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), _stacked_raise(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   if (_stacked_cycling)
  80     _config->getValue(Config::stackedCyclingRaise, _stacked_raise);
  81
  82   // find a window manager supporting NETWM, waiting for it to load if we must
  83   int count = 20;  // try for 20 seconds
  84   _managed = false;
  85   while (! (_epist->doShutdown() || _managed || count <= 0)) {
  86     if (! (_managed = findSupportingWM()))
  87       sleep(1);
  88     --count;
  89   }
  90   if (_managed)
  91     cout << "Found compatible window manager '" << _wm_name << "' for screen "
  92          << _number << ".\n";
  93   else {
  94     cout << "Unable to find a compatible window manager for screen " <<
  95       _number << ".\n";
  96     return;
  97   }
  98
  99   XSelectInput(_epist->getXDisplay(), _root, PropertyChangeMask);
 100 }
 101
 102 screen::~screen() {
 103   if (_managed)
 104     XSelectInput(_epist->getXDisplay(), _root, None);
 105 }
 106
 107
 108 bool screen::findSupportingWM() {
 109   Window support_win;
 110   if (! _xatom->getValue(_root, XAtom::net_supporting_wm_check, XAtom::window,
 111                          support_win) || support_win == None)
 112     return false;
 113
 114   string title;
 115   _xatom->getValue(support_win, XAtom::net_wm_name, XAtom::utf8, title);
 116   _wm_name = title;
 117   return true;
 118 }
 119
 120
 121 XWindow *screen::findWindow(const XEvent &e) const {
 122   assert(_managed);
 123
 124   WindowList::const_iterator it, end = _clients.end();
 125   for (it = _clients.begin(); it != end; ++it)
 126     if (**it == e.xany.window)
 127       break;
 128   if(it == end)
 129     return 0;
 130   return *it;
 131 }
 132
 133
 134 void screen::processEvent(const XEvent &e) {
 135   assert(_managed);
 136   assert(e.xany.window == _root);
 137
 138   switch (e.type) {
 139   case PropertyNotify:
 140     // root window
 141     if (e.xproperty.atom == _xatom->getAtom(XAtom::net_number_of_desktops))
 142       updateNumDesktops();
 143     else if (e.xproperty.atom == _xatom->getAtom(XAtom::net_current_desktop))
 144       updateActiveDesktop();
 145     else if (e.xproperty.atom == _xatom->getAtom(XAtom::net_active_window))
 146       updateActiveWindow();
 147     else if (e.xproperty.atom == _xatom->getAtom(XAtom::net_client_list)) {
 148       // catch any window unmaps first
 149       XEvent ev;
 150       if (XCheckTypedWindowEvent(_epist->getXDisplay(), e.xany.window,
 151                                  DestroyNotify, &ev) ||
 152           XCheckTypedWindowEvent(_epist->getXDisplay(), e.xany.window,
 153                                  UnmapNotify, &ev)) {
 154
 155         XWindow *win = _epist->findWindow(e.xany.window);
 156         if (win) win->processEvent(ev);
 157       }
 158
 159       updateClientList();
 160     }
 161     break;
 162   case KeyPress:
 163     handleKeypress(e);
 164     break;
 165
 166   case KeyRelease:
 167     handleKeyrelease(e);
 168     break;
 169
 170   default:
 171     break;
 172   }
 173 }
 174
 175 void screen::handleKeypress(const XEvent &e) {
 176   int scrolllockMask, numlockMask;
 177   _epist->getLockModifiers(numlockMask, scrolllockMask);
 178
 179   // Mask out the lock modifiers. We want our keys to always work
 180   // This should be made an option
 181   unsigned int state = e.xkey.state & ~(LockMask|scrolllockMask|numlockMask);
 182   keytree &ktree = _epist->getKeyTree();
 183   const Action *it = ktree.getAction(e, state, this);
 184
 185   if (!it)
 186     return;
 187
 188   switch (it->type()) {
 189   case Action::nextScreen:
 190     _epist->cycleScreen(_number, true);
 191     return;
 192
 193   case Action::prevScreen:
 194     _epist->cycleScreen(_number, false);
 195     return;
 196
 197   case Action::nextWorkspace:
 198     cycleWorkspace(true, it->number() != 0 ? it->number(): 1);
 199     return;
 200
 201   case Action::prevWorkspace:
 202     cycleWorkspace(false, it->number() != 0 ? it->number(): 1);
 203     return;
 204
 205   case Action::nextWindow:
 206
 207     cycleWindow(state, true, it->number() != 0 ? it->number(): 1);
 208     return;
 209
 210   case Action::prevWindow:
 211     cycleWindow(state, false, it->number() != 0 ? it->number(): 1);
