1 /* GDK - The GIMP Drawing Kit
4 * Copyright 2001 Sun Microsystems Inc.
6 * Erwann Chenede <erwann.chenede@sun.com>
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
26 #include "gdkdisplay.h"
27 #include "gdkdisplayprivate.h"
29 #include "gdkdeviceprivate.h"
30 #include "gdkevents.h"
31 #include "gdkwindowimpl.h"
32 #include "gdkinternals.h"
33 #include "gdkmarshalers.h"
34 #include "gdkscreen.h"
41 * @Short_description: Controls a set of GdkScreens and their associated input devices
44 * #GdkDisplay objects purpose are two fold:
47 * To manage and provide information about input devices (pointers
51 * To manage and provide information about the available #GdkScreens
55 * GdkDisplay objects are the GDK representation of an X Display,
56 * which can be described as <emphasis>a workstation consisting of
57 * a keyboard, a pointing device (such as a mouse) and one or more
59 * It is used to open and keep track of various GdkScreen objects
60 * currently instantiated by the application. It is also used to
61 * access the keyboard(s) and mouse pointer(s) of the display.
63 * Most of the input device handling has been factored out into
64 * the separate #GdkDeviceManager object. Every display has a
65 * device manager, which you can obtain using
66 * gdk_display_get_device_manager().
76 static void gdk_display_dispose (GObject *object);
77 static void gdk_display_finalize (GObject *object);
80 static GdkAppLaunchContext *gdk_display_real_get_app_launch_context (GdkDisplay *display);
82 static guint signals[LAST_SIGNAL] = { 0 };
84 G_DEFINE_TYPE (GdkDisplay, gdk_display, G_TYPE_OBJECT)
87 gdk_display_class_init (GdkDisplayClass *class)
89 GObjectClass *object_class = G_OBJECT_CLASS (class);
91 object_class->finalize = gdk_display_finalize;
92 object_class->dispose = gdk_display_dispose;
94 class->get_app_launch_context = gdk_display_real_get_app_launch_context;
95 class->window_type = GDK_TYPE_WINDOW;
99 * @display: the object on which the signal is emitted
101 * The ::opened signal is emitted when the connection to the windowing
102 * system for @display is opened.
105 g_signal_new (g_intern_static_string ("opened"),
106 G_OBJECT_CLASS_TYPE (object_class),
109 g_cclosure_marshal_VOID__VOID,
113 * GdkDisplay::closed:
114 * @display: the object on which the signal is emitted
115 * @is_error: %TRUE if the display was closed due to an error
117 * The ::closed signal is emitted when the connection to the windowing
118 * system for @display is closed.
123 g_signal_new (g_intern_static_string ("closed"),
124 G_OBJECT_CLASS_TYPE (object_class),
126 G_STRUCT_OFFSET (GdkDisplayClass, closed),
128 _gdk_marshal_VOID__BOOLEAN,
135 free_pointer_info (GdkPointerWindowInfo *info)
137 g_object_unref (info->toplevel_under_pointer);
138 g_slice_free (GdkPointerWindowInfo, info);
142 free_device_grab (GdkDeviceGrabInfo *info)
144 g_object_unref (info->window);
145 g_object_unref (info->native_window);
150 free_device_grabs_foreach (gpointer key,
156 g_list_foreach (list, (GFunc) free_device_grab, NULL);
163 device_removed_cb (GdkDeviceManager *device_manager,
167 g_hash_table_remove (display->multiple_click_info, device);
168 g_hash_table_remove (display->device_grabs, device);
169 g_hash_table_remove (display->pointers_info, device);
171 /* FIXME: change core pointer and remove from device list */
175 gdk_display_opened (GdkDisplay *display)
177 GdkDeviceManager *device_manager;
179 device_manager = gdk_display_get_device_manager (display);
181 g_signal_connect (device_manager, "device-removed",
182 G_CALLBACK (device_removed_cb), display);
186 gdk_display_init (GdkDisplay *display)
188 display->double_click_time = 250;
189 display->double_click_distance = 5;
191 display->device_grabs = g_hash_table_new (NULL, NULL);
192 display->motion_hint_info = g_hash_table_new_full (NULL, NULL, NULL,
193 (GDestroyNotify) g_free);
195 display->pointers_info = g_hash_table_new_full (NULL, NULL, NULL,
196 (GDestroyNotify) free_pointer_info);
198 display->multiple_click_info = g_hash_table_new_full (NULL, NULL, NULL,
199 (GDestroyNotify) g_free);
201 g_signal_connect (display, "opened",
202 G_CALLBACK (gdk_display_opened), NULL);
206 gdk_display_dispose (GObject *object)
208 GdkDisplay *display = GDK_DISPLAY (object);
209 GdkDeviceManager *device_manager;
211 device_manager = gdk_display_get_device_manager (GDK_DISPLAY (object));
213 g_list_foreach (display->queued_events, (GFunc)gdk_event_free, NULL);
214 g_list_free (display->queued_events);
215 display->queued_events = NULL;
216 display->queued_tail = NULL;
220 /* this is to make it drop devices which may require using the X
221 * display and therefore can't be cleaned up in finalize.
222 * It will also disconnect device_removed_cb
224 g_object_run_dispose (G_OBJECT (display->device_manager));
227 G_OBJECT_CLASS (gdk_display_parent_class)->dispose (object);
231 gdk_display_finalize (GObject *object)
233 GdkDisplay *display = GDK_DISPLAY (object);
235 g_hash_table_foreach_remove (display->device_grabs,
236 free_device_grabs_foreach,
238 g_hash_table_destroy (display->device_grabs);
240 g_hash_table_destroy (display->pointers_info);
241 g_hash_table_destroy (display->multiple_click_info);
243 if (display->device_manager)
244 g_object_unref (display->device_manager);
246 G_OBJECT_CLASS (gdk_display_parent_class)->finalize (object);
251 * @display: a #GdkDisplay
253 * Closes the connection to the windowing system for the given display,
254 * and cleans up associated resources.
259 gdk_display_close (GdkDisplay *display)
261 g_return_if_fail (GDK_IS_DISPLAY (display));
263 if (!display->closed)
265 display->closed = TRUE;
267 g_signal_emit (display, signals[CLOSED], 0, FALSE);
268 g_object_run_dispose (G_OBJECT (display));
270 g_object_unref (display);
275 * gdk_display_is_closed:
276 * @display: a #GdkDisplay
278 * Finds out if the display has been closed.
