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gtk3/gtk/a11y/gtkaccessibility.c
Michael Weghorn 5147e95d1d a11y: Port from deprecated atk_focus_tracker_notify 
Port `gail_focus_notify` from using the deprecated
`atk_focus_tracker_notify` to notify about the new
focus object. Notify of a state of the focused state
instead, as suggested in the
`atk_focus_tracker_notify` doc [1].

Using the deprecated function e.g. resulted in
the Orca screen reader no longer announcing
initial focus on editable comboboxes in
LibreOffice Writer's toolbars after Orca dropped
support for the deprecated "focus" AT-SPI event
in this commit [2]:

    commit 9e2902dd46c7e583a097e235dfd7e3c50b016383
    Author: Joanmarie Diggs <jdiggs@igalia.com>
    Date:   Wed May 1 12:14:07 2024 +0200

        Remove the on_focus handler for the LibreOffice script

        The "focus:" event was deprecated many years ago. If the expected
        "object:state-changed:focused" event is absent, that bug should
        be fixed.

This commit makes the announcement work again.

It also fixes the scenario described in [3].

[1] https://docs.gtk.org/atk/func.focus_tracker_notify.html
[2] 9e2902dd46
[3] https://gitlab.gnome.org/GNOME/gtk/-/issues/454#note_2099344

