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     int                 nextDelay;             /* 0 if it's one-shot */
  42 } TimerHandler;
  43
  44
  45 typedef struct IdleHandler {
  46     WMCallback          *callback;
  47     void                *clientData;
  48 } IdleHandler;
  49
  50
  51 typedef struct InputHandler {
  52     WMInputProc         *callback;
  53     void                *clientData;
  54     int                 fd;
  55     int                 mask;
  56 } InputHandler;
  57
  58
  59 /* table to map event types to event masks */
  60 static unsigned long eventMasks[] = {
  61     0,
  62     0,
  63     KeyPressMask,                       /* KeyPress */
  64     KeyReleaseMask,                     /* KeyRelease */
  65     ButtonPressMask,                    /* ButtonPress */
  66     ButtonReleaseMask,                  /* ButtonRelease */
  67     PointerMotionMask|PointerMotionHintMask|ButtonMotionMask
  68             |Button1MotionMask|Button2MotionMask|Button3MotionMask
  69             |Button4MotionMask|Button5MotionMask,
  70                                         /* MotionNotify */
  71     EnterWindowMask,                    /* EnterNotify */
  72     LeaveWindowMask,                    /* LeaveNotify */
  73     FocusChangeMask,                    /* FocusIn */
  74     FocusChangeMask,                    /* FocusOut */
  75     KeymapStateMask,                    /* KeymapNotify */
  76     ExposureMask,                       /* Expose */
  77     ExposureMask,                       /* GraphicsExpose */
  78     ExposureMask,                       /* NoExpose */
  79     VisibilityChangeMask,               /* VisibilityNotify */
  80     SubstructureNotifyMask,             /* CreateNotify */
  81     StructureNotifyMask,                /* DestroyNotify */
  82     StructureNotifyMask,                /* UnmapNotify */
  83     StructureNotifyMask,                /* MapNotify */
  84     SubstructureRedirectMask,           /* MapRequest */
  85     StructureNotifyMask,                /* ReparentNotify */
  86     StructureNotifyMask,                /* ConfigureNotify */
  87     SubstructureRedirectMask,           /* ConfigureRequest */
  88     StructureNotifyMask,                /* GravityNotify */
  89     ResizeRedirectMask,                 /* ResizeRequest */
  90     StructureNotifyMask,                /* CirculateNotify */
  91     SubstructureRedirectMask,           /* CirculateRequest */
  92     PropertyChangeMask,                 /* PropertyNotify */
  93     0,                                  /* SelectionClear */
  94     0,                                  /* SelectionRequest */
  95     0,                                  /* SelectionNotify */
  96     ColormapChangeMask,                 /* ColormapNotify */
  97     ClientMessageMask,                  /* ClientMessage */
  98     0,                                  /* Mapping Notify */
  99 };
 100
 101
 102
 103 /* queue of timer event handlers */
 104 static TimerHandler *timerHandler=NULL;
 105
 106 static WMBag *idleHandler=NULL;
 107
 108 static WMBag *inputHandler=NULL;
 109
 110 /* hook for other toolkits or wmaker process their events */
 111 static WMEventHook *extraEventHandler=NULL;
 112
 113
 114
 115 #define timerPending()  (timerHandler)
 116
 117
 118
 119 static void
 120 rightNow(struct timeval *tv) {
 121     X_GETTIMEOFDAY(tv);
 122 }
 123
 124 /* is t1 after t2 ? */
 125 #define IS_AFTER(t1, t2)        (((t1).tv_sec > (t2).tv_sec) || \
 126                                  (((t1).tv_sec == (t2).tv_sec) \
 127                                   && ((t1).tv_usec > (t2).tv_usec)))
 128
 129 #define IS_ZERO(tv) (tv.tv_sec == 0 && tv.tv_usec == 0)
 130
 131 #define SET_ZERO(tv) tv.tv_sec = 0, tv.tv_usec = 0
 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 static void
 144 enqueueTimerHandler(TimerHandler *handler)
 145 {
 146     TimerHandler *tmp;
 147
 148     /* insert callback in queue, sorted by time left */
