1 /* GAIL - The GNOME Accessibility Implementation Library
2 * Copyright 2001 Sun Microsystems Inc.
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, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
26 #include "gailbooleancell.h"
27 #include "gailbutton.h"
29 #include "gailcontainer.h"
30 #include "gailcontainercell.h"
31 #include "gailimagecell.h"
33 #include "gailmenushell.h"
34 #include "gailrenderercell.h"
35 #include "gailtextcell.h"
36 #include "gailtoplevel.h"
38 #include "gailwidget.h"
39 #include "gailwindow.h"
41 #include "gailfactory.h"
43 #define GNOME_ACCESSIBILITY_ENV "GNOME_ACCESSIBILITY"
45 static gboolean gail_focus_watcher (GSignalInvocationHint *ihint,
47 const GValue *param_values,
49 static gboolean gail_select_watcher (GSignalInvocationHint *ihint,
51 const GValue *param_values,
53 static gboolean gail_deselect_watcher (GSignalInvocationHint *ihint,
55 const GValue *param_values,
57 static gboolean gail_switch_page_watcher(GSignalInvocationHint *ihint,
59 const GValue *param_values,
61 static void gail_finish_select (GtkWidget *widget);
62 static void gail_map_cb (GtkWidget *widget);
63 static void gail_map_submenu_cb (GtkWidget *widget);
64 static gint gail_focus_idle_handler (gpointer data);
65 static void gail_focus_notify (GtkWidget *widget);
66 static void gail_focus_notify_when_idle (GtkWidget *widget);
68 static void gail_focus_tracker_init (void);
69 static void gail_focus_object_destroyed (gpointer data);
70 static void gail_focus_tracker (AtkObject *object);
71 static void gail_set_focus_widget (GtkWidget *focus_widget,
73 static void gail_set_focus_object (AtkObject *focus_obj,
76 GtkWidget* focus_widget = NULL;
77 static GtkWidget* next_focus_widget = NULL;
78 static gboolean was_deselect = FALSE;
79 static GtkWidget* subsequent_focus_widget = NULL;
80 static GtkWidget* focus_before_menu = NULL;
81 static guint focus_notify_handler = 0;
82 static guint focus_tracker_id = 0;
83 static GQuark quark_focus_object = 0;
85 GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_WIDGET, GailWidget, gail_widget, GTK_TYPE_WIDGET)
86 GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_CONTAINER, GailContainer, gail_container, GTK_TYPE_CONTAINER)
87 GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_BUTTON, GailButton, gail_button, GTK_TYPE_BUTTON)
88 GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_MENU_SHELL, GailMenuShell, gail_menu_shell, GTK_TYPE_MENU_SHELL)
89 GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_MENU, GailMenu, gail_menu, GTK_TYPE_MENU)
90 GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_WINDOW, GailWindow, gail_window, GTK_TYPE_BIN)
91 GAIL_IMPLEMENT_FACTORY_WITH_FUNC_DUMMY (GAIL_TYPE_RENDERER_CELL, GailRendererCell, gail_renderer_cell, GTK_TYPE_CELL_RENDERER, gail_renderer_cell_new)
92 GAIL_IMPLEMENT_FACTORY_WITH_FUNC_DUMMY (GAIL_TYPE_BOOLEAN_CELL, GailBooleanCell, gail_boolean_cell, GTK_TYPE_CELL_RENDERER_TOGGLE, gail_boolean_cell_new)
93 GAIL_IMPLEMENT_FACTORY_WITH_FUNC_DUMMY (GAIL_TYPE_IMAGE_CELL, GailImageCell, gail_image_cell, GTK_TYPE_CELL_RENDERER_PIXBUF, gail_image_cell_new)
94 GAIL_IMPLEMENT_FACTORY_WITH_FUNC_DUMMY (GAIL_TYPE_TEXT_CELL, GailTextCell, gail_text_cell, GTK_TYPE_CELL_RENDERER_TEXT, gail_text_cell_new)
97 gail_get_accessible_for_widget (GtkWidget *widget,
100 AtkObject *obj = NULL;
106 if (GTK_IS_ENTRY (widget))
108 else if (GTK_IS_NOTEBOOK (widget))
110 GtkNotebook *notebook;
113 notebook = GTK_NOTEBOOK (widget);
114 page_num = gtk_notebook_get_current_page (notebook);
117 obj = gtk_widget_get_accessible (widget);
118 obj = atk_object_ref_accessible_child (obj, page_num);
119 g_object_unref (obj);
122 else if (GTK_IS_TOGGLE_BUTTON (widget))
124 GtkWidget *other_widget = gtk_widget_get_parent (widget);
125 if (GTK_IS_COMBO_BOX (other_widget))
127 gail_set_focus_widget (other_widget, widget);
128 widget = other_widget;
133 AtkObject *focus_object;
135 obj = gtk_widget_get_accessible (widget);
136 focus_object = g_object_get_qdata (G_OBJECT (obj), quark_focus_object);
138 * We check whether the object for this focus_object has been deleted.