280 * Returns: %TRUE if the display is closed.
285 gdk_display_is_closed (GdkDisplay *display)
287 g_return_val_if_fail (GDK_IS_DISPLAY (display), FALSE);
289 return display->closed;
293 * gdk_display_get_event:
294 * @display: a #GdkDisplay
296 * Gets the next #GdkEvent to be processed for @display, fetching events from the
297 * windowing system if necessary.
299 * Return value: the next #GdkEvent to be processed, or %NULL if no events
300 * are pending. The returned #GdkEvent should be freed with gdk_event_free().
305 gdk_display_get_event (GdkDisplay *display)
307 g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
309 GDK_DISPLAY_GET_CLASS (display)->queue_events (display);
310 return _gdk_event_unqueue (display);
314 * gdk_display_peek_event:
315 * @display: a #GdkDisplay
317 * Gets a copy of the first #GdkEvent in the @display's event queue, without
318 * removing the event from the queue. (Note that this function will
319 * not get more events from the windowing system. It only checks the events
320 * that have already been moved to the GDK event queue.)
322 * Return value: a copy of the first #GdkEvent on the event queue, or %NULL
323 * if no events are in the queue. The returned #GdkEvent should be freed with
329 gdk_display_peek_event (GdkDisplay *display)
333 g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
335 tmp_list = _gdk_event_queue_find_first (display);
338 return gdk_event_copy (tmp_list->data);
344 * gdk_display_put_event:
345 * @display: a #GdkDisplay
346 * @event: a #GdkEvent.
348 * Appends a copy of the given event onto the front of the event
349 * queue for @display.
354 gdk_display_put_event (GdkDisplay *display,
355 const GdkEvent *event)
357 g_return_if_fail (GDK_IS_DISPLAY (display));
358 g_return_if_fail (event != NULL);
360 _gdk_event_queue_append (display, gdk_event_copy (event));
361 /* If the main loop is blocking in a different thread, wake it up */
362 g_main_context_wakeup (NULL);
366 * gdk_display_pointer_ungrab:
367 * @display: a #GdkDisplay.
368 * @time_: a timestap (e.g. %GDK_CURRENT_TIME).
370 * Release any pointer grab.
374 * Deprecated: 3.0: Use gdk_device_ungrab(), together with gdk_device_grab()
378 gdk_display_pointer_ungrab (GdkDisplay *display,
381 GdkDeviceManager *device_manager;
382 GList *devices, *dev;
385 g_return_if_fail (GDK_IS_DISPLAY (display));
387 device_manager = gdk_display_get_device_manager (display);
388 devices = gdk_device_manager_list_devices (device_manager, GDK_DEVICE_TYPE_MASTER);
390 /* FIXME: Should this be generic to all backends? */
391 /* FIXME: What happens with extended devices? */
392 for (dev = devices; dev; dev = dev->next)
396 if (gdk_device_get_source (device) != GDK_SOURCE_MOUSE)
399 gdk_device_ungrab (device, time_);
402 g_list_free (devices);
406 * gdk_pointer_ungrab:
407 * @time_: a timestamp from a #GdkEvent, or %GDK_CURRENT_TIME if no
408 * timestamp is available.
410 * Ungrabs the pointer on the default display, if it is grabbed by this
413 * Deprecated: 3.0: Use gdk_device_ungrab(), together with gdk_device_grab()
417 gdk_pointer_ungrab (guint32 time)
419 gdk_display_pointer_ungrab (gdk_display_get_default (), time);
423 * gdk_pointer_is_grabbed:
425 * Returns %TRUE if the pointer on the default display is currently
426 * grabbed by this application.
428 * Note that this does not take the inmplicit pointer grab on button
429 * presses into account.
431 * Return value: %TRUE if the pointer is currently grabbed by this application.
433 * Deprecated: 3.0: Use gdk_display_device_is_grabbed() instead.
436 gdk_pointer_is_grabbed (void)
438 return gdk_display_pointer_is_grabbed (gdk_display_get_default ());
442 * gdk_display_keyboard_ungrab:
443 * @display: a #GdkDisplay.
444 * @time_: a timestap (e.g #GDK_CURRENT_TIME).
446 * Release any keyboard grab
450 * Deprecated: 3.0: Use gdk_device_ungrab(), together with gdk_device_grab()
454 gdk_display_keyboard_ungrab (GdkDisplay *display,
457 GdkDeviceManager *device_manager;
458 GList *devices, *dev;
461 g_return_if_fail (GDK_IS_DISPLAY (display));
463 device_manager = gdk_display_get_device_manager (display);
464 devices = gdk_device_manager_list_devices (device_manager, GDK_DEVICE_TYPE_MASTER);
466 /* FIXME: Should this be generic to all backends? */
467 /* FIXME: What happens with extended devices? */
468 for (dev = devices; dev; dev = dev->next)
472 if (gdk_device_get_source (device) != GDK_SOURCE_KEYBOARD)
475 gdk_device_ungrab (device, time);
478 g_list_free (devices);
482 * gdk_keyboard_ungrab:
483 * @time_: a timestamp from a #GdkEvent, or %GDK_CURRENT_TIME if no
484 * timestamp is available.
486 * Ungrabs the keyboard on the default display, if it is grabbed by this
489 * Deprecated: 3.0: Use gdk_device_ungrab(), together with gdk_device_grab()
493 gdk_keyboard_ungrab (guint32 time)
495 gdk_display_keyboard_ungrab (gdk_display_get_default (), time);
501 * Emits a short beep on the default display.
506 gdk_display_beep (gdk_display_get_default ());
512 * Flushes the output buffers of all display connections and waits
513 * until all requests have been processed.
514 * This is rarely needed by applications.
521 list = gdk_display_manager_list_displays (gdk_display_manager_get ());
522 for (l = list; l; l = l->next)
524 GdkDisplay *display = l->data;
526 GDK_DISPLAY_GET_CLASS (display)->sync (display);
533 _gdk_display_enable_motion_hints (GdkDisplay *display,
536 gulong *device_serial, serial;
538 device_serial = g_hash_table_lookup (display->motion_hint_info, device);
542 device_serial = g_new0 (gulong, 1);
543 *device_serial = G_MAXULONG;
544 g_hash_table_insert (display->motion_hint_info, device, device_serial);
547 if (*device_serial != 0)
549 serial = _gdk_display_get_next_serial (display);
550 /* We might not actually generate the next request, so
551 make sure this triggers always, this may cause it to
552 trigger slightly too early, but this is just a hint
556 if (serial < *device_serial)
557 *device_serial = serial;
562 * gdk_display_get_pointer:
563 * @display: a #GdkDisplay
564 * @screen: (out) (allow-none): location to store the screen that the
565 * cursor is on, or %NULL.
