Dogcows Code - chaz/openbox/blob - src/BaseDisplay.cc

   1 // BaseDisplay.cc for Openbox
   2 // Copyright (c) 2001 Sean 'Shaleh' Perry <shaleh@debian.org>
   3 // Copyright (c) 1997 - 2000 Brad Hughes (bhughes@tcac.net)
   4 //
   5 // Permission is hereby granted, free of charge, to any person obtaining a
   6 // copy of this software and associated documentation files (the "Software"),
   7 // to deal in the Software without restriction, including without limitation
   8 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9 // and/or sell copies of the Software, and to permit persons to whom the
  10 // Software is furnished to do so, subject to the following conditions:
  11 //
  12 // The above copyright notice and this permission notice shall be included in
  13 // all copies or substantial portions of the Software.
  14 //
  15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18 // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21 // DEALINGS IN THE SOFTWARE.
  22
  23 // stupid macros needed to access some functions in version 2 of the GNU C
  24 // library
  25 #ifndef   _GNU_SOURCE
  26 #define   _GNU_SOURCE
  27 #endif // _GNU_SOURCE
  28
  29 #ifdef    HAVE_CONFIG_H
  30 #  include "../config.h"
  31 #endif // HAVE_CONFIG_H
  32
  33 #include <X11/Xlib.h>
  34 #include <X11/Xatom.h>
  35 #include <X11/Xutil.h>
  36 #include <X11/cursorfont.h>
  37 #include <X11/keysym.h>
  38
  39 #ifdef    SHAPE
  40 #  include <X11/extensions/shape.h>
  41 #endif // SHAPE
  42
  43 #ifdef    HAVE_FCNTL_H
  44 #  include <fcntl.h>
  45 #endif // HAVE_FCNTL_H
  46
  47 #ifdef    HAVE_STDIO_H
  48 #  include <stdio.h>
  49 #endif // HAVE_STDIO_H
  50
  51 #ifdef    HAVE_STDLIB_H
  52 #  include <stdlib.h>
  53 #endif // HAVE_STDLIB_H
  54
  55 #ifdef    HAVE_STRING_H
  56 #  include <string.h>
  57 #endif // HAVE_STRING_H
  58
  59 #ifdef    HAVE_UNISTD_H
  60 #  include <sys/types.h>
  61 #  include <unistd.h>
  62 #endif // HAVE_UNISTD_H
  63
  64 #ifdef    HAVE_SYS_SELECT_H
  65 #  include <sys/select.h>
  66 #endif // HAVE_SYS_SELECT_H
  67
  68 #ifdef    HAVE_SIGNAL_H
  69 #  include <signal.h>
  70 #endif // HAVE_SIGNAL_H
  71
  72 #ifndef   SA_NODEFER
  73 #  ifdef   SA_INTERRUPT
  74 #    define SA_NODEFER SA_INTERRUPT
  75 #  else // !SA_INTERRUPT
  76 #    define SA_NODEFER (0)
  77 #  endif // SA_INTERRUPT
  78 #endif // SA_NODEFER
  79
  80 #ifdef    HAVE_SYS_WAIT_H
  81 #  include <sys/types.h>
  82 #  include <sys/wait.h>
  83 #endif // HAVE_SYS_WAIT_H
  84
  85 #if defined(HAVE_PROCESS_H) && defined(__EMX__)
  86 #  include <process.h>
  87 #endif //   HAVE_PROCESS_H             __EMX__
  88
  89 #include "i18n.h"
  90 #include "BaseDisplay.h"
  91 #include "Timer.h"
  92
  93 #include <algorithm>
  94
  95 // X error handler to handle any and all X errors while the application is
  96 // running
  97 static Bool internal_error = False;
  98 static Window last_bad_window = None;
  99
 100 BaseDisplay *base_display;
 101
 102 static int handleXErrors(Display *d, XErrorEvent *e) {
 103 #ifdef    DEBUG
 104   char errtxt[128];
 105
 106   XGetErrorText(d, e->error_code, errtxt, 128);
 107   fprintf(stderr, i18n->getMessage(BaseDisplaySet, BaseDisplayXError,