 149     if (!timerHandler || !IS_AFTER(handler->when, timerHandler->when)) {
 150         /* first in the queue */
 151         handler->next = timerHandler;
 152         timerHandler = handler;
 153     } else {
 154         tmp = timerHandler;
 155         while (tmp->next && IS_AFTER(handler->when, tmp->next->when)) {
 156             tmp = tmp->next;
 157         }
 158         handler->next = tmp->next;
 159         tmp->next = handler;
 160     }
 161 }
 162
 163
 164 WMHandlerID
 165 WMAddTimerHandler(int milliseconds, WMCallback *callback, void *cdata)
 166 {
 167     TimerHandler *handler;
 168
 169     handler = malloc(sizeof(TimerHandler));
 170     if (!handler)
 171       return NULL;
 172
 173     rightNow(&handler->when);
 174     addmillisecs(&handler->when, milliseconds);
 175     handler->callback = callback;
 176     handler->clientData = cdata;
 177     handler->nextDelay = 0;
 178
 179     enqueueTimerHandler(handler);
 180
 181     return handler;
 182 }
 183
 184
 185 WMHandlerID
 186 WMAddEternalTimerHandler(int milliseconds, WMCallback *callback, void *cdata)
 187 {
 188     TimerHandler *handler = WMAddTimerHandler(milliseconds, callback, cdata);
 189
 190     if (handler != NULL)
 191         handler->nextDelay = milliseconds;
 192
 193     return handler;
 194 }
 195
 196
 197
 198 void
 199 WMDeleteTimerWithClientData(void *cdata)
 200 {
 201     TimerHandler *handler, *tmp;
 202
 203     if (!cdata || !timerHandler)
 204         return;
 205
 206     tmp = timerHandler;
 207     if (tmp->clientData==cdata) {
 208         tmp->nextDelay = 0;
 209         if (!IS_ZERO(tmp->when)) {
 210             timerHandler = tmp->next;
 211             wfree(tmp);
 212         }
 213     } else {
 214         while (tmp->next) {
 215             if (tmp->next->clientData==cdata) {
 216                 handler = tmp->next;
 217                 handler->nextDelay = 0;
 218                 if (IS_ZERO(handler->when))
 219                     break;
 220                 tmp->next = handler->next;
 221                 wfree(handler);
 222                 break;
 223             }
 224             tmp = tmp->next;
 225         }
 226     }
 227 }
 228
 229
 230
 231 void
 232 WMDeleteTimerHandler(WMHandlerID handlerID)
 233 {
 234     TimerHandler *tmp, *handler=(TimerHandler*)handlerID;
 235
 236     if (!handler || !timerHandler)
 237       return;
 238
 239     tmp = timerHandler;
 240
 241     handler->nextDelay = 0;
 242
 243     if (IS_ZERO(handler->when))
 244         return;
 245
 246     if (tmp==handler) {
 247         timerHandler = handler->next;
 248         wfree(handler);
 249     } else {
 250         while (tmp->next) {
 251             if (tmp->next==handler) {
 252                 tmp->next=handler->next;
 253                 wfree(handler);
 254                 break;
 255             }
 256             tmp = tmp->next;
 257         }
 258     }
 259 }
 260
 261
 262
 263 WMHandlerID
 264 WMAddIdleHandler(WMCallback *callback, void *cdata)
 265 {
 266     IdleHandler *handler;
 267
 268     handler = malloc(sizeof(IdleHandler));
 269     if (!handler)
 270         return NULL;
 271
 272     handler->callback = callback;
 273     handler->clientData = cdata;
 274     /* add handler at end of queue */
 275     if (!idleHandler) {
 276         idleHandler = WMCreateBag(16);
 277     }
 278     WMPutInBag(idleHandler, handler);
 279
 280     return handler;
 281 }
 282
 283
 284 void
 285 WMDeleteIdleHandler(WMHandlerID handlerID)
 286 {
 287     IdleHandler *handler = (IdleHandler*)handlerID;
 288     int pos;
 289
 290     if (!handler || !idleHandler)
 291         return;
 292
 293     pos = WMGetFirstInBag(idleHandler, handler);
 294     if (pos != WBNotFound) {
 295         wfree(handler);
 296         WMDeleteFromBag(idleHandler, pos);
 297     }
 298 }
 299
 300
 301
 302 WMHandlerID
 303 WMAddInputHandler(int fd, int condition, WMInputProc *proc, void *clientData)
 304 {
 305     InputHandler *handler;
 306
 307     handler = wmalloc(sizeof(InputHandler));
