openbox/screen.c

   1 /* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
   2
   3    screen.c for the Openbox window manager
   4    Copyright (c) 2006        Mikael Magnusson
   5    Copyright (c) 2003-2007   Dana Jansens
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    See the COPYING file for a copy of the GNU General Public License.
  18 */
  19
  20 #include "debug.h"
  21 #include "openbox.h"
  22 #include "dock.h"
  23 #include "grab.h"
  24 #include "startupnotify.h"
  25 #include "moveresize.h"
  26 #include "config.h"
  27 #include "screen.h"
  28 #include "client.h"
  29 #include "session.h"
  30 #include "engine_interface.h"
  31 #include "event.h"
  32 #include "focus.h"
  33 #include "popup.h"
  34 #include "render/render.h"
  35 #include "gettext.h"
  36 #include "obt/display.h"
  37 #include "obt/prop.h"
  38 #include "obt/mainloop.h"
  39
  40 #include <X11/Xlib.h>
  41 #ifdef HAVE_UNISTD_H
  42 #  include <sys/types.h>
  43 #  include <unistd.h>
  44 #endif
  45 #include <assert.h>
  46
  47 /*! The event mask to grab on the root window */
  48 #define ROOT_EVENTMASK (StructureNotifyMask | PropertyChangeMask | \
  49                         EnterWindowMask | LeaveWindowMask | \
  50                         SubstructureRedirectMask | FocusChangeMask | \
  51                         ButtonPressMask | ButtonReleaseMask)
  52
  53 static gboolean screen_validate_layout(ObDesktopLayout *l);
  54 static gboolean replace_wm(void);
  55 static void     screen_tell_ksplash(void);
  56 static void     screen_fallback_focus(void);
  57
  58 guint    screen_num_desktops;
  59 guint    screen_num_monitors;
  60 guint    screen_desktop;
  61 guint    screen_last_desktop;
  62 gboolean screen_showing_desktop;
  63 ObDesktopLayout screen_desktop_layout;
  64 gchar  **screen_desktop_names;
  65 Window   screen_support_win;
  66 Time     screen_desktop_user_time = CurrentTime;
  67
  68 static Size     screen_physical_size;
  69 static guint    screen_old_desktop;
  70 static gboolean screen_desktop_timeout = TRUE;
  71 /*! An array of desktops, holding array of areas per monitor */
  72 static Rect  *monitor_area = NULL;
  73 /*! An array of desktops, holding an array of struts */
  74 static GSList *struts_top = NULL;
  75 static GSList *struts_left = NULL;
  76 static GSList *struts_right = NULL;
  77 static GSList *struts_bottom = NULL;
  78
  79 static ObPagerPopup *desktop_popup;
  80
  81 /*! The number of microseconds that you need to be on a desktop before it will
  82   replace the remembered "last desktop" */
  83 #define REMEMBER_LAST_DESKTOP_TIME 750000
  84
  85 static gboolean replace_wm(void)
  86 {
  87     gchar *wm_sn;
  88     Atom wm_sn_atom;
  89     Window current_wm_sn_owner;
  90     Time timestamp;
  91
  92     wm_sn = g_strdup_printf("WM_S%d", ob_screen);
  93     wm_sn_atom = XInternAtom(obt_display, wm_sn, FALSE);
  94     g_free(wm_sn);
  95
  96     current_wm_sn_owner = XGetSelectionOwner(obt_display, wm_sn_atom);
  97     if (current_wm_sn_owner == screen_support_win)
  98         current_wm_sn_owner = None;
  99     if (current_wm_sn_owner) {
 100         if (!ob_replace_wm) {
 101             g_message(_("A window manager is already running on screen %d"),
 102                       ob_screen);
 103             return FALSE;
 104         }
 105         obt_display_ignore_errors(TRUE);
 106
 107         /* We want to find out when the current selection owner dies */
 108         XSelectInput(obt_display, current_wm_sn_owner, StructureNotifyMask);
 109         XSync(obt_display, FALSE);
 110
 111         obt_display_ignore_errors(FALSE);
 112         if (obt_display_error_occured)
 113             current_wm_sn_owner = None;
 114     }
 115
 116     timestamp = event_get_server_time();
 117
 118     XSetSelectionOwner(obt_display, wm_sn_atom, screen_support_win,
 119                        timestamp);
 120
 121     if (XGetSelectionOwner(obt_display, wm_sn_atom) != screen_support_win) {
 122         g_message(_("Could not acquire window manager selection on screen %d"),
 123                   ob_screen);
 124         return FALSE;
 125     }
 126
 127     /* Wait for old window manager to go away */
 128     if (current_wm_sn_owner) {
 129       XEvent event;
 130       gulong wait = 0;
 131       const gulong timeout = G_USEC_PER_SEC * 15; /* wait for 15s max */
 132
 133       while (wait < timeout) {
 134           if (XCheckWindowEvent(obt_display, current_wm_sn_owner,
 135                                 StructureNotifyMask, &event) &&
 136               event.type == DestroyNotify)
 137               break;
 138           g_usleep(G_USEC_PER_SEC / 10);
 139           wait += G_USEC_PER_SEC / 10;
 140       }
 141
 142       if (wait >= timeout) {
 143           g_message(_("The WM on screen %d is not exiting"), ob_screen);
 144           return FALSE;
 145       }
 146     }
 147
 148     /* Send client message indicating that we are now the WM */
 149     obt_prop_message(ob_screen, obt_root(ob_screen), OBT_PROP_ATOM(MANAGER),
 150                      timestamp, wm_sn_atom, screen_support_win, 0, 0,
 151                      SubstructureNotifyMask);
 152
 153     return TRUE;
 154 }
 155
 156 gboolean screen_annex(void)
 157 {
 158     XSetWindowAttributes attrib;
 159     pid_t pid;
 160     gint i, num_support;
 161     gulong *supported;
 162
 163     /* create the netwm support window */
 164     attrib.override_redirect = TRUE;
 165     attrib.event_mask = PropertyChangeMask;
 166     screen_support_win = XCreateWindow(obt_display, obt_root(ob_screen),
 167                                        -100, -100, 1, 1, 0,
 168                                        CopyFromParent, InputOutput,
 169                                        CopyFromParent,
 170                                        CWEventMask | CWOverrideRedirect,
 171                                        &attrib);
 172     XMapWindow(obt_display, screen_support_win);
 173     XLowerWindow(obt_display, screen_support_win);
 174
 175     if (!replace_wm()) {
 176         XDestroyWindow(obt_display, screen_support_win);
 177         return FALSE;
 178     }
 179
 180     obt_display_ignore_errors(TRUE);
 181     XSelectInput(obt_display, obt_root(ob_screen), ROOT_EVENTMASK);
 182     obt_display_ignore_errors(FALSE);
 183     if (obt_display_error_occured) {
 184         g_message(_("A window manager is already running on screen %d"),
 185                   ob_screen);
 186
 187         XDestroyWindow(obt_display, screen_support_win);
 188         return FALSE;
 189     }
 190
 191     screen_set_root_cursor();
 192
 193     /* set the OPENBOX_PID hint */
 194     pid = getpid();
 195     OBT_PROP_SET32(obt_root(ob_screen), OPENBOX_PID, CARDINAL, pid);
 196
 197     /* set supporting window */
 198     OBT_PROP_SET32(obt_root(ob_screen),
 199                    NET_SUPPORTING_WM_CHECK, WINDOW, screen_support_win);
 200
 201     /* set properties on the supporting window */
 202     OBT_PROP_SETS(screen_support_win, NET_WM_NAME, utf8, "Openbox");
 203     OBT_PROP_SET32(screen_support_win, NET_SUPPORTING_WM_CHECK,
 204                    WINDOW, screen_support_win);
 205
 206     /* set the _NET_SUPPORTED_ATOMS hint */
 207
 208     /* this is all the atoms after NET_SUPPORTED in the ObtPropAtoms enum */
 209     num_support = OBT_PROP_NUM_ATOMS - OBT_PROP_NET_SUPPORTED - 1;
 210     i = 0;
 211     supported = g_new(gulong, num_support);
 212     supported[i++] = OBT_PROP_ATOM(NET_SUPPORTING_WM_CHECK);
 213     supported[i++] = OBT_PROP_ATOM(NET_WM_FULL_PLACEMENT);
 214     supported[i++] = OBT_PROP_ATOM(NET_CURRENT_DESKTOP);
 215     supported[i++] = OBT_PROP_ATOM(NET_NUMBER_OF_DESKTOPS);
 216     supported[i++] = OBT_PROP_ATOM(NET_DESKTOP_GEOMETRY);
 217     supported[i++] = OBT_PROP_ATOM(NET_DESKTOP_VIEWPORT);
 218     supported[i++] = OBT_PROP_ATOM(NET_ACTIVE_WINDOW);
 219     supported[i++] = OBT_PROP_ATOM(NET_WORKAREA);
 220     supported[i++] = OBT_PROP_ATOM(NET_CLIENT_LIST);
