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/XAtom.hh"
  44 #include "screen.hh"
  45 #include "epist.hh"
  46
  47
  48 screen::screen(epist *epist, int number) {
  49   _epist = epist;
  50   _xatom = _epist->xatom();
  51   _number = number;
  52   _active = _clients.end();
  53   _root = RootWindow(_epist->getXDisplay(), _number);
  54
  55   // find a window manager supporting NETWM, waiting for it to load if we must
  56   int count = 20;  // try for 20 seconds
  57   _managed = false;
  58   while (! (_epist->doShutdown() || _managed || count <= 0)) {
  59     if (! (_managed = findSupportingWM()))
  60       usleep(1000);
  61     --count;
  62   }
  63   if (_managed)
  64     cout << "Found compatible window manager '" << _wm_name << "' for screen "
  65       << _number << ".\n";
  66   else {
  67     cout << "Unable to find a compatible window manager for screen " <<
  68       _number << ".\n";
  69     return;
  70   }
  71
  72   XSelectInput(_epist->getXDisplay(), _root, PropertyChangeMask);
  73
  74   updateClientList();
  75   updateActiveWindow();
  76 }
  77
  78
  79 screen::~screen() {
  80   if (_managed)
  81     XSelectInput(_epist->getXDisplay(), _root, None);
  82 }
  83
  84
  85 bool screen::findSupportingWM() {
  86   Window support_win;
  87   if (! _xatom->getValue(_root, XAtom::net_supporting_wm_check, XAtom::window,
  88                          support_win) || support_win == None)
  89     return false;
  90
  91   string title;
  92   _xatom->getValue(support_win, XAtom::net_wm_name, XAtom::utf8, title);
  93   _wm_name = title;
  94   return true;
  95 }
  96
  97
  98 XWindow *screen::findWindow(const XEvent &e) const {
  99   assert(_managed);
 100
 101   WindowList::const_iterator it, end = _clients.end();
 102   for (it = _clients.begin(); it != end; ++it)
 103     if (**it == e.xany.window)
 104       break;
 105   if(it == end)
 106     return 0;
 107   return *it;
 108 }
 109
 110
 111 void screen::processEvent(const XEvent &e) {
 112   assert(_managed);
 113   assert(e.xany.window == _root);
 114
 115   XWindow *window = 0;
 116   if (e.xany.window != _root) {
 117     window = findWindow(e);  // find the window
 118     assert(window); // we caught an event for a window we don't know about!?
 119   }
 120
 121   switch (e.type) {
 122   case PropertyNotify:
 123     // root window
 124     if (e.xproperty.atom == _xatom->getAtom(XAtom::net_active_window))
 125       updateActiveWindow();
 126     if (e.xproperty.atom == _xatom->getAtom(XAtom::net_client_list)) {
 127       // catch any window unmaps first
 128       XEvent ev;
 129       if (XCheckTypedWindowEvent(_epist->getXDisplay(), e.xany.window,
 130                                  DestroyNotify, &ev) ||
 131           XCheckTypedWindowEvent(_epist->getXDisplay(), e.xany.window,
 132                                  UnmapNotify, &ev)) {
 133         processEvent(ev);
 134       }
 135
 136       updateClientList();
 137     }
 138     break;
 139   case KeyPress:
 140     handleKeypress(e);
 141     break;
 142   }
 143 }
 144
 145 void screen::handleKeypress(const XEvent &e) {
 146   list<Action>::const_iterator it = _epist->actions().begin();
 147   list<Action>::const_iterator end = _epist->actions().end();
 148   for (; it != end; ++it) {
 149     if (e.xkey.keycode == it->keycode() &&
 150         e.xkey.state == it->modifierMask() )
 151       {
 152         switch (it->type()) {
 153         case Action::nextWorkspace:
 154           cycleWorkspace(true);
 155           break;
 156         case Action::prevWorkspace:
 157           cycleWorkspace(false);
 158           break;
 159         case Action::changeWorkspace:
 160           changeWorkspace(it->number());
 161           break;
 162         case Action::shade:
 163           toggleShaded((*_active)->window());
 164           break;
 165         }
 166         break;
 167       }
 168   }
 169 }
 170
 171 // do we want to add this window to our list?
