1 /* GDK - The GIMP Drawing Kit
2 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
19 * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
20 * file for a list of people on the GTK+ Team. See the ChangeLog
21 * files for a list of changes. These files are distributed with
22 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
27 #include "gdkinternals.h"
28 #include "gdkdisplayprivate.h"
36 * @Short_description: Functions for handling events from the window system
38 * @See_also: <link linkend="gdk-Event-Structures">Event Structures</link>
40 * This section describes functions dealing with events from the window
43 * In GTK+ applications the events are handled automatically in
44 * gtk_main_do_event() and passed on to the appropriate widgets, so these
45 * functions are rarely needed. Though some of the fields in the
46 * <link linkend="gdk-Event-Structures">Event Structures</link> are useful.
50 typedef struct _GdkIOClosure GdkIOClosure;
54 GDestroyNotify notify;
58 /* Private variable declarations
61 static GdkEventFunc _gdk_event_func = NULL; /* Callback for events */
62 static gpointer _gdk_event_data = NULL;
63 static GDestroyNotify _gdk_event_notify = NULL;
66 _gdk_event_emit (GdkEvent *event)
69 (*_gdk_event_func) (event, _gdk_event_data);
72 /*********************************************
73 * Functions for maintaining the event queue *
74 *********************************************/
77 * _gdk_event_queue_find_first:
78 * @display: a #GdkDisplay
80 * Find the first event on the queue that is not still
83 * Return value: Pointer to the list node for that event, or NULL.
86 _gdk_event_queue_find_first (GdkDisplay *display)
88 GList *tmp_list = display->queued_events;
92 GdkEventPrivate *event = tmp_list->data;
93 if (!(event->flags & GDK_EVENT_PENDING))
96 tmp_list = g_list_next (tmp_list);
103 * _gdk_event_queue_prepend:
104 * @display: a #GdkDisplay
105 * @event: Event to prepend.
107 * Prepends an event before the head of the event queue.
109 * Returns: the newly prepended list node.
112 _gdk_event_queue_prepend (GdkDisplay *display,
115 display->queued_events = g_list_prepend (display->queued_events, event);
116 if (!display->queued_tail)
117 display->queued_tail = display->queued_events;
118 return display->queued_events;
122 * _gdk_event_queue_append:
123 * @display: a #GdkDisplay
124 * @event: Event to append.
126 * Appends an event onto the tail of the event queue.
128 * Returns: the newly appended list node.
131 _gdk_event_queue_append (GdkDisplay *display,
134 display->queued_tail = g_list_append (display->queued_tail, event);
136 if (!display->queued_events)
137 display->queued_events = display->queued_tail;
139 display->queued_tail = display->queued_tail->next;
141 return display->queued_tail;
145 * _gdk_event_queue_insert_after:
146 * @display: a #GdkDisplay
147 * @sibling: Append after this event.
148 * @event: Event to append.
150 * Appends an event after the specified event, or if it isn't in
151 * the queue, onto the tail of the event queue.
153 * Returns: the newly appended list node.
158 _gdk_event_queue_insert_after (GdkDisplay *display,
162 GList *prev = g_list_find (display->queued_events, sibling);
163 if (prev && prev->next)
165 display->queued_events = g_list_insert_before (display->queued_events, prev->next, event);
169 return _gdk_event_queue_append (display, event);
173 * _gdk_event_queue_insert_after:
174 * @display: a #GdkDisplay
175 * @sibling: Append after this event.
176 * @event: Event to append.
178 * Appends an event before the specified event, or if it isn't in
179 * the queue, onto the tail of the event queue.
181 * Returns: the newly appended list node.
186 _gdk_event_queue_insert_before (GdkDisplay *display,
190 GList *next = g_list_find (display->queued_events, sibling);
193 display->queued_events = g_list_insert_before (display->queued_events, next, event);
197 return _gdk_event_queue_append (display, event);
202 * _gdk_event_queue_remove_link:
203 * @display: a #GdkDisplay
204 * @node: node to remove
206 * Removes a specified list node from the event queue.
209 _gdk_event_queue_remove_link (GdkDisplay *display,
213 node->prev->next = node->next;
215 display->queued_events = node->next;
218 node->next->prev = node->prev;
220 display->queued_tail = node->prev;
224 * _gdk_event_unqueue:
225 * @display: a #GdkDisplay
227 * Removes and returns the first event from the event
228 * queue that is not still being filled in.
230 * Return value: the event, or %NULL. Ownership is transferred
234 _gdk_event_unqueue (GdkDisplay *display)
236 GdkEvent *event = NULL;
239 tmp_list = _gdk_event_queue_find_first (display);
243 event = tmp_list->data;
244 _gdk_event_queue_remove_link (display, tmp_list);
245 g_list_free_1 (tmp_list);
252 * gdk_event_handler_set:
253 * @func: the function to call to handle events from GDK.
254 * @data: user data to pass to the function.
255 * @notify: the function to call when the handler function is removed, i.e. when
256 * gdk_event_handler_set() is called with another event handler.
258 * Sets the function to call to handle all events from GDK.
260 * Note that GTK+ uses this to install its own event handler, so it is
261 * usually not useful for GTK+ applications. (Although an application
262 * can call this function then call gtk_main_do_event() to pass
266 gdk_event_handler_set (GdkEventFunc func,
268 GDestroyNotify notify)
270 if (_gdk_event_notify)
271 (*_gdk_event_notify) (_gdk_event_data);
273 _gdk_event_func = func;
274 _gdk_event_data = data;
275 _gdk_event_notify = notify;
279 * gdk_events_pending:
281 * Checks if any events are ready to be processed for any display.
283 * Return value: %TRUE if any events are pending.