 221     supported[i++] = OBT_PROP_ATOM(NET_CLIENT_LIST_STACKING);
 222     supported[i++] = OBT_PROP_ATOM(NET_DESKTOP_NAMES);
 223     supported[i++] = OBT_PROP_ATOM(NET_CLOSE_WINDOW);
 224     supported[i++] = OBT_PROP_ATOM(NET_DESKTOP_LAYOUT);
 225     supported[i++] = OBT_PROP_ATOM(NET_SHOWING_DESKTOP);
 226     supported[i++] = OBT_PROP_ATOM(NET_WM_NAME);
 227     supported[i++] = OBT_PROP_ATOM(NET_WM_VISIBLE_NAME);
 228     supported[i++] = OBT_PROP_ATOM(NET_WM_ICON_NAME);
 229     supported[i++] = OBT_PROP_ATOM(NET_WM_VISIBLE_ICON_NAME);
 230     supported[i++] = OBT_PROP_ATOM(NET_WM_DESKTOP);
 231     supported[i++] = OBT_PROP_ATOM(NET_WM_STRUT);
 232     supported[i++] = OBT_PROP_ATOM(NET_WM_STRUT_PARTIAL);
 233     supported[i++] = OBT_PROP_ATOM(NET_WM_ICON);
 234     supported[i++] = OBT_PROP_ATOM(NET_WM_ICON_GEOMETRY);
 235     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE);
 236     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE_DESKTOP);
 237     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE_DOCK);
 238     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE_TOOLBAR);
 239     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE_MENU);
 240     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE_UTILITY);
 241     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE_SPLASH);
 242     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE_DIALOG);
 243     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE_NORMAL);
 244     supported[i++] = OBT_PROP_ATOM(NET_WM_ALLOWED_ACTIONS);
 245     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_MOVE);
 246     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_RESIZE);
 247     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_MINIMIZE);
 248     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_SHADE);
 249     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_MAXIMIZE_HORZ);
 250     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_MAXIMIZE_VERT);
 251     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_FULLSCREEN);
 252     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_CHANGE_DESKTOP);
 253     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_CLOSE);
 254     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_ABOVE);
 255     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_BELOW);
 256     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE);
 257     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_MODAL);
 258     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_MAXIMIZED_VERT);
 259     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_MAXIMIZED_HORZ);
 260     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_SHADED);
 261     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_SKIP_TASKBAR);
 262     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_SKIP_PAGER);
 263     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_HIDDEN);
 264     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_FULLSCREEN);
 265     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_ABOVE);
 266     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_BELOW);
 267     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_DEMANDS_ATTENTION);
 268     supported[i++] = OBT_PROP_ATOM(NET_MOVERESIZE_WINDOW);
 269     supported[i++] = OBT_PROP_ATOM(NET_WM_MOVERESIZE);
 270     supported[i++] = OBT_PROP_ATOM(NET_WM_USER_TIME);
 271 /*
 272     supported[i++] = OBT_PROP_ATOM(NET_WM_USER_TIME_WINDOW);
 273 */
 274     supported[i++] = OBT_PROP_ATOM(NET_FRAME_EXTENTS);
 275     supported[i++] = OBT_PROP_ATOM(NET_REQUEST_FRAME_EXTENTS);
 276     supported[i++] = OBT_PROP_ATOM(NET_RESTACK_WINDOW);
 277     supported[i++] = OBT_PROP_ATOM(NET_STARTUP_ID);
 278 #ifdef SYNC
 279     supported[i++] = OBT_PROP_ATOM(NET_WM_SYNC_REQUEST);
 280     supported[i++] = OBT_PROP_ATOM(NET_WM_SYNC_REQUEST_COUNTER);
 281 #endif
 282     supported[i++] = OBT_PROP_ATOM(NET_WM_PID);
 283     supported[i++] = OBT_PROP_ATOM(NET_WM_PING);
 284
 285     supported[i++] = OBT_PROP_ATOM(KDE_WM_CHANGE_STATE);
 286     supported[i++] = OBT_PROP_ATOM(KDE_NET_WM_FRAME_STRUT);
 287     supported[i++] = OBT_PROP_ATOM(KDE_NET_WM_WINDOW_TYPE_OVERRIDE);
 288
 289     supported[i++] = OBT_PROP_ATOM(OB_WM_ACTION_UNDECORATE);
 290     supported[i++] = OBT_PROP_ATOM(OB_WM_STATE_UNDECORATED);
 291     supported[i++] = OBT_PROP_ATOM(OPENBOX_PID);
 292     supported[i++] = OBT_PROP_ATOM(OB_THEME);
 293     supported[i++] = OBT_PROP_ATOM(OB_CONFIG_FILE);
 294     supported[i++] = OBT_PROP_ATOM(OB_CONTROL);
 295     g_assert(i == num_support);
 296
 297     OBT_PROP_SETA32(obt_root(ob_screen),
 298                     NET_SUPPORTED, ATOM, supported, num_support);
 299     g_free(supported);
 300
 301     screen_tell_ksplash();
 302
 303     return TRUE;
 304 }
 305
 306 static void screen_tell_ksplash(void)
 307 {
 308     XEvent e;
 309     char **argv;
 310
 311     argv = g_new(gchar*, 6);
 312     argv[0] = g_strdup("dcop");
 313     argv[1] = g_strdup("ksplash");
 314     argv[2] = g_strdup("ksplash");
 315     argv[3] = g_strdup("upAndRunning(QString)");
 316     argv[4] = g_strdup("wm started");
 317     argv[5] = NULL;
 318
 319     /* tell ksplash through the dcop server command line interface */
 320     g_spawn_async(NULL, argv, NULL,
 321                   G_SPAWN_SEARCH_PATH | G_SPAWN_DO_NOT_REAP_CHILD |
 322                   G_SPAWN_STDERR_TO_DEV_NULL | G_SPAWN_STDOUT_TO_DEV_NULL,
 323                   NULL, NULL, NULL, NULL);
 324     g_strfreev(argv);
 325
 326     /* i'm not sure why we do this, kwin does it, but ksplash doesn't seem to
 327        hear it anyways. perhaps it is for old ksplash. or new ksplash. or
 328        something. oh well. */
 329     e.xclient.type = ClientMessage;
 330     e.xclient.display = obt_display;
 331     e.xclient.window = obt_root(ob_screen);
 332     e.xclient.message_type =
 333         XInternAtom(obt_display, "_KDE_SPLASH_PROGRESS", False );
 334     e.xclient.format = 8;
 335     strcpy(e.xclient.data.b, "wm started");
 336     XSendEvent(obt_display, obt_root(ob_screen),
 337                False, SubstructureNotifyMask, &e);
 338 }
 339
 340 void screen_startup(gboolean reconfig)
 341 {
 342     gchar **names = NULL;
 343     guint32 d;
 344     gboolean namesexist = FALSE;
 345
 346     desktop_popup = pager_popup_new();
 347     pager_popup_height(desktop_popup, POPUP_HEIGHT);
 348
 349     if (reconfig) {
 350         /* update the pager popup's width */
 351         pager_popup_text_width_to_strings(desktop_popup,
 352                                           screen_desktop_names,
 353                                           screen_num_desktops);
 354         return;
 355     }
 356
 357     /* get the initial size */
 358     screen_resize();
 359
 360     /* have names already been set for the desktops? */
 361     if (OBT_PROP_GETSS(obt_root(ob_screen), NET_DESKTOP_NAMES, utf8, &names)) {
 362         g_strfreev(names);
 363         namesexist = TRUE;
 364     }
 365
 366     /* if names don't exist and we have session names, set those.
 367        do this stuff BEFORE setting the number of desktops, because that
 368        will create default names for them
 369     */
 370     if (!namesexist && session_desktop_names != NULL) {
 371         guint i, numnames;
 372         GSList *it;
 373
 374         /* get the desktop names */
 375         numnames = g_slist_length(session_desktop_names);
 376         names = g_new(gchar*, numnames + 1);
 377         names[numnames] = NULL;
 378         for (i = 0, it = session_desktop_names; it; ++i, it = g_slist_next(it))
 379             names[i] = g_strdup(it->data);
 380
 381         /* set the root window property */
 382         OBT_PROP_SETSS(obt_root(ob_screen),
 383                        NET_DESKTOP_NAMES, utf8, (const gchar**)names);
 384
 385         g_strfreev(names);
 386     }
 387
 388     /* set the number of desktops, if it's not already set.
