Dogcows Code - chaz/openbox/blob - util/epist/screen.cc

   1 // -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*-
   2 // screen.cc for Epistrophy - a key handler for NETWM/EWMH window managers.
   3 // Copyright (c) 2002 - 2002 Ben Jansens <ben at orodu.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 /* A few comments about stacked cycling:
  24  * When stacked cycling is turned on, the focused window is always at the top
  25  * (front) of the list (_clients), EXCEPT for when we are in cycling mode.
  26  * (_cycling is true) If we were to add the focused window to the top of the
  27  * stack while we were cycling, we would end in a deadlock between 2 windows.
  28  * When the modifiers are released, the window that has focus (but it's not
  29  * at the top of the stack, since we are cycling) is placed at the top of the
  30  * stack and raised.
  31  * Hooray and Bummy. - Marius
  32  */
  33
  34 #ifdef    HAVE_CONFIG_H
  35 #  include "../../config.h"
  36 #endif // HAVE_CONFIG_H
  37
  38 extern "C" {
  39 #ifdef    HAVE_STDIO_H
  40 #  include <stdio.h>
  41 #endif // HAVE_STDIO_H
  42
  43 #ifdef    HAVE_UNISTD_H
  44 #  include <sys/types.h>
  45 #  include <unistd.h>
  46 #endif // HAVE_UNISTD_H
  47
  48 #include <X11/keysym.h>
  49 }
  50
  51 #include <iostream>
  52 #include <string>
  53
  54 using std::cout;
  55 using std::endl;
  56 using std::hex;
  57 using std::dec;
  58 using std::string;
  59
  60 #include "../../src/BaseDisplay.hh"
  61 #include "../../src/XAtom.hh"
  62 #include "screen.hh"
  63 #include "epist.hh"
  64 #include "config.hh"
  65
  66 screen::screen(epist *epist, int number)
  67   : _clients(epist->clientsList()), _active(epist->activeWindow()),
  68     _config(epist->getConfig()), _grabbed(true), _cycling(false),
  69     _stacked_cycling(false)
  70 {
  71   _epist = epist;
  72   _xatom = _epist->xatom();
  73   _last_active = _clients.end();
  74   _number = number;
  75   _info = _epist->getScreenInfo(_number);
  76   _root = _info->getRootWindow();
  77
  78   _config->getValue(Config::stackedCycling, _stacked_cycling);
  79
  80   // find a window manager supporting NETWM, waiting for it to load if we must
  81   int count = 20;  // try for 20 seconds
  82   _managed = false;
  83   while (! (_epist->doShutdown() || _managed || count <= 0)) {
  84     if (! (_managed = findSupportingWM()))
  85       sleep(1);
  86     --count;
  87   }
  88   if (_managed)
  89     cout << "Found compatible window manager '" << _wm_name << "' for screen "
  90          << _number << ".\n";
  91   else {
  92     cout << "Unable to find a compatible window manager for screen " <<
  93       _number << ".\n";
  94     return;
  95   }
  96
  97   XSelectInput(_epist->getXDisplay(), _root, PropertyChangeMask);
  98 }
  99
 100 screen::~screen() {
 101   if (_managed)
 102     XSelectInput(_epist->getXDisplay(), _root, None);
 103 }
 104
 105
 106 bool screen::findSupportingWM() {
 107   Window support_win;
 108   if (! _xatom->getValue(_root, XAtom::net_supporting_wm_check, XAtom::window,
 109                          support_win) || support_win == None)
 110     return false;
 111
 112   string title;
 113   _xatom->getValue(support_win, XAtom::net_wm_name, XAtom::utf8, title);
 114   _wm_name = title;
 115   return true;
 116 }
 117
 118
 119 XWindow *screen::findWindow(const XEvent &e) const {
 120   assert(_managed);
 121
 122   WindowList::const_iterator it, end = _clients.end();
 123   for (it = _clients.begin(); it != end; ++it)
 124     if (**it == e.xany.window)
 125       break;
 126   if(it == end)
 127     return 0;
 128   return *it;
 129 }
 130
 131
 132 void screen::processEvent(const XEvent &e) {
 133   assert(_managed);
