2 * AT-SPI - Assistive Technology Service Provider Interface
3 * (Gnome Accessibility Project; http://developer.gnome.org/projects/gap)
5 * Copyright 2009, 2010 Codethink Ltd.
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
25 #include "accessible-cache.h"
26 #include "accessible-register.h"
29 SpiCache *spi_global_cache = NULL;
32 child_added_listener (GSignalInvocationHint * signal_hint,
34 const GValue * param_values, gpointer data);
37 toplevel_added_listener (AtkObject * accessible,
38 guint index, AtkObject * child);
41 remove_object (GObject * source, GObject * gobj, gpointer data);
44 add_object (SpiCache * cache, GObject * gobj);
47 add_subtree (SpiCache *cache, AtkObject * accessible);
50 add_pending_items (gpointer data);
52 /*---------------------------------------------------------------------------*/
55 spi_cache_finalize (GObject * object);
58 spi_cache_dispose (GObject * object);
60 /*---------------------------------------------------------------------------*/
68 static guint cache_signals[LAST_SIGNAL] = { 0 };
70 /*---------------------------------------------------------------------------*/
72 G_DEFINE_TYPE (SpiCache, spi_cache, G_TYPE_OBJECT)
74 static void spi_cache_class_init (SpiCacheClass * klass)
76 GObjectClass *object_class = (GObjectClass *) klass;
78 spi_cache_parent_class = g_type_class_ref (G_TYPE_OBJECT);
80 object_class->finalize = spi_cache_finalize;
81 object_class->dispose = spi_cache_dispose;
83 cache_signals [OBJECT_ADDED] = \
84 g_signal_new ("object-added",
90 g_cclosure_marshal_VOID__OBJECT,
95 cache_signals [OBJECT_REMOVED] = \
96 g_signal_new ("object-removed",
102 g_cclosure_marshal_VOID__OBJECT,
109 spi_cache_init (SpiCache * cache)
111 cache->objects = g_hash_table_new (g_direct_hash, g_direct_equal);
112 cache->add_traversal = g_queue_new ();
115 if (g_thread_supported ())
116 g_message ("AT-SPI: Threads enabled");
118 g_debug ("AT-SPI: Initial Atk tree regisration");
121 g_signal_connect (spi_global_register,
122 "object-deregistered",
123 (GCallback) remove_object, cache);
125 add_subtree (cache, spi_global_app_data->root);
127 atk_add_global_event_listener (child_added_listener,
128 "Gtk:AtkObject:children-changed");
130 g_signal_connect (G_OBJECT (spi_global_app_data->root),
131 "children-changed::add",
132 (GCallback) toplevel_added_listener, NULL);
136 spi_cache_finalize (GObject * object)
138 SpiCache *cache = SPI_CACHE (object);
140 while (!g_queue_is_empty (cache->add_traversal))
141 g_object_unref (G_OBJECT (g_queue_pop_head (cache->add_traversal)));
142 g_queue_free (cache->add_traversal);
143 g_free (cache->objects);
145 G_OBJECT_CLASS (spi_cache_parent_class)->finalize (object);
149 spi_cache_dispose (GObject * object)
151 SpiCache *cache = SPI_CACHE (object);
153 G_OBJECT_CLASS (spi_cache_parent_class)->dispose (object);
156 /*---------------------------------------------------------------------------*/
159 remove_object (GObject * source, GObject * gobj, gpointer data)
161 SpiCache *cache = SPI_CACHE (data);
163 if (spi_cache_in (cache, gobj))
166 g_debug ("CACHE REM - %s - %d - %s\n", atk_object_get_name (ATK_OBJECT (gobj)),
167 atk_object_get_role (ATK_OBJECT (gobj)),
168 spi_register_object_to_path (spi_global_register, gobj));
170 g_signal_emit (cache, cache_signals [OBJECT_REMOVED], 0, gobj);
171 g_hash_table_remove (cache->objects, gobj);
176 add_object (SpiCache * cache, GObject * gobj)
178 g_return_if_fail (G_IS_OBJECT (gobj));
180 g_hash_table_insert (cache->objects, gobj, NULL);
183 g_debug ("CACHE ADD - %s - %d - %s\n", atk_object_get_name (ATK_OBJECT (gobj)),
184 atk_object_get_role (ATK_OBJECT (gobj)),
185 spi_register_object_to_path (spi_global_register, gobj));
188 g_signal_emit (cache, cache_signals [OBJECT_ADDED], 0, gobj);
191 /*---------------------------------------------------------------------------*/
193 static GStaticRecMutex cache_mutex = G_STATIC_REC_MUTEX_INIT;
194 static GStaticMutex recursion_check_guard = G_STATIC_MUTEX_INIT;
196 static gboolean recursion_check = FALSE;
199 recursion_check_and_set ()
202 g_static_mutex_lock (&recursion_check_guard);
203 ret = recursion_check;
204 recursion_check = TRUE;
205 g_static_mutex_unlock (&recursion_check_guard);
210 recursion_check_unset ()
212 g_static_mutex_lock (&recursion_check_guard);
213 recursion_check = FALSE;
214 g_static_mutex_unlock (&recursion_check_guard);
217 /*---------------------------------------------------------------------------*/
220 append_children (AtkObject * accessible, GQueue * traversal)
224 gint count = atk_object_get_n_accessible_children (accessible);
228 for (i = 0; i < count; i++)
230 current = atk_object_ref_accessible_child (accessible, i);
233 g_queue_push_tail (traversal, current);
239 * Adds a subtree of accessible objects
240 * to the cache at the accessible object provided.