 212     return;
 213
 214   case Action::nextWindowOnAllWorkspaces:
 215     cycleWindow(state, true, it->number() != 0 ? it->number(): 1,  false, true);
 216     return;
 217
 218   case Action::prevWindowOnAllWorkspaces:
 219     cycleWindow(state, false, it->number() != 0 ? it->number(): 1, false, true);
 220     return;
 221
 222   case Action::nextWindowOnAllScreens:
 223     cycleWindow(state, true, it->number() != 0 ? it->number(): 1, true);
 224     return;
 225
 226   case Action::prevWindowOnAllScreens:
 227     cycleWindow(state, false, it->number() != 0 ? it->number(): 1, true);
 228     return;
 229
 230   case Action::nextWindowOfClass:
 231     cycleWindow(state, true, it->number() != 0 ? it->number(): 1,
 232                 false, false, true, it->string());
 233     return;
 234
 235   case Action::prevWindowOfClass:
 236     cycleWindow(state, false, it->number() != 0 ? it->number(): 1,
 237                 false, false, true, it->string());
 238     return;
 239
 240   case Action::nextWindowOfClassOnAllWorkspaces:
 241     cycleWindow(state, true, it->number() != 0 ? it->number(): 1,
 242                 false, true, true, it->string());
 243     return;
 244
 245   case Action::prevWindowOfClassOnAllWorkspaces:
 246     cycleWindow(state, false, it->number() != 0 ? it->number(): 1,
 247                 false, true, true, it->string());
 248     return;
 249
 250   case Action::changeWorkspace:
 251     changeWorkspace(it->number());
 252     return;
 253
 254   case Action::upWorkspace:
 255     changeWorkspaceVert(-1);
 256     return;
 257
 258   case Action::downWorkspace:
 259     changeWorkspaceVert(1);
 260     return;
 261
 262   case Action::leftWorkspace:
 263     changeWorkspaceHorz(-1);
 264     return;
 265
 266   case Action::rightWorkspace:
 267     changeWorkspaceHorz(1);
 268     return;
 269
 270   case Action::execute:
 271     execCommand(it->string());
 272     return;
 273
 274   case Action::showRootMenu:
 275     _xatom->sendClientMessage(rootWindow(), XAtom::openbox_show_root_menu,
 276                               None);
 277     return;
 278
 279   case Action::showWorkspaceMenu:
 280     _xatom->sendClientMessage(rootWindow(), XAtom::openbox_show_workspace_menu,
 281                               None);
 282     return;
 283
 284   case Action::toggleGrabs: {
 285     if (_grabbed) {
 286       ktree.ungrabDefaults(this);
 287       _grabbed = false;
 288     } else {
 289       ktree.grabDefaults(this);
 290       _grabbed = true;
 291     }
 292     return;
 293   }
 294
 295   default:
 296     break;
 297   }
 298
 299   // these actions require an active window
 300   if (_active != _clients.end()) {
 301     XWindow *window = *_active;
 302
 303     switch (it->type()) {
 304     case Action::iconify:
 305       window->iconify();
 306       return;
 307
 308     case Action::close:
 309       window->close();
 310       return;
 311
 312     case Action::raise:
 313       window->raise();
 314       return;
 315
 316     case Action::lower:
 317       window->lower();
 318       return;
 319
 320     case Action::sendToWorkspace:
 321       window->sendTo(it->number());
 322       return;
 323
 324     case Action::toggleOmnipresent:
 325       if (window->desktop() == 0xffffffff)
 326         window->sendTo(_active_desktop);
 327       else
 328         window->sendTo(0xffffffff);
 329       return;
 330
 331     case Action::moveWindowUp:
 332       window->move(window->x(), window->y() -
 333                    (it->number() != 0 ? it->number(): 1));
 334       return;
 335
 336     case Action::moveWindowDown:
 337       window->move(window->x(), window->y() +
 338                    (it->number() != 0 ? it->number(): 1));
 339       return;
 340
 341     case Action::moveWindowLeft:
 342       window->move(window->x() - (it->number() != 0 ? it->number(): 1),
 343                    window->y());
 344       return;
 345
 346     case Action::moveWindowRight:
 347       window->move(window->x() + (it->number() != 0 ? it->number(): 1),
 348                    window->y());
 349       return;
 350
 351     case Action::resizeWindowWidth:
 352       window->resizeRel(it->number(), 0);
 353       return;
 354
 355     case Action::resizeWindowHeight:
