Dogcows Code - chaz/openbox/blob - src/XAtom.cc

   1 // XAtom.cc for Openbox
   2 // Copyright (c) 2002 - 2002 Ben Jansens (xor at orodu.net)
   3 //
   4 // Permission is hereby granted, free of charge, to any person obtaining a
   5 // copy of this software and associated documentation files (the "Software"),
   6 // to deal in the Software without restriction, including without limitation
   7 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8 // and/or sell copies of the Software, and to permit persons to whom the
   9 // Software is furnished to do so, subject to the following conditions:
  10 //
  11 // The above copyright notice and this permission notice shall be included in
  12 // all copies or substantial portions of the Software.
  13 //
  14 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17 // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  19 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  20 // DEALINGS IN THE SOFTWARE.
  21
  22 #include "../config.h"
  23
  24 #include <assert.h>
  25
  26 #include "XAtom.hh"
  27 #include "Screen.hh"
  28 #include "Util.hh"
  29
  30 XAtom::XAtom(Display *d) {
  31   _display = d;
  32
  33   // make sure asserts fire if there is a problem
  34   memset(_atoms, 0, sizeof(_atoms));
  35
  36   _atoms[cardinal] = XA_CARDINAL;
  37   _atoms[window] = XA_WINDOW;
  38   _atoms[pixmap] = XA_PIXMAP;
  39   _atoms[atom] = XA_ATOM;
  40   _atoms[string] = XA_STRING;
  41   _atoms[utf8_string] = create("UTF8_STRING");
  42
  43 #ifdef    HAVE_GETPID
  44   _atoms[blackbox_pid] = create("_BLACKBOX_PID");
  45 #endif // HAVE_GETPID
  46
  47   _atoms[wm_colormap_windows] = create("WM_COLORMAP_WINDOWS");
  48   _atoms[wm_protocols] = create("WM_PROTOCOLS");
  49   _atoms[wm_state] = create("WM_STATE");
  50   _atoms[wm_change_state] = create("WM_CHANGE_STATE");
  51   _atoms[wm_delete_window] = create("WM_DELETE_WINDOW");
  52   _atoms[wm_take_focus] = create("WM_TAKE_FOCUS");
  53   _atoms[wm_name] = create("WM_NAME");
  54   _atoms[wm_icon_name] = create("WM_ICON_NAME");
  55   _atoms[wm_class] = create("WM_CLASS");
  56   _atoms[motif_wm_hints] = create("_MOTIF_WM_HINTS");
  57   _atoms[blackbox_hints] = create("_BLACKBOX_HINTS");
  58   _atoms[blackbox_attributes] = create("_BLACKBOX_ATTRIBUTES");
  59   _atoms[blackbox_change_attributes] = create("_BLACKBOX_CHANGE_ATTRIBUTES");
  60   _atoms[blackbox_structure_messages] = create("_BLACKBOX_STRUCTURE_MESSAGES");
  61   _atoms[blackbox_notify_startup] = create("_BLACKBOX_NOTIFY_STARTUP");
  62   _atoms[blackbox_notify_window_add] = create("_BLACKBOX_NOTIFY_WINDOW_ADD");
  63   _atoms[blackbox_notify_window_del] = create("_BLACKBOX_NOTIFY_WINDOW_DEL");
  64   _atoms[blackbox_notify_current_workspace] =
  65     create("_BLACKBOX_NOTIFY_CURRENT_WORKSPACE");
  66   _atoms[blackbox_notify_workspace_count] =
  67     create("_BLACKBOX_NOTIFY_WORKSPACE_COUNT");
  68   _atoms[blackbox_notify_window_focus] =
  69     create("_BLACKBOX_NOTIFY_WINDOW_FOCUS");
  70   _atoms[blackbox_notify_window_raise] =
  71     create("_BLACKBOX_NOTIFY_WINDOW_RAISE");
  72   _atoms[blackbox_notify_window_lower] =