566 * @x: (out) (allow-none): location to store root window X coordinate of pointer, or %NULL.
567 * @y: (out) (allow-none): location to store root window Y coordinate of pointer, or %NULL.
568 * @mask: (out) (allow-none): location to store current modifier mask, or %NULL
570 * Gets the current location of the pointer and the current modifier
571 * mask for a given display.
575 * Deprecated: 3.0: Use gdk_device_get_position() instead.
578 gdk_display_get_pointer (GdkDisplay *display,
582 GdkModifierType *mask)
584 GdkScreen *default_screen;
587 GdkModifierType tmp_mask;
589 g_return_if_fail (GDK_IS_DISPLAY (display));
591 if (gdk_display_is_closed (display))
594 default_screen = gdk_display_get_default_screen (display);
596 /* We call _gdk_device_query_state() here manually instead of
597 * gdk_device_get_position() because we care about the modifier mask */
599 _gdk_device_query_state (display->core_pointer,
600 gdk_screen_get_root_window (default_screen),
607 *screen = gdk_window_get_screen (root);
617 * gdk_display_get_window_at_pointer:
618 * @display: a #GdkDisplay
619 * @win_x: (out) (allow-none): return location for x coordinate of the pointer location relative
620 * to the window origin, or %NULL
621 * @win_y: (out) (allow-none): return location for y coordinate of the pointer location relative
622 & to the window origin, or %NULL
624 * Obtains the window underneath the mouse pointer, returning the location
625 * of the pointer in that window in @win_x, @win_y for @screen. Returns %NULL
626 * if the window under the mouse pointer is not known to GDK (for example,
627 * belongs to another application).
629 * Returns: (transfer none): the window under the mouse pointer, or %NULL
633 * Deprecated: 3.0: Use gdk_device_get_window_at_position() instead.
636 gdk_display_get_window_at_pointer (GdkDisplay *display,
640 g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
642 return gdk_device_get_window_at_position (display->core_pointer, win_x, win_y);
646 generate_grab_broken_event (GdkWindow *window,
649 GdkWindow *grab_window)
651 g_return_if_fail (window != NULL);
653 if (!GDK_WINDOW_DESTROYED (window))
657 event = gdk_event_new (GDK_GRAB_BROKEN);
658 event->grab_broken.window = g_object_ref (window);
659 event->grab_broken.send_event = FALSE;
660 event->grab_broken.implicit = implicit;
661 event->grab_broken.grab_window = grab_window;
662 gdk_event_set_device (event, device);
663 event->grab_broken.keyboard = (gdk_device_get_source (device) == GDK_SOURCE_KEYBOARD) ? TRUE : FALSE;
665 gdk_event_put (event);
666 gdk_event_free (event);
671 _gdk_display_get_last_device_grab (GdkDisplay *display,
676 l = g_hash_table_lookup (display->device_grabs, device);
688 _gdk_display_add_device_grab (GdkDisplay *display,
691 GdkWindow *native_window,
692 GdkGrabOwnership grab_ownership,
693 gboolean owner_events,
694 GdkEventMask event_mask,
695 unsigned long serial_start,
699 GdkDeviceGrabInfo *info, *other_info;
702 info = g_new0 (GdkDeviceGrabInfo, 1);
704 info->window = g_object_ref (window);
705 info->native_window = g_object_ref (native_window);
706 info->serial_start = serial_start;
707 info->serial_end = G_MAXULONG;
708 info->owner_events = owner_events;
709 info->event_mask = event_mask;
711 info->implicit = implicit;
712 info->ownership = grab_ownership;
714 grabs = g_hash_table_lookup (display->device_grabs, device);
716 /* Find the first grab that has a larger start time (if any) and insert
717 * before that. I.E we insert after already existing grabs with same
719 for (l = grabs; l != NULL; l = l->next)
721 other_info = l->data;
723 if (info->serial_start < other_info->serial_start)
727 grabs = g_list_insert_before (grabs, l, info);
729 /* Make sure the new grab end before next grab */
732 other_info = l->data;
733 info->serial_end = other_info->serial_start;
736 /* Find any previous grab and update its end time */
737 l = g_list_find (grabs, info);
741 other_info = l->data;
742 other_info->serial_end = serial_start;
745 g_hash_table_insert (display->device_grabs, device, grabs);
750 /* _gdk_synthesize_crossing_events only works inside one toplevel.
751 This function splits things into two calls if needed, converting the
752 coordinates to the right toplevel */
754 synthesize_crossing_events (GdkDisplay *display,
756 GdkDevice *source_device,
757 GdkWindow *src_window,
758 GdkWindow *dest_window,
759 GdkCrossingMode crossing_mode,
763 GdkWindow *src_toplevel, *dest_toplevel;
764 GdkModifierType state;
767 /* We use the native crossing events if all native */
768 if (_gdk_native_windows)
772 src_toplevel = gdk_window_get_toplevel (src_window);
776 dest_toplevel = gdk_window_get_toplevel (dest_window);
778 dest_toplevel = NULL;
780 if (src_toplevel == NULL && dest_toplevel == NULL)
783 if (src_toplevel == NULL ||
784 src_toplevel == dest_toplevel)
787 gdk_window_get_pointer (dest_toplevel,
789 _gdk_synthesize_crossing_events (display,
792 device, source_device,
799 else if (dest_toplevel == NULL)
801 gdk_window_get_pointer (src_toplevel,
803 _gdk_synthesize_crossing_events (display,
806 device, source_device,
815 /* Different toplevels */
816 gdk_window_get_pointer (src_toplevel,
818 _gdk_synthesize_crossing_events (display,
821 device, source_device,
827 gdk_window_get_pointer (dest_toplevel,
829 _gdk_synthesize_crossing_events (display,
832 device, source_device,
842 get_current_toplevel (GdkDisplay *display,
846 GdkModifierType *state_out)
848 GdkWindow *pointer_window;
850 GdkModifierType state;
852 pointer_window = _gdk_device_window_at_position (device, &x, &y, &state, TRUE);
854 if (pointer_window != NULL &&
855 (GDK_WINDOW_DESTROYED (pointer_window) ||
856 GDK_WINDOW_TYPE (pointer_window) == GDK_WINDOW_ROOT ||
857 GDK_WINDOW_TYPE (pointer_window) == GDK_WINDOW_FOREIGN))
858 pointer_window = NULL;
864 return pointer_window;
868 switch_to_pointer_grab (GdkDisplay *display,
870 GdkDevice *source_device,
871 GdkDeviceGrabInfo *grab,
872 GdkDeviceGrabInfo *last_grab,
876 GdkWindow *src_window, *pointer_window, *new_toplevel;
877 GdkPointerWindowInfo *info;
879 GdkModifierType state;
882 /* Temporarily unset pointer to make sure we send the crossing events below */
883 old_grabs = g_hash_table_lookup (display->device_grabs, device);
884 g_hash_table_steal (display->device_grabs, device);
885 info = _gdk_display_get_pointer_info (display, device);
889 /* New grab is in effect */
891 /* We need to generate crossing events for the grab.