 356       window->resizeRel(0, it->number());
 357       return;
 358
 359     case Action::toggleShade:
 360       window->shade(! window->shaded());
 361       return;
 362
 363     case Action::toggleMaximizeHorizontal:
 364       window->toggleMaximize(XWindow::Max_Horz);
 365       return;
 366
 367     case Action::toggleMaximizeVertical:
 368       window->toggleMaximize(XWindow::Max_Vert);
 369       return;
 370
 371     case Action::toggleMaximizeFull:
 372       window->toggleMaximize(XWindow::Max_Full);
 373       return;
 374
 375     case Action::toggleDecorations:
 376       window->decorate(! window->decorated());
 377       return;
 378
 379     default:
 380       assert(false);  // unhandled action type!
 381       break;
 382     }
 383   }
 384 }
 385
 386
 387 void screen::handleKeyrelease(const XEvent &) {
 388   // the only keyrelease event we care about (for now) is when we do stacked
 389   // cycling and the modifier is released
 390   if (_stacked_cycling && _cycling && nothingIsPressed()) {
 391     // all modifiers have been released. ungrab the keyboard, move the
 392     // focused window to the top of the Z-order and raise it
 393     ungrabModifiers();
 394
 395     if (_active != _clients.end()) {
 396       XWindow *w = *_active;
 397       bool e = _last_active == _active;
 398       _clients.remove(w);
 399       _clients.push_front(w);
 400       _active = _clients.begin();
 401       if (e) _last_active = _active;
 402       w->raise();
 403     }
 404
 405     _cycling = false;
 406   }
 407 }
 408
 409
 410 // do we want to add this window to our list?
 411 bool screen::doAddWindow(Window window) const {
 412   assert(_managed);
 413
 414   Atom type;
 415   if (! _xatom->getValue(window, XAtom::net_wm_window_type, XAtom::atom,
 416                          type))
 417     return True;
 418
 419   if (type == _xatom->getAtom(XAtom::net_wm_window_type_dock) ||
 420       type == _xatom->getAtom(XAtom::net_wm_window_type_menu))
 421     return False;
 422
 423   return True;
 424 }
 425
 426
 427 void screen::updateEverything() {
 428   updateNumDesktops();
 429   updateActiveDesktop();
 430   updateClientList();
 431   updateActiveWindow();
 432 }
 433
 434
 435 void screen::updateNumDesktops() {
 436   assert(_managed);
 437
 438   if (! _xatom->getValue(_root, XAtom::net_number_of_desktops, XAtom::cardinal,
 439                          (unsigned long)_num_desktops))
 440     _num_desktops = 1;  // assume that there is at least 1 desktop!
 441 }
 442
 443
 444 void screen::updateActiveDesktop() {
 445   assert(_managed);
 446
 447   if (! _xatom->getValue(_root, XAtom::net_current_desktop, XAtom::cardinal,
 448                          (unsigned long)_active_desktop))
 449     _active_desktop = 0;  // there must be at least one desktop, and it must
 450                           // be the current one
 451 }
 452
 453
 454 void screen::updateClientList() {
 455   assert(_managed);
 456
 457   WindowList::iterator insert_point = _active;
 458   if (insert_point != _clients.end())
 459     ++insert_point; // get to the item client the focused client
 460
 461   // get the client list from the root window
 462   Window *rootclients = 0;
 463   unsigned long num = (unsigned) -1;
 464   if (! _xatom->getValue(_root, XAtom::net_client_list, XAtom::window, num,
 465                          &rootclients))
 466     num = 0;
 467
 468   WindowList::iterator it;
 469   const WindowList::iterator end = _clients.end();
 470   unsigned long i;
 471
 472   for (i = 0; i < num; ++i) {
 473     for (it = _clients.begin(); it != end; ++it)
 474       if (**it == rootclients[i])
 475         break;
 476     if (it == end) {  // didn't already exist
 477       if (doAddWindow(rootclients[i])) {
 478 //        cout << "Added window: 0x" << hex << rootclients[i] << dec << endl;
 479         // insert new clients after the active window
 480         _clients.insert(insert_point, new XWindow(_epist, this,
 481                                                   rootclients[i]));
 482       }
 483     }
 484   }
 485
 486   // remove clients that no longer exist (that belong to this screen)
 487   for (it = _clients.begin(); it != end;) {
 488     WindowList::iterator it2 = it;
 489     ++it;
 490
 491     // is on another screen?
