src/fullscreen.c

   1 /*
   2  * GQview
   3  * (C) 2004 John Ellis
   4  *
   5  * Author: John Ellis
   6  *
   7  * This software is released under the GNU General Public License (GNU GPL).
   8  * Please read the included file COPYING for more information.
   9  * This software comes with no warranty of any kind, use at your own risk!
  10  */
  11
  12
  13 #include "gqview.h"
  14 #include "fullscreen.h"
  15
  16 #include "image.h"
  17 #include "ui_fileops.h"
  18 #include "ui_menu.h"
  19 #include "ui_misc.h"
  20
  21
  22 enum {
  23         FULLSCREEN_CURSOR_HIDDEN = 1 << 0,
  24         FULLSCREEN_CURSOR_NORMAL = 1 << 1,
  25         FULLSCREEN_CURSOR_BUSY   = 1 << 2
  26 };
  27
  28
  29 /*
  30  *----------------------------------------------------------------------------
  31  * full screen functions
  32  *----------------------------------------------------------------------------
  33  */
  34
  35 static void clear_mouse_cursor(GtkWidget *widget, gint state)
  36 {
  37         if (!widget->window) return;
  38
  39         if (state & FULLSCREEN_CURSOR_BUSY)
  40                 {
  41                 GdkCursor *cursor;
  42
  43                 cursor = gdk_cursor_new(GDK_WATCH);
  44                 gdk_window_set_cursor (widget->window, cursor);
  45                 gdk_cursor_unref(cursor);
  46                 }
  47         else if (state & FULLSCREEN_CURSOR_NORMAL)
  48                 {
  49                 gdk_window_set_cursor (widget->window, NULL);
  50                 }
  51         else
  52                 {
  53                 GdkCursor *cursor;
  54                 GdkPixmap *p;
  55
  56                 p = gdk_bitmap_create_from_data(widget->window, "\0\0\0", 1, 1);
  57
  58                 cursor = gdk_cursor_new_from_pixmap(p, p,
  59                                                     &widget->style->fg[GTK_STATE_ACTIVE],
  60                                                     &widget->style->bg[GTK_STATE_ACTIVE],
  61                                                     0, 0);
  62
  63                 gdk_window_set_cursor (widget->window, cursor);
  64
  65                 gdk_cursor_unref(cursor);
  66                 g_object_unref(p);
  67                 }
  68 }
  69
  70 static gint fullscreen_hide_mouse_cb(gpointer data)
  71 {
  72         FullScreenData *fs = data;
  73
  74         if (fs->hide_mouse_id == -1) return FALSE;
  75
  76         fs->cursor_state &= ~FULLSCREEN_CURSOR_NORMAL;
  77         if (!(fs->cursor_state & FULLSCREEN_CURSOR_BUSY)) clear_mouse_cursor(fs->window, fs->cursor_state);
  78
  79         fs->hide_mouse_id = -1;
  80         return FALSE;
  81 }
  82
  83 static void fullscreen_hide_mouse_disable(FullScreenData *fs)
  84 {
  85         if (fs->hide_mouse_id != -1)
  86                 {
  87                 g_source_remove(fs->hide_mouse_id);
  88                 fs->hide_mouse_id = -1;
  89                 }
  90 }
  91
  92 static void fullscreen_hide_mouse_reset(FullScreenData *fs)
  93 {
  94         fullscreen_hide_mouse_disable(fs);
  95         fs->hide_mouse_id = g_timeout_add(FULL_SCREEN_HIDE_MOUSE_DELAY, fullscreen_hide_mouse_cb, fs);
  96 }
  97
  98 static gint fullscreen_mouse_moved(GtkWidget *widget, GdkEventButton *bevent, gpointer data)
  99 {
 100         FullScreenData *fs = data;
 101
 102         if (!(fs->cursor_state & FULLSCREEN_CURSOR_NORMAL))
 103                 {
 104                 fs->cursor_state |= FULLSCREEN_CURSOR_NORMAL;
 105                 if (!(fs->cursor_state & FULLSCREEN_CURSOR_BUSY)) clear_mouse_cursor(fs->window, fs->cursor_state);
 106                 }
 107         fullscreen_hide_mouse_reset(fs);
 108
 109         return FALSE;
 110 }
 111
 112 static void fullscreen_busy_mouse_disable(FullScreenData *fs)
 113 {
 114         if (fs->busy_mouse_id != -1)
 115                 {
 116                 g_source_remove(fs->busy_mouse_id);
 117                 fs->busy_mouse_id = -1;
 118                 }
 119 }
 120
 121 static void fullscreen_mouse_set_busy(FullScreenData *fs, gint busy)
 122 {
 123         fullscreen_busy_mouse_disable(fs);
 124
