forked from AuroraMiddleware/gtk
805 lines
24 KiB
C
805 lines
24 KiB
C
/* GAIL - The GNOME Accessibility Implementation Library
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* Copyright 2001 Sun Microsystems Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <gtk/gtkx.h>
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#include "gailutil.h"
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#include "gailmisc.h"
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static gboolean gail_focus_watcher (GSignalInvocationHint *ihint,
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guint n_param_values,
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const GValue *param_values,
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gpointer data);
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static gboolean gail_select_watcher (GSignalInvocationHint *ihint,
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guint n_param_values,
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const GValue *param_values,
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gpointer data);
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static gboolean gail_deselect_watcher (GSignalInvocationHint *ihint,
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guint n_param_values,
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const GValue *param_values,
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gpointer data);
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static gboolean gail_switch_page_watcher(GSignalInvocationHint *ihint,
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guint n_param_values,
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const GValue *param_values,
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gpointer data);
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static void gail_finish_select (GtkWidget *widget);
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static void gail_map_cb (GtkWidget *widget);
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static void gail_map_submenu_cb (GtkWidget *widget);
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static gint gail_focus_idle_handler (gpointer data);
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static void gail_focus_notify (GtkWidget *widget);
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static void gail_focus_notify_when_idle (GtkWidget *widget);
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static void gail_focus_tracker_init (void);
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static void gail_focus_object_destroyed (gpointer data);
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static void gail_focus_tracker (AtkObject *object);
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static void gail_set_focus_widget (GtkWidget *focus_widget,
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GtkWidget *widget);
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static void gail_set_focus_object (AtkObject *focus_obj,
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AtkObject *obj);
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GtkWidget* _focus_widget = NULL;
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static GtkWidget* next_focus_widget = NULL;
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static gboolean was_deselect = FALSE;
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static GtkWidget* subsequent_focus_widget = NULL;
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static GtkWidget* focus_before_menu = NULL;
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static guint focus_notify_handler = 0;
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static guint focus_tracker_id = 0;
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static GQuark quark_focus_object = 0;
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static AtkObject*
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gail_get_accessible_for_widget (GtkWidget *widget,
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gboolean *transient)
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{
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AtkObject *obj = NULL;
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*transient = FALSE;
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if (!widget)
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return NULL;
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if (GTK_IS_ENTRY (widget))
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;
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else if (GTK_IS_NOTEBOOK (widget))
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{
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GtkNotebook *notebook;
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gint page_num = -1;
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notebook = GTK_NOTEBOOK (widget);
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page_num = gtk_notebook_get_current_page (notebook);
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if (page_num != -1)
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{
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obj = gtk_widget_get_accessible (widget);
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obj = atk_object_ref_accessible_child (obj, page_num);
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g_object_unref (obj);
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}
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}
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else if (GTK_IS_TOGGLE_BUTTON (widget))
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{
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GtkWidget *other_widget = gtk_widget_get_parent (widget);
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if (GTK_IS_COMBO_BOX (other_widget))
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{
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gail_set_focus_widget (other_widget, widget);
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widget = other_widget;
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}
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}
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if (obj == NULL)
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{
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AtkObject *focus_object;
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obj = gtk_widget_get_accessible (widget);
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focus_object = g_object_get_qdata (G_OBJECT (obj), quark_focus_object);
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/*
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* We check whether the object for this focus_object has been deleted.
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* This can happen when navigating to an empty directory in nautilus.
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* See bug #141907.