 108                      "%s:  X error: %s(%d) opcodes %d/%d\n  resource 0x%lx\n"),
 109           base_display->getApplicationName(), errtxt, e->error_code,
 110           e->request_code, e->minor_code, e->resourceid);
 111 #endif // DEBUG
 112
 113   if (e->error_code == BadWindow) last_bad_window = e->resourceid;
 114   if (internal_error) abort();
 115
 116   return(False);
 117 }
 118
 119
 120 // signal handler to allow for proper and gentle shutdown
 121
 122 #ifndef   HAVE_SIGACTION
 123 static RETSIGTYPE signalhandler(int sig) {
 124 #else //  HAVE_SIGACTION
 125 static void signalhandler(int sig) {
 126 #endif // HAVE_SIGACTION
 127
 128   static int re_enter = 0;
 129
 130   switch (sig) {
 131   case SIGCHLD:
 132     int status;
 133     waitpid(-1, &status, WNOHANG | WUNTRACED);
 134
 135 #ifndef   HAVE_SIGACTION
 136     // assume broken, braindead sysv signal semantics
 137     signal(SIGCHLD, (RETSIGTYPE (*)(int)) signalhandler);
 138 #endif // HAVE_SIGACTION
 139
 140     break;
 141
 142   default:
 143     if (base_display->handleSignal(sig)) {
 144
 145 #ifndef   HAVE_SIGACTION
 146       // assume broken, braindead sysv signal semantics
 147       signal(sig, (RETSIGTYPE (*)(int)) signalhandler);
 148 #endif // HAVE_SIGACTION
 149
 150       return;
 151     }
 152
 153     fprintf(stderr, i18n->getMessage(BaseDisplaySet, BaseDisplaySignalCaught,
 154                                      "%s:  signal %d caught\n"),
 155             base_display->getApplicationName(), sig);
 156
 157     if (! base_display->isStartup() && ! re_enter) {
 158       internal_error = True;
 159
 160       re_enter = 1;
 161       fprintf(stderr, i18n->getMessage(BaseDisplaySet, BaseDisplayShuttingDown,
 162                                        "shutting down\n"));
 163       base_display->shutdown();
 164     }
 165
 166     if (sig != SIGTERM && sig != SIGINT) {
 167       fprintf(stderr, i18n->getMessage(BaseDisplaySet, BaseDisplayAborting,
 168                                        "aborting... dumping core\n"));
 169       abort();
 170     }
 171
 172     exit(0);
 173
 174     break;
 175   }
 176 }
 177
 178
 179 // convenience functions
 180 #ifndef    __EMX__
 181 void bexec(const char *command, char* displaystring) {
 182   if (! fork()) {
 183     setsid();
 184     putenv(displaystring);
 185     execl("/bin/sh", "/bin/sh", "-c", command, NULL);
 186     exit(0);
 187   }
 188 }
 189 #endif // !__EMX__
 190
 191 char *bstrdup(const char *s) {
 192   const int l = strlen(s) + 1;
 193   char *n = new char[l];
 194   strncpy(n, s, l);
 195   return n;
 196 }
 197
 198 BaseDisplay::BaseDisplay(const char *app_name, char *dpy_name) {
 199   application_name = bstrdup(app_name);
 200
 201   _startup = True;
 202   _shutdown = False;
 203   server_grabs = 0;
 204   last_bad_window = None;
 205
 206   ::base_display = this;
 207
 208 #ifdef    HAVE_SIGACTION
 209   struct sigaction action;
 210
 211   action.sa_handler = signalhandler;
 212   action.sa_mask = sigset_t();
 213   action.sa_flags = SA_NOCLDSTOP | SA_NODEFER;
 214
 215   sigaction(SIGPIPE, &action, NULL);
 216   sigaction(SIGSEGV, &action, NULL);