 134   assert(e.xany.window == _root);
 135
 136   switch (e.type) {
 137   case PropertyNotify:
 138     // root window
 139     if (e.xproperty.atom == _xatom->getAtom(XAtom::net_number_of_desktops))
 140       updateNumDesktops();
 141     else if (e.xproperty.atom == _xatom->getAtom(XAtom::net_current_desktop))
 142       updateActiveDesktop();
 143     else if (e.xproperty.atom == _xatom->getAtom(XAtom::net_active_window))
 144       updateActiveWindow();
 145     else if (e.xproperty.atom == _xatom->getAtom(XAtom::net_client_list)) {
 146       // catch any window unmaps first
 147       XEvent ev;
 148       if (XCheckTypedWindowEvent(_epist->getXDisplay(), e.xany.window,
 149                                  DestroyNotify, &ev) ||
 150           XCheckTypedWindowEvent(_epist->getXDisplay(), e.xany.window,
 151                                  UnmapNotify, &ev)) {
 152
 153         XWindow *win = _epist->findWindow(e.xany.window);
 154         if (win) win->processEvent(ev);
 155       }
 156
 157       updateClientList();
 158     }
 159     break;
 160   case KeyPress:
 161     handleKeypress(e);
 162     break;
 163
 164   case KeyRelease:
 165     handleKeyrelease(e);
 166     break;
 167
 168   default:
 169     break;
 170   }
 171 }
 172
 173 void screen::handleKeypress(const XEvent &e) {
 174   int scrolllockMask, numlockMask;
 175   _epist->getLockModifiers(numlockMask, scrolllockMask);
 176
 177   // Mask out the lock modifiers. We want our keys to always work
 178   // This should be made an option
 179   unsigned int state = e.xkey.state & ~(LockMask|scrolllockMask|numlockMask);
 180   keytree &ktree = _epist->getKeyTree();
 181   const Action *it = ktree.getAction(e, state, this);
 182
 183   if (!it)
 184     return;
 185
 186   switch (it->type()) {
 187   case Action::nextScreen:
 188     _epist->cycleScreen(_number, true);
 189     return;
 190
 191   case Action::prevScreen:
 192     _epist->cycleScreen(_number, false);
 193     return;
 194
 195   case Action::nextWorkspace:
 196     cycleWorkspace(true, it->number() != 0 ? it->number(): 1);
 197     return;
 198
 199   case Action::prevWorkspace:
 200     cycleWorkspace(false, it->number() != 0 ? it->number(): 1);
 201     return;
 202
 203   case Action::nextWindow:
 204
 205     cycleWindow(state, true, it->number() != 0 ? it->number(): 1);
 206     return;
 207
 208   case Action::prevWindow:
 209     cycleWindow(state, false, it->number() != 0 ? it->number(): 1);
 210     return;
 211
 212   case Action::nextWindowOnAllWorkspaces:
 213     cycleWindow(state, true, it->number() != 0 ? it->number(): 1,  false, true);
 214     return;
 215
 216   case Action::prevWindowOnAllWorkspaces:
 217     cycleWindow(state, false, it->number() != 0 ? it->number(): 1, false, true);
 218     return;
 219
 220   case Action::nextWindowOnAllScreens:
 221     cycleWindow(state, true, it->number() != 0 ? it->number(): 1, true);
 222     return;
 223
 224   case Action::prevWindowOnAllScreens:
 225     cycleWindow(state, false, it->number() != 0 ? it->number(): 1, true);
 226     return;
 227
 228   case Action::nextWindowOfClass:
 229     cycleWindow(state, true, it->number() != 0 ? it->number(): 1,
 230                 false, false, true, it->string());
 231     return;
 232
 233   case Action::prevWindowOfClass:
 234     cycleWindow(state, false, it->number() != 0 ? it->number(): 1,
 235                 false, false, true, it->string());
 236     return;
 237
 238   case Action::nextWindowOfClassOnAllWorkspaces:
 239     cycleWindow(state, true, it->number() != 0 ? it->number(): 1,
 240                 false, true, true, it->string());
 241     return;
 242
 243   case Action::prevWindowOfClassOnAllWorkspaces:
 244     cycleWindow(state, false, it->number() != 0 ? it->number(): 1,
 245                 false, true, true, it->string());
 246     return;
 247
 248   case Action::changeWorkspace:
 249     changeWorkspace(it->number());
 250     return;
 251
 252   case Action::upWorkspace:
 253     changeWorkspaceVert(-1);
 254     return;
 255
 256   case Action::downWorkspace:
 257     changeWorkspaceVert(1);
 258     return;
 259
 260   case Action::leftWorkspace:
 261     changeWorkspaceHorz(-1);
 262     return;
 263
 264   case Action::rightWorkspace:
 265     changeWorkspaceHorz(1);
 266     return;
 267
 268   case Action::execute:
 269     execCommand(it->string());
 270     return;
 271
 272   case Action::showRootMenu:
 273     _xatom->sendClientMessage(rootWindow(), XAtom::openbox_show_root_menu,
 274                               None);
 275     return;
 276
 277   case Action::showWorkspaceMenu:
 278     _xatom->sendClientMessage(rootWindow(), XAtom::openbox_show_workspace_menu,
 279                               None);
 280     return;
 281
 282   case Action::toggleGrabs: {
 283     if (_grabbed) {
 284       ktree.ungrabDefaults(this);
 285       _grabbed = false;
 286     } else {
 287       ktree.grabDefaults(this);
 288       _grabbed = true;
 289     }
 290     return;
 291   }
 292
 293   default:
 294     break;
 295   }
 296
 297   // these actions require an active window
 298   if (_active != _clients.end()) {
 299     XWindow *window = *_active;
 300
 301     switch (it->type()) {
 302     case Action::iconify:
 303       window->iconify();
 304       return;
 305
 306     case Action::close:
 307       window->close();
 308       return;
 309
 310     case Action::raise:
 311       window->raise();
 312       return;
 313
 314     case Action::lower:
 315       window->lower();
 316       return;
 317
 318     case Action::sendToWorkspace:
 319       window->sendTo(it->number());
 320       return;
 321
 322     case Action::toggleOmnipresent:
 323       if (window->desktop() == 0xffffffff)
 324         window->sendTo(_active_desktop);
 325       else
 326         window->sendTo(0xffffffff);
 327       return;
 328
 329     case Action::moveWindowUp:
 330       window->move(window->x(), window->y() -
 331                    (it->number() != 0 ? it->number(): 1));
 332       return;
 333
 334     case Action::moveWindowDown:
 335       window->move(window->x(), window->y() +
 336                    (it->number() != 0 ? it->number(): 1));
 337       return;
 338
 339     case Action::moveWindowLeft:
 340       window->move(window->x() - (it->number() != 0 ? it->number(): 1),
 341                    window->y());
 342       return;
 343
 344     case Action::moveWindowRight:
 345       window->move(window->x() + (it->number() != 0 ? it->number(): 1),
 346                    window->y());
 347       return;
 348
 349     case Action::resizeWindowWidth:
 350       window->resizeRel(it->number(), 0);
 351       return;
 352
 353     case Action::resizeWindowHeight:
 354       window->resizeRel(0, it->number());
 355       return;
 356
 357     case Action::toggleShade:
 358       window->shade(! window->shaded());
 359       return;
 360
 361     case Action::toggleMaximizeHorizontal:
 362       window->toggleMaximize(XWindow::Max_Horz);
 363       return;
 364
 365     case Action::toggleMaximizeVertical:
 366       window->toggleMaximize(XWindow::Max_Vert);
 367       return;
 368
 369     case Action::toggleMaximizeFull:
 370       window->toggleMaximize(XWindow::Max_Full);
 371       return;
 372
 373     case Action::toggleDecorations:
 374       window->decorate(! window->decorated());
 375       return;
 376
 377     default:
 378       assert(false);  // unhandled action type!