 125         if ((fs->cursor_state & FULLSCREEN_CURSOR_BUSY) == (busy)) return;
 126
 127         if (busy)
 128                 {
 129                 fs->cursor_state |= FULLSCREEN_CURSOR_BUSY;
 130                 }
 131         else
 132                 {
 133                 fs->cursor_state &= ~FULLSCREEN_CURSOR_BUSY;
 134                 }
 135
 136         clear_mouse_cursor(fs->window, fs->cursor_state);
 137 }
 138
 139 static gboolean fullscreen_mouse_set_busy_cb(gpointer data)
 140 {
 141         FullScreenData *fs = data;
 142
 143         fs->busy_mouse_id = -1;
 144         fullscreen_mouse_set_busy(fs, TRUE);
 145         return FALSE;
 146 }
 147
 148 static void fullscreen_mouse_set_busy_idle(FullScreenData *fs)
 149 {
 150         if (fs->busy_mouse_id == -1)
 151                 {
 152                 fs->busy_mouse_id = g_timeout_add(FULL_SCREEN_BUSY_MOUSE_DELAY,
 153                                                   fullscreen_mouse_set_busy_cb, fs);
 154                 }
 155 }
 156
 157 static void fullscreen_image_update_cb(ImageWindow *imd, gpointer data)
 158 {
 159         FullScreenData *fs = data;
 160
 161         if (fs->imd->il &&
 162             fs->imd->il->pixbuf != image_get_pixbuf(fs->imd))
 163                 {
 164                 fullscreen_mouse_set_busy_idle(fs);
 165                 }
 166 }
 167
 168 static void fullscreen_image_complete_cb(ImageWindow *imd, gint preload, gpointer data)
 169 {
 170         FullScreenData *fs = data;
 171
 172         if (!preload) fullscreen_mouse_set_busy(fs, FALSE);
 173 }
 174
 175 #define XSCREENSAVER_BINARY     "xscreensaver-command"
 176 #define XSCREENSAVER_COMMAND    "xscreensaver-command -deactivate >&- 2>&- &"
 177
 178 static void fullscreen_saver_deactivate(void)
 179 {
 180         static gint checked = FALSE;
 181         static gint found = FALSE;
 182
 183         if (!checked)
 184                 {
 185                 checked = TRUE;
 186                 found = file_in_path(XSCREENSAVER_BINARY);
 187                 }
 188
 189         if (found)
 190                 {
 191                 system (XSCREENSAVER_COMMAND);
 192                 }
 193 }
 194
 195 static gboolean fullscreen_saver_block_cb(gpointer data)
 196 {
 197         if (fullscreen_disable_saver)
 198                 {
 199                 fullscreen_saver_deactivate();
 200                 }
 201
 202         return TRUE;
 203 }
 204
 205 static gint fullscreen_delete_cb(GtkWidget *widget, GdkEventAny *event, gpointer data)
 206 {
 207         FullScreenData *fs = data;
 208
 209         fullscreen_stop(fs);
 210         return TRUE;
 211 }
 212
 213 FullScreenData *fullscreen_start(GtkWidget *window, ImageWindow *imd,
 214                                  void (*stop_func)(FullScreenData *, gpointer), gpointer stop_data)
 215 {
 216         FullScreenData *fs;
 217         GdkScreen *screen;
 218         gint same;
 219         gint x, y;
 220         gint w, h;
 221         GdkGeometry geometry;
 222
 223         if (!window || !imd) return NULL;
 224
 225         fs = g_new0(FullScreenData, 1);
 226
 227         fs->hide_mouse_id = -1;
 228         fs->busy_mouse_id = -1;
 229         fs->cursor_state = FULLSCREEN_CURSOR_HIDDEN;
 230
 231         fs->normal_window = window;
 232         fs->normal_imd = imd;
 233
 234         fs->stop_func = stop_func;
 235         fs->stop_data = stop_data;
 236
 237         if (debug) printf("full screen requests screen %d\n", fullscreen_screen);
 238         fullscreen_prefs_get_geometry(fullscreen_screen, window, &x, &y, &w, &h,
 239                                       &screen, &same);
 240
 241         fs->window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
 242         gtk_window_set_wmclass(GTK_WINDOW(fs->window), "fullscreen", "GQview");
 243
 244         /* this requests no decorations, if you still have them complain to the window manager author(s) */
 245         gtk_window_set_decorated(GTK_WINDOW(fs->window), FALSE);
 246
 247         if (fullscreen_screen < 0)
 248                 {
 249                 /* If we want control of the window size and position this is not what we want.
