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/* GAIL - The GNOME Accessibility Implementation Library
* Copyright 2001, 2002, 2003 Sun Microsystems Inc.
*
* This program 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.
*
* This program 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 General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <gtk/gtk.h>
#include <libgnomecanvas/gnome-canvas.h>
#include <libgnomecanvas/gnome-canvas-text.h>
#include <libgnomecanvas/gnome-canvas-widget.h>
#include "gailcanvas.h"
#include "gailcanvasitem.h"
#include "gailcanvasgroupfactory.h"
#include "gailcanvastextfactory.h"
#include "gailcanvasitemfactory.h"
#include "gailcanvaswidgetfactory.h"
static void gail_canvas_real_initialize (AtkObject *obj,
gpointer data);
static gint gail_canvas_get_n_children (AtkObject *obj);
static AtkObject * gail_canvas_ref_child (AtkObject *obj,
gint i);
static void adjustment_changed (GtkAdjustment *adjustment,
GnomeCanvas *canvas);
G_DEFINE_TYPE (GailCanvas, gail_canvas, GTK_TYPE_CONTAINER_ACCESSIBLE)
static void
gail_canvas_init (GailCanvas *canvas)
{
}
/**
* Tell ATK how to create the appropriate AtkObject peers
**/
void
gail_canvas_a11y_init (void)
{
atk_registry_set_factory_type (atk_get_default_registry (),
GNOME_TYPE_CANVAS_GROUP,
gail_canvas_group_factory_get_type ());
atk_registry_set_factory_type (atk_get_default_registry (),
GNOME_TYPE_CANVAS_TEXT,
gail_canvas_text_factory_get_type ());
atk_registry_set_factory_type (atk_get_default_registry (),
GNOME_TYPE_CANVAS_WIDGET,
gail_canvas_widget_factory_get_type ());
atk_registry_set_factory_type (atk_get_default_registry (),
GNOME_TYPE_CANVAS_ITEM,
gail_canvas_item_factory_get_type ());
}
static void
gail_canvas_class_init (GailCanvasClass *klass)
{
AtkObjectClass *class = ATK_OBJECT_CLASS (klass);
class->get_n_children = gail_canvas_get_n_children;
class->ref_child = gail_canvas_ref_child;
class->initialize = gail_canvas_real_initialize;
}
AtkObject *
gail_canvas_new (GtkWidget *widget)
{
GObject *object;
AtkObject *accessible;
g_return_val_if_fail (GNOME_IS_CANVAS (widget), NULL);
object = g_object_new (GAIL_TYPE_CANVAS, NULL);
accessible = ATK_OBJECT (object);
atk_object_initialize (accessible, widget);
return accessible;
}
static void
gail_canvas_real_initialize (AtkObject *obj,
gpointer data)
{
GnomeCanvas *canvas;
GtkAdjustment *adj;
ATK_OBJECT_CLASS (gail_canvas_parent_class)->initialize (obj, data);
canvas = GNOME_CANVAS (data);
adj = gtk_scrollable_get_hadjustment (GTK_SCROLLABLE (canvas));
g_signal_connect (
adj, "value_changed",
G_CALLBACK (adjustment_changed), canvas);
adj = gtk_scrollable_get_vadjustment (GTK_SCROLLABLE (canvas));
g_signal_connect (
adj, "value_changed",
G_CALLBACK (adjustment_changed), canvas);
obj->role = ATK_ROLE_LAYERED_PANE;
}
static gint
gail_canvas_get_n_children (AtkObject *obj)
{
GtkAccessible *accessible;
GtkWidget *widget;
GnomeCanvas *canvas;
GnomeCanvasGroup *root_group;
g_return_val_if_fail (GAIL_IS_CANVAS (obj), 0);
accessible = GTK_ACCESSIBLE (obj);
widget = gtk_accessible_get_widget (accessible);
if (widget == NULL)
/* State is defunct */
return 0;
g_return_val_if_fail (GNOME_IS_CANVAS (widget), 0);
canvas = GNOME_CANVAS (widget);
root_group = gnome_canvas_root (canvas);
g_return_val_if_fail (root_group, 0);
return 1;
}
static AtkObject *
gail_canvas_ref_child (AtkObject *obj,
gint i)
{
GtkAccessible *accessible;
GtkWidget *widget;
GnomeCanvas *canvas;
GnomeCanvasGroup *root_group;
AtkObject *atk_object;
/* Canvas only has one child, so return NULL if anything else is requested */
if (i != 0)
return NULL;
g_return_val_if_fail (GAIL_IS_CANVAS (obj), NULL);
accessible = GTK_ACCESSIBLE (obj);
widget = gtk_accessible_get_widget (accessible);
if (widget == NULL)
/* State is defunct */
return NULL;
g_return_val_if_fail (GNOME_IS_CANVAS (widget), NULL);
canvas = GNOME_CANVAS (widget);
root_group = gnome_canvas_root (canvas);
g_return_val_if_fail (root_group, NULL);
atk_object = atk_gobject_accessible_for_object (G_OBJECT (root_group));
g_object_ref (atk_object);
return atk_object;
}
static void
adjustment_changed (GtkAdjustment *adjustment,
GnomeCanvas *canvas)
{
AtkObject *atk_obj;
/*
* The scrollbars have changed
*/
atk_obj = gtk_widget_get_accessible (GTK_WIDGET (canvas));
g_signal_emit_by_name (atk_obj, "visible_data_changed");
}
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