 389
 390        this will also set the default names from the config file up for
 391        desktops that don't have names yet */
 392     screen_num_desktops = 0;
 393     if (OBT_PROP_GET32(obt_root(ob_screen),
 394                        NET_NUMBER_OF_DESKTOPS, CARDINAL, &d))
 395     {
 396         if (d != config_desktops_num) {
 397             g_warning(_("Openbox is configured for %d desktops, but the current session has %d.  Overriding the Openbox configuration."),
 398                       config_desktops_num, d);
 399         }
 400         screen_set_num_desktops(d);
 401     }
 402     /* restore from session if possible */
 403     else if (session_num_desktops)
 404         screen_set_num_desktops(session_num_desktops);
 405     else
 406         screen_set_num_desktops(config_desktops_num);
 407
 408     screen_desktop = screen_num_desktops;  /* something invalid */
 409     /* start on the current desktop when a wm was already running */
 410     if (OBT_PROP_GET32(obt_root(ob_screen),
 411                        NET_CURRENT_DESKTOP, CARDINAL, &d) &&
 412         d < screen_num_desktops)
 413     {
 414         screen_set_desktop(d, FALSE);
 415     } else if (session_desktop >= 0)
 416         screen_set_desktop(MIN((guint)session_desktop,
 417                                screen_num_desktops), FALSE);
 418     else
 419         screen_set_desktop(MIN(config_screen_firstdesk,
 420                                screen_num_desktops) - 1, FALSE);
 421     screen_last_desktop = screen_desktop;
 422
 423     /* don't start in showing-desktop mode */
 424     screen_showing_desktop = FALSE;
 425     OBT_PROP_SET32(obt_root(ob_screen),
 426                    NET_SHOWING_DESKTOP, CARDINAL, screen_showing_desktop);
 427
 428     if (session_desktop_layout_present &&
 429         screen_validate_layout(&session_desktop_layout))
 430     {
 431         screen_desktop_layout = session_desktop_layout;
 432     }
 433     else
 434         screen_update_layout();
 435 }
 436
 437 void screen_shutdown(gboolean reconfig)
 438 {
 439     pager_popup_free(desktop_popup);
 440
 441     if (reconfig)
 442         return;
 443
 444     XSelectInput(obt_display, obt_root(ob_screen), NoEventMask);
 445
 446     /* we're not running here no more! */
 447     OBT_PROP_ERASE(obt_root(ob_screen), OPENBOX_PID);
 448     /* not without us */
 449     OBT_PROP_ERASE(obt_root(ob_screen), NET_SUPPORTED);
 450     /* don't keep this mode */
 451     OBT_PROP_ERASE(obt_root(ob_screen), NET_SHOWING_DESKTOP);
 452
 453     XDestroyWindow(obt_display, screen_support_win);
 454
 455     g_strfreev(screen_desktop_names);
 456     screen_desktop_names = NULL;
 457 }
 458
 459 void screen_resize(void)
 460 {
 461     static gint oldw = 0, oldh = 0;
 462     gint w, h;
 463     GList *it;
 464     gulong geometry[2];
 465
 466     w = WidthOfScreen(ScreenOfDisplay(obt_display, ob_screen));
 467     h = HeightOfScreen(ScreenOfDisplay(obt_display, ob_screen));
 468
 469     if (w == oldw && h == oldh) return;
 470
 471     oldw = w; oldh = h;
 472
 473     /* Set the _NET_DESKTOP_GEOMETRY hint */
 474     screen_physical_size.width = geometry[0] = w;
 475     screen_physical_size.height = geometry[1] = h;
 476     OBT_PROP_SETA32(obt_root(ob_screen),
 477                     NET_DESKTOP_GEOMETRY, CARDINAL, geometry, 2);
 478
 479     if (ob_state() == OB_STATE_STARTING)
 480         return;
 481
 482     screen_update_areas();
 483     dock_configure();
 484
 485     for (it = client_list; it; it = g_list_next(it))
 486         client_move_onscreen(it->data, FALSE);
 487 }
 488
 489 void screen_set_num_desktops(guint num)
 490 {
 491     guint old;
 492     gulong *viewport;
 493     GList *it, *stacking_copy;
 494
 495     g_assert(num > 0);
 496
 497     if (screen_num_desktops == num) return;
 498
 499     old = screen_num_desktops;
 500     screen_num_desktops = num;
 501     OBT_PROP_SET32(obt_root(ob_screen), NET_NUMBER_OF_DESKTOPS, CARDINAL, num);
 502
 503     /* set the viewport hint */
 504     viewport = g_new0(gulong, num * 2);
 505     OBT_PROP_SETA32(obt_root(ob_screen),
 506                     NET_DESKTOP_VIEWPORT, CARDINAL, viewport, num * 2);
 507     g_free(viewport);
 508
 509     /* the number of rows/columns will differ */
 510     screen_update_layout();
 511
 512     /* move windows on desktops that will no longer exist!
 513        make a copy of the list cuz we're changing it */
 514     stacking_copy = g_list_copy(stacking_list);
 515     for (it = g_list_last(stacking_copy); it; it = g_list_previous(it)) {
 516         if (WINDOW_IS_CLIENT(it->data)) {
 517             ObClient *c = it->data;
 518             if (c->desktop != DESKTOP_ALL && c->desktop >= num)
 519                 client_set_desktop(c, num - 1, FALSE, TRUE);
 520             /* raise all the windows that are on the current desktop which
 521                is being merged */
 522             else if (screen_desktop == num - 1 &&
 523                      (c->desktop == DESKTOP_ALL ||
 524                       c->desktop == screen_desktop))
 525                 stacking_raise(CLIENT_AS_WINDOW(c));
 526         }
 527     }
 528
 529     /* change our struts/area to match (after moving windows) */
 530     screen_update_areas();
 531
 532     /* may be some unnamed desktops that we need to fill in with names
 533      (after updating the areas so the popup can resize) */
 534     screen_update_desktop_names();
 535
 536     /* change our desktop if we're on one that no longer exists! */
 537     if (screen_desktop >= screen_num_desktops)
 538         screen_set_desktop(num - 1, TRUE);
 539 }
 540
 541 static void screen_fallback_focus(void)
 542 {
 543     ObClient *c;
 544     gboolean allow_omni;
 545
 546     /* only allow omnipresent windows to get focus on desktop change if
 547        an omnipresent window is already focused (it'll keep focus probably, but
 548        maybe not depending on mouse-focus options) */
 549     allow_omni = focus_client && (client_normal(focus_client) &&
 550                                   focus_client->desktop == DESKTOP_ALL);
 551
 552     /* the client moved there already so don't move focus. prevent flicker
 553        on sendtodesktop + follow */
 554     if (focus_client && focus_client->desktop == screen_desktop)
 555         return;
 556
 557     /* have to try focus here because when you leave an empty desktop
 558        there is no focus out to watch for. also, we have different rules
 559        here. we always allow it to look under the mouse pointer if
 560        config_focus_last is FALSE
 561
 562        do this before hiding the windows so if helper windows are coming
 563        with us, they don't get hidden
 564     */
 565     if ((c = focus_fallback(TRUE, !config_focus_last, allow_omni,
 566                             !allow_omni)))
 567     {
 568         /* only do the flicker reducing stuff ahead of time if we are going
 569            to call xsetinputfocus on the window ourselves. otherwise there is
 570            no guarantee the window will actually take focus.. */
 571         if (c->can_focus) {
 572             /* reduce flicker by hiliting now rather than waiting for the
 573                server FocusIn event */
 574         render_plugin->frame_set_is_focus (c->frame, TRUE);
 575         render_plugin->frame_update_layout (c->frame, FALSE, FALSE);
 576         render_plugin->frame_update_skin (c->frame);
 577             /* do this here so that if you switch desktops to a window with
 578                helper windows then the helper windows won't flash */
 579             client_bring_helper_windows(c);
 580         }
 581     }
 582 }
 583
 584 static gboolean last_desktop_func(gpointer data)
 585 {
 586     screen_desktop_timeout = TRUE;
 587     return FALSE;
 588 }
 589
 590 void screen_set_desktop(guint num, gboolean dofocus)
 591 {
 592     GList *it;
 593     guint previous;
 594     gulong ignore_start;
 595
 596     g_assert(num < screen_num_desktops);
 597
 598     previous = screen_desktop;
 599     screen_desktop = num;
 600
 601     if (previous == num) return;
 602
 603     OBT_PROP_SET32(obt_root(ob_screen), NET_CURRENT_DESKTOP, CARDINAL, num);
 604
 605     /* This whole thing decides when/how to save the screen_last_desktop so
 606        that it can be restored later if you want */
 607     if (screen_desktop_timeout) {
 608         /* If screen_desktop_timeout is true, then we've been on this desktop
 609            long enough and we can save it as the last desktop. */
 610
 611         if (screen_last_desktop == previous)
 612             /* this is the startup state only */
 613             screen_old_desktop = screen_desktop;
 614         else {
 615             /* save the "last desktop" as the "old desktop" */
 616             screen_old_desktop = screen_last_desktop;
 617             /* save the desktop we're coming from as the "last desktop" */
 618             screen_last_desktop = previous;
 619         }
 620     }
 621     else {
 622         /* If screen_desktop_timeout is false, then we just got to this desktop
 623            and we are moving away again. */
 624
 625         if (screen_desktop == screen_last_desktop) {
 626             /* If we are moving to the "last desktop" .. */
 627             if (previous == screen_old_desktop) {
 628                 /* .. from the "old desktop", change the last desktop to
 629                    be where we are coming from */
 630                 screen_last_desktop = screen_old_desktop;
 631             }
 632             else if (screen_last_desktop == screen_old_desktop) {
 633                 /* .. and also to the "old desktop", change the "last
 634                    desktop" to be where we are coming from */
 635                 screen_last_desktop = previous;
 636             }
 637             else {
 638                 /* .. from some other desktop, then set the "last desktop" to
 639                    be the saved "old desktop", i.e. where we were before the
 640                    "last desktop" */
 641                 screen_last_desktop = screen_old_desktop;
 642             }
 643         }
 644         else {
 645             /* If we are moving to any desktop besides the "last desktop"..
