atk/atkrelation.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 <string.h>
  21 #include <glib-object.h>
  22 #include "atkobject.h"
  23 #include "atkrelation.h"
  24 #include "atk-enum-types.h"
  25
  26 GPtrArray *extra_names = NULL;
  27
  28 static gpointer parent_class = NULL;
  29
  30 static void atk_relation_class_init (AtkRelationClass *klass);
  31 static void atk_relation_finalize   (GObject          *object);
  32
  33 GType
  34 atk_relation_get_type (void)
  35 {
  36   static GType type = 0;
  37
  38   if (!type)
  39     {
  40       static const GTypeInfo typeInfo =
  41       {
  42         sizeof (AtkRelationClass),
  43         (GBaseInitFunc) NULL,
  44         (GBaseFinalizeFunc) NULL,
  45         (GClassInitFunc) atk_relation_class_init,
  46         (GClassFinalizeFunc) NULL,
  47         NULL,
  48         sizeof (AtkRelation),
  49         0,
  50         (GInstanceInitFunc) NULL,
  51       } ;
  52       type = g_type_register_static (G_TYPE_OBJECT, "AtkRelation", &typeInfo, 0) ;
  53     }
  54   return type;
  55 }
  56
  57 static void
  58 atk_relation_class_init (AtkRelationClass *klass)
  59 {
  60   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
  61
  62   parent_class = g_type_class_peek_parent (klass);
  63
  64   gobject_class->finalize = atk_relation_finalize;
  65 }
  66
  67 /**
  68  * atk_relation_type_register:
  69  * @name: a name string
  70  *
  71  * Associate @name with a new #AtkRelationType
  72  *
  73  * Returns: an #AtkRelationType associated with @name
  74  **/
  75 AtkRelationType
  76 atk_relation_type_register (const gchar *name)
  77 {
  78   g_return_val_if_fail (name, ATK_RELATION_NULL);
  79
  80   if (!extra_names)
  81     extra_names = g_ptr_array_new ();
  82
  83   g_ptr_array_add (extra_names, g_strdup (name));
  84   return extra_names->len + ATK_RELATION_LAST_DEFINED;
  85 }
  86
  87 /**
  88  * atk_relation_type_get_name:
  89  * @type: The #AtkRelationType whose name is required
  90  *
  91  * Gets the description string describing the #AtkRelationType @type.
  92  *
  93  * Returns: the string describing the AtkRelationType
  94  */
  95 G_CONST_RETURN gchar*
  96 atk_relation_type_get_name (AtkRelationType type)
  97 {
  98   GTypeClass *type_class;
  99   GEnumValue *value;
 100   gchar *name = NULL;
 101
 102   type_class = g_type_class_ref (ATK_TYPE_RELATION_TYPE);
 103   g_return_val_if_fail (G_IS_ENUM_CLASS (type_class), NULL);
 104
 105   value = g_enum_get_value (G_ENUM_CLASS (type_class), type);
 106
 107   if (value)
 108     {
 109       name = value->value_nick;
 110     }
 111   else
 112     {
 113       if (extra_names)
 114         {
 115           gint n = type;
 116
 117           n -= ATK_RELATION_LAST_DEFINED + 1;
 118
 119           if (n < extra_names->len)
 120             name = g_ptr_array_index (extra_names, n);
 121         }
 122     }
 123   g_type_class_unref (type_class);
 124   return name;
 125 }
 126
 127 /**
 128  * atk_relation_type_for_name:
 129  * @name: a string which is the (non-localized) name of an ATK relation type.
 130  *
 131  * Get the #AtkRelationType type corresponding to a relation name.
 132  *
 133  * Returns: the #AtkRelationType enumerated type corresponding to the specified name,
 134  *          or #ATK_RELATION_NULL if no matching relation type is found.