 217   sigaction(SIGFPE, &action, NULL);
 218   sigaction(SIGTERM, &action, NULL);
 219   sigaction(SIGINT, &action, NULL);
 220   sigaction(SIGCHLD, &action, NULL);
 221   sigaction(SIGHUP, &action, NULL);
 222   sigaction(SIGUSR1, &action, NULL);
 223   sigaction(SIGUSR2, &action, NULL);
 224 #else // !HAVE_SIGACTION
 225   signal(SIGPIPE, (RETSIGTYPE (*)(int)) signalhandler);
 226   signal(SIGSEGV, (RETSIGTYPE (*)(int)) signalhandler);
 227   signal(SIGFPE, (RETSIGTYPE (*)(int)) signalhandler);
 228   signal(SIGTERM, (RETSIGTYPE (*)(int)) signalhandler);
 229   signal(SIGINT, (RETSIGTYPE (*)(int)) signalhandler);
 230   signal(SIGUSR1, (RETSIGTYPE (*)(int)) signalhandler);
 231   signal(SIGUSR2, (RETSIGTYPE (*)(int)) signalhandler);
 232   signal(SIGHUP, (RETSIGTYPE (*)(int)) signalhandler);
 233   signal(SIGCHLD, (RETSIGTYPE (*)(int)) signalhandler);
 234 #endif // HAVE_SIGACTION
 235
 236   if (! (display = XOpenDisplay(dpy_name))) {
 237     fprintf(stderr, i18n->getMessage(BaseDisplaySet, BaseDisplayXConnectFail,
 238                "BaseDisplay::BaseDisplay: connection to X server failed.\n"));
 239     ::exit(2);
 240   } else if (fcntl(ConnectionNumber(display), F_SETFD, 1) == -1) {
 241     fprintf(stderr,
 242             i18n->getMessage(BaseDisplaySet, BaseDisplayCloseOnExecFail,
 243                "BaseDisplay::BaseDisplay: couldn't mark display connection "
 244                "as close-on-exec\n"));
 245     ::exit(2);
 246   }
 247
 248   number_of_screens = ScreenCount(display);
 249   display_name = XDisplayName(dpy_name);
 250
 251 #ifdef    SHAPE
 252   shape.extensions = XShapeQueryExtension(display, &shape.event_basep,
 253                                           &shape.error_basep);
 254 #else // !SHAPE
 255   shape.extensions = False;
 256 #endif // SHAPE
 257
 258   xa_wm_colormap_windows =
 259     XInternAtom(display, "WM_COLORMAP_WINDOWS", False);
 260   xa_wm_protocols = XInternAtom(display, "WM_PROTOCOLS", False);
 261   xa_wm_state = XInternAtom(display, "WM_STATE", False);
 262   xa_wm_change_state = XInternAtom(display, "WM_CHANGE_STATE", False);
 263   xa_wm_delete_window = XInternAtom(display, "WM_DELETE_WINDOW", False);
 264   xa_wm_take_focus = XInternAtom(display, "WM_TAKE_FOCUS", False);
 265   motif_wm_hints = XInternAtom(display, "_MOTIF_WM_HINTS", False);
 266
 267   openbox_hints = XInternAtom(display, "_BLACKBOX_HINTS", False);
 268   openbox_attributes = XInternAtom(display, "_BLACKBOX_ATTRIBUTES", False);
 269   openbox_change_attributes =
 270     XInternAtom(display, "_BLACKBOX_CHANGE_ATTRIBUTES", False);
 271
 272   openbox_structure_messages =
 273     XInternAtom(display, "_BLACKBOX_STRUCTURE_MESSAGES", False);
 274   openbox_notify_startup =
 275     XInternAtom(display, "_BLACKBOX_NOTIFY_STARTUP", False);
 276   openbox_notify_window_add =
 277     XInternAtom(display, "_BLACKBOX_NOTIFY_WINDOW_ADD", False);
 278   openbox_notify_window_del =
 279     XInternAtom(display, "_BLACKBOX_NOTIFY_WINDOW_DEL", False);
 280   openbox_notify_current_workspace =
 281     XInternAtom(display, "_BLACKBOX_NOTIFY_CURRENT_WORKSPACE", False);
 282   openbox_notify_workspace_count =
