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 "frame.h"
  31 #include "event.h"
  32 #include "focus.h"
  33 #include "focus_cycle.h"
  34 #include "popup.h"
  35 #include "version.h"
  36 #include "obrender/render.h"
  37 #include "gettext.h"
  38 #include "obt/display.h"
  39 #include "obt/xqueue.h"
  40 #include "obt/prop.h"
  41
  42 #include <X11/Xlib.h>
  43 #ifdef HAVE_UNISTD_H
  44 #  include <sys/types.h>
  45 #  include <unistd.h>
  46 #endif
  47 #include <assert.h>
  48
  49 /*! The event mask to grab on the root window */
  50 #define ROOT_EVENTMASK (StructureNotifyMask | PropertyChangeMask | \
  51                         EnterWindowMask | LeaveWindowMask | \
  52                         SubstructureRedirectMask | FocusChangeMask | \
  53                         ButtonPressMask | ButtonReleaseMask)
  54
  55 static gboolean screen_validate_layout(ObDesktopLayout *l);
  56 static gboolean replace_wm(void);
  57 static void     screen_tell_ksplash(void);
  58 static void     screen_fallback_focus(void);
  59
  60 guint           screen_num_desktops;
  61 guint           screen_num_monitors;
  62 guint           screen_desktop;
  63 guint           screen_last_desktop;
  64 gboolean        screen_showing_desktop;
  65 ObDesktopLayout screen_desktop_layout;
  66 gchar         **screen_desktop_names;
  67 Window          screen_support_win;
  68 Time            screen_desktop_user_time = CurrentTime;
  69
  70 static Size     screen_physical_size;
  71 static guint    screen_old_desktop;
  72 static gboolean screen_desktop_timeout = TRUE;
  73 static guint    screen_desktop_timer = 0;
  74 /*! An array of desktops, holding an array of areas per monitor */
  75 static Rect  *monitor_area = NULL;
  76 /*! An array of desktops, holding an array of struts */
  77 static GSList *struts_top = NULL;
  78 static GSList *struts_left = NULL;
  79 static GSList *struts_right = NULL;
  80 static GSList *struts_bottom = NULL;
  81
  82 static ObPagerPopup *desktop_popup;
  83 static guint         desktop_popup_timer = 0;
  84 static gboolean      desktop_popup_perm;
  85
  86 /*! The number of microseconds that you need to be on a desktop before it will
  87   replace the remembered "last desktop" */
  88 #define REMEMBER_LAST_DESKTOP_TIME 750
  89
  90 static gboolean replace_wm(void)
  91 {
  92     gchar *wm_sn;
  93     Atom wm_sn_atom;
  94     Window current_wm_sn_owner;
  95     Time timestamp;
  96
  97     wm_sn = g_strdup_printf("WM_S%d", ob_screen);
  98     wm_sn_atom = XInternAtom(obt_display, wm_sn, FALSE);
  99     g_free(wm_sn);
 100
 101     current_wm_sn_owner = XGetSelectionOwner(obt_display, wm_sn_atom);
 102     if (current_wm_sn_owner == screen_support_win)
 103         current_wm_sn_owner = None;
 104     if (current_wm_sn_owner) {
 105         if (!ob_replace_wm) {
 106             g_message(_("A window manager is already running on screen %d"),
 107                       ob_screen);
 108             return FALSE;
 109         }
 110         obt_display_ignore_errors(TRUE);
 111
 112         /* We want to find out when the current selection owner dies */
 113         XSelectInput(obt_display, current_wm_sn_owner, StructureNotifyMask);
 114         XSync(obt_display, FALSE);
 115
 116         obt_display_ignore_errors(FALSE);
 117         if (obt_display_error_occured)
 118             current_wm_sn_owner = None;
 119     }
 120
 121     timestamp = event_time();
 122
 123     XSetSelectionOwner(obt_display, wm_sn_atom, screen_support_win,
 124                        timestamp);
 125
 126     if (XGetSelectionOwner(obt_display, wm_sn_atom) != screen_support_win) {
 127         g_message(_("Could not acquire window manager selection on screen %d"),
 128                   ob_screen);
 129         return FALSE;
 130     }
 131
 132     /* Wait for old window manager to go away */
 133     if (current_wm_sn_owner) {
 134       gulong wait = 0;
 135       const gulong timeout = G_USEC_PER_SEC * 15; /* wait for 15s max */
 136       ObtXQueueWindowType wt;
 137
 138       wt.window = current_wm_sn_owner;
 139       wt.type = DestroyNotify;
 140
 141       while (wait < timeout) {
 142           /* Checks the local queue and incoming events for this event */
 143           if (xqueue_exists_local(xqueue_match_window_type, &wt))
 144               break;
 145           g_usleep(G_USEC_PER_SEC / 10);
 146           wait += G_USEC_PER_SEC / 10;
 147       }
 148
 149       if (wait >= timeout) {
 150           g_message(_("The WM on screen %d is not exiting"), ob_screen);
 151           return FALSE;
 152       }
 153     }
 154
 155     /* Send client message indicating that we are now the WM */
 156     obt_prop_message(ob_screen, obt_root(ob_screen), OBT_PROP_ATOM(MANAGER),
 157                      timestamp, wm_sn_atom, screen_support_win, 0, 0,
 158                      SubstructureNotifyMask);
 159
 160     return TRUE;
 161 }
 162
 163 gboolean screen_annex(void)
 164 {
 165     XSetWindowAttributes attrib;
 166     pid_t pid;
 167     gint i, num_support;
 168     gulong *supported;
 169
 170     /* create the netwm support window */
 171     attrib.override_redirect = TRUE;
 172     attrib.event_mask = PropertyChangeMask;
 173     screen_support_win = XCreateWindow(obt_display, obt_root(ob_screen),
 174                                        -100, -100, 1, 1, 0,
 175                                        CopyFromParent, InputOutput,
 176                                        CopyFromParent,
 177                                        CWEventMask | CWOverrideRedirect,
 178                                        &attrib);
 179     XMapWindow(obt_display, screen_support_win);
 180     XLowerWindow(obt_display, screen_support_win);
 181
 182     if (!replace_wm()) {
 183         XDestroyWindow(obt_display, screen_support_win);
 184         return FALSE;
 185     }
 186
 187     obt_display_ignore_errors(TRUE);
 188     XSelectInput(obt_display, obt_root(ob_screen), ROOT_EVENTMASK);
 189     obt_display_ignore_errors(FALSE);
 190     if (obt_display_error_occured) {
 191         g_message(_("A window manager is already running on screen %d"),
 192                   ob_screen);
 193
 194         XDestroyWindow(obt_display, screen_support_win);
 195         return FALSE;
 196     }
 197
 198     screen_set_root_cursor();
 199
 200     /* set the OPENBOX_PID hint */
 201     pid = getpid();
 202     OBT_PROP_SET32(obt_root(ob_screen), OPENBOX_PID, CARDINAL, pid);
 203
 204     /* set supporting window */
 205     OBT_PROP_SET32(obt_root(ob_screen),
 206                    NET_SUPPORTING_WM_CHECK, WINDOW, screen_support_win);
 207
 208     /* set properties on the supporting window */
 209     OBT_PROP_SETS(screen_support_win, NET_WM_NAME, "Openbox");
 210     OBT_PROP_SET32(screen_support_win, NET_SUPPORTING_WM_CHECK,
 211                    WINDOW, screen_support_win);
 212
 213     /* set the _NET_SUPPORTED_ATOMS hint */
 214
 215     /* this is all the atoms after NET_SUPPORTED in the ObtPropAtoms enum */
 216     num_support = OBT_PROP_NUM_ATOMS - OBT_PROP_NET_SUPPORTED - 1;
 217     i = 0;
 218     supported = g_new(gulong, num_support);
 219     supported[i++] = OBT_PROP_ATOM(NET_SUPPORTING_WM_CHECK);
 220     supported[i++] = OBT_PROP_ATOM(NET_WM_FULL_PLACEMENT);
 221     supported[i++] = OBT_PROP_ATOM(NET_CURRENT_DESKTOP);
 222     supported[i++] = OBT_PROP_ATOM(NET_NUMBER_OF_DESKTOPS);
 223     supported[i++] = OBT_PROP_ATOM(NET_DESKTOP_GEOMETRY);
 224     supported[i++] = OBT_PROP_ATOM(NET_DESKTOP_VIEWPORT);
 225     supported[i++] = OBT_PROP_ATOM(NET_ACTIVE_WINDOW);
 226     supported[i++] = OBT_PROP_ATOM(NET_WORKAREA);
 227     supported[i++] = OBT_PROP_ATOM(NET_CLIENT_LIST);
 228     supported[i++] = OBT_PROP_ATOM(NET_CLIENT_LIST_STACKING);
 229     supported[i++] = OBT_PROP_ATOM(NET_DESKTOP_NAMES);
 230     supported[i++] = OBT_PROP_ATOM(NET_CLOSE_WINDOW);
 231     supported[i++] = OBT_PROP_ATOM(NET_DESKTOP_LAYOUT);
 232     supported[i++] = OBT_PROP_ATOM(NET_SHOWING_DESKTOP);
 233     supported[i++] = OBT_PROP_ATOM(NET_WM_NAME);
 234     supported[i++] = OBT_PROP_ATOM(NET_WM_VISIBLE_NAME);
 235     supported[i++] = OBT_PROP_ATOM(NET_WM_ICON_NAME);
