W_GetViewForXWindow(event->xany.display, event->xbutton.window);
 707
 708     if (!view)
 709         return False;
 710
 711     if (view->screen->lastClickWindow != event->xbutton.window)
 712         return False;
 713
 714     if (event->xbutton.time - view->screen->lastClickTime
 715         < WINGsConfiguration.doubleClickDelay) {
 716         view->screen->lastClickTime = 0;
 717         view->screen->lastClickWindow = None;
 718         view->screen->ignoreNextDoubleClick = 1;
 719         return True;
 720     } else
 721         return False;
 722 }
 723
 724
 725 Bool
 726 W_WaitForEvent(Display *dpy, unsigned long xeventmask)
 727 {
 728 #if defined(HAVE_POLL) && defined(HAVE_POLL_H) && !defined(HAVE_SELECT)
 729     struct pollfd *fds;
 730     InputHandler *handler;
 731     int count, timeout, nfds, k, retval;
 732
 733     for (nfds = 1, handler = inputHandler;
 734          handler != 0; handler = handler->next) nfds++;
 735
 736     fds = wmalloc(nfds * sizeof(struct pollfd));
 737     fds[0].fd = ConnectionNumber(dpy);
 738     fds[0].events = POLLIN;
 739
 740     for (k = 1, handler = inputHandler;
 741          handler;
 742          handler = handler->next, k++) {
 743         fds[k].fd = handler->fd;
 744         fds[k].events = 0;
 745         if (handler->mask & WIReadMask)
 746             fds[k].events |= POLLIN;
 747
 748         if (handler->mask & WIWriteMask)
 749             fds[k].events |= POLLOUT;
 750
 751 #if 0 /* FIXME */
 752         if (handler->mask & WIExceptMask)
 753             FD_SET(handler->fd, &eset);
 754 #endif
 755     }
 756
 757     /*
 758      * Setup the select() timeout to the estimated time until the
 759      * next timer expires.
 760      */
 761     if (timerPending()) {
 762         struct timeval tv;
 763         delayUntilNextTimerEvent(&tv);
 764         timeout = tv.tv_sec * 1000 + tv.tv_usec / 1000;
 765     } else {
 766         timeout = -1;
 767     }
 768
 769     if (xeventmask==0) {
 770         if (XPending(dpy))
 771             return True;
 772     } else {
 773         XEvent ev;
 774         if (XCheckMaskEvent(dpy, xeventmask, &ev)) {
 775             XPutBackEvent(dpy, &ev);
 776             return True;
 777         }
 778     }
 779
 780     count = poll(fds, nfds, timeout);
 781
 782     if (count > 0) {
 783         handler = inputHandler;
 784         k = 1;
 785         while (handler) {
 786             int mask;
 787
 788             mask = 0;
 789
 790             if (fds[k].revents & (POLLIN|POLLRDNORM|POLLRDBAND|POLLPRI))
 791                 mask |= WIReadMask;
 792
 793             if (fds[k].revents & (POLLOUT | POLLWRBAND))
 794                 mask |= WIWriteMask;
 795
 796             if (fds[k].revents & (POLLHUP | POLLNVAL | POLLERR))
 797                 mask |= WIExceptMask;
 798
 799             if (mask!=0 && handler->callback) {
 800                 (*handler->callback)(handler->fd, mask,
 801                                      handler->clientData);
 802             }
 803
 804             handler = handler->next;
 805             k++;
 806         }
 807     }
 808
 809     retval = fds[0].revents & (POLLIN|POLLRDNORM|POLLRDBAND|POLLPRI);
 810     free(fds);
 811
 812     W_FlushASAPNotificationQueue();
 813
 814     return retval;
 815 #else /* not HAVE_POLL */
 816 #ifdef HAVE_SELECT
 817     struct timeval timeout;
 818     struct timeval *timeoutPtr;
 819     fd_set rset, wset, eset;
 820     int maxfd;
 821     int count;
 822     InputHandler *handler = inputHandler;
 823
 824     FD_ZERO(&rset);
 825     FD_ZERO(&wset);
 826     FD_ZERO(&eset);
 827
 828     FD_SET(ConnectionNumber(dpy), &rset);
 829     maxfd = ConnectionNumber(dpy);
 830
 831     while (handler) {
 832         if (handler->mask & WIReadMask)
 833             FD_SET(handler->fd, &rset);
 834
 835         if (handler->mask & WIWriteMask)
 836             FD_SET(handler->fd, &wset);
 837
 838         if (handler->mask & WIExceptMask)
 839             FD_SET(handler->fd, &eset);
 840
 841         if (maxfd < handler->fd)
 842             maxfd = handler->fd;
 843
 844         handler = handler->next;
 845     }
 846
 847
 848     /*
 849      * Setup the select() timeout to the estimated time until the
 850      * next timer expires.
