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         if (!IS_ZERO(handler->when)) {
 395             SET_ZERO(handler->when);
 396             (*handler->callback)(handler->clientData);
 397         }
 398         handler = handler->next;
 399     }
 400
 401     while (timerHandler && IS_ZERO(handler->when)) {
 402         handler = timerHandler;
 403         timerHandler = timerHandler->next;
 404
 405         if (handler->nextDelay > 0) {
 406             handler->when = now;
 407             addmillisecs(&handler->when, handler->nextDelay);
 408             enqueueTimerHandler(handler);
 409         } else {
 410             wfree(handler);
 411         }
 412     }
 413
 414     W_FlushASAPNotificationQueue();
 415 }
 416
 417
 418
 419 static void
 420 delayUntilNextTimerEvent(struct timeval *delay)
 421 {
 422     struct timeval now;
 423
 424     if (!timerHandler) {
 425         /* The return value of this function is only valid if there _are_
 426          timers active. */
 427         delay->tv_sec = 0;
 428         delay->tv_usec = 0;
 429         return;
 430     }
 431
 432     rightNow(&now);
 433     if (IS_AFTER(now, timerHandler->when)) {
 434         delay->tv_sec = 0;
 435         delay->tv_usec = 0;
 436     } else {
 437         delay->tv_sec = timerHandler->when.tv_sec - now.tv_sec;
 438         delay->tv_usec = timerHandler->when.tv_usec - now.tv_usec;
 439         if (delay->tv_usec < 0) {
 440             delay->tv_usec += 1000000;
 441             delay->tv_sec--;
 442         }
 443     }
 444 }
 445
 446
 447
 448
 449 /*
 450  * WMCreateEventHandler--
 451  *      Create an event handler and put it in the event handler list for the
 452  * view. If the same callback and clientdata are already used in another
 453  * handler, the masks are swapped.
 454  *
 455  */
 456 void
 457 WMCreateEventHandler(WMView *view, unsigned long mask, WMEventProc *eventProc,
 458                      void *clientData)
 459 {
 460     W_EventHandler *handler, *ptr;
 461     unsigned long eventMask;
 462     WMBagIterator iter;
 463
 464
 465     handler = NULL;
 466     eventMask = mask;
 467
 468     WM_ITERATE_BAG(view->eventHandlers, ptr, iter) {
 469         if (ptr->clientData == clientData && ptr->proc == eventProc) {
 470             handler = ptr;
 471             eventMask |= ptr->eventMask;
 472         }
 473     }
 474     if (!handler) {
 475         handler = wmalloc(sizeof(W_EventHandler));
 476
 477         WMPutInBag(view->eventHandlers, handler);
 478     }
 479     /* select events for window */
 480     handler->eventMask = eventMask;
 481     handler->proc = eventProc;
 482     handler->clientData = clientData;
 483 }
 484
 485
 486 /*
 487  * WMDeleteEventHandler--
 488  *      Delete event handler matching arguments from windows
 489  * event handler list.