 236     supported[i++] = OBT_PROP_ATOM(NET_WM_VISIBLE_ICON_NAME);
 237     supported[i++] = OBT_PROP_ATOM(NET_WM_DESKTOP);
 238     supported[i++] = OBT_PROP_ATOM(NET_WM_STRUT);
 239     supported[i++] = OBT_PROP_ATOM(NET_WM_STRUT_PARTIAL);
 240     supported[i++] = OBT_PROP_ATOM(NET_WM_ICON);
 241     supported[i++] = OBT_PROP_ATOM(NET_WM_ICON_GEOMETRY);
 242     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE);
 243     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE_DESKTOP);
 244     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE_DOCK);
 245     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE_TOOLBAR);
 246     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE_MENU);
 247     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE_UTILITY);
 248     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE_SPLASH);
 249     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE_DIALOG);
 250     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_TYPE_NORMAL);
 251     supported[i++] = OBT_PROP_ATOM(NET_WM_ALLOWED_ACTIONS);
 252     supported[i++] = OBT_PROP_ATOM(NET_WM_WINDOW_OPACITY);
 253     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_MOVE);
 254     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_RESIZE);
 255     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_MINIMIZE);
 256     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_SHADE);
 257     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_MAXIMIZE_HORZ);
 258     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_MAXIMIZE_VERT);
 259     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_FULLSCREEN);
 260     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_CHANGE_DESKTOP);
 261     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_CLOSE);
 262     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_ABOVE);
 263     supported[i++] = OBT_PROP_ATOM(NET_WM_ACTION_BELOW);
 264     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE);
 265     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_MODAL);
 266     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_MAXIMIZED_VERT);
 267     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_MAXIMIZED_HORZ);
 268     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_SHADED);
 269     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_SKIP_TASKBAR);
 270     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_SKIP_PAGER);
 271     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_HIDDEN);
 272     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_FULLSCREEN);
 273     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_ABOVE);
 274     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_BELOW);
 275     supported[i++] = OBT_PROP_ATOM(NET_WM_STATE_DEMANDS_ATTENTION);
 276     supported[i++] = OBT_PROP_ATOM(NET_MOVERESIZE_WINDOW);
 277     supported[i++] = OBT_PROP_ATOM(NET_WM_MOVERESIZE);
 278     supported[i++] = OBT_PROP_ATOM(NET_WM_USER_TIME);
 279 /*
 280     supported[i++] = OBT_PROP_ATOM(NET_WM_USER_TIME_WINDOW);
 281 */
 282     supported[i++] = OBT_PROP_ATOM(NET_FRAME_EXTENTS);
 283     supported[i++] = OBT_PROP_ATOM(NET_REQUEST_FRAME_EXTENTS);
 284     supported[i++] = OBT_PROP_ATOM(NET_RESTACK_WINDOW);
 285     supported[i++] = OBT_PROP_ATOM(NET_STARTUP_ID);
 286 #ifdef SYNC
 287     supported[i++] = OBT_PROP_ATOM(NET_WM_SYNC_REQUEST);
 288     supported[i++] = OBT_PROP_ATOM(NET_WM_SYNC_REQUEST_COUNTER);
 289 #endif
 290     supported[i++] = OBT_PROP_ATOM(NET_WM_PID);
 291     supported[i++] = OBT_PROP_ATOM(NET_WM_PING);
 292
 293     supported[i++] = OBT_PROP_ATOM(KDE_WM_CHANGE_STATE);
 294     supported[i++] = OBT_PROP_ATOM(KDE_NET_WM_FRAME_STRUT);
 295     supported[i++] = OBT_PROP_ATOM(KDE_NET_WM_WINDOW_TYPE_OVERRIDE);
 296
 297     supported[i++] = OBT_PROP_ATOM(OB_WM_ACTION_UNDECORATE);
 298     supported[i++] = OBT_PROP_ATOM(OB_WM_STATE_UNDECORATED);
 299     supported[i++] = OBT_PROP_ATOM(OPENBOX_PID);
 300     supported[i++] = OBT_PROP_ATOM(OB_THEME);
 301     supported[i++] = OBT_PROP_ATOM(OB_CONFIG_FILE);
 302     supported[i++] = OBT_PROP_ATOM(OB_CONTROL);
 303     supported[i++] = OBT_PROP_ATOM(OB_VERSION);
 304     supported[i++] = OBT_PROP_ATOM(OB_APP_ROLE);
 305     supported[i++] = OBT_PROP_ATOM(OB_APP_TITLE);
 306     supported[i++] = OBT_PROP_ATOM(OB_APP_NAME);
 307     supported[i++] = OBT_PROP_ATOM(OB_APP_CLASS);
 308     supported[i++] = OBT_PROP_ATOM(OB_APP_GROUP_NAME);
 309     supported[i++] = OBT_PROP_ATOM(OB_APP_GROUP_CLASS);
 310     supported[i++] = OBT_PROP_ATOM(OB_APP_TYPE);
 311     g_assert(i == num_support);
 312
 313     OBT_PROP_SETA32(obt_root(ob_screen),
 314                     NET_SUPPORTED, ATOM, supported, num_support);
 315     g_free(supported);
 316
 317     OBT_PROP_SETS(RootWindow(obt_display, ob_screen), OB_VERSION,
 318                   OPENBOX_VERSION);
 319
 320     screen_tell_ksplash();
 321
 322     return TRUE;
 323 }
 324
 325 static void screen_tell_ksplash(void)
 326 {
 327     XEvent e;
 328     char **argv;
 329
 330     argv = g_new(gchar*, 6);
 331     argv[0] = g_strdup("dcop");
 332     argv[1] = g_strdup("ksplash");
 333     argv[2] = g_strdup("ksplash");
 334     argv[3] = g_strdup("upAndRunning(QString)");
 335     argv[4] = g_strdup("wm started");
 336     argv[5] = NULL;
 337
 338     /* tell ksplash through the dcop server command line interface */
 339     g_spawn_async(NULL, argv, NULL,
 340                   G_SPAWN_SEARCH_PATH | G_SPAWN_DO_NOT_REAP_CHILD |
 341                   G_SPAWN_STDERR_TO_DEV_NULL | G_SPAWN_STDOUT_TO_DEV_NULL,
 342                   NULL, NULL, NULL, NULL);
 343     g_strfreev(argv);
 344
 345     /* i'm not sure why we do this, kwin does it, but ksplash doesn't seem to
 346        hear it anyways. perhaps it is for old ksplash. or new ksplash. or
 347        something. oh well. */
 348     e.xclient.type = ClientMessage;
 349     e.xclient.display = obt_display;
 350     e.xclient.window = obt_root(ob_screen);
 351     e.xclient.message_type =
 352         XInternAtom(obt_display, "_KDE_SPLASH_PROGRESS", False);
 353     e.xclient.format = 8;
 354     strcpy(e.xclient.data.b, "wm started");
 355     XSendEvent(obt_display, obt_root(ob_screen),
 356                False, SubstructureNotifyMask, &e);
 357 }
 358
 359 void screen_startup(gboolean reconfig)
 360 {
 361     gchar **names = NULL;
 362     guint32 d;
 363     gboolean namesexist = FALSE;
 364
 365     desktop_popup = pager_popup_new();
 366     desktop_popup_perm = FALSE;
 367     pager_popup_height(desktop_popup, POPUP_HEIGHT);
 368
 369     if (reconfig) {
 370         /* update the pager popup's width */
 371         pager_popup_text_width_to_strings(desktop_popup,
 372                                           screen_desktop_names,
 373                                           screen_num_desktops);
 374         return;
 375     }
 376
 377     /* get the initial size */
 378     screen_resize();
 379
 380     /* have names already been set for the desktops? */
 381     if (OBT_PROP_GETSS_UTF8(obt_root(ob_screen), NET_DESKTOP_NAMES, &names)) {
 382         g_strfreev(names);
 383         namesexist = TRUE;
 384     }
 385
 386     /* if names don't exist and we have session names, set those.
 387        do this stuff BEFORE setting the number of desktops, because that
 388        will create default names for them
 389     */
 390     if (!namesexist && session_desktop_names != NULL) {
 391         guint i, numnames;
 392         GSList *it;
 393
 394         /* get the desktop names */
 395         numnames = g_slist_length(session_desktop_names);
 396         names = g_new(gchar*, numnames + 1);
 397         names[numnames] = NULL;
 398         for (i = 0, it = session_desktop_names; it; ++i, it = g_slist_next(it))
 399             names[i] = g_strdup(it->data);
 400
 401         /* set the root window property */
 402         OBT_PROP_SETSS(obt_root(ob_screen),
 403                        NET_DESKTOP_NAMES, (const gchar*const*)names);
 404
 405         g_strfreev(names);
 406     }
 407
 408     /* set the number of desktops, if it's not already set.