892 * However, there are never any crossing events for implicit grabs
893 * TODO: ... Actually, this could happen if the pointer window
894 * doesn't have button mask so a parent gets the event...
898 /* We send GRAB crossing events from the window under the pointer to the
899 grab window. Except if there is an old grab then we start from that */
901 src_window = last_grab->window;
903 src_window = info->window_under_pointer;
905 if (src_window != grab->window)
906 synthesize_crossing_events (display, device, source_device,
907 src_window, grab->window,
908 GDK_CROSSING_GRAB, time, serial);
910 /* !owner_event Grabbing a window that we're not inside, current status is
911 now NULL (i.e. outside grabbed window) */
912 if (!grab->owner_events && info->window_under_pointer != grab->window)
913 _gdk_display_set_window_under_pointer (display, device, NULL);
916 grab->activated = TRUE;
923 if (grab == NULL /* ungrab */ ||
924 (!last_grab->owner_events && grab->owner_events) /* switched to owner_events */ )
926 /* We force check what window we're in, and update the toplevel_under_pointer info,
927 * as that won't get told of this change with toplevel enter events.
929 if (info->toplevel_under_pointer)
930 g_object_unref (info->toplevel_under_pointer);
931 info->toplevel_under_pointer = NULL;
933 /* Ungrabbed slave devices don't have a position by
934 * itself, rather depend on its master pointer, so
935 * it doesn't make sense to track any position for
936 * these after the grab
938 if (grab || gdk_device_get_device_type (device) != GDK_DEVICE_TYPE_SLAVE)
939 new_toplevel = get_current_toplevel (display, device, &x, &y, &state);
943 /* w is now toplevel and x,y in toplevel coords */
944 info->toplevel_under_pointer = g_object_ref (new_toplevel);
945 info->toplevel_x = x;
946 info->toplevel_y = y;
951 if (grab == NULL) /* Ungrabbed, send events */
953 pointer_window = NULL;
956 /* Find (possibly virtual) child window */
958 _gdk_window_find_descendant_at (new_toplevel,
963 if (pointer_window != last_grab->window)
964 synthesize_crossing_events (display, device, source_device,
965 last_grab->window, pointer_window,
966 GDK_CROSSING_UNGRAB, time, serial);
968 /* We're now ungrabbed, update the window_under_pointer */
969 _gdk_display_set_window_under_pointer (display, device, pointer_window);
973 g_hash_table_insert (display->device_grabs, device, old_grabs);
977 _gdk_display_device_grab_update (GdkDisplay *display,
979 GdkDevice *source_device,
980 gulong current_serial)
982 GdkDeviceGrabInfo *current_grab, *next_grab;
986 time = display->last_event_time;
987 grabs = g_hash_table_lookup (display->device_grabs, device);
989 while (grabs != NULL)
991 current_grab = grabs->data;
993 if (current_grab->serial_start > current_serial)
994 return; /* Hasn't started yet */
996 if (current_grab->serial_end > current_serial)
998 /* This one hasn't ended yet.
999 its the currently active one or scheduled to be active */
1001 if (!current_grab->activated)
1003 if (gdk_device_get_source (device) != GDK_SOURCE_KEYBOARD)
1004 switch_to_pointer_grab (display, device, source_device, current_grab, NULL, time, current_serial);
1013 /* This is the next active grab */
1014 next_grab = grabs->next->data;
1016 if (next_grab->serial_start > current_serial)
1017 next_grab = NULL; /* Actually its not yet active */
1020 if ((next_grab == NULL && current_grab->implicit_ungrab) ||
1021 (next_grab != NULL && current_grab->window != next_grab->window))
1022 generate_grab_broken_event (GDK_WINDOW (current_grab->window),
1024 current_grab->implicit,
1025 next_grab? next_grab->window : NULL);
1027 /* Remove old grab */
1028 grabs = g_list_delete_link (grabs, grabs);
1029 g_hash_table_insert (display->device_grabs, device, grabs);
1031 if (gdk_device_get_source (device) != GDK_SOURCE_KEYBOARD)
1032 switch_to_pointer_grab (display, device, source_device,
1033 next_grab, current_grab,
1034 time, current_serial);
1036 free_device_grab (current_grab);
1041 grab_list_find (GList *grabs,
1044 GdkDeviceGrabInfo *grab;
1050 if (serial >= grab->serial_start && serial < grab->serial_end)
1053 grabs = grabs->next;
1060 find_device_grab (GdkDisplay *display,
1066 l = g_hash_table_lookup (display->device_grabs, device);
1067 return grab_list_find (l, serial);
1071 _gdk_display_has_device_grab (GdkDisplay *display,
1077 l = find_device_grab (display, device, serial);
1084 /* Returns true if last grab was ended
1085 * If if_child is non-NULL, end the grab only if the grabbed
1086 * window is the same as if_child or a descendant of it */
1088 _gdk_display_end_device_grab (GdkDisplay *display,
1091 GdkWindow *if_child,
1094 GdkDeviceGrabInfo *grab;
1097 l = find_device_grab (display, device, serial);
1104 (if_child == NULL ||
1105 _gdk_window_event_parent_of (if_child, grab->window)))
1107 grab->serial_end = serial;
1108 grab->implicit_ungrab = implicit;
1109 return l->next == NULL;
1115 /* Returns TRUE if device events are not blocked by any grab */
1117 _gdk_display_check_grab_ownership (GdkDisplay *display,
1121 GHashTableIter iter;
1122 gpointer key, value;
1123 GdkGrabOwnership higher_ownership, device_ownership;
