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