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/* ATK - Accessibility Toolkit
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* Copyright 2001, 2002, 2003 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 <atk/atkgobjectaccessible.h>
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#include <atk/atkregistry.h>
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#include <atk/atkutil.h>
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/**
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* SECTION:atkgobjectaccessible
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* @Short_description: This object class is derived from AtkObject and
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* can be used as a basis implementing accessible objects.
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* @Title:AtkGObjectAccessible
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*
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* This object class is derived from AtkObject. It can be used as a
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* basis for implementing accessible objects for GObjects which are
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* not derived from GtkWidget. One example of its use is in providing
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* an accessible object for GnomeCanvasItem in the GAIL library.
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*/
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static void atk_gobject_accessible_class_init (AtkGObjectAccessibleClass *klass);
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static void atk_real_gobject_accessible_initialize (AtkObject *atk_obj,
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gpointer data);
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static void atk_gobject_accessible_object_gone_cb (gpointer data);
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static GQuark quark_accessible_object = 0;
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static GQuark quark_object = 0;
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static gpointer parent_class = NULL;
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GType
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atk_gobject_accessible_get_type (void)
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{
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static GType type = 0;
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if (!type)
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{
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static const GTypeInfo tinfo =
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{
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sizeof (AtkGObjectAccessibleClass),
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(GBaseInitFunc) NULL, /* base init */
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(GBaseFinalizeFunc) NULL, /* base finalize */
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(GClassInitFunc) atk_gobject_accessible_class_init,
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(GClassFinalizeFunc) NULL, /* class finalize */
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NULL, /* class data */
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sizeof (AtkGObjectAccessible),
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0, /* nb preallocs */
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(GInstanceInitFunc) NULL, /* instance init */
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NULL /* value table */
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};
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type = g_type_register_static (ATK_TYPE_OBJECT,
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"AtkGObjectAccessible", &tinfo, 0);
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}
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return type;
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}
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/**
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* atk_gobject_accessible_for_object:
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* @obj: a #GObject
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*
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* Gets the accessible object for the specified @obj.
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*
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* Returns: (transfer none): a #AtkObject which is the accessible object for
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* the @obj
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**/
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AtkObject*
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atk_gobject_accessible_for_object (GObject *obj)
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{
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AtkObject* accessible;
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g_return_val_if_fail (G_IS_OBJECT (obj), NULL);
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/* See if we have a cached accessible for this object */
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accessible = quark_accessible_object ? g_object_get_qdata (obj, quark_accessible_object) : NULL;
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if (!accessible)
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{
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AtkObjectFactory *factory;
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AtkRegistry *default_registry;
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default_registry = atk_get_default_registry ();
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factory = atk_registry_get_factory (default_registry,
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G_OBJECT_TYPE (obj));
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accessible = atk_object_factory_create_accessible (factory,
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obj);
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if (!ATK_IS_GOBJECT_ACCESSIBLE (accessible))
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{
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/*
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* The AtkObject which was created was not a AtkGObjectAccessible
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*/
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g_object_weak_ref (obj,
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(GWeakNotify) g_object_unref,
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accessible);
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if (!quark_accessible_object)
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quark_accessible_object = g_quark_from_static_string ("accessible-object");
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}
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g_object_set_qdata (obj, quark_accessible_object, accessible);
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}
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return accessible;
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}
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/**
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* atk_gobject_accessible_get_object:
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* @obj: a #AtkGObjectAccessible
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*
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* Gets the GObject for which @obj is the accessible object.
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*
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* Returns: (transfer none): a #GObject which is the object for which @obj is
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* the accessible object
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**/
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GObject *
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atk_gobject_accessible_get_object (AtkGObjectAccessible *obj)
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{
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g_return_val_if_fail (ATK_IS_GOBJECT_ACCESSIBLE (obj), NULL);
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return g_object_get_qdata (G_OBJECT (obj), quark_object);
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}
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static void
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atk_real_gobject_accessible_initialize (AtkObject *atk_obj,
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gpointer data)
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{
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AtkGObjectAccessible *atk_gobj;
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atk_gobj = ATK_GOBJECT_ACCESSIBLE (atk_obj);
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g_object_set_qdata (G_OBJECT (atk_gobj), quark_object, data);
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atk_obj->layer = ATK_LAYER_WIDGET;
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g_object_weak_ref (data,
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(GWeakNotify) atk_gobject_accessible_object_gone_cb,
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atk_gobj);
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}
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static void
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atk_gobject_accessible_object_gone_cb (gpointer data)
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{
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GObject *object;
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g_return_if_fail (ATK_IS_GOBJECT_ACCESSIBLE (data));
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object = atk_gobject_accessible_get_object (data);
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if (object)
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g_object_set_qdata (object, quark_accessible_object, NULL);
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g_object_set_qdata (G_OBJECT (data), quark_object, NULL);
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atk_object_notify_state_change (ATK_OBJECT (data), ATK_STATE_DEFUNCT,
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TRUE);
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g_object_unref (data);
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}
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static void
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atk_gobject_accessible_dispose (GObject *atk_obj)
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{
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GObject *obj = atk_gobject_accessible_get_object (ATK_GOBJECT_ACCESSIBLE (atk_obj));
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if (obj) {
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g_object_set_qdata (obj, quark_accessible_object, NULL);
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g_object_weak_unref (obj,
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(GWeakNotify) atk_gobject_accessible_object_gone_cb,
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atk_obj);
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g_object_set_qdata (atk_obj, quark_object, NULL);
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atk_object_notify_state_change (ATK_OBJECT (atk_obj), ATK_STATE_DEFUNCT,
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TRUE);
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}
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G_OBJECT_CLASS (parent_class)->dispose (atk_obj);
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}
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static void
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atk_gobject_accessible_class_init (AtkGObjectAccessibleClass *klass)
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{
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AtkObjectClass *class;
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GObjectClass *object_class;
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class = ATK_OBJECT_CLASS (klass);
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parent_class = g_type_class_peek_parent (klass);
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class->initialize = atk_real_gobject_accessible_initialize;
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object_class = G_OBJECT_CLASS (klass);
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object_class->dispose = atk_gobject_accessible_dispose;
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if (!quark_accessible_object)
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quark_accessible_object = g_quark_from_static_string ("accessible-object");
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quark_object = g_quark_from_static_string ("object-for-accessible");
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}
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