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*/
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if (ATK_IS_GOBJECT_ACCESSIBLE (focus_object))
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{
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if (!atk_gobject_accessible_get_object (ATK_GOBJECT_ACCESSIBLE (focus_object)))
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focus_object = NULL;
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}
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if (focus_object)
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obj = focus_object;
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}
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return obj;
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}
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static gboolean
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gail_focus_watcher (GSignalInvocationHint *ihint,
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guint n_param_values,
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const GValue *param_values,
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gpointer data)
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{
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GObject *object;
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GtkWidget *widget;
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GdkEvent *event;
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object = g_value_get_object (param_values + 0);
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g_return_val_if_fail (GTK_IS_WIDGET(object), FALSE);
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event = g_value_get_boxed (param_values + 1);
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widget = GTK_WIDGET (object);
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if (event->type == GDK_FOCUS_CHANGE)
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{
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if (event->focus_change.in)
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{
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if (GTK_IS_WINDOW (widget))
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{
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GtkWidget *focus_widget;
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GtkWindow *window;
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GtkWindowType type;
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window = GTK_WINDOW (widget);
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focus_widget = gtk_window_get_focus (window);
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g_object_get (window, "type", &type, NULL);
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if (focus_widget)
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{
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/*
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* If we already have a potential focus widget set this
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* windows's focus widget to focus_before_menu so that
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* it will be reported when menu item is unset.
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*/
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if (next_focus_widget)
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{
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if (GTK_IS_MENU_ITEM (next_focus_widget) &&
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!focus_before_menu)
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{
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void *vp_focus_before_menu = &focus_before_menu;
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focus_before_menu = focus_widget;
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g_object_add_weak_pointer (G_OBJECT (focus_before_menu), vp_focus_before_menu);
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}
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return TRUE;
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}
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widget = focus_widget;
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}
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else if (type == GTK_WINDOW_POPUP)
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{
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if (GTK_IS_BIN (widget))
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{
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GtkWidget *child = gtk_bin_get_child (GTK_BIN (widget));
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if (GTK_IS_WIDGET (child) && gtk_widget_has_grab (child))
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{
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if (GTK_IS_MENU_SHELL (child))
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{
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if (gtk_menu_shell_get_selected_item (GTK_MENU_SHELL (child)))
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{
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/*
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* We have a menu which has a menu item selected
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* so we do not report focus on the menu.
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*/
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return TRUE;
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}
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}
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widget = child;
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}
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}
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else /* popup window has no children; this edge case occurs in some custom code (OOo for instance) */
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{
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return TRUE;
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}
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}
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else /* Widget is a non-popup toplevel with no focus children;
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don't emit for this case either, as it's useless */
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{
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return TRUE;
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}
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}
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}
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else
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{
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if (next_focus_widget)
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{
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GtkWidget *toplevel;
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toplevel = gtk_widget_get_toplevel (next_focus_widget);
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if (toplevel == widget)
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next_focus_widget = NULL;
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}
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/* focus out */
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widget = NULL;
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}
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}
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else
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{
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if (event->type == GDK_MOTION_NOTIFY && gtk_widget_has_focus (widget))
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{
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if (widget == _focus_widget)
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{
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return TRUE;
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}
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}
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else
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{
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return TRUE;
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}
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}
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#ifdef GDK_WINDOWING_X11
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/*
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* If the focus widget is a GtkSocket without a plug
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* then ignore the focus notification as the embedded
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* plug will report a focus notification.
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*/
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if (GTK_IS_SOCKET (widget) &&
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gtk_socket_get_plug_window (GTK_SOCKET (widget)) != NULL)
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return TRUE;
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#endif
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/*
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* The widget may not yet be visible on the screen so we wait until it is.
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*/
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gail_focus_notify_when_idle (widget);
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return TRUE;
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}
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static gboolean
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gail_select_watcher (GSignalInvocationHint *ihint,
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guint n_param_values,
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const GValue *param_values,
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gpointer data)
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{
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GObject *object;
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GtkWidget *widget;
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object = g_value_get_object (param_values + 0);
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g_return_val_if_fail (GTK_IS_WIDGET(object), FALSE);
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widget = GTK_WIDGET (object);
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if (!gtk_widget_get_mapped (widget))
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{
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g_signal_connect (widget, "map",
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G_CALLBACK (gail_map_cb),
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NULL);
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}
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else
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gail_finish_select (widget);
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return TRUE;
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}
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static void
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gail_finish_select (GtkWidget *widget)
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{
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if (GTK_IS_MENU_ITEM (widget))
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{
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GtkMenuItem* menu_item;
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GtkWidget *submenu;
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menu_item = GTK_MENU_ITEM (widget);
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submenu = gtk_menu_item_get_submenu (menu_item);
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if (submenu &&
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!gtk_widget_get_mapped (submenu))
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{
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/*
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* If the submenu is not visble, wait until it is before
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* reporting focus on the menu item.