 135  **/
 136 AtkRelationType
 137 atk_relation_type_for_name (const gchar *name)
 138 {
 139   GTypeClass *type_class;
 140   GEnumValue *value;
 141   AtkRelationType type = ATK_RELATION_NULL;
 142
 143   g_return_val_if_fail (name, ATK_RELATION_NULL);
 144
 145   type_class = g_type_class_ref (ATK_TYPE_RELATION_TYPE);
 146   g_return_val_if_fail (G_IS_ENUM_CLASS (type_class), ATK_RELATION_NULL);
 147
 148   value = g_enum_get_value_by_nick (G_ENUM_CLASS (type_class), name);
 149
 150   if (value)
 151     {
 152       type = value->value;
 153     }
 154   else
 155     {
 156       gint i;
 157
 158       if (extra_names)
 159         {
 160           for (i = 0; i < extra_names->len; i++)
 161             {
 162               gchar *extra_name = (gchar *)g_ptr_array_index (extra_names, i);
 163
 164               g_return_val_if_fail (extra_name, ATK_RELATION_NULL);
 165
 166               if (strcmp (name, extra_name) == 0)
 167                 {
 168                   type = i + 1 + ATK_RELATION_LAST_DEFINED;
 169                   break;
 170                 }
 171             }
 172         }
 173     }
 174   g_type_class_unref (type_class);
 175
 176   return type;
 177 }
 178
 179
 180 /**
 181  * atk_relation_new:
 182  * @targets: an array of pointers to #AtkObjects
 183  * @n_targets: number of #AtkObjects pointed to by @targets
 184  * @relationship: an #AtkRelationType with which to create the new
 185  *  #AtkRelation
 186  *
 187  * Create a new relation for the specified key and the specified list
 188  * of targets.
 189  *
 190  * Returns: a pointer to a new #AtkRelation
 191  **/
 192 AtkRelation*
 193 atk_relation_new (AtkObject       **targets,
 194                   gint            n_targets,
 195                   AtkRelationType relationship)
 196 {
 197   AtkRelation *relation;
 198   int         i;
 199   GPtrArray      *array;
 200
 201   g_return_val_if_fail (targets != NULL, NULL);
 202
 203   relation = g_object_new (ATK_TYPE_RELATION, NULL);
 204   array = g_ptr_array_sized_new (n_targets);
 205   for (i = 0; i < n_targets; i++)
 206   {
 207     /*
 208      * Add a reference to AtkObject being added to a relation
 209      */
 210     g_object_ref (targets[i]);
 211     g_ptr_array_add (array, targets[i]);
 212   }
 213
 214   relation->target = array;
 215   relation->relationship = relationship;
 216
 217   return relation;
 218 }
 219
 220 /**
 221  * atk_relation_get_relation_type:
 222  * @relation: an #AtkRelation
 223  *
 224  * Gets the type of @relation
 225  *
 226  * Returns: the type of @relation
 227  **/
 228 AtkRelationType
 229 atk_relation_get_relation_type (AtkRelation *relation)
 230 {
 231   g_return_val_if_fail (ATK_IS_RELATION (relation), 0);
 232
 233   return relation->relationship;
 234 }
 235
 236 /**
 237  * atk_relation_get_target:
 238  * @relation: an #AtkRelation
 239  *
 240  * Gets the target list of @relation
 241  *
 242  * Returns: the target list of @relation
 243  **/
 244 GPtrArray*
 245 atk_relation_get_target (AtkRelation *relation)
 246 {
 247   g_return_val_if_fail (ATK_IS_RELATION (relation), FALSE);
 248
 249   return relation->target;
 250 }
 251
 252 static void
 253 atk_relation_finalize (GObject *object)
 254 {
 255   AtkRelation        *relation;
 256
 257   g_return_if_fail (ATK_IS_RELATION (object));
 258
 259   relation = ATK_RELATION (object);
 260
 261   if (relation->target)
 262   {
 263     gint i;
 264
 265     for (i = 0; i < relation->target->len; i++)
 266     {
 267       /*
 268        * Remove a reference to AtkObject being removed from a relation
 269        */
 270       g_object_unref (g_ptr_array_index (relation->target, i));
 271     }
 272     g_ptr_array_free (relation->target, TRUE);
 273   }
 274
 275   G_OBJECT_CLASS (parent_class)->finalize (object);
 276 }