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     /* This is a hack. It will make the panel be secure while
 641      * the event handlers are handled, as some event handler
 642      * might destroy the widget. */
 643     W_RetainView(toplevel);
 644
 645     hPtr = view->handlerList;
 646
 647     while (hPtr!=NULL) {
 648         W_EventHandler *tmp;
 649
 650         tmp = hPtr->nextHandler;
 651
 652         if ((hPtr->eventMask & mask)) {
 653             (*hPtr->proc)(event, hPtr->clientData);
 654         }
 655
 656         hPtr = tmp;
 657     }
 658
 659     /* pass the event to the top level window of the widget */
 660     if (view->parent!=NULL) {
 661         vPtr = view;
 662         while (vPtr->parent!=NULL)
 663             vPtr = vPtr->parent;
 664
 665         hPtr = vPtr->handlerList;
 666
 667         while (hPtr!=NULL) {
 668
 669             if (hPtr->eventMask & mask) {
 670                 (*hPtr->proc)(event, hPtr->clientData);
 671             }
 672             hPtr = hPtr->nextHandler;
 673         }
 674     }
 675
 676     /* save button click info to track double-clicks */
 677     if (view->screen->ignoreNextDoubleClick) {
 678         view->screen->ignoreNextDoubleClick = 0;
 679     } else {
 680         if (event->type == ButtonPress) {
 681             view->screen->lastClickWindow = event->xbutton.window;
 682             view->screen->lastClickTime = event->xbutton.time;
 683         }
 684     }
 685
 686     W_ReleaseView(toplevel);
 687
 688     return True;
 689 }
 690
 691
 692 int
 693 WMIsDoubleClick(XEvent *event)
 694 {
 695     W_View *view;
 696
 697     if (event->type != ButtonPress)
 698         return False;
 699
 700     view = W_GetViewForXWindow(event->xany.display, event->xbutton.window);
 701
 702     if (!view)
 703         return False;
 704
 705     if (view->screen->lastClickWindow != event->xbutton.window)
 706         return False;
 707
 708     if (event->xbutton.time - view->screen->lastClickTime
 709         < WINGsConfiguration.doubleClickDelay) {
 710         view->screen->lastClickTime = 0;
 711         view->screen->lastClickWindow = None;
 712         view->screen->ignoreNextDoubleClick = 1;
 713         return True;
 714     } else
 715         return False;
 716 }
 717
 718
 719 Bool
 720 W_WaitForEvent(Display *dpy, unsigned long xeventmask)
 721 {
 722 #if defined(HAVE_POLL) && defined(HAVE_POLL_H) && !defined(HAVE_SELECT)
 723     struct pollfd *fds;
 724     InputHandler *handler;
 725     int count, timeout, nfds, k, retval;
 726
 727     for (nfds = 1, handler = inputHandler;
 728          handler != 0; handler = handler->next) nfds++;
 729
 730     fds = wmalloc(nfds * sizeof(struct pollfd));
 731     fds[0].fd = ConnectionNumber(dpy);
 732     fds[0].events = POLLIN;
 733
 734     for (k = 1, handler = inputHandler;
 735          handler;
 736          handler = handler->next, k++) {
 737         fds[k].fd = handler->fd;
 738         fds[k].events = 0;
 739         if (handler->mask & WIReadMask)
 740             fds[k].events |= POLLIN;
 741
 742         if (handler->mask & WIWriteMask)
 743             fds[k].events |= POLLOUT;
 744
 745 #if 0 /* FIXME */
 746         if (handler->mask & WIExceptMask)
 747             FD_SET(handler->fd, &eset);
 748 #endif
 749     }
 750
 751     /*
 752      * Setup the select() timeout to the estimated time until the
 753      * next timer expires.