 250                  * GQview needs control of which monitor(s) to use for full screen.
 251                  */
 252                 gtk_window_fullscreen(GTK_WINDOW(fs->window));
 253                 }
 254         else if (fullscreen_above)
 255                 {
 256                 /* request to be above other windows */
 257                 gtk_window_set_keep_above(GTK_WINDOW(fs->window), TRUE);
 258                 }
 259
 260         gtk_window_set_resizable(GTK_WINDOW(fs->window), FALSE);
 261
 262         gtk_window_set_screen(GTK_WINDOW(fs->window), screen);
 263         gtk_container_set_border_width(GTK_CONTAINER(fs->window), 0);
 264         g_signal_connect(G_OBJECT(fs->window), "delete_event",
 265                          G_CALLBACK(fullscreen_delete_cb), fs);
 266
 267         gtk_window_set_title(GTK_WINDOW(fs->window), _("GQview full screen"));
 268
 269         geometry.min_width = w;
 270         geometry.min_height = h;
 271         geometry.max_width = w;
 272         geometry.max_height = h;
 273         geometry.base_width = w;
 274         geometry.base_height = h;
 275         geometry.win_gravity = GDK_GRAVITY_STATIC;
 276         /* By setting USER_POS and USER_SIZE, most window managers will
 277          * not request positioning of the full screen window (for example twm).
 278          *
 279          * In addition, setting gravity to STATIC will result in the
 280          * decorations of twm to not effect the requested window position,
 281          * the decorations will simply be off screen, except in multi monitor setups :-/
 282          */
 283         gtk_window_set_geometry_hints(GTK_WINDOW(fs->window), fs->window, &geometry,
 284                                       GDK_HINT_MIN_SIZE | GDK_HINT_MAX_SIZE | GDK_HINT_BASE_SIZE |
 285                                       GDK_HINT_WIN_GRAVITY |
 286                                       GDK_HINT_USER_POS | GDK_HINT_USER_SIZE);
 287
 288         gtk_window_set_default_size(GTK_WINDOW(fs->window), w, h);
 289         gtk_window_move(GTK_WINDOW(fs->window), x, y);
 290
 291         fs->imd = image_new(FALSE);
 292
 293         gtk_container_add(GTK_CONTAINER(fs->window), fs->imd->widget);
 294
 295         /* set background to black */
 296         if (BLACK_BACKGROUND)
 297                 {
 298                 image_background_set_black(fs->imd, TRUE);
 299                 }
 300
 301         image_set_delay_flip(fs->imd, fullscreen_clean_flip);
 302         image_auto_refresh(fs->imd, fs->normal_imd->auto_refresh_interval);
 303
 304         if (fullscreen_clean_flip)
 305                 {
 306                 image_set_update_func(fs->imd, fullscreen_image_update_cb, fs);
 307                 image_set_complete_func(fs->imd, fullscreen_image_complete_cb, fs);
 308                 }
 309
 310         gtk_widget_show(fs->imd->widget);
 311
 312         image_change_from_image(fs->imd, fs->normal_imd);
 313
 314         gtk_widget_show(fs->window);
 315
 316         /* for hiding the mouse */
 317         g_signal_connect(G_OBJECT(fs->imd->pr), "motion_notify_event",
 318                            G_CALLBACK(fullscreen_mouse_moved), fs);
 319         clear_mouse_cursor(fs->window, fs->cursor_state);
 320
 321         /* set timer to block screen saver */
 322         fs->saver_block_id = g_timeout_add(60 * 1000, fullscreen_saver_block_cb, fs);
 323
 324         /* hide normal window
 325          * FIXME: properly restore this window on show
 326          */
 327 #ifdef HIDE_WINDOW_IN_FULLSCREEN
 328         gtk_widget_hide(fs->normal_window);
 329 #endif
 330         image_change_path(fs->normal_imd, NULL, image_zoom_get(fs->normal_imd));
 331
 332         return fs;
 333 }
 334
 335 void fullscreen_stop(FullScreenData *fs)
 336 {
 337         if (!fs) return;
 338
 339         g_source_remove(fs->saver_block_id);
 340
 341         fullscreen_hide_mouse_disable(fs);
 342         fullscreen_busy_mouse_disable(fs);
 343         gdk_keyboard_ungrab(GDK_CURRENT_TIME);
 344
 345         image_change_from_image(fs->normal_imd, fs->imd);
 346 #ifdef HIDE_WINDOW_IN_FULLSCREEN
 347         gtk_widget_show(fs->normal_window);
 348 #endif
 349         if (fs->stop_func) fs->stop_func(fs, fs->stop_data);
 350