 308
 309     handler->fd = fd;
 310     handler->mask = condition;
 311     handler->callback = proc;
 312     handler->clientData = clientData;
 313
 314     if (!inputHandler)
 315         inputHandler = WMCreateBag(16);
 316     WMPutInBag(inputHandler, handler);
 317
 318     return handler;
 319 }
 320
 321
 322
 323 void
 324 WMDeleteInputHandler(WMHandlerID handlerID)
 325 {
 326     InputHandler *handler = (InputHandler*)handlerID;
 327     int pos;
 328
 329     if (!handler || !inputHandler)
 330         return;
 331
 332     pos = WMGetFirstInBag(inputHandler, handler);
 333     if (pos != WBNotFound) {
 334         wfree(handler);
 335         WMDeleteFromBag(inputHandler, pos);
 336     }
 337 }
 338
 339
 340
 341 static Bool
 342 checkIdleHandlers()
 343 {
 344     IdleHandler *handler;
 345     WMBag *handlerCopy;
 346     WMBagIterator iter;
 347
 348
 349     if (!idleHandler || WMGetBagItemCount(idleHandler)==0) {
 350         W_FlushIdleNotificationQueue();
 351         /* make sure an observer in queue didn't added an idle handler */
 352         return (idleHandler!=NULL && WMGetBagItemCount(idleHandler)>0);
 353     }
 354
 355     handlerCopy = WMCreateBag(WMGetBagItemCount(idleHandler));
 356     WMAppendBag(handlerCopy, idleHandler);
 357
 358     for (handler = WMBagFirst(handlerCopy, &iter);
 359          iter != NULL;
 360          handler = WMBagNext(handlerCopy, &iter)) {
 361         /* check if the handler still exist or was removed by a callback */
 362         if (WMGetFirstInBag(idleHandler, handler) == WBNotFound)
 363             continue;
 364
 365         (*handler->callback)(handler->clientData);
 366         WMDeleteIdleHandler(handler);
 367     }
 368
 369     WMFreeBag(handlerCopy);
 370
 371     W_FlushIdleNotificationQueue();
 372
 373     /* this is not necesarrily False, because one handler can re-add itself */
 374     return (WMGetBagItemCount(idleHandler)>0);
 375 }
 376
 377
 378
 379 static void
 380 checkTimerHandlers()
 381 {
 382     TimerHandler *handler;
 383     struct timeval now;
 384
 385     if (!timerHandler) {
 386         W_FlushASAPNotificationQueue();
 387         return;
 388     }
 389
 390     rightNow(&now);
 391
 392     handler = timerHandler;
 393     while (handler && IS_AFTER(now, handler->when)) {
 394         SET_ZERO(handler->when);
 395         (*handler->callback)(handler->clientData);
 396         handler = handler->next;
 397     }
 398
 399     while (timerHandler && IS_ZERO(handler->when)) {
 400         handler = timerHandler;
 401         timerHandler = timerHandler->next;
 402
 403         if (handler->nextDelay > 0) {
 404             rightNow(&handler->when);
 405             addmillisecs(&handler->when, handler->nextDelay);
 406             enqueueTimerHandler(handler);
 407         } else {
 408             wfree(handler);
 409         }
 410     }
 411
 412     W_FlushASAPNotificationQueue();
 413 }
 414
 415
 416
 417 static void
 418 delayUntilNextTimerEvent(struct timeval *delay)
 419 {
 420     struct timeval now;
 421
 422     if (!timerHandler) {
 423         /* The return value of this function is only valid if there _are_
 424          timers active. */
 425         delay->tv_sec = 0;
 426         delay->tv_usec = 0;
 427         return;
 428     }
 429
 430     rightNow(&now);
 431     if (IS_AFTER(now, timerHandler->when)) {
 432         delay->tv_sec = 0;
 433         delay->tv_usec = 0;
 434     } else {
 435         delay->tv_sec = timerHandler->when.tv_sec - now.tv_sec;
 436         delay->tv_usec = timerHandler->when.tv_usec - now.tv_usec;
 437         if (delay->tv_usec < 0) {
 438             delay->tv_usec += 1000000;
 439             delay->tv_sec--;
 440         }
 441     }
 442 }
 443
 444
 445
 446
 447 /*
 448  * WMCreateEventHandler--
 449  *      Create an event handler and put it in the event handler list for the
 450  * view. If the same callback and clientdata are already used in another
 451  * handler, the masks are swapped.