 283     XInternAtom(display, "_BLACKBOX_NOTIFY_WORKSPACE_COUNT", False);
 284   openbox_notify_window_focus =
 285     XInternAtom(display, "_BLACKBOX_NOTIFY_WINDOW_FOCUS", False);
 286   openbox_notify_window_raise =
 287     XInternAtom(display, "_BLACKBOX_NOTIFY_WINDOW_RAISE", False);
 288   openbox_notify_window_lower =
 289     XInternAtom(display, "_BLACKBOX_NOTIFY_WINDOW_LOWER", False);
 290
 291   openbox_change_workspace =
 292     XInternAtom(display, "_BLACKBOX_CHANGE_WORKSPACE", False);
 293   openbox_change_window_focus =
 294     XInternAtom(display, "_BLACKBOX_CHANGE_WINDOW_FOCUS", False);
 295   openbox_cycle_window_focus =
 296     XInternAtom(display, "_BLACKBOX_CYCLE_WINDOW_FOCUS", False);
 297
 298 #ifdef    NEWWMSPEC
 299
 300   net_supported = XInternAtom(display, "_NET_SUPPORTED", False);
 301   net_client_list = XInternAtom(display, "_NET_CLIENT_LIST", False);
 302   net_client_list_stacking = XInternAtom(display, "_NET_CLIENT_LIST_STACKING", False);
 303   net_number_of_desktops = XInternAtom(display, "_NET_NUMBER_OF_DESKTOPS", False);
 304   net_desktop_geometry = XInternAtom(display, "_NET_DESKTOP_GEOMETRY", False);
 305   net_desktop_viewport = XInternAtom(display, "_NET_DESKTOP_VIEWPORT", False);
 306   net_current_desktop = XInternAtom(display, "_NET_CURRENT_DESKTOP", False);
 307   net_desktop_names = XInternAtom(display, "_NET_DESKTOP_NAMES", False);
 308   net_active_window = XInternAtom(display, "_NET_ACTIVE_WINDOW", False);
 309   net_workarea = XInternAtom(display, "_NET_WORKAREA", False);
 310   net_supporting_wm_check = XInternAtom(display, "_NET_SUPPORTING_WM_CHECK", False);
 311   net_virtual_roots = XInternAtom(display, "_NET_VIRTUAL_ROOTS", False);
 312
 313   net_close_window = XInternAtom(display, "_NET_CLOSE_WINDOW", False);
 314   net_wm_moveresize = XInternAtom(display, "_NET_WM_MOVERESIZE", False);
 315
 316   net_properties = XInternAtom(display, "_NET_PROPERTIES", False);
 317   net_wm_name = XInternAtom(display, "_NET_WM_NAME", False);
 318   net_wm_desktop = XInternAtom(display, "_NET_WM_DESKTOP", False);
 319   net_wm_window_type = XInternAtom(display, "_NET_WM_WINDOW_TYPE", False);
 320   net_wm_state = XInternAtom(display, "_NET_WM_STATE", False);
 321   net_wm_strut = XInternAtom(display, "_NET_WM_STRUT", False);
 322   net_wm_icon_geometry = XInternAtom(display, "_NET_WM_ICON_GEOMETRY", False);
 323   net_wm_icon = XInternAtom(display, "_NET_WM_ICON", False);
 324   net_wm_pid = XInternAtom(display, "_NET_WM_PID", False);
 325   net_wm_handled_icons = XInternAtom(display, "_NET_WM_HANDLED_ICONS", False);
 326
 327   net_wm_ping = XInternAtom(display, "_NET_WM_PING", False);
 328
 329 #endif // NEWWMSPEC
 330
 331   cursor.session = XCreateFontCursor(display, XC_left_ptr);
 332   cursor.move = XCreateFontCursor(display, XC_fleur);
 333   cursor.ll_angle = XCreateFontCursor(display, XC_ll_angle);
 334   cursor.lr_angle = XCreateFontCursor(display, XC_lr_angle);
 335   cursor.ul_angle = XCreateFontCursor(display, XC_ul_angle);
 336   cursor.ur_angle = XCreateFontCursor(display, XC_ur_angle);
 337
 338   XSetErrorHandler((XErrorHandler) handleXErrors);
 339
 340   screenInfoList.reserve(ScreenCount(display));