286 gdk_events_pending (void)
292 list = gdk_display_manager_list_displays (gdk_display_manager_get ());
293 for (l = list; l; l = l->next)
295 if (_gdk_event_queue_find_first (l->data))
302 for (l = list; l; l = l->next)
304 if (gdk_display_has_pending (l->data))
320 * Checks all open displays for a #GdkEvent to process,to be processed
321 * on, fetching events from the windowing system if necessary.
322 * See gdk_display_get_event().
324 * Return value: the next #GdkEvent to be processed, or %NULL if no events
325 * are pending. The returned #GdkEvent should be freed with gdk_event_free().
334 list = gdk_display_manager_list_displays (gdk_display_manager_get ());
335 for (l = list; l; l = l->next)
337 event = gdk_display_get_event (l->data);
350 * If there is an event waiting in the event queue of some open
351 * display, returns a copy of it. See gdk_display_peek_event().
353 * Return value: a copy of the first #GdkEvent on some event queue, or %NULL if no
354 * events are in any queues. The returned #GdkEvent should be freed with
358 gdk_event_peek (void)
364 list = gdk_display_manager_list_displays (gdk_display_manager_get ());
365 for (l = list; l; l = l->next)
367 event = gdk_display_peek_event (l->data);
379 * @event: a #GdkEvent.
381 * Appends a copy of the given event onto the front of the event
382 * queue for event->any.window's display, or the default event
383 * queue if event->any.window is %NULL. See gdk_display_put_event().
386 gdk_event_put (const GdkEvent *event)
390 g_return_if_fail (event != NULL);
392 if (event->any.window)
393 display = gdk_window_get_display (event->any.window);
397 g_message ("Falling back to default display for gdk_event_put()"));
398 display = gdk_display_get_default ();
401 gdk_display_put_event (display, event);
404 static GHashTable *event_hash = NULL;
408 * @type: a #GdkEventType
410 * Creates a new event of the given type. All fields are set to 0.
412 * Return value: a newly-allocated #GdkEvent. The returned #GdkEvent
413 * should be freed with gdk_event_free().
418 gdk_event_new (GdkEventType type)
420 GdkEventPrivate *new_private;
424 event_hash = g_hash_table_new (g_direct_hash, NULL);
426 new_private = g_slice_new0 (GdkEventPrivate);
428 new_private->flags = 0;
429 new_private->screen = NULL;
431 g_hash_table_insert (event_hash, new_private, GUINT_TO_POINTER (1));
433 new_event = (GdkEvent *) new_private;
435 new_event->any.type = type;
438 * Bytewise 0 initialization is reasonable for most of the
439 * current event types. Explicitely initialize double fields
440 * since I trust bytewise 0 == 0. less than for integers
445 case GDK_MOTION_NOTIFY:
446 new_event->motion.x = 0.;
447 new_event->motion.y = 0.;
448 new_event->motion.x_root = 0.;
449 new_event->motion.y_root = 0.;
451 case GDK_BUTTON_PRESS:
452 case GDK_2BUTTON_PRESS:
453 case GDK_3BUTTON_PRESS:
454 case GDK_BUTTON_RELEASE:
455 new_event->button.x = 0.;
456 new_event->button.y = 0.;
457 new_event->button.x_root = 0.;
458 new_event->button.y_root = 0.;
461 new_event->scroll.x = 0.;
462 new_event->scroll.y = 0.;
463 new_event->scroll.x_root = 0.;
464 new_event->scroll.y_root = 0.;
466 case GDK_ENTER_NOTIFY:
467 case GDK_LEAVE_NOTIFY:
468 new_event->crossing.x = 0.;
469 new_event->crossing.y = 0.;
470 new_event->crossing.x_root = 0.;
471 new_event->crossing.y_root = 0.;
481 gdk_event_is_allocated (const GdkEvent *event)
484 return g_hash_table_lookup (event_hash, event) != NULL;
490 _gdk_event_set_pointer_emulated (GdkEvent *event,
493 if (gdk_event_is_allocated (event))
495 GdkEventPrivate *private = (GdkEventPrivate *) event;
498 private->flags |= GDK_EVENT_POINTER_EMULATED;
500 private->flags &= ~(GDK_EVENT_POINTER_EMULATED);
505 _gdk_event_get_pointer_emulated (GdkEvent *event)
507 if (gdk_event_is_allocated (event))
508 return (((GdkEventPrivate *) event)->flags & GDK_EVENT_POINTER_EMULATED) != 0;
515 * @event: a #GdkEvent
517 * Copies a #GdkEvent, copying or incrementing the reference count of the
518 * resources associated with it (e.g. #GdkWindow's and strings).