 490  *
 491  */
 492 void
 493 WMDeleteEventHandler(WMView *view, unsigned long mask, WMEventProc *eventProc,
 494                      void *clientData)
 495 {
 496     W_EventHandler *handler, *ptr;
 497     WMBagIterator iter;
 498
 499     handler = NULL;
 500
 501     WM_ITERATE_BAG(view->eventHandlers, ptr, iter) {
 502         if (ptr->eventMask == mask && ptr->proc == eventProc
 503             && ptr->clientData == clientData) {
 504             handler = ptr;
 505             break;
 506         }
 507     }
 508
 509     if (!handler)
 510         return;
 511
 512     WMRemoveFromBag(view->eventHandlers, handler);
 513
 514     wfree(handler);
 515 }
 516
 517
 518
 519 void
 520 W_CleanUpEvents(WMView *view)
 521 {
 522     W_EventHandler *ptr;
 523     WMBagIterator iter;
 524
 525     WM_ITERATE_BAG(view->eventHandlers, ptr, iter) {
 526         wfree(ptr);
 527     }
 528 }
 529
 530
 531
 532 static Time
 533 getEventTime(WMScreen *screen, XEvent *event)
 534 {
 535     switch (event->type) {
 536      case ButtonPress:
 537      case ButtonRelease:
 538         return event->xbutton.time;
 539      case KeyPress:
 540      case KeyRelease:
 541         return event->xkey.time;
 542      case MotionNotify:
 543         return event->xmotion.time;
 544      case EnterNotify:
 545      case LeaveNotify:
 546         return event->xcrossing.time;
 547      case PropertyNotify:
 548         return event->xproperty.time;
 549      case SelectionClear:
 550         return event->xselectionclear.time;
 551      case SelectionRequest:
 552         return event->xselectionrequest.time;
 553      case SelectionNotify:
 554         return event->xselection.time;
 555      default:
 556         return screen->lastEventTime;
 557     }
 558 }
 559
 560
 561 void
 562 W_CallDestroyHandlers(W_View *view)
 563 {
 564     XEvent event;
 565     WMBagIterator iter;
 566     W_EventHandler *hPtr;
 567
 568     event.type = DestroyNotify;
 569     event.xdestroywindow.window = view->window;
 570     event.xdestroywindow.event = view->window;
 571
 572     WM_ITERATE_BAG(view->eventHandlers, hPtr, iter) {
 573         if (hPtr->eventMask & StructureNotifyMask) {
 574             (*hPtr->proc)(&event, hPtr->clientData);
 575         }
 576     }
 577 }
 578
 579
 580
 581 void
 582 WMSetViewNextResponder(WMView *view, WMView *responder)
 583 {
 584     /* set the widget to receive keyboard events that aren't handled
 585      * by this widget */
 586
 587     view->nextResponder = responder;
 588 }
 589
 590
 591 void
 592 WMRelayToNextResponder(WMView *view, XEvent *event)
 593 {
 594     unsigned long mask = eventMasks[event->xany.type];
 595
 596     if (view->nextResponder) {
 597         WMView *next = view->nextResponder;
 598         W_EventHandler *hPtr;
 599         WMBagIterator iter;
 600
 601         WM_ITERATE_BAG(next->eventHandlers, hPtr, iter) {
 602             if ((hPtr->eventMask & mask)) {
 603                 (*hPtr->proc)(event, hPtr->clientData);
 604             }
 605         }
 606     }
 607 }
 608
 609
 610 int
 611 WMHandleEvent(XEvent *event)
 612 {
 613     W_EventHandler *hPtr;
 614     W_View *view, *vPtr, *toplevel;
 615     unsigned long mask;
 616     Window window;
 617     WMBagIterator iter;
 618
 619     if (event->type == MappingNotify) {
 620         XRefreshKeyboardMapping(&event->xmapping);
 621         return True;
 622     }
 623
 624     mask = eventMasks[event->xany.type];
 625
 626     window = event->xany.window;
 627
 628     /* diferentiate SubstructureNotify with StructureNotify */
 629     if (mask == StructureNotifyMask) {
 630         if (event->xmap.event != event->xmap.window) {
 631             mask = SubstructureNotifyMask;