 351         gtk_widget_destroy(fs->window);
 352
 353         g_free(fs);
 354 }
 355
 356
 357 /*
 358  *----------------------------------------------------------------------------
 359  * full screen preferences and utils
 360  *----------------------------------------------------------------------------
 361  */
 362
 363 GList *fullscreen_prefs_list(void)
 364 {
 365         GList *list = NULL;
 366         GdkDisplay *display;
 367         gint number;
 368         gint i;
 369
 370         display = gdk_display_get_default();
 371         number = gdk_display_get_n_screens(display);
 372
 373         for (i = 0; i < number ; i++)
 374                 {
 375                 GdkScreen *screen;
 376                 gint monitors;
 377                 gint j;
 378
 379                 screen = gdk_display_get_screen(display, i);
 380                 monitors = gdk_screen_get_n_monitors(screen);
 381
 382                 for (j = -1; j < monitors; j++)
 383                         {
 384                         ScreenData *sd;
 385                         GdkRectangle rect;
 386                         gchar *name;
 387                         gchar *subname;
 388
 389                         name = gdk_screen_make_display_name(screen);
 390
 391                         if (j < 0)
 392                                 {
 393                                 rect.x = 0;
 394                                 rect.y = 0;
 395                                 rect.width = gdk_screen_get_width(screen);
 396                                 rect.height = gdk_screen_get_height(screen);
 397                                 subname = g_strdup(_("Full size"));
 398                                 }
 399                         else
 400                                 {
 401                                 gdk_screen_get_monitor_geometry(screen, j, &rect);
 402                                 subname = g_strdup_printf("%s %d", _("Monitor"), j + 1);
 403                                 }
 404
 405                         sd = g_new0(ScreenData, 1);
 406                         sd->number = (i+1) * 100 + j + 1;
 407                         sd->description = g_strdup_printf("%s %s, %s", _("Screen"), name, subname);
 408                         sd->x = rect.x;
 409                         sd->y = rect.y;
 410                         sd->width = rect.width;
 411                         sd->height = rect.height;
 412
 413                         if (debug) printf("Screen %d %30s %4d,%4d (%4dx%4d)\n",
 414                                           sd->number, sd->description, sd->x, sd->y, sd->width, sd->height);
 415
 416                         list = g_list_append(list, sd);
 417
 418                         g_free(name);
 419                         g_free(subname);
 420                         }
 421                 }
 422
 423         return list;
 424 }
 425
 426 void fullscreen_prefs_list_free(GList *list)
 427 {
 428         GList *work;
 429
 430         work = list;
 431         while (work)
 432                 {
 433                 ScreenData *sd = work->data;
 434                 work = work->next;
 435
 436                 g_free(sd->description);
 437                 g_free(sd);
 438                 }
 439
 440         g_list_free(list);
 441 }
 442
 443 ScreenData *fullscreen_prefs_list_find(GList *list, gint screen)
 444 {
 445         GList *work;
 446
 447         work = list;
 448         while (work)
 449                 {
 450                 ScreenData *sd = work->data;
 451                 work = work->next;
 452
 453                 if (sd->number == screen) return sd;
 454                 }
 455
 456         return NULL;
 457 }
 458
 459 /* screen is interpreted as such:
 460  *  -1  window manager determines size and position, fallback is (1) active monitor
 461  *   0  full size of screen containing widget
 462  *   1  size of monitor containing widget
 463  * 100  full size of screen 1 (screen, monitor counts start at 1)
 464  * 101  size of monitor 1 on screen 1
 465  * 203  size of monitor 3 on screen 2
 466  * returns:
 467  * dest_screen: screen to place widget [use gtk_window_set_screen()]
 468  * same_region: the returned region will overlap the current location of widget.