520 * Return value: a copy of @event. The returned #GdkEvent should be freed with
524 gdk_event_copy (const GdkEvent *event)
526 GdkEventPrivate *new_private;
529 g_return_val_if_fail (event != NULL, NULL);
531 new_event = gdk_event_new (GDK_NOTHING);
532 new_private = (GdkEventPrivate *)new_event;
535 if (new_event->any.window)
536 g_object_ref (new_event->any.window);
538 if (gdk_event_is_allocated (event))
540 GdkEventPrivate *private = (GdkEventPrivate *)event;
542 new_private->screen = private->screen;
543 new_private->device = private->device;
544 new_private->source_device = private->source_device;
547 switch (event->any.type)
550 case GDK_KEY_RELEASE:
551 new_event->key.string = g_strdup (event->key.string);
554 case GDK_ENTER_NOTIFY:
555 case GDK_LEAVE_NOTIFY:
556 if (event->crossing.subwindow != NULL)
557 g_object_ref (event->crossing.subwindow);
562 case GDK_DRAG_MOTION:
563 case GDK_DRAG_STATUS:
565 case GDK_DROP_FINISHED:
566 g_object_ref (event->dnd.context);
571 if (event->expose.region)
572 new_event->expose.region = cairo_region_copy (event->expose.region);
576 new_event->setting.name = g_strdup (new_event->setting.name);
579 case GDK_BUTTON_PRESS:
580 case GDK_2BUTTON_PRESS:
581 case GDK_3BUTTON_PRESS:
582 case GDK_BUTTON_RELEASE:
583 if (event->button.axes)
584 new_event->button.axes = g_memdup (event->button.axes,
585 sizeof (gdouble) * gdk_device_get_n_axes (event->button.device));
588 case GDK_MOTION_NOTIFY:
589 if (event->motion.axes)
590 new_event->motion.axes = g_memdup (event->motion.axes,
591 sizeof (gdouble) * gdk_device_get_n_axes (event->motion.device));
594 case GDK_OWNER_CHANGE:
595 new_event->owner_change.owner = event->owner_change.owner;
596 if (new_event->owner_change.owner)
597 g_object_ref (new_event->owner_change.owner);
600 case GDK_SELECTION_CLEAR:
601 case GDK_SELECTION_NOTIFY:
602 case GDK_SELECTION_REQUEST:
603 new_event->selection.requestor = event->selection.requestor;
604 if (new_event->selection.requestor)
605 g_object_ref (new_event->selection.requestor);
612 if (gdk_event_is_allocated (event))
613 _gdk_display_event_data_copy (gdk_display_get_default (), event, new_event);
620 * @event: a #GdkEvent.
622 * Frees a #GdkEvent, freeing or decrementing any resources associated with it.
623 * Note that this function should only be called with events returned from
624 * functions such as gdk_event_peek(), gdk_event_get(), gdk_event_copy()
625 * and gdk_event_new().
628 gdk_event_free (GdkEvent *event)
632 g_return_if_fail (event != NULL);
634 if (event->any.window)
635 g_object_unref (event->any.window);
637 switch (event->any.type)
640 case GDK_KEY_RELEASE:
641 g_free (event->key.string);
644 case GDK_ENTER_NOTIFY:
645 case GDK_LEAVE_NOTIFY:
646 if (event->crossing.subwindow != NULL)
647 g_object_unref (event->crossing.subwindow);
652 case GDK_DRAG_MOTION:
653 case GDK_DRAG_STATUS:
655 case GDK_DROP_FINISHED:
656 if (event->dnd.context != NULL)
657 g_object_unref (event->dnd.context);
660 case GDK_BUTTON_PRESS:
661 case GDK_2BUTTON_PRESS:
662 case GDK_3BUTTON_PRESS:
663 case GDK_BUTTON_RELEASE:
664 g_free (event->button.axes);
669 if (event->expose.region)
670 cairo_region_destroy (event->expose.region);
673 case GDK_MOTION_NOTIFY:
674 g_free (event->motion.axes);
678 g_free (event->setting.name);
681 case GDK_OWNER_CHANGE:
682 if (event->owner_change.owner)
683 g_object_unref (event->owner_change.owner);
686 case GDK_SELECTION_CLEAR:
687 case GDK_SELECTION_NOTIFY:
688 case GDK_SELECTION_REQUEST:
689 if (event->selection.requestor)
690 g_object_unref (event->selection.requestor);
697 display = gdk_display_get_default ();
699 _gdk_display_event_data_free (display, event);
701 g_hash_table_remove (event_hash, event);
702 g_slice_free (GdkEventPrivate, (GdkEventPrivate*) event);
706 * gdk_event_get_time:
707 * @event: a #GdkEvent
709 * Returns the time stamp from @event, if there is one; otherwise
710 * returns #GDK_CURRENT_TIME. If @event is %NULL, returns #GDK_CURRENT_TIME.
712 * Return value: time stamp field from @event
715 gdk_event_get_time (const GdkEvent *event)
720 case GDK_MOTION_NOTIFY:
721 return event->motion.time;
722 case GDK_BUTTON_PRESS:
723 case GDK_2BUTTON_PRESS:
724 case GDK_3BUTTON_PRESS:
725 case GDK_BUTTON_RELEASE:
726 return event->button.time;
728 return event->scroll.time;
730 case GDK_KEY_RELEASE:
731 return event->key.time;
732 case GDK_ENTER_NOTIFY:
733 case GDK_LEAVE_NOTIFY:
734 return event->crossing.time;
735 case GDK_PROPERTY_NOTIFY:
736 return event->property.time;
737 case GDK_SELECTION_CLEAR:
738 case GDK_SELECTION_REQUEST:
739 case GDK_SELECTION_NOTIFY:
740 return event->selection.time;
741 case GDK_PROXIMITY_IN:
742 case GDK_PROXIMITY_OUT:
743 return event->proximity.time;
746 case GDK_DRAG_MOTION:
747 case GDK_DRAG_STATUS:
749 case GDK_DROP_FINISHED:
750 return event->dnd.time;
751 case GDK_CLIENT_EVENT:
752 case GDK_VISIBILITY_NOTIFY:
754 case GDK_FOCUS_CHANGE:
762 case GDK_WINDOW_STATE:
764 case GDK_OWNER_CHANGE:
765 case GDK_GRAB_BROKEN:
767 /* return current time */
771 return GDK_CURRENT_TIME;
775 * gdk_event_get_state:
776 * @event: a #GdkEvent or NULL
777 * @state: (out): return location for state
779 * If the event contains a "state" field, puts that field in @state. Otherwise
780 * stores an empty state (0). Returns %TRUE if there was a state field
781 * in the event. @event may be %NULL, in which case it's treated
782 * as if the event had no state field.