 632             window = event->xmap.event;
 633         }
 634     }
 635     view = W_GetViewForXWindow(event->xany.display, window);
 636
 637     if (!view) {
 638         if (extraEventHandler)
 639             (extraEventHandler)(event);
 640
 641         return False;
 642     }
 643
 644     view->screen->lastEventTime = getEventTime(view->screen, event);
 645
 646     toplevel = W_TopLevelOfView(view);
 647
 648     if (event->type == SelectionNotify || event->type == SelectionClear
 649         || event->type == SelectionRequest) {
 650         /* handle selection related events */
 651         W_HandleSelectionEvent(event);
 652
 653     } else if (event->type == ClientMessage) {
 654
 655         W_HandleDNDClientMessage(toplevel, &event->xclient);
 656     }
 657
 658     /* if it's a key event, redispatch it to the focused control */
 659     if (mask & (KeyPressMask|KeyReleaseMask)) {
 660         W_View *focused = W_FocusedViewOfToplevel(toplevel);
 661
 662         if (focused) {
 663             view = focused;
 664         }
 665     }
 666
 667     /* compress Motion events */
 668     if (event->type == MotionNotify && !view->flags.dontCompressMotion) {
 669         while (XPending(event->xmotion.display)) {
 670             XEvent ev;
 671             XPeekEvent(event->xmotion.display, &ev);
 672             if (ev.type == MotionNotify
 673                 && event->xmotion.window == ev.xmotion.window
 674                 && event->xmotion.subwindow == ev.xmotion.subwindow) {
 675                 /* replace events */
 676                 XNextEvent(event->xmotion.display, event);
 677             } else break;
 678         }
 679     }
 680
 681     /* compress expose events */
 682     if (event->type == Expose && !view->flags.dontCompressExpose) {
 683         while (XCheckTypedWindowEvent(event->xexpose.display, view->window,
 684                                       Expose, event));
 685     }
 686
 687
 688     if (view->screen->modalLoop && toplevel!=view->screen->modalView
 689         && !toplevel->flags.worksWhenModal) {
 690         if (event->type == KeyPress || event->type == KeyRelease
 691             || event->type == MotionNotify || event->type == ButtonPress
 692             || event->type == ButtonRelease
 693             || event->type == FocusIn || event->type == FocusOut) {
 694             return True;
 695         }
 696     }
 697
 698     /* do balloon stuffs */
 699     if (event->type == EnterNotify)
 700         W_BalloonHandleEnterView(view);
 701     else if (event->type == LeaveNotify)
 702         W_BalloonHandleLeaveView(view);
 703
 704     /* This is a hack. It will make the panel be secure while
 705      * the event handlers are handled, as some event handler
 706      * might destroy the widget. */
 707     W_RetainView(toplevel);
 708
 709     WM_ITERATE_BAG(view->eventHandlers, hPtr, iter) {
 710         if ((hPtr->eventMask & mask)) {
 711             (*hPtr->proc)(event, hPtr->clientData);
 712         }
 713     }
 714 #if 0
 715     /* pass the event to the top level window of the widget */
 716     /* TODO: change this to a responder chain */
 717     if (view->parent != NULL) {
 718         vPtr = view;
 719         while (vPtr->parent != NULL)
 720             vPtr = vPtr->parent;
 721
 722         WM_ITERATE_BAG(vPtr->eventHandlers, hPtr, iter) {
 723             if (hPtr->eventMask & mask) {
 724                 (*hPtr->proc)(event, hPtr->clientData);
 725             }
 726         }
 727     }
 728 #endif
 729     /* save button click info to track double-clicks */
 730     if (view->screen->ignoreNextDoubleClick) {
 731         view->screen->ignoreNextDoubleClick = 0;
