atk/atkobjectfactory.c

   1 /* ATK - Accessibility Toolkit
   2  * Copyright 2001 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 "atkobjectfactory.h"
  21 #include "atknoopobjectfactory.h"
  22
  23 static void atk_object_factory_class_init   (AtkObjectFactoryClass        *klass);
  24
  25 static gpointer    parent_class = NULL;
  26
  27 GType
  28 atk_object_factory_get_type (void)
  29 {
  30   static GType type = 0;
  31
  32   if (!type) {
  33     GTypeInfo tinfo =
  34     {
  35       sizeof (AtkObjectFactoryClass),
  36       (GBaseInitFunc) NULL, /* base init */
  37       (GBaseFinalizeFunc) NULL, /* base finalize */
  38       (GClassInitFunc) atk_object_factory_class_init, /* class init */
  39       (GClassFinalizeFunc) NULL, /* class finalize */
  40       NULL, /* class data */
  41       sizeof (AtkObjectFactory), /* instance size */
  42       0, /* nb preallocs */
  43       (GInstanceInitFunc) NULL, /* instance init */
  44       NULL /* value table */
  45     };
  46
  47     type = g_type_register_static (G_TYPE_OBJECT, "AtkObjectFactory", &tinfo, 0);
  48   }
  49   return type;
  50 }
  51
  52 static void
  53 atk_object_factory_class_init (AtkObjectFactoryClass *klass)
  54 {
  55   parent_class = g_type_class_peek_parent (klass);
  56
  57 }
  58
  59 /**
  60  * atk_object_factory_create_accessible:
  61  * @factory: The #AtkObjectFactory associated with @obj's
  62  * object type
  63  * @obj: a #GObject
  64  *
  65  * Provides an #AtkObject that implements an accessibility interface
  66  * on behalf of @obj
  67  *
  68  * Returns: an #AtkObject that implements an accessibility interface
  69  * on behalf of @obj
  70  **/
  71 AtkObject*
  72 atk_object_factory_create_accessible (AtkObjectFactory *factory,
  73                                       GObject          *obj)
  74 {
  75   AtkObjectFactoryClass *klass;
  76   AtkObject *accessible = NULL;
  77
  78   g_return_val_if_fail (ATK_IS_OBJECT_FACTORY (factory), NULL);
  79   g_return_val_if_fail (G_IS_OBJECT (obj), NULL);
  80
  81   klass = ATK_OBJECT_FACTORY_GET_CLASS (factory);
  82
  83   if (klass->create_accessible)
  84   {
  85       accessible = klass->create_accessible (obj);
  86   }
  87   return accessible;
  88 }
  89
  90 /**
  91  * atk_object_factory_invalidate:
  92  * @factory: an #AtkObjectFactory to invalidate
  93  *
  94  * Inform @factory that it is no longer being used to create
  95  * accessibles. When called, @factory may need to inform
  96  * #AtkObjects which it has created that they need to be re-instantiated.
  97  * Note: primarily used for runtime replacement of #AtkObjectFactorys
  98  * in object registries.
  99  **/
 100 void
 101 atk_object_factory_invalidate (AtkObjectFactory *factory)
 102 {
 103   AtkObjectFactoryClass *klass;
 104
 105   g_return_if_fail (ATK_OBJECT_FACTORY (factory));
 106
 107   klass = ATK_OBJECT_FACTORY_GET_CLASS (factory);
 108   if (klass->invalidate)
 109      (klass->invalidate) (factory);
 110 }
 111
 112 /**
 113  * atk_object_factory_get_accessible_type:
 114  * @factory: an #AtkObjectFactory
 115  *
 116  * Gets the GType of the accessible which is created by the factory.
 117  * The value G_TYPE_INVALID is returned if no type if found.
 118  * Returns: the type of the accessible which is created by the @factory.
 119  **/
 120 GType
 121 atk_object_factory_get_accessible_type (AtkObjectFactory *factory)
 122 {
 123   AtkObjectFactoryClass *klass;
 124
 125   g_return_val_if_fail (ATK_OBJECT_FACTORY (factory), G_TYPE_INVALID);
 126
 127   klass = ATK_OBJECT_FACTORY_GET_CLASS (factory);
 128   if (klass->get_accessible_type)
 129      return (klass->get_accessible_type) ();
 130   else
 131      return G_TYPE_INVALID;
 132 }