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   ActionList::const_iterator it = _epist->actions().begin();
 147   ActionList::const_iterator end = _epist->actions().end();
 148   cout << "key press\n";
 149   for (; it != end; ++it) {
 150     if (e.xkey.keycode == it->keycode() &&
 151         e.xkey.state == it->modifierMask()) {
 152       switch (it->type()) {
 153       case Action::nextWorkspace:
 154         cycleWorkspace(true);
 155         break;
 156
 157       case Action::prevWorkspace:
 158         cycleWorkspace(false);
 159         break;
 160
 161       case Action::changeWorkspace:
 162         changeWorkspace(it->number());
 163         break;
 164
 165       case Action::shade:
 166         (*_active)->shade(! (*_active)->shaded());
 167         break;
 168       }
 169
 170       break;
 171     }
 172   }
 173 }
 174
 175 // do we want to add this window to our list?
 176 bool screen::doAddWindow(Window window) const {
 177   assert(_managed);
 178
 179   Atom type;
 180   if (! _xatom->getValue(window, XAtom::net_wm_window_type, XAtom::atom,
 181                          type))
 182     return True;
 183
 184   if (type == _xatom->getAtom(XAtom::net_wm_window_type_dock) ||
 185       type == _xatom->getAtom(XAtom::net_wm_window_type_menu))
 186     return False;
 187
 188   return True;
 189 }
 190
 191
 192 void screen::updateClientList() {
 193   assert(_managed);
 194
 195   WindowList::iterator insert_point = _active;
 196   if (insert_point != _clients.end())
 197     ++insert_point; // get to the item client the focused client
 198
 199   // get the client list from the root window
 200   Window *rootclients = 0;
 201   unsigned long num = (unsigned) -1;
 202   if (! _xatom->getValue(_root, XAtom::net_client_list, XAtom::window, num,
 203                          &rootclients)) {
 204     while (! _clients.empty()) {
 205       delete _clients.front();
 206       _clients.erase(_clients.begin());
 207     }
 208     if (rootclients) delete [] rootclients;
 209     return;
 210   }
 211
 212   WindowList::iterator it, end = _clients.end();
 213   unsigned long i;
 214
 215   // insert new clients after the active window
 216   for (i = 0; i < num; ++i) {
 217     for (it = _clients.begin(); it != end; ++it)
 218       if (**it == rootclients[i])
 219         break;
 220     if (it == end) {  // didn't already exist
 221       if (doAddWindow(rootclients[i])) {
 222         cout << "Added window: 0x" << hex << rootclients[i] << dec << endl;
 223         _clients.insert(insert_point, new XWindow(_epist, this,
 224                                                   rootclients[i]));
 225       }
 226     }
 227   }
 228
 229   // remove clients that no longer exist
 230   for (it = _clients.begin(); it != end;) {
 231     WindowList::iterator it2 = it++;
 232     for (i = 0; i < num; ++i)
 233       if (**it2 == rootclients[i])
 234         break;
 235     if (i == num)  { // no longer exists
 236       cout << "Removed window: 0x" << hex << (*it2)->window() << dec << endl;
 237       delete *it2;
 238       _clients.erase(it2);
 239     }
 240   }
 241
 242   if (rootclients) delete [] rootclients;
 243 }
 244
 245
 246 void screen::updateActiveWindow() {
 247   assert(_managed);
 248
 249   Window a = None;
 250   _xatom->getValue(_root, XAtom::net_active_window, XAtom::window, a);
 251
 252   WindowList::iterator it, end = _clients.end();
 253   for (it = _clients.begin(); it != end; ++it) {
 254     if (**it == a)
 255       break;
 256   }
 257   _active = it;
 258
 259   cout << "Active window is now: ";
 260   if (_active == _clients.end()) cout << "None\n";
 261   else cout << "0x" << hex << (*_active)->window() << dec << endl;
 262 }
 263
 264 /*
 265  * use this when execing a command to have it on the right screen
 266       string dtmp = (string)"DISPLAY=" + display_name;
 267       if (putenv(const_cast<char*>(dtmp.c_str()))) {
 268         cout << "warning: couldn't set environment variable 'DISPLAY'\n";
 269         perror("putenv()");
 270       }
 271  */
 272
 273 void screen::cycleWorkspace(const bool forward) const {
 274   unsigned long currentDesktop = 0;
 275   unsigned long numDesktops = 0;
 276
 277   if (_xatom->getValue(_root, XAtom::net_current_desktop, XAtom::cardinal,
 278                        currentDesktop)) {
 279     if (forward)
 280       ++currentDesktop;
 281     else
 282       --currentDesktop;
 283
 284     _xatom->getValue(_root, XAtom::net_number_of_desktops, XAtom::cardinal,
 285                      numDesktops);
 286
 287     if ( ( (signed)currentDesktop) == -1)
 288       currentDesktop = numDesktops - 1;
 289     else if (currentDesktop >= numDesktops)
 290       currentDesktop = 0;
 291
 292     changeWorkspace(currentDesktop);
 293   }
 294 }
 295
 296 void screen::changeWorkspace(const int num) const {
 297   _xatom->sendClientMessage(_root, XAtom::net_current_desktop, _root, num);
 298 }