 409
 410        this will also set the default names from the config file up for
 411        desktops that don't have names yet */
 412     screen_num_desktops = 0;
 413     if (OBT_PROP_GET32(obt_root(ob_screen),
 414                        NET_NUMBER_OF_DESKTOPS, CARDINAL, &d))
 415     {
 416         if (d != config_desktops_num) {
 417             /* TRANSLATORS: If you need to specify a different order of the
 418                arguments, you can use %1$d for the first one and %2$d for the
 419                second one. For example,
 420                "The current session has %2$d desktops, but Openbox is configured for %1$d ..." */
 421             g_warning(ngettext("Openbox is configured for %d desktop, but the current session has %d.  Overriding the Openbox configuration.", "Openbox is configured for %d desktops, but the current session has %d.  Overriding the Openbox configuration.", config_desktops_num),
 422                       config_desktops_num, d);
 423         }
 424         screen_set_num_desktops(d);
 425     }
 426     /* restore from session if possible */
 427     else if (session_num_desktops)
 428         screen_set_num_desktops(session_num_desktops);
 429     else
 430         screen_set_num_desktops(config_desktops_num);
 431
 432     screen_desktop = screen_num_desktops;  /* something invalid */
 433     /* start on the current desktop when a wm was already running */
 434     if (OBT_PROP_GET32(obt_root(ob_screen),
 435                        NET_CURRENT_DESKTOP, CARDINAL, &d) &&
 436         d < screen_num_desktops)
 437     {
 438         screen_set_desktop(d, FALSE);
 439     } else if (session_desktop >= 0)
 440         screen_set_desktop(MIN((guint)session_desktop,
 441                                screen_num_desktops), FALSE);
 442     else
 443         screen_set_desktop(MIN(config_screen_firstdesk,
 444                                screen_num_desktops) - 1, FALSE);
 445     screen_last_desktop = screen_desktop;
 446
 447     /* don't start in showing-desktop mode */
 448     screen_showing_desktop = FALSE;
 449     OBT_PROP_SET32(obt_root(ob_screen),
 450                    NET_SHOWING_DESKTOP, CARDINAL, screen_showing_desktop);
 451
 452     if (session_desktop_layout_present &&
 453         screen_validate_layout(&session_desktop_layout))
 454     {
 455         screen_desktop_layout = session_desktop_layout;
 456     }
 457     else
 458         screen_update_layout();
 459 }
 460
 461 void screen_shutdown(gboolean reconfig)
 462 {
 463     pager_popup_free(desktop_popup);
 464
 465     if (reconfig)
 466         return;
 467
 468     XSelectInput(obt_display, obt_root(ob_screen), NoEventMask);
 469
 470     /* we're not running here no more! */
 471     OBT_PROP_ERASE(obt_root(ob_screen), OPENBOX_PID);
 472     /* not without us */
 473     OBT_PROP_ERASE(obt_root(ob_screen), NET_SUPPORTED);
 474     /* don't keep this mode */
 475     OBT_PROP_ERASE(obt_root(ob_screen), NET_SHOWING_DESKTOP);
 476
 477     XDestroyWindow(obt_display, screen_support_win);
 478
 479     g_strfreev(screen_desktop_names);
 480     screen_desktop_names = NULL;
 481 }
 482
 483 void screen_resize(void)
 484 {
 485     gint w, h;
 486     GList *it;
 487     gulong geometry[2];
 488
 489     w = WidthOfScreen(ScreenOfDisplay(obt_display, ob_screen));
 490     h = HeightOfScreen(ScreenOfDisplay(obt_display, ob_screen));
 491
 492     /* Set the _NET_DESKTOP_GEOMETRY hint */
 493     screen_physical_size.width = geometry[0] = w;
 494     screen_physical_size.height = geometry[1] = h;
 495     OBT_PROP_SETA32(obt_root(ob_screen),
 496                     NET_DESKTOP_GEOMETRY, CARDINAL, geometry, 2);
 497
 498     if (ob_state() != OB_STATE_RUNNING)
 499         return;
 500
 501     /* this calls screen_update_areas(), which we need ! */
 502     dock_configure();
 503
 504     for (it = client_list; it; it = g_list_next(it)) {
 505         client_move_onscreen(it->data, FALSE);
 506         client_reconfigure(it->data, FALSE);
 507     }
 508 }
 509
 510 void screen_set_num_desktops(guint num)
 511 {
 512     gulong *viewport;
 513     GList *it, *stacking_copy;
 514
 515     g_assert(num > 0);
 516
 517     if (screen_num_desktops == num) return;
 518
 519     screen_num_desktops = num;
 520     OBT_PROP_SET32(obt_root(ob_screen), NET_NUMBER_OF_DESKTOPS, CARDINAL, num);
 521
 522     /* set the viewport hint */
 523     viewport = g_new0(gulong, num * 2);
 524     OBT_PROP_SETA32(obt_root(ob_screen),
 525                     NET_DESKTOP_VIEWPORT, CARDINAL, viewport, num * 2);
 526     g_free(viewport);
 527
 528     /* the number of rows/columns will differ */
 529     screen_update_layout();
 530
 531     /* move windows on desktops that will no longer exist!
 532        make a copy of the list cuz we're changing it */
 533     stacking_copy = g_list_copy(stacking_list);
 534     for (it = g_list_last(stacking_copy); it; it = g_list_previous(it)) {
 535         if (WINDOW_IS_CLIENT(it->data)) {
 536             ObClient *c = it->data;
 537             if (c->desktop != DESKTOP_ALL && c->desktop >= num)
 538                 client_set_desktop(c, num - 1, FALSE, TRUE);
 539             /* raise all the windows that are on the current desktop which
 540                is being merged */
 541             else if (screen_desktop == num - 1 &&
 542                      (c->desktop == DESKTOP_ALL ||
 543                       c->desktop == screen_desktop))
 544                 stacking_raise(CLIENT_AS_WINDOW(c));
 545         }
 546     }
 547     g_list_free(stacking_copy);
 548
 549     /* change our struts/area to match (after moving windows) */
 550     screen_update_areas();
 551
 552     /* may be some unnamed desktops that we need to fill in with names
 553        (after updating the areas so the popup can resize) */
 554     screen_update_desktop_names();
 555
 556     /* change our desktop if we're on one that no longer exists! */
 557     if (screen_desktop >= screen_num_desktops)
 558         screen_set_desktop(num - 1, TRUE);
 559 }
 560
 561 static void screen_fallback_focus(void)
 562 {
 563     ObClient *c;
 564     gboolean allow_omni;
 565
 566     /* only allow omnipresent windows to get focus on desktop change if
 567        an omnipresent window is already focused (it'll keep focus probably, but
 568        maybe not depending on mouse-focus options) */
 569     allow_omni = focus_client && (client_normal(focus_client) &&
 570                                   focus_client->desktop == DESKTOP_ALL);
 571
 572     /* the client moved there already so don't move focus. prevent flicker
 573        on sendtodesktop + follow */
 574     if (focus_client && focus_client->desktop == screen_desktop)
 575         return;
 576
 577     /* have to try focus here because when you leave an empty desktop
 578        there is no focus out to watch for. also, we have different rules
 579        here. we always allow it to look under the mouse pointer if
 580        config_focus_last is FALSE
 581
 582        do this before hiding the windows so if helper windows are coming
 583        with us, they don't get hidden
 584     */
 585     if ((c = focus_fallback(TRUE, !config_focus_last, allow_omni,
 586                             !allow_omni)))
 587     {
 588         /* only do the flicker reducing stuff ahead of time if we are going
 589            to call xsetinputfocus on the window ourselves. otherwise there is
 590            no guarantee the window will actually take focus.. */
 591         if (c->can_focus) {
 592             /* reduce flicker by hiliting now rather than waiting for the
 593                server FocusIn event */
 594             frame_adjust_focus(c->frame, TRUE);
 595             /* do this here so that if you switch desktops to a window with
 596                helper windows then the helper windows won't flash */
 597             client_bring_helper_windows(c);
 598         }
 599     }
 600 }
 601
 602 static gboolean last_desktop_func(gpointer data)
 603 {
 604     screen_desktop_timeout = TRUE;
 605     screen_desktop_timer = 0;
 606     return FALSE; /* don't repeat */
 607 }
 608
 609 void screen_set_desktop(guint num, gboolean dofocus)
 610 {
 611     GList *it;
 612     guint previous;
 613     gulong ignore_start;
 614
 615     g_assert(num < screen_num_desktops);
 616
 617     previous = screen_desktop;
 618     screen_desktop = num;
 619
 620     if (previous == num) return;
 621
 622     OBT_PROP_SET32(obt_root(ob_screen), NET_CURRENT_DESKTOP, CARDINAL, num);
 623
 624     /* This whole thing decides when/how to save the screen_last_desktop so
 625        that it can be restored later if you want */
 626     if (screen_desktop_timeout) {
 627         /* If screen_desktop_timeout is true, then we've been on this desktop
 628            long enough and we can save it as the last desktop. */
 629
 630         if (screen_last_desktop == previous)
 631             /* this is the startup state only */
 632             screen_old_desktop = screen_desktop;
 633         else {
 634             /* save the "last desktop" as the "old desktop" */
 635             screen_old_desktop = screen_last_desktop;
 636             /* save the desktop we're coming from as the "last desktop" */
 637             screen_last_desktop = previous;
 638         }
 639     }
 640     else {
 641         /* If screen_desktop_timeout is false, then we just got to this desktop
 642            and we are moving away again. */
 643
 644         if (screen_desktop == screen_last_desktop) {
 645             /* If we are moving to the "last desktop" .. */
 646             if (previous == screen_old_desktop) {
 647                 /* .. from the "old desktop", change the last desktop to
 648                    be where we are coming from */
 649                 screen_last_desktop = screen_old_desktop;
 650             }
 651             else if (screen_last_desktop == screen_old_desktop) {
 652                 /* .. and also to the "old desktop", change the "last
 653                    desktop" to be where we are coming from */
 654                 screen_last_desktop = previous;
 655             }
 656             else {
 657                 /* .. from some other desktop, then set the "last desktop" to
 658                    be the saved "old desktop", i.e. where we were before the
 659                    "last desktop" */
 660                 screen_last_desktop = screen_old_desktop;
 661             }
 662         }
 663         else {
 664             /* If we are moving to any desktop besides the "last desktop"..
