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, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
23 #include "atkmarshal.c"
27 * @Short_description: A set of ATK utility functions for event and toolkit support.
30 * A set of ATK utility functions which are used to support event
31 * registration of various types, and obtaining the 'root' accessible
32 * of a process and information about the current ATK implementation
33 * and toolkit version.
36 static void atk_util_class_init (AtkUtilClass *klass);
38 static AtkObject *previous_focus_object = NULL;
40 typedef struct _AtkUtilListenerInfo AtkUtilListenerInfo;
41 struct _AtkUtilListenerInfo
47 static GHashTable *listener_list = NULL;
50 atk_util_get_type (void)
52 static GType type = 0;
56 static const GTypeInfo typeInfo =
58 sizeof (AtkUtilClass),
60 (GBaseFinalizeFunc) NULL,
61 (GClassInitFunc) atk_util_class_init,
62 (GClassFinalizeFunc) NULL,
66 (GInstanceInitFunc) NULL,
68 type = g_type_register_static (G_TYPE_OBJECT, "AtkUtil", &typeInfo, 0) ;
74 * This file supports the addition and removal of multiple focus handlers
75 * as long as they are all called in the same thread.
77 static AtkEventListenerInit focus_tracker_init = (AtkEventListenerInit) NULL;
79 static gboolean init_done = FALSE;
82 * Array of FocusTracker structs
84 static GArray *trackers = NULL;
85 static guint global_index = 0;
87 typedef struct _FocusTracker FocusTracker;
89 struct _FocusTracker {
91 AtkEventListener func;
95 * atk_focus_tracker_init:
96 * @init: Function to be called for focus tracker initialization
98 * Specifies the function to be called for focus tracker initialization.
99 * This function should be called by an implementation of the
100 * ATK interface if any specific work needs to be done to enable
103 * Deprecated: This method is deprecated since ATK version
104 * 2.9.4. Focus tracking has been dropped as a feature to be
105 * implemented by ATK itself.
109 atk_focus_tracker_init (AtkEventListenerInit init)
111 if (!focus_tracker_init)
112 focus_tracker_init = init;
116 * atk_add_focus_tracker:
117 * @focus_tracker: Function to be added to the list of functions to be called
118 * when an object receives focus.
120 * Adds the specified function to the list of functions to be called
121 * when an object receives focus.
123 * Deprecated: This method is deprecated since ATK version
124 * 2.9.4. Focus tracking has been dropped as a feature to be
125 * implemented by ATK itself. If you need focus tracking on your
126 * implementation, subscribe to the state-changed:focused signal.
128 * Returns: added focus tracker id, or 0 on failure.
131 atk_add_focus_tracker (AtkEventListener focus_tracker)
133 g_return_val_if_fail (focus_tracker, 0);
137 if (focus_tracker_init)
139 focus_tracker_init ();
141 trackers = g_array_sized_new (FALSE, TRUE, sizeof (FocusTracker), 0);
148 item.index = ++global_index;
149 item.func = focus_tracker;
150 trackers = g_array_append_val (trackers, item);
160 * atk_remove_focus_tracker:
161 * @tracker_id: the id of the focus tracker to remove
163 * Deprecated: This method is deprecated since ATK version
164 * 2.9.4. Focus tracking has been dropped as a feature to be
165 * implemented by ATK itself. If you need focus tracking on your
166 * implementation, subscribe to the state-changed:focused signal.
168 * Removes the specified focus tracker from the list of functions
169 * to be called when any object receives focus.
172 atk_remove_focus_tracker (guint tracker_id)
177 if (trackers == NULL)
183 for (i = 0; i < trackers->len; i++)
185 item = &g_array_index (trackers, FocusTracker, i);
186 if (item->index == tracker_id)
188 trackers = g_array_remove_index (trackers, i);
195 * atk_focus_tracker_notify:
196 * @object: an #AtkObject
198 * Cause the focus tracker functions which have been specified to be
199 * executed for the object.
201 * Deprecated: This method is deprecated since ATK version
202 * 2.9.4. Focus tracking has been dropped as a feature to be
203 * implemented by ATK itself. As #AtkObject::focus-event was
204 * deprecated in favor of a #AtkObject::state-change signal, in order
205 * to notify a focus change on your implementation, you can use
206 * atk_object_notify_state_change() instead.