 851      */
 852     if (timerPending()) {
 853         delayUntilNextTimerEvent(&timeout);
 854         timeoutPtr = &timeout;
 855     } else {
 856         timeoutPtr = (struct timeval*)0;
 857     }
 858
 859     XSync(dpy, False);
 860     if (xeventmask==0) {
 861         if (XPending(dpy))
 862             return True;
 863     } else {
 864         XEvent ev;
 865         if (XCheckMaskEvent(dpy, xeventmask, &ev)) {
 866             XPutBackEvent(dpy, &ev);
 867             return True;
 868         }
 869     }
 870
 871     count = select(1 + maxfd, &rset, &wset, &eset, timeoutPtr);
 872
 873     if (count > 0) {
 874         handler = inputHandler;
 875
 876         while (handler) {
 877             int mask;
 878
 879             mask = 0;
 880
 881             if (FD_ISSET(handler->fd, &rset))
 882                 mask |= WIReadMask;
 883
 884             if (FD_ISSET(handler->fd, &wset))
 885                 mask |= WIWriteMask;
 886
 887             if (FD_ISSET(handler->fd, &eset))
 888                 mask |= WIExceptMask;
 889
 890             if (mask!=0 && handler->callback) {
 891                 (*handler->callback)(handler->fd, mask,
 892                                      handler->clientData);
 893             }
 894
 895             handler = handler->next;
 896         }
 897     }
 898
 899     W_FlushASAPNotificationQueue();
 900
 901     return FD_ISSET(ConnectionNumber(dpy), &rset);
 902 #else /* not HAVE_SELECT, not HAVE_POLL */
 903 Neither select nor poll. You lose.
 904 #endif /* HAVE_SELECT */
 905 #endif /* HAVE_POLL */
 906 }
 907
 908
 909 void
 910 WMNextEvent(Display *dpy, XEvent *event)
 911 {
 912     /* Check any expired timers */
 913     if (timerPending()) {
 914         checkTimerHandlers();
 915     }
 916
 917     while (XPending(dpy) == 0) {
 918         /* Do idle stuff */
 919         /* Do idle and timer stuff while there are no timer or X events */
 920         while (!XPending(dpy) && idlePending()) {
 921             if (idlePending())
 922                 checkIdleHandlers();
 923             /* dispatch timer events */
 924             if (timerPending())
 925                 checkTimerHandlers();
 926         }
 927
 928         /*
 929          * Make sure that new events did not arrive while we were doing
 930          * timer/idle stuff. Or we might block forever waiting for
 931          * an event that already arrived.
 932          */
 933         /* wait to something happen */
 934         W_WaitForEvent(dpy, 0);
 935
 936         /* Check any expired timers */
 937         if (timerPending()) {
 938             checkTimerHandlers();
 939         }
 940     }
 941
 942     XNextEvent(dpy, event);
 943 }
 944
 945 #if 0
 946 void
 947 WMMaskEvent(Display *dpy, long mask, XEvent *event)
 948 {
 949     unsigned long milliseconds;
 950     struct timeval timeout;
 951     struct timeval *timeoutOrInfty;
 952     fd_set readset;
 953
 954     while (!XCheckMaskEvent(dpy, mask, event)) {
 955         /* Do idle stuff while there are no timer or X events */
 956         while (idlePending()) {
 957             checkIdleHandlers();
 958             if (XCheckMaskEvent(dpy, mask, event))
 959                 return;
 960         }
 961
 962         /*
 963          * Setup the select() timeout to the estimated time until the
 964          * next timer expires.
 965          */
 966         if (timerPending()) {
 967             delayUntilNextTimerEvent(&timeout);
 968             timeoutOrInfty = &timeout;
 969         } else {
 970             timeoutOrInfty = (struct timeval*)0;
 971         }
 972
 973         if (XCheckMaskEvent(dpy, mask, event))
 974             return;
 975
 976         /* Wait for input on the X connection socket */
 977         FD_ZERO(&readset);
 978         FD_SET(ConnectionNumber(dpy), &readset);
 979         select(1 + ConnectionNumber(dpy), &readset, (fd_set*)0, (fd_set*)0,
 980                timeoutOrInfty);
 981
 982         /* Check any expired timers */
 983         if (timerPending()) {
 984             checkTimerHandlers();
 985         }
 986     }
 987 }
 988 #endif
 989 #if 1
 990 /*
 991  * Cant use this because XPending() will make W_WaitForEvent
 992  * return even if the event in the queue is not what we want,
 993  * and if we block until some new event arrives from the
 994  * server, other events already in the queue (like Expose)
 995  * will be deferred.
 996  */
 997 void
 998 WMMaskEvent(Display *dpy, long mask, XEvent *event)
 999 {
1000     while (!XCheckMaskEvent(dpy, mask, event)) {
1001         /* Do idle stuff while there are no timer or X events */
1002         while (idlePending()) {
1003             checkIdleHandlers();
1004             if (XCheckMaskEvent(dpy, mask, event))
1005                 return;
1006         }
1007
1008         /* Wait for input on the X connection socket */
1009         W_WaitForEvent(dpy, mask);
1010
1011         /* Check any expired timers */
1012         if (timerPending()) {
1013             checkTimerHandlers();
1014         }
1015     }
1016 }
1017 #endif
1018
1019 Bool
1020 WMScreenPending(WMScreen *scr)
1021 {
1022     if (XPending(scr->display))
1023         return True;
1024     else
1025         return False;
1026 }
1027
1028
1029 WMEventHook*
1030 WMHookEventHandler(WMEventHook *handler)
1031 {
1032     WMEventHook *oldHandler = extraEventHandler;
1033
1034     extraEventHandler = handler;
1035
1036     return oldHandler;
1037 }
1038
1039