 341   for (unsigned int s = 0; s < number_of_screens; s++)
 342     screenInfoList.push_back(new ScreenInfo(*this, s));
 343
 344 #ifndef   NOCLOBBER
 345   NumLockMask = ScrollLockMask = 0;
 346
 347   const XModifierKeymap* const modmap = XGetModifierMapping(display);
 348   if (modmap && modmap->max_keypermod > 0) {
 349     const int mask_table[] = {
 350       ShiftMask, LockMask, ControlMask, Mod1Mask,
 351       Mod2Mask, Mod3Mask, Mod4Mask, Mod5Mask
 352     };
 353     const size_t size = (sizeof(mask_table) / sizeof(mask_table[0])) *
 354       modmap->max_keypermod;
 355     // get the values of the keyboard lock modifiers
 356     // Note: Caps lock is not retrieved the same way as Scroll and Num lock
 357     // since it doesn't need to be.
 358     const KeyCode num_lock_code = XKeysymToKeycode(display, XK_Num_Lock);
 359     const KeyCode scroll_lock_code = XKeysymToKeycode(display, XK_Scroll_Lock);
 360
 361     for (size_t cnt = 0; cnt < size; ++cnt) {
 362       if (! modmap->modifiermap[cnt]) continue;
 363
 364       if (num_lock_code == modmap->modifiermap[cnt])
 365         NumLockMask = mask_table[cnt / modmap->max_keypermod];
 366       if (scroll_lock_code == modmap->modifiermap[cnt])
 367         ScrollLockMask = mask_table[cnt / modmap->max_keypermod];
 368     }
 369   }
 370
 371   MaskList[0] = 0;
 372   MaskList[1] = LockMask;
 373   MaskList[2] = NumLockMask;
 374   MaskList[3] = ScrollLockMask;
 375   MaskList[4] = LockMask | NumLockMask;
 376   MaskList[5] = NumLockMask  | ScrollLockMask;
 377   MaskList[6] = LockMask | ScrollLockMask;
 378   MaskList[7] = LockMask | NumLockMask | ScrollLockMask;
 379   MaskListLength = sizeof(MaskList) / sizeof(MaskList[0]);
 380
 381   if (modmap) XFreeModifiermap(const_cast<XModifierKeymap*>(modmap));
 382 #else
 383   NumLockMask = Mod2Mask;
 384   ScrollLockMask = Mod5Mask;
 385 #endif // NOCLOBBER
 386 }
 387
 388
 389 BaseDisplay::~BaseDisplay(void) {
 390   std::for_each(screenInfoList.begin(), screenInfoList.end(),
 391                 PointerAssassin());
 392   // we don't create the BTimers, we don't delete them
 393
 394   if (application_name != NULL)
 395     delete [] application_name;
 396
 397   XCloseDisplay(display);
 398 }
 399
 400
 401 void BaseDisplay::eventLoop(void) {
 402   run();
 403
 404   int xfd = ConnectionNumber(display);
 405
 406   while ((! _shutdown) && (! internal_error)) {
 407     if (XPending(display)) {
 408       XEvent e;
 409       XNextEvent(display, &e);
 410
 411       if (last_bad_window != None && e.xany.window == last_bad_window) {
 412 #ifdef    DEBUG
 413       fprintf(stderr, i18n->getMessage(BaseDisplaySet,
 414                                        BaseDisplayBadWindowRemove,
 415                          "BaseDisplay::eventLoop(): removing bad window "
 416                          "from event queue\n"));
 417 #endif // DEBUG
 418       } else {
 419         last_bad_window = None;
 420         process_event(&e);
 421       }
 422     } else {
 423       fd_set rfds;
 424       timeval now, tm, *timeout = (timeval *) 0;
 425
 426       FD_ZERO(&rfds);
 427       FD_SET(xfd, &rfds);
 428
 429       if (!timerList.empty()) {
 430         gettimeofday(&now, 0);