 452  *
 453  */
 454 void
 455 WMCreateEventHandler(WMView *view, unsigned long mask, WMEventProc *eventProc,
 456                      void *clientData)
 457 {
 458     W_EventHandler *handler, *ptr;
 459     unsigned long eventMask;
 460     WMBagIterator iter;
 461
 462
 463     handler = NULL;
 464     eventMask = mask;
 465
 466     WM_ITERATE_BAG(view->eventHandlers, ptr, iter) {
 467         if (ptr->clientData == clientData && ptr->proc == eventProc) {
 468             handler = ptr;
 469             eventMask |= ptr->eventMask;
 470         }
 471     }
 472     if (!handler) {
 473         handler = wmalloc(sizeof(W_EventHandler));
 474
 475         WMPutInBag(view->eventHandlers, handler);
 476     }
 477     /* select events for window */
 478     handler->eventMask = eventMask;
 479     handler->proc = eventProc;
 480     handler->clientData = clientData;
 481 }
 482
 483
 484 /*
 485  * WMDeleteEventHandler--
 486  *      Delete event handler matching arguments from windows
 487  * event handler list.
 488  *
 489  */
 490 void
 491 WMDeleteEventHandler(WMView *view, unsigned long mask, WMEventProc *eventProc,
 492                      void *clientData)
 493 {
 494     W_EventHandler *handler, *ptr;
 495     WMBagIterator iter;
 496
 497     handler = NULL;
 498
 499     WM_ITERATE_BAG(view->eventHandlers, ptr, iter) {
 500         if (ptr->eventMask == mask && ptr->proc == eventProc
 501             && ptr->clientData == clientData) {
 502             handler = ptr;
 503             break;
 504         }
 505     }
 506
 507     if (!handler)
 508         return;
 509
 510     WMRemoveFromBag(view->eventHandlers, handler);
 511
 512     wfree(handler);
 513 }
 514
 515
 516
 517 void
 518 W_CleanUpEvents(WMView *view)
 519 {
 520     W_EventHandler *ptr;
 521     WMBagIterator iter;
 522
 523     WM_ITERATE_BAG(view->eventHandlers, ptr, iter) {
 524         wfree(ptr);
 525     }
 526 }
 527
 528
 529
 530 static Time
 531 getEventTime(WMScreen *screen, XEvent *event)
 532 {
 533     switch (event->type) {
 534      case ButtonPress:
 535      case ButtonRelease:
 536         return event->xbutton.time;
 537      case KeyPress:
 538      case KeyRelease:
 539         return event->xkey.time;
 540      case MotionNotify:
 541         return event->xmotion.time;
 542      case EnterNotify:
 543      case LeaveNotify:
 544         return event->xcrossing.time;
 545      case PropertyNotify:
 546         return event->xproperty.time;
 547      case SelectionClear:
 548         return event->xselectionclear.time;
 549      case SelectionRequest:
 550         return event->xselectionrequest.time;
 551      case SelectionNotify:
 552         return event->xselection.time;
 553      default:
 554         return screen->lastEventTime;
 555     }
 556 }
 557
 558
 559 void
 560 W_CallDestroyHandlers(W_View *view)
 561 {
 562     XEvent event;
 563     WMBagIterator iter;
 564     W_EventHandler *hPtr;
 565
 566     event.type = DestroyNotify;
 567     event.xdestroywindow.window = view->window;
 568     event.xdestroywindow.event = view->window;
 569
 570     WM_ITERATE_BAG(view->eventHandlers, hPtr, iter) {
 571         if (hPtr->eventMask & StructureNotifyMask) {
 572             (*hPtr->proc)(&event, hPtr->clientData);
 573         }
 574     }
 575 }
 576
 577
 578
 579 void
 580 WMSetViewNextResponder(WMView *view, WMView *responder)
 581 {
 582     /* set the widget to receive keyboard events that aren't handled
 583      * by this widget */
 584
 585     view->nextResponder = responder;
 586 }
 587
 588
 589 void