 469  */
 470 void fullscreen_prefs_get_geometry(gint screen, GtkWidget *widget, gint *x, gint *y, gint *width, gint *height,
 471                                    GdkScreen **dest_screen, gint *same_region)
 472 {
 473         GList *list;
 474         ScreenData *sd;
 475
 476         list = fullscreen_prefs_list();
 477         if (screen >= 100)
 478                 {
 479                 sd = fullscreen_prefs_list_find(list, screen);
 480                 }
 481         else
 482                 {
 483                 sd = NULL;
 484                 if (screen < 0) screen = 1;
 485                 }
 486
 487         if (sd)
 488                 {
 489                 GdkDisplay *display;
 490                 GdkScreen *screen;
 491                 gint n;
 492
 493                 display = gdk_display_get_default();
 494                 n = sd->number / 100 - 1;
 495                 if (n >= 0 && n < gdk_display_get_n_screens(display))
 496                         {
 497                         screen = gdk_display_get_screen(display, n);
 498                         }
 499                 else
 500                         {
 501                         screen = gdk_display_get_default_screen(display);
 502                         }
 503
 504                 if (x) *x = sd->x;
 505                 if (y) *y = sd->y;
 506                 if (width) *width = sd->width;
 507                 if (height) *height = sd->height;
 508
 509                 if (dest_screen) *dest_screen = screen;
 510                 if (same_region) *same_region = (!widget || !widget->window ||
 511                                         (screen == gtk_widget_get_screen(widget) &&
 512                                         (sd->number%100 == 0 ||
 513                                          sd->number%100 == gdk_screen_get_monitor_at_window(screen, widget->window)+1)));
 514
 515                 }
 516         else if (screen != 1 || !widget || !widget->window)
 517                 {
 518                 GdkScreen *screen;
 519
 520                 if (widget)
 521                         {
 522                         screen = gtk_widget_get_screen(widget);
 523                         }
 524                 else
 525                         {
 526                         screen = gdk_screen_get_default();
 527                         }
 528
 529                 if (x) *x = 0;
 530                 if (y) *y = 0;
 531                 if (width) *width = gdk_screen_get_width(screen);
 532                 if (height) *height = gdk_screen_get_height(screen);
 533
 534                 if (dest_screen) *dest_screen = screen;
 535                 if (same_region) *same_region = TRUE;
 536                 }
 537         else
 538                 {
 539                 GdkScreen *screen;
 540                 gint monitor;
 541                 GdkRectangle rect;
 542
 543                 screen = gtk_widget_get_screen(widget);
 544                 monitor = gdk_screen_get_monitor_at_window(screen, widget->window);
 545
 546                 gdk_screen_get_monitor_geometry(screen, monitor, &rect);
 547
 548                 if (x) *x = rect.x;
 549                 if (y) *y = rect.y;
 550                 if (width) *width = rect.width;
 551                 if (height) *height = rect.height;
 552
 553                 if (dest_screen) *dest_screen = screen;
 554                 if (same_region) *same_region = TRUE;
 555                 }
 556
 557         fullscreen_prefs_list_free(list);
 558 }
 559
 560 gint fullscreen_prefs_find_screen_for_widget(GtkWidget *widget)
 561 {
 562         GdkScreen *screen;
 563         gint monitor;
 564         gint n;
 565
 566         if (!widget || !widget->window) return 0;
 567
 568         screen = gtk_widget_get_screen(widget);
 569         monitor = gdk_screen_get_monitor_at_window(screen, widget->window);
 570
 571         n = (gdk_screen_get_number(screen)+1) * 100 + monitor + 1;
 572
 573         if (debug || TRUE) printf("Screen appears to be %d\n", n);
 574