 492     if ((*it2)->getScreen() != this)
 493       continue;
 494
 495     for (i = 0; i < num; ++i)
 496       if (**it2 == rootclients[i])
 497         break;
 498     if (i == num)  { // no longer exists
 499       //      cout << "Removed window: 0x" << hex << (*it2)->window() << dec << endl;
 500       // watch for the active and last-active window
 501       if (it2 == _active)
 502         _active = _clients.end();
 503       if (it2 == _last_active)
 504         _last_active = _clients.end();
 505       delete *it2;
 506       _clients.erase(it2);
 507     }
 508   }
 509
 510   if (rootclients) delete [] rootclients;
 511 }
 512
 513
 514 const XWindow *screen::lastActiveWindow() const {
 515   if (_last_active != _clients.end())
 516     return *_last_active;
 517
 518   // find a window if one exists
 519   WindowList::const_iterator it, end = _clients.end();
 520   for (it = _clients.begin(); it != end; ++it)
 521     if ((*it)->getScreen() == this && ! (*it)->iconic() &&
 522         (*it)->canFocus() &&
 523         ((*it)->desktop() == 0xffffffff ||
 524          (*it)->desktop() == _active_desktop))
 525       return *it;
 526
 527   // no windows on this screen
 528   return 0;
 529 }
 530
 531
 532 void screen::updateActiveWindow() {
 533   assert(_managed);
 534
 535   Window a = None;
 536   _xatom->getValue(_root, XAtom::net_active_window, XAtom::window, a);
 537
 538   WindowList::iterator it, end = _clients.end();
 539   for (it = _clients.begin(); it != end; ++it) {
 540     if (**it == a) {
 541       if ((*it)->getScreen() != this)
 542         return;
 543       break;
 544     }
 545   }
 546
 547   _active = it;
 548
 549   if (_active != end) {
 550     /* if we're not cycling and a window gets focus, add it to the top of the
 551      * cycle stack.
 552      */
 553     if (_stacked_cycling && !_cycling) {
 554       XWindow *win = *_active;
 555       _clients.remove(win);
 556       _clients.push_front(win);
 557       _active = _clients.begin();
 558
 559       _last_active = _active;
 560     }
 561   }
 562
 563   /*  cout << "Active window is now: ";
 564       if (_active == _clients.end()) cout << "None\n";
 565       else cout << "0x" << hex << (*_active)->window() << dec << endl;
 566   */
 567 }
 568
 569
 570 void screen::execCommand(const string &cmd) const {
 571   pid_t pid;
 572   if ((pid = fork()) == 0) {
 573     // disconnect the child from epist's session and the tty
 574     if (setsid() == -1) {
 575       cout << "warning: could not start a new process group\n";
 576       perror("setsid");
 577     }
 578
 579     // make the command run on the correct screen
 580     if (putenv(const_cast<char*>(_info->displayString().c_str()))) {
 581       cout << "warning: couldn't set environment variable 'DISPLAY'\n";
 582       perror("putenv()");
 583     }
 584     execl("/bin/sh", "sh", "-c", cmd.c_str(), NULL);
 585     exit(-1);
 586   } else if (pid == -1) {
 587     cout << _epist->getApplicationName() <<
 588       ": Could not fork a process for executing a command\n";
 589   }
 590 }
 591
 592
 593 void screen::cycleWindow(unsigned int state, const bool forward,
 594                          const int increment, const bool allscreens,
 595                          const bool alldesktops, const bool sameclass,
 596                          const string &cn)
 597 {
 598   assert(_managed);
 599   assert(increment > 0);
 600
 601   if (_clients.empty()) return;
 602
 603   string classname(cn);
 604   if (sameclass && classname.empty() && _active != _clients.end())
 605     classname = (*_active)->appClass();
 606
 607   WindowList::const_iterator target = _active,
 608     begin = _clients.begin(),
 609     end = _clients.end();
 610
 611   XWindow *t = 0;
 612