 590 WMRelayToNextResponder(WMView *view, XEvent *event)
 591 {
 592     unsigned long mask = eventMasks[event->xany.type];
 593
 594     if (view->nextResponder) {
 595         WMView *next = view->nextResponder;
 596         W_EventHandler *hPtr;
 597         WMBagIterator iter;
 598
 599         WM_ITERATE_BAG(next->eventHandlers, hPtr, iter) {
 600             if ((hPtr->eventMask & mask)) {
 601                 (*hPtr->proc)(event, hPtr->clientData);
 602             }
 603         }
 604     }
 605 }
 606
 607
 608 int
 609 WMHandleEvent(XEvent *event)
 610 {
 611     W_EventHandler *hPtr;
 612     W_View *view, *vPtr, *toplevel;
 613     unsigned long mask;
 614     Window window;
 615     WMBagIterator iter;
 616
 617     if (event->type == MappingNotify) {
 618         XRefreshKeyboardMapping(&event->xmapping);
 619         return True;
 620     }
 621
 622     mask = eventMasks[event->xany.type];
 623
 624     window = event->xany.window;
 625
 626     /* diferentiate SubstructureNotify with StructureNotify */
 627     if (mask == StructureNotifyMask) {
 628         if (event->xmap.event != event->xmap.window) {
 629             mask = SubstructureNotifyMask;
 630             window = event->xmap.event;
 631         }
 632     }
 633     view = W_GetViewForXWindow(event->xany.display, window);
 634
 635     if (!view) {
 636         if (extraEventHandler)
 637             (extraEventHandler)(event);
 638
 639         return False;
 640     }
 641
 642     view->screen->lastEventTime = getEventTime(view->screen, event);
 643
 644     toplevel = W_TopLevelOfView(view);
 645
 646     if (event->type == SelectionNotify || event->type == SelectionClear
 647         || event->type == SelectionRequest) {
 648         /* handle selection related events */
 649         W_HandleSelectionEvent(event);
 650
 651     } else if (event->type == ClientMessage) {
 652
 653         W_HandleDNDClientMessage(toplevel, &event->xclient);
 654     }
 655
 656     /* if it's a key event, redispatch it to the focused control */
 657     if (mask & (KeyPressMask|KeyReleaseMask)) {
 658         W_View *focused = W_FocusedViewOfToplevel(toplevel);
 659
 660         if (focused) {
 661             view = focused;
 662         }
 663     }
 664
 665     /* compress Motion events */
 666     if (event->type == MotionNotify && !view->flags.dontCompressMotion) {
 667         while (XPending(event->xmotion.display)) {
 668             XEvent ev;
 669             XPeekEvent(event->xmotion.display, &ev);
 670             if (ev.type == MotionNotify
 671                 && event->xmotion.window == ev.xmotion.window
 672                 && event->xmotion.subwindow == ev.xmotion.subwindow) {
 673                 /* replace events */
 674                 XNextEvent(event->xmotion.display, event);
 675             } else break;
 676         }
 677     }
 678
 679     /* compress expose events */
 680     if (event->type == Expose && !view->flags.dontCompressExpose) {
 681         while (XCheckTypedWindowEvent(event->xexpose.display, view->window,
 682                                       Expose, event));
 683     }
 684
 685
 686     if (view->screen->modalLoop && toplevel!=view->screen->modalView
 687         && !toplevel->flags.worksWhenModal) {
 688         if (event->type == KeyPress || event->type == KeyRelease
 689             || event->type == MotionNotify || event->type == ButtonPress
 690             || event->type == ButtonRelease
 691             || event->type == FocusIn || event->type == FocusOut) {
 692             return True;
 693         }