 379       break;
 380     }
 381   }
 382 }
 383
 384
 385 void screen::handleKeyrelease(const XEvent &) {
 386   // the only keyrelease event we care about (for now) is when we do stacked
 387   // cycling and the modifier is released
 388   if (_stacked_cycling && _cycling && nothingIsPressed()) {
 389     // all modifiers have been released. ungrab the keyboard, move the
 390     // focused window to the top of the Z-order and raise it
 391     ungrabModifiers();
 392
 393     if (_active != _clients.end()) {
 394       XWindow *w = *_active;
 395       bool e = _last_active == _active;
 396       _clients.remove(w);
 397       _clients.push_front(w);
 398       _active = _clients.begin();
 399       if (e) _last_active = _active;
 400       w->raise();
 401     }
 402
 403     _cycling = false;
 404   }
 405 }
 406
 407
 408 // do we want to add this window to our list?
 409 bool screen::doAddWindow(Window window) const {
 410   assert(_managed);
 411
 412   Atom type;
 413   if (! _xatom->getValue(window, XAtom::net_wm_window_type, XAtom::atom,
 414                          type))
 415     return True;
 416
 417   if (type == _xatom->getAtom(XAtom::net_wm_window_type_dock) ||
 418       type == _xatom->getAtom(XAtom::net_wm_window_type_menu))
 419     return False;
 420
 421   return True;
 422 }
 423
 424
 425 void screen::updateEverything() {
 426   updateNumDesktops();
 427   updateActiveDesktop();
 428   updateClientList();
 429   updateActiveWindow();
 430 }
 431
 432
 433 void screen::updateNumDesktops() {
 434   assert(_managed);
 435
 436   if (! _xatom->getValue(_root, XAtom::net_number_of_desktops, XAtom::cardinal,
 437                          (unsigned long)_num_desktops))
 438     _num_desktops = 1;  // assume that there is at least 1 desktop!
 439 }
 440
 441
 442 void screen::updateActiveDesktop() {
 443   assert(_managed);
 444
 445   if (! _xatom->getValue(_root, XAtom::net_current_desktop, XAtom::cardinal,
 446                          (unsigned long)_active_desktop))
 447     _active_desktop = 0;  // there must be at least one desktop, and it must
 448                           // be the current one
 449 }
 450
 451
 452 void screen::updateClientList() {
 453   assert(_managed);
 454
 455   WindowList::iterator insert_point = _active;
 456   if (insert_point != _clients.end())
 457     ++insert_point; // get to the item client the focused client
 458
 459   // get the client list from the root window
 460   Window *rootclients = 0;
 461   unsigned long num = (unsigned) -1;
 462   if (! _xatom->getValue(_root, XAtom::net_client_list, XAtom::window, num,
 463                          &rootclients))
 464     num = 0;
 465
 466   WindowList::iterator it;
 467   const WindowList::iterator end = _clients.end();
 468   unsigned long i;
 469
 470   for (i = 0; i < num; ++i) {
 471     for (it = _clients.begin(); it != end; ++it)
 472       if (**it == rootclients[i])
 473         break;
 474     if (it == end) {  // didn't already exist
 475       if (doAddWindow(rootclients[i])) {
 476 //        cout << "Added window: 0x" << hex << rootclients[i] << dec << endl;
 477         // insert new clients after the active window
 478         _clients.insert(insert_point, new XWindow(_epist, this,
 479                                                   rootclients[i]));
 480       }
 481     }
 482   }
 483
 484   // remove clients that no longer exist (that belong to this screen)
 485   for (it = _clients.begin(); it != end;) {
 486     WindowList::iterator it2 = it;
 487     ++it;
 488
 489     // is on another screen?