 646                (this is the normal case) */
 647             if (screen_desktop == screen_old_desktop) {
 648                 /* If moving to the "old desktop", which is not the
 649                    "last desktop", don't save anything */
 650             }
 651             else if (previous == screen_old_desktop) {
 652                 /* If moving from the "old desktop", and not to the
 653                    "last desktop", don't save anything */
 654             }
 655             else if (screen_last_desktop == screen_old_desktop) {
 656                 /* If the "last desktop" is the same as "old desktop" and
 657                    you're not moving to the "last desktop" then save where
 658                    we're coming from as the "last desktop" */
 659                 screen_last_desktop = previous;
 660             }
 661             else {
 662                 /* If the "last desktop" is different from the "old desktop"
 663                    and you're not moving to the "last desktop", then don't save
 664                    anything */
 665             }
 666         }
 667     }
 668     screen_desktop_timeout = FALSE;
 669     obt_main_loop_timeout_remove(ob_main_loop, last_desktop_func);
 670     obt_main_loop_timeout_add(ob_main_loop, REMEMBER_LAST_DESKTOP_TIME,
 671                               last_desktop_func, NULL, NULL, NULL);
 672
 673     ob_debug("Moving to desktop %d", num+1);
 674
 675     /* ignore enter events caused by the move */
 676     ignore_start = event_start_ignore_all_enters();
 677
 678     if (moveresize_client)
 679         client_set_desktop(moveresize_client, num, TRUE, FALSE);
 680
 681     /* show windows before hiding the rest to lessen the enter/leave events */
 682
 683     /* show windows from top to bottom */
 684     for (it = stacking_list; it; it = g_list_next(it)) {
 685         if (WINDOW_IS_CLIENT(it->data)) {
 686             ObClient *c = it->data;
 687             client_show(c);
 688         }
 689     }
 690
 691     if (dofocus) screen_fallback_focus();
 692
 693     /* hide windows from bottom to top */
 694     for (it = g_list_last(stacking_list); it; it = g_list_previous(it)) {
 695         if (WINDOW_IS_CLIENT(it->data)) {
 696             ObClient *c = it->data;
 697             client_hide(c);
 698         }
 699     }
 700
 701     event_end_ignore_all_enters(ignore_start);
 702
 703     if (event_curtime != CurrentTime)
 704         screen_desktop_user_time = event_curtime;
 705
 706     if (ob_state() == OB_STATE_RUNNING)
 707         screen_show_desktop_popup(screen_desktop);
 708 }
 709
 710 void screen_add_desktop(gboolean current)
 711 {
 712     gulong ignore_start;
 713
 714     /* ignore enter events caused by this */
 715     ignore_start = event_start_ignore_all_enters();
 716
 717     screen_set_num_desktops(screen_num_desktops+1);
 718
 719     /* move all the clients over */
 720     if (current) {
 721         GList *it;
 722
 723         for (it = client_list; it; it = g_list_next(it)) {
 724             ObClient *c = it->data;
 725             if (c->desktop != DESKTOP_ALL && c->desktop >= screen_desktop &&
 726                 /* don't move direct children, they'll be moved with their
 727                    parent - which will have to be on the same desktop */
 728                 !client_direct_parent(c))
 729             {
 730                 ob_debug("moving window %s", c->title);
 731                 client_set_desktop(c, c->desktop+1, FALSE, TRUE);
 732             }
 733         }
 734     }
 735
 736     event_end_ignore_all_enters(ignore_start);
 737 }
 738
 739 void screen_remove_desktop(gboolean current)
 740 {
 741     guint rmdesktop, movedesktop;
 742     GList *it, *stacking_copy;
 743     gulong ignore_start;
 744
 745     if (screen_num_desktops <= 1) return;
 746
 747     /* ignore enter events caused by this */
 748     ignore_start = event_start_ignore_all_enters();
 749
 750     /* what desktop are we removing and moving to? */
 751     if (current)
 752         rmdesktop = screen_desktop;
 753     else
 754         rmdesktop = screen_num_desktops - 1;
 755     if (rmdesktop < screen_num_desktops - 1)
 756         movedesktop = rmdesktop + 1;
 757     else
 758         movedesktop = rmdesktop;
 759
 760     /* make a copy of the list cuz we're changing it */
 761     stacking_copy = g_list_copy(stacking_list);
 762     for (it = g_list_last(stacking_copy); it; it = g_list_previous(it)) {
 763         if (WINDOW_IS_CLIENT(it->data)) {
 764             ObClient *c = it->data;
 765             guint d = c->desktop;
 766             if (d != DESKTOP_ALL && d >= movedesktop &&
 767                 /* don't move direct children, they'll be moved with their
 768                    parent - which will have to be on the same desktop */
 769                 !client_direct_parent(c))
 770             {
 771                 ob_debug("moving window %s", c->title);
 772                 client_set_desktop(c, c->desktop - 1, TRUE, TRUE);
 773             }
 774             /* raise all the windows that are on the current desktop which
 775                is being merged */
 776             if ((screen_desktop == rmdesktop - 1 ||
 777                  screen_desktop == rmdesktop) &&
 778                 (d == DESKTOP_ALL || d == screen_desktop))
 779             {
 780                 stacking_raise(CLIENT_AS_WINDOW(c));
 781                 ob_debug("raising window %s", c->title);
 782             }
 783         }
 784     }
 785
 786     /* fallback focus like we're changing desktops */
 787     if (screen_desktop < screen_num_desktops - 1) {
 788         screen_fallback_focus();
 789         ob_debug("fake desktop change");
 790     }
 791
 792     screen_set_num_desktops(screen_num_desktops-1);
 793
 794     event_end_ignore_all_enters(ignore_start);
 795 }
 796
 797 static void get_row_col(guint d, guint *r, guint *c)
 798 {
 799     switch (screen_desktop_layout.orientation) {
 800     case OB_ORIENTATION_HORZ:
 801         switch (screen_desktop_layout.start_corner) {
 802         case OB_CORNER_TOPLEFT:
 803             *r = d / screen_desktop_layout.columns;
 804             *c = d % screen_desktop_layout.columns;
 805             break;
 806         case OB_CORNER_BOTTOMLEFT:
 807             *r = screen_desktop_layout.rows - 1 -
 808                 d / screen_desktop_layout.columns;
 809             *c = d % screen_desktop_layout.columns;
 810             break;
 811         case OB_CORNER_TOPRIGHT:
 812             *r = d / screen_desktop_layout.columns;
 813             *c = screen_desktop_layout.columns - 1 -
 814                 d % screen_desktop_layout.columns;
 815             break;
 816         case OB_CORNER_BOTTOMRIGHT:
 817             *r = screen_desktop_layout.rows - 1 -
 818                 d / screen_desktop_layout.columns;
 819             *c = screen_desktop_layout.columns - 1 -
 820                 d % screen_desktop_layout.columns;
 821             break;
 822         }
 823         break;
 824     case OB_ORIENTATION_VERT:
 825         switch (screen_desktop_layout.start_corner) {
 826         case OB_CORNER_TOPLEFT:
 827             *r = d % screen_desktop_layout.rows;
 828             *c = d / screen_desktop_layout.rows;
 829             break;
 830         case OB_CORNER_BOTTOMLEFT:
 831             *r = screen_desktop_layout.rows - 1 -
 832                 d % screen_desktop_layout.rows;
 833             *c = d / screen_desktop_layout.rows;
 834             break;
 835         case OB_CORNER_TOPRIGHT:
 836             *r = d % screen_desktop_layout.rows;
 837             *c = screen_desktop_layout.columns - 1 -
 838                 d / screen_desktop_layout.rows;
 839             break;
 840         case OB_CORNER_BOTTOMRIGHT:
 841             *r = screen_desktop_layout.rows - 1 -
 842                 d % screen_desktop_layout.rows;
 843             *c = screen_desktop_layout.columns - 1 -
 844                 d / screen_desktop_layout.rows;
 845             break;
 846         }
 847         break;
 848     }
 849 }
 850
 851 static guint translate_row_col(guint r, guint c)
 852 {
 853     switch (screen_desktop_layout.orientation) {
 854     case OB_ORIENTATION_HORZ:
 855         switch (screen_desktop_layout.start_corner) {
 856         case OB_CORNER_TOPLEFT:
 857             return r % screen_desktop_layout.rows *
 858                 screen_desktop_layout.columns +
 859                 c % screen_desktop_layout.columns;
 860         case OB_CORNER_BOTTOMLEFT:
 861             return (screen_desktop_layout.rows - 1 -
 862                     r % screen_desktop_layout.rows) *
 863                 screen_desktop_layout.columns +
 864                 c % screen_desktop_layout.columns;
 865         case OB_CORNER_TOPRIGHT:
 866             return r % screen_desktop_layout.rows *
 867                 screen_desktop_layout.columns +
 868                 (screen_desktop_layout.columns - 1 -