784 * Return value: %TRUE if there was a state field in the event
787 gdk_event_get_state (const GdkEvent *event,
788 GdkModifierType *state)
790 g_return_val_if_fail (state != NULL, FALSE);
795 case GDK_MOTION_NOTIFY:
796 *state = event->motion.state;
798 case GDK_BUTTON_PRESS:
799 case GDK_2BUTTON_PRESS:
800 case GDK_3BUTTON_PRESS:
801 case GDK_BUTTON_RELEASE:
802 *state = event->button.state;
805 *state = event->scroll.state;
808 case GDK_KEY_RELEASE:
809 *state = event->key.state;
811 case GDK_ENTER_NOTIFY:
812 case GDK_LEAVE_NOTIFY:
813 *state = event->crossing.state;
815 case GDK_PROPERTY_NOTIFY:
816 case GDK_VISIBILITY_NOTIFY:
817 case GDK_CLIENT_EVENT:
819 case GDK_FOCUS_CHANGE:
820 case GDK_SELECTION_CLEAR:
821 case GDK_SELECTION_REQUEST:
822 case GDK_SELECTION_NOTIFY:
823 case GDK_PROXIMITY_IN:
824 case GDK_PROXIMITY_OUT:
828 case GDK_DRAG_MOTION:
829 case GDK_DRAG_STATUS:
831 case GDK_DROP_FINISHED:
838 case GDK_WINDOW_STATE:
840 case GDK_OWNER_CHANGE:
841 case GDK_GRAB_BROKEN:
852 * gdk_event_get_coords:
853 * @event: a #GdkEvent
854 * @x_win: (out): location to put event window x coordinate
855 * @y_win: (out): location to put event window y coordinate
857 * Extract the event window relative x/y coordinates from an event.
859 * Return value: %TRUE if the event delivered event window coordinates
862 gdk_event_get_coords (const GdkEvent *event,
866 gdouble x = 0, y = 0;
867 gboolean fetched = TRUE;
869 g_return_val_if_fail (event != NULL, FALSE);
874 x = event->configure.x;
875 y = event->configure.y;
877 case GDK_ENTER_NOTIFY:
878 case GDK_LEAVE_NOTIFY:
879 x = event->crossing.x;
880 y = event->crossing.y;
886 case GDK_BUTTON_PRESS:
887 case GDK_2BUTTON_PRESS:
888 case GDK_3BUTTON_PRESS:
889 case GDK_BUTTON_RELEASE:
893 case GDK_MOTION_NOTIFY:
911 * gdk_event_get_root_coords:
912 * @event: a #GdkEvent
913 * @x_root: (out): location to put root window x coordinate
914 * @y_root: (out): location to put root window y coordinate
916 * Extract the root window relative x/y coordinates from an event.
918 * Return value: %TRUE if the event delivered root window coordinates
921 gdk_event_get_root_coords (const GdkEvent *event,
925 gdouble x = 0, y = 0;
926 gboolean fetched = TRUE;
928 g_return_val_if_fail (event != NULL, FALSE);
932 case GDK_MOTION_NOTIFY:
933 x = event->motion.x_root;
934 y = event->motion.y_root;
937 x = event->scroll.x_root;
938 y = event->scroll.y_root;
940 case GDK_BUTTON_PRESS:
941 case GDK_2BUTTON_PRESS:
942 case GDK_3BUTTON_PRESS:
943 case GDK_BUTTON_RELEASE:
944 x = event->button.x_root;
945 y = event->button.y_root;
947 case GDK_ENTER_NOTIFY:
948 case GDK_LEAVE_NOTIFY:
949 x = event->crossing.x_root;
950 y = event->crossing.y_root;
954 case GDK_DRAG_MOTION:
955 case GDK_DRAG_STATUS:
957 case GDK_DROP_FINISHED:
958 x = event->dnd.x_root;
959 y = event->dnd.y_root;
975 * gdk_event_get_button:
976 * @event: a #GdkEvent
977 * @button: (out): location to store mouse button number
979 * Extract the button number from an event.
981 * Return value: %TRUE if the event delivered a button number
986 gdk_event_get_button (const GdkEvent *event,
989 gboolean fetched = TRUE;
992 g_return_val_if_fail (event != NULL, FALSE);
996 case GDK_BUTTON_PRESS:
997 case GDK_2BUTTON_PRESS:
998 case GDK_3BUTTON_PRESS:
999 case GDK_BUTTON_RELEASE:
1000 number = event->button.button;
1014 * gdk_event_get_click_count:
1015 * @event: a #GdkEvent
1016 * @click_count: (out): location to store click count
1018 * Extracts the click count from an event.
1020 * Return value: %TRUE if the event delivered a click count
1025 gdk_event_get_click_count (const GdkEvent *event,
1028 gboolean fetched = TRUE;
1031 g_return_val_if_fail (event != NULL, FALSE);
1033 switch (event->type)
1035 case GDK_BUTTON_PRESS:
1036 case GDK_BUTTON_RELEASE:
1039 case GDK_2BUTTON_PRESS:
1042 case GDK_3BUTTON_PRESS:
1051 *click_count = number;
1057 * gdk_event_get_keyval:
1058 * @event: a #GdkEvent
1059 * @keyval: (out): location to store the keyval
1061 * Extracts the keyval from an event.
1063 * Return value: %TRUE if the event delivered a key symbol
1068 gdk_event_get_keyval (const GdkEvent *event,
1071 gboolean fetched = TRUE;
1074 switch (event->type)
1077 case GDK_KEY_RELEASE:
1078 number = event->key.keyval;
1092 * gdk_event_get_keycode:
1093 * @event: a #GdkEvent
1094 * @keycode: (out): location to store the keycode
1096 * Extracts the hardware keycode from an event.