  73     create("_BLACKBOX_NOTIFY_WINDOW_LOWER");
  74
  75   _atoms[blackbox_change_workspace] = create("_BLACKBOX_CHANGE_WORKSPACE");
  76   _atoms[blackbox_change_window_focus] =
  77     create("_BLACKBOX_CHANGE_WINDOW_FOCUS");
  78   _atoms[blackbox_cycle_window_focus] = create("_BLACKBOX_CYCLE_WINDOW_FOCUS");
  79
  80   _atoms[openbox_show_root_menu] = create("_OPENBOX_SHOW_ROOT_MENU");
  81   _atoms[openbox_show_workspace_menu] = create("_OPENBOX_SHOW_WORKSPACE_MENU");
  82
  83   _atoms[net_supported] = create("_NET_SUPPORTED");
  84   _atoms[net_client_list] = create("_NET_CLIENT_LIST");
  85   _atoms[net_client_list_stacking] = create("_NET_CLIENT_LIST_STACKING");
  86   _atoms[net_number_of_desktops] = create("_NET_NUMBER_OF_DESKTOPS");
  87   _atoms[net_desktop_geometry] = create("_NET_DESKTOP_GEOMETRY");
  88   _atoms[net_desktop_viewport] = create("_NET_DESKTOP_VIEWPORT");
  89   _atoms[net_current_desktop] = create("_NET_CURRENT_DESKTOP");
  90   _atoms[net_desktop_names] = create("_NET_DESKTOP_NAMES");
  91   _atoms[net_active_window] = create("_NET_ACTIVE_WINDOW");
  92   _atoms[net_workarea] = create("_NET_WORKAREA");
  93   _atoms[net_supporting_wm_check] = create("_NET_SUPPORTING_WM_CHECK");
  94 //  _atoms[net_virtual_roots] = create("_NET_VIRTUAL_ROOTS");
  95
  96   _atoms[net_close_window] = create("_NET_CLOSE_WINDOW");
  97   _atoms[net_wm_moveresize] = create("_NET_WM_MOVERESIZE");
  98
  99 //  _atoms[net_properties] = create("_NET_PROPERTIES");
 100   _atoms[net_wm_name] = create("_NET_WM_NAME");
 101   _atoms[net_wm_visible_name] = create("_NET_WM_VISIBLE_NAME");
 102   _atoms[net_wm_icon_name] = create("_NET_WM_ICON_NAME");
 103   _atoms[net_wm_visible_icon_name] = create("_NET_WM_VISIBLE_ICON_NAME");
 104   _atoms[net_wm_desktop] = create("_NET_WM_DESKTOP");
 105   _atoms[net_wm_window_type] = create("_NET_WM_WINDOW_TYPE");
 106   _atoms[net_wm_state] = create("_NET_WM_STATE");
 107   _atoms[net_wm_strut] = create("_NET_WM_STRUT");
 108 //  _atoms[net_wm_icon_geometry] = create("_NET_WM_ICON_GEOMETRY");
 109 //  _atoms[net_wm_icon] = create("_NET_WM_ICON");
 110 //  _atoms[net_wm_pid] = create("_NET_WM_PID");
 111 //  _atoms[net_wm_handled_icons] = create("_NET_WM_HANDLED_ICONS");
 112   _atoms[net_wm_allowed_actions] = create("_NET_WM_ALLOWED_ACTIONS");
 113
 114 //  _atoms[net_wm_ping] = create("_NET_WM_PING");
 115
 116   _atoms[net_wm_window_type_desktop] = create("_NET_WM_WINDOW_TYPE_DESKTOP");
 117   _atoms[net_wm_window_type_dock] = create("_NET_WM_WINDOW_TYPE_DOCK");
 118   _atoms[net_wm_window_type_toolbar] = create("_NET_WM_WINDOW_TYPE_TOOLBAR");
 119   _atoms[net_wm_window_type_menu] = create("_NET_WM_WINDOW_TYPE_MENU");
 120   _atoms[net_wm_window_type_utility] = create("_NET_WM_WINDOW_TYPE_UTILITY");
 121   _atoms[net_wm_window_type_splash] = create("_NET_WM_WINDOW_TYPE_SPLASH");
 122   _atoms[net_wm_window_type_dialog] = create("_NET_WM_WINDOW_TYPE_DIALOG");
 123   _atoms[net_wm_window_type_normal] = create("_NET_WM_WINDOW_TYPE_NORMAL");
 124
 125   _atoms[net_wm_moveresize_size_topleft] =
 126     create("_NET_WM_MOVERESIZE_SIZE_TOPLEFT");