Fixes: #454
2024-05-08 12:52:42 +02:00

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/* GTK+ - accessibility implementations
* 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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gtkaccessibility.h"
#include "gtkaccessibilityutil.h"
#include "gtkaccessibilitymisc.h"
#include "gtkwindowaccessible.h"
#include <stdio.h>
#include <stdlib.h>
#include <gdk/gdk.h>
#include <gtk/gtkcombobox.h>
#include <gtk/gtkentry.h>
#include <gtk/gtknotebook.h>
#include <gtk/gtkmenuitem.h>
#include <gtk/gtkmenu.h>
#include <gtk/gtkmenubar.h>
#include <gtk/gtksocket.h>
#include <gtk/gtktogglebutton.h>
#include <gtk/gtkaccessible.h>
#ifdef GDK_WINDOWING_X11
#include <atk-bridge.h>
#endif
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 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;
static int initialized = FALSE;
static AtkObject*
get_accessible_for_widget (GtkWidget *widget,
gboolean *transient)
{
AtkObject *obj = NULL;
*transient = FALSE;
if (!widget)
return NULL;
if (GTK_IS_ENTRY (widget))
;
else if (GTK_IS_NOTEBOOK (widget))
{
GtkNotebook *notebook;
gint page_num = -1;
notebook = GTK_NOTEBOOK (widget);
page_num = gtk_notebook_get_current_page (notebook);
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_IS_TOGGLE_BUTTON (widget))
{
GtkWidget *other_widget = gtk_widget_get_parent (widget);
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))
{
GtkWidget *focus_widget;
GtkWindow *window;
GtkWindowType type;
window = GTK_WINDOW (widget);
focus_widget = gtk_window_get_focus (window);
g_object_get (window, "type", &type, NULL);
if (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 = focus_widget;
g_object_add_weak_pointer (G_OBJECT (focus_before_menu), vp_focus_before_menu);
}
return TRUE;
}
widget = focus_widget;
}
else if (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_get_selected_item (GTK_MENU_SHELL (child)))
{
/*
* 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;
}
}
#ifdef GDK_WINDOWING_X11
/*
* 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_get_plug_window (GTK_SOCKET (widget)) != NULL)
return TRUE;
#endif
/*
* 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_get_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;
GtkWidget *submenu;
menu_item = GTK_MENU_ITEM (widget);
submenu = gtk_menu_item_get_submenu (menu_item);
if (submenu &&
!gtk_widget_get_mapped (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 (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 (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))
{
GtkWidget *parent_menu_item;
parent_menu_item = gtk_menu_get_attach_widget (GTK_MENU (widget));
if (parent_menu_item)
gail_finish_select (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_get_parent_shell (GTK_MENU_SHELL (menu_shell));
if (parent_menu_shell)
{
GtkWidget *active_menu_item;
active_menu_item = gtk_menu_shell_get_selected_item (GTK_MENU_SHELL (parent_menu_shell));
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;
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;
if (gtk_notebook_get_current_page (GTK_NOTEBOOK (widget)) == -1)
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 = 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_object_notify_state_change (atk_obj, ATK_STATE_FOCUSED, TRUE);
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);
g_source_set_name_by_id (focus_notify_handler, "[gtk+] gail_focus_idle_handler");
}
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 (! gtk_menu_shell_get_parent_shell (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_MENU_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_MENU_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_MENU_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);
}
}
static gboolean
state_event_watcher (GSignalInvocationHint *hint,
guint n_param_values,
const GValue *param_values,
gpointer data)
{
GObject *object;
GtkWidget *widget;
AtkObject *atk_obj;
AtkObject *parent;
GdkEventWindowState *event;
gchar *signal_name;
object = g_value_get_object (param_values + 0);
if (!GTK_IS_WINDOW (object))
return FALSE;
event = g_value_get_boxed (param_values + 1);
if (event->type == GDK_WINDOW_STATE)
return FALSE;
widget = GTK_WIDGET (object);
if (event->new_window_state & GDK_WINDOW_STATE_MAXIMIZED)
signal_name = "maximize";
else if (event->new_window_state & GDK_WINDOW_STATE_ICONIFIED)
signal_name = "minimize";
else if (event->new_window_state == 0)
signal_name = "restore";
else
return TRUE;
atk_obj = gtk_widget_get_accessible (widget);
if (GTK_IS_WINDOW_ACCESSIBLE (atk_obj))
{
parent = atk_object_get_parent (atk_obj);
if (parent == atk_get_root ())
g_signal_emit_by_name (atk_obj, signal_name);
return TRUE;
}
return FALSE;
}
static gboolean
configure_event_watcher (GSignalInvocationHint *hint,
guint n_param_values,
const GValue *param_values,
gpointer data)
{
GtkAllocation allocation;
GObject *object;
GtkWidget *widget;
AtkObject *atk_obj;
AtkObject *parent;
GdkEvent *event;
gchar *signal_name;
object = g_value_get_object (param_values + 0);
if (!GTK_IS_WINDOW (object))
return FALSE;
event = g_value_get_boxed (param_values + 1);
if (event->type != GDK_CONFIGURE)
return FALSE;
widget = GTK_WIDGET (object);
gtk_widget_get_allocation (widget, &allocation);
if (allocation.x == ((GdkEventConfigure *)event)->x &&
allocation.y == ((GdkEventConfigure *)event)->y &&
allocation.width == ((GdkEventConfigure *)event)->width &&
allocation.height == ((GdkEventConfigure *)event)->height)
return TRUE;
if (allocation.width != ((GdkEventConfigure *)event)->width ||
allocation.height != ((GdkEventConfigure *)event)->height)
signal_name = "resize";
else
signal_name = "move";
atk_obj = gtk_widget_get_accessible (widget);
if (GTK_IS_WINDOW_ACCESSIBLE (atk_obj))
{
parent = atk_object_get_parent (atk_obj);
if (parent == atk_get_root ())
g_signal_emit_by_name (atk_obj, signal_name);
return TRUE;
}
return FALSE;
}
static gboolean
window_focus (GtkWidget *widget,
GdkEventFocus *event)
{
AtkObject *atk_obj;
g_return_val_if_fail (GTK_IS_WIDGET (widget), FALSE);
atk_obj = gtk_widget_get_accessible (widget);
g_signal_emit_by_name (atk_obj, event->in ? "activate" : "deactivate");
return FALSE;
}
static void
window_added (AtkObject *atk_obj,
guint index,
AtkObject *child)
{
GtkWidget *widget;
if (!GTK_IS_WINDOW_ACCESSIBLE (child))
return;
widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (child));
if (!widget)
return;
g_signal_connect (widget, "focus-in-event", (GCallback) window_focus, NULL);
g_signal_connect (widget, "focus-out-event", (GCallback) window_focus, NULL);
g_signal_emit_by_name (child, "create");
}
static void
window_removed (AtkObject *atk_obj,
guint index,
AtkObject *child)
{
GtkWidget *widget;
GtkWindow *window;
if (!GTK_IS_WINDOW_ACCESSIBLE (child))
return;
widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (child));
if (!widget)
return;
window = GTK_WINDOW (widget);
/*
* Deactivate window if it is still focused and we are removing it. This
* can happen when a dialog displayed by gok is removed.
*/
if (gtk_window_is_active (window) && gtk_window_has_toplevel_focus (window))
g_signal_emit_by_name (child, "deactivate");
g_signal_handlers_disconnect_by_func (widget, (gpointer) window_focus, NULL);
g_signal_emit_by_name (child, "destroy");
}
static void
do_window_event_initialization (void)
{
AtkObject *root;
g_type_class_ref (GTK_TYPE_WINDOW_ACCESSIBLE);
g_signal_add_emission_hook (g_signal_lookup ("window-state-event", GTK_TYPE_WIDGET),
0, state_event_watcher, NULL, (GDestroyNotify) NULL);
g_signal_add_emission_hook (g_signal_lookup ("configure-event", GTK_TYPE_WIDGET),
0, configure_event_watcher, NULL, (GDestroyNotify) NULL);
root = atk_get_root ();
g_signal_connect (root, "children-changed::add", (GCallback) window_added, NULL);
g_signal_connect (root, "children-changed::remove", (GCallback) window_removed, NULL);
}
void
_gtk_accessibility_init (void)
{
if (initialized)
return;
initialized = TRUE;
quark_focus_object = g_quark_from_static_string ("gail-focus-object");
G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
atk_focus_tracker_init (gail_focus_tracker_init);
focus_tracker_id = atk_add_focus_tracker (gail_focus_tracker);
G_GNUC_END_IGNORE_DEPRECATIONS;
_gtk_accessibility_override_atk_util ();
do_window_event_initialization ();
#ifdef GDK_WINDOWING_X11
atk_bridge_adaptor_init (NULL, NULL);
#endif
atk_misc_instance = g_object_new (GTK_TYPE_MISC_IMPL, NULL);
}
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