 869                  c % screen_desktop_layout.columns);
 870         case OB_CORNER_BOTTOMRIGHT:
 871             return (screen_desktop_layout.rows - 1 -
 872                     r % screen_desktop_layout.rows) *
 873                 screen_desktop_layout.columns +
 874                 (screen_desktop_layout.columns - 1 -
 875                  c % screen_desktop_layout.columns);
 876         }
 877     case OB_ORIENTATION_VERT:
 878         switch (screen_desktop_layout.start_corner) {
 879         case OB_CORNER_TOPLEFT:
 880             return c % screen_desktop_layout.columns *
 881                 screen_desktop_layout.rows +
 882                 r % screen_desktop_layout.rows;
 883         case OB_CORNER_BOTTOMLEFT:
 884             return c % screen_desktop_layout.columns *
 885                 screen_desktop_layout.rows +
 886                 (screen_desktop_layout.rows - 1 -
 887                  r % screen_desktop_layout.rows);
 888         case OB_CORNER_TOPRIGHT:
 889             return (screen_desktop_layout.columns - 1 -
 890                     c % screen_desktop_layout.columns) *
 891                 screen_desktop_layout.rows +
 892                 r % screen_desktop_layout.rows;
 893         case OB_CORNER_BOTTOMRIGHT:
 894             return (screen_desktop_layout.columns - 1 -
 895                     c % screen_desktop_layout.columns) *
 896                 screen_desktop_layout.rows +
 897                 (screen_desktop_layout.rows - 1 -
 898                  r % screen_desktop_layout.rows);
 899         }
 900     }
 901     g_assert_not_reached();
 902     return 0;
 903 }
 904
 905 static gboolean hide_desktop_popup_func(gpointer data)
 906 {
 907     pager_popup_hide(desktop_popup);
 908     return FALSE; /* don't repeat */
 909 }
 910
 911 void screen_show_desktop_popup(guint d)
 912 {
 913     Rect *a;
 914
 915     /* 0 means don't show the popup */
 916     if (!config_desktop_popup_time) return;
 917
 918     a = screen_physical_area_active();
 919     pager_popup_position(desktop_popup, CenterGravity,
 920                          a->x + a->width / 2, a->y + a->height / 2);
 921     pager_popup_icon_size_multiplier(desktop_popup,
 922                                      (screen_desktop_layout.columns /
 923                                       screen_desktop_layout.rows) / 2,
 924                                      (screen_desktop_layout.rows/
 925                                       screen_desktop_layout.columns) / 2);
 926     pager_popup_max_width(desktop_popup,
 927                           MAX(a->width/3, POPUP_WIDTH));
 928     pager_popup_show(desktop_popup, screen_desktop_names[d], d);
 929
 930     obt_main_loop_timeout_remove(ob_main_loop, hide_desktop_popup_func);
 931     obt_main_loop_timeout_add(ob_main_loop, config_desktop_popup_time * 1000,
 932                               hide_desktop_popup_func, NULL, NULL, NULL);
 933     g_free(a);
 934 }
 935
 936 void screen_hide_desktop_popup(void)
 937 {
 938     obt_main_loop_timeout_remove(ob_main_loop, hide_desktop_popup_func);
 939     pager_popup_hide(desktop_popup);
 940 }
 941
 942 guint screen_find_desktop(guint from, ObDirection dir,
 943                           gboolean wrap, gboolean linear)
 944 {
 945     guint r, c;
 946     guint d;
 947
 948     d = from;
 949     get_row_col(d, &r, &c);
 950     if (linear) {
 951         switch (dir) {
 952         case OB_DIRECTION_EAST:
 953             if (d < screen_num_desktops - 1)
 954                 ++d;
 955             else if (wrap)
 956                 d = 0;
 957             else
 958                 return from;
 959             break;
 960         case OB_DIRECTION_WEST:
 961             if (d > 0)
 962                 --d;
 963             else if (wrap)
 964                 d = screen_num_desktops - 1;
 965             else
 966                 return from;
 967             break;
 968         default:
 969             g_assert_not_reached();
 970             return from;
 971         }
 972     } else {
 973         switch (dir) {
 974         case OB_DIRECTION_EAST:
 975             ++c;
 976             if (c >= screen_desktop_layout.columns) {
 977                 if (wrap)
 978                     c = 0;
 979                 else
 980                     return from;
 981             }
 982             d = translate_row_col(r, c);
 983             if (d >= screen_num_desktops) {
 984                 if (wrap)
 985                     ++c;
 986                 else
 987                     return from;
 988             }
 989             break;
 990         case OB_DIRECTION_WEST:
 991             --c;
 992             if (c >= screen_desktop_layout.columns) {
 993                 if (wrap)
 994                     c = screen_desktop_layout.columns - 1;
 995                 else
 996                     return from;
 997             }
 998             d = translate_row_col(r, c);
 999             if (d >= screen_num_desktops) {
1000                 if (wrap)
1001                     --c;
1002                 else
1003                     return from;
1004             }
1005             break;
1006         case OB_DIRECTION_SOUTH:
1007             ++r;
1008             if (r >= screen_desktop_layout.rows) {
1009                 if (wrap)
1010                     r = 0;
1011                 else
1012                     return from;
1013             }
1014             d = translate_row_col(r, c);
1015             if (d >= screen_num_desktops) {
1016                 if (wrap)
1017                     ++r;
1018                 else
1019                     return from;
1020             }
1021             break;
1022         case OB_DIRECTION_NORTH:
1023             --r;
1024             if (r >= screen_desktop_layout.rows) {
1025                 if (wrap)
1026                     r = screen_desktop_layout.rows - 1;
1027                 else
1028                     return from;
1029             }
1030             d = translate_row_col(r, c);
1031             if (d >= screen_num_desktops) {
1032                 if (wrap)
1033                     --r;
1034                 else
1035                     return from;
1036             }
1037             break;
1038         default:
1039             g_assert_not_reached();
1040             return from;
1041         }
1042
1043         d = translate_row_col(r, c);
1044     }
1045     return d;
1046 }
1047
1048 static gboolean screen_validate_layout(ObDesktopLayout *l)
1049 {
1050     if (l->columns == 0 && l->rows == 0) /* both 0's is bad data.. */
1051         return FALSE;
1052
1053     /* fill in a zero rows/columns */
1054     if (l->columns == 0) {
1055         l->columns = screen_num_desktops / l->rows;
1056         if (l->rows * l->columns < screen_num_desktops)
1057             l->columns++;
1058         if (l->rows * l->columns >= screen_num_desktops + l->columns)
1059             l->rows--;
1060     } else if (l->rows == 0) {
1061         l->rows = screen_num_desktops / l->columns;
1062         if (l->columns * l->rows < screen_num_desktops)
1063             l->rows++;
1064         if (l->columns * l->rows >= screen_num_desktops + l->rows)
1065             l->columns--;
1066     }
1067
1068     /* bounds checking */
1069     if (l->orientation == OB_ORIENTATION_HORZ) {
1070         l->columns = MIN(screen_num_desktops, l->columns);
1071         l->rows = MIN(l->rows,
1072                       (screen_num_desktops + l->columns - 1) / l->columns);
1073         l->columns = screen_num_desktops / l->rows +
1074             !!(screen_num_desktops % l->rows);
1075     } else {
1076         l->rows = MIN(screen_num_desktops, l->rows);
1077         l->columns = MIN(l->columns,
1078                          (screen_num_desktops + l->rows - 1) / l->rows);
1079         l->rows = screen_num_desktops / l->columns +
1080             !!(screen_num_desktops % l->columns);
1081     }
1082     return TRUE;
1083 }
1084
1085 void screen_update_layout(void)
1086
1087 {
1088     ObDesktopLayout l;
1089     guint32 *data;
1090     guint num;
1091
1092     screen_desktop_layout.orientation = OB_ORIENTATION_HORZ;
1093     screen_desktop_layout.start_corner = OB_CORNER_TOPLEFT;
1094     screen_desktop_layout.rows = 1;
1095     screen_desktop_layout.columns = screen_num_desktops;
1096
1097     if (OBT_PROP_GETA32(obt_root(ob_screen),
1098                         NET_DESKTOP_LAYOUT, CARDINAL, &data, &num)) {
1099         if (num == 3 || num == 4) {
1100
1101             if (data[0] == OBT_PROP_ATOM(NET_WM_ORIENTATION_VERT))
1102                 l.orientation = OB_ORIENTATION_VERT;
1103             else if (data[0] == OBT_PROP_ATOM(NET_WM_ORIENTATION_HORZ))
1104                 l.orientation = OB_ORIENTATION_HORZ;
1105             else
1106                 return;
1107
1108             if (num < 4)
1109                 l.start_corner = OB_CORNER_TOPLEFT;
1110             else {
1111                 if (data[3] == OBT_PROP_ATOM(NET_WM_TOPLEFT))