1124 gboolean device_is_keyboard;
1126 g_hash_table_iter_init (&iter, display->device_grabs);
1127 higher_ownership = device_ownership = GDK_OWNERSHIP_NONE;
1128 device_is_keyboard = (gdk_device_get_source (device) == GDK_SOURCE_KEYBOARD);
1130 while (g_hash_table_iter_next (&iter, &key, &value))
1132 GdkDeviceGrabInfo *grab;
1138 grabs = grab_list_find (grabs, serial);
1143 /* Discard device if it's not of the same type */
1144 if ((device_is_keyboard && gdk_device_get_source (dev) != GDK_SOURCE_KEYBOARD) ||
1145 (!device_is_keyboard && gdk_device_get_source (dev) == GDK_SOURCE_KEYBOARD))
1151 device_ownership = grab->ownership;
1154 if (grab->ownership > higher_ownership)
1155 higher_ownership = grab->ownership;
1159 if (higher_ownership > device_ownership)
1161 /* There's a higher priority ownership
1162 * going on for other device(s)
1170 GdkPointerWindowInfo *
1171 _gdk_display_get_pointer_info (GdkDisplay *display,
1174 GdkPointerWindowInfo *info;
1176 if (G_UNLIKELY (!device))
1179 info = g_hash_table_lookup (display->pointers_info, device);
1181 if (G_UNLIKELY (!info))
1183 info = g_slice_new0 (GdkPointerWindowInfo);
1184 g_hash_table_insert (display->pointers_info, device, info);
1191 _gdk_display_pointer_info_foreach (GdkDisplay *display,
1192 GdkDisplayPointerInfoForeach func,
1195 GHashTableIter iter;
1196 gpointer key, value;
1198 g_hash_table_iter_init (&iter, display->pointers_info);
1200 while (g_hash_table_iter_next (&iter, &key, &value))
1202 GdkPointerWindowInfo *info = value;
1203 GdkDevice *device = key;
1205 (func) (display, device, info, user_data);
1210 * gdk_device_grab_info_libgtk_only:
1211 * @display: the display for which to get the grab information
1212 * @device: device to get the grab information from
1213 * @grab_window: (out) (transfer none): location to store current grab window
1214 * @owner_events: (out): location to store boolean indicating whether
1215 * the @owner_events flag to gdk_keyboard_grab() or
1216 * gdk_pointer_grab() was %TRUE.
1218 * Determines information about the current keyboard grab.
1219 * This is not public API and must not be used by applications.
1221 * Return value: %TRUE if this application currently has the
1225 gdk_device_grab_info_libgtk_only (GdkDisplay *display,
1227 GdkWindow **grab_window,
1228 gboolean *owner_events)
1230 GdkDeviceGrabInfo *info;
1232 g_return_val_if_fail (GDK_IS_DISPLAY (display), FALSE);
1233 g_return_val_if_fail (GDK_IS_DEVICE (device), FALSE);
1235 info = _gdk_display_get_last_device_grab (display, device);
1240 *grab_window = info->window;
1242 *owner_events = info->owner_events;
1251 * gdk_display_pointer_is_grabbed:
1252 * @display: a #GdkDisplay
1254 * Test if the pointer is grabbed.
1256 * Returns: %TRUE if an active X pointer grab is in effect
1260 * Deprecated: 3.0: Use gdk_display_device_is_grabbed() instead.
1263 gdk_display_pointer_is_grabbed (GdkDisplay *display)
1265 GdkDeviceManager *device_manager;
1266 GList *devices, *dev;
1269 g_return_val_if_fail (GDK_IS_DISPLAY (display), TRUE);
1271 device_manager = gdk_display_get_device_manager (display);
1272 devices = gdk_device_manager_list_devices (device_manager, GDK_DEVICE_TYPE_MASTER);
1274 for (dev = devices; dev; dev = dev->next)
1278 if (gdk_device_get_source (device) == GDK_SOURCE_MOUSE &&
1279 gdk_display_device_is_grabbed (display, device))
1287 * gdk_display_device_is_grabbed:
1288 * @display: a #GdkDisplay
1289 * @device: a #GdkDevice
1291 * Returns %TRUE if there is an ongoing grab on @device for @display.
1293 * Returns: %TRUE if there is a grab in effect for @device.
1296 gdk_display_device_is_grabbed (GdkDisplay *display,
1299 GdkDeviceGrabInfo *info;
1301 g_return_val_if_fail (GDK_IS_DISPLAY (display), TRUE);
1302 g_return_val_if_fail (GDK_IS_DEVICE (device), TRUE);
1304 /* What we're interested in is the steady state (ie last grab),
1305 because we're interested e.g. if we grabbed so that we
1306 can ungrab, even if our grab is not active just yet. */
1307 info = _gdk_display_get_last_device_grab (display, device);
1309 return (info && !info->implicit);
1313 * gdk_display_get_device_manager:
1314 * @display: a #GdkDisplay.
1316 * Returns the #GdkDeviceManager associated to @display.
1318 * Returns: (transfer none): A #GdkDeviceManager, or %NULL. This memory is
1319 * owned by GDK and must not be freed or unreferenced.
1324 gdk_display_get_device_manager (GdkDisplay *display)
1326 g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
1328 return display->device_manager;
1332 * gdk_display_get_name:
1333 * @display: a #GdkDisplay
1335 * Gets the name of the display.
1337 * Returns: a string representing the display name. This string is owned
1338 * by GDK and should not be modified or freed.
1342 G_CONST_RETURN gchar *
1343 gdk_display_get_name (GdkDisplay *display)
1345 return GDK_DISPLAY_GET_CLASS(display)->get_name (display);
1349 gdk_get_display (void)
1351 return g_strdup (gdk_display_get_name (gdk_display_get_default ()));
1355 * gdk_display_get_n_screens:
1356 * @display: a #GdkDisplay
1358 * Gets the number of screen managed by the @display.