 754      */
 755     if (timerPending()) {
 756         struct timeval tv;
 757         delayUntilNextTimerEvent(&tv);
 758         timeout = tv.tv_sec * 1000 + tv.tv_usec / 1000;
 759     } else {
 760         timeout = -1;
 761     }
 762
 763     if (xeventmask==0) {
 764         if (XPending(dpy))
 765             return True;
 766     } else {
 767         XEvent ev;
 768         if (XCheckMaskEvent(dpy, xeventmask, &ev)) {
 769             XPutBackEvent(dpy, &ev);
 770             return True;
 771         }
 772     }
 773
 774     count = poll(fds, nfds, timeout);
 775
 776     if (count > 0) {
 777         handler = inputHandler;
 778         k = 1;
 779         while (handler) {
 780             int mask;
 781
 782             mask = 0;
 783
 784             if (fds[k].revents & (POLLIN|POLLRDNORM|POLLRDBAND|POLLPRI))
 785                 mask |= WIReadMask;
 786
 787             if (fds[k].revents & (POLLOUT | POLLWRBAND))
 788                 mask |= WIWriteMask;
 789
 790             if (fds[k].revents & (POLLHUP | POLLNVAL | POLLERR))
 791                 mask |= WIExceptMask;
 792
 793             if (mask!=0 && handler->callback) {
 794                 (*handler->callback)(handler->fd, mask,
 795                                      handler->clientData);
 796             }
 797
 798             handler = handler->next;
 799             k++;
 800         }
 801     }
 802
 803     retval = fds[0].revents & (POLLIN|POLLRDNORM|POLLRDBAND|POLLPRI);
 804     free(fds);
 805
 806     W_FlushASAPNotificationQueue();
 807
 808     return retval;
 809 #else /* not HAVE_POLL */
 810 #ifdef HAVE_SELECT
 811     struct timeval timeout;
 812     struct timeval *timeoutPtr;
 813     fd_set rset, wset, eset;
 814     int maxfd;
 815     int count;
 816     InputHandler *handler = inputHandler;
 817
 818     FD_ZERO(&rset);
 819     FD_ZERO(&wset);
 820     FD_ZERO(&eset);
 821
 822     FD_SET(ConnectionNumber(dpy), &rset);
 823     maxfd = ConnectionNumber(dpy);
 824
 825     while (handler) {
 826         if (handler->mask & WIReadMask)
 827             FD_SET(handler->fd, &rset);
 828
 829         if (handler->mask & WIWriteMask)
 830             FD_SET(handler->fd, &wset);
 831
 832         if (handler->mask & WIExceptMask)
 833             FD_SET(handler->fd, &eset);
 834
 835         if (maxfd < handler->fd)
 836             maxfd = handler->fd;
 837
 838         handler = handler->next;
 839     }
 840
 841
 842     /*
 843      * Setup the select() timeout to the estimated time until the
 844      * next timer expires.
 845      */
 846     if (timerPending()) {
 847         delayUntilNextTimerEvent(&timeout);
 848         timeoutPtr = &timeout;
 849     } else {
 850         timeoutPtr = (struct timeval*)0;
 851     }
 852
 853     XSync(dpy, False);
 854     if (xeventmask==0) {
 855         if (XPending(dpy))
 856             return True;
 857     } else {
 858         XEvent ev;
 859         if (XCheckMaskEvent(dpy, xeventmask, &ev)) {
 860             XPutBackEvent(dpy, &ev);
 861             return True;
 862         }
 863     }
 864
 865     count = select(1 + maxfd, &rset, &wset, &eset, timeoutPtr);
 866
 867     if (count > 0) {
 868         handler = inputHandler;
 869
 870         while (handler) {
 871             int mask;
 872
 873             mask = 0;
 874
 875             if (FD_ISSET(handler->fd, &rset))
 876                 mask |= WIReadMask;
 877
 878             if (FD_ISSET(handler->fd, &wset))
 879                 mask |= WIWriteMask;
 880
 881             if (FD_ISSET(handler->fd, &eset))
 882                 mask |= WIExceptMask;
 883
 884             if (mask!=0 && handler->callback) {
 885                 (*handler->callback)(handler->fd, mask,
 886                                      handler->clientData);
 887             }
 888
 889             handler = handler->next;
 890         }
 891     }
 892
 893     W_FlushASAPNotificationQueue();
 894
 895     return FD_ISSET(ConnectionNumber(dpy), &rset);