1112                     l.start_corner = OB_CORNER_TOPLEFT;
1113                 else if (data[3] == OBT_PROP_ATOM(NET_WM_TOPRIGHT))
1114                     l.start_corner = OB_CORNER_TOPRIGHT;
1115                 else if (data[3] == OBT_PROP_ATOM(NET_WM_BOTTOMRIGHT))
1116                     l.start_corner = OB_CORNER_BOTTOMRIGHT;
1117                 else if (data[3] == OBT_PROP_ATOM(NET_WM_BOTTOMLEFT))
1118                     l.start_corner = OB_CORNER_BOTTOMLEFT;
1119                 else
1120                     return;
1121             }
1122
1123             l.columns = data[1];
1124             l.rows = data[2];
1125
1126             if (screen_validate_layout(&l))
1127                 screen_desktop_layout = l;
1128
1129             g_free(data);
1130         }
1131     }
1132 }
1133
1134 void screen_update_desktop_names(void)
1135 {
1136     guint i;
1137
1138     /* empty the array */
1139     g_strfreev(screen_desktop_names);
1140     screen_desktop_names = NULL;
1141
1142     if (OBT_PROP_GETSS(obt_root(ob_screen),
1143                        NET_DESKTOP_NAMES, utf8, &screen_desktop_names))
1144         for (i = 0; screen_desktop_names[i] && i < screen_num_desktops; ++i);
1145     else
1146         i = 0;
1147     if (i < screen_num_desktops) {
1148         GSList *it;
1149
1150         screen_desktop_names = g_renew(gchar*, screen_desktop_names,
1151                                        screen_num_desktops + 1);
1152         screen_desktop_names[screen_num_desktops] = NULL;
1153
1154         it = g_slist_nth(config_desktops_names, i);
1155
1156         for (; i < screen_num_desktops; ++i) {
1157             if (it && ((char*)it->data)[0]) /* not empty */
1158                 /* use the names from the config file when possible */
1159                 screen_desktop_names[i] = g_strdup(it->data);
1160             else
1161                 /* make up a nice name if it's not though */
1162                 screen_desktop_names[i] = g_strdup_printf(_("desktop %i"),
1163                                                           i + 1);
1164             if (it) it = g_slist_next(it);
1165         }
1166
1167         /* if we changed any names, then set the root property so we can
1168            all agree on the names */
1169         OBT_PROP_SETSS(obt_root(ob_screen), NET_DESKTOP_NAMES,
1170                        utf8, (const gchar**)screen_desktop_names);
1171     }
1172
1173     /* resize the pager for these names */
1174     pager_popup_text_width_to_strings(desktop_popup,
1175                                       screen_desktop_names,
1176                                       screen_num_desktops);
1177 }
1178
1179 void screen_show_desktop(gboolean show, ObClient *show_only)
1180 {
1181     GList *it;
1182
1183     if (show == screen_showing_desktop) return; /* no change */
1184
1185     screen_showing_desktop = show;
1186
1187     if (show) {
1188         /* hide windows bottom to top */
1189         for (it = g_list_last(stacking_list); it; it = g_list_previous(it)) {
1190             if (WINDOW_IS_CLIENT(it->data)) {
1191                 ObClient *client = it->data;
1192                 client_showhide(client);
1193             }
1194         }
1195     }
1196     else {
1197         /* restore windows top to bottom */
1198         for (it = stacking_list; it; it = g_list_next(it)) {
1199             if (WINDOW_IS_CLIENT(it->data)) {
1200                 ObClient *client = it->data;
1201                 if (client_should_show(client)) {
1202                     if (!show_only || client == show_only)
1203                         client_show(client);
1204                     else
1205                         client_iconify(client, TRUE, FALSE, TRUE);
1206                 }
1207             }
1208         }
1209     }
1210
1211     if (show) {
1212         /* focus the desktop */
1213         for (it = focus_order; it; it = g_list_next(it)) {
1214             ObClient *c = it->data;
1215             if (c->type == OB_CLIENT_TYPE_DESKTOP &&
1216                 (c->desktop == screen_desktop || c->desktop == DESKTOP_ALL) &&
1217                 client_focus(it->data))
1218                 break;
1219         }
1220     }
1221     else if (!show_only) {
1222         ObClient *c;
1223
1224         if ((c = focus_fallback(TRUE, FALSE, TRUE, FALSE))) {
1225             /* only do the flicker reducing stuff ahead of time if we are going
1226                to call xsetinputfocus on the window ourselves. otherwise there
1227                is no guarantee the window will actually take focus.. */
1228             if (c->can_focus) {
1229                 /* reduce flicker by hiliting now rather than waiting for the
1230                    server FocusIn event */
1231         render_plugin->frame_set_is_focus(c->frame, TRUE);
1232         render_plugin->frame_update_layout (c->frame, FALSE, FALSE);
1233         render_plugin->frame_update_skin (c->frame);
1234             }
1235         }
1236     }
1237
1238     show = !!show; /* make it boolean */
1239     OBT_PROP_SET32(obt_root(ob_screen), NET_SHOWING_DESKTOP, CARDINAL, show);
1240 }
1241
1242 void screen_install_colormap(ObClient *client, gboolean install)
1243 {
1244     if (client == NULL || client->colormap == None) {
1245         if (install)
1246             XInstallColormap(obt_display, RrColormap(ob_rr_inst));
1247         else
1248             XUninstallColormap(obt_display, RrColormap(ob_rr_inst));
1249     } else {
1250         obt_display_ignore_errors(TRUE);
1251         if (install)
1252             XInstallColormap(obt_display, client->colormap);
1253         else
1254             XUninstallColormap(obt_display, client->colormap);
1255         obt_display_ignore_errors(FALSE);
1256     }
1257 }
1258
1259 #define STRUT_LEFT_ON_MONITOR(s, i) \
1260     (RANGES_INTERSECT(s->left_start, s->left_end - s->left_start + 1, \
1261                       monitor_area[i].y, monitor_area[i].height))
1262 #define STRUT_RIGHT_ON_MONITOR(s, i) \
1263     (RANGES_INTERSECT(s->right_start, s->right_end - s->right_start + 1, \
1264                       monitor_area[i].y, monitor_area[i].height))
1265 #define STRUT_TOP_ON_MONITOR(s, i) \
1266     (RANGES_INTERSECT(s->top_start, s->top_end - s->top_start + 1, \
1267                       monitor_area[i].x, monitor_area[i].width))
1268 #define STRUT_BOTTOM_ON_MONITOR(s, i) \
1269     (RANGES_INTERSECT(s->bottom_start, s->bottom_end - s->bottom_start + 1, \
1270                       monitor_area[i].x, monitor_area[i].width))
1271
1272 typedef struct {
1273     guint desktop;
1274     StrutPartial *strut;
1275 } ObScreenStrut;
1276
1277 #define RESET_STRUT_LIST(sl) \
1278     (g_slist_free(sl), sl = NULL)
1279
1280 #define ADD_STRUT_TO_LIST(sl, d, s) \
1281 { \
1282     ObScreenStrut *ss = g_new(ObScreenStrut, 1); \
1283     ss->desktop = d; \
1284     ss->strut = s;  \
1285     sl = g_slist_prepend(sl, ss); \
1286 }
1287
1288 #define VALIDATE_STRUTS(sl, side, max) \
1289 { \
1290     GSList *it; \
1291     for (it = sl; it; it = g_slist_next(it)) { \
1292       ObScreenStrut *ss = it->data; \
1293       ss->strut->side = MIN(max, ss->strut->side); \
1294     } \
1295 }
1296
1297 static void get_xinerama_screens(Rect **xin_areas, guint *nxin)
1298 {
1299     guint i;
1300     gint l, r, t, b;
1301
1302     if (ob_debug_xinerama) {
1303         gint w = WidthOfScreen(ScreenOfDisplay(obt_display, ob_screen));
1304         gint h = HeightOfScreen(ScreenOfDisplay(obt_display, ob_screen));
1305         *nxin = 2;
1306         *xin_areas = g_new(Rect, *nxin + 1);
1307         RECT_SET((*xin_areas)[0], 0, 0, w/2, h);
1308         RECT_SET((*xin_areas)[1], w/2, 0, w-(w/2), h);
1309     }
1310 #ifdef XINERAMA
1311     else if (obt_display_extension_xinerama) {
1312         guint i;
1313         gint n;
1314         XineramaScreenInfo *info = XineramaQueryScreens(obt_display, &n);
1315         *nxin = n;
1316         *xin_areas = g_new(Rect, *nxin + 1);
1317         for (i = 0; i < *nxin; ++i)
1318             RECT_SET((*xin_areas)[i], info[i].x_org, info[i].y_org,
1319                      info[i].width, info[i].height);
1320         XFree(info);
1321     }
1322 #endif
1323     else {
1324         *nxin = 1;
1325         *xin_areas = g_new(Rect, *nxin + 1);
1326         RECT_SET((*xin_areas)[0], 0, 0,
1327                  WidthOfScreen(ScreenOfDisplay(obt_display, ob_screen)),
1328                  HeightOfScreen(ScreenOfDisplay(obt_display, ob_screen)));
1329     }
1330
1331     /* returns one extra with the total area in it */
1332     l = (*xin_areas)[0].x;
1333     t = (*xin_areas)[0].y;
1334     r = (*xin_areas)[0].x + (*xin_areas)[0].width - 1;
1335     b = (*xin_areas)[0].y + (*xin_areas)[0].height - 1;
1336     for (i = 1; i < *nxin; ++i) {
1337         l = MIN(l, (*xin_areas)[i].x);
1338         t = MIN(l, (*xin_areas)[i].y);
1339         r = MAX(r, (*xin_areas)[i].x + (*xin_areas)[i].width - 1);
1340         b = MAX(b, (*xin_areas)[i].y + (*xin_areas)[i].height - 1);