 665                (this is the normal case) */
 666             if (screen_desktop == screen_old_desktop) {
 667                 /* If moving to the "old desktop", which is not the
 668                    "last desktop", don't save anything */
 669             }
 670             else if (previous == screen_old_desktop) {
 671                 /* If moving from the "old desktop", and not to the
 672                    "last desktop", don't save anything */
 673             }
 674             else if (screen_last_desktop == screen_old_desktop) {
 675                 /* If the "last desktop" is the same as "old desktop" and
 676                    you're not moving to the "last desktop" then save where
 677                    we're coming from as the "last desktop" */
 678                 screen_last_desktop = previous;
 679             }
 680             else {
 681                 /* If the "last desktop" is different from the "old desktop"
 682                    and you're not moving to the "last desktop", then don't save
 683                    anything */
 684             }
 685         }
 686     }
 687     screen_desktop_timeout = FALSE;
 688     if (screen_desktop_timer) g_source_remove(screen_desktop_timer);
 689     screen_desktop_timer = g_timeout_add(REMEMBER_LAST_DESKTOP_TIME,
 690                                          last_desktop_func, NULL);
 691
 692     ob_debug("Moving to desktop %d", num+1);
 693
 694     if (ob_state() == OB_STATE_RUNNING)
 695         screen_show_desktop_popup(screen_desktop, FALSE);
 696
 697     /* ignore enter events caused by the move */
 698     ignore_start = event_start_ignore_all_enters();
 699
 700     if (moveresize_client)
 701         client_set_desktop(moveresize_client, num, TRUE, FALSE);
 702
 703     /* show windows before hiding the rest to lessen the enter/leave events */
 704
 705     /* show windows from top to bottom */
 706     for (it = stacking_list; it; it = g_list_next(it)) {
 707         if (WINDOW_IS_CLIENT(it->data)) {
 708             ObClient *c = it->data;
 709             client_show(c);
 710         }
 711     }
 712
 713     if (dofocus) screen_fallback_focus();
 714
 715     /* hide windows from bottom to top */
 716     for (it = g_list_last(stacking_list); it; it = g_list_previous(it)) {
 717         if (WINDOW_IS_CLIENT(it->data)) {
 718             ObClient *c = it->data;
 719             if (client_hide(c)) {
 720                 if (c == focus_client) {
 721                     /* c was focused and we didn't do fallback clearly so make
 722                        sure openbox doesnt still consider the window focused.
 723                        this happens when using NextWindow with allDesktops,
 724                        since it doesnt want to move focus on desktop change,
 725                        but the focus is not going to stay with the current
 726                        window, which has now disappeared.
 727                        only do this if the client was actually hidden,
 728                        otherwise it can keep focus. */
 729                     focus_set_client(NULL);
 730                 }
 731             }
 732         }
 733     }
 734
 735     focus_cycle_addremove(NULL, TRUE);
 736
 737     event_end_ignore_all_enters(ignore_start);
 738
 739     if (event_source_time() != CurrentTime)
 740         screen_desktop_user_time = event_source_time();
 741 }
 742
 743 void screen_add_desktop(gboolean current)
 744 {
 745     gulong ignore_start;
 746
 747     /* ignore enter events caused by this */
 748     ignore_start = event_start_ignore_all_enters();
 749
 750     screen_set_num_desktops(screen_num_desktops+1);
 751
 752     /* move all the clients over */
 753     if (current) {
 754         GList *it;
 755
 756         for (it = client_list; it; it = g_list_next(it)) {
 757             ObClient *c = it->data;
 758             if (c->desktop != DESKTOP_ALL && c->desktop >= screen_desktop &&
 759                 /* don't move direct children, they'll be moved with their
 760                    parent - which will have to be on the same desktop */
 761                 !client_direct_parent(c))
 762             {
 763                 ob_debug("moving window %s", c->title);
 764                 client_set_desktop(c, c->desktop+1, FALSE, TRUE);
 765             }
 766         }
 767     }
 768
 769     event_end_ignore_all_enters(ignore_start);
 770 }
 771
 772 void screen_remove_desktop(gboolean current)
 773 {
 774     guint rmdesktop, movedesktop;
 775     GList *it, *stacking_copy;
 776     gulong ignore_start;
 777
 778     if (screen_num_desktops <= 1) return;
 779
 780     /* ignore enter events caused by this */
 781     ignore_start = event_start_ignore_all_enters();
 782
 783     /* what desktop are we removing and moving to? */
 784     if (current)
 785         rmdesktop = screen_desktop;
 786     else
 787         rmdesktop = screen_num_desktops - 1;
 788     if (rmdesktop < screen_num_desktops - 1)
 789         movedesktop = rmdesktop + 1;
 790     else
 791         movedesktop = rmdesktop;
 792
 793     /* make a copy of the list cuz we're changing it */
 794     stacking_copy = g_list_copy(stacking_list);
 795     for (it = g_list_last(stacking_copy); it; it = g_list_previous(it)) {
 796         if (WINDOW_IS_CLIENT(it->data)) {
 797             ObClient *c = it->data;
 798             guint d = c->desktop;
 799             if (d != DESKTOP_ALL && d >= movedesktop &&
 800                 /* don't move direct children, they'll be moved with their
 801                    parent - which will have to be on the same desktop */
 802                 !client_direct_parent(c))
 803             {
 804                 ob_debug("moving window %s", c->title);
 805                 client_set_desktop(c, c->desktop - 1, TRUE, TRUE);
 806             }
 807             /* raise all the windows that are on the current desktop which
 808                is being merged */
 809             if ((screen_desktop == rmdesktop - 1 ||
 810                  screen_desktop == rmdesktop) &&
 811                 (d == DESKTOP_ALL || d == screen_desktop))
 812             {
 813                 stacking_raise(CLIENT_AS_WINDOW(c));
 814                 ob_debug("raising window %s", c->title);
 815             }
 816         }
 817     }
 818     g_list_free(stacking_copy);
 819
 820     /* fallback focus like we're changing desktops */
 821     if (screen_desktop < screen_num_desktops - 1) {
 822         screen_fallback_focus();
 823         ob_debug("fake desktop change");
 824     }
 825
 826     screen_set_num_desktops(screen_num_desktops-1);
 827
 828     event_end_ignore_all_enters(ignore_start);
 829 }
 830
 831 static void get_row_col(guint d, guint *r, guint *c)
 832 {
 833     switch (screen_desktop_layout.orientation) {
 834     case OB_ORIENTATION_HORZ:
 835         switch (screen_desktop_layout.start_corner) {
 836         case OB_CORNER_TOPLEFT:
 837             *r = d / screen_desktop_layout.columns;
 838             *c = d % screen_desktop_layout.columns;
 839             break;
 840         case OB_CORNER_BOTTOMLEFT:
 841             *r = screen_desktop_layout.rows - 1 -
 842                 d / screen_desktop_layout.columns;
 843             *c = d % screen_desktop_layout.columns;
 844             break;
 845         case OB_CORNER_TOPRIGHT:
 846             *r = d / screen_desktop_layout.columns;
 847             *c = screen_desktop_layout.columns - 1 -
 848                 d % screen_desktop_layout.columns;
 849             break;
 850         case OB_CORNER_BOTTOMRIGHT:
 851             *r = screen_desktop_layout.rows - 1 -
 852                 d / screen_desktop_layout.columns;
 853             *c = screen_desktop_layout.columns - 1 -
 854                 d % screen_desktop_layout.columns;
 855             break;
 856         }
 857         break;
 858     case OB_ORIENTATION_VERT:
 859         switch (screen_desktop_layout.start_corner) {
 860         case OB_CORNER_TOPLEFT:
 861             *r = d % screen_desktop_layout.rows;
 862             *c = d / screen_desktop_layout.rows;
 863             break;
 864         case OB_CORNER_BOTTOMLEFT:
 865             *r = screen_desktop_layout.rows - 1 -
 866                 d % screen_desktop_layout.rows;
 867             *c = d / screen_desktop_layout.rows;
 868             break;
 869         case OB_CORNER_TOPRIGHT:
 870             *r = d % screen_desktop_layout.rows;
 871             *c = screen_desktop_layout.columns - 1 -
 872                 d / screen_desktop_layout.rows;
 873             break;
 874         case OB_CORNER_BOTTOMRIGHT:
 875             *r = screen_desktop_layout.rows - 1 -
 876                 d % screen_desktop_layout.rows;
 877             *c = screen_desktop_layout.columns - 1 -
 878                 d / screen_desktop_layout.rows;
 879             break;
 880         }
 881         break;
 882     }
 883 }
 884
 885 static guint translate_row_col(guint r, guint c)
 886 {
 887     switch (screen_desktop_layout.orientation) {
 888     case OB_ORIENTATION_HORZ:
 889         switch (screen_desktop_layout.start_corner) {
 890         case OB_CORNER_TOPLEFT:
 891             return r % screen_desktop_layout.rows *
 892                 screen_desktop_layout.columns +
 893                 c % screen_desktop_layout.columns;
 894         case OB_CORNER_BOTTOMLEFT:
 895             return (screen_desktop_layout.rows - 1 -
 896                     r % screen_desktop_layout.rows) *
 897                 screen_desktop_layout.columns +
 898                 c % screen_desktop_layout.columns;
 899         case OB_CORNER_TOPRIGHT:
 900             return r % screen_desktop_layout.rows *
 901                 screen_desktop_layout.columns +
 902                 (screen_desktop_layout.columns - 1 -
 903                  c % screen_desktop_layout.columns);
 904         case OB_CORNER_BOTTOMRIGHT:
 905             return (screen_desktop_layout.rows - 1 -
 906                     r % screen_desktop_layout.rows) *
