libspi/relation.c

   1 /*
   2  * AT-SPI - Assistive Technology Service Provider Interface
   3  * (Gnome Accessibility Project; http://developer.gnome.org/projects/gap)
   4  *
   5  * Copyright 2001, 2002 Sun Microsystems Inc.,
   6  * Copyright 2001, 2002 Ximian, Inc.
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Library General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Library General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Library General Public
  19  * License along with this library; if not, write to the
  20  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  21  * Boston, MA 02111-1307, USA.
  22  */
  23
  24 /* relation.c : implements the Relation interface */
  25
  26 #include <config.h>
  27 #include <stdio.h>
  28 #include <libspi/accessible.h>
  29 #include <libspi/relation.h>
  30
  31
  32 static gboolean
  33 spi_init_relation_type_table (Accessibility_RelationType *types)
  34 {
  35   gint i;
  36
  37   for (i = 0; i < ATK_RELATION_LAST_DEFINED; i++)
  38     types[i] = ATK_RELATION_NULL;
  39
  40   types[ATK_RELATION_CONTROLLED_BY] = Accessibility_RELATION_CONTROLLED_BY;
  41   types[ATK_RELATION_CONTROLLER_FOR] = Accessibility_RELATION_CONTROLLER_FOR;
  42   types[ATK_RELATION_LABEL_FOR] = Accessibility_RELATION_LABEL_FOR;
  43   types[ATK_RELATION_LABELLED_BY] = Accessibility_RELATION_LABELLED_BY;
  44   types[ATK_RELATION_MEMBER_OF] = Accessibility_RELATION_MEMBER_OF;
  45   types[ATK_RELATION_NODE_CHILD_OF] = Accessibility_RELATION_NODE_CHILD_OF;
  46   types[ATK_RELATION_FLOWS_TO] = Accessibility_RELATION_FLOWS_TO;
  47   types[ATK_RELATION_FLOWS_FROM] = Accessibility_RELATION_FLOWS_FROM;
  48   types[ATK_RELATION_SUBWINDOW_OF] = Accessibility_RELATION_SUBWINDOW_OF;
  49   types[ATK_RELATION_EMBEDS] = Accessibility_RELATION_EMBEDS;
  50   types[ATK_RELATION_EMBEDDED_BY] = Accessibility_RELATION_EMBEDDED_BY;
  51   return TRUE;
  52 }
  53
  54
  55
  56 static Accessibility_RelationType
  57 spi_relation_type_from_atk_relation_type (AtkRelationType type)
  58 {
  59   static gboolean is_initialized = FALSE;
  60   static Accessibility_RelationType spi_relation_type_table [ATK_RELATION_LAST_DEFINED];
  61   Accessibility_RelationType spi_type;
  62
  63   if (!is_initialized)
  64     is_initialized = spi_init_relation_type_table (spi_relation_type_table);
  65
  66   if (type > ATK_RELATION_NULL && type < ATK_RELATION_LAST_DEFINED)
  67     spi_type = spi_relation_type_table[type];
  68   else
  69     spi_type = Accessibility_RELATION_EXTENDED;
  70   return spi_type;
  71 }
  72
  73
  74
  75 static AtkRelation *
  76 get_relation_from_servant (PortableServer_Servant servant)
  77 {
  78   SpiBase *base = SPI_BASE (bonobo_object_from_servant(servant));
  79
  80   g_return_val_if_fail (base, NULL);
  81   return  ATK_RELATION(base->gobj);
  82 }
  83
  84
  85
  86 static Accessibility_RelationType
  87 impl_getRelationType (PortableServer_Servant servant,
  88                       CORBA_Environment * ev)
  89 {
  90   AtkRelation *relation = get_relation_from_servant (servant);
  91   AtkRelationType type;
  92
  93   g_return_val_if_fail (relation != NULL, 0);
  94   type = atk_relation_get_relation_type (relation);
  95   return spi_relation_type_from_atk_relation_type (type);
  96 }
  97
  98
  99 static CORBA_short
 100 impl_getNTargets (PortableServer_Servant servant,
 101                   CORBA_Environment * ev)
 102 {
 103   AtkRelation *relation = get_relation_from_servant(servant);
 104   g_return_val_if_fail (relation != NULL, 0);
 105
 106   return relation->target ? relation->target->len : 0;
 107 }
 108
 109
 110 static CORBA_Object
 111 impl_getTarget (PortableServer_Servant servant,
 112                 const CORBA_short index,
 113                 CORBA_Environment * ev)
 114 {
 115   AtkObject *atk_object;
 116   AtkRelation *relation = get_relation_from_servant (servant);
 117   g_return_val_if_fail (relation, NULL);
 118
 119   if (!relation->target ||
 120       index < 0 ||
 121       index >= relation->target->len)
 122     return CORBA_OBJECT_NIL;
 123
 124   atk_object = g_ptr_array_index (relation->target, index);
 125   if (!atk_object)
 126     return CORBA_OBJECT_NIL;
 127
 128   return spi_accessible_new_return (atk_object, FALSE, ev);
 129 }
 130
 131
 132 SpiRelation *
 133 spi_relation_new (AtkRelation *obj)
 134 {
 135   SpiRelation *new_relation = g_object_new (SPI_RELATION_TYPE, NULL);
 136   spi_base_construct (SPI_BASE (new_relation), G_OBJECT (obj));
 137   return new_relation;
 138 }
 139
 140
 141 static void
 142 spi_relation_class_init (SpiRelationClass *klass)
 143 {
 144   POA_Accessibility_Relation__epv *epv = &klass->epv;
 145
 146   epv->getRelationType  = impl_getRelationType;
 147   epv->getNTargets      = impl_getNTargets;
 148   epv->getTarget        = impl_getTarget;
 149 }
 150
 151
 152 static void
 153 spi_relation_init (SpiRelation *relation)
 154 {
 155 }
 156
 157
 158 BONOBO_TYPE_FUNC_FULL (SpiRelation,
 159                        Accessibility_Relation,
 160                        SPI_TYPE_BASE,
 161                        spi_relation);