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_UNISTD_H
  29 #  include <sys/types.h>
  30 #  include <unistd.h>
  31 #endif // HAVE_UNISTD_H
  32 }
  33
  34 #include <iostream>
  35 #include <string>
  36
  37 using std::cout;
  38 using std::endl;
  39 using std::hex;
  40 using std::dec;
  41 using std::string;
  42
  43 #include "../../src/BaseDisplay.hh"
  44 #include "../../src/XAtom.hh"
  45 #include "screen.hh"
  46 #include "epist.hh"
  47
  48
  49 screen::screen(epist *epist, int number) {
  50   _epist = epist;
  51   _xatom = _epist->xatom();
  52   _number = number;
  53   _active = _clients.end();
  54   _info = _epist->getScreenInfo(_number);
  55   _root = _info->getRootWindow();
  56
  57   // find a window manager supporting NETWM, waiting for it to load if we must
  58   int count = 20;  // try for 20 seconds
  59   _managed = false;
  60   while (! (_epist->doShutdown() || _managed || count <= 0)) {
  61     if (! (_managed = findSupportingWM()))
  62       usleep(1000);
  63     --count;
  64   }
  65   if (_managed)
  66     cout << "Found compatible window manager '" << _wm_name << "' for screen "
  67       << _number << ".\n";
  68   else {
  69     cout << "Unable to find a compatible window manager for screen " <<
  70       _number << ".\n";
  71     return;
  72   }
  73
  74   XSelectInput(_epist->getXDisplay(), _root, PropertyChangeMask);
  75
  76   updateNumDesktops();
  77   updateActiveDesktop();
  78   updateClientList();
  79   updateActiveWindow();
  80 }
  81
  82
  83 screen::~screen() {
  84   if (_managed)
  85     XSelectInput(_epist->getXDisplay(), _root, None);
  86 }
  87
  88
  89 bool screen::findSupportingWM() {
  90   Window support_win;
  91   if (! _xatom->getValue(_root, XAtom::net_supporting_wm_check, XAtom::window,
  92                          support_win) || support_win == None)
  93     return false;
  94
  95   string title;
  96   _xatom->getValue(support_win, XAtom::net_wm_name, XAtom::utf8, title);
  97   _wm_name = title;
  98   return true;
  99 }
 100
 101
 102 XWindow *screen::findWindow(const XEvent &e) const {
 103   assert(_managed);
 104
 105   WindowList::const_iterator it, end = _clients.end();
 106   for (it = _clients.begin(); it != end; ++it)
 107     if (**it == e.xany.window)
 108       break;
 109   if(it == end)
 110     return 0;
 111   return *it;
 112 }
 113
 114
 115 void screen::processEvent(const XEvent &e) {
 116   assert(_managed);
 117   assert(e.xany.window == _root);
 118
 119   XWindow *window = 0;
 120   if (e.xany.window != _root) {
 121     window = findWindow(e);  // find the window
 122     assert(window); // we caught an event for a window we don't know about!?