 172 bool screen::doAddWindow(Window window) const {
 173   assert(_managed);
 174
 175   Atom type;
 176   if (! _xatom->getValue(window, XAtom::net_wm_window_type, XAtom::atom,
 177                          type))
 178     return True;
 179
 180   if (type == _xatom->getAtom(XAtom::net_wm_window_type_dock) ||
 181       type == _xatom->getAtom(XAtom::net_wm_window_type_menu))
 182     return False;
 183
 184   return True;
 185 }
 186
 187
 188 void screen::updateClientList() {
 189   assert(_managed);
 190
 191   WindowList::iterator insert_point = _active;
 192   if (insert_point != _clients.end())
 193     ++insert_point; // get to the item client the focused client
 194
 195   // get the client list from the root window
 196   Window *rootclients = 0;
 197   unsigned long num = (unsigned) -1;
 198   if (! _xatom->getValue(_root, XAtom::net_client_list, XAtom::window, num,
 199                          &rootclients)) {
 200     while (! _clients.empty()) {
 201       delete _clients.front();
 202       _clients.erase(_clients.begin());
 203     }
 204     if (rootclients) delete [] rootclients;
 205     return;
 206   }
 207
 208   WindowList::iterator it, end = _clients.end();
 209   unsigned long i;
 210
 211   // insert new clients after the active window
 212   for (i = 0; i < num; ++i) {
 213     for (it = _clients.begin(); it != end; ++it)
 214       if (**it == rootclients[i])
 215         break;
 216     if (it == end) {  // didn't already exist
 217       if (doAddWindow(rootclients[i])) {
 218         cout << "Added window: 0x" << hex << rootclients[i] << dec << endl;
 219         _clients.insert(insert_point, new XWindow(_epist, rootclients[i]));
 220       }
 221     }
 222   }
 223
 224   // remove clients that no longer exist
 225   for (it = _clients.begin(); it != end;) {
 226     WindowList::iterator it2 = it++;
 227     for (i = 0; i < num; ++i)
 228       if (**it2 == rootclients[i])
 229         break;
 230     if (i == num)  { // no longer exists
 231       cout << "Removed window: 0x" << hex << (*it2)->window() << dec << endl;
 232       delete *it2;
 233       _clients.erase(it2);
 234     }
 235   }
 236
 237   if (rootclients) delete [] rootclients;
 238 }
 239
 240
 241 void screen::updateActiveWindow() {
 242   assert(_managed);
 243
 244   Window a = None;
 245   _xatom->getValue(_root, XAtom::net_active_window, XAtom::window, a);
 246
 247   WindowList::iterator it, end = _clients.end();
 248   for (it = _clients.begin(); it != end; ++it) {
 249     if (**it == a)
 250       break;
 251   }
 252   _active = it;
 253
 254   cout << "Active window is now: ";
 255   if (_active == _clients.end()) cout << "None\n";
 256   else cout << "0x" << hex << (*_active)->window() << dec << endl;
 257 }
 258
 259 /*
 260  * use this when execing a command to have it on the right screen
 261       string dtmp = (string)"DISPLAY=" + display_name;
 262       if (putenv(const_cast<char*>(dtmp.c_str()))) {
 263         cout << "warning: couldn't set environment variable 'DISPLAY'\n";
 264         perror("putenv()");
 265       }
 266  */
 267
 268 void screen::cycleWorkspace(const bool forward) const {
 269   unsigned long currentDesktop = 0;
 270   unsigned long numDesktops = 0;
 271
 272   if (_xatom->getValue(_root, XAtom::net_current_desktop, XAtom::cardinal,
 273                        currentDesktop)) {
 274     if (forward)
 275       ++currentDesktop;
 276     else
 277       --currentDesktop;
 278
 279     _xatom->getValue(_root, XAtom::net_number_of_desktops, XAtom::cardinal,
 280                      numDesktops);
 281
 282     if ( ( (signed)currentDesktop) == -1)
 283       currentDesktop = numDesktops - 1;
 284     else if (currentDesktop >= numDesktops)
 285       currentDesktop = 0;
 286
 287     changeWorkspace(currentDesktop);
 288   }
 289 }
 290
 291 void screen::changeWorkspace(const int num) const {
 292   _xatom->sendClientMessage(_root, XAtom::net_current_desktop, _root, num);
 293 }
 294
 295 void screen::toggleShaded(const Window win) const {
 296   _xatom->sendClientMessage(_root, XAtom::net_wm_state, win, 2,
 297                             XAtom::net_wm_state_shaded);
 298 }