 490     if ((*it2)->getScreen() != this)
 491       continue;
 492
 493     for (i = 0; i < num; ++i)
 494       if (**it2 == rootclients[i])
 495         break;
 496     if (i == num)  { // no longer exists
 497       //      cout << "Removed window: 0x" << hex << (*it2)->window() << dec << endl;
 498       // watch for the active and last-active window
 499       if (it2 == _active)
 500         _active = _clients.end();
 501       if (it2 == _last_active)
 502         _last_active = _clients.end();
 503       delete *it2;
 504       _clients.erase(it2);
 505     }
 506   }
 507
 508   if (rootclients) delete [] rootclients;
 509 }
 510
 511
 512 const XWindow *screen::lastActiveWindow() const {
 513   if (_last_active != _clients.end())
 514     return *_last_active;
 515
 516   // find a window if one exists
 517   WindowList::const_iterator it, end = _clients.end();
 518   for (it = _clients.begin(); it != end; ++it)
 519     if ((*it)->getScreen() == this && ! (*it)->iconic() &&
 520         (*it)->canFocus() &&
 521         ((*it)->desktop() == 0xffffffff ||
 522          (*it)->desktop() == _active_desktop))
 523       return *it;
 524
 525   // no windows on this screen
 526   return 0;
 527 }
 528
 529
 530 void screen::updateActiveWindow() {
 531   assert(_managed);
 532
 533   Window a = None;
 534   _xatom->getValue(_root, XAtom::net_active_window, XAtom::window, a);
 535
 536   WindowList::iterator it, end = _clients.end();
 537   for (it = _clients.begin(); it != end; ++it) {
 538     if (**it == a) {
 539       if ((*it)->getScreen() != this)
 540         return;
 541       break;
 542     }
 543   }
 544
 545   _active = it;
 546
 547   if (_active != end) {
 548     /* if we're not cycling and a window gets focus, add it to the top of the
 549      * cycle stack.
 550      */
 551     if (_stacked_cycling && !_cycling) {
 552       XWindow *win = *_active;
 553       _clients.remove(win);
 554       _clients.push_front(win);
 555       _active = _clients.begin();
 556
 557       _last_active = _active;
 558     }
 559   }
 560
 561   /*  cout << "Active window is now: ";
 562       if (_active == _clients.end()) cout << "None\n";
 563       else cout << "0x" << hex << (*_active)->window() << dec << endl;
 564   */
 565 }
 566
 567
 568 void screen::execCommand(const string &cmd) const {
 569   pid_t pid;
 570   if ((pid = fork()) == 0) {
 571     // disconnect the child from epist's session and the tty
 572     if (setsid() == -1) {
 573       cout << "warning: could not start a new process group\n";
 574       perror("setsid");
 575     }
 576
 577     // make the command run on the correct screen
 578     if (putenv(const_cast<char*>(_info->displayString().c_str()))) {
 579       cout << "warning: couldn't set environment variable 'DISPLAY'\n";
 580       perror("putenv()");
 581     }
 582     execl("/bin/sh", "sh", "-c", cmd.c_str(), NULL);
 583     exit(-1);
 584   } else if (pid == -1) {
 585     cout << _epist->getApplicationName() <<
 586       ": Could not fork a process for executing a command\n";
 587   }
 588 }
 589
 590
 591 void screen::cycleWindow(unsigned int state, const bool forward,
 592                          const int increment, const bool allscreens,
 593                          const bool alldesktops, const bool sameclass,
 594                          const string &cn)
 595 {
 596   assert(_managed);
 597   assert(increment > 0);
 598
 599   if (_clients.empty()) return;
 600
 601   string classname(cn);
 602   if (sameclass && classname.empty() && _active != _clients.end())
 603     classname = (*_active)->appClass();
 604
 605   WindowList::const_iterator target = _active,
 606     begin = _clients.begin(),
 607     end = _clients.end();
 608
 609   XWindow *t = 0;
 610
 611   for (int x = 0; x < increment; ++x) {
 612     while (1) {
 613       if (forward) {
 614         if (target == end) {
 615           target = begin;
 616         } else {
 617           ++target;
 618         }
 619       } else {
 620         if (target == begin)
 621           target = end;
 622         --target;
 623       }
 624
 625       // must be no window to focus
 626       if (target == _active)
 627         return;
 628
 629       // start back at the beginning of the loop
 630       if (target == end)
 631         continue;
 632
 633       // determine if this window is invalid for cycling to
 634       t = *target;
 635       if (t->iconic()) continue;
 636       if (! allscreens && t->getScreen() != this) continue;
 637       if (! alldesktops && ! (t->desktop() == _active_desktop ||
 638                               t->desktop() == 0xffffffff)) continue;
 639       if (sameclass && ! classname.empty() &&
 640           t->appClass() != classname) continue;
 641       if (! t->canFocus()) continue;
 642
 643       // found a good window so break out of the while, and perhaps continue
 644       // with the for loop
 645       break;
 646     }
 647   }
 648
 649   // phew. we found the window, so focus it.