210 atk_focus_tracker_notify (AtkObject *object)
215 if (trackers == NULL)
218 if (object == previous_focus_object)
222 if (previous_focus_object)
223 g_object_unref (previous_focus_object);
225 previous_focus_object = object;
228 g_object_ref (object);
230 for (i = 0; i < trackers->len; i++)
232 item = &g_array_index (trackers, FocusTracker, i);
233 g_return_if_fail (item != NULL);
242 add_listener (GSignalEmissionHook listener,
243 const gchar *object_type,
244 const gchar *signal_name,
245 const gchar *detail_string,
246 const gchar *hook_data)
251 static gint listener_idx = 1;
252 GQuark detail_quark = 0;
254 type = g_type_from_name (object_type);
257 signal_id = g_signal_lookup (signal_name, type);
258 detail_quark = g_quark_from_string (detail_string);
262 AtkUtilListenerInfo *listener_info;
266 listener_info = g_new (AtkUtilListenerInfo, 1);
267 listener_info->key = listener_idx;
268 listener_info->hook_id =
269 g_signal_add_emission_hook (signal_id, detail_quark, listener,
270 g_strdup (hook_data),
271 (GDestroyNotify) g_free);
272 listener_info->signal_id = signal_id;
274 g_hash_table_insert(listener_list, &(listener_info->key), listener_info);
279 g_debug ("Signal type %s not supported\n", signal_name);
284 g_warning("Invalid object type %s\n", object_type);
290 atk_util_real_add_global_event_listener (GSignalEmissionHook listener,
291 const gchar *event_type)
294 gchar **split_string;
297 split_string = g_strsplit (event_type, ":", 0);
298 length = g_strv_length (split_string);
300 if ((length == 3) || (length == 4))
301 rc = add_listener (listener, split_string[1], split_string[2],
302 split_string[3], event_type);
304 g_strfreev (split_string);
310 atk_util_real_remove_global_event_listener (guint remove_listener)
312 if (remove_listener > 0)
314 AtkUtilListenerInfo *listener_info;
315 gint tmp_idx = remove_listener;
317 listener_info = (AtkUtilListenerInfo *)
318 g_hash_table_lookup(listener_list, &tmp_idx);
320 if (listener_info != NULL)
322 /* Hook id of 0 and signal id of 0 are invalid */
323 if (listener_info->hook_id != 0 && listener_info->signal_id != 0)
325 /* Remove the emission hook */
326 g_signal_remove_emission_hook(listener_info->signal_id,
327 listener_info->hook_id);
329 /* Remove the element from the hash */
330 g_hash_table_remove(listener_list, &tmp_idx);
334 g_warning("Invalid listener hook_id %ld or signal_id %d\n",
335 listener_info->hook_id, listener_info->signal_id);
340 g_warning("No listener with the specified listener id %d",
346 g_warning("Invalid listener_id %d", remove_listener);
352 * atk_add_global_event_listener:
353 * @listener: the listener to notify
354 * @event_type: the type of event for which notification is requested
356 * Adds the specified function to the list of functions to be called
357 * when an ATK event of type event_type occurs.
359 * The format of event_type is the following:
360 * "ATK:<atk_type>:<atk_event>:<atk_event_detail>
362 * Where "ATK" works as the namespace, <atk_interface> is the name of
363 * the ATK type (interface or object), <atk_event> is the name of the
364 * signal defined on that interface and <atk_event_detail> is the
365 * gsignal detail of that signal. You can find more info about gsignal
367 * http://developer.gnome.org/gobject/stable/gobject-Signals.html
369 * The first three parameters are mandatory. The last one is optional.
372 * ATK:AtkObject:state-change
373 * ATK:AtkText:text-selection-changed
374 * ATK:AtkText:text-insert:system
376 * Toolkit implementor note: ATK provides a default implementation for
377 * this virtual method. ATK implementors are discouraged from
378 * reimplementing this method.
380 * Toolkit implementor note: this method is not intended to be used by
381 * ATK implementors but by ATK consumers.
383 * ATK consumers note: as this method adds a listener for a given ATK
384 * type, that type should be already registered on the GType system
385 * before calling this method. A simple way to do that is creating an
386 * instance of #AtkNoOpObject. This class implements all ATK
387 * interfaces, so creating the instance will register all ATK types as
388 * a collateral effect.