 575         return n;
 576 }
 577
 578 enum {
 579         FS_MENU_COLUMN_NAME = 0,
 580         FS_MENU_COLUMN_VALUE
 581 };
 582
 583 #define BUTTON_ABOVE_KEY  "button_above"
 584
 585 static void fullscreen_prefs_selection_cb(GtkWidget *combo, gpointer data)
 586 {
 587         gint *value = data;
 588         GtkTreeModel *store;
 589         GtkTreeIter iter;
 590         GtkWidget *button;
 591
 592         if (!value) return;
 593
 594         store = gtk_combo_box_get_model(GTK_COMBO_BOX(combo));
 595         if (!gtk_combo_box_get_active_iter(GTK_COMBO_BOX(combo), &iter)) return;
 596         gtk_tree_model_get(store, &iter, FS_MENU_COLUMN_VALUE, value, -1);
 597
 598         button = g_object_get_data(G_OBJECT(combo), BUTTON_ABOVE_KEY);
 599         if (button)
 600                 {
 601                 gtk_widget_set_sensitive(button, *value != -1);
 602                 }
 603 }
 604
 605 static void fullscreen_prefs_selection_add(GtkListStore *store, const gchar *text, gint value)
 606 {
 607         GtkTreeIter iter;
 608
 609         gtk_list_store_append(store, &iter);
 610         gtk_list_store_set(store, &iter, FS_MENU_COLUMN_NAME, text,
 611                                          FS_MENU_COLUMN_VALUE, value, -1);
 612 }
 613
 614 GtkWidget *fullscreen_prefs_selection_new(const gchar *text, gint *screen_value, gint *above_value)
 615 {
 616         GtkWidget *vbox;
 617         GtkWidget *hbox;
 618         GtkWidget *combo;
 619         GtkListStore *store;
 620         GtkCellRenderer *renderer;
 621         GtkWidget *button = NULL;
 622         GList *list;
 623         GList *work;
 624         gint current = 0;
 625         gint n;
 626
 627         if (!screen_value) return NULL;
 628
 629         vbox = gtk_vbox_new(FALSE, PREF_PAD_GAP);
 630         hbox = pref_box_new(vbox, FALSE, GTK_ORIENTATION_HORIZONTAL, PREF_PAD_SPACE);
 631         if (text) pref_label_new(hbox, text);
 632
 633         store = gtk_list_store_new(2, G_TYPE_STRING, G_TYPE_INT);
 634         combo = gtk_combo_box_new_with_model(GTK_TREE_MODEL(store));
 635         g_object_unref(store);
 636
 637         renderer = gtk_cell_renderer_text_new();
 638         gtk_cell_layout_pack_start(GTK_CELL_LAYOUT(combo), renderer, TRUE);
 639         gtk_cell_layout_set_attributes(GTK_CELL_LAYOUT(combo), renderer,
 640                                        "text", FS_MENU_COLUMN_NAME, NULL);
 641
 642         if (above_value)
 643                 {
 644                 button = pref_checkbox_new_int(vbox, _("Stay above other windows"),
 645                                                *above_value, above_value);
 646                 gtk_widget_set_sensitive(button, *screen_value != -1);
 647
 648                 g_object_set_data(G_OBJECT(combo), BUTTON_ABOVE_KEY, button);
 649                 }
 650
 651         fullscreen_prefs_selection_add(store, _("Determined by Window Manager"), -1);
 652         fullscreen_prefs_selection_add(store, _("Active screen"), 0);
 653         if (*screen_value == 0) current = 1;
 654         fullscreen_prefs_selection_add(store, _("Active monitor"), 1);
 655         if (*screen_value == 1) current = 2;
 656
 657         n = 3;
 658         list = fullscreen_prefs_list();
 659         work = list;
 660         while (work)
 661                 {
 662                 ScreenData *sd = work->data;
 663
 664                 fullscreen_prefs_selection_add(store, sd->description, sd->number);
 665                 if (*screen_value == sd->number) current = n;
 666
 667                 work = work->next;
 668                 n++;
 669                 }
 670         fullscreen_prefs_list_free(list);
 671
 672         gtk_combo_box_set_active(GTK_COMBO_BOX(combo), current);
 673
 674         gtk_box_pack_start(GTK_BOX(hbox), combo, FALSE, FALSE, 0);
 675         gtk_widget_show(combo);
 676
 677         g_signal_connect(G_OBJECT(combo), "changed",
 678                          G_CALLBACK(fullscreen_prefs_selection_cb), screen_value);
 679
 680         return vbox;
 681 }
 682