1098 * Return value: %TRUE if the event delivered a hardware keycode
1103 gdk_event_get_keycode (const GdkEvent *event,
1106 gboolean fetched = TRUE;
1109 switch (event->type)
1112 case GDK_KEY_RELEASE:
1113 number = event->key.hardware_keycode;
1127 * gdk_event_get_scroll_direction:
1128 * @event: a #GdkEvent
1129 * @direction: (out): location to store the scroll direction
1131 * Extracts the scroll direction from an event.
1133 * Return value: %TRUE if the event delivered a scroll direction
1138 gdk_event_get_scroll_direction (const GdkEvent *event,
1139 GdkScrollDirection *direction)
1141 gboolean fetched = TRUE;
1142 GdkScrollDirection dir = 0;
1144 switch (event->type)
1147 dir = event->scroll.direction;
1161 * gdk_event_get_axis:
1162 * @event: a #GdkEvent
1163 * @axis_use: the axis use to look for
1164 * @value: (out): location to store the value found
1166 * Extract the axis value for a particular axis use from
1167 * an event structure.
1169 * Return value: %TRUE if the specified axis was found, otherwise %FALSE
1172 gdk_event_get_axis (const GdkEvent *event,
1173 GdkAxisUse axis_use,
1179 g_return_val_if_fail (event != NULL, FALSE);
1181 if (axis_use == GDK_AXIS_X || axis_use == GDK_AXIS_Y)
1185 switch (event->type)
1187 case GDK_MOTION_NOTIFY:
1188 x = event->motion.x;
1189 y = event->motion.y;
1192 x = event->scroll.x;
1193 y = event->scroll.y;
1195 case GDK_BUTTON_PRESS:
1196 case GDK_BUTTON_RELEASE:
1197 x = event->button.x;
1198 y = event->button.y;
1200 case GDK_ENTER_NOTIFY:
1201 case GDK_LEAVE_NOTIFY:
1202 x = event->crossing.x;
1203 y = event->crossing.y;
1210 if (axis_use == GDK_AXIS_X && value)
1212 if (axis_use == GDK_AXIS_Y && value)
1217 else if (event->type == GDK_BUTTON_PRESS ||
1218 event->type == GDK_BUTTON_RELEASE)
1220 device = event->button.device;
1221 axes = event->button.axes;
1223 else if (event->type == GDK_MOTION_NOTIFY)
1225 device = event->motion.device;
1226 axes = event->motion.axes;
1231 return gdk_device_get_axis (device, axes, axis_use, value);
1235 * gdk_event_set_device:
1236 * @event: a #GdkEvent
1237 * @device: a #GdkDevice
1239 * Sets the device for @event to @device. The event must
1240 * have been allocated by GTK+, for instance, by
1246 gdk_event_set_device (GdkEvent *event,
1249 GdkEventPrivate *private;
1251 g_return_if_fail (gdk_event_is_allocated (event));
1253 private = (GdkEventPrivate *) event;
1255 private->device = device;
1257 switch (event->type)
1259 case GDK_MOTION_NOTIFY:
1260 event->motion.device = device;
1262 case GDK_BUTTON_PRESS:
1263 case GDK_2BUTTON_PRESS:
1264 case GDK_3BUTTON_PRESS:
1265 case GDK_BUTTON_RELEASE:
1266 event->button.device = device;
1269 event->scroll.device = device;
1271 case GDK_PROXIMITY_IN:
1272 case GDK_PROXIMITY_OUT:
1273 event->proximity.device = device;
1281 * gdk_event_get_device:
1282 * @event: a #GdkEvent.
1284 * If the event contains a "device" field, this function will return
1285 * it, else it will return %NULL.
1287 * Returns: (transfer none): a #GdkDevice, or %NULL.
1292 gdk_event_get_device (const GdkEvent *event)
1294 g_return_val_if_fail (event != NULL, NULL);
1296 if (gdk_event_is_allocated (event))
1298 GdkEventPrivate *private = (GdkEventPrivate *) event;
1300 if (private->device)
1301 return private->device;
1304 switch (event->type)
1306 case GDK_MOTION_NOTIFY:
1307 return event->motion.device;
1308 case GDK_BUTTON_PRESS:
1309 case GDK_2BUTTON_PRESS:
1310 case GDK_3BUTTON_PRESS:
1311 case GDK_BUTTON_RELEASE:
1312 return event->button.device;
1314 return event->scroll.device;
1315 case GDK_PROXIMITY_IN:
1316 case GDK_PROXIMITY_OUT:
1317 return event->proximity.device;
1322 /* Fallback if event has no device set */
1323 switch (event->type)
1325 case GDK_MOTION_NOTIFY:
1326 case GDK_BUTTON_PRESS:
1327 case GDK_2BUTTON_PRESS:
1328 case GDK_3BUTTON_PRESS:
1329 case GDK_BUTTON_RELEASE:
1330 case GDK_ENTER_NOTIFY:
1331 case GDK_LEAVE_NOTIFY:
1332 case GDK_FOCUS_CHANGE:
1333 case GDK_PROXIMITY_IN:
1334 case GDK_PROXIMITY_OUT:
1335 case GDK_DRAG_ENTER:
1336 case GDK_DRAG_LEAVE:
1337 case GDK_DRAG_MOTION:
1338 case GDK_DRAG_STATUS:
1339 case GDK_DROP_START:
1340 case GDK_DROP_FINISHED:
1342 case GDK_GRAB_BROKEN:
1344 case GDK_KEY_RELEASE:
1346 GdkDisplay *display;
1347 GdkDeviceManager *device_manager;
1348 GdkDevice *client_pointer;
1350 g_warning ("Event with type %d not holding a GdkDevice. "
1351 "It is most likely synthesized outside Gdk/GTK+\n",
1354 display = gdk_window_get_display (event->any.window);
1355 device_manager = gdk_display_get_device_manager (display);
1356 client_pointer = gdk_device_manager_get_client_pointer (device_manager);
1358 if (event->type == GDK_KEY_PRESS ||
1359 event->type == GDK_KEY_RELEASE)
1360 return gdk_device_get_associated_device (client_pointer);
1362 return client_pointer;
1371 * gdk_event_set_source_device:
1372 * @event: a #GdkEvent
1373 * @device: a #GdkDevice
1375 * Sets the slave device for @event to @device.