390 * Returns: added event listener id, or 0 on failure.
393 atk_add_global_event_listener (GSignalEmissionHook listener,
394 const gchar *event_type)
397 AtkUtilClass *klass = g_type_class_ref (ATK_TYPE_UTIL);
399 if (klass->add_global_event_listener)
401 retval = klass->add_global_event_listener (listener, event_type);
407 g_type_class_unref (klass);
413 * atk_remove_global_event_listener:
414 * @listener_id: the id of the event listener to remove
416 * @listener_id is the value returned by #atk_add_global_event_listener
417 * when you registered that event listener.
419 * Toolkit implementor note: ATK provides a default implementation for
420 * this virtual method. ATK implementors are discouraged from
421 * reimplementing this method.
423 * Toolkit implementor note: this method is not intended to be used by
424 * ATK implementors but by ATK consumers.
426 * Removes the specified event listener
429 atk_remove_global_event_listener (guint listener_id)
431 AtkUtilClass *klass = g_type_class_peek (ATK_TYPE_UTIL);
433 if (klass && klass->remove_global_event_listener)
434 klass->remove_global_event_listener (listener_id);
438 * atk_add_key_event_listener:
439 * @listener: the listener to notify
440 * @data: a #gpointer that points to a block of data that should be sent to the registered listeners,
441 * along with the event notification, when it occurs.
443 * Adds the specified function to the list of functions to be called
444 * when a key event occurs. The @data element will be passed to the
445 * #AtkKeySnoopFunc (@listener) as the @func_data param, on notification.
447 * Returns: added event listener id, or 0 on failure.
450 atk_add_key_event_listener (AtkKeySnoopFunc listener, gpointer data)
453 AtkUtilClass *klass = g_type_class_peek (ATK_TYPE_UTIL);
454 if (klass && klass->add_key_event_listener)
456 retval = klass->add_key_event_listener (listener, data);
467 * atk_remove_key_event_listener:
468 * @listener_id: the id of the event listener to remove
470 * @listener_id is the value returned by #atk_add_key_event_listener
471 * when you registered that event listener.
473 * Removes the specified event listener.
476 atk_remove_key_event_listener (guint listener_id)
478 AtkUtilClass *klass = g_type_class_peek (ATK_TYPE_UTIL);
480 if (klass->remove_key_event_listener)
481 klass->remove_key_event_listener (listener_id);
487 * Gets the root accessible container for the current application.
489 * Returns: (transfer none): the root accessible container for the current
495 AtkUtilClass *klass = g_type_class_ref (ATK_TYPE_UTIL);
499 retval = klass->get_root ();
505 g_type_class_unref (klass);
511 * atk_get_focus_object:
513 * Gets the currently focused object.
517 * Returns: (transfer none): the currently focused object for the current
521 atk_get_focus_object (void)
523 return previous_focus_object;
527 * atk_get_toolkit_name:
529 * Gets name string for the GUI toolkit implementing ATK for this application.
531 * Returns: name string for the GUI toolkit implementing ATK for this application
534 atk_get_toolkit_name (void)
537 AtkUtilClass *klass = g_type_class_ref (ATK_TYPE_UTIL);
538 if (klass->get_toolkit_name)
540 retval = klass->get_toolkit_name ();
546 g_type_class_unref (klass);
552 * atk_get_toolkit_version:
554 * Gets version string for the GUI toolkit implementing ATK for this application.
556 * Returns: version string for the GUI toolkit implementing ATK for this application
559 atk_get_toolkit_version (void)
562 AtkUtilClass *klass = g_type_class_ref (ATK_TYPE_UTIL);
563 if (klass->get_toolkit_version)
565 retval = klass->get_toolkit_version ();
571 g_type_class_unref (klass);
579 * Gets the current version for ATK.
581 * Returns: version string for ATK
586 atk_get_version (void)
592 atk_util_class_init (AtkUtilClass *klass)
594 klass->add_global_event_listener = atk_util_real_add_global_event_listener;
595 klass->remove_global_event_listener = atk_util_real_remove_global_event_listener;
596 klass->get_root = NULL;
597 klass->get_toolkit_name = NULL;
598 klass->get_toolkit_version = NULL;
600 listener_list = g_hash_table_new_full (g_int_hash, g_int_equal, NULL,