 127   _atoms[net_wm_moveresize_size_topright] =
 128     create("_NET_WM_MOVERESIZE_SIZE_TOPRIGHT");
 129   _atoms[net_wm_moveresize_size_bottomleft] =
 130     create("_NET_WM_MOVERESIZE_SIZE_BOTTOMLEFT");
 131   _atoms[net_wm_moveresize_size_bottomright] =
 132     create("_NET_WM_MOVERESIZE_SIZE_BOTTOMRIGHT");
 133   _atoms[net_wm_moveresize_move] =
 134     create("_NET_WM_MOVERESIZE_MOVE");
 135
 136   _atoms[net_wm_action_move] = create("_NET_WM_ACTION_MOVE");
 137   _atoms[net_wm_action_resize] = create("_NET_WM_ACTION_RESIZE");
 138   _atoms[net_wm_action_shade] = create("_NET_WM_ACTION_SHADE");
 139   _atoms[net_wm_action_maximize_horz] = create("_NET_WM_ACTION_MAXIMIZE_HORZ");
 140   _atoms[net_wm_action_maximize_vert] = create("_NET_WM_ACTION_MAXIMIZE_VERT");
 141   _atoms[net_wm_action_change_desktop] =
 142     create("_NET_WM_ACTION_CHANGE_DESKTOP");
 143   _atoms[net_wm_action_close] = create("_NET_WM_ACTION_CLOSE");
 144
 145   _atoms[net_wm_state_modal] = create("_NET_WM_STATE_MODAL");
 146   _atoms[net_wm_state_maximized_vert] = create("_NET_WM_STATE_MAXIMIZED_VERT");
 147   _atoms[net_wm_state_maximized_horz] = create("_NET_WM_STATE_MAXIMIZED_HORZ");
 148   _atoms[net_wm_state_shaded] = create("_NET_WM_STATE_SHADED");
 149   _atoms[net_wm_state_skip_taskbar] = create("_NET_WM_STATE_SKIP_TASKBAR");
 150   _atoms[net_wm_state_skip_pager] = create("_NET_WM_STATE_SKIP_PAGER");
 151   _atoms[net_wm_state_hidden] = create("_NET_WM_STATE_HIDDEN");
 152   _atoms[net_wm_state_fullscreen] = create("_NET_WM_STATE_FULLSCREEN");
 153
 154   _atoms[kde_net_system_tray_windows] = create("_KDE_NET_SYSTEM_TRAY_WINDOWS");
 155   _atoms[kde_net_wm_system_tray_window_for] =
 156     create("_KDE_NET_WM_SYSTEM_TRAY_WINDOW_FOR");
 157   _atoms[kde_net_wm_window_type_override] =
 158     create("_KDE_NET_WM_WINDOW_TYPE_OVERRIDE");
 159 }
 160
 161
 162 /*
 163  * clean up the class' members
 164  */
 165 XAtom::~XAtom() {
 166   while (!_support_windows.empty()) {
 167     // make sure we aren't fucking with this somewhere
 168     assert(_support_windows.back() != None);
 169     XDestroyWindow(_display, _support_windows.back());
 170     _support_windows.pop_back();
 171   }
 172 }
 173
 174
 175 /*
 176  * Returns an atom from the Xserver, creating it if necessary.
 177  */
 178 Atom XAtom::create(const char *name) const {
 179   return XInternAtom(_display, name, False);
 180 }
 181
 182
 183 /*
 184  * Sets which atoms are supported for NETWM, by Openbox, on the root window.
 185  */
 186 void XAtom::setSupported(const ScreenInfo *screen) {
 187   Window root = screen->getRootWindow();
 188
 189   // create the netwm support window
 190   Window w = XCreateSimpleWindow(_display, root, 0, 0, 1, 1, 0, 0, 0);
 191   assert(w != None);
 192   _support_windows.push_back(w);
 193
 194   // set supporting window
 195   setValue(root, net_supporting_wm_check, window, w);
 196
 197   //set properties on the supporting window
 198   setValue(w, net_wm_name, utf8, "Openbox");
 199   setValue(w, net_supporting_wm_check, window, w);
 200
 201   // we don't support any yet..
 202   // yes we do!
