1 /* ATK - Accessibility Toolkit
2 * Copyright 2001 Sun Microsystems Inc.
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.
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.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
19 #include <glib-object.h>
24 * @Short_description: An object used to describe a relation between a
25 * object and one or more other objects.
28 * An AtkRelation describes a relation between an object and one or
29 * more other objects. The actual relations that an object has with
30 * other objects are defined as an AtkRelationSet, which is a set of
41 static GPtrArray *extra_names = NULL;
43 static gpointer parent_class = NULL;
45 static void atk_relation_class_init (AtkRelationClass *klass);
46 static void atk_relation_finalize (GObject *object);
47 static void atk_relation_set_property (GObject *object,
51 static void atk_relation_get_property (GObject *object,
56 static GPtrArray* atk_relation_get_ptr_array_from_value_array (GValueArray *array);
57 static GValueArray* atk_relation_get_value_array_from_ptr_array (GPtrArray *array);
60 atk_relation_get_type (void)
62 static GType type = 0;
66 static const GTypeInfo typeInfo =
68 sizeof (AtkRelationClass),
70 (GBaseFinalizeFunc) NULL,
71 (GClassInitFunc) atk_relation_class_init,
72 (GClassFinalizeFunc) NULL,
76 (GInstanceInitFunc) NULL,
78 type = g_type_register_static (G_TYPE_OBJECT, "AtkRelation", &typeInfo, 0) ;
84 atk_relation_class_init (AtkRelationClass *klass)
86 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
88 parent_class = g_type_class_peek_parent (klass);
90 gobject_class->finalize = atk_relation_finalize;
91 gobject_class->set_property = atk_relation_set_property;
92 gobject_class->get_property = atk_relation_get_property;
94 g_object_class_install_property (gobject_class,
96 g_param_spec_enum ("relation_type",
98 "The type of the relation",
99 ATK_TYPE_RELATION_TYPE,
102 g_object_class_install_property (gobject_class,
104 g_param_spec_value_array ("target",
106 "An array of the targets for the relation",
113 * atk_relation_type_register:
114 * @name: a name string
116 * Associate @name with a new #AtkRelationType
118 * Returns: an #AtkRelationType associated with @name
121 atk_relation_type_register (const gchar *name)
123 g_return_val_if_fail (name, ATK_RELATION_NULL);
126 extra_names = g_ptr_array_new ();
128 g_ptr_array_add (extra_names, g_strdup (name));
129 return extra_names->len + ATK_RELATION_LAST_DEFINED;
133 * atk_relation_type_get_name:
134 * @type: The #AtkRelationType whose name is required
136 * Gets the description string describing the #AtkRelationType @type.
138 * Returns: the string describing the AtkRelationType
141 atk_relation_type_get_name (AtkRelationType type)
143 GTypeClass *type_class;
145 const gchar *name = NULL;
147 type_class = g_type_class_ref (ATK_TYPE_RELATION_TYPE);
148 g_return_val_if_fail (G_IS_ENUM_CLASS (type_class), NULL);
150 value = g_enum_get_value (G_ENUM_CLASS (type_class), type);
154 name = value->value_nick;
162 n -= ATK_RELATION_LAST_DEFINED + 1;
164 if (n < extra_names->len)
165 name = g_ptr_array_index (extra_names, n);
168 g_type_class_unref (type_class);
173 * atk_relation_type_for_name:
174 * @name: a string which is the (non-localized) name of an ATK relation type.
176 * Get the #AtkRelationType type corresponding to a relation name.
178 * Returns: the #AtkRelationType enumerated type corresponding to the specified name,
179 * or #ATK_RELATION_NULL if no matching relation type is found.
182 atk_relation_type_for_name (const gchar *name)
184 GTypeClass *type_class;
186 AtkRelationType type = ATK_RELATION_NULL;
188 g_return_val_if_fail (name, ATK_RELATION_NULL);
190 type_class = g_type_class_ref (ATK_TYPE_RELATION_TYPE);
191 g_return_val_if_fail (G_IS_ENUM_CLASS (type_class), ATK_RELATION_NULL);
193 value = g_enum_get_value_by_nick (G_ENUM_CLASS (type_class), name);
205 for (i = 0; i < extra_names->len; i++)
207 gchar *extra_name = (gchar *)g_ptr_array_index (extra_names, i);
209 g_return_val_if_fail (extra_name, ATK_RELATION_NULL);
211 if (strcmp (name, extra_name) == 0)
213 type = i + 1 + ATK_RELATION_LAST_DEFINED;
219 g_type_class_unref (type_class);
227 * @targets: (array length=n_targets): an array of pointers to
229 * @n_targets: number of #AtkObjects pointed to by @targets
230 * @relationship: an #AtkRelationType with which to create the new
233 * Create a new relation for the specified key and the specified list
234 * of targets. See also atk_object_add_relationship().