 907                 screen_desktop_layout.columns +
 908                 (screen_desktop_layout.columns - 1 -
 909                  c % screen_desktop_layout.columns);
 910         }
 911     case OB_ORIENTATION_VERT:
 912         switch (screen_desktop_layout.start_corner) {
 913         case OB_CORNER_TOPLEFT:
 914             return c % screen_desktop_layout.columns *
 915                 screen_desktop_layout.rows +
 916                 r % screen_desktop_layout.rows;
 917         case OB_CORNER_BOTTOMLEFT:
 918             return c % screen_desktop_layout.columns *
 919                 screen_desktop_layout.rows +
 920                 (screen_desktop_layout.rows - 1 -
 921                  r % screen_desktop_layout.rows);
 922         case OB_CORNER_TOPRIGHT:
 923             return (screen_desktop_layout.columns - 1 -
 924                     c % screen_desktop_layout.columns) *
 925                 screen_desktop_layout.rows +
 926                 r % screen_desktop_layout.rows;
 927         case OB_CORNER_BOTTOMRIGHT:
 928             return (screen_desktop_layout.columns - 1 -
 929                     c % screen_desktop_layout.columns) *
 930                 screen_desktop_layout.rows +
 931                 (screen_desktop_layout.rows - 1 -
 932                  r % screen_desktop_layout.rows);
 933         }
 934     }
 935     g_assert_not_reached();
 936     return 0;
 937 }
 938
 939 static gboolean hide_desktop_popup_func(gpointer data)
 940 {
 941     pager_popup_hide(desktop_popup);
 942     desktop_popup_timer = 0;
 943     return FALSE; /* don't repeat */
 944 }
 945
 946 void screen_show_desktop_popup(guint d, gboolean perm)
 947 {
 948     const Rect *a;
 949
 950     /* 0 means don't show the popup */
 951     if (!config_desktop_popup_time) return;
 952
 953     a = screen_physical_area_primary(FALSE);
 954     pager_popup_position(desktop_popup, CenterGravity,
 955                          a->x + a->width / 2, a->y + a->height / 2);
 956     pager_popup_icon_size_multiplier(desktop_popup,
 957                                      (screen_desktop_layout.columns /
 958                                       screen_desktop_layout.rows) / 2,
 959                                      (screen_desktop_layout.rows/
 960                                       screen_desktop_layout.columns) / 2);
 961     pager_popup_max_width(desktop_popup,
 962                           MAX(a->width/3, POPUP_WIDTH));
 963     pager_popup_show(desktop_popup, screen_desktop_names[d], d);
 964
 965     if (desktop_popup_timer) g_source_remove(desktop_popup_timer);
 966     desktop_popup_timer = 0;
 967     if (!perm && !desktop_popup_perm)
 968         /* only hide if its not already being show permanently */
 969         desktop_popup_timer = g_timeout_add(config_desktop_popup_time,
 970                                             hide_desktop_popup_func,
 971                                             desktop_popup);
 972     if (perm)
 973         desktop_popup_perm = TRUE;
 974 }
 975
 976 void screen_hide_desktop_popup(void)
 977 {
 978     if (desktop_popup_timer) g_source_remove(desktop_popup_timer);
 979     desktop_popup_timer = 0;
 980     pager_popup_hide(desktop_popup);
 981     desktop_popup_perm = FALSE;
 982 }
 983
 984 guint screen_find_desktop(guint from, ObDirection dir,
 985                           gboolean wrap, gboolean linear)
 986 {
 987     guint r, c;
 988     guint d;
 989
 990     d = from;
 991     get_row_col(d, &r, &c);
 992     if (linear) {
 993         switch (dir) {
 994         case OB_DIRECTION_EAST:
 995             if (d < screen_num_desktops - 1)
 996                 ++d;
 997             else if (wrap)
 998                 d = 0;
 999             else
1000                 return from;
1001             break;
1002         case OB_DIRECTION_WEST:
1003             if (d > 0)
1004                 --d;
1005             else if (wrap)
1006                 d = screen_num_desktops - 1;
1007             else
1008                 return from;
1009             break;
1010         default:
1011             g_assert_not_reached();
1012             return from;
1013         }
1014     } else {
1015         switch (dir) {
1016         case OB_DIRECTION_EAST:
1017             ++c;
1018             if (c >= screen_desktop_layout.columns) {
1019                 if (wrap)
1020                     c = 0;
1021                 else
1022                     return from;
1023             }
1024             d = translate_row_col(r, c);
1025             if (d >= screen_num_desktops) {
1026                 if (wrap)
1027                     ++c;
1028                 else
1029                     return from;
1030             }
1031             break;
1032         case OB_DIRECTION_WEST:
1033             --c;
1034             if (c >= screen_desktop_layout.columns) {
1035                 if (wrap)
1036                     c = screen_desktop_layout.columns - 1;
1037                 else
1038                     return from;
1039             }
1040             d = translate_row_col(r, c);
1041             if (d >= screen_num_desktops) {
1042                 if (wrap)
1043                     --c;
1044                 else
1045                     return from;
1046             }
1047             break;
1048         case OB_DIRECTION_SOUTH:
1049             ++r;
1050             if (r >= screen_desktop_layout.rows) {
1051                 if (wrap)
1052                     r = 0;
1053                 else
1054                     return from;
1055             }
1056             d = translate_row_col(r, c);
1057             if (d >= screen_num_desktops) {
1058                 if (wrap)
1059                     ++r;
1060                 else
1061                     return from;
1062             }
1063             break;
1064         case OB_DIRECTION_NORTH:
1065             --r;
1066             if (r >= screen_desktop_layout.rows) {
1067                 if (wrap)
1068                     r = screen_desktop_layout.rows - 1;
1069                 else
1070                     return from;
1071             }
1072             d = translate_row_col(r, c);
1073             if (d >= screen_num_desktops) {
1074                 if (wrap)
1075                     --r;
1076                 else
1077                     return from;
1078             }
1079             break;
1080         default:
1081             g_assert_not_reached();
1082             return from;
1083         }
1084
1085         d = translate_row_col(r, c);
1086     }
1087     return d;
1088 }
1089
1090 static gboolean screen_validate_layout(ObDesktopLayout *l)
1091 {
1092     if (l->columns == 0 && l->rows == 0) /* both 0's is bad data.. */
1093         return FALSE;
1094
1095     /* fill in a zero rows/columns */
1096     if (l->columns == 0) {
1097         l->columns = screen_num_desktops / l->rows;
1098         if (l->rows * l->columns < screen_num_desktops)
1099             l->columns++;
1100         if (l->rows * l->columns >= screen_num_desktops + l->columns)
1101             l->rows--;
1102     } else if (l->rows == 0) {
1103         l->rows = screen_num_desktops / l->columns;
1104         if (l->columns * l->rows < screen_num_desktops)
1105             l->rows++;
1106         if (l->columns * l->rows >= screen_num_desktops + l->rows)
1107             l->columns--;
1108     }
1109
1110     /* bounds checking */
1111     if (l->orientation == OB_ORIENTATION_HORZ) {
1112         l->columns = MIN(screen_num_desktops, l->columns);
1113         l->rows = MIN(l->rows,
1114                       (screen_num_desktops + l->columns - 1) / l->columns);
1115         l->columns = screen_num_desktops / l->rows +
1116             !!(screen_num_desktops % l->rows);
1117     } else {
1118         l->rows = MIN(screen_num_desktops, l->rows);
1119         l->columns = MIN(l->columns,
1120                          (screen_num_desktops + l->rows - 1) / l->rows);
1121         l->rows = screen_num_desktops / l->columns +
1122             !!(screen_num_desktops % l->columns);
1123     }
1124     return TRUE;
1125 }
1126
1127 void screen_update_layout(void)
1128
1129 {
1130     ObDesktopLayout l;
1131     guint32 *data;
1132     guint num;
1133
1134     screen_desktop_layout.orientation = OB_ORIENTATION_HORZ;
1135     screen_desktop_layout.start_corner = OB_CORNER_TOPLEFT;
1136     screen_desktop_layout.rows = 1;
1137     screen_desktop_layout.columns = screen_num_desktops;
1138
1139     if (OBT_PROP_GETA32(obt_root(ob_screen),
1140                         NET_DESKTOP_LAYOUT, CARDINAL, &data, &num)) {
1141         if (num == 3 || num == 4) {
1142
1143             if (data[0] == OBT_PROP_ATOM(NET_WM_ORIENTATION_VERT))
1144                 l.orientation = OB_ORIENTATION_VERT;
1145             else if (data[0] == OBT_PROP_ATOM(NET_WM_ORIENTATION_HORZ))
1146                 l.orientation = OB_ORIENTATION_HORZ;
1147             else
1148                 return;
1149
1150             if (num < 4)
1151                 l.start_corner = OB_CORNER_TOPLEFT;
1152             else {
1153                 if (data[3] == OBT_PROP_ATOM(NET_WM_TOPLEFT))
1154                     l.start_corner = OB_CORNER_TOPLEFT;
1155                 else if (data[3] == OBT_PROP_ATOM(NET_WM_TOPRIGHT))
1156                     l.start_corner = OB_CORNER_TOPRIGHT;
1157                 else if (data[3] == OBT_PROP_ATOM(NET_WM_BOTTOMRIGHT))
1158                     l.start_corner = OB_CORNER_BOTTOMRIGHT;
1159                 else if (data[3] == OBT_PROP_ATOM(NET_WM_BOTTOMLEFT))
1160                     l.start_corner = OB_CORNER_BOTTOMLEFT;
1161                 else
1162                     return;
1163             }
1164
1165             l.columns = data[1];
1166             l.rows = data[2];
1167
1168             if (screen_validate_layout(&l))
1169                 screen_desktop_layout = l;
1170
1171             g_free(data);
1172         }
1173     }
1174 }
1175
1176 void screen_update_desktop_names(void)
1177 {
1178     guint i;
1179