 613   for (int x = 0; x < increment; ++x) {
 614     while (1) {
 615       if (forward) {
 616         if (target == end) {
 617           target = begin;
 618         } else {
 619           ++target;
 620         }
 621       } else {
 622         if (target == begin)
 623           target = end;
 624         --target;
 625       }
 626
 627       // must be no window to focus
 628       if (target == _active)
 629         return;
 630
 631       // start back at the beginning of the loop
 632       if (target == end)
 633         continue;
 634
 635       // determine if this window is invalid for cycling to
 636       t = *target;
 637       if (t->iconic()) continue;
 638       if (! allscreens && t->getScreen() != this) continue;
 639       if (! alldesktops && ! (t->desktop() == _active_desktop ||
 640                               t->desktop() == 0xffffffff)) continue;
 641       if (sameclass && ! classname.empty() &&
 642           t->appClass() != classname) continue;
 643       if (! t->canFocus()) continue;
 644
 645       // found a good window so break out of the while, and perhaps continue
 646       // with the for loop
 647       break;
 648     }
 649   }
 650
 651   // phew. we found the window, so focus it.
 652   if (_stacked_cycling && state) {
 653     if (!_cycling) {
 654       // grab modifiers so we can intercept KeyReleases from them
 655       grabModifiers();
 656       _cycling = true;
 657     }
 658
 659     // if the window is on another desktop, we can't use XSetInputFocus, since
 660     // it doesn't imply a workspace change.
 661     if (_stacked_raise || (t->desktop() != _active_desktop &&
 662                            t->desktop() != 0xffffffff))
 663       t->focus(); // raise
 664     else
 665       t->focus(false); // don't raise
 666   }
 667   else {
 668     t->focus();
 669   }
 670 }
 671
 672
 673 void screen::cycleWorkspace(const bool forward, const int increment,
 674                             const bool loop) const {
 675   assert(_managed);
 676   assert(increment > 0);
 677
 678   unsigned int destination = _active_desktop;
 679
 680   for (int x = 0; x < increment; ++x) {
 681     if (forward) {
 682       if (destination < _num_desktops - 1)
 683         ++destination;
 684       else if (loop)
 685         destination = 0;
 686     } else {
 687       if (destination > 0)
 688         --destination;
 689       else if (loop)
 690         destination = _num_desktops - 1;
 691     }
 692   }
 693
 694   if (destination != _active_desktop)
 695     changeWorkspace(destination);
 696 }
 697
 698
 699 void screen::changeWorkspace(const int num) const {
 700   assert(_managed);
 701
 702   _xatom->sendClientMessage(_root, XAtom::net_current_desktop, _root, num);
 703 }
 704
 705 void screen::changeWorkspaceVert(const int num) const {
 706   assert(_managed);
 707   int width = 0;
 708   int num_desktops = (signed)_num_desktops;
 709   int active_desktop = (signed)_active_desktop;
 710   int wnum = 0;
 711
 712   _config->getValue(Config::workspaceColumns, width);
 713
 714   if (width > num_desktops || width <= 0)
 715     return;
 716
 717   // a cookie to the person that makes this pretty
 718   if (num < 0) {
 719     wnum = active_desktop - width;
 720     if (wnum < 0) {
 721       wnum = num_desktops/width * width + active_desktop;
 722       if (wnum >= num_desktops)
 723         wnum = num_desktops - 1;
 724     }
 725   }
 726   else {
 727     wnum = active_desktop + width;
 728     if (wnum >= num_desktops) {
 729       wnum = (active_desktop + width) % num_desktops - 1;
 730       if (wnum < 0)
 731         wnum = 0;
 732     }
 733   }
 734   changeWorkspace(wnum);
 735 }
 736
 737 void screen::changeWorkspaceHorz(const int num) const {
 738   assert(_managed);