 896 #else /* not HAVE_SELECT, not HAVE_POLL */
 897 Neither select nor poll. You lose.
 898 #endif /* HAVE_SELECT */
 899 #endif /* HAVE_POLL */
 900 }
 901
 902
 903 void
 904 WMNextEvent(Display *dpy, XEvent *event)
 905 {
 906     /* Check any expired timers */
 907     if (timerPending()) {
 908         checkTimerHandlers();
 909     }
 910
 911     while (XPending(dpy) == 0) {
 912         /* Do idle stuff */
 913         /* Do idle and timer stuff while there are no timer or X events */
 914         while (!XPending(dpy) && idlePending()) {
 915             if (idlePending())
 916                 checkIdleHandlers();
 917             /* dispatch timer events */
 918             if (timerPending())
 919                 checkTimerHandlers();
 920         }
 921
 922         /*
 923          * Make sure that new events did not arrive while we were doing
 924          * timer/idle stuff. Or we might block forever waiting for
 925          * an event that already arrived.
 926          */
 927         /* wait to something happen */
 928         W_WaitForEvent(dpy, 0);
 929
 930         /* Check any expired timers */
 931         if (timerPending()) {
 932             checkTimerHandlers();
 933         }
 934     }
 935
 936     XNextEvent(dpy, event);
 937 }
 938
 939 #if 0
 940 void
 941 WMMaskEvent(Display *dpy, long mask, XEvent *event)
 942 {
 943     unsigned long milliseconds;
 944     struct timeval timeout;
 945     struct timeval *timeoutOrInfty;
 946     fd_set readset;
 947
 948     while (!XCheckMaskEvent(dpy, mask, event)) {
 949         /* Do idle stuff while there are no timer or X events */
 950         while (idlePending()) {
 951             checkIdleHandlers();
 952             if (XCheckMaskEvent(dpy, mask, event))
 953                 return;
 954         }
 955
 956         /*
 957          * Setup the select() timeout to the estimated time until the
 958          * next timer expires.
 959          */
 960         if (timerPending()) {
 961             delayUntilNextTimerEvent(&timeout);
 962             timeoutOrInfty = &timeout;
 963         } else {
 964             timeoutOrInfty = (struct timeval*)0;
 965         }
 966
 967         if (XCheckMaskEvent(dpy, mask, event))
 968             return;
 969
 970         /* Wait for input on the X connection socket */
 971         FD_ZERO(&readset);
 972         FD_SET(ConnectionNumber(dpy), &readset);
 973         select(1 + ConnectionNumber(dpy), &readset, (fd_set*)0, (fd_set*)0,
 974                timeoutOrInfty);
 975
 976         /* Check any expired timers */
 977         if (timerPending()) {
 978             checkTimerHandlers();
 979         }
 980     }
 981 }
 982 #endif
 983 #if 1
 984 /*
 985  * Cant use this because XPending() will make W_WaitForEvent
 986  * return even if the event in the queue is not what we want,
 987  * and if we block until some new event arrives from the
 988  * server, other events already in the queue (like Expose)
 989  * will be deferred.
 990  */
 991 void
 992 WMMaskEvent(Display *dpy, long mask, XEvent *event)
 993 {
 994     while (!XCheckMaskEvent(dpy, mask, event)) {
 995         /* Do idle stuff while there are no timer or X events */
 996         while (idlePending()) {
 997             checkIdleHandlers();
 998             if (XCheckMaskEvent(dpy, mask, event))
 999                 return;
1000         }
1001
1002         /* Wait for input on the X connection socket */
1003         W_WaitForEvent(dpy, mask);
1004
1005         /* Check any expired timers */
1006         if (timerPending()) {
1007             checkTimerHandlers();
1008         }
1009     }
1010 }
1011 #endif
1012
1013 Bool
1014 WMScreenPending(WMScreen *scr)
1015 {
1016     if (XPending(scr->display))
1017         return True;
1018     else
1019         return False;
1020 }
1021
1022
1023 WMEventHook*
1024 WMHookEventHandler(WMEventHook *handler)
1025 {
1026     WMEventHook *oldHandler = extraEventHandler;
1027
1028     extraEventHandler = handler;
1029
1030     return oldHandler;
1031 }
1032
1033