1377 * The event must have been allocated by GTK+,
1378 * for instance by gdk_event_copy().
1383 gdk_event_set_source_device (GdkEvent *event,
1386 GdkEventPrivate *private;
1388 g_return_if_fail (gdk_event_is_allocated (event));
1389 g_return_if_fail (GDK_IS_DEVICE (device));
1391 private = (GdkEventPrivate *) event;
1393 private->source_device = device;
1397 * gdk_event_get_source_device:
1398 * @event: a #GdkEvent
1400 * This function returns the hardware (slave) #GdkDevice that has
1401 * triggered the event, falling back to the virtual (master) device
1402 * (as in gdk_event_get_device()) if the event wasn't caused by
1403 * interaction with a hardware device. This may happen for example
1404 * in synthesized crossing events after a #GdkWindow updates its
1405 * geometry or a grab is acquired/released.
1407 * If the event does not contain a device field, this function will
1410 * Returns: (transfer none): a #GdkDevice, or %NULL.
1415 gdk_event_get_source_device (const GdkEvent *event)
1417 GdkEventPrivate *private;
1419 g_return_val_if_fail (event != NULL, NULL);
1421 if (!gdk_event_is_allocated (event))
1424 private = (GdkEventPrivate *) event;
1426 if (private->source_device)
1427 return private->source_device;
1429 /* Fallback to event device */
1430 return gdk_event_get_device (event);
1434 * gdk_event_request_motions:
1435 * @event: a valid #GdkEvent
1437 * Request more motion notifies if @event is a motion notify hint event.
1439 * This function should be used instead of gdk_window_get_pointer() to
1440 * request further motion notifies, because it also works for extension
1441 * events where motion notifies are provided for devices other than the
1442 * core pointer. Coordinate extraction, processing and requesting more
1443 * motion events from a %GDK_MOTION_NOTIFY event usually works like this:
1447 * /* motion_event handler */
1448 * x = motion_event->x;
1449 * y = motion_event->y;
1450 * /* handle (x,y) motion */
1451 * gdk_event_request_motions (motion_event); /* handles is_hint events */
1458 gdk_event_request_motions (const GdkEventMotion *event)
1460 GdkDisplay *display;
1462 g_return_if_fail (event != NULL);
1464 if (event->type == GDK_MOTION_NOTIFY && event->is_hint)
1466 gdk_device_get_state (event->device, event->window, NULL, NULL);
1468 display = gdk_window_get_display (event->window);
1469 _gdk_display_enable_motion_hints (display, event->device);
1474 * gdk_event_triggers_context_menu:
1475 * @event: a #GdkEvent, currently only button events are meaningful values
1477 * This function returns whether a #GdkEventButton should trigger a
1478 * context menu, according to platform conventions. The right mouse
1479 * button always triggers context menus. Additionally, if
1480 * gdk_keymap_get_modifier_mask() returns a non-0 mask for
1481 * %GDK_MODIFIER_INTENT_CONTEXT_MENU, then the left mouse button will
1482 * also trigger a context menu if this modifier is pressed.
1484 * This function should always be used instead of simply checking for
1485 * event->button == %GDK_BUTTON_SECONDARY.
1487 * Returns: %TRUE if the event should trigger a context menu.
1492 gdk_event_triggers_context_menu (const GdkEvent *event)
1494 g_return_val_if_fail (event != NULL, FALSE);
1496 if (event->type == GDK_BUTTON_PRESS)
1498 const GdkEventButton *bevent = (const GdkEventButton *) event;
1499 GdkDisplay *display;
1500 GdkModifierType modifier;
1502 g_return_val_if_fail (GDK_IS_WINDOW (bevent->window), FALSE);
1504 if (bevent->button == GDK_BUTTON_SECONDARY &&
1505 ! (bevent->state & (GDK_BUTTON1_MASK | GDK_BUTTON2_MASK)))
1508 display = gdk_window_get_display (bevent->window);
1510 modifier = gdk_keymap_get_modifier_mask (gdk_keymap_get_for_display (display),
1511 GDK_MODIFIER_INTENT_CONTEXT_MENU);
1513 if (modifier != 0 &&
1514 bevent->button == GDK_BUTTON_PRIMARY &&
1515 ! (bevent->state & (GDK_BUTTON2_MASK | GDK_BUTTON3_MASK)) &&
1516 (bevent->state & modifier))
1524 gdk_events_get_axis_distances (GdkEvent *event1,
1526 gdouble *x_distance,
1527 gdouble *y_distance,
1530 gdouble x1, x2, y1, y2;
1533 if (!gdk_event_get_coords (event1, &x1, &y1) ||
1534 !gdk_event_get_coords (event2, &x2, &y2))
1547 *distance = sqrt ((xd * xd) + (yd * yd));
1553 * gdk_events_get_distance:
1554 * @event1: first #GdkEvent
1555 * @event2: second #GdkEvent
1556 * @distance: (out): return location for the distance
1558 * If both events have X/Y information, the distance between both coordinates
1559 * (as in a straight line going from @event1 to @event2) will be returned.
1561 * Returns: %TRUE if the distance could be calculated.