 694     }
 695
 696     /* do balloon stuffs */
 697     if (event->type == EnterNotify)
 698         W_BalloonHandleEnterView(view);
 699     else if (event->type == LeaveNotify)
 700         W_BalloonHandleLeaveView(view);
 701
 702     /* This is a hack. It will make the panel be secure while
 703      * the event handlers are handled, as some event handler
 704      * might destroy the widget. */
 705     W_RetainView(toplevel);
 706
 707     WM_ITERATE_BAG(view->eventHandlers, hPtr, iter) {
 708         if ((hPtr->eventMask & mask)) {
 709             (*hPtr->proc)(event, hPtr->clientData);
 710         }
 711     }
 712 #if 0
 713     /* pass the event to the top level window of the widget */
 714     /* TODO: change this to a responder chain */
 715     if (view->parent != NULL) {
 716         vPtr = view;
 717         while (vPtr->parent != NULL)
 718             vPtr = vPtr->parent;
 719
 720         WM_ITERATE_BAG(vPtr->eventHandlers, hPtr, iter) {
 721             if (hPtr->eventMask & mask) {
 722                 (*hPtr->proc)(event, hPtr->clientData);
 723             }
 724         }
 725     }
 726 #endif
 727     /* save button click info to track double-clicks */
 728     if (view->screen->ignoreNextDoubleClick) {
 729         view->screen->ignoreNextDoubleClick = 0;
 730     } else {
 731         if (event->type == ButtonPress) {
 732             view->screen->lastClickWindow = event->xbutton.window;
 733             view->screen->lastClickTime = event->xbutton.time;
 734         }
 735     }
 736
 737     W_ReleaseView(toplevel);
 738
 739     return True;
 740 }
 741
 742
 743 int
 744 WMIsDoubleClick(XEvent *event)
 745 {
 746     W_View *view;
 747
 748     if (event->type != ButtonPress)
 749         return False;
 750
 751     view = W_GetViewForXWindow(event->xany.display, event->xbutton.window);
 752
 753     if (!view)
 754         return False;
 755
 756     if (view->screen->lastClickWindow != event->xbutton.window)
 757         return False;
 758
 759     if (event->xbutton.time - view->screen->lastClickTime
 760         < WINGsConfiguration.doubleClickDelay) {
 761         view->screen->lastClickTime = 0;
 762         view->screen->lastClickWindow = None;
 763         view->screen->ignoreNextDoubleClick = 1;
 764         return True;
 765     } else
 766         return False;
 767 }
 768
 769
 770 Bool
 771 W_WaitForEvent(Display *dpy, unsigned long xeventmask)
 772 {
 773 #if defined(HAVE_POLL) && defined(HAVE_POLL_H) && !defined(HAVE_SELECT)
 774     struct pollfd *fds;
 775     InputHandler *handler;
 776     int count, timeout, nfds, i, retval;
 777
 778     if (inputHandler)
 779         nfds = WMGetBagItemCount(inputHandler);
 780     else
 781         nfds = 0;
 782
 783     fds = wmalloc(nfds+1 * sizeof(struct pollfd));
 784     /* put this to the end of array to avoid using ranges from 1 to nfds+1 */
 785     fds[nfds].fd = ConnectionNumber(dpy);
 786     fds[nfds].events = POLLIN;
 787
 788     for (i = 0; i<nfds; i++) {
 789         handler = WMGetFromBag(inputHandler, i);
 790         fds[i].fd = handler->fd;
 791         fds[i].events = 0;
 792         if (handler->mask & WIReadMask)
 793             fds[i].events |= POLLIN;
 794
 795         if (handler->mask & WIWriteMask)
 796             fds[i].events |= POLLOUT;
 797
 798 #if 0 /* FIXME */
 799         if (handler->mask & WIExceptMask)
 800             FD_SET(handler->fd, &eset);
 801 #endif
 802     }
 803
 804     /*
 805      * Setup the select() timeout to the estimated time until the
 806      * next timer expires.