1180     /* empty the array */
1181     g_strfreev(screen_desktop_names);
1182     screen_desktop_names = NULL;
1183
1184     if (OBT_PROP_GETSS(obt_root(ob_screen),
1185                        NET_DESKTOP_NAMES, &screen_desktop_names))
1186         for (i = 0; screen_desktop_names[i] && i < screen_num_desktops; ++i);
1187     else
1188         i = 0;
1189     if (i < screen_num_desktops) {
1190         GSList *it;
1191
1192         screen_desktop_names = g_renew(gchar*, screen_desktop_names,
1193                                        screen_num_desktops + 1);
1194         screen_desktop_names[screen_num_desktops] = NULL;
1195
1196         it = g_slist_nth(config_desktops_names, i);
1197
1198         for (; i < screen_num_desktops; ++i) {
1199             if (it && ((char*)it->data)[0]) /* not empty */
1200                 /* use the names from the config file when possible */
1201                 screen_desktop_names[i] = g_strdup(it->data);
1202             else
1203                 /* make up a nice name if it's not though */
1204                 screen_desktop_names[i] = g_strdup_printf(_("desktop %i"),
1205                                                           i + 1);
1206             if (it) it = g_slist_next(it);
1207         }
1208
1209         /* if we changed any names, then set the root property so we can
1210            all agree on the names */
1211         OBT_PROP_SETSS(obt_root(ob_screen), NET_DESKTOP_NAMES,
1212                        (const gchar*const*)screen_desktop_names);
1213     }
1214
1215     /* resize the pager for these names */
1216     pager_popup_text_width_to_strings(desktop_popup,
1217                                       screen_desktop_names,
1218                                       screen_num_desktops);
1219 }
1220
1221 void screen_show_desktop(gboolean show, ObClient *show_only)
1222 {
1223     GList *it;
1224
1225     if (show == screen_showing_desktop) return; /* no change */
1226
1227     screen_showing_desktop = show;
1228
1229     if (show) {
1230         /* hide windows bottom to top */
1231         for (it = g_list_last(stacking_list); it; it = g_list_previous(it)) {
1232             if (WINDOW_IS_CLIENT(it->data)) {
1233                 ObClient *client = it->data;
1234                 client_showhide(client);
1235             }
1236         }
1237     }
1238     else {
1239         /* restore windows top to bottom */
1240         for (it = stacking_list; it; it = g_list_next(it)) {
1241             if (WINDOW_IS_CLIENT(it->data)) {
1242                 ObClient *client = it->data;
1243                 if (client_should_show(client)) {
1244                     if (!show_only || client == show_only)
1245                         client_show(client);
1246                     else
1247                         client_iconify(client, TRUE, FALSE, TRUE);
1248                 }
1249             }
1250         }
1251     }
1252
1253     if (show) {
1254         /* focus the desktop */
1255         for (it = focus_order; it; it = g_list_next(it)) {
1256             ObClient *c = it->data;
1257             if (c->type == OB_CLIENT_TYPE_DESKTOP &&
1258                 (c->desktop == screen_desktop || c->desktop == DESKTOP_ALL) &&
1259                 client_focus(it->data))
1260                 break;
1261         }
1262     }
1263     else if (!show_only) {
1264         ObClient *c;
1265
1266         if ((c = focus_fallback(TRUE, FALSE, TRUE, FALSE))) {
1267             /* only do the flicker reducing stuff ahead of time if we are going
1268                to call xsetinputfocus on the window ourselves. otherwise there
1269                is no guarantee the window will actually take focus.. */
1270             if (c->can_focus) {
1271                 /* reduce flicker by hiliting now rather than waiting for the
1272                    server FocusIn event */
1273                 frame_adjust_focus(c->frame, TRUE);
1274             }
1275         }
1276     }
1277
1278     show = !!show; /* make it boolean */
1279     OBT_PROP_SET32(obt_root(ob_screen), NET_SHOWING_DESKTOP, CARDINAL, show);
1280 }
1281
1282 void screen_install_colormap(ObClient *client, gboolean install)
1283 {
1284     if (client == NULL || client->colormap == None) {
1285         if (install)
1286             XInstallColormap(obt_display, RrColormap(ob_rr_inst));
1287         else
1288             XUninstallColormap(obt_display, RrColormap(ob_rr_inst));
1289     } else {
1290         obt_display_ignore_errors(TRUE);
1291         if (install)
1292             XInstallColormap(obt_display, client->colormap);
1293         else
1294             XUninstallColormap(obt_display, client->colormap);
1295         obt_display_ignore_errors(FALSE);
1296     }
1297 }
1298
1299 typedef struct {
1300     guint desktop;
1301     StrutPartial *strut;
1302 } ObScreenStrut;
1303
1304 #define RESET_STRUT_LIST(sl) \
1305     while (sl) { \
1306         g_slice_free(ObScreenStrut, (sl)->data); \
1307         sl = g_slist_delete_link(sl, sl); \
1308     }
1309
1310 #define ADD_STRUT_TO_LIST(sl, d, s) \
1311 { \
1312     ObScreenStrut *ss = g_slice_new(ObScreenStrut); \
1313     ss->desktop = d; \
1314     ss->strut = s;  \
1315     sl = g_slist_prepend(sl, ss); \
1316 }
1317
1318 #define VALIDATE_STRUTS(sl, side, max) \
1319 { \
1320     GSList *it; \
1321     for (it = sl; it; it = g_slist_next(it)) { \
1322       ObScreenStrut *ss = it->data; \
1323       ss->strut->side = MIN(max, ss->strut->side); \
1324     } \
1325 }
1326
1327 static void get_xinerama_screens(Rect **xin_areas, guint *nxin)
1328 {
1329     guint i;
1330     gint n, l, r, t, b;
1331 #ifdef XINERAMA
1332     XineramaScreenInfo *info;
1333 #endif
1334
1335     if (ob_debug_xinerama) {
1336         gint w = WidthOfScreen(ScreenOfDisplay(obt_display, ob_screen));
1337         gint h = HeightOfScreen(ScreenOfDisplay(obt_display, ob_screen));
1338         *nxin = 2;
1339         *xin_areas = g_new(Rect, *nxin + 1);
1340         RECT_SET((*xin_areas)[0], 0, 0, w/2, h);
1341         RECT_SET((*xin_areas)[1], w/2, 0, w-(w/2), h);
1342     }
1343 #ifdef XINERAMA
1344     else if (obt_display_extension_xinerama &&
1345              (info = XineramaQueryScreens(obt_display, &n))) {
1346         *nxin = n;
1347         *xin_areas = g_new(Rect, *nxin + 1);
1348         for (i = 0; i < *nxin; ++i)
1349             RECT_SET((*xin_areas)[i], info[i].x_org, info[i].y_org,
1350                      info[i].width, info[i].height);
1351         XFree(info);
1352     }
1353 #endif
1354     else {
1355         *nxin = 1;
1356         *xin_areas = g_new(Rect, *nxin + 1);
1357         RECT_SET((*xin_areas)[0], 0, 0,
1358                  WidthOfScreen(ScreenOfDisplay(obt_display, ob_screen)),
1359                  HeightOfScreen(ScreenOfDisplay(obt_display, ob_screen)));
1360     }
1361
1362     /* returns one extra with the total area in it */
1363     l = (*xin_areas)[0].x;
1364     t = (*xin_areas)[0].y;
1365     r = (*xin_areas)[0].x + (*xin_areas)[0].width - 1;
1366     b = (*xin_areas)[0].y + (*xin_areas)[0].height - 1;
1367     for (i = 1; i < *nxin; ++i) {
1368         l = MIN(l, (*xin_areas)[i].x);
1369         t = MIN(l, (*xin_areas)[i].y);
1370         r = MAX(r, (*xin_areas)[i].x + (*xin_areas)[i].width - 1);
1371         b = MAX(b, (*xin_areas)[i].y + (*xin_areas)[i].height - 1);
1372     }
1373     RECT_SET((*xin_areas)[*nxin], l, t, r - l + 1, b - t + 1);
1374
1375     for (i = 0; i < *nxin; ++i)
1376         ob_debug("Monitor %d @ %d,%d %dx%d\n", i,
1377                  (*xin_areas)[i].x, (*xin_areas)[i].y,
1378                  (*xin_areas)[i].width, (*xin_areas)[i].height);
1379     ob_debug("Full desktop @ %d,%d %dx%d\n",
1380              (*xin_areas)[i].x, (*xin_areas)[i].y,
1381              (*xin_areas)[i].width, (*xin_areas)[i].height);
1382 }
1383
1384 void screen_update_areas(void)
1385 {
1386     guint i;
1387     gulong *dims;
1388     GList *it, *onscreen;
1389
1390     /* collect the clients that are on screen */
1391     onscreen = NULL;
1392     for (it = client_list; it; it = g_list_next(it)) {
1393         if (client_monitor(it->data) != screen_num_monitors)
1394             onscreen = g_list_prepend(onscreen, it->data);
1395     }
1396
1397     g_free(monitor_area);
1398     get_xinerama_screens(&monitor_area, &screen_num_monitors);
1399
1400     /* set up the user-specified margins */
1401     config_margins.top_start = RECT_LEFT(monitor_area[screen_num_monitors]);
1402     config_margins.top_end = RECT_RIGHT(monitor_area[screen_num_monitors]);
1403     config_margins.bottom_start = RECT_LEFT(monitor_area[screen_num_monitors]);
1404     config_margins.bottom_end = RECT_RIGHT(monitor_area[screen_num_monitors]);
1405     config_margins.left_start = RECT_TOP(monitor_area[screen_num_monitors]);
1406     config_margins.left_end = RECT_BOTTOM(monitor_area[screen_num_monitors]);
1407     config_margins.right_start = RECT_TOP(monitor_area[screen_num_monitors]);
1408     config_margins.right_end = RECT_BOTTOM(monitor_area[screen_num_monitors]);
1409
1410     RESET_STRUT_LIST(struts_left);
1411     RESET_STRUT_LIST(struts_top);
1412     RESET_STRUT_LIST(struts_right);
1413     RESET_STRUT_LIST(struts_bottom);
1414
1415     /* collect the struts */
1416     for (it = client_list; it; it = g_list_next(it)) {
1417         ObClient *c = it->data;
1418         if (c->strut.left)
1419             ADD_STRUT_TO_LIST(struts_left, c->desktop, &c->strut);
1420         if (c->strut.top)
1421             ADD_STRUT_TO_LIST(struts_top, c->desktop, &c->strut);
1422         if (c->strut.right)
1423             ADD_STRUT_TO_LIST(struts_right, c->desktop, &c->strut);
1424         if (c->strut.bottom)
1425             ADD_STRUT_TO_LIST(struts_bottom, c->desktop, &c->strut);
1426     }
1427     if (dock_strut.left)
1428         ADD_STRUT_TO_LIST(struts_left, DESKTOP_ALL, &dock_strut);
1429     if (dock_strut.top)
1430         ADD_STRUT_TO_LIST(struts_top, DESKTOP_ALL, &dock_strut);
1431     if (dock_strut.right)