1341     }
1342     RECT_SET((*xin_areas)[*nxin], l, t, r - l + 1, b - t + 1);
1343 }
1344
1345 void screen_update_areas(void)
1346 {
1347     guint i, j;
1348     gulong *dims;
1349     GList *it;
1350     GSList *sit;
1351
1352     g_free(monitor_area);
1353     get_xinerama_screens(&monitor_area, &screen_num_monitors);
1354
1355     /* set up the user-specified margins */
1356     config_margins.top_start = RECT_LEFT(monitor_area[screen_num_monitors]);
1357     config_margins.top_end = RECT_RIGHT(monitor_area[screen_num_monitors]);
1358     config_margins.bottom_start = RECT_LEFT(monitor_area[screen_num_monitors]);
1359     config_margins.bottom_end = RECT_RIGHT(monitor_area[screen_num_monitors]);
1360     config_margins.left_start = RECT_TOP(monitor_area[screen_num_monitors]);
1361     config_margins.left_end = RECT_BOTTOM(monitor_area[screen_num_monitors]);
1362     config_margins.right_start = RECT_TOP(monitor_area[screen_num_monitors]);
1363     config_margins.right_end = RECT_BOTTOM(monitor_area[screen_num_monitors]);
1364
1365     dims = g_new(gulong, 4 * screen_num_desktops * screen_num_monitors);
1366
1367     RESET_STRUT_LIST(struts_left);
1368     RESET_STRUT_LIST(struts_top);
1369     RESET_STRUT_LIST(struts_right);
1370     RESET_STRUT_LIST(struts_bottom);
1371
1372     /* collect the struts */
1373     for (it = client_list; it; it = g_list_next(it)) {
1374         ObClient *c = it->data;
1375         if (c->strut.left)
1376             ADD_STRUT_TO_LIST(struts_left, c->desktop, &c->strut);
1377         if (c->strut.top)
1378             ADD_STRUT_TO_LIST(struts_top, c->desktop, &c->strut);
1379         if (c->strut.right)
1380             ADD_STRUT_TO_LIST(struts_right, c->desktop, &c->strut);
1381         if (c->strut.bottom)
1382             ADD_STRUT_TO_LIST(struts_bottom, c->desktop, &c->strut);
1383     }
1384     if (dock_strut.left)
1385         ADD_STRUT_TO_LIST(struts_left, DESKTOP_ALL, &dock_strut);
1386     if (dock_strut.top)
1387         ADD_STRUT_TO_LIST(struts_top, DESKTOP_ALL, &dock_strut);
1388     if (dock_strut.right)
1389         ADD_STRUT_TO_LIST(struts_right, DESKTOP_ALL, &dock_strut);
1390     if (dock_strut.bottom)
1391         ADD_STRUT_TO_LIST(struts_bottom, DESKTOP_ALL, &dock_strut);
1392
1393     if (config_margins.left)
1394         ADD_STRUT_TO_LIST(struts_left, DESKTOP_ALL, &config_margins);
1395     if (config_margins.top)
1396         ADD_STRUT_TO_LIST(struts_top, DESKTOP_ALL, &config_margins);
1397     if (config_margins.right)
1398         ADD_STRUT_TO_LIST(struts_right, DESKTOP_ALL, &config_margins);
1399     if (config_margins.bottom)
1400         ADD_STRUT_TO_LIST(struts_bottom, DESKTOP_ALL, &config_margins);
1401
1402     VALIDATE_STRUTS(struts_left, left,
1403                     monitor_area[screen_num_monitors].width / 2);
1404     VALIDATE_STRUTS(struts_right, right,
1405                     monitor_area[screen_num_monitors].width / 2);
1406     VALIDATE_STRUTS(struts_top, top,
1407                     monitor_area[screen_num_monitors].height / 2);
1408     VALIDATE_STRUTS(struts_bottom, bottom,
1409                     monitor_area[screen_num_monitors].height / 2);
1410
1411     /* set up the work areas to be full screen */
1412     for (i = 0; i < screen_num_monitors; ++i)
1413         for (j = 0; j < screen_num_desktops; ++j) {
1414             dims[(i * screen_num_desktops + j) * 4+0] = monitor_area[i].x;
1415             dims[(i * screen_num_desktops + j) * 4+1] = monitor_area[i].y;
1416             dims[(i * screen_num_desktops + j) * 4+2] = monitor_area[i].width;
1417             dims[(i * screen_num_desktops + j) * 4+3] = monitor_area[i].height;
1418         }
1419
1420     /* calculate the work areas from the struts */
1421     for (i = 0; i < screen_num_monitors; ++i)
1422         for (j = 0; j < screen_num_desktops; ++j) {
1423             gint l = 0, r = 0, t = 0, b = 0;
1424
1425             /* only add the strut to the area if it touches the monitor */
1426
1427             for (sit = struts_left; sit; sit = g_slist_next(sit)) {
1428                 ObScreenStrut *s = sit->data;
1429                 if ((s->desktop == j || s->desktop == DESKTOP_ALL) &&
1430                     STRUT_LEFT_ON_MONITOR(s->strut, i))
1431                     l = MAX(l, s->strut->left);
1432             }
1433             for (sit = struts_top; sit; sit = g_slist_next(sit)) {
1434                 ObScreenStrut *s = sit->data;
1435                 if ((s->desktop == j || s->desktop == DESKTOP_ALL) &&
1436                     STRUT_TOP_ON_MONITOR(s->strut, i))
1437                     t = MAX(t, s->strut->top);
1438             }
1439             for (sit = struts_right; sit; sit = g_slist_next(sit)) {
1440                 ObScreenStrut *s = sit->data;
1441                 if ((s->desktop == j || s->desktop == DESKTOP_ALL) &&
1442                     STRUT_RIGHT_ON_MONITOR(s->strut, i))
1443                     r = MAX(r, s->strut->right);
1444             }
1445             for (sit = struts_bottom; sit; sit = g_slist_next(sit)) {
1446                 ObScreenStrut *s = sit->data;
1447                 if ((s->desktop == j || s->desktop == DESKTOP_ALL) &&
1448                     STRUT_BOTTOM_ON_MONITOR(s->strut, i))
1449                     b = MAX(b, s->strut->bottom);
1450             }
1451
1452             /* based on these margins, set the work area for the
1453                monitor/desktop */
1454             dims[(i * screen_num_desktops + j) * 4 + 0] += l;
1455             dims[(i * screen_num_desktops + j) * 4 + 1] += t;
1456             dims[(i * screen_num_desktops + j) * 4 + 2] -= l + r;
1457             dims[(i * screen_num_desktops + j) * 4 + 3] -= t + b;
1458         }
1459
1460     /* all the work areas are not used here, only the ones for the first
1461        monitor are */
1462     OBT_PROP_SETA32(obt_root(ob_screen), NET_WORKAREA, CARDINAL,
1463                     dims, 4 * screen_num_desktops);
1464
1465     /* the area has changed, adjust all the windows if they need it */
1466     for (it = client_list; it; it = g_list_next(it))
1467         client_reconfigure(it->data, FALSE);
1468
1469     g_free(dims);
1470 }
1471
1472 #if 0
1473 Rect* screen_area_all_monitors(guint desktop)
1474 {
1475     guint i;
1476     Rect *a;
1477
1478     a = screen_area_monitor(desktop, 0);
1479
1480     /* combine all the monitors together */
1481     for (i = 1; i < screen_num_monitors; ++i) {
1482         Rect *m = screen_area_monitor(desktop, i);
1483         gint l, r, t, b;
1484
1485         l = MIN(RECT_LEFT(*a), RECT_LEFT(*m));
1486         t = MIN(RECT_TOP(*a), RECT_TOP(*m));
1487         r = MAX(RECT_RIGHT(*a), RECT_RIGHT(*m));
1488         b = MAX(RECT_BOTTOM(*a), RECT_BOTTOM(*m));
1489
1490         RECT_SET(*a, l, t, r - l + 1, b - t + 1);
1491
1492         g_free(m);
1493     }
1494
1495     return a;
1496 }
1497 #endif
1498
1499 #define STRUT_LEFT_IN_SEARCH(s, search) \
1500     (RANGES_INTERSECT(search->y, search->height, \
1501                       s->left_start, s->left_end - s->left_start + 1))
1502 #define STRUT_RIGHT_IN_SEARCH(s, search) \
1503     (RANGES_INTERSECT(search->y, search->height, \
1504                       s->right_start, s->right_end - s->right_start + 1))
1505 #define STRUT_TOP_IN_SEARCH(s, search) \
1506     (RANGES_INTERSECT(search->x, search->width, \
1507                       s->top_start, s->top_end - s->top_start + 1))
1508 #define STRUT_BOTTOM_IN_SEARCH(s, search) \
1509     (RANGES_INTERSECT(search->x, search->width, \
1510                       s->bottom_start, s->bottom_end - s->bottom_start + 1))
1511
1512 #define STRUT_LEFT_IGNORE(s, us, search) \
1513     (head == SCREEN_AREA_ALL_MONITORS && us && \
1514      RECT_LEFT(monitor_area[i]) + s->left > RECT_LEFT(*search))
1515 #define STRUT_RIGHT_IGNORE(s, us, search) \
1516     (head == SCREEN_AREA_ALL_MONITORS && us && \
1517      RECT_RIGHT(monitor_area[i]) - s->right < RECT_RIGHT(*search))
1518 #define STRUT_TOP_IGNORE(s, us, search) \
1519     (head == SCREEN_AREA_ALL_MONITORS && us && \
1520      RECT_TOP(monitor_area[i]) + s->top > RECT_TOP(*search))
1521 #define STRUT_BOTTOM_IGNORE(s, us, search) \
1522     (head == SCREEN_AREA_ALL_MONITORS && us && \
1523      RECT_BOTTOM(monitor_area[i]) - s->bottom < RECT_BOTTOM(*search))
1524
1525 Rect* screen_area(guint desktop, guint head, Rect *search)
1526 {
1527     Rect *a;
1528     GSList *it;
1529     gint l, r, t, b, al, ar, at, ab;
1530     guint i, d;
1531     gboolean us = search != NULL; /* user provided search */
1532
1533     g_assert(desktop < screen_num_desktops || desktop == DESKTOP_ALL);
1534     g_assert(head < screen_num_monitors || head == SCREEN_AREA_ONE_MONITOR ||
1535              head == SCREEN_AREA_ALL_MONITORS);
1536     g_assert(!(head == SCREEN_AREA_ONE_MONITOR && search == NULL));
1537
1538     /* find any struts for this monitor
1539        which will be affecting the search area.
