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

   1 // -*- mode: C++; indent-tabs-mode: nil; -*-
   2 // screen.cc for Epistophy - 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
  38 #include <iostream>
  39 #include <string>
  40
  41 using std::cout;
  42 using std::endl;
  43 using std::hex;
  44 using std::dec;
  45 using std::string;
  46
  47 #include "../../src/BaseDisplay.hh"
  48 #include "../../src/XAtom.hh"
  49 #include "screen.hh"
  50 #include "epist.hh"
  51
  52
  53 screen::screen(epist *epist, int number) {
  54   _epist = epist;
  55   _xatom = _epist->xatom();
  56   _number = number;
  57   _active = _clients.end();
  58   _info = _epist->getScreenInfo(_number);
  59   _root = _info->getRootWindow();
  60
  61   // find a window manager supporting NETWM, waiting for it to load if we must
  62   int count = 20;  // try for 20 seconds
  63   _managed = false;
  64   while (! (_epist->doShutdown() || _managed || count <= 0)) {
  65     if (! (_managed = findSupportingWM()))
  66       usleep(1000);
  67     --count;
  68   }
  69   if (_managed)
  70     cout << "Found compatible window manager '" << _wm_name << "' for screen "
  71       << _number << ".\n";
  72   else {
  73     cout << "Unable to find a compatible window manager for screen " <<
  74       _number << ".\n";
  75     return;
  76   }
  77
  78   XSelectInput(_epist->getXDisplay(), _root, PropertyChangeMask);
  79
  80   updateNumDesktops();
  81   updateActiveDesktop();
  82   updateClientList();
  83   updateActiveWindow();
  84 }
  85
  86
  87 screen::~screen() {
  88   if (_managed)
  89     XSelectInput(_epist->getXDisplay(), _root, None);
  90 }
  91
  92
  93 bool screen::findSupportingWM() {
  94   Window support_win;
  95   if (! _xatom->getValue(_root, XAtom::net_supporting_wm_check, XAtom::window,
  96                          support_win) || support_win == None)
  97     return false;
  98
  99   string title;
 100   _xatom->getValue(support_win, XAtom::net_wm_name, XAtom::utf8, title);
 101   _wm_name = title;
 102   return true;
 103 }
 104
 105
 106 XWindow *screen::findWindow(const XEvent &e) const {
 107   assert(_managed);
 108
 109   WindowList::const_iterator it, end = _clients.end();
 110   for (it = _clients.begin(); it != end; ++it)
 111     if (**it == e.xany.window)
 112       break;
 113   if(it == end)
 114     return 0;
 115   return *it;
 116 }
 117
 118
 119 void screen::processEvent(const XEvent &e) {
 120   assert(_managed);
 121   assert(e.xany.window == _root);
 122
 123   XWindow *window = 0;
 124   if (e.xany.window != _root) {
 125     window = findWindow(e);  // find the window
 126     assert(window); // we caught an event for a window we don't know about!?
 127   }
 128
 129   switch (e.type) {
 130   case PropertyNotify:
 131     // root window
 132     if (e.xproperty.atom == _xatom->getAtom(XAtom::net_number_of_desktops))
 133       updateNumDesktops();
 134     if (e.xproperty.atom == _xatom->getAtom(XAtom::net_current_desktop))
 135       updateActiveDesktop();
 136     if (e.xproperty.atom == _xatom->getAtom(XAtom::net_active_window))
 137       updateActiveWindow();
 138     if (e.xproperty.atom == _xatom->getAtom(XAtom::net_client_list)) {
 139       // catch any window unmaps first
 140       XEvent ev;
 141       if (XCheckTypedWindowEvent(_epist->getXDisplay(), e.xany.window,
 142                                  DestroyNotify, &ev) ||
 143           XCheckTypedWindowEvent(_epist->getXDisplay(), e.xany.window,
 144                                  UnmapNotify, &ev)) {
 145         processEvent(ev);
 146       }
 147
 148       updateClientList();
 149     }
 150     break;
 151   case KeyPress:
 152     handleKeypress(e);
 153     break;
 154   }
 155 }
 156
 157 void screen::handleKeypress(const XEvent &e) {
 158   ActionList::const_iterator it = _epist->actions().begin();
 159   ActionList::const_iterator end = _epist->actions().end();
 160   for (; it != end; ++it) {
 161     if (e.xkey.keycode == it->keycode() &&
 162         e.xkey.state == it->modifierMask()) {
 163       switch (it->type()) {
 164       case Action::nextWorkspace:
 165         cycleWorkspace(true);
 166         return;
 167
 168       case Action::prevWorkspace:
 169         cycleWorkspace(false);
 170         return;
 171
 172       case Action::nextWindow:
 173         cycleWindow(true);