1432         ADD_STRUT_TO_LIST(struts_right, DESKTOP_ALL, &dock_strut);
1433     if (dock_strut.bottom)
1434         ADD_STRUT_TO_LIST(struts_bottom, DESKTOP_ALL, &dock_strut);
1435
1436     if (config_margins.left)
1437         ADD_STRUT_TO_LIST(struts_left, DESKTOP_ALL, &config_margins);
1438     if (config_margins.top)
1439         ADD_STRUT_TO_LIST(struts_top, DESKTOP_ALL, &config_margins);
1440     if (config_margins.right)
1441         ADD_STRUT_TO_LIST(struts_right, DESKTOP_ALL, &config_margins);
1442     if (config_margins.bottom)
1443         ADD_STRUT_TO_LIST(struts_bottom, DESKTOP_ALL, &config_margins);
1444
1445     VALIDATE_STRUTS(struts_left, left,
1446                     monitor_area[screen_num_monitors].width / 2);
1447     VALIDATE_STRUTS(struts_right, right,
1448                     monitor_area[screen_num_monitors].width / 2);
1449     VALIDATE_STRUTS(struts_top, top,
1450                     monitor_area[screen_num_monitors].height / 2);
1451     VALIDATE_STRUTS(struts_bottom, bottom,
1452                     monitor_area[screen_num_monitors].height / 2);
1453
1454     dims = g_new(gulong, 4 * screen_num_desktops);
1455     for (i = 0; i < screen_num_desktops; ++i) {
1456         Rect *area = screen_area(i, SCREEN_AREA_ALL_MONITORS, NULL);
1457         dims[i*4+0] = area->x;
1458         dims[i*4+1] = area->y;
1459         dims[i*4+2] = area->width;
1460         dims[i*4+3] = area->height;
1461         g_slice_free(Rect, area);
1462     }
1463
1464     /* set the legacy workarea hint to the union of all the monitors */
1465     OBT_PROP_SETA32(obt_root(ob_screen), NET_WORKAREA, CARDINAL,
1466                     dims, 4 * screen_num_desktops);
1467
1468     /* the area has changed, adjust all the windows if they need it */
1469     for (it = onscreen; it; it = g_list_next(it))
1470         client_reconfigure(it->data, FALSE);
1471
1472     g_free(dims);
1473 }
1474
1475 #if 0
1476 Rect* screen_area_all_monitors(guint desktop)
1477 {
1478     guint i;
1479     Rect *a;
1480
1481     a = screen_area_monitor(desktop, 0);
1482
1483     /* combine all the monitors together */
1484     for (i = 1; i < screen_num_monitors; ++i) {
1485         Rect *m = screen_area_monitor(desktop, i);
1486         gint l, r, t, b;
1487
1488         l = MIN(RECT_LEFT(*a), RECT_LEFT(*m));
1489         t = MIN(RECT_TOP(*a), RECT_TOP(*m));
1490         r = MAX(RECT_RIGHT(*a), RECT_RIGHT(*m));
1491         b = MAX(RECT_BOTTOM(*a), RECT_BOTTOM(*m));
1492
1493         RECT_SET(*a, l, t, r - l + 1, b - t + 1);
1494
1495         g_free(m);
1496     }
1497
1498     return a;
1499 }
1500 #endif
1501
1502 #define STRUT_LEFT_IN_SEARCH(s, search) \
1503     (RANGES_INTERSECT(search->y, search->height, \
1504                       s->left_start, s->left_end - s->left_start + 1))
1505 #define STRUT_RIGHT_IN_SEARCH(s, search) \
1506     (RANGES_INTERSECT(search->y, search->height, \
1507                       s->right_start, s->right_end - s->right_start + 1))
1508 #define STRUT_TOP_IN_SEARCH(s, search) \
1509     (RANGES_INTERSECT(search->x, search->width, \
1510                       s->top_start, s->top_end - s->top_start + 1))
1511 #define STRUT_BOTTOM_IN_SEARCH(s, search) \
1512     (RANGES_INTERSECT(search->x, search->width, \
1513                       s->bottom_start, s->bottom_end - s->bottom_start + 1))
1514
1515 #define STRUT_LEFT_IGNORE(s, us, search) \
1516     (head == SCREEN_AREA_ALL_MONITORS && us && \
1517      RECT_LEFT(monitor_area[i]) + s->left > RECT_LEFT(*search))
1518 #define STRUT_RIGHT_IGNORE(s, us, search) \
1519     (head == SCREEN_AREA_ALL_MONITORS && us && \
1520      RECT_RIGHT(monitor_area[i]) - s->right < RECT_RIGHT(*search))
1521 #define STRUT_TOP_IGNORE(s, us, search) \
1522     (head == SCREEN_AREA_ALL_MONITORS && us && \
1523      RECT_TOP(monitor_area[i]) + s->top > RECT_TOP(*search))
1524 #define STRUT_BOTTOM_IGNORE(s, us, search) \
1525     (head == SCREEN_AREA_ALL_MONITORS && us && \
1526      RECT_BOTTOM(monitor_area[i]) - s->bottom < RECT_BOTTOM(*search))
1527
1528 Rect* screen_area(guint desktop, guint head, Rect *search)
1529 {
1530     Rect *a;
1531     GSList *it;
1532     gint l, r, t, b;
1533     guint i, d;
1534     gboolean us = search != NULL; /* user provided search */
1535
1536     g_assert(desktop < screen_num_desktops || desktop == DESKTOP_ALL);
1537     g_assert(head < screen_num_monitors || head == SCREEN_AREA_ONE_MONITOR ||
1538              head == SCREEN_AREA_ALL_MONITORS);
1539     g_assert(!(head == SCREEN_AREA_ONE_MONITOR && search == NULL));
1540
1541     /* find any struts for this monitor
1542        which will be affecting the search area.
1543     */
1544
1545     /* search everything if search is null */
1546     if (!search) {
1547         if (head < screen_num_monitors) search = &monitor_area[head];
1548         else search = &monitor_area[screen_num_monitors];
1549     }
1550     if (head == SCREEN_AREA_ONE_MONITOR) head = screen_find_monitor(search);
1551
1552     /* al is "all left" meaning the furthest left you can get, l is our
1553        "working left" meaning our current strut edge which we're calculating
1554     */
1555
1556     /* only include monitors which the search area lines up with */
1557     if (RECT_INTERSECTS_RECT(monitor_area[screen_num_monitors], *search)) {
1558         l = RECT_RIGHT(monitor_area[screen_num_monitors]);
1559         t = RECT_BOTTOM(monitor_area[screen_num_monitors]);
1560         r = RECT_LEFT(monitor_area[screen_num_monitors]);
1561         b = RECT_TOP(monitor_area[screen_num_monitors]);
1562         for (i = 0; i < screen_num_monitors; ++i) {
1563             /* add the monitor if applicable */
1564             if (RANGES_INTERSECT(search->x, search->width,
1565                                  monitor_area[i].x, monitor_area[i].width))
1566             {
1567                 t = MIN(t, RECT_TOP(monitor_area[i]));
1568                 b = MAX(b, RECT_BOTTOM(monitor_area[i]));
1569             }
1570             if (RANGES_INTERSECT(search->y, search->height,
1571                                  monitor_area[i].y, monitor_area[i].height))
1572             {
1573                 l = MIN(l, RECT_LEFT(monitor_area[i]));
1574                 r = MAX(r, RECT_RIGHT(monitor_area[i]));
1575             }
1576         }
1577     } else {
1578         l = RECT_LEFT(monitor_area[screen_num_monitors]);
1579         t = RECT_TOP(monitor_area[screen_num_monitors]);
1580         r = RECT_RIGHT(monitor_area[screen_num_monitors]);
1581         b = RECT_BOTTOM(monitor_area[screen_num_monitors]);
1582     }
1583
1584     for (d = 0; d < screen_num_desktops; ++d) {
1585         if (d != desktop && desktop != DESKTOP_ALL) continue;
1586
1587         for (i = 0; i < screen_num_monitors; ++i) {
1588             if (head != SCREEN_AREA_ALL_MONITORS && head != i) continue;
1589
1590             for (it = struts_left; it; it = g_slist_next(it)) {
1591                 ObScreenStrut *s = it->data;
1592                 if ((s->desktop == d || s->desktop == DESKTOP_ALL) &&
1593                     STRUT_LEFT_IN_SEARCH(s->strut, search) &&
1594                     !STRUT_LEFT_IGNORE(s->strut, us, search))
1595                     l = MAX(l, RECT_LEFT(monitor_area[screen_num_monitors])
1596                                + s->strut->left);
1597             }
1598             for (it = struts_top; it; it = g_slist_next(it)) {
1599                 ObScreenStrut *s = it->data;
1600                 if ((s->desktop == d || s->desktop == DESKTOP_ALL) &&
1601                     STRUT_TOP_IN_SEARCH(s->strut, search) &&
1602                     !STRUT_TOP_IGNORE(s->strut, us, search))
1603                     t = MAX(t, RECT_TOP(monitor_area[screen_num_monitors])
1604                                + s->strut->top);
1605             }
1606             for (it = struts_right; it; it = g_slist_next(it)) {
1607                 ObScreenStrut *s = it->data;
1608                 if ((s->desktop == d || s->desktop == DESKTOP_ALL) &&
1609                     STRUT_RIGHT_IN_SEARCH(s->strut, search) &&
1610                     !STRUT_RIGHT_IGNORE(s->strut, us, search))
1611                     r = MIN(r, RECT_RIGHT(monitor_area[screen_num_monitors])
1612                                - s->strut->right);
1613             }
1614             for (it = struts_bottom; it; it = g_slist_next(it)) {
1615                 ObScreenStrut *s = it->data;
1616                 if ((s->desktop == d || s->desktop == DESKTOP_ALL) &&
1617                     STRUT_BOTTOM_IN_SEARCH(s->strut, search) &&
1618                     !STRUT_BOTTOM_IGNORE(s->strut, us, search))
1619                     b = MIN(b, RECT_BOTTOM(monitor_area[screen_num_monitors])
1620                                - s->strut->bottom);
1621             }
1622
1623             /* limit to this monitor */
1624             if (head == i) {
1625                 l = MAX(l, RECT_LEFT(monitor_area[i]));
1626                 t = MAX(t, RECT_TOP(monitor_area[i]));
1627                 r = MIN(r, RECT_RIGHT(monitor_area[i]));
1628                 b = MIN(b, RECT_BOTTOM(monitor_area[i]));
1629             }
1630         }
1631     }
1632
1633     a = g_slice_new(Rect);
1634     a->x = l;
1635     a->y = t;
1636     a->width = r - l + 1;
1637     a->height = b - t + 1;
1638     return a;
1639 }
1640
1641 typedef struct {
1642     Rect r;
1643     gboolean subtract;
1644 } RectArithmetic;
1645
1646 guint screen_find_monitor(const Rect *search)
1647 {
1648     guint i;
1649     guint mostpx_index = screen_num_monitors;
1650     guint mostpx = 0;
1651     guint closest_distance_index = screen_num_monitors;
1652     guint closest_distance = G_MAXUINT;
1653     GSList *counted = NULL;
1654
1655     /* we want to count the number of pixels search has on each monitor, but not
1656        double count.  so if a pixel is counted on monitor A then we should not
1657        count it again on monitor B. in the end we want to return the monitor
1658        that had the most pixels counted under this scheme.