 123   }
 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     if (e.xproperty.atom == _xatom->getAtom(XAtom::net_current_desktop))
 131       updateActiveDesktop();
 132     if (e.xproperty.atom == _xatom->getAtom(XAtom::net_active_window))
 133       updateActiveWindow();
 134     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 }
 152
 153 void screen::handleKeypress(const XEvent &e) {
 154   ActionList::const_iterator it = _epist->actions().begin();
 155   ActionList::const_iterator end = _epist->actions().end();
 156   for (; it != end; ++it) {
 157     if (e.xkey.keycode == it->keycode() &&
 158         e.xkey.state == it->modifierMask()) {
 159       switch (it->type()) {
 160       case Action::nextWorkspace:
 161         cycleWorkspace(true);
 162         return;
 163
 164       case Action::prevWorkspace:
 165         cycleWorkspace(false);
 166         return;
 167
 168       case Action::nextWindow:
 169         cycleWindow(true);
 170         return;
 171
 172       case Action::prevWindow:
 173         cycleWindow(false);
 174         return;
 175
 176       case Action::nextWindowOnAllWorkspaces:
 177         cycleWindow(true, true);
 178         return;
 179
 180       case Action::prevWindowOnAllWorkspaces:
 181         cycleWindow(false, true);
 182         return;
 183
 184       case Action::nextWindowOfClass:
 185         cycleWindow(true, false, true);
 186         return;
 187
 188       case Action::prevWindowOfClass:
 189         cycleWindow(false, false, true);
 190         return;
 191
 192       case Action::nextWindowOfClassOnAllWorkspaces:
 193         cycleWindow(true, true, true);
 194         return;
 195
 196       case Action::prevWindowOfClassOnAllWorkspaces:
 197         cycleWindow(false, true, true);
 198         return;
 199
 200       case Action::changeWorkspace:
 201         changeWorkspace(it->number());
 202         return;
 203
 204       case Action::execute:
 205         execCommand(it->string());
 206         return;
 207       }
 208
 209       // these actions require an active window
 210       if (_active != _clients.end()) {
 211         XWindow *window = *_active;
 212
 213         switch (it->type()) {
 214         case Action::iconify:
 215           window->iconify();
 216           return;
 217
 218         case Action::close:
 219           window->close();
 220           return;
 221
 222         case Action::raise:
 223           window->raise();
 224           return;
 225
 226         case Action::lower:
 227           window->lower();
 228           return;
 229
 230         case Action::sendToWorkspace:
 231           window->sendTo(it->number());
 232           return;
 233
 234         case Action::toggleomnipresent:
 235           if (window->desktop() == 0xffffffff)
 236             window->sendTo(_active_desktop);
 237           else
 238             window->sendTo(0xffffffff);
 239           return;
 240
 241         case Action::toggleshade:
 242           window->shade(! window->shaded());
 243           return;
 244         }
 245       }
 246     }
 247   }
 248 }
 249
 250 // do we want to add this window to our list?
 251 bool screen::doAddWindow(Window window) const {
 252   assert(_managed);
 253
 254   Atom type;
 255   if (! _xatom->getValue(window, XAtom::net_wm_window_type, XAtom::atom,
 256                          type))
 257     return True;
 258
 259   if (type == _xatom->getAtom(XAtom::net_wm_window_type_dock) ||
 260       type == _xatom->getAtom(XAtom::net_wm_window_type_menu))
 261     return False;
 262
 263   return True;
 264 }
 265
 266
 267 void screen::updateNumDesktops() {
 268   assert(_managed);
 269
 270   if (! _xatom->getValue(_root, XAtom::net_number_of_desktops, XAtom::cardinal,
 271                          (unsigned long)_num_desktops))
 272     _num_desktops = 1;  // assume that there is at least 1 desktop!
 273 }
 274
 275
 276 void screen::updateActiveDesktop() {
 277   assert(_managed);
 278
 279   if (! _xatom->getValue(_root, XAtom::net_current_desktop, XAtom::cardinal,
 280                          (unsigned long)_active_desktop))
 281     _active_desktop = 0;  // there must be at least one desktop, and it must
 282                           // be the current one
 283 }
 284
 285
 286 void screen::updateClientList() {
 287   assert(_managed);
 288
 289   WindowList::iterator insert_point = _active;
 290   if (insert_point != _clients.end())
 291     ++insert_point; // get to the item client the focused client
 292
 293   // get the client list from the root window