 174         return;
 175
 176       case Action::prevWindow:
 177         cycleWindow(false);
 178         return;
 179
 180       case Action::nextWindowOnAllWorkspaces:
 181         cycleWindow(true, true);
 182         return;
 183
 184       case Action::prevWindowOnAllWorkspaces:
 185         cycleWindow(false, true);
 186         return;
 187
 188       case Action::nextWindowOfClass:
 189         cycleWindow(true, false, true, it->string());
 190         return;
 191
 192       case Action::prevWindowOfClass:
 193         cycleWindow(false, false, true, it->string());
 194         return;
 195
 196       case Action::nextWindowOfClassOnAllWorkspaces:
 197         cycleWindow(true, true, true, it->string());
 198         return;
 199
 200       case Action::prevWindowOfClassOnAllWorkspaces:
 201         cycleWindow(false, true, true, it->string());
 202         return;
 203
 204       case Action::changeWorkspace:
 205         changeWorkspace(it->number());
 206         return;
 207
 208       case Action::execute:
 209         execCommand(it->string());
 210         return;
 211
 212       default:
 213         break;
 214       }
 215
 216       // these actions require an active window
 217       if (_active != _clients.end()) {
 218         XWindow *window = *_active;
 219
 220         switch (it->type()) {
 221         case Action::iconify:
 222           window->iconify();
 223           return;
 224
 225         case Action::close:
 226           window->close();
 227           return;
 228
 229         case Action::raise:
 230           window->raise();
 231           return;
 232
 233         case Action::lower:
 234           window->lower();
 235           return;
 236
 237         case Action::sendToWorkspace:
 238           window->sendTo(it->number());
 239           return;
 240
 241         case Action::toggleomnipresent:
 242           if (window->desktop() == 0xffffffff)
 243             window->sendTo(_active_desktop);
 244           else
 245             window->sendTo(0xffffffff);
 246           return;
 247
 248         case Action::moveWindowUp:
 249           window->move(window->x(), window->y() - it->number());
 250           return;
 251
 252         case Action::moveWindowDown:
 253           window->move(window->x(), window->y() + it->number());
 254           return;
 255
 256         case Action::moveWindowLeft:
 257           window->move(window->x() - it->number(), window->y());
 258           return;
 259
 260         case Action::moveWindowRight:
 261           window->move(window->x() + it->number(), window->y());
 262           return;
 263
 264         case Action::resizeWindowWidth:
 265           window->resize(window->width() + it->number(), window->height());
 266           return;
 267
 268         case Action::resizeWindowHeight:
 269           window->resize(window->width(), window->height() + it->number());
 270           return;
 271
 272         case Action::toggleshade:
 273           window->shade(! window->shaded());
 274           return;
 275
 276         case Action::toggleMaximizeHorizontal:
 277           window->toggleMaximize(XWindow::Max_Horz);
 278           return;
 279
 280         case Action::toggleMaximizeVertical:
 281           window->toggleMaximize(XWindow::Max_Vert);
 282           return;
 283
 284         case Action::toggleMaximizeFull:
 285           window->toggleMaximize(XWindow::Max_Full);
 286           return;
 287
 288         default:
 289           assert(false);  // unhandled action type!
 290           break;
 291         }
 292       }
 293     }
 294   }
 295 }
 296
 297 // do we want to add this window to our list?
 298 bool screen::doAddWindow(Window window) const {
 299   assert(_managed);
 300
 301   Atom type;
 302   if (! _xatom->getValue(window, XAtom::net_wm_window_type, XAtom::atom,
 303                          type))
 304     return True;
 305
 306   if (type == _xatom->getAtom(XAtom::net_wm_window_type_dock) ||
 307       type == _xatom->getAtom(XAtom::net_wm_window_type_menu))
 308     return False;
 309
 310   return True;
 311 }
 312
 313
 314 void screen::updateNumDesktops() {
 315   assert(_managed);
 316
 317   if (! _xatom->getValue(_root, XAtom::net_number_of_desktops, XAtom::cardinal,
 318                          (unsigned long)_num_desktops))
 319     _num_desktops = 1;  // assume that there is at least 1 desktop!