1566 gdk_events_get_distance (GdkEvent *event1,
1570 return gdk_events_get_axis_distances (event1, event2,
1576 * gdk_events_get_angle:
1577 * @event1: first #GdkEvent
1578 * @event2: second #GdkEvent
1579 * @angle: (out): return location for the relative angle between both events
1581 * If both events contain X/Y information, this function will return %TRUE
1582 * and return in @angle the relative angle from @event1 to @event2. The rotation
1583 * direction for positive angles is from the positive X axis towards the positive
1586 * Returns: %TRUE if the angle could be calculated.
1591 gdk_events_get_angle (GdkEvent *event1,
1595 gdouble x_distance, y_distance, distance;
1597 if (!gdk_events_get_axis_distances (event1, event2,
1598 &x_distance, &y_distance,
1604 *angle = atan2 (x_distance, y_distance);
1607 *angle = (2 * G_PI) - *angle;
1612 /* And constraint it to 0°-360° */
1613 *angle = fmod (*angle, 2 * G_PI);
1620 * gdk_events_get_center:
1621 * @event1: first #GdkEvent
1622 * @event2: second #GdkEvent
1623 * @x: (out): return location for the X coordinate of the center
1624 * @y: (out): return location for the Y coordinate of the center
1626 * If both events contain X/Y information, the center of both coordinates
1627 * will be returned in @x and @y.
1629 * Returns: %TRUE if the center could be calculated.
1634 gdk_events_get_center (GdkEvent *event1,
1639 gdouble x1, x2, y1, y2;
1641 if (!gdk_event_get_coords (event1, &x1, &y1) ||
1642 !gdk_event_get_coords (event2, &x2, &y2))
1655 * gdk_event_set_screen:
1656 * @event: a #GdkEvent
1657 * @screen: a #GdkScreen
1659 * Sets the screen for @event to @screen. The event must
1660 * have been allocated by GTK+, for instance, by
1666 gdk_event_set_screen (GdkEvent *event,
1669 GdkEventPrivate *private;
1671 g_return_if_fail (gdk_event_is_allocated (event));
1673 private = (GdkEventPrivate *)event;
1675 private->screen = screen;
1679 * gdk_event_get_screen:
1680 * @event: a #GdkEvent
1682 * Returns the screen for the event. The screen is
1683 * typically the screen for <literal>event->any.window</literal>, but
1684 * for events such as mouse events, it is the screen
1685 * where the pointer was when the event occurs -
1686 * that is, the screen which has the root window
1687 * to which <literal>event->motion.x_root</literal> and
1688 * <literal>event->motion.y_root</literal> are relative.
1690 * Return value: (transfer none): the screen for the event
1695 gdk_event_get_screen (const GdkEvent *event)
1697 if (gdk_event_is_allocated (event))
1699 GdkEventPrivate *private = (GdkEventPrivate *)event;
1701 if (private->screen)
1702 return private->screen;
1705 if (event->any.window)
1706 return gdk_window_get_screen (event->any.window);
1712 * gdk_event_get_event_sequence:
1713 * @event: a #GdkEvent
1715 * If @event if of type %GDK_TOUCH_BEGIN, %GDK_TOUCH_UPDATE,
1716 * %GDK_TOUCH_END or %GDK_TOUCH_CANCEL, returns the #GdkEventSequence
1717 * to which the event belongs. Otherwise, return %NULL.
1719 * Returns: the event sequence that the event belongs to
1724 gdk_event_get_event_sequence (const GdkEvent *event)
1733 * gdk_set_show_events:
1734 * @show_events: %TRUE to output event debugging information.
1736 * Sets whether a trace of received events is output.
1737 * Note that GTK+ must be compiled with debugging (that is,
1738 * configured using the <option>--enable-debug</option> option)
1739 * to use this option.
1742 gdk_set_show_events (gboolean show_events)
1745 _gdk_debug_flags |= GDK_DEBUG_EVENTS;
1747 _gdk_debug_flags &= ~GDK_DEBUG_EVENTS;
1751 * gdk_get_show_events:
1753 * Gets whether event debugging output is enabled.
1755 * Return value: %TRUE if event debugging output is enabled.
1758 gdk_get_show_events (void)
1760 return (_gdk_debug_flags & GDK_DEBUG_EVENTS) != 0;
1763 /* What do we do with G_IO_NVAL?