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*/
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gulong handler_id;
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handler_id = g_signal_handler_find (submenu,
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G_SIGNAL_MATCH_FUNC,
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g_signal_lookup ("map",
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GTK_TYPE_WINDOW),
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0,
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NULL,
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(gpointer) gail_map_submenu_cb,
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NULL);
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if (!handler_id)
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g_signal_connect (submenu, "map",
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G_CALLBACK (gail_map_submenu_cb),
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NULL);
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return;
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}
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/*
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* If we are waiting to report focus on a menubar or a menu item
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* because of a previous deselect, cancel it.
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*/
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if (was_deselect &&
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focus_notify_handler &&
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next_focus_widget &&
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(GTK_IS_MENU_BAR (next_focus_widget) ||
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GTK_IS_MENU_ITEM (next_focus_widget)))
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{
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void *vp_next_focus_widget = &next_focus_widget;
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g_source_remove (focus_notify_handler);
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g_object_remove_weak_pointer (G_OBJECT (next_focus_widget), vp_next_focus_widget);
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next_focus_widget = NULL;
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focus_notify_handler = 0;
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was_deselect = FALSE;
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}
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}
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/*
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* If previously focused widget is not a GtkMenuItem or a GtkMenu,
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* keep track of it so we can return to it after menubar is deactivated
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*/
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if (_focus_widget &&
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!GTK_IS_MENU_ITEM (_focus_widget) &&
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!GTK_IS_MENU (_focus_widget))
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{
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void *vp_focus_before_menu = &focus_before_menu;
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focus_before_menu = _focus_widget;
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g_object_add_weak_pointer (G_OBJECT (focus_before_menu), vp_focus_before_menu);
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}
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gail_focus_notify_when_idle (widget);
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return;
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}
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static void
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gail_map_cb (GtkWidget *widget)
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{
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gail_finish_select (widget);
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}
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static void
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gail_map_submenu_cb (GtkWidget *widget)
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{
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if (GTK_IS_MENU (widget))
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{
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GtkWidget *parent_menu_item;
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parent_menu_item = gtk_menu_get_attach_widget (GTK_MENU (widget));
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if (parent_menu_item)
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gail_finish_select (parent_menu_item);
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}
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}
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static gboolean
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gail_deselect_watcher (GSignalInvocationHint *ihint,
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guint n_param_values,
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const GValue *param_values,
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gpointer data)
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{
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GObject *object;
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GtkWidget *widget;
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GtkWidget *menu_shell;
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object = g_value_get_object (param_values + 0);
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g_return_val_if_fail (GTK_IS_WIDGET(object), FALSE);
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widget = GTK_WIDGET (object);
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if (!GTK_IS_MENU_ITEM (widget))
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return TRUE;
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if (subsequent_focus_widget == widget)
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subsequent_focus_widget = NULL;
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menu_shell = gtk_widget_get_parent (widget);
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if (GTK_IS_MENU_SHELL (menu_shell))
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{
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GtkWidget *parent_menu_shell;
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parent_menu_shell = gtk_menu_shell_get_parent_shell (GTK_MENU_SHELL (menu_shell));
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if (parent_menu_shell)
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{
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GtkWidget *active_menu_item;
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active_menu_item = gtk_menu_shell_get_selected_item (GTK_MENU_SHELL (parent_menu_shell));
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if (active_menu_item)
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{
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gail_focus_notify_when_idle (active_menu_item);
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}
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}
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else
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{
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if (!GTK_IS_MENU_BAR (menu_shell))
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{
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gail_focus_notify_when_idle (menu_shell);
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}
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}
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}
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was_deselect = TRUE;
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return TRUE;
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}
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static gboolean
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gail_switch_page_watcher (GSignalInvocationHint *ihint,
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guint n_param_values,