 431
 432         tm.tv_sec = tm.tv_usec = 0l;
 433
 434         BTimer *timer = timerList.front();
 435         ASSERT(timer != NULL);
 436
 437         tm.tv_sec = timer->getStartTime().tv_sec +
 438           timer->getTimeout().tv_sec - now.tv_sec;
 439         tm.tv_usec = timer->getStartTime().tv_usec +
 440           timer->getTimeout().tv_usec - now.tv_usec;
 441
 442         while (tm.tv_usec >= 1000000) {
 443           tm.tv_sec++;
 444           tm.tv_usec -= 1000000;
 445         }
 446
 447         while (tm.tv_usec < 0) {
 448           if (tm.tv_sec > 0) {
 449             tm.tv_sec--;
 450             tm.tv_usec += 1000000;
 451           } else {
 452             tm.tv_usec = 0;
 453             break;
 454           }
 455         }
 456
 457         timeout = &tm;
 458       }
 459
 460       select(xfd + 1, &rfds, 0, 0, timeout);
 461
 462       // check for timer timeout
 463       gettimeofday(&now, 0);
 464
 465       TimerList::iterator it;
 466       for (it = timerList.begin(); it != timerList.end(); ) {
 467         BTimer *timer = *it;
 468         ++it;   // the timer may be removed from the list, so move ahead now
 469         ASSERT(timer != NULL);
 470         tm.tv_sec = timer->getStartTime().tv_sec +
 471           timer->getTimeout().tv_sec;
 472         tm.tv_usec = timer->getStartTime().tv_usec +
 473           timer->getTimeout().tv_usec;
 474
 475         if ((now.tv_sec < tm.tv_sec) ||
 476             (now.tv_sec == tm.tv_sec && now.tv_usec < tm.tv_usec))
 477           break;
 478
 479         timer->fireTimeout();
 480
 481         // restart the current timer so that the start time is updated
 482         if (! timer->doOnce())
 483           timer->start();
 484         else {
 485           timer->stop();
 486 //          delete timer; // USE THIS?
 487         }
 488       }
 489     }
 490   }
 491 }
 492
 493
 494 const Bool BaseDisplay::validateWindow(Window window) {
 495   XEvent event;
 496   if (XCheckTypedWindowEvent(display, window, DestroyNotify, &event)) {
 497     XPutBackEvent(display, &event);
 498
 499     return False;
 500   }
 501
 502   return True;
 503 }
 504
 505
 506 void BaseDisplay::grab(void) {
 507   if (! server_grabs++)
 508     XGrabServer(display);
 509 }
 510
 511
 512 void BaseDisplay::ungrab(void) {
 513   if (! --server_grabs)
 514     XUngrabServer(display);
 515 }
 516
 517
 518 void BaseDisplay::addTimer(BTimer *timer) {
 519   ASSERT(timer != (BTimer *) 0);
 520
 521   TimerList::iterator it;
 522   for (it = timerList.begin(); it != timerList.end(); ++it) {
 523     BTimer *tmp = *it;
 524     if ((tmp->getTimeout().tv_sec > timer->getTimeout().tv_sec) ||
 525         ((tmp->getTimeout().tv_sec == timer->getTimeout().tv_sec) &&
 526          (tmp->getTimeout().tv_usec >= timer->getTimeout().tv_usec)))
 527       break;
 528   }
 529
 530   timerList.insert(it, timer);
 531 }
 532
 533
 534 void BaseDisplay::removeTimer(BTimer *timer) {
 535   timerList.remove(timer);
 536 }
 537
 538
 539 /*
 540  * Grabs a button, but also grabs the button in every possible combination with
 541  * the keyboard lock keys, so that they do not cancel out the event.
