/* GAIL - The GNOME Accessibility Implementation Library * Copyright 2001 Sun Microsystems Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #include "config.h" #include #include #undef GTK_DISABLE_DEPRECATED #include #include "gail.h" #include "gailfactory.h" #define GNOME_ACCESSIBILITY_ENV "GNOME_ACCESSIBILITY" #define NO_GAIL_ENV "NO_GAIL" static gboolean gail_focus_watcher (GSignalInvocationHint *ihint, guint n_param_values, const GValue *param_values, gpointer data); static gboolean gail_select_watcher (GSignalInvocationHint *ihint, guint n_param_values, const GValue *param_values, gpointer data); static gboolean gail_deselect_watcher (GSignalInvocationHint *ihint, guint n_param_values, const GValue *param_values, gpointer data); static gboolean gail_switch_page_watcher(GSignalInvocationHint *ihint, guint n_param_values, const GValue *param_values, gpointer data); static AtkObject* gail_get_accessible_for_widget (GtkWidget *widget, gboolean *transient); static void gail_finish_select (GtkWidget *widget); static void gail_map_cb (GtkWidget *widget); static void gail_map_submenu_cb (GtkWidget *widget); static gint gail_focus_idle_handler (gpointer data); static void gail_focus_notify (GtkWidget *widget); static void gail_focus_notify_when_idle (GtkWidget *widget); static void gail_focus_tracker_init (void); static void gail_focus_object_destroyed (gpointer data); static void gail_focus_tracker (AtkObject *object); static void gail_set_focus_widget (GtkWidget *focus_widget, GtkWidget *widget); static void gail_set_focus_object (AtkObject *focus_obj, AtkObject *obj); GtkWidget* focus_widget = NULL; static GtkWidget* next_focus_widget = NULL; static gboolean was_deselect = FALSE; static GtkWidget* subsequent_focus_widget = NULL; static GtkWidget* focus_before_menu = NULL; static guint focus_notify_handler = 0; static guint focus_tracker_id = 0; static GQuark quark_focus_object = 0; GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_OBJECT, GailObject, gail_object, GTK_TYPE_OBJECT) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_WIDGET, GailWidget, gail_widget, GTK_TYPE_WIDGET) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_CONTAINER, GailContainer, gail_container, GTK_TYPE_CONTAINER) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_BUTTON, GailButton, gail_button, GTK_TYPE_BUTTON) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_ITEM, GailItem, gail_item, GTK_TYPE_ITEM) GAIL_IMPLEMENT_FACTORY_WITH_FUNC (GAIL_TYPE_MENU_ITEM, GailMenuItem, gail_menu_item, gail_menu_item_new) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_TOGGLE_BUTTON, GailToggleButton, gail_toggle_button, GTK_TYPE_TOGGLE_BUTTON) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_IMAGE, GailImage, gail_image, GTK_TYPE_IMAGE) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_TEXT_VIEW, GailTextView, gail_text_view, GTK_TYPE_TEXT_VIEW) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_COMBO, GailCombo, gail_combo, GTK_TYPE_COMBO) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_COMBO_BOX, GailComboBox, gail_combo_box, GTK_TYPE_COMBO_BOX) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_ENTRY, GailEntry, gail_entry, GTK_TYPE_ENTRY) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_MENU_SHELL, GailMenuShell, gail_menu_shell, GTK_TYPE_MENU_SHELL) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_MENU, GailMenu, gail_menu, GTK_TYPE_MENU) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_WINDOW, GailWindow, gail_window, GTK_TYPE_BIN) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_RANGE, GailRange, gail_range, GTK_TYPE_RANGE) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_SCALE, GailScale, gail_scale, GTK_TYPE_SCALE) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_SCALE_BUTTON, GailScaleButton, gail_scale_button, GTK_TYPE_SCALE_BUTTON) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_CLIST, GailCList, gail_clist, GTK_TYPE_CLIST) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_LABEL, GailLabel, gail_label, GTK_TYPE_LABEL) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_STATUSBAR, GailStatusbar, gail_statusbar, GTK_TYPE_STATUSBAR) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_NOTEBOOK, GailNotebook, gail_notebook, GTK_TYPE_NOTEBOOK) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_CALENDAR, GailCalendar, gail_calendar, GTK_TYPE_CALENDAR) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_PROGRESS_BAR, GailProgressBar, gail_progress_bar, GTK_TYPE_PROGRESS_BAR) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_SPIN_BUTTON, GailSpinButton, gail_spin_button, GTK_TYPE_SPIN_BUTTON) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_TREE_VIEW, GailTreeView, gail_tree_view, GTK_TYPE_TREE_VIEW) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_FRAME, GailFrame, gail_frame, GTK_TYPE_FRAME) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_RADIO_BUTTON, GailRadioButton, gail_radio_button, GTK_TYPE_RADIO_BUTTON) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_ARROW, GailArrow, gail_arrow, GTK_TYPE_ARROW) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_PIXMAP, GailPixmap, gail_pixmap, GTK_TYPE_PIXMAP) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_SEPARATOR, GailSeparator, gail_separator, GTK_TYPE_SEPARATOR) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_BOX, GailBox, gail_box, GTK_TYPE_BOX) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_SCROLLED_WINDOW, GailScrolledWindow, gail_scrolled_window, GTK_TYPE_SCROLLED_WINDOW) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_LIST, GailList, gail_list, GTK_TYPE_LIST) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_PANED, GailPaned, gail_paned, GTK_TYPE_PANED) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_SCROLLBAR, GailScrollbar, gail_scrollbar, GTK_TYPE_SCROLLBAR) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_OPTION_MENU, GailOptionMenu, gail_option_menu, GTK_TYPE_OPTION_MENU) GAIL_IMPLEMENT_FACTORY_WITH_FUNC (GAIL_TYPE_CHECK_MENU_ITEM, GailCheckMenuItem, gail_check_menu_item, gail_check_menu_item_new) GAIL_IMPLEMENT_FACTORY_WITH_FUNC (GAIL_TYPE_RADIO_MENU_ITEM, GailRadioMenuItem, gail_radio_menu_item, gail_radio_menu_item_new) GAIL_IMPLEMENT_FACTORY (GAIL_TYPE_EXPANDER, GailExpander, gail_expander, GTK_TYPE_EXPANDER) GAIL_IMPLEMENT_FACTORY_WITH_FUNC_DUMMY (GAIL_TYPE_RENDERER_CELL, GailRendererCell, gail_renderer_cell, GTK_TYPE_CELL_RENDERER, gail_renderer_cell_new) GAIL_IMPLEMENT_FACTORY_WITH_FUNC_DUMMY (GAIL_TYPE_BOOLEAN_CELL, GailBooleanCell, gail_boolean_cell, GTK_TYPE_CELL_RENDERER_TOGGLE, gail_boolean_cell_new) GAIL_IMPLEMENT_FACTORY_WITH_FUNC_DUMMY (GAIL_TYPE_IMAGE_CELL, GailImageCell, gail_image_cell, GTK_TYPE_CELL_RENDERER_PIXBUF, gail_image_cell_new) GAIL_IMPLEMENT_FACTORY_WITH_FUNC_DUMMY (GAIL_TYPE_TEXT_CELL, GailTextCell, gail_text_cell, GTK_TYPE_CELL_RENDERER_TEXT, gail_text_cell_new) static AtkObject* gail_get_accessible_for_widget (GtkWidget *widget, gboolean *transient) { AtkObject *obj = NULL; GType gnome_canvas; gnome_canvas = g_type_from_name ("GnomeCanvas"); *transient = FALSE; if (!widget) return NULL; if (GTK_IS_ENTRY (widget)) { GtkWidget *other_widget = widget->parent; if (GTK_IS_COMBO (other_widget)) { gail_set_focus_widget (other_widget, widget); widget = other_widget; } } else if (GTK_IS_NOTEBOOK (widget)) { GtkNotebook *notebook; gint page_num = -1; notebook = GTK_NOTEBOOK (widget); /* * Report the currently focused tab rather than the currently selected tab */ if (notebook->focus_tab) { page_num = g_list_index (notebook->children, notebook->focus_tab->data); } if (page_num != -1) { obj = gtk_widget_get_accessible (widget); obj = atk_object_ref_accessible_child (obj, page_num); g_object_unref (obj); } } else if (GTK_CHECK_TYPE ((widget), gnome_canvas)) { GObject *focused_item; GValue value = {0, }; g_value_init (&value, G_TYPE_OBJECT); g_object_get_property (G_OBJECT (widget), "focused_item", &value); focused_item = g_value_get_object (&value); if (focused_item) { AtkObject *tmp; obj = atk_gobject_accessible_for_object (G_OBJECT (focused_item)); tmp = g_object_get_qdata (G_OBJECT (obj), quark_focus_object); if (tmp != NULL) obj = tmp; } } else if (GTK_IS_TOGGLE_BUTTON (widget)) { GtkWidget *other_widget = widget->parent; if (GTK_IS_COMBO_BOX (other_widget)) { gail_set_focus_widget (other_widget, widget); widget = other_widget; } } if (obj == NULL) { AtkObject *focus_object; obj = gtk_widget_get_accessible (widget); focus_object = g_object_get_qdata (G_OBJECT (obj), quark_focus_object); /* * We check whether the object for this focus_object has been deleted. * This can happen when navigating to an empty directory in nautilus. * See bug #141907. */ if (ATK_IS_GOBJECT_ACCESSIBLE (focus_object)) { if (!atk_gobject_accessible_get_object (ATK_GOBJECT_ACCESSIBLE (focus_object))) focus_object = NULL; } if (focus_object) obj = focus_object; } return obj; } static gboolean gail_focus_watcher (GSignalInvocationHint *ihint, guint n_param_values, const GValue *param_values, gpointer data) { GObject *object; GtkWidget *widget; GdkEvent *event; object = g_value_get_object (param_values + 0); g_return_val_if_fail (GTK_IS_WIDGET(object), FALSE); event = g_value_get_boxed (param_values + 1); widget = GTK_WIDGET (object); if (event->type == GDK_FOCUS_CHANGE) { if (event->focus_change.in) { if (GTK_IS_WINDOW (widget)) { GtkWindow *window; window = GTK_WINDOW (widget); if (window->focus_widget) { /* * If we already have a potential focus widget set this * windows's focus widget to focus_before_menu so that * it will be reported when menu item is unset. */ if (next_focus_widget) { if (GTK_IS_MENU_ITEM (next_focus_widget) && !focus_before_menu) { void *vp_focus_before_menu = &focus_before_menu; focus_before_menu = window->focus_widget; g_object_add_weak_pointer (G_OBJECT (focus_before_menu), vp_focus_before_menu); } return TRUE; } widget = window->focus_widget; } else if (window->type == GTK_WINDOW_POPUP) { if (GTK_IS_BIN (widget)) { GtkWidget *child = gtk_bin_get_child (GTK_BIN (widget)); if (GTK_IS_WIDGET (child) && GTK_WIDGET_HAS_GRAB (child)) { if (GTK_IS_MENU_SHELL (child)) { if (GTK_MENU_SHELL (child)->active_menu_item) { /* * We have a menu which has a menu item selected * so we do not report focus on the menu. */ return TRUE; } } widget = child; } } else /* popup window has no children; this edge case occurs in some custom code (OOo for instance) */ { return TRUE; } } else /* Widget is a non-popup toplevel with no focus children; don't emit for this case either, as it's useless */ { return TRUE; } } } else { if (next_focus_widget) { GtkWidget *toplevel; toplevel = gtk_widget_get_toplevel (next_focus_widget); if (toplevel == widget) next_focus_widget = NULL; } /* focus out */ widget = NULL; } } else { if (event->type == GDK_MOTION_NOTIFY && GTK_WIDGET_HAS_FOCUS (widget)) { if (widget == focus_widget) { return TRUE; } } else { return TRUE; } } /* * If the focus widget is a GtkSocket without a plug * then ignore the focus notification as the embedded * plug will report a focus notification. */ if (GTK_IS_SOCKET (widget) && GTK_SOCKET (widget)->plug_widget == NULL) return TRUE; /* * The widget may not yet be visible on the screen so we wait until it is. */ gail_focus_notify_when_idle (widget); return TRUE; } static gboolean gail_select_watcher (GSignalInvocationHint *ihint, guint n_param_values, const GValue *param_values, gpointer data) { GObject *object; GtkWidget *widget; object = g_value_get_object (param_values + 0); g_return_val_if_fail (GTK_IS_WIDGET(object), FALSE); widget = GTK_WIDGET (object); if (!GTK_WIDGET_MAPPED (widget)) { g_signal_connect (widget, "map", G_CALLBACK (gail_map_cb), NULL); } else gail_finish_select (widget); return TRUE; } static void gail_finish_select (GtkWidget *widget) { if (GTK_IS_MENU_ITEM (widget)) { GtkMenuItem* menu_item; menu_item = GTK_MENU_ITEM (widget); if (menu_item->submenu && !GTK_WIDGET_MAPPED (menu_item->submenu)) { /* * If the submenu is not visble, wait until it is before * reporting focus on the menu item. */ gulong handler_id; handler_id = g_signal_handler_find (menu_item->submenu, G_SIGNAL_MATCH_FUNC, g_signal_lookup ("map", GTK_TYPE_WINDOW), 0, NULL, (gpointer) gail_map_submenu_cb, NULL); if (!handler_id) g_signal_connect (menu_item->submenu, "map", G_CALLBACK (gail_map_submenu_cb), NULL); return; } /* * If we are waiting to report focus on a menubar or a menu item * because of a previous deselect, cancel it. */ if (was_deselect && focus_notify_handler && next_focus_widget && (GTK_IS_MENU_BAR (next_focus_widget) || GTK_IS_MENU_ITEM (next_focus_widget))) { void *vp_next_focus_widget = &next_focus_widget; g_source_remove (focus_notify_handler); g_object_remove_weak_pointer (G_OBJECT (next_focus_widget), vp_next_focus_widget); next_focus_widget = NULL; focus_notify_handler = 0; was_deselect = FALSE; } } /* * If previously focused widget is not a GtkMenuItem or a GtkMenu, * keep track of it so we can return to it after menubar is deactivated */ if (focus_widget && !GTK_IS_MENU_ITEM (focus_widget) && !GTK_IS_MENU (focus_widget)) { void *vp_focus_before_menu = &focus_before_menu; focus_before_menu = focus_widget; g_object_add_weak_pointer (G_OBJECT (focus_before_menu), vp_focus_before_menu); } gail_focus_notify_when_idle (widget); return; } static void gail_map_cb (GtkWidget *widget) { gail_finish_select (widget); } static void gail_map_submenu_cb (GtkWidget *widget) { if (GTK_IS_MENU (widget)) { if (GTK_MENU (widget)->parent_menu_item) gail_finish_select (GTK_MENU (widget)->parent_menu_item); } } static gboolean gail_deselect_watcher (GSignalInvocationHint *ihint, guint n_param_values, const GValue *param_values, gpointer data) { GObject *object; GtkWidget *widget; GtkWidget *menu_shell; object = g_value_get_object (param_values + 0); g_return_val_if_fail (GTK_IS_WIDGET(object), FALSE); widget = GTK_WIDGET (object); if (!GTK_IS_MENU_ITEM (widget)) return TRUE; if (subsequent_focus_widget == widget) subsequent_focus_widget = NULL; menu_shell = gtk_widget_get_parent (widget); if (GTK_IS_MENU_SHELL (menu_shell)) { GtkWidget *parent_menu_shell; parent_menu_shell = GTK_MENU_SHELL (menu_shell)->parent_menu_shell; if (parent_menu_shell) { GtkWidget *active_menu_item; active_menu_item = GTK_MENU_SHELL (parent_menu_shell)->active_menu_item; if (active_menu_item) { gail_focus_notify_when_idle (active_menu_item); } } else { if (!GTK_IS_MENU_BAR (menu_shell)) { gail_focus_notify_when_idle (menu_shell); } } } was_deselect = TRUE; return TRUE; } static gboolean gail_switch_page_watcher (GSignalInvocationHint *ihint, guint n_param_values, const GValue *param_values, gpointer data) { GObject *object; GtkWidget *widget; GtkNotebook *notebook; object = g_value_get_object (param_values + 0); g_return_val_if_fail (GTK_IS_WIDGET(object), FALSE); widget = GTK_WIDGET (object); if (!GTK_IS_NOTEBOOK (widget)) return TRUE; notebook = GTK_NOTEBOOK (widget); if (!notebook->focus_tab) return TRUE; gail_focus_notify_when_idle (widget); return TRUE; } static gboolean gail_focus_idle_handler (gpointer data) { focus_notify_handler = 0; /* * The widget which was to receive focus may have been removed */ if (!next_focus_widget) { if (next_focus_widget != data) return FALSE; } else { void *vp_next_focus_widget = &next_focus_widget; g_object_remove_weak_pointer (G_OBJECT (next_focus_widget), vp_next_focus_widget); next_focus_widget = NULL; } gail_focus_notify (data); return FALSE; } static void gail_focus_notify (GtkWidget *widget) { AtkObject *atk_obj; gboolean transient; if (widget != focus_widget) { if (focus_widget) { void *vp_focus_widget = &focus_widget; g_object_remove_weak_pointer (G_OBJECT (focus_widget), vp_focus_widget); } focus_widget = widget; if (focus_widget) { void *vp_focus_widget = &focus_widget; g_object_add_weak_pointer (G_OBJECT (focus_widget), vp_focus_widget); /* * The UI may not have been updated yet; e.g. in gtkhtml2 * html_view_layout() is called in a idle handler */ if (focus_widget == focus_before_menu) { void *vp_focus_before_menu = &focus_before_menu; g_object_remove_weak_pointer (G_OBJECT (focus_before_menu), vp_focus_before_menu); focus_before_menu = NULL; } } gail_focus_notify_when_idle (focus_widget); } else { if (focus_widget) atk_obj = gail_get_accessible_for_widget (focus_widget, &transient); else atk_obj = NULL; /* * Do not report focus on redundant object */ if (atk_obj && (atk_object_get_role(atk_obj) != ATK_ROLE_REDUNDANT_OBJECT)) atk_focus_tracker_notify (atk_obj); if (atk_obj && transient) g_object_unref (atk_obj); if (subsequent_focus_widget) { GtkWidget *tmp_widget = subsequent_focus_widget; subsequent_focus_widget = NULL; gail_focus_notify_when_idle (tmp_widget); } } } static void gail_focus_notify_when_idle (GtkWidget *widget) { if (focus_notify_handler) { if (widget) { /* * Ignore focus request when menu item is going to be focused. * See bug #124232. */ if (GTK_IS_MENU_ITEM (next_focus_widget) && !GTK_IS_MENU_ITEM (widget)) return; if (next_focus_widget) { if (GTK_IS_MENU_ITEM (next_focus_widget) && GTK_IS_MENU_ITEM (widget)) { if (gtk_menu_item_get_submenu (GTK_MENU_ITEM (next_focus_widget)) == gtk_widget_get_parent (widget)) { if (subsequent_focus_widget) g_assert_not_reached (); subsequent_focus_widget = widget; return; } } } g_source_remove (focus_notify_handler); if (next_focus_widget) { void *vp_next_focus_widget = &next_focus_widget; g_object_remove_weak_pointer (G_OBJECT (next_focus_widget), vp_next_focus_widget); next_focus_widget = NULL; } } else /* * Ignore if focus is being set to NULL and we are waiting to set focus */ return; } if (widget) { void *vp_next_focus_widget = &next_focus_widget; next_focus_widget = widget; g_object_add_weak_pointer (G_OBJECT (next_focus_widget), vp_next_focus_widget); } else { /* * We are about to report focus as NULL so remove the weak pointer * for the widget we were waiting to report focus on. */ if (next_focus_widget) { void *vp_next_focus_widget = &next_focus_widget; g_object_remove_weak_pointer (G_OBJECT (next_focus_widget), vp_next_focus_widget); next_focus_widget = NULL; } } focus_notify_handler = gdk_threads_add_idle (gail_focus_idle_handler, widget); } static gboolean gail_deactivate_watcher (GSignalInvocationHint *ihint, guint n_param_values, const GValue *param_values, gpointer data) { GObject *object; GtkWidget *widget; GtkMenuShell *shell; GtkWidget *focus = NULL; object = g_value_get_object (param_values + 0); g_return_val_if_fail (GTK_IS_WIDGET(object), FALSE); widget = GTK_WIDGET (object); g_return_val_if_fail (GTK_IS_MENU_SHELL(widget), TRUE); shell = GTK_MENU_SHELL(widget); if (!shell->parent_menu_shell) focus = focus_before_menu; /* * If we are waiting to report focus on a menubar or a menu item * because of a previous deselect, cancel it. */ if (was_deselect && focus_notify_handler && next_focus_widget && (GTK_IS_MENU_BAR (next_focus_widget) || GTK_IS_MENU_ITEM (next_focus_widget))) { void *vp_next_focus_widget = &next_focus_widget; g_source_remove (focus_notify_handler); g_object_remove_weak_pointer (G_OBJECT (next_focus_widget), vp_next_focus_widget); next_focus_widget = NULL; focus_notify_handler = 0; was_deselect = FALSE; } gail_focus_notify_when_idle (focus); return TRUE; } static void gail_focus_tracker_init (void) { static gboolean emission_hooks_added = FALSE; if (!emission_hooks_added) { /* * We cannot be sure that the classes exist so we make sure that they do. */ g_type_class_ref (GTK_TYPE_WIDGET); g_type_class_ref (GTK_TYPE_ITEM); g_type_class_ref (GTK_TYPE_MENU_SHELL); g_type_class_ref (GTK_TYPE_NOTEBOOK); /* * We listen for event_after signal and then check that the * event was a focus in event so we get called after the event. */ g_signal_add_emission_hook ( g_signal_lookup ("event-after", GTK_TYPE_WIDGET), 0, gail_focus_watcher, NULL, (GDestroyNotify) NULL); /* * A "select" signal is emitted when arrow key is used to * move to a list item in the popup window of a GtkCombo or * a menu item in a menu. */ g_signal_add_emission_hook ( g_signal_lookup ("select", GTK_TYPE_ITEM), 0, gail_select_watcher, NULL, (GDestroyNotify) NULL); /* * A "deselect" signal is emitted when arrow key is used to * move from a menu item in a menu to the parent menu. */ g_signal_add_emission_hook ( g_signal_lookup ("deselect", GTK_TYPE_ITEM), 0, gail_deselect_watcher, NULL, (GDestroyNotify) NULL); /* * We listen for deactivate signals on menushells to determine * when the "focus" has left the menus. */ g_signal_add_emission_hook ( g_signal_lookup ("deactivate", GTK_TYPE_MENU_SHELL), 0, gail_deactivate_watcher, NULL, (GDestroyNotify) NULL); /* * We listen for "switch-page" signal on a GtkNotebook to notify * when page has changed because of clicking on a notebook tab. */ g_signal_add_emission_hook ( g_signal_lookup ("switch-page", GTK_TYPE_NOTEBOOK), 0, gail_switch_page_watcher, NULL, (GDestroyNotify) NULL); emission_hooks_added = TRUE; } } static void gail_focus_object_destroyed (gpointer data) { GObject *obj; obj = G_OBJECT (data); g_object_set_qdata (obj, quark_focus_object, NULL); g_object_unref (obj); } static void gail_focus_tracker (AtkObject *focus_object) { /* * Do not report focus on redundant object */ if (focus_object && (atk_object_get_role(focus_object) != ATK_ROLE_REDUNDANT_OBJECT)) { AtkObject *old_focus_object; if (!GTK_IS_ACCESSIBLE (focus_object)) { AtkObject *parent; parent = focus_object; while (1) { parent = atk_object_get_parent (parent); if (parent == NULL) break; if (GTK_IS_ACCESSIBLE (parent)) break; } if (parent) { gail_set_focus_object (focus_object, parent); } } else { old_focus_object = g_object_get_qdata (G_OBJECT (focus_object), quark_focus_object); if (old_focus_object) { g_object_weak_unref (G_OBJECT (old_focus_object), (GWeakNotify) gail_focus_object_destroyed, focus_object); g_object_set_qdata (G_OBJECT (focus_object), quark_focus_object, NULL); g_object_unref (G_OBJECT (focus_object)); } } } } static void gail_set_focus_widget (GtkWidget *focus_widget, GtkWidget *widget) { AtkObject *focus_obj; AtkObject *obj; focus_obj = gtk_widget_get_accessible (focus_widget); obj = gtk_widget_get_accessible (widget); gail_set_focus_object (focus_obj, obj); } static void gail_set_focus_object (AtkObject *focus_obj, AtkObject *obj) { AtkObject *old_focus_obj; old_focus_obj = g_object_get_qdata (G_OBJECT (obj), quark_focus_object); if (old_focus_obj != obj) { if (old_focus_obj) g_object_weak_unref (G_OBJECT (old_focus_obj), (GWeakNotify) gail_focus_object_destroyed, obj); else /* * We call g_object_ref as if obj is destroyed * while the weak reference exists then destroying the * focus_obj would cause gail_focus_object_destroyed to be * called when obj is not a valid GObject. */ g_object_ref (obj); g_object_weak_ref (G_OBJECT (focus_obj), (GWeakNotify) gail_focus_object_destroyed, obj); g_object_set_qdata (G_OBJECT (obj), quark_focus_object, focus_obj); } } /* * These exported symbols are hooked by gnome-program * to provide automatic module initialization and shutdown. */ extern void gnome_accessibility_module_init (void); extern void gnome_accessibility_module_shutdown (void); static int gail_initialized = FALSE; static void gail_accessibility_module_init (void) { const char *env_a_t_support; gboolean a_t_support = FALSE; if (gail_initialized) { return; } gail_initialized = TRUE; quark_focus_object = g_quark_from_static_string ("gail-focus-object"); env_a_t_support = g_getenv (GNOME_ACCESSIBILITY_ENV); if (env_a_t_support) a_t_support = atoi (env_a_t_support); if (a_t_support) fprintf (stderr, "GTK Accessibility Module initialized\n"); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_WIDGET, gail_widget); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_CONTAINER, gail_container); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_BUTTON, gail_button); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_ITEM, gail_item); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_MENU_ITEM, gail_menu_item); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_TOGGLE_BUTTON, gail_toggle_button); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_IMAGE, gail_image); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_TEXT_VIEW, gail_text_view); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_COMBO, gail_combo); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_COMBO_BOX, gail_combo_box); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_ENTRY, gail_entry); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_MENU_BAR, gail_menu_shell); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_MENU, gail_menu); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_WINDOW, gail_window); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_RANGE, gail_range); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_SCALE, gail_scale); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_SCALE_BUTTON, gail_scale_button); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_CLIST, gail_clist); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_LABEL, gail_label); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_STATUSBAR, gail_statusbar); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_NOTEBOOK, gail_notebook); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_CALENDAR, gail_calendar); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_PROGRESS_BAR, gail_progress_bar); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_SPIN_BUTTON, gail_spin_button); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_TREE_VIEW, gail_tree_view); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_FRAME, gail_frame); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_CELL_RENDERER_TEXT, gail_text_cell); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_CELL_RENDERER_TOGGLE, gail_boolean_cell); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_CELL_RENDERER_PIXBUF, gail_image_cell); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_CELL_RENDERER, gail_renderer_cell); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_RADIO_BUTTON, gail_radio_button); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_ARROW, gail_arrow); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_PIXMAP, gail_pixmap); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_SEPARATOR, gail_separator); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_BOX, gail_box); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_SCROLLED_WINDOW, gail_scrolled_window); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_LIST, gail_list); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_PANED, gail_paned); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_SCROLLBAR, gail_scrollbar); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_OPTION_MENU, gail_option_menu); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_CHECK_MENU_ITEM, gail_check_menu_item); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_RADIO_MENU_ITEM, gail_radio_menu_item); GAIL_WIDGET_SET_FACTORY (GTK_TYPE_EXPANDER, gail_expander); /* LIBGNOMECANVAS SUPPORT */ GAIL_WIDGET_SET_FACTORY (GTK_TYPE_OBJECT, gail_object); atk_focus_tracker_init (gail_focus_tracker_init); focus_tracker_id = atk_add_focus_tracker (gail_focus_tracker); /* Initialize the GailUtility class */ g_type_class_unref (g_type_class_ref (GAIL_TYPE_UTIL)); g_type_class_unref (g_type_class_ref (GAIL_TYPE_MISC)); } /** * gnome_accessibility_module_init: * @void: * * This method is invoked by name from libgnome's * gnome-program.c to activate accessibility support. **/ void gnome_accessibility_module_init (void) { gail_accessibility_module_init (); } /** * gnome_accessibility_module_shutdown: * @void: * * This method is invoked by name from libgnome's * gnome-program.c to de-activate accessibility support. **/ void gnome_accessibility_module_shutdown (void) { if (!gail_initialized) { return; } gail_initialized = FALSE; atk_remove_focus_tracker (focus_tracker_id); fprintf (stderr, "GTK Accessibility Module shutdown\n"); /* FIXME: de-register the factory types so we can unload ? */ } int gtk_module_init (gint *argc, char** argv[]) { const char* env_no_gail; gboolean no_gail = FALSE; env_no_gail = g_getenv (NO_GAIL_ENV); if (env_no_gail) no_gail = atoi (env_no_gail); if (no_gail) return 0; gail_accessibility_module_init (); return 0; } const char * g_module_check_init (GModule *module) { g_module_make_resident (module); return NULL; }