 203
 204   Atom supported[] = {
 205     _atoms[net_current_desktop],
 206     _atoms[net_number_of_desktops],
 207     _atoms[net_desktop_geometry],
 208     _atoms[net_desktop_viewport],
 209     _atoms[net_active_window],
 210     _atoms[net_workarea],
 211     _atoms[net_client_list],
 212     _atoms[net_client_list_stacking],
 213     _atoms[net_desktop_names],
 214     _atoms[net_close_window],
 215     _atoms[net_wm_name],
 216     _atoms[net_wm_visible_name],
 217     _atoms[net_wm_icon_name],
 218     _atoms[net_wm_visible_icon_name],
 219     _atoms[net_wm_desktop],
 220     _atoms[net_wm_strut],
 221     _atoms[net_wm_window_type],
 222     _atoms[net_wm_window_type_desktop],
 223     _atoms[net_wm_window_type_dock],
 224     _atoms[net_wm_window_type_toolbar],
 225     _atoms[net_wm_window_type_menu],
 226     _atoms[net_wm_window_type_utility],
 227     _atoms[net_wm_window_type_splash],
 228     _atoms[net_wm_window_type_dialog],
 229     _atoms[net_wm_window_type_normal],
 230     _atoms[net_wm_moveresize],
 231     _atoms[net_wm_moveresize_size_topleft],
 232     _atoms[net_wm_moveresize_size_topright],
 233     _atoms[net_wm_moveresize_size_bottomleft],
 234     _atoms[net_wm_moveresize_size_bottomright],
 235     _atoms[net_wm_moveresize_move],
 236     _atoms[net_wm_allowed_actions],
 237     _atoms[net_wm_action_move],
 238     _atoms[net_wm_action_resize],
 239     _atoms[net_wm_action_shade],
 240     _atoms[net_wm_action_maximize_horz],
 241     _atoms[net_wm_action_maximize_vert],
 242     _atoms[net_wm_action_change_desktop],
 243     _atoms[net_wm_action_close],
 244     _atoms[net_wm_state],
 245     _atoms[net_wm_state_modal],
 246     _atoms[net_wm_state_maximized_vert],
 247     _atoms[net_wm_state_maximized_horz],
 248     _atoms[net_wm_state_shaded],
 249     _atoms[net_wm_state_skip_taskbar],
 250     _atoms[net_wm_state_skip_pager],
 251     _atoms[net_wm_state_hidden],
 252     _atoms[net_wm_state_fullscreen],
 253   };
 254   const int num_supported = sizeof(supported)/sizeof(Atom);
 255
 256   setValue(root, net_supported, atom, supported, num_supported);
 257 }
 258
 259
 260 /*
 261  * Internal setValue.
 262  * Sets a window property on a window, optionally appending to the existing
 263  * value.
 264  */
 265 void XAtom::setValue(Window win, Atom atom, Atom type,
 266                      unsigned char* data, int size, int nelements,
 267                      bool append) const {
 268   assert(win != None); assert(atom != None); assert(type != None);
 269   assert(nelements == 0 || (nelements > 0 && data != (unsigned char *) 0));
 270   assert(size == 8 || size == 16 || size == 32);
 271   XChangeProperty(_display, win, atom, type, size,
 272                   (append ? PropModeAppend : PropModeReplace),
 273                   data, nelements);
 274 }
 275
 276
 277 /*
 278  * Set a 32-bit property value on a window.
 279  */
 280 void XAtom::setValue(Window win, Atoms atom, Atoms type,
 281                      unsigned long value) const {
 282   assert(atom >= 0 && atom < NUM_ATOMS);
 283   assert(type >= 0 && type < NUM_ATOMS);
 284   setValue(win, _atoms[atom], _atoms[type],
 285            reinterpret_cast<unsigned char*>(&value), 32, 1, False);
 286 }
 287
 288
 289 /*
 290  * Set an array of 32-bit properties value on a window.
 291  */
 292 void XAtom::setValue(Window win, Atoms atom, Atoms type,
 293                      unsigned long value[], int elements) const {
 294   assert(atom >= 0 && atom < NUM_ATOMS);
 295   assert(type >= 0 && type < NUM_ATOMS);
 296   setValue(win, _atoms[atom], _atoms[type],
 297            reinterpret_cast<unsigned char*>(value), 32, elements, False);
 298 }
 299
 300
 301 /*
 302  * Set an string property value on a window.