1659
1660        this assumes that monitors earlier in the list are more desirable to be
1661        considered the search area's monitor.  we try the configured primary
1662        monitor first, so it gets the highest preference.
1663
1664        if we have counted an area A, then we want to subtract the intersection
1665        of A with the area on future monitors.
1666        but now consider if we count an area B that intersects A. we want to
1667        subtract the area B from that counted on future monitors, but not
1668        subtract the intersection of A and B twice! so we would add the
1669        intersection of A and B back, to account for it being subtracted both
1670        for A and B.
1671
1672        this is the idea behind the algorithm.  we always subtract the full area
1673        for monitor M intersected with the search area. we'll call that AREA.
1674        but then we go through the list |counted| and for each rectangle in
1675        the list that is being subtracted from future monitors, we insert a
1676        request to add back the intersection of the subtracted rect with AREA.
1677        vice versa for a rect in |counted| that is getting added back.
1678     */
1679
1680     if (config_primary_monitor_index < screen_num_monitors) {
1681         const Rect *monitor;
1682         Rect on_current_monitor;
1683         glong area;
1684
1685         monitor = screen_physical_area_monitor(config_primary_monitor_index);
1686
1687         if (RECT_INTERSECTS_RECT(*monitor, *search)) {
1688             RECT_SET_INTERSECTION(on_current_monitor, *monitor, *search);
1689             area = RECT_AREA(on_current_monitor);
1690
1691             if (area > mostpx) {
1692                 mostpx = area;
1693                 mostpx_index = config_primary_monitor_index;
1694             }
1695
1696             /* add the intersection rect on the current monitor to the
1697                counted list. that's easy for the first one, we just mark it for
1698                subtraction */
1699             {
1700                 RectArithmetic *ra = g_slice_new(RectArithmetic);
1701                 ra->r = on_current_monitor;
1702                 ra->subtract = TRUE;
1703                 counted = g_slist_prepend(counted, ra);
1704             }
1705         }
1706     }
1707
1708     for (i = 0; i < screen_num_monitors; ++i) {
1709         const Rect *monitor;
1710         Rect on_current_monitor;
1711         glong area;
1712         GSList *it;
1713
1714         monitor = screen_physical_area_monitor(i);
1715
1716         if (!RECT_INTERSECTS_RECT(*monitor, *search)) {
1717             /* If we don't intersect then find the distance between the search
1718                rect and the monitor. We'll use the closest monitor from this
1719                metric if none of the monitors intersect. */
1720             guint distance = rect_manhatten_distance(*monitor, *search);
1721
1722             if (distance < closest_distance) {
1723                 closest_distance = distance;
1724                 closest_distance_index = i;
1725             }
1726             continue;
1727         }
1728
1729         if (i == config_primary_monitor_index)
1730             continue;  /* already did this one */
1731
1732         RECT_SET_INTERSECTION(on_current_monitor, *monitor, *search);
1733         area = RECT_AREA(on_current_monitor);
1734
1735         /* remove pixels we already counted on any previous monitors. */
1736         for (it = counted; it; it = g_slist_next(it)) {
1737             RectArithmetic *ra = it->data;
1738             Rect intersection;
1739
1740             RECT_SET_INTERSECTION(intersection, ra->r, *search);
1741             if (ra->subtract) area -= RECT_AREA(intersection);
1742             else area += RECT_AREA(intersection);
1743         }
1744
1745         if (area > mostpx) {
1746             mostpx = area;
1747             mostpx_index = i;
1748         }
1749
1750         /* add the intersection rect on the current monitor I to the counted
1751            list.
1752            but now we need to compensate for every rectangle R already in the
1753            counted list, and add a new rect R' that is the intersection of
1754            R and I, but with the reverse subtraction/addition operation.
1755         */
1756         for (it = counted; it; it = g_slist_next(it)) {
1757             RectArithmetic *saved = it->data;
1758
1759             if (!RECT_INTERSECTS_RECT(saved->r, on_current_monitor))
1760                 continue;
1761             /* we are going to subtract our rect from future monitors, but
1762                part of it may already be being subtracted/added, so compensate
1763                to not double add/subtract. */
1764             RectArithmetic *reverse = g_slice_new(RectArithmetic);
1765             RECT_SET_INTERSECTION(reverse->r, saved->r, on_current_monitor);
1766             reverse->subtract = !saved->subtract;
1767             /* prepend so we can continue thru the list uninterupted */
1768             counted = g_slist_prepend(counted, reverse);
1769         }
1770         {
1771             RectArithmetic *ra = g_slice_new(RectArithmetic);
1772             ra->r = on_current_monitor;
1773             ra->subtract = TRUE;
1774             counted = g_slist_prepend(counted, ra);
1775         }
1776     }
1777
1778     while (counted) {
1779         g_slice_free(RectArithmetic, counted->data);
1780         counted = g_slist_delete_link(counted, counted);
1781     }
1782
1783     if (mostpx_index < screen_num_monitors)
1784         return mostpx_index;
1785
1786     g_assert(closest_distance_index < screen_num_monitors);
1787     return closest_distance_index;
1788 }
1789
1790 const Rect* screen_physical_area_all_monitors(void)
1791 {
1792     return screen_physical_area_monitor(screen_num_monitors);
1793 }
1794
1795 const Rect* screen_physical_area_monitor(guint head)
1796 {
1797     g_assert(head <= screen_num_monitors);
1798
1799     return &monitor_area[head];
1800 }
1801
1802 gboolean screen_physical_area_monitor_contains(guint head, Rect *search)
1803 {
1804     g_assert(head <= screen_num_monitors);
1805     g_assert(search);
1806     return RECT_INTERSECTS_RECT(monitor_area[head], *search);
1807 }
1808
1809 guint screen_monitor_active(void)
1810 {
1811     if (moveresize_client)
1812         return client_monitor(moveresize_client);
1813     else if (focus_client)
1814         return client_monitor(focus_client);
1815     else
1816         return screen_monitor_pointer();
1817 }
1818
1819 const Rect* screen_physical_area_active(void)
1820 {
1821     return screen_physical_area_monitor(screen_monitor_active());
1822 }
1823
1824 guint screen_monitor_primary(gboolean fixed)
1825 {
1826     if (config_primary_monitor_index > 0) {
1827         if (config_primary_monitor_index-1 < screen_num_monitors)
1828             return config_primary_monitor_index - 1;
1829         else
1830             return 0;
1831     }
1832     else if (fixed)
1833         return 0;
1834     else if (config_primary_monitor == OB_PLACE_MONITOR_ACTIVE)
1835         return screen_monitor_active();
1836     else /* config_primary_monitor == OB_PLACE_MONITOR_MOUSE */
1837         return screen_monitor_pointer();
1838 }
1839
1840 const Rect* screen_physical_area_primary(gboolean fixed)
1841 {
1842     return screen_physical_area_monitor(screen_monitor_primary(fixed));
1843 }
1844
1845 void screen_set_root_cursor(void)
1846 {
1847     if (sn_app_starting())
1848         XDefineCursor(obt_display, obt_root(ob_screen),
1849                       ob_cursor(OB_CURSOR_BUSYPOINTER));
1850     else
1851         XDefineCursor(obt_display, obt_root(ob_screen),
1852                       ob_cursor(OB_CURSOR_POINTER));
1853 }
1854
1855 guint screen_find_monitor_point(guint x, guint y)
1856 {
1857     Rect mon;
1858     RECT_SET(mon, x, y, 1, 1);
1859     return screen_find_monitor(&mon);
1860 }
1861
1862 guint screen_monitor_pointer()
1863 {
1864     gint x, y;
1865     if (!screen_pointer_pos(&x, &y))
1866         x = y = 0;
1867     return screen_find_monitor_point(x, y);
1868 }
1869
1870 gboolean screen_pointer_pos(gint *x, gint *y)
1871 {
1872     Window w;
1873     gint i;
1874     guint u;
1875     gboolean ret;
1876
1877     ret = !!XQueryPointer(obt_display, obt_root(ob_screen),
1878                           &w, &w, x, y, &i, &i, &u);
1879     if (!ret) {
1880         for (i = 0; i < ScreenCount(obt_display); ++i)
1881             if (i != ob_screen)
1882                 if (XQueryPointer(obt_display, obt_root(i),
1883                                   &w, &w, x, y, &i, &i, &u))
1884                     break;
1885     }
1886     return ret;
1887 }
1888
1889 gboolean screen_compare_desktops(guint a, guint b)
1890 {
1891     if (a == DESKTOP_ALL)
1892         a = screen_desktop;
1893     if (b == DESKTOP_ALL)
1894         b = screen_desktop;
1895     return a == b;
1896 }