139 * This can happen when navigating to an empty directory in nautilus.
142 if (ATK_IS_GOBJECT_ACCESSIBLE (focus_object))
144 if (!atk_gobject_accessible_get_object (ATK_GOBJECT_ACCESSIBLE (focus_object)))
155 gail_focus_watcher (GSignalInvocationHint *ihint,
156 guint n_param_values,
157 const GValue *param_values,
164 object = g_value_get_object (param_values + 0);
165 g_return_val_if_fail (GTK_IS_WIDGET(object), FALSE);
167 event = g_value_get_boxed (param_values + 1);
168 widget = GTK_WIDGET (object);
170 if (event->type == GDK_FOCUS_CHANGE)
172 if (event->focus_change.in)
174 if (GTK_IS_WINDOW (widget))
176 GtkWidget *focus_widget;
180 window = GTK_WINDOW (widget);
181 focus_widget = gtk_window_get_focus (window);
182 g_object_get (window, "type", &type, NULL);
187 * If we already have a potential focus widget set this
188 * windows's focus widget to focus_before_menu so that
189 * it will be reported when menu item is unset.
191 if (next_focus_widget)
193 if (GTK_IS_MENU_ITEM (next_focus_widget) &&
196 void *vp_focus_before_menu = &focus_before_menu;
197 focus_before_menu = focus_widget;
198 g_object_add_weak_pointer (G_OBJECT (focus_before_menu), vp_focus_before_menu);
203 widget = focus_widget;
205 else if (type == GTK_WINDOW_POPUP)
207 if (GTK_IS_BIN (widget))
209 GtkWidget *child = gtk_bin_get_child (GTK_BIN (widget));
211 if (GTK_IS_WIDGET (child) && gtk_widget_has_grab (child))
213 if (GTK_IS_MENU_SHELL (child))
215 if (gtk_menu_shell_get_selected_item (GTK_MENU_SHELL (child)))
218 * We have a menu which has a menu item selected
219 * so we do not report focus on the menu.
227 else /* popup window has no children; this edge case occurs in some custom code (OOo for instance) */
232 else /* Widget is a non-popup toplevel with no focus children;
233 don't emit for this case either, as it's useless */
241 if (next_focus_widget)
245 toplevel = gtk_widget_get_toplevel (next_focus_widget);
246 if (toplevel == widget)
247 next_focus_widget = NULL;
255 if (event->type == GDK_MOTION_NOTIFY && gtk_widget_has_focus (widget))
257 if (widget == focus_widget)
268 #ifdef GDK_WINDOWING_X11
270 * If the focus widget is a GtkSocket without a plug
271 * then ignore the focus notification as the embedded
272 * plug will report a focus notification.
274 if (GTK_IS_SOCKET (widget) &&
275 gtk_socket_get_plug_window (GTK_SOCKET (widget)) != NULL)
280 * The widget may not yet be visible on the screen so we wait until it is.