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const GValue *param_values,
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gpointer data)
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{
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GObject *object;
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GtkWidget *widget;
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object = g_value_get_object (param_values + 0);
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g_return_val_if_fail (GTK_IS_WIDGET(object), FALSE);
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widget = GTK_WIDGET (object);
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if (!GTK_IS_NOTEBOOK (widget))
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return TRUE;
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if (gtk_notebook_get_current_page (GTK_NOTEBOOK (widget)) == -1)
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return TRUE;
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gail_focus_notify_when_idle (widget);
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return TRUE;
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}
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static gboolean
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gail_focus_idle_handler (gpointer data)
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{
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focus_notify_handler = 0;
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/*
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* The widget which was to receive focus may have been removed
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*/
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if (!next_focus_widget)
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{
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if (next_focus_widget != data)
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return FALSE;
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}
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else
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{
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void *vp_next_focus_widget = &next_focus_widget;
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g_object_remove_weak_pointer (G_OBJECT (next_focus_widget), vp_next_focus_widget);
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next_focus_widget = NULL;
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}
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gail_focus_notify (data);
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return FALSE;
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}
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static void
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gail_focus_notify (GtkWidget *widget)
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{
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AtkObject *atk_obj;
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gboolean transient;
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if (widget != _focus_widget)
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{
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if (_focus_widget)
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{
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void *vp_focus_widget = &_focus_widget;
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g_object_remove_weak_pointer (G_OBJECT (_focus_widget), vp_focus_widget);
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}
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_focus_widget = widget;
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if (_focus_widget)
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{
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void *vp_focus_widget = &_focus_widget;
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g_object_add_weak_pointer (G_OBJECT (_focus_widget), vp_focus_widget);
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/*
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* The UI may not have been updated yet; e.g. in gtkhtml2
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* html_view_layout() is called in a idle handler
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*/
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if (_focus_widget == focus_before_menu)
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{
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void *vp_focus_before_menu = &focus_before_menu;
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g_object_remove_weak_pointer (G_OBJECT (focus_before_menu), vp_focus_before_menu);
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focus_before_menu = NULL;
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}
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}
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gail_focus_notify_when_idle (_focus_widget);
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}
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else
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{
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if (_focus_widget)
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atk_obj = gail_get_accessible_for_widget (_focus_widget, &transient);
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else
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atk_obj = NULL;
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/*
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* Do not report focus on redundant object
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*/
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if (atk_obj &&
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(atk_object_get_role(atk_obj) != ATK_ROLE_REDUNDANT_OBJECT))
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atk_focus_tracker_notify (atk_obj);
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if (atk_obj && transient)
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g_object_unref (atk_obj);
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if (subsequent_focus_widget)
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{
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GtkWidget *tmp_widget = subsequent_focus_widget;
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subsequent_focus_widget = NULL;
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gail_focus_notify_when_idle (tmp_widget);
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}
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}
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}
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static void
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gail_focus_notify_when_idle (GtkWidget *widget)
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{
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if (focus_notify_handler)
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{
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if (widget)
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{
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/*
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* Ignore focus request when menu item is going to be focused.
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* See bug #124232.
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*/
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if (GTK_IS_MENU_ITEM (next_focus_widget) && !GTK_IS_MENU_ITEM (widget))
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return;
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if (next_focus_widget)
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{
|
|
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 (! 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);
|
|
}
|
|
}
|
|
|
|
void
|
|
_gtk_accessibility_init (void)
|
|
{
|
|
static int initialized = FALSE;
|
|
|
|
if (initialized)
|
|
return;
|
|
|
|
initialized = TRUE;
|
|
quark_focus_object = g_quark_from_static_string ("gail-focus-object");
|
|
|
|
atk_focus_tracker_init (gail_focus_tracker_init);
|
|
focus_tracker_id = atk_add_focus_tracker (gail_focus_tracker);
|
|
|
|
_gail_util_install ();
|
|
|
|
atk_misc_instance = g_object_new (GAIL_TYPE_MISC, NULL);
|
|
}
|