242 * The leaf nodes do not have their children
243 * registered. A node is considered a leaf
244 * if it has the state "manages-descendants"
245 * or if it has already been registered.
248 add_subtree (SpiCache *cache, AtkObject * accessible)
250 g_return_if_fail (ATK_IS_OBJECT (accessible));
252 g_object_ref (accessible);
253 g_queue_push_tail (cache->add_traversal, accessible);
254 add_pending_items (cache);
258 add_pending_items (gpointer data)
260 SpiCache *cache = SPI_CACHE (data);
264 to_add = g_queue_new ();
266 while (!g_queue_is_empty (cache->add_traversal))
270 current = g_queue_pop_head (cache->add_traversal);
271 set = atk_object_ref_state_set (current);
273 if (!atk_state_set_contains_state (set, ATK_STATE_TRANSIENT))
275 g_queue_push_tail (to_add, current);
276 if (!spi_cache_in (cache, G_OBJECT (current)) &&
277 !atk_state_set_contains_state (set, ATK_STATE_MANAGES_DESCENDANTS))
279 append_children (current, cache->add_traversal);
283 g_object_unref (set);
286 while (!g_queue_is_empty (to_add))
288 current = g_queue_pop_head (to_add);
289 add_object (cache, G_OBJECT(current));
290 g_object_unref (G_OBJECT (current));
293 g_queue_free (to_add);
294 cache->add_pending_idle = 0;
298 /*---------------------------------------------------------------------------*/
301 child_added_listener (GSignalInvocationHint * signal_hint,
302 guint n_param_values,
303 const GValue * param_values, gpointer data)
305 SpiCache *cache = spi_global_cache;
307 AtkObject *accessible;
310 const gchar *detail = NULL;
312 g_static_rec_mutex_lock (&cache_mutex);
315 * Ensure that only accessibles already in the cache
316 * have their signals processed.
318 accessible = ATK_OBJECT (g_value_get_object (¶m_values[0]));
319 g_return_val_if_fail (ATK_IS_OBJECT (accessible), TRUE);
321 if (spi_cache_in (cache, G_OBJECT(accessible)))
324 if (recursion_check_and_set ())
325 g_warning ("AT-SPI: Recursive use of cache module");
327 g_debug ("AT-SPI: Tree update listener");
329 if (signal_hint->detail)
330 detail = g_quark_to_string (signal_hint->detail);
332 if (!g_strcmp0 (detail, "add"))
335 int index = g_value_get_uint (param_values + 1);
336 child = g_value_get_pointer (param_values + 2);
338 if (!ATK_IS_OBJECT (child))
340 child = atk_object_ref_accessible_child (accessible, index);
342 g_object_ref (child);
343 g_queue_push_tail (cache->add_traversal, child);
345 if (cache->add_pending_idle == 0)
346 cache->add_pending_idle = g_idle_add (add_pending_items, cache);
349 recursion_check_unset ();
353 g_static_rec_mutex_unlock (&cache_mutex);
358 /*---------------------------------------------------------------------------*/
361 toplevel_added_listener (AtkObject * accessible,
362 guint index, AtkObject * child)
364 SpiCache *cache = spi_global_cache;
366 g_static_rec_mutex_lock (&cache_mutex);
368 g_return_if_fail (ATK_IS_OBJECT (accessible));
370 if (spi_cache_in (cache, G_OBJECT(accessible)))
373 if (recursion_check_and_set ())
374 g_warning ("AT-SPI: Recursive use of registration module");
376 g_debug ("AT-SPI: Toplevel added listener");
378 if (!ATK_IS_OBJECT (child))
380 child = atk_object_ref_accessible_child (accessible, index);
383 g_object_ref (child);
385 g_queue_push_tail (cache->add_traversal, child);
387 if (cache->add_pending_idle == 0)
388 cache->add_pending_idle = g_idle_add (add_pending_items, cache);
390 recursion_check_unset ();
394 g_static_rec_mutex_unlock (&cache_mutex);
397 /*---------------------------------------------------------------------------*/
400 spi_cache_foreach (SpiCache * cache, GHFunc func, gpointer data)
402 g_hash_table_foreach (cache->objects, func, data);
406 spi_cache_in (SpiCache * cache, GObject * object)
408 if (g_hash_table_lookup_extended (cache->objects,
419 spi_cache_print_info (GObject * obj)
421 char * path = spi_register_object_to_path (spi_global_register, obj);
423 if (spi_cache_in (spi_global_cache, obj))
424 g_printf ("%s IC\n", path);
426 g_printf ("%s NC\n", path);
433 /*END------------------------------------------------------------------------*/