 320 }
 321
 322
 323 void screen::updateActiveDesktop() {
 324   assert(_managed);
 325
 326   if (! _xatom->getValue(_root, XAtom::net_current_desktop, XAtom::cardinal,
 327                          (unsigned long)_active_desktop))
 328     _active_desktop = 0;  // there must be at least one desktop, and it must
 329                           // be the current one
 330 }
 331
 332
 333 void screen::updateClientList() {
 334   assert(_managed);
 335
 336   WindowList::iterator insert_point = _active;
 337   if (insert_point != _clients.end())
 338     ++insert_point; // get to the item client the focused client
 339
 340   // get the client list from the root window
 341   Window *rootclients = 0;
 342   unsigned long num = (unsigned) -1;
 343   if (! _xatom->getValue(_root, XAtom::net_client_list, XAtom::window, num,
 344                          &rootclients)) {
 345     while (! _clients.empty()) {
 346       delete _clients.front();
 347       _clients.erase(_clients.begin());
 348     }
 349     if (rootclients) delete [] rootclients;
 350     return;
 351   }
 352
 353   WindowList::iterator it, end = _clients.end();
 354   unsigned long i;
 355
 356   // insert new clients after the active window
 357   for (i = 0; i < num; ++i) {
 358     for (it = _clients.begin(); it != end; ++it)
 359       if (**it == rootclients[i])
 360         break;
 361     if (it == end) {  // didn't already exist
 362       if (doAddWindow(rootclients[i])) {
 363         cout << "Added window: 0x" << hex << rootclients[i] << dec << endl;
 364         _clients.insert(insert_point, new XWindow(_epist, this,
 365                                                   rootclients[i]));
 366       }
 367     }
 368   }
 369
 370   // remove clients that no longer exist
 371   for (it = _clients.begin(); it != end;) {
 372     WindowList::iterator it2 = it++;
 373     for (i = 0; i < num; ++i)
 374       if (**it2 == rootclients[i])
 375         break;
 376     if (i == num)  { // no longer exists
 377       cout << "Removed window: 0x" << hex << (*it2)->window() << dec << endl;
 378       delete *it2;
 379       _clients.erase(it2);
 380     }
 381   }
 382
 383   if (rootclients) delete [] rootclients;
 384 }
 385
 386
 387 void screen::updateActiveWindow() {
 388   assert(_managed);
 389
 390   Window a = None;
 391   _xatom->getValue(_root, XAtom::net_active_window, XAtom::window, a);
 392
 393   WindowList::iterator it, end = _clients.end();
 394   for (it = _clients.begin(); it != end; ++it) {
 395     if (**it == a)
 396       break;
 397   }
 398   _active = it;
 399
 400   cout << "Active window is now: ";
 401   if (_active == _clients.end()) cout << "None\n";
 402   else cout << "0x" << hex << (*_active)->window() << dec << endl;
 403 }
 404
 405
 406 void screen::execCommand(const std::string &cmd) const {
 407   pid_t pid;
 408   if ((pid = fork()) == 0) {
 409     extern char **environ;
 410
 411     char *const argv[] = {
 412       "sh",
 413       "-c",
 414       const_cast<char *>(cmd.c_str()),
 415       0
 416     };
 417     // make the command run on the correct screen
 418     if (putenv(const_cast<char*>(_info->displayString().c_str()))) {
 419       cout << "warning: couldn't set environment variable 'DISPLAY'\n";
 420       perror("putenv()");
 421     }
 422     execve("/bin/sh", argv, environ);
 423     exit(127);
 424   } else if (pid == -1) {
 425     cout << _epist->getApplicationName() <<
 426       ": Could not fork a process for executing a command\n";
 427   }
 428 }
 429
 430
 431 void screen::cycleWindow(const bool forward, const bool alldesktops,
 432                          const bool sameclass, const string &cn) const {
 433   assert(_managed);
 434
 435   if (_clients.empty()) return;
 436
 437   WindowList::const_iterator target = _active;
 438
 439   string classname = cn;
 440   if (sameclass && classname.empty() && target != _clients.end())
 441     classname = (*target)->appClass();
 442
 443   if (target == _clients.end())
 444     target = _clients.begin();
 445
 446   do {
 447     if (forward) {
 448       ++target;
 449       if (target == _clients.end())
 450         target = _clients.begin();
 451     } else {
 452       if (target == _clients.begin())
 453         target = _clients.end();
 454       --target;
 455     }
 456   } while (target == _clients.end() ||
 457            (*target)->iconic() ||
 458            (! alldesktops && (*target)->desktop() != _active_desktop) ||
 459            (sameclass && ! classname.empty() &&
 460             (*target)->appClass() != classname));
 461
 462   if (target != _clients.end())
 463     (*target)->focus();
 464 }
 465
 466
 467 void screen::cycleWorkspace(const bool forward, const bool loop) const {
 468   assert(_managed);
 469
 470   unsigned int destination = _active_desktop;
 471
 472   if (forward) {
 473     if (destination < _num_desktops - 1)
 474       ++destination;
 475     else if (loop)
 476       destination = 0;
 477   } else {
 478     if (destination > 0)
 479       --destination;
 480     else if (loop)
 481       destination = _num_desktops - 1;
 482   }
 483
 484   if (destination != _active_desktop)
 485     changeWorkspace(destination);
 486 }
 487
 488
 489 void screen::changeWorkspace(const int num) const {
 490   assert(_managed);
 491
 492   _xatom->sendClientMessage(_root, XAtom::net_current_desktop, _root, num);
 493 }