282 gail_focus_notify_when_idle (widget);
287 gail_select_watcher (GSignalInvocationHint *ihint,
288 guint n_param_values,
289 const GValue *param_values,
295 object = g_value_get_object (param_values + 0);
296 g_return_val_if_fail (GTK_IS_WIDGET(object), FALSE);
298 widget = GTK_WIDGET (object);
300 if (!gtk_widget_get_mapped (widget))
302 g_signal_connect (widget, "map",
303 G_CALLBACK (gail_map_cb),
307 gail_finish_select (widget);
313 gail_finish_select (GtkWidget *widget)
315 if (GTK_IS_MENU_ITEM (widget))
317 GtkMenuItem* menu_item;
320 menu_item = GTK_MENU_ITEM (widget);
321 submenu = gtk_menu_item_get_submenu (menu_item);
323 !gtk_widget_get_mapped (submenu))
326 * If the submenu is not visble, wait until it is before
327 * reporting focus on the menu item.
331 handler_id = g_signal_handler_find (submenu,
333 g_signal_lookup ("map",
337 (gpointer) gail_map_submenu_cb,
340 g_signal_connect (submenu, "map",
341 G_CALLBACK (gail_map_submenu_cb),
346 * If we are waiting to report focus on a menubar or a menu item
347 * because of a previous deselect, cancel it.
350 focus_notify_handler &&
352 (GTK_IS_MENU_BAR (next_focus_widget) ||
353 GTK_IS_MENU_ITEM (next_focus_widget)))
355 void *vp_next_focus_widget = &next_focus_widget;
356 g_source_remove (focus_notify_handler);
357 g_object_remove_weak_pointer (G_OBJECT (next_focus_widget), vp_next_focus_widget);
358 next_focus_widget = NULL;
359 focus_notify_handler = 0;
360 was_deselect = FALSE;
364 * If previously focused widget is not a GtkMenuItem or a GtkMenu,
365 * keep track of it so we can return to it after menubar is deactivated
368 !GTK_IS_MENU_ITEM (focus_widget) &&
369 !GTK_IS_MENU (focus_widget))
371 void *vp_focus_before_menu = &focus_before_menu;
372 focus_before_menu = focus_widget;
373 g_object_add_weak_pointer (G_OBJECT (focus_before_menu), vp_focus_before_menu);
376 gail_focus_notify_when_idle (widget);
382 gail_map_cb (GtkWidget *widget)
384 gail_finish_select (widget);
388 gail_map_submenu_cb (GtkWidget *widget)
390 if (GTK_IS_MENU (widget))
392 GtkWidget *parent_menu_item;
394 parent_menu_item = gtk_menu_get_attach_widget (GTK_MENU (widget));
395 if (parent_menu_item)
396 gail_finish_select (parent_menu_item);
402 gail_deselect_watcher (GSignalInvocationHint *ihint,
403 guint n_param_values,
404 const GValue *param_values,
409 GtkWidget *menu_shell;
411 object = g_value_get_object (param_values + 0);
412 g_return_val_if_fail (GTK_IS_WIDGET(object), FALSE);
414 widget = GTK_WIDGET (object);
416 if (!GTK_IS_MENU_ITEM (widget))
419 if (subsequent_focus_widget == widget)
420 subsequent_focus_widget = NULL;
422 menu_shell = gtk_widget_get_parent (widget);
423 if (GTK_IS_MENU_SHELL (menu_shell))
425 GtkWidget *parent_menu_shell;
427 parent_menu_shell = gtk_menu_shell_get_parent_shell (GTK_MENU_SHELL (menu_shell));
428 if (parent_menu_shell)
430 GtkWidget *active_menu_item;
432 active_menu_item = gtk_menu_shell_get_selected_item (GTK_MENU_SHELL (parent_menu_shell));
433 if (active_menu_item)
435 gail_focus_notify_when_idle (active_menu_item);
440 if (!GTK_IS_MENU_BAR (menu_shell))
442 gail_focus_notify_when_idle (menu_shell);