 542  */
 543 void BaseDisplay::grabButton(unsigned int button, unsigned int modifiers,
 544                              Window grab_window, Bool owner_events,
 545                              unsigned int event_mask, int pointer_mode,
 546                              int keybaord_mode, Window confine_to,
 547                              Cursor cursor) const
 548 {
 549 #ifndef   NOCLOBBER
 550   for (size_t cnt = 0; cnt < MaskListLength; ++cnt)
 551     XGrabButton(display, button, modifiers | MaskList[cnt], grab_window,
 552                 owner_events, event_mask, pointer_mode, keybaord_mode,
 553                 confine_to, cursor);
 554 #else  // NOCLOBBER
 555     XGrabButton(display, button, modifiers, grab_window,
 556                 owner_events, event_mask, pointer_mode, keybaord_mode,
 557                 confine_to, cursor);
 558 #endif // NOCLOBBER
 559 }
 560
 561 /*
 562  * Releases the grab on a button, and ungrabs all possible combinations of the
 563  * keyboard lock keys.
 564  */
 565 void BaseDisplay::ungrabButton(unsigned int button, unsigned int modifiers,
 566                                Window grab_window) const {
 567 #ifndef   NOCLOBBER
 568   for (size_t cnt = 0; cnt < MaskListLength; ++cnt)
 569     XUngrabButton(display, button, modifiers | MaskList[cnt], grab_window);
 570 #else  // NOCLOBBER
 571     XUngrabButton(display, button, modifiers, grab_window);
 572 #endif // NOCLOBBER
 573 }
 574
 575
 576 ScreenInfo::ScreenInfo(BaseDisplay &d, int num) : basedisplay(d),
 577   screen_number(num)
 578 {
 579
 580   root_window = RootWindow(basedisplay.getXDisplay(), screen_number);
 581   depth = DefaultDepth(basedisplay.getXDisplay(), screen_number);
 582
 583   m_size = Size(WidthOfScreen(ScreenOfDisplay(basedisplay.getXDisplay(),
 584                                               screen_number)),
 585                 HeightOfScreen(ScreenOfDisplay(basedisplay.getXDisplay(),
 586                                                screen_number)));
 587
 588   // search for a TrueColor Visual... if we can't find one... we will use the
 589   // default visual for the screen
 590   XVisualInfo vinfo_template, *vinfo_return;
 591   int vinfo_nitems;
 592
 593   vinfo_template.screen = screen_number;
 594   vinfo_template.c_class = TrueColor;
 595
 596   visual = (Visual *) 0;
 597
 598   if ((vinfo_return = XGetVisualInfo(basedisplay.getXDisplay(),
 599                                      VisualScreenMask | VisualClassMask,
 600                                      &vinfo_template, &vinfo_nitems)) &&
 601       vinfo_nitems > 0) {
 602     for (int i = 0; i < vinfo_nitems; i++) {
 603       if (depth < (vinfo_return + i)->depth) {
 604         depth = (vinfo_return + i)->depth;
 605         visual = (vinfo_return + i)->visual;
 606       }
 607     }
 608
 609     XFree(vinfo_return);
 610   }
 611
 612   if (visual) {
 613     colormap = XCreateColormap(basedisplay.getXDisplay(), root_window,
 614                                visual, AllocNone);
 615   } else {
 616     visual = DefaultVisual(basedisplay.getXDisplay(), screen_number);
 617     colormap = DefaultColormap(basedisplay.getXDisplay(), screen_number);
 618   }
 619 }