 650   if (_stacked_cycling && state) {
 651     if (!_cycling) {
 652       // grab modifiers so we can intercept KeyReleases from them
 653       grabModifiers();
 654       _cycling = true;
 655     }
 656
 657     // if the window is on another desktop, we can't use XSetInputFocus, since
 658     // it doesn't imply a workspace change.
 659     if (t->desktop() == _active_desktop || t->desktop() == 0xffffffff)
 660       t->focus(false); // focus, but don't raise
 661     else
 662       t->focus(); // change workspace and focus
 663   }
 664   else {
 665     t->focus();
 666   }
 667 }
 668
 669
 670 void screen::cycleWorkspace(const bool forward, const int increment,
 671                             const bool loop) const {
 672   assert(_managed);
 673   assert(increment > 0);
 674
 675   unsigned int destination = _active_desktop;
 676
 677   for (int x = 0; x < increment; ++x) {
 678     if (forward) {
 679       if (destination < _num_desktops - 1)
 680         ++destination;
 681       else if (loop)
 682         destination = 0;
 683     } else {
 684       if (destination > 0)
 685         --destination;
 686       else if (loop)
 687         destination = _num_desktops - 1;
 688     }
 689   }
 690
 691   if (destination != _active_desktop)
 692     changeWorkspace(destination);
 693 }
 694
 695
 696 void screen::changeWorkspace(const int num) const {
 697   assert(_managed);
 698
 699   _xatom->sendClientMessage(_root, XAtom::net_current_desktop, _root, num);
 700 }
 701
 702 void screen::changeWorkspaceVert(const int num) const {
 703   assert(_managed);
 704   int width = 0;
 705   int num_desktops = (signed)_num_desktops;
 706   int active_desktop = (signed)_active_desktop;
 707   int wnum = 0;
 708
 709   _config->getValue(Config::workspaceColumns, width);
 710
 711   if (width > num_desktops || width <= 0)
 712     return;
 713
 714   // a cookie to the person that makes this pretty
 715   if (num < 0) {
 716     wnum = active_desktop - width;
 717     if (wnum < 0) {
 718       wnum = num_desktops/width * width + active_desktop;
 719       if (wnum >= num_desktops)
 720         wnum = num_desktops - 1;
 721     }
 722   }
 723   else {
 724     wnum = active_desktop + width;
 725     if (wnum >= num_desktops) {
 726       wnum = (active_desktop + width) % num_desktops - 1;
 727       if (wnum < 0)
 728         wnum = 0;
 729     }
 730   }
 731   changeWorkspace(wnum);
 732 }
 733
 734 void screen::changeWorkspaceHorz(const int num) const {
 735   assert(_managed);
 736   int width = 0;
 737   int num_desktops = (signed)_num_desktops;
 738   int active_desktop = (signed)_active_desktop;
 739   int wnum = 0;
 740
 741   _config->getValue(Config::workspaceColumns, width);
 742
 743   if (width > num_desktops || width <= 0)
 744     return;
 745
 746   if (num < 0) {
 747     if (active_desktop % width != 0)
 748       changeWorkspace(active_desktop - 1);
 749     else {
 750       wnum = active_desktop + width - 1;
 751       if (wnum >= num_desktops)
 752         wnum = num_desktops - 1;
 753     }
 754   }
 755   else {
 756     if (active_desktop % width != width - 1) {