1360 * Returns: number of screens.
1365 gdk_display_get_n_screens (GdkDisplay *display)
1367 return GDK_DISPLAY_GET_CLASS(display)->get_n_screens (display);
1371 * gdk_display_get_screen:
1372 * @display: a #GdkDisplay
1373 * @screen_num: the screen number
1375 * Returns a screen object for one of the screens of the display.
1377 * Returns: (transfer none): the #GdkScreen object
1382 gdk_display_get_screen (GdkDisplay *display,
1385 return GDK_DISPLAY_GET_CLASS(display)->get_screen (display, screen_num);
1389 * gdk_display_get_default_screen:
1390 * @display: a #GdkDisplay
1392 * Get the default #GdkScreen for @display.
1394 * Returns: (transfer none): the default #GdkScreen object for @display
1399 gdk_display_get_default_screen (GdkDisplay *display)
1401 return GDK_DISPLAY_GET_CLASS(display)->get_default_screen (display);
1406 * @display: a #GdkDisplay
1408 * Emits a short beep on @display
1413 gdk_display_beep (GdkDisplay *display)
1415 GDK_DISPLAY_GET_CLASS(display)->beep (display);
1420 * @display: a #GdkDisplay
1422 * Flushes any requests queued for the windowing system and waits until all
1423 * requests have been handled. This is often used for making sure that the
1424 * display is synchronized with the current state of the program. Calling
1425 * gdk_display_sync() before gdk_error_trap_pop() makes sure that any errors
1426 * generated from earlier requests are handled before the error trap is
1429 * This is most useful for X11. On windowing systems where requests are
1430 * handled synchronously, this function will do nothing.
1435 gdk_display_sync (GdkDisplay *display)
1437 GDK_DISPLAY_GET_CLASS(display)->sync (display);
1441 * gdk_display_flush:
1442 * @display: a #GdkDisplay
1444 * Flushes any requests queued for the windowing system; this happens automatically
1445 * when the main loop blocks waiting for new events, but if your application
1446 * is drawing without returning control to the main loop, you may need
1447 * to call this function explicitely. A common case where this function
1448 * needs to be called is when an application is executing drawing commands
1449 * from a thread other than the thread where the main loop is running.
1451 * This is most useful for X11. On windowing systems where requests are
1452 * handled synchronously, this function will do nothing.
1457 gdk_display_flush (GdkDisplay *display)
1459 GDK_DISPLAY_GET_CLASS(display)->flush (display);
1463 * gdk_display_get_default_group:
1464 * @display: a #GdkDisplay
1466 * Returns the default group leader window for all toplevel windows
1467 * on @display. This window is implicitly created by GDK.
1468 * See gdk_window_set_group().
1470 * Return value: (transfer none): The default group leader window
1476 gdk_display_get_default_group (GdkDisplay *display)
1478 return GDK_DISPLAY_GET_CLASS(display)->get_default_group (display);
1482 * gdk_display_supports_selection_notification:
1483 * @display: a #GdkDisplay
1485 * Returns whether #GdkEventOwnerChange events will be
1486 * sent when the owner of a selection changes.
1488 * Return value: whether #GdkEventOwnerChange events will
1494 gdk_display_supports_selection_notification (GdkDisplay *display)
1496 return GDK_DISPLAY_GET_CLASS(display)->supports_selection_notification (display);
1500 * gdk_display_request_selection_notification:
1501 * @display: a #GdkDisplay
1502 * @selection: the #GdkAtom naming the selection for which
1503 * ownership change notification is requested
1505 * Request #GdkEventOwnerChange events for ownership changes
1506 * of the selection named by the given atom.
1508 * Return value: whether #GdkEventOwnerChange events will
1514 gdk_display_request_selection_notification (GdkDisplay *display,
1518 return GDK_DISPLAY_GET_CLASS(display)->request_selection_notification (display, selection);
1522 * gdk_display_supports_clipboard_persistence
1523 * @display: a #GdkDisplay
1525 * Returns whether the speicifed display supports clipboard
1526 * persistance; i.e. if it's possible to store the clipboard data after an
1527 * application has quit. On X11 this checks if a clipboard daemon is
1530 * Returns: %TRUE if the display supports clipboard persistance.
1535 gdk_display_supports_clipboard_persistence (GdkDisplay *display)
1537 return GDK_DISPLAY_GET_CLASS(display)->supports_clipboard_persistence (display);
1541 * gdk_display_store_clipboard
1542 * @display: a #GdkDisplay
1543 * @clipboard_window: a #GdkWindow belonging to the clipboard owner
1544 * @time_: a timestamp
1545 * @targets: (array length=n_targets): an array of targets
1546 * that should be saved, or %NULL
1547 * if all available targets should be saved.
1548 * @n_targets: length of the @targets array
1550 * Issues a request to the clipboard manager to store the
1551 * clipboard data. On X11, this is a special program that works
1552 * according to the freedesktop clipboard specification, available at
1553 * <ulink url="http://www.freedesktop.org/Standards/clipboard-manager-spec">
1554 * http://www.freedesktop.org/Standards/clipboard-manager-spec</ulink>.
1559 gdk_display_store_clipboard (GdkDisplay *display,
1560 GdkWindow *clipboard_window,
1562 const GdkAtom *targets,
1565 GDK_DISPLAY_GET_CLASS(display)->store_clipboard (display, clipboard_window, time_, targets, n_targets);
1569 * gdk_display_supports_shapes:
1570 * @display: a #GdkDisplay
1572 * Returns %TRUE if gdk_window_shape_combine_mask() can
1573 * be used to create shaped windows on @display.
1575 * Returns: %TRUE if shaped windows are supported
1580 gdk_display_supports_shapes (GdkDisplay *display)
1582 return GDK_DISPLAY_GET_CLASS(display)->supports_shapes (display);
1586 * gdk_display_supports_input_shapes:
1587 * @display: a #GdkDisplay
1589 * Returns %TRUE if gdk_window_input_shape_combine_mask() can
1590 * be used to modify the input shape of windows on @display.
1592 * Returns: %TRUE if windows with modified input shape are supported
1597 gdk_display_supports_input_shapes (GdkDisplay *display)
1599 return GDK_DISPLAY_GET_CLASS(display)->supports_input_shapes (display);
1603 * gdk_display_supports_composite:
1604 * @display: a #GdkDisplay
1606 * Returns %TRUE if gdk_window_set_composited() can be used
1607 * to redirect drawing on the window using compositing.