1765 #define READ_CONDITION (G_IO_IN | G_IO_HUP | G_IO_ERR)
1766 #define WRITE_CONDITION (G_IO_OUT | G_IO_ERR)
1767 #define EXCEPTION_CONDITION (G_IO_PRI)
1770 gdk_synthesize_click (GdkDisplay *display,
1774 GdkEvent *event_copy;
1776 event_copy = gdk_event_copy (event);
1777 event_copy->type = (nclicks == 2) ? GDK_2BUTTON_PRESS : GDK_3BUTTON_PRESS;
1779 _gdk_event_queue_append (display, event_copy);
1783 _gdk_event_button_generate (GdkDisplay *display,
1786 GdkMultipleClickInfo *info;
1788 g_return_if_fail (event->type == GDK_BUTTON_PRESS);
1790 info = g_hash_table_lookup (display->multiple_click_info, event->button.device);
1792 if (G_UNLIKELY (!info))
1794 info = g_new0 (GdkMultipleClickInfo, 1);
1795 info->button_number[0] = info->button_number[1] = -1;
1797 g_hash_table_insert (display->multiple_click_info,
1798 event->button.device, info);
1801 if ((event->button.time < (info->button_click_time[1] + 2 * display->double_click_time)) &&
1802 (event->button.window == info->button_window[1]) &&
1803 (event->button.button == info->button_number[1]) &&
1804 (ABS (event->button.x - info->button_x[1]) <= display->double_click_distance) &&
1805 (ABS (event->button.y - info->button_y[1]) <= display->double_click_distance))
1807 gdk_synthesize_click (display, event, 3);
1809 info->button_click_time[1] = 0;
1810 info->button_click_time[0] = 0;
1811 info->button_window[1] = NULL;
1812 info->button_window[0] = NULL;
1813 info->button_number[1] = -1;
1814 info->button_number[0] = -1;
1815 info->button_x[0] = info->button_x[1] = 0;
1816 info->button_y[0] = info->button_y[1] = 0;
1818 else if ((event->button.time < (info->button_click_time[0] + display->double_click_time)) &&
1819 (event->button.window == info->button_window[0]) &&
1820 (event->button.button == info->button_number[0]) &&
1821 (ABS (event->button.x - info->button_x[0]) <= display->double_click_distance) &&
1822 (ABS (event->button.y - info->button_y[0]) <= display->double_click_distance))
1824 gdk_synthesize_click (display, event, 2);
1826 info->button_click_time[1] = info->button_click_time[0];
1827 info->button_click_time[0] = event->button.time;
1828 info->button_window[1] = info->button_window[0];
1829 info->button_window[0] = event->button.window;
1830 info->button_number[1] = info->button_number[0];
1831 info->button_number[0] = event->button.button;
1832 info->button_x[1] = info->button_x[0];
1833 info->button_x[0] = event->button.x;
1834 info->button_y[1] = info->button_y[0];
1835 info->button_y[0] = event->button.y;
1839 info->button_click_time[1] = 0;
1840 info->button_click_time[0] = event->button.time;
1841 info->button_window[1] = NULL;
1842 info->button_window[0] = event->button.window;
1843 info->button_number[1] = -1;
1844 info->button_number[0] = event->button.button;
1845 info->button_x[1] = 0;
1846 info->button_x[0] = event->button.x;
1847 info->button_y[1] = 0;
1848 info->button_y[0] = event->button.y;
1853 gdk_synthesize_window_state (GdkWindow *window,
1854 GdkWindowState unset_flags,
1855 GdkWindowState set_flags)
1857 GdkEvent temp_event;
1860 g_return_if_fail (window != NULL);
1862 temp_event.window_state.window = window;
1863 temp_event.window_state.type = GDK_WINDOW_STATE;
1864 temp_event.window_state.send_event = FALSE;
1866 old = temp_event.window_state.window->state;
1868 temp_event.window_state.new_window_state = old;
1869 temp_event.window_state.new_window_state |= set_flags;
1870 temp_event.window_state.new_window_state &= ~unset_flags;
1871 temp_event.window_state.changed_mask = temp_event.window_state.new_window_state ^ old;
1873 if (temp_event.window_state.new_window_state == old)
1874 return; /* No actual work to do, nothing changed. */
1876 /* Actually update the field in GdkWindow, this is sort of an odd
1877 * place to do it, but seems like the safest since it ensures we expose no
1878 * inconsistent state to the user.
1881 window->state = temp_event.window_state.new_window_state;
1883 if (temp_event.window_state.changed_mask & GDK_WINDOW_STATE_WITHDRAWN)
1884 _gdk_window_update_viewable (window);
1886 /* We only really send the event to toplevels, since
1887 * all the window states don't apply to non-toplevels.
1888 * Non-toplevels do use the GDK_WINDOW_STATE_WITHDRAWN flag
1889 * internally so we needed to update window->state.
1891 switch (window->window_type)
1893 case GDK_WINDOW_TOPLEVEL:
1894 case GDK_WINDOW_TEMP: /* ? */
1895 gdk_display_put_event (gdk_window_get_display (window), &temp_event);
1898 case GDK_WINDOW_FOREIGN:
1899 case GDK_WINDOW_ROOT:
1900 case GDK_WINDOW_CHILD:
1906 * gdk_display_set_double_click_time:
1907 * @display: a #GdkDisplay
1908 * @msec: double click time in milliseconds (thousandths of a second)
1910 * Sets the double click time (two clicks within this time interval
1911 * count as a double click and result in a #GDK_2BUTTON_PRESS event).
1912 * Applications should <emphasis>not</emphasis> set this, it is a global
1913 * user-configured setting.
1918 gdk_display_set_double_click_time (GdkDisplay *display,
1921 display->double_click_time = msec;
1925 * gdk_set_double_click_time:
1926 * @msec: double click time in milliseconds (thousandths of a second)
1928 * Set the double click time for the default display. See
1929 * gdk_display_set_double_click_time().
1930 * See also gdk_display_set_double_click_distance().
1931 * Applications should <emphasis>not</emphasis> set this, it is a
1932 * global user-configured setting.
1935 gdk_set_double_click_time (guint msec)
1937 gdk_display_set_double_click_time (gdk_display_get_default (), msec);
1941 * gdk_display_set_double_click_distance:
1942 * @display: a #GdkDisplay
1943 * @distance: distance in pixels
1945 * Sets the double click distance (two clicks within this distance
1946 * count as a double click and result in a #GDK_2BUTTON_PRESS event).
1947 * See also gdk_display_set_double_click_time().
1948 * Applications should <emphasis>not</emphasis> set this, it is a global
1949 * user-configured setting.
1954 gdk_display_set_double_click_distance (GdkDisplay *display,
1957 display->double_click_distance = distance;
1960 G_DEFINE_BOXED_TYPE (GdkEvent, gdk_event,
1966 * @name: the name of the setting.
1967 * @value: location to store the value of the setting.
1969 * Obtains a desktop-wide setting, such as the double-click time,
1970 * for the default screen. See gdk_screen_get_setting().
1972 * Returns: %TRUE if the setting existed and a value was stored
1973 * in @value, %FALSE otherwise.
1976 gdk_setting_get (const gchar *name,
1979 return gdk_screen_get_setting (gdk_screen_get_default (), name, value);