 732     } else {
 733         if (event->type == ButtonPress) {
 734             view->screen->lastClickWindow = event->xbutton.window;
 735             view->screen->lastClickTime = event->xbutton.time;
 736         }
 737     }
 738
 739     W_ReleaseView(toplevel);
 740
 741     return True;
 742 }
 743
 744
 745 int
 746 WMIsDoubleClick(XEvent *event)
 747 {
 748     W_View *view;
 749
 750     if (event->type != ButtonPress)
 751         return False;
 752
 753     view = W_GetViewForXWindow(event->xany.display, event->xbutton.window);
 754
 755     if (!view)
 756         return False;
 757
 758     if (view->screen->lastClickWindow != event->xbutton.window)
 759         return False;
 760
 761     if (event->xbutton.time - view->screen->lastClickTime
 762         < WINGsConfiguration.doubleClickDelay) {
 763         view->screen->lastClickTime = 0;
 764         view->screen->lastClickWindow = None;
 765         view->screen->ignoreNextDoubleClick = 1;
 766         return True;
 767     } else
 768         return False;
 769 }
 770
 771
 772 Bool
 773 W_WaitForEvent(Display *dpy, unsigned long xeventmask)
 774 {
 775 #if defined(HAVE_POLL) && defined(HAVE_POLL_H) && !defined(HAVE_SELECT)
 776     struct pollfd *fds;
 777     InputHandler *handler;
 778     int count, timeout, nfds, i, retval;
 779
 780     if (inputHandler)
 781         nfds = WMGetBagItemCount(inputHandler);
 782     else
 783         nfds = 0;
 784
 785     fds = wmalloc(nfds+1 * sizeof(struct pollfd));
 786     /* put this to the end of array to avoid using ranges from 1 to nfds+1 */
 787     fds[nfds].fd = ConnectionNumber(dpy);
 788     fds[nfds].events = POLLIN;
 789
 790     for (i = 0; i<nfds; i++) {
 791         handler = WMGetFromBag(inputHandler, i);
 792         fds[i].fd = handler->fd;
 793         fds[i].events = 0;
 794         if (handler->mask & WIReadMask)
 795             fds[i].events |= POLLIN;
 796
 797         if (handler->mask & WIWriteMask)
 798             fds[i].events |= POLLOUT;
 799
 800 #if 0 /* FIXME */
 801         if (handler->mask & WIExceptMask)
 802             FD_SET(handler->fd, &eset);
 803 #endif
 804     }
 805
 806     /*
 807      * Setup the select() timeout to the estimated time until the
 808      * next timer expires.
 809      */
 810     if (timerPending()) {
 811         struct timeval tv;
 812         delayUntilNextTimerEvent(&tv);
 813         timeout = tv.tv_sec * 1000 + tv.tv_usec / 1000;
 814     } else {
 815         timeout = -1;
 816     }
 817
 818     if (xeventmask==0) {
 819         if (XPending(dpy))
 820             return True;
 821     } else {
 822         XEvent ev;
 823         if (XCheckMaskEvent(dpy, xeventmask, &ev)) {
 824             XPutBackEvent(dpy, &ev);
 825             return True;
 826         }
 827     }
 828
 829     count = poll(fds, nfds, timeout);
 830
 831     if (count>0 && nfds>0) {
 832         WMBag *handlerCopy = WMCreateBag(nfds);
 833
 834         for (i=0; i<nfds; i++)
 835             WMPutInBag(handlerCopy, WMGetFromBag(inputHandler, i));
 836
 837         for (i=0; i<nfds; i++) {
 838             int mask;
 839
 840             handler = WMGetFromBag(handlerCopy, i);
 841             /* check if the handler still exist or was removed by a callback */
 842             if (WMGetFirstInBag(inputHandler, handler) == WBNotFound)
 843                 continue;
 844
 845             mask = 0;
 846
 847             if ((handler->mask & WIReadMask) &&
 848                 (fds[i].revents & (POLLIN|POLLRDNORM|POLLRDBAND|POLLPRI)))
 849                 mask |= WIReadMask;
 850
 851             if ((handler->mask & WIWriteMask) &&
 852                 (fds[i].revents & (POLLOUT | POLLWRBAND)))