451 gail_switch_page_watcher (GSignalInvocationHint *ihint,
452 guint n_param_values,
453 const GValue *param_values,
459 object = g_value_get_object (param_values + 0);
460 g_return_val_if_fail (GTK_IS_WIDGET(object), FALSE);
462 widget = GTK_WIDGET (object);
464 if (!GTK_IS_NOTEBOOK (widget))
467 if (gtk_notebook_get_current_page (GTK_NOTEBOOK (widget)) == -1)
470 gail_focus_notify_when_idle (widget);
475 gail_focus_idle_handler (gpointer data)
477 focus_notify_handler = 0;
479 * The widget which was to receive focus may have been removed
481 if (!next_focus_widget)
483 if (next_focus_widget != data)
488 void *vp_next_focus_widget = &next_focus_widget;
489 g_object_remove_weak_pointer (G_OBJECT (next_focus_widget), vp_next_focus_widget);
490 next_focus_widget = NULL;
493 gail_focus_notify (data);
499 gail_focus_notify (GtkWidget *widget)
504 if (widget != focus_widget)
508 void *vp_focus_widget = &focus_widget;
509 g_object_remove_weak_pointer (G_OBJECT (focus_widget), vp_focus_widget);
511 focus_widget = widget;
514 void *vp_focus_widget = &focus_widget;
515 g_object_add_weak_pointer (G_OBJECT (focus_widget), vp_focus_widget);
517 * The UI may not have been updated yet; e.g. in gtkhtml2
518 * html_view_layout() is called in a idle handler
520 if (focus_widget == focus_before_menu)
522 void *vp_focus_before_menu = &focus_before_menu;
523 g_object_remove_weak_pointer (G_OBJECT (focus_before_menu), vp_focus_before_menu);
524 focus_before_menu = NULL;
527 gail_focus_notify_when_idle (focus_widget);
532 atk_obj = gail_get_accessible_for_widget (focus_widget, &transient);
536 * Do not report focus on redundant object
539 (atk_object_get_role(atk_obj) != ATK_ROLE_REDUNDANT_OBJECT))
540 atk_focus_tracker_notify (atk_obj);
541 if (atk_obj && transient)
542 g_object_unref (atk_obj);
543 if (subsequent_focus_widget)
545 GtkWidget *tmp_widget = subsequent_focus_widget;
546 subsequent_focus_widget = NULL;
547 gail_focus_notify_when_idle (tmp_widget);
553 gail_focus_notify_when_idle (GtkWidget *widget)
555 if (focus_notify_handler)
560 * Ignore focus request when menu item is going to be focused.
563 if (GTK_IS_MENU_ITEM (next_focus_widget) && !GTK_IS_MENU_ITEM (widget))
566 if (next_focus_widget)
568 if (GTK_IS_MENU_ITEM (next_focus_widget) && GTK_IS_MENU_ITEM (widget))
570 if (gtk_menu_item_get_submenu (GTK_MENU_ITEM (next_focus_widget)) == gtk_widget_get_parent (widget))
572 if (subsequent_focus_widget)
573 g_assert_not_reached ();
574 subsequent_focus_widget = widget;
579 g_source_remove (focus_notify_handler);
580 if (next_focus_widget)
582 void *vp_next_focus_widget = &next_focus_widget;
583 g_object_remove_weak_pointer (G_OBJECT (next_focus_widget), vp_next_focus_widget);
584 next_focus_widget = NULL;
589 * Ignore if focus is being set to NULL and we are waiting to set focus
596 void *vp_next_focus_widget = &next_focus_widget;
597 next_focus_widget = widget;
598 g_object_add_weak_pointer (G_OBJECT (next_focus_widget), vp_next_focus_widget);
603 * We are about to report focus as NULL so remove the weak pointer
604 * for the widget we were waiting to report focus on.
