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