1609 * Currently this only works on X11 with XComposite and
1610 * XDamage extensions available.
1612 * Returns: %TRUE if windows may be composited.
1617 gdk_display_supports_composite (GdkDisplay *display)
1619 return GDK_DISPLAY_GET_CLASS(display)->supports_composite (display);
1623 * gdk_display_list_devices:
1624 * @display: a #GdkDisplay
1626 * Returns the list of available input devices attached to @display.
1627 * The list is statically allocated and should not be freed.
1629 * Return value: (transfer none) (element-type GdkDevice):
1630 * a list of #GdkDevice
1634 * Deprecated: 3.0: Use gdk_device_manager_list_devices() instead.
1637 gdk_display_list_devices (GdkDisplay *display)
1639 return GDK_DISPLAY_GET_CLASS(display)->list_devices (display);
1642 static GdkAppLaunchContext *
1643 gdk_display_real_get_app_launch_context (GdkDisplay *display)
1645 GdkAppLaunchContext *ctx;
1647 ctx = g_object_new (GDK_TYPE_APP_LAUNCH_CONTEXT,
1655 * gdk_display_get_app_launch_context:
1656 * @display: a #GdkDisplay
1658 * Returns a #GdkAppLaunchContext suitable for launching
1659 * applications on the given display.
1661 * Returns: (transfer full): a new #GdkAppLaunchContext for @display.
1662 * Free with g_object_unref() when done
1666 GdkAppLaunchContext *
1667 gdk_display_get_app_launch_context (GdkDisplay *display)
1669 return GDK_DISPLAY_GET_CLASS(display)->get_app_launch_context (display);
1674 * @display_name: the name of the display to open
1678 * Return value: (transfer none): a #GdkDisplay, or %NULL
1679 * if the display could not be opened
1684 gdk_display_open (const gchar *display_name)
1686 return gdk_display_manager_open_display (gdk_display_manager_get (), display_name);
1690 * gdk_display_has_pending:
1691 * @display: a #GdkDisplay
1693 * Returns whether the display has events that are waiting
1696 * Returns: %TRUE if there are events ready to be processed.
1701 gdk_display_has_pending (GdkDisplay *display)
1703 return GDK_DISPLAY_GET_CLASS (display)->has_pending (display);
1707 * gdk_display_supports_cursor_alpha:
1708 * @display: a #GdkDisplay
1710 * Returns %TRUE if cursors can use an 8bit alpha channel
1711 * on @display. Otherwise, cursors are restricted to bilevel
1712 * alpha (i.e. a mask).
1714 * Returns: whether cursors can have alpha channels.
1719 gdk_display_supports_cursor_alpha (GdkDisplay *display)
1721 g_return_val_if_fail (GDK_IS_DISPLAY (display), FALSE);
1723 return GDK_DISPLAY_GET_CLASS (display)->supports_cursor_alpha (display);
1727 * gdk_display_supports_cursor_color:
1728 * @display: a #GdkDisplay
1730 * Returns %TRUE if multicolored cursors are supported
1731 * on @display. Otherwise, cursors have only a forground
1732 * and a background color.
1734 * Returns: whether cursors can have multiple colors.
1739 gdk_display_supports_cursor_color (GdkDisplay *display)
1741 g_return_val_if_fail (GDK_IS_DISPLAY (display), FALSE);
1743 return GDK_DISPLAY_GET_CLASS (display)->supports_cursor_color (display);
1747 * gdk_display_get_default_cursor_size:
1748 * @display: a #GdkDisplay
1750 * Returns the default size to use for cursors on @display.
1752 * Returns: the default cursor size.
1757 gdk_display_get_default_cursor_size (GdkDisplay *display)
1759 guint width, height;
1761 g_return_val_if_fail (GDK_IS_DISPLAY (display), FALSE);
1763 GDK_DISPLAY_GET_CLASS (display)->get_default_cursor_size (display,
1767 return MIN (width, height);
1771 * gdk_display_get_maximal_cursor_size:
1772 * @display: a #GdkDisplay
1773 * @width: (out): the return location for the maximal cursor width
1774 * @height: (out): the return location for the maximal cursor height
1776 * Gets the maximal size to use for cursors on @display.
1781 gdk_display_get_maximal_cursor_size (GdkDisplay *display,
1785 g_return_if_fail (GDK_IS_DISPLAY (display));
1787 GDK_DISPLAY_GET_CLASS (display)->get_maximal_cursor_size (display,
1793 * gdk_display_warp_pointer:
1794 * @display: a #GdkDisplay
1795 * @screen: the screen of @display to warp the pointer to
1796 * @x: the x coordinate of the destination
1797 * @y: the y coordinate of the destination
1799 * Warps the pointer of @display to the point @x,@y on
1800 * the screen @screen, unless the pointer is confined
1801 * to a window by a grab, in which case it will be moved
1802 * as far as allowed by the grab. Warping the pointer
1803 * creates events as if the user had moved the mouse
1804 * instantaneously to the destination.
1806 * Note that the pointer should normally be under the
1807 * control of the user. This function was added to cover
1808 * some rare use cases like keyboard navigation support
1809 * for the color picker in the #GtkColorSelectionDialog.
1813 * Deprecated: 3.0: Use gdk_device_warp() instead.
1816 gdk_display_warp_pointer (GdkDisplay *display,
1821 gdk_device_warp (display->core_pointer,
1827 _gdk_display_get_next_serial (GdkDisplay *display)
1829 return GDK_DISPLAY_GET_CLASS (display)->get_next_serial (display);
1834 * gdk_notify_startup_complete:
1836 * Indicates to the GUI environment that the application has finished
1837 * loading. If the applications opens windows, this function is
1838 * normally called after opening the application's initial set of
1841 * GTK+ will call this function automatically after opening the first
1842 * #GtkWindow unless gtk_window_set_auto_startup_notification() is called
1843 * to disable that feature.
1848 gdk_notify_startup_complete (void)
1850 gdk_notify_startup_complete_with_id (NULL);
1854 * gdk_notify_startup_complete_with_id:
1855 * @startup_id: a startup-notification identifier, for which
1856 * notification process should be completed
1858 * Indicates to the GUI environment that the application has
1859 * finished loading, using a given identifier.