 757       wnum = active_desktop + 1;
 758       if (wnum >= num_desktops)
 759         wnum = num_desktops / width * width;
 760     }
 761     else
 762       wnum = active_desktop - width + 1;
 763   }
 764   changeWorkspace(wnum);
 765 }
 766
 767 void screen::grabKey(const KeyCode keyCode, const int modifierMask) const {
 768
 769   Display *display = _epist->getXDisplay();
 770   int numlockMask, scrolllockMask;
 771
 772   _epist->getLockModifiers(numlockMask, scrolllockMask);
 773
 774   XGrabKey(display, keyCode, modifierMask,
 775            _root, True, GrabModeAsync, GrabModeAsync);
 776   XGrabKey(display, keyCode,
 777            modifierMask|LockMask,
 778            _root, True, GrabModeAsync, GrabModeAsync);
 779   XGrabKey(display, keyCode,
 780            modifierMask|scrolllockMask,
 781            _root, True, GrabModeAsync, GrabModeAsync);
 782   XGrabKey(display, keyCode,
 783            modifierMask|numlockMask,
 784            _root, True, GrabModeAsync, GrabModeAsync);
 785
 786   XGrabKey(display, keyCode,
 787            modifierMask|LockMask|scrolllockMask,
 788            _root, True, GrabModeAsync, GrabModeAsync);
 789   XGrabKey(display, keyCode,
 790            modifierMask|scrolllockMask|numlockMask,
 791            _root, True, GrabModeAsync, GrabModeAsync);
 792   XGrabKey(display, keyCode,
 793            modifierMask|numlockMask|LockMask,
 794            _root, True, GrabModeAsync, GrabModeAsync);
 795
 796   XGrabKey(display, keyCode,
 797            modifierMask|numlockMask|LockMask|scrolllockMask,
 798            _root, True, GrabModeAsync, GrabModeAsync);
 799 }
 800
 801 void screen::ungrabKey(const KeyCode keyCode, const int modifierMask) const {
 802
 803   Display *display = _epist->getXDisplay();
 804   int numlockMask, scrolllockMask;
 805
 806   _epist->getLockModifiers(numlockMask, scrolllockMask);
 807
 808   XUngrabKey(display, keyCode, modifierMask, _root);
 809   XUngrabKey(display, keyCode, modifierMask|LockMask, _root);
 810   XUngrabKey(display, keyCode, modifierMask|scrolllockMask, _root);
 811   XUngrabKey(display, keyCode, modifierMask|numlockMask, _root);
 812   XUngrabKey(display, keyCode, modifierMask|LockMask|scrolllockMask, _root);
 813   XUngrabKey(display, keyCode, modifierMask|scrolllockMask|numlockMask, _root);
 814   XUngrabKey(display, keyCode, modifierMask|numlockMask|LockMask, _root);
 815   XUngrabKey(display, keyCode, modifierMask|numlockMask|LockMask|
 816              scrolllockMask, _root);
 817 }
 818
 819
 820 void screen::grabModifiers() const {
 821   Display *display = _epist->getXDisplay();
 822
 823   XGrabKeyboard(display, rootWindow(), True, GrabModeAsync,
 824                 GrabModeAsync, CurrentTime);
 825 }
 826
 827
 828 void screen::ungrabModifiers() const {
 829   Display *display = _epist->getXDisplay();
 830
 831   XUngrabKeyboard(display, CurrentTime);
 832 }
 833
 834
 835 bool screen::nothingIsPressed(void) const
 836 {
 837   char keys[32];
 838   XQueryKeymap(_epist->getXDisplay(), keys);
 839
 840   for (int i = 0; i < 32; ++i) {
 841     if (keys[i] != 0)
 842       return false;
 843   }
 844
 845   return true;
 846 }