606 if (next_focus_widget)
608 void *vp_next_focus_widget = &next_focus_widget;
609 g_object_remove_weak_pointer (G_OBJECT (next_focus_widget), vp_next_focus_widget);
610 next_focus_widget = NULL;
614 focus_notify_handler = gdk_threads_add_idle (gail_focus_idle_handler, widget);
618 gail_deactivate_watcher (GSignalInvocationHint *ihint,
619 guint n_param_values,
620 const GValue *param_values,
626 GtkWidget *focus = NULL;
628 object = g_value_get_object (param_values + 0);
629 g_return_val_if_fail (GTK_IS_WIDGET(object), FALSE);
630 widget = GTK_WIDGET (object);
632 g_return_val_if_fail (GTK_IS_MENU_SHELL(widget), TRUE);
633 shell = GTK_MENU_SHELL(widget);
634 if (! gtk_menu_shell_get_parent_shell (shell))
635 focus = focus_before_menu;
638 * If we are waiting to report focus on a menubar or a menu item
639 * because of a previous deselect, cancel it.
642 focus_notify_handler &&
644 (GTK_IS_MENU_BAR (next_focus_widget) ||
645 GTK_IS_MENU_ITEM (next_focus_widget)))
647 void *vp_next_focus_widget = &next_focus_widget;
648 g_source_remove (focus_notify_handler);
649 g_object_remove_weak_pointer (G_OBJECT (next_focus_widget), vp_next_focus_widget);
650 next_focus_widget = NULL;
651 focus_notify_handler = 0;
652 was_deselect = FALSE;
654 gail_focus_notify_when_idle (focus);
660 gail_focus_tracker_init (void)
662 static gboolean emission_hooks_added = FALSE;
664 if (!emission_hooks_added)
667 * We cannot be sure that the classes exist so we make sure that they do.
669 g_type_class_ref (GTK_TYPE_WIDGET);
670 g_type_class_ref (GTK_TYPE_MENU_ITEM);
671 g_type_class_ref (GTK_TYPE_MENU_SHELL);
672 g_type_class_ref (GTK_TYPE_NOTEBOOK);
675 * We listen for event_after signal and then check that the
676 * event was a focus in event so we get called after the event.
678 g_signal_add_emission_hook (
679 g_signal_lookup ("event-after", GTK_TYPE_WIDGET), 0,
680 gail_focus_watcher, NULL, (GDestroyNotify) NULL);
682 * A "select" signal is emitted when arrow key is used to
683 * move to a list item in the popup window of a GtkCombo or
684 * a menu item in a menu.
686 g_signal_add_emission_hook (
687 g_signal_lookup ("select", GTK_TYPE_MENU_ITEM), 0,
688 gail_select_watcher, NULL, (GDestroyNotify) NULL);
691 * A "deselect" signal is emitted when arrow key is used to
692 * move from a menu item in a menu to the parent menu.
694 g_signal_add_emission_hook (
695 g_signal_lookup ("deselect", GTK_TYPE_MENU_ITEM), 0,
696 gail_deselect_watcher, NULL, (GDestroyNotify) NULL);
699 * We listen for deactivate signals on menushells to determine
700 * when the "focus" has left the menus.
702 g_signal_add_emission_hook (
703 g_signal_lookup ("deactivate", GTK_TYPE_MENU_SHELL), 0,
704 gail_deactivate_watcher, NULL, (GDestroyNotify) NULL);
707 * We listen for "switch-page" signal on a GtkNotebook to notify
708 * when page has changed because of clicking on a notebook tab.