 294   Window *rootclients = 0;
 295   unsigned long num = (unsigned) -1;
 296   if (! _xatom->getValue(_root, XAtom::net_client_list, XAtom::window, num,
 297                          &rootclients)) {
 298     while (! _clients.empty()) {
 299       delete _clients.front();
 300       _clients.erase(_clients.begin());
 301     }
 302     if (rootclients) delete [] rootclients;
 303     return;
 304   }
 305
 306   WindowList::iterator it, end = _clients.end();
 307   unsigned long i;
 308
 309   // insert new clients after the active window
 310   for (i = 0; i < num; ++i) {
 311     for (it = _clients.begin(); it != end; ++it)
 312       if (**it == rootclients[i])
 313         break;
 314     if (it == end) {  // didn't already exist
 315       if (doAddWindow(rootclients[i])) {
 316         cout << "Added window: 0x" << hex << rootclients[i] << dec << endl;
 317         _clients.insert(insert_point, new XWindow(_epist, this,
 318                                                   rootclients[i]));
 319       }
 320     }
 321   }
 322
 323   // remove clients that no longer exist
 324   for (it = _clients.begin(); it != end;) {
 325     WindowList::iterator it2 = it++;
 326     for (i = 0; i < num; ++i)
 327       if (**it2 == rootclients[i])
 328         break;
 329     if (i == num)  { // no longer exists
 330       cout << "Removed window: 0x" << hex << (*it2)->window() << dec << endl;
 331       delete *it2;
 332       _clients.erase(it2);
 333     }
 334   }
 335
 336   if (rootclients) delete [] rootclients;
 337 }
 338
 339
 340 void screen::updateActiveWindow() {
 341   assert(_managed);
 342
 343   Window a = None;
 344   _xatom->getValue(_root, XAtom::net_active_window, XAtom::window, a);
 345
 346   WindowList::iterator it, end = _clients.end();
 347   for (it = _clients.begin(); it != end; ++it) {
 348     if (**it == a)
 349       break;
 350   }
 351   _active = it;
 352
 353   cout << "Active window is now: ";
 354   if (_active == _clients.end()) cout << "None\n";
 355   else cout << "0x" << hex << (*_active)->window() << dec << endl;
 356 }
 357
 358
 359 void screen::execCommand(const std::string &cmd) const {
 360   pid_t pid;
 361   if ((pid = fork()) == 0) {
 362     extern char **environ;
 363
 364     char *const argv[] = {
 365       "sh",
 366       "-c",
 367       const_cast<char *>(cmd.c_str()),
 368       0
 369     };
 370     // make the command run on the correct screen
 371     if (putenv(const_cast<char*>(_info->displayString().c_str()))) {
 372       cout << "warning: couldn't set environment variable 'DISPLAY'\n";
 373       perror("putenv()");
 374     }
 375     execve("/bin/sh", argv, environ);
 376     exit(127);
 377   } else if (pid == -1) {
 378     cout << _epist->getApplicationName() <<
 379       ": Could not fork a process for executing a command\n";
 380   }
 381 }
 382
 383
 384 void screen::cycleWindow(const bool forward, const bool alldesktops,
 385                          const bool sameclass) const {
 386   assert(_managed);
 387
 388   if (_clients.empty()) return;
 389
 390   WindowList::const_iterator target = _active;
 391
 392   if (target == _clients.end())
 393     target = _clients.begin();
 394
 395   do {
 396     if (forward) {
 397       ++target;
 398       if (target == _clients.end())
 399         target = _clients.begin();
 400     } else {
 401       if (target == _clients.begin())
 402         target = _clients.end();
 403       --target;
 404     }
 405   } while (target == _clients.end() ||
 406            (*target)->iconic() ||
 407            (! alldesktops && (*target)->desktop() != _active_desktop) ||
 408            (sameclass && _active != _clients.end() &&
 409             (*target)->appClass() != (*_active)->appClass()));
 410
 411   if (target != _clients.end())
 412     (*target)->focus();
 413 }
 414
 415
 416 void screen::cycleWorkspace(const bool forward, const bool loop) const {
 417   assert(_managed);
 418
 419   unsigned int destination = _active_desktop;
 420
 421   if (forward) {
 422     if (destination < _num_desktops - 1)
 423       ++destination;
 424     else if (loop)
 425       destination = 0;
 426   } else {
 427     if (destination > 0)
 428       --destination;
 429     else if (loop)
 430       destination = _num_desktops - 1;
 431   }
 432
 433   if (destination != _active_desktop)
 434     changeWorkspace(destination);
 435 }
 436
 437
 438 void screen::changeWorkspace(const int num) const {
 439   assert(_managed);
 440
 441   _xatom->sendClientMessage(_root, XAtom::net_current_desktop, _root, num);
 442 }