 807      */
 808     if (timerPending()) {
 809         struct timeval tv;
 810         delayUntilNextTimerEvent(&tv);
 811         timeout = tv.tv_sec * 1000 + tv.tv_usec / 1000;
 812     } else {
 813         timeout = -1;
 814     }
 815
 816     if (xeventmask==0) {
 817         if (XPending(dpy))
 818             return True;
 819     } else {
 820         XEvent ev;
 821         if (XCheckMaskEvent(dpy, xeventmask, &ev)) {
 822             XPutBackEvent(dpy, &ev);
 823             return True;
 824         }
 825     }
 826
 827     count = poll(fds, nfds, timeout);
 828
 829     if (count>0 && nfds>0) {
 830         WMBag *handlerCopy = WMCreateBag(nfds);
 831
 832         for (i=0; i<nfds; i++)
 833             WMPutInBag(handlerCopy, WMGetFromBag(inputHandler, i));
 834
 835         for (i=0; i<nfds; i++) {
 836             int mask;
 837
 838             handler = WMGetFromBag(handlerCopy, i);
 839             /* check if the handler still exist or was removed by a callback */
 840             if (WMGetFirstInBag(inputHandler, handler) == WBNotFound)
 841                 continue;
 842
 843             mask = 0;
 844
 845             if ((handler->mask & WIReadMask) &&
 846                 (fds[i].revents & (POLLIN|POLLRDNORM|POLLRDBAND|POLLPRI)))
 847                 mask |= WIReadMask;
 848
 849             if ((handler->mask & WIWriteMask) &&
 850                 (fds[i].revents & (POLLOUT | POLLWRBAND)))
 851                 mask |= WIWriteMask;
 852
 853             if ((handler->mask & WIExceptMask) &&
 854                 (fds[i].revents & (POLLHUP | POLLNVAL | POLLERR)))
 855                 mask |= WIExceptMask;
 856
 857             if (mask!=0 && handler->callback) {
 858                 (*handler->callback)(handler->fd, mask,
 859                                      handler->clientData);
 860             }
 861         }
 862
 863         WMFreeBag(handlerCopy);
 864     }
 865
 866     retval = fds[nfds].revents & (POLLIN|POLLRDNORM|POLLRDBAND|POLLPRI);
 867     wfree(fds);
 868
 869     W_FlushASAPNotificationQueue();
 870
 871     return retval;
 872 #else /* not HAVE_POLL */
 873 #ifdef HAVE_SELECT
 874     struct timeval timeout;
 875     struct timeval *timeoutPtr;
 876     fd_set rset, wset, eset;
 877     int maxfd, nfds, i;
 878     int count;
 879     InputHandler *handler;
 880
 881     FD_ZERO(&rset);
 882     FD_ZERO(&wset);
 883     FD_ZERO(&eset);
 884
 885     FD_SET(ConnectionNumber(dpy), &rset);
 886     maxfd = ConnectionNumber(dpy);
 887
 888     if (inputHandler)
 889         nfds = WMGetBagItemCount(inputHandler);
 890     else
 891         nfds = 0;
 892
 893     for (i=0; i<nfds; i++) {
 894         handler = WMGetFromBag(inputHandler, i);
 895         if (handler->mask & WIReadMask)
 896             FD_SET(handler->fd, &rset);
 897
 898         if (handler->mask & WIWriteMask)
 899             FD_SET(handler->fd, &wset);
 900
 901         if (handler->mask & WIExceptMask)
 902             FD_SET(handler->fd, &eset);
 903
 904         if (maxfd < handler->fd)
 905             maxfd = handler->fd;
 906     }
 907
 908
 909     /*
 910      * Setup the select() timeout to the estimated time until the
 911      * next timer expires.
 912      */
 913     if (timerPending()) {
 914         delayUntilNextTimerEvent(&timeout);
 915         timeoutPtr = &timeout;
 916     } else {
 917         timeoutPtr = (struct timeval*)0;
 918     }
 919
 920     XSync(dpy, False);
 921     if (xeventmask==0) {
 922         if (XPending(dpy))
 923             return True;
 924     } else {
 925         XEvent ev;
 926         if (XCheckMaskEvent(dpy, xeventmask, &ev)) {
 927             XPutBackEvent(dpy, &ev);
 928             return True;
 929         }
 930     }
 931
 932     count = select(1 + maxfd, &rset, &wset, &eset, timeoutPtr);
 933
 934     if (count>0 && nfds>0) {
 935         WMBag *handlerCopy = WMCreateBag(nfds);
 936
 937         for (i=0; i<nfds; i++)
 938             WMPutInBag(handlerCopy, WMGetFromBag(inputHandler, i));
 939
 940         for (i=0; i<nfds; i++) {
 941             int mask;
 942
 943             handler = WMGetFromBag(handlerCopy, i);
 944             /* check if the handler still exist or was removed by a callback */
 945             if (WMGetFirstInBag(inputHandler, handler) == WBNotFound)
 946                 continue;
 947
 948             mask = 0;
 949
 950             if ((handler->mask & WIReadMask) && FD_ISSET(handler->fd, &rset))
 951                 mask |= WIReadMask;
 952
 953             if ((handler->mask & WIWriteMask) && FD_ISSET(handler->fd, &wset))
 954                 mask |= WIWriteMask;
 955
 956             if ((handler->mask & WIExceptMask) && FD_ISSET(handler->fd, &eset))
 957                 mask |= WIExceptMask;
 958
 959             if (mask!=0 && handler->callback) {
 960                 (*handler->callback)(handler->fd, mask,
 961                                      handler->clientData);
 962             }
 963         }
 964
 965         WMFreeBag(handlerCopy);
 966     }
 967
 968     W_FlushASAPNotificationQueue();
 969
 970     return FD_ISSET(ConnectionNumber(dpy), &rset);
