atk/atkgobjectaccessible.c

   1 /* ATK - Accessibility Toolkit
   2  * Copyright 2001, 2002, 2003 Sun Microsystems Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include <atk/atkgobjectaccessible.h>
  21 #include <atk/atkregistry.h>
  22 #include <atk/atkutil.h>
  23
  24 static void       atk_gobject_accessible_class_init       (AtkGObjectAccessibleClass   *klass);
  25 static void       atk_real_gobject_accessible_initialize  (AtkObject         *atk_obj,
  26                                                            gpointer          data);
  27 static void       atk_gobject_accessible_dispose          (gpointer          data);
  28
  29 static GQuark quark_accessible_object = 0;
  30 static GQuark quark_object = 0;
  31 static gpointer parent_class = NULL;
  32
  33 GType
  34 atk_gobject_accessible_get_type (void)
  35 {
  36   static GType type = 0;
  37
  38   if (!type)
  39     {
  40       static const GTypeInfo tinfo =
  41       {
  42         sizeof (AtkGObjectAccessibleClass),
  43         (GBaseInitFunc) NULL, /* base init */
  44         (GBaseFinalizeFunc) NULL, /* base finalize */
  45         (GClassInitFunc) atk_gobject_accessible_class_init,
  46         (GClassFinalizeFunc) NULL, /* class finalize */
  47         NULL, /* class data */
  48         sizeof (AtkGObjectAccessible),
  49         0, /* nb preallocs */
  50         (GInstanceInitFunc) NULL, /* instance init */
  51         NULL /* value table */
  52       };
  53
  54       type = g_type_register_static (ATK_TYPE_OBJECT,
  55                                      "AtkGObjectAccessible", &tinfo, 0);
  56     }
  57
  58   return type;
  59 }
  60
  61 /**
  62  * atk_gobject_accessible_for_object:
  63  * @obj: a #GObject
  64  *
  65  * Gets the accessible object for the specified @obj.
  66  *
  67  * Returns: (transfer none): a #AtkObject which is the accessible object for
  68  * the @obj
  69  **/
  70 AtkObject*
  71 atk_gobject_accessible_for_object (GObject *obj)
  72 {
  73   AtkObject* accessible;
  74
  75   g_return_val_if_fail (G_IS_OBJECT (obj), NULL);
  76   /* See if we have a cached accessible for this object */
  77
  78   accessible = g_object_get_qdata (obj,
  79                                    quark_accessible_object);
  80
  81   if (!accessible)
  82     {
  83       AtkObjectFactory *factory;
  84       AtkRegistry *default_registry;
  85
  86       default_registry = atk_get_default_registry ();
  87       factory = atk_registry_get_factory (default_registry,
  88                                           G_OBJECT_TYPE (obj));
  89       accessible = atk_object_factory_create_accessible (factory,
  90                                                          obj);
  91       if (!ATK_IS_GOBJECT_ACCESSIBLE (accessible))
  92         {
  93           /*
  94            * The AtkObject which was created was not a AtkGObjectAccessible
  95            */
  96           g_object_weak_ref (obj,
  97                              (GWeakNotify) g_object_unref,
  98                              accessible);
  99           if (!quark_accessible_object)
 100             quark_accessible_object = g_quark_from_static_string ("accessible-object");
 101         }
 102       g_object_set_qdata (obj, quark_accessible_object, accessible);
 103     }
 104   return accessible;
 105 }
 106
 107 /**
 108  * atk_gobject_accessible_get_object:
 109  * @obj: a #AtkGObjectAccessible
 110  *
 111  * Gets the GObject for which @obj is the accessible object.
 112  *
 113  * Returns: (transfer none): a #GObject which is the object for which @obj is
 114  * the accessible object
 115  **/
 116 GObject *
 117 atk_gobject_accessible_get_object (AtkGObjectAccessible *obj)
 118 {
 119   g_return_val_if_fail (ATK_IS_GOBJECT_ACCESSIBLE (obj), NULL);
 120
 121   return g_object_get_qdata (G_OBJECT (obj), quark_object);
 122 }
 123
 124 static void
 125 atk_real_gobject_accessible_initialize (AtkObject  *atk_obj,
 126                                         gpointer   data)
 127 {
 128   AtkGObjectAccessible *atk_gobj;
 129
 130   atk_gobj = ATK_GOBJECT_ACCESSIBLE (atk_obj);
 131
 132   g_object_set_qdata (G_OBJECT (atk_gobj), quark_object, data);
 133   atk_obj->layer = ATK_LAYER_WIDGET;
 134
 135   g_object_weak_ref (data,
 136                      (GWeakNotify) atk_gobject_accessible_dispose,
 137                      atk_gobj);
 138 }
 139
 140 static void
 141 atk_gobject_accessible_dispose (gpointer  data)
 142 {
 143   GObject *object;
 144
 145   g_return_if_fail (ATK_IS_GOBJECT_ACCESSIBLE (data));
 146
 147   object = atk_gobject_accessible_get_object (data);
 148   if (object)
 149       g_object_set_qdata (object, quark_accessible_object, NULL);
 150
 151   g_object_set_qdata (G_OBJECT (data), quark_object, NULL);
 152   atk_object_notify_state_change (ATK_OBJECT (data), ATK_STATE_DEFUNCT,
 153                                   TRUE);
 154   g_object_unref (data);
 155 }
 156
 157 static void
 158 atk_gobject_accessible_class_init (AtkGObjectAccessibleClass *klass)
 159 {
 160   AtkObjectClass *class;
 161
 162   class = ATK_OBJECT_CLASS (klass);
 163
 164   parent_class = g_type_class_peek_parent (klass);
 165
 166   class->initialize = atk_real_gobject_accessible_initialize;
 167
 168   if (!quark_accessible_object)
 169     quark_accessible_object = g_quark_from_static_string ("accessible-object");
 170   quark_object = g_quark_from_static_string ("object-for-accessible");
 171 }