1540     */
1541
1542     /* search everything if search is null */
1543     if (!search) {
1544         if (head < screen_num_monitors) search = &monitor_area[head];
1545         else search = &monitor_area[screen_num_monitors];
1546     }
1547     if (head == SCREEN_AREA_ONE_MONITOR) head = screen_find_monitor(search);
1548
1549     /* al is "all left" meaning the furthest left you can get, l is our
1550        "working left" meaning our current strut edge which we're calculating
1551     */
1552
1553     /* only include monitors which the search area lines up with */
1554     if (RECT_INTERSECTS_RECT(monitor_area[screen_num_monitors], *search)) {
1555         al = l = RECT_RIGHT(monitor_area[screen_num_monitors]);
1556         at = t = RECT_BOTTOM(monitor_area[screen_num_monitors]);
1557         ar = r = RECT_LEFT(monitor_area[screen_num_monitors]);
1558         ab = b = RECT_TOP(monitor_area[screen_num_monitors]);
1559         for (i = 0; i < screen_num_monitors; ++i) {
1560             /* add the monitor if applicable */
1561             if (RANGES_INTERSECT(search->x, search->width,
1562                                  monitor_area[i].x, monitor_area[i].width))
1563             {
1564                 at = t = MIN(t, RECT_TOP(monitor_area[i]));
1565                 ab = b = MAX(b, RECT_BOTTOM(monitor_area[i]));
1566             }
1567             if (RANGES_INTERSECT(search->y, search->height,
1568                                  monitor_area[i].y, monitor_area[i].height))
1569             {
1570                 al = l = MIN(l, RECT_LEFT(monitor_area[i]));
1571                 ar = r = MAX(r, RECT_RIGHT(monitor_area[i]));
1572             }
1573         }
1574     } else {
1575         al = l = RECT_LEFT(monitor_area[screen_num_monitors]);
1576         at = t = RECT_TOP(monitor_area[screen_num_monitors]);
1577         ar = r = RECT_RIGHT(monitor_area[screen_num_monitors]);
1578         ab = b = RECT_BOTTOM(monitor_area[screen_num_monitors]);
1579     }
1580
1581     for (d = 0; d < screen_num_desktops; ++d) {
1582         if (d != desktop && desktop != DESKTOP_ALL) continue;
1583
1584         for (i = 0; i < screen_num_monitors; ++i) {
1585             if (head != SCREEN_AREA_ALL_MONITORS && head != i) continue;
1586
1587             for (it = struts_left; it; it = g_slist_next(it)) {
1588                 ObScreenStrut *s = it->data;
1589                 if ((s->desktop == d || s->desktop == DESKTOP_ALL) &&
1590                     STRUT_LEFT_IN_SEARCH(s->strut, search) &&
1591                     !STRUT_LEFT_IGNORE(s->strut, us, search))
1592                     l = MAX(l, al + s->strut->left);
1593             }
1594             for (it = struts_top; it; it = g_slist_next(it)) {
1595                 ObScreenStrut *s = it->data;
1596                 if ((s->desktop == d || s->desktop == DESKTOP_ALL) &&
1597                     STRUT_TOP_IN_SEARCH(s->strut, search) &&
1598                     !STRUT_TOP_IGNORE(s->strut, us, search))
1599                     t = MAX(t, at + s->strut->top);
1600             }
1601             for (it = struts_right; it; it = g_slist_next(it)) {
1602                 ObScreenStrut *s = it->data;
1603                 if ((s->desktop == d || s->desktop == DESKTOP_ALL) &&
1604                     STRUT_RIGHT_IN_SEARCH(s->strut, search) &&
1605                     !STRUT_RIGHT_IGNORE(s->strut, us, search))
1606                     r = MIN(r, ar - s->strut->right);
1607             }
1608             for (it = struts_bottom; it; it = g_slist_next(it)) {
1609                 ObScreenStrut *s = it->data;
1610                 if ((s->desktop == d || s->desktop == DESKTOP_ALL) &&
1611                     STRUT_BOTTOM_IN_SEARCH(s->strut, search) &&
1612                     !STRUT_BOTTOM_IGNORE(s->strut, us, search))
1613                     b = MIN(b, ab - s->strut->bottom);
1614             }
1615
1616             /* limit to this monitor */
1617             if (head == i) {
1618                 l = MAX(l, RECT_LEFT(monitor_area[i]));
1619                 t = MAX(t, RECT_TOP(monitor_area[i]));
1620                 r = MIN(r, RECT_RIGHT(monitor_area[i]));
1621                 b = MIN(b, RECT_BOTTOM(monitor_area[i]));
1622             }
1623         }
1624     }
1625
1626     a = g_new(Rect, 1);
1627     a->x = l;
1628     a->y = t;
1629     a->width = r - l + 1;
1630     a->height = b - t + 1;
1631     return a;
1632 }
1633
1634 guint screen_find_monitor(Rect *search)
1635 {
1636     guint i;
1637     guint most = screen_num_monitors;
1638     guint mostv = 0;
1639
1640     for (i = 0; i < screen_num_monitors; ++i) {
1641         Rect *area = screen_physical_area_monitor(i);
1642         if (RECT_INTERSECTS_RECT(*area, *search)) {
1643             Rect r;
1644             guint v;
1645
1646             RECT_SET_INTERSECTION(r, *area, *search);
1647             v = r.width * r.height;
1648
1649             if (v > mostv) {
1650                 mostv = v;
1651                 most = i;
1652             }
1653         }
1654         g_free(area);
1655     }
1656     return most;
1657 }
1658
1659 Rect* screen_physical_area_all_monitors(void)
1660 {
1661     return screen_physical_area_monitor(screen_num_monitors);
1662 }
1663
1664 Rect* screen_physical_area_monitor(guint head)
1665 {
1666     Rect *a;
1667     g_assert(head <= screen_num_monitors);
1668
1669     a = g_new(Rect, 1);
1670     *a = monitor_area[head];
1671     return a;
1672 }
1673
1674 gboolean screen_physical_area_monitor_contains(guint head, Rect *search)
1675 {
1676     g_assert(head <= screen_num_monitors);
1677     g_assert(search);
1678     return RECT_INTERSECTS_RECT(monitor_area[head], *search);
1679 }
1680
1681 Rect* screen_physical_area_active(void)
1682 {
1683     Rect *a;
1684     gint x, y;
1685
1686     if (moveresize_client)
1687         a = screen_physical_area_monitor(client_monitor(focus_client));
1688     else if (focus_client)
1689         a = screen_physical_area_monitor(client_monitor(focus_client));
1690     else {
1691         Rect mon;
1692         if (screen_pointer_pos(&x, &y))
1693             RECT_SET(mon, x, y, 1, 1);
1694         else
1695             RECT_SET(mon, 0, 0, 1, 1);
1696         a = screen_physical_area_monitor(screen_find_monitor(&mon));
1697     }
1698     return a;
1699 }
1700
1701 void screen_set_root_cursor(void)
1702 {
1703     if (sn_app_starting())
1704         XDefineCursor(obt_display, obt_root(ob_screen),
1705                       ob_cursor(OB_CURSOR_BUSYPOINTER));
1706     else
1707         XDefineCursor(obt_display, obt_root(ob_screen),
1708                       ob_cursor(OB_CURSOR_POINTER));
1709 }
1710
1711 gboolean screen_pointer_pos(gint *x, gint *y)
1712 {
1713     Window w;
1714     gint i;
1715     guint u;
1716     gboolean ret;
1717
1718     ret = !!XQueryPointer(obt_display, obt_root(ob_screen),
1719                           &w, &w, x, y, &i, &i, &u);
1720     if (!ret) {
1721         for (i = 0; i < ScreenCount(obt_display); ++i)
1722             if (i != ob_screen)
1723                 if (XQueryPointer(obt_display, obt_root(i),
1724                                   &w, &w, x, y, &i, &i, &u))
1725                     break;
1726     }
1727     return ret;
1728 }