 971 #else /* not HAVE_SELECT, not HAVE_POLL */
 972 Neither select nor poll. You lose.
 973 #endif /* HAVE_SELECT */
 974 #endif /* HAVE_POLL */
 975 }
 976
 977
 978 void
 979 WMNextEvent(Display *dpy, XEvent *event)
 980 {
 981     /* Check any expired timers */
 982     checkTimerHandlers();
 983
 984     while (XPending(dpy) == 0) {
 985         /* Do idle stuff */
 986         /* Do idle and timer stuff while there are no timer or X events */
 987         while (XPending(dpy) == 0 && checkIdleHandlers()) {
 988             /* dispatch timer events */
 989             checkTimerHandlers();
 990         }
 991
 992         /*
 993          * Make sure that new events did not arrive while we were doing
 994          * timer/idle stuff. Or we might block forever waiting for
 995          * an event that already arrived.
 996          */
 997         /* wait for something to happen or a timer to expire */
 998         W_WaitForEvent(dpy, 0);
 999
1000         /* Check any expired timers */
1001         checkTimerHandlers();
1002     }
1003
1004     XNextEvent(dpy, event);
1005 }
1006
1007 #if 0
1008 void
1009 WMMaskEvent(Display *dpy, long mask, XEvent *event)
1010 {
1011     unsigned long milliseconds;
1012     struct timeval timeout;
1013     struct timeval *timeoutOrInfty;
1014     fd_set readset;
1015
1016     while (!XCheckMaskEvent(dpy, mask, event)) {
1017         /* Do idle stuff while there are no timer or X events */
1018         while (checkIdleHandlers()) {
1019             if (XCheckMaskEvent(dpy, mask, event))
1020                 return;
1021         }
1022
1023         /*
1024          * Setup the select() timeout to the estimated time until the
1025          * next timer expires.
1026          */
1027         if (timerPending()) {
1028             delayUntilNextTimerEvent(&timeout);
1029             timeoutOrInfty = &timeout;
1030         } else {
1031             timeoutOrInfty = (struct timeval*)0;
1032         }
1033
1034         if (XCheckMaskEvent(dpy, mask, event))
1035             return;
1036
1037         /* Wait for input on the X connection socket */
1038         FD_ZERO(&readset);
1039         FD_SET(ConnectionNumber(dpy), &readset);
1040         select(1 + ConnectionNumber(dpy), &readset, (fd_set*)0, (fd_set*)0,
1041                timeoutOrInfty);
1042
1043         /* Check any expired timers */
1044         checkTimerHandlers();
1045     }
1046 }
1047 #endif
1048 #if 1
1049 /*
1050  * Cant use this because XPending() will make W_WaitForEvent
1051  * return even if the event in the queue is not what we want,
1052  * and if we block until some new event arrives from the
1053  * server, other events already in the queue (like Expose)
1054  * will be deferred.
1055  */
1056 void
1057 WMMaskEvent(Display *dpy, long mask, XEvent *event)
1058 {
1059     while (!XCheckMaskEvent(dpy, mask, event)) {
1060         /* Do idle stuff while there are no timer or X events */
1061         while (checkIdleHandlers()) {
1062             if (XCheckMaskEvent(dpy, mask, event))
1063                 return;
1064         }
1065
1066         /* Wait for input on the X connection socket */
1067         W_WaitForEvent(dpy, mask);
1068
1069         /* Check any expired timers */
1070         checkTimerHandlers();
1071     }
1072 }
1073 #endif
1074
1075 Bool
1076 WMScreenPending(WMScreen *scr)
1077 {
1078     if (XPending(scr->display))
1079         return True;
1080     else
1081         return False;
1082 }
1083
1084
1085 WMEventHook*
1086 WMHookEventHandler(WMEventHook *handler)
1087 {
1088     WMEventHook *oldHandler = extraEventHandler;
1089
1090     extraEventHandler = handler;
1091
1092     return oldHandler;
1093 }
1094
1095