236 * Returns: a pointer to a new #AtkRelation
239 atk_relation_new (AtkObject **targets,
241 AtkRelationType relationship)
243 AtkRelation *relation;
248 g_return_val_if_fail (targets != NULL, NULL);
250 array = g_value_array_new (n_targets);
251 for (i = 0; i < n_targets; i++)
253 value = g_new0 (GValue, 1);
254 g_value_init (value, ATK_TYPE_OBJECT);
255 g_value_set_object (value, targets[i]);
256 array = g_value_array_append (array, value);
257 g_value_unset (value);
261 relation = g_object_new (ATK_TYPE_RELATION,
262 "relation_type", relationship,
266 g_value_array_free (array);
272 * atk_relation_get_relation_type:
273 * @relation: an #AtkRelation
275 * Gets the type of @relation
277 * Returns: the type of @relation
280 atk_relation_get_relation_type (AtkRelation *relation)
282 g_return_val_if_fail (ATK_IS_RELATION (relation), 0);
284 return relation->relationship;
288 * atk_relation_get_target:
289 * @relation: an #AtkRelation
291 * Gets the target list of @relation
293 * Returns: (transfer none) (element-type Atk.Object): the target list of @relation
296 atk_relation_get_target (AtkRelation *relation)
298 g_return_val_if_fail (ATK_IS_RELATION (relation), NULL);
300 return relation->target;
304 delete_object_while_in_relation (gpointer callback_data,
305 GObject *where_the_object_was)
309 g_assert (callback_data != NULL);
311 array = callback_data;
312 g_ptr_array_remove (array, where_the_object_was);
316 * atk_relation_add_target:
317 * @relation: an #AtkRelation
318 * @target: an #AtkObject
320 * Adds the specified AtkObject to the target for the relation, if it is
321 * not already present. See also atk_object_add_relationship().
327 atk_relation_add_target (AtkRelation *relation,
332 g_return_if_fail (ATK_IS_RELATION (relation));
333 g_return_if_fail (ATK_IS_OBJECT (target));
335 /* first check if target occurs in array ... */
336 for (i = 0; i < relation->target->len; i++)
337 if (g_ptr_array_index(relation->target, i) == target)
340 g_ptr_array_add (relation->target, target);
341 g_object_weak_ref (G_OBJECT (target), (GWeakNotify) delete_object_while_in_relation, relation->target);
345 * atk_relation_remove_target:
346 * @relation: an #AtkRelation
347 * @target: an #AtkObject
349 * Remove the specified AtkObject from the target for the relation.
351 * Returns: TRUE if the removal is successful.
355 atk_relation_remove_target (AtkRelation *relation,
358 gboolean ret = FALSE;
361 array = atk_relation_get_target (relation);
363 if (array && g_ptr_array_remove (array, target))
365 g_object_weak_unref (G_OBJECT (target),
366 (GWeakNotify) delete_object_while_in_relation,
374 atk_relation_finalize (GObject *object)
376 AtkRelation *relation;
378 g_return_if_fail (ATK_IS_RELATION (object));
380 relation = ATK_RELATION (object);
382 if (relation->target)
386 for (i = 0; i < relation->target->len; i++)
388 g_object_weak_unref (G_OBJECT (g_ptr_array_index (relation->target, i)),
389 (GWeakNotify) delete_object_while_in_relation,
392 g_ptr_array_free (relation->target, TRUE);
395 G_OBJECT_CLASS (parent_class)->finalize (object);
399 atk_relation_set_property (GObject *object,
404 AtkRelation *relation;
407 relation = ATK_RELATION (object);
411 case PROP_RELATION_TYPE:
412 relation->relationship = g_value_get_enum (value);
415 if (relation->target)
419 for (i = 0; i < relation->target->len; i++)
421 g_object_weak_unref (G_OBJECT (g_ptr_array_index (relation->target, i)),
422 (GWeakNotify) delete_object_while_in_relation,
425 g_ptr_array_free (relation->target, TRUE);
427 boxed = g_value_get_boxed (value);
428 relation->target = atk_relation_get_ptr_array_from_value_array ( (GValueArray *) boxed);
436 atk_relation_get_property (GObject *object,
441 AtkRelation *relation;
444 relation = ATK_RELATION (object);
448 case PROP_RELATION_TYPE:
449 g_value_set_enum (value, relation->relationship);
452 array = atk_relation_get_value_array_from_ptr_array (relation->target);
453 g_value_set_boxed (value, array);
456 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
462 atk_relation_get_ptr_array_from_value_array (GValueArray *array)
465 GPtrArray *return_array;
469 return_array = g_ptr_array_sized_new (array->n_values);
470 for (i = 0; i < array->n_values; i++)
472 value = g_value_array_get_nth (array, i);
473 obj = g_value_get_object (value);
474 g_ptr_array_add (return_array, obj);
475 g_object_weak_ref (obj, (GWeakNotify) delete_object_while_in_relation, return_array);
482 atk_relation_get_value_array_from_ptr_array (GPtrArray *array)
485 GValueArray *return_array;
488 return_array = g_value_array_new (array->len);
489 for (i = 0; i < array->len; i++)
491 value = g_new0 (GValue, 1);
492 g_value_init (value, ATK_TYPE_OBJECT);
493 g_value_set_object (value, g_ptr_array_index (array, i));
494 return_array = g_value_array_append (return_array, value);