 739   int width = 0;
 740   int num_desktops = (signed)_num_desktops;
 741   int active_desktop = (signed)_active_desktop;
 742   int wnum = 0;
 743
 744   _config->getValue(Config::workspaceColumns, width);
 745
 746   if (width > num_desktops || width <= 0)
 747     return;
 748
 749   if (num < 0) {
 750     if (active_desktop % width != 0)
 751       changeWorkspace(active_desktop - 1);
 752     else {
 753       wnum = active_desktop + width - 1;
 754       if (wnum >= num_desktops)
 755         wnum = num_desktops - 1;
 756     }
 757   }
 758   else {
 759     if (active_desktop % width != width - 1) {
 760       wnum = active_desktop + 1;
 761       if (wnum >= num_desktops)
 762         wnum = num_desktops / width * width;
 763     }
 764     else
 765       wnum = active_desktop - width + 1;
 766   }
 767   changeWorkspace(wnum);
 768 }
 769
 770 void screen::grabKey(const KeyCode keyCode, const int modifierMask) const {
 771
 772   Display *display = _epist->getXDisplay();
 773   int numlockMask, scrolllockMask;
 774
 775   _epist->getLockModifiers(numlockMask, scrolllockMask);
 776
 777   XGrabKey(display, keyCode, modifierMask,
 778            _root, True, GrabModeAsync, GrabModeAsync);
 779   XGrabKey(display, keyCode,
 780            modifierMask|LockMask,
 781            _root, True, GrabModeAsync, GrabModeAsync);
 782   XGrabKey(display, keyCode,
 783            modifierMask|scrolllockMask,
 784            _root, True, GrabModeAsync, GrabModeAsync);
 785   XGrabKey(display, keyCode,
 786            modifierMask|numlockMask,
 787            _root, True, GrabModeAsync, GrabModeAsync);
 788
 789   XGrabKey(display, keyCode,
 790            modifierMask|LockMask|scrolllockMask,
 791            _root, True, GrabModeAsync, GrabModeAsync);
 792   XGrabKey(display, keyCode,
 793            modifierMask|scrolllockMask|numlockMask,
 794            _root, True, GrabModeAsync, GrabModeAsync);
 795   XGrabKey(display, keyCode,
 796            modifierMask|numlockMask|LockMask,
 797            _root, True, GrabModeAsync, GrabModeAsync);
 798
 799   XGrabKey(display, keyCode,
 800            modifierMask|numlockMask|LockMask|scrolllockMask,
 801            _root, True, GrabModeAsync, GrabModeAsync);
 802 }
 803
 804 void screen::ungrabKey(const KeyCode keyCode, const int modifierMask) const {
 805
 806   Display *display = _epist->getXDisplay();
 807   int numlockMask, scrolllockMask;
 808
 809   _epist->getLockModifiers(numlockMask, scrolllockMask);
 810
 811   XUngrabKey(display, keyCode, modifierMask, _root);
 812   XUngrabKey(display, keyCode, modifierMask|LockMask, _root);
 813   XUngrabKey(display, keyCode, modifierMask|scrolllockMask, _root);
 814   XUngrabKey(display, keyCode, modifierMask|numlockMask, _root);
 815   XUngrabKey(display, keyCode, modifierMask|LockMask|scrolllockMask, _root);
 816   XUngrabKey(display, keyCode, modifierMask|scrolllockMask|numlockMask, _root);
 817   XUngrabKey(display, keyCode, modifierMask|numlockMask|LockMask, _root);
 818   XUngrabKey(display, keyCode, modifierMask|numlockMask|LockMask|
 819              scrolllockMask, _root);
 820 }
 821
 822
 823 void screen::grabModifiers() const {
 824   Display *display = _epist->getXDisplay();
 825
 826   XGrabKeyboard(display, rootWindow(), True, GrabModeAsync,
 827                 GrabModeAsync, CurrentTime);
 828 }
 829
 830
 831 void screen::ungrabModifiers() const {
 832   Display *display = _epist->getXDisplay();
 833
 834   XUngrabKeyboard(display, CurrentTime);
 835 }
 836
 837
 838 bool screen::nothingIsPressed(void) const
 839 {
 840   char keys[32];
 841   XQueryKeymap(_epist->getXDisplay(), keys);
 842
 843   for (int i = 0; i < 32; ++i) {
 844     if (keys[i] != 0)
 845       return false;
 846   }
 847
 848   return true;
 849 }