 303  */
 304 void XAtom::setValue(Window win, Atoms atom, StringType type,
 305                      const std::string &value) const {
 306   assert(atom >= 0 && atom < NUM_ATOMS);
 307   assert(type >= 0 && type < NUM_STRING_TYPE);
 308
 309   Atom t;
 310   switch (type) {
 311   case ansi: t = _atoms[string]; break;
 312   case utf8: t = _atoms[utf8_string]; break;
 313   default: assert(False); return; // unhandled StringType
 314   }
 315   setValue(win, _atoms[atom], t,
 316            reinterpret_cast<unsigned char *>(const_cast<char *>(value.c_str())),
 317            8, value.size() + 1, False); // add 1 to the size to include the null
 318 }
 319
 320
 321 /*
 322  * Set an array of string property values on a window.
 323  */
 324 void XAtom::setValue(Window win, Atoms atom, StringType type,
 325                      const StringVect &strings) const {
 326   assert(atom >= 0 && atom < NUM_ATOMS);
 327   assert(type >= 0 && type < NUM_STRING_TYPE);
 328
 329   Atom t;
 330   switch (type) {
 331   case ansi: t = _atoms[string]; break;
 332   case utf8: t = _atoms[utf8_string]; break;
 333   default: assert(False); return; // unhandled StringType
 334   }
 335
 336   std::string value;
 337
 338   StringVect::const_iterator it = strings.begin();
 339   const StringVect::const_iterator end = strings.end();
 340   for (; it != end; ++it)
 341       value += *it + '\0';
 342
 343   setValue(win, _atoms[atom], t,
 344            reinterpret_cast<unsigned char *>(const_cast<char *>(value.c_str())),
 345            8, value.size(), False);
 346 }
 347
 348
 349 /*
 350  * Internal getValue function used by all of the typed getValue functions.
 351  * Gets an property's value from a window.
 352  * Returns True if the property was successfully retrieved; False if the
 353  * property did not exist on the window, or has a different type/size format
 354  * than the user tried to retrieve.
 355  */
 356 bool XAtom::getValue(Window win, Atom atom, Atom type,
 357                      unsigned long &nelements, unsigned char **value,
 358                      int size) const {
 359   assert(win != None); assert(atom != None); assert(type != None);
 360   assert(size == 8 || size == 16 || size == 32);
 361   assert(nelements > 0);
 362   unsigned char *c_val = 0;        // value alloc'd in Xlib, must be XFree()d
 363   Atom ret_type;
 364   int ret_size;
 365   unsigned long ret_bytes;
 366   int result;
 367   const unsigned long maxread = nelements;
 368   // try get the first element
 369   result = XGetWindowProperty(_display, win, atom, 0l, 1l, False,
 370                               AnyPropertyType, &ret_type, &ret_size,
 371                               &nelements, &ret_bytes, &c_val);
 372   if (result != Success || ret_type != type || ret_size != size ||
 373       nelements < 1) {
 374     // an error occured, the property does not exist on the window, or is empty,
 375     // or the wrong data is in property for the request
 376     if (c_val) XFree(c_val);
 377     return False;
 378   }
 379   // the data is correct, now, is there more elements left?
 380   if (ret_bytes == 0 || maxread <= nelements) {
 381     // we got the whole property's value
 382     *value = new unsigned char[nelements * size/8 + 1];
 383     memcpy(*value, c_val, nelements * size/8 + 1);
 384     XFree(c_val);
 385     return True;
 386   }
 387   // get the entire property since it is larger than one long
 388   XFree(c_val);
 389   // the number of longs that need to be retreived to get the property's entire
 390   // value. The last + 1 is the first long that we retrieved above.
 391   int remain = (ret_bytes - 1)/sizeof(long) + 1 + 1;
 392   if (remain > size/8 * (signed)maxread) // dont get more than the max
 393     remain = size/8 * (signed)maxread;
 394   result = XGetWindowProperty(_display, win, atom, 0l, remain, False, type,
 395                               &ret_type, &ret_size, &nelements, &ret_bytes,
 396                               &c_val);
 397   assert(result == Success);
 398   assert(ret_bytes == 0);
 399   *value = new unsigned char[nelements * size/8 + 1];
 400   memcpy(*value, c_val, nelements * size/8 + 1);
 401   XFree(c_val);
 402   return True;
 403 }
 404
 405
 406 /*
 407  * Gets a 32-bit property's value from a window.