710 g_signal_add_emission_hook (
711 g_signal_lookup ("switch-page", GTK_TYPE_NOTEBOOK), 0,
712 gail_switch_page_watcher, NULL, (GDestroyNotify) NULL);
713 emission_hooks_added = TRUE;
718 gail_focus_object_destroyed (gpointer data)
722 obj = G_OBJECT (data);
723 g_object_set_qdata (obj, quark_focus_object, NULL);
724 g_object_unref (obj);
728 gail_focus_tracker (AtkObject *focus_object)
731 * Do not report focus on redundant object
734 (atk_object_get_role(focus_object) != ATK_ROLE_REDUNDANT_OBJECT))
736 AtkObject *old_focus_object;
738 if (!GTK_IS_ACCESSIBLE (focus_object))
742 parent = focus_object;
745 parent = atk_object_get_parent (parent);
748 if (GTK_IS_ACCESSIBLE (parent))
754 gail_set_focus_object (focus_object, parent);
759 old_focus_object = g_object_get_qdata (G_OBJECT (focus_object), quark_focus_object);
760 if (old_focus_object)
762 g_object_weak_unref (G_OBJECT (old_focus_object),
763 (GWeakNotify) gail_focus_object_destroyed,
765 g_object_set_qdata (G_OBJECT (focus_object), quark_focus_object, NULL);
766 g_object_unref (G_OBJECT (focus_object));
773 gail_set_focus_widget (GtkWidget *focus_widget,
776 AtkObject *focus_obj;
779 focus_obj = gtk_widget_get_accessible (focus_widget);
780 obj = gtk_widget_get_accessible (widget);
781 gail_set_focus_object (focus_obj, obj);
785 gail_set_focus_object (AtkObject *focus_obj,
788 AtkObject *old_focus_obj;
790 old_focus_obj = g_object_get_qdata (G_OBJECT (obj), quark_focus_object);
791 if (old_focus_obj != obj)
794 g_object_weak_unref (G_OBJECT (old_focus_obj),
795 (GWeakNotify) gail_focus_object_destroyed,
799 * We call g_object_ref as if obj is destroyed
800 * while the weak reference exists then destroying the
801 * focus_obj would cause gail_focus_object_destroyed to be
802 * called when obj is not a valid GObject.
806 g_object_weak_ref (G_OBJECT (focus_obj),
807 (GWeakNotify) gail_focus_object_destroyed,
809 g_object_set_qdata (G_OBJECT (obj), quark_focus_object, focus_obj);
813 static int gail_initialized = FALSE;
816 gail_accessibility_module_init (void)
818 const char *env_a_t_support;
819 gboolean a_t_support = FALSE;
821 if (gail_initialized)
825 gail_initialized = TRUE;
826 quark_focus_object = g_quark_from_static_string ("gail-focus-object");
828 env_a_t_support = g_getenv (GNOME_ACCESSIBILITY_ENV);
831 a_t_support = atoi (env_a_t_support);
833 fprintf (stderr, "GTK Accessibility Module initialized\n");
835 GAIL_WIDGET_SET_FACTORY (GTK_TYPE_WIDGET, gail_widget);
836 GAIL_WIDGET_SET_FACTORY (GTK_TYPE_CONTAINER, gail_container);
837 GAIL_WIDGET_SET_FACTORY (GTK_TYPE_BUTTON, gail_button);
838 GAIL_WIDGET_SET_FACTORY (GTK_TYPE_MENU_BAR, gail_menu_shell);
839 GAIL_WIDGET_SET_FACTORY (GTK_TYPE_MENU, gail_menu);
840 GAIL_WIDGET_SET_FACTORY (GTK_TYPE_WINDOW, gail_window);
841 GAIL_WIDGET_SET_FACTORY (GTK_TYPE_CELL_RENDERER_TEXT, gail_text_cell);
842 GAIL_WIDGET_SET_FACTORY (GTK_TYPE_CELL_RENDERER_TOGGLE, gail_boolean_cell);
843 GAIL_WIDGET_SET_FACTORY (GTK_TYPE_CELL_RENDERER_PIXBUF, gail_image_cell);
844 GAIL_WIDGET_SET_FACTORY (GTK_TYPE_CELL_RENDERER, gail_renderer_cell);
846 atk_focus_tracker_init (gail_focus_tracker_init);
847 focus_tracker_id = atk_add_focus_tracker (gail_focus_tracker);
849 /* Initialize the GailUtility class */
850 g_type_class_unref (g_type_class_ref (GAIL_TYPE_UTIL));
851 g_type_class_unref (g_type_class_ref (GAIL_TYPE_MISC));