 853                 mask |= WIWriteMask;
 854
 855             if ((handler->mask & WIExceptMask) &&
 856                 (fds[i].revents & (POLLHUP | POLLNVAL | POLLERR)))
 857                 mask |= WIExceptMask;
 858
 859             if (mask!=0 && handler->callback) {
 860                 (*handler->callback)(handler->fd, mask,
 861                                      handler->clientData);
 862             }
 863         }
 864
 865         WMFreeBag(handlerCopy);
 866     }
 867
 868     retval = fds[nfds].revents & (POLLIN|POLLRDNORM|POLLRDBAND|POLLPRI);
 869     wfree(fds);
 870
 871     W_FlushASAPNotificationQueue();
 872
 873     return retval;
 874 #else /* not HAVE_POLL */
 875 #ifdef HAVE_SELECT
 876     struct timeval timeout;
 877     struct timeval *timeoutPtr;
 878     fd_set rset, wset, eset;
 879     int maxfd, nfds, i;
 880     int count;
 881     InputHandler *handler;
 882
 883     FD_ZERO(&rset);
 884     FD_ZERO(&wset);
 885     FD_ZERO(&eset);
 886
 887     FD_SET(ConnectionNumber(dpy), &rset);
 888     maxfd = ConnectionNumber(dpy);
 889
 890     if (inputHandler)
 891         nfds = WMGetBagItemCount(inputHandler);
 892     else
 893         nfds = 0;
 894
 895     for (i=0; i<nfds; i++) {
 896         handler = WMGetFromBag(inputHandler, i);
 897         if (handler->mask & WIReadMask)
 898             FD_SET(handler->fd, &rset);
 899
 900         if (handler->mask & WIWriteMask)
 901             FD_SET(handler->fd, &wset);
 902
 903         if (handler->mask & WIExceptMask)
 904             FD_SET(handler->fd, &eset);
 905
 906         if (maxfd < handler->fd)
 907             maxfd = handler->fd;
 908     }
 909
 910
 911     /*
 912      * Setup the select() timeout to the estimated time until the
 913      * next timer expires.
 914      */
 915     if (timerPending()) {
 916         delayUntilNextTimerEvent(&timeout);
 917         timeoutPtr = &timeout;
 918     } else {
 919         timeoutPtr = (struct timeval*)0;
 920     }
 921
 922     XSync(dpy, False);
 923     if (xeventmask==0) {
 924         if (XPending(dpy))
 925             return True;
 926     } else {
 927         XEvent ev;
 928         if (XCheckMaskEvent(dpy, xeventmask, &ev)) {
 929             XPutBackEvent(dpy, &ev);
 930             return True;
 931         }
 932     }
 933
 934     count = select(1 + maxfd, &rset, &wset, &eset, timeoutPtr);
 935
 936     if (count>0 && nfds>0) {
 937         WMBag *handlerCopy = WMCreateBag(nfds);
 938
 939         for (i=0; i<nfds; i++)
 940             WMPutInBag(handlerCopy, WMGetFromBag(inputHandler, i));
 941
 942         for (i=0; i<nfds; i++) {
 943             int mask;
 944
 945             handler = WMGetFromBag(handlerCopy, i);
 946             /* check if the handler still exist or was removed by a callback */
 947             if (WMGetFirstInBag(inputHandler, handler) == WBNotFound)
 948                 continue;
 949
 950             mask = 0;
 951
 952             if ((handler->mask & WIReadMask) && FD_ISSET(handler->fd, &rset))
 953                 mask |= WIReadMask;
 954
 955             if ((handler->mask & WIWriteMask) && FD_ISSET(handler->fd, &wset))
 956                 mask |= WIWriteMask;
 957
 958             if ((handler->mask & WIExceptMask) && FD_ISSET(handler->fd, &eset))
 959                 mask |= WIExceptMask;
 960
 961             if (mask!=0 && handler->callback) {
 962                 (*handler->callback)(handler->fd, mask,
 963                                      handler->clientData);
 964             }
 965         }
 966
 967         WMFreeBag(handlerCopy);
 968     }
 969
 970     W_FlushASAPNotificationQueue();
 971
 972     return FD_ISSET(ConnectionNumber(dpy), &rset);