 408  */
 409 bool XAtom::getValue(Window win, Atoms atom, Atoms type,
 410                          unsigned long &nelements,
 411                          unsigned long **value) const {
 412   assert(atom >= 0 && atom < NUM_ATOMS);
 413   assert(type >= 0 && type < NUM_ATOMS);
 414   return getValue(win, _atoms[atom], _atoms[type], nelements,
 415                   reinterpret_cast<unsigned char **>(value), 32);
 416 }
 417
 418
 419 /*
 420  * Gets a single 32-bit property's value from a window.
 421  */
 422 bool XAtom::getValue(Window win, Atoms atom, Atoms type,
 423                      unsigned long &value) const {
 424   assert(atom >= 0 && atom < NUM_ATOMS);
 425   assert(type >= 0 && type < NUM_ATOMS);
 426   unsigned long *temp;
 427   unsigned long num = 1;
 428   if (! getValue(win, _atoms[atom], _atoms[type], num,
 429                  reinterpret_cast<unsigned char **>(&temp), 32))
 430     return False;
 431   value = temp[0];
 432   delete [] temp;
 433   return True;
 434 }
 435
 436
 437 /*
 438  * Gets an string property's value from a window.
 439  */
 440 bool XAtom::getValue(Window win, Atoms atom, StringType type,
 441                      std::string &value) const {
 442   unsigned long n = 1;
 443   StringVect s;
 444   if (getValue(win, atom, type, n, s)) {
 445     value = s[0];
 446     return True;
 447   }
 448   return False;
 449 }
 450
 451
 452 bool XAtom::getValue(Window win, Atoms atom, StringType type,
 453                      unsigned long &nelements, StringVect &strings) const {
 454   assert(atom >= 0 && atom < NUM_ATOMS);
 455   assert(type >= 0 && type < NUM_STRING_TYPE);
 456   assert(win != None); assert(_atoms[atom] != None);
 457   assert(nelements > 0);
 458
 459   Atom t;
 460   switch (type) {
 461   case ansi: t = _atoms[string]; break;
 462   case utf8: t = _atoms[utf8_string]; break;
 463   default: assert(False); return False; // unhandled StringType
 464   }
 465
 466   unsigned char *value;
 467   unsigned long elements = (unsigned) -1;
 468   if (!getValue(win, _atoms[atom], t, elements, &value, 8) || elements < 1)
 469     return False;
 470
 471   std::string s(reinterpret_cast<char *>(value), elements);
 472   delete [] value;
 473
 474   std::string::const_iterator it = s.begin(), end = s.end();
 475   unsigned long num = 0;
 476   while(num < nelements) {
 477     std::string::const_iterator tmp = it; // current string.begin()
 478     it = std::find(tmp, end, '\0');       // look for null between tmp and end
 479     strings.push_back(std::string(tmp, it));   // s[tmp:it)
 480     ++num;
 481     if (it == end) break;
 482     ++it;
 483     if (it == end) break;
 484   }
 485
 486   nelements = num;
 487
 488   return True;
 489 }
 490
 491
 492 /*
 493  * Removes a property entirely from a window.
 494  */
 495 void XAtom::eraseValue(Window win, Atoms atom) const {
 496   assert(atom >= 0 && atom < NUM_ATOMS);
 497   XDeleteProperty(_display, win, _atoms[atom]);
 498 }
 499
 500
 501 void XAtom::sendClientMessage(Window target, Atoms type, Window about,
 502                               long data, long data1, long data2,
 503                               long data3, long data4) const {
 504   assert(atom >= 0 && atom < NUM_ATOMS);
 505   assert(target != None);
 506
 507   XEvent e;
 508   e.xclient.type = ClientMessage;
 509   e.xclient.format = 32;
 510   e.xclient.message_type = _atoms[type];
 511   e.xclient.window = about;
 512   e.xclient.data.l[0] = data;
 513   e.xclient.data.l[1] = data1;
 514   e.xclient.data.l[2] = data2;
 515   e.xclient.data.l[3] = data3;
 516   e.xclient.data.l[4] = data4;
 517
 518   XSendEvent(_display, target, False,
 519              SubstructureRedirectMask | SubstructureNotifyMask,
 520              &e);
 521 }