1861 * GTK+ will call this function automatically for #GtkWindow
1862 * with custom startup-notification identifier unless
1863 * gtk_window_set_auto_startup_notification() is called to
1864 * disable that feature.
1869 gdk_notify_startup_complete_with_id (const gchar* startup_id)
1871 GdkDisplay *display;
1873 display = gdk_display_get_default ();
1875 gdk_display_notify_startup_complete (display, startup_id);
1879 * gdk_display_notify_startup_complete:
1880 * @display: a #GdkDisplay
1881 * @startup_id: a startup-notification identifier, for which
1882 * notification process should be completed
1884 * Indicates to the GUI environment that the application has
1885 * finished loading, using a given identifier.
1887 * GTK+ will call this function automatically for #GtkWindow
1888 * with custom startup-notification identifier unless
1889 * gtk_window_set_auto_startup_notification() is called to
1890 * disable that feature.
1895 gdk_display_notify_startup_complete (GdkDisplay *display,
1896 const gchar *startup_id)
1898 GDK_DISPLAY_GET_CLASS (display)->notify_startup_complete (display, startup_id);
1902 _gdk_display_event_data_copy (GdkDisplay *display,
1903 const GdkEvent *event,
1904 GdkEvent *new_event)
1906 GDK_DISPLAY_GET_CLASS (display)->event_data_copy (display, event, new_event);
1910 _gdk_display_event_data_free (GdkDisplay *display,
1913 GDK_DISPLAY_GET_CLASS (display)->event_data_free (display, event);
1917 _gdk_display_create_window_impl (GdkDisplay *display,
1919 GdkWindow *real_parent,
1921 GdkEventMask event_mask,
1922 GdkWindowAttr *attributes,
1923 gint attributes_mask)
1925 GDK_DISPLAY_GET_CLASS (display)->create_window_impl (display,
1935 _gdk_display_create_window (GdkDisplay *display)
1937 return g_object_new (GDK_DISPLAY_GET_CLASS (display)->window_type, NULL);
1941 * gdk_keymap_get_for_display:
1942 * @display: the #GdkDisplay.
1944 * Returns the #GdkKeymap attached to @display.
1946 * Return value: (transfer none): the #GdkKeymap attached to @display.
1951 gdk_keymap_get_for_display (GdkDisplay *display)
1953 return GDK_DISPLAY_GET_CLASS (display)->get_keymap (display);
1956 typedef struct _GdkGlobalErrorTrap GdkGlobalErrorTrap;
1958 struct _GdkGlobalErrorTrap
1963 static GQueue gdk_error_traps = G_QUEUE_INIT;
1966 * gdk_error_trap_push:
1968 * This function allows X errors to be trapped instead of the normal
1969 * behavior of exiting the application. It should only be used if it
1970 * is not possible to avoid the X error in any other way. Errors are
1971 * ignored on all #GdkDisplay currently known to the
1972 * #GdkDisplayManager. If you don't care which error happens and just
1973 * want to ignore everything, pop with gdk_error_trap_pop_ignored().
1974 * If you need the error code, use gdk_error_trap_pop() which may have
1975 * to block and wait for the error to arrive from the X server.
1977 * This API exists on all platforms but only does anything on X.
1979 * You can use gdk_x11_display_error_trap_push() to ignore errors
1980 * on only a single display.
1983 * <title>Trapping an X error</title>
1985 * gdk_error_trap_push (<!-- -->);
1987 * // ... Call the X function which may cause an error here ...
1990 * if (gdk_error_trap_pop (<!-- -->))
1992 * // ... Handle the error here ...
1998 gdk_error_trap_push (void)
2000 GdkDisplayManager *manager;
2001 GdkDisplayClass *class;
2002 GdkGlobalErrorTrap *trap;
2005 manager = gdk_display_manager_get ();
2006 class = GDK_DISPLAY_GET_CLASS (gdk_display_manager_get_default_display (manager));
2008 if (class->push_error_trap == NULL)
2011 trap = g_slice_new (GdkGlobalErrorTrap);
2012 trap->displays = gdk_display_manager_list_displays (manager);
2014 g_slist_foreach (trap->displays, (GFunc) g_object_ref, NULL);
2015 for (l = trap->displays; l != NULL; l = l->next)
2017 class->push_error_trap (l->data);
2020 g_queue_push_head (&gdk_error_traps, trap);
2024 gdk_error_trap_pop_internal (gboolean need_code)
2026 GdkDisplayManager *manager;
2027 GdkDisplayClass *class;
2028 GdkGlobalErrorTrap *trap;
2032 manager = gdk_display_manager_get ();
2033 class = GDK_DISPLAY_GET_CLASS (gdk_display_manager_get_default_display (manager));
2035 if (class->pop_error_trap == NULL)
2038 trap = g_queue_pop_head (&gdk_error_traps);
2040 g_return_val_if_fail (trap != NULL, 0);
2043 for (l = trap->displays; l != NULL; l = l->next)
2047 code = class->pop_error_trap (l->data, !need_code);
2049 /* we use the error on the last display listed, why not. */
2054 g_slist_free_full (trap->displays, g_object_unref);
2055 g_slice_free (GdkGlobalErrorTrap, trap);
2061 * gdk_error_trap_pop_ignored:
2063 * Removes an error trap pushed with gdk_error_trap_push(), but
2064 * without bothering to wait and see whether an error occurred. If an
2065 * error arrives later asynchronously that was triggered while the
2066 * trap was pushed, that error will be ignored.
2071 gdk_error_trap_pop_ignored (void)
2073 gdk_error_trap_pop_internal (FALSE);
2077 * gdk_error_trap_pop:
2079 * Removes an error trap pushed with gdk_error_trap_push().
2080 * May block until an error has been definitively received
2081 * or not received from the X server. gdk_error_trap_pop_ignored()
2082 * is preferred if you don't need to know whether an error
2083 * occurred, because it never has to block. If you don't
2084 * need the return value of gdk_error_trap_pop(), use
2085 * gdk_error_trap_pop_ignored().
2087 * Prior to GDK 3.0, this function would not automatically
2088 * sync for you, so you had to gdk_flush() if your last
2089 * call to Xlib was not a blocking round trip.
2091 * Return value: X error code or 0 on success
2094 gdk_error_trap_pop (void)
2096 return gdk_error_trap_pop_internal (TRUE);