 973 #else /* not HAVE_SELECT, not HAVE_POLL */
 974 Neither select nor poll. You lose.
 975 #endif /* HAVE_SELECT */
 976 #endif /* HAVE_POLL */
 977 }
 978
 979
 980 void
 981 WMNextEvent(Display *dpy, XEvent *event)
 982 {
 983     /* Check any expired timers */
 984     checkTimerHandlers();
 985
 986     while (XPending(dpy) == 0) {
 987         /* Do idle stuff */
 988         /* Do idle and timer stuff while there are no timer or X events */
 989         while (XPending(dpy) == 0 && checkIdleHandlers()) {
 990             /* dispatch timer events */
 991             checkTimerHandlers();
 992         }
 993
 994         /*
 995          * Make sure that new events did not arrive while we were doing
 996          * timer/idle stuff. Or we might block forever waiting for
 997          * an event that already arrived.
 998          */
 999         /* wait for something to happen or a timer to expire */
1000         W_WaitForEvent(dpy, 0);
1001
1002         /* Check any expired timers */
1003         checkTimerHandlers();
1004     }
1005
1006     XNextEvent(dpy, event);
1007 }
1008
1009 #if 0
1010 void
1011 WMMaskEvent(Display *dpy, long mask, XEvent *event)
1012 {
1013     unsigned long milliseconds;
1014     struct timeval timeout;
1015     struct timeval *timeoutOrInfty;
1016     fd_set readset;
1017
1018     while (!XCheckMaskEvent(dpy, mask, event)) {
1019         /* Do idle stuff while there are no timer or X events */
1020         while (checkIdleHandlers()) {
1021             if (XCheckMaskEvent(dpy, mask, event))
1022                 return;
1023         }
1024
1025         /*
1026          * Setup the select() timeout to the estimated time until the
1027          * next timer expires.
1028          */
1029         if (timerPending()) {
1030             delayUntilNextTimerEvent(&timeout);
1031             timeoutOrInfty = &timeout;
1032         } else {
1033             timeoutOrInfty = (struct timeval*)0;
1034         }
1035
1036         if (XCheckMaskEvent(dpy, mask, event))
1037             return;
1038
1039         /* Wait for input on the X connection socket */
1040         FD_ZERO(&readset);
1041         FD_SET(ConnectionNumber(dpy), &readset);
1042         select(1 + ConnectionNumber(dpy), &readset, (fd_set*)0, (fd_set*)0,
1043                timeoutOrInfty);
1044
1045         /* Check any expired timers */
1046         checkTimerHandlers();
1047     }
1048 }
1049 #endif
1050 #if 1
1051 /*
1052  * Cant use this because XPending() will make W_WaitForEvent
1053  * return even if the event in the queue is not what we want,
1054  * and if we block until some new event arrives from the
1055  * server, other events already in the queue (like Expose)
1056  * will be deferred.
1057  */
1058 void
1059 WMMaskEvent(Display *dpy, long mask, XEvent *event)
1060 {
1061     while (!XCheckMaskEvent(dpy, mask, event)) {
1062         /* Do idle stuff while there are no timer or X events */
1063         while (checkIdleHandlers()) {
1064             if (XCheckMaskEvent(dpy, mask, event))
1065                 return;
1066         }
1067
1068         /* Wait for input on the X connection socket */
1069         W_WaitForEvent(dpy, mask);
1070
1071         /* Check any expired timers */
1072         checkTimerHandlers();
1073     }
1074 }
1075 #endif
1076
1077 Bool
1078 WMScreenPending(WMScreen *scr)
1079 {
1080     if (XPending(scr->display))
1081         return True;
1082     else
1083         return False;
1084 }
1085
1086
1087 WMEventHook*
1088 WMHookEventHandler(WMEventHook *handler)
1089 {
1090     WMEventHook *oldHandler = extraEventHandler;
1091
1092     extraEventHandler = handler;
1093
1094     return oldHandler;
1095 }
1096
1097