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.
207 atk_focus_tracker_notify (AtkObject *object)
212 if (trackers == NULL)
215 if (object == previous_focus_object)
219 if (previous_focus_object)
220 g_object_unref (previous_focus_object);
222 previous_focus_object = object;
225 g_object_ref (object);
227 for (i = 0; i < trackers->len; i++)
229 item = &g_array_index (trackers, FocusTracker, i);
230 g_return_if_fail (item != NULL);
239 add_listener (GSignalEmissionHook listener,
240 const gchar *object_type,
241 const gchar *signal_name,
242 const gchar *detail_string,
243 const gchar *hook_data)
248 static gint listener_idx = 1;
249 GQuark detail_quark = 0;
251 type = g_type_from_name (object_type);
254 signal_id = g_signal_lookup (signal_name, type);
255 detail_quark = g_quark_from_string (detail_string);
259 AtkUtilListenerInfo *listener_info;
263 listener_info = g_new (AtkUtilListenerInfo, 1);
264 listener_info->key = listener_idx;
265 listener_info->hook_id =
266 g_signal_add_emission_hook (signal_id, detail_quark, listener,
267 g_strdup (hook_data),
268 (GDestroyNotify) g_free);
269 listener_info->signal_id = signal_id;
271 g_hash_table_insert(listener_list, &(listener_info->key), listener_info);
276 g_debug ("Signal type %s not supported\n", signal_name);
281 g_warning("Invalid object type %s\n", object_type);
287 atk_util_real_add_global_event_listener (GSignalEmissionHook listener,
288 const gchar *event_type)
291 gchar **split_string;
294 split_string = g_strsplit (event_type, ":", 0);
295 length = g_strv_length (split_string);
297 if ((length == 3) || (length == 4))
298 rc = add_listener (listener, split_string[1], split_string[2],
299 split_string[3], event_type);
301 g_strfreev (split_string);
307 atk_util_real_remove_global_event_listener (guint remove_listener)
309 if (remove_listener > 0)
311 AtkUtilListenerInfo *listener_info;
312 gint tmp_idx = remove_listener;
314 listener_info = (AtkUtilListenerInfo *)
315 g_hash_table_lookup(listener_list, &tmp_idx);
317 if (listener_info != NULL)
319 /* Hook id of 0 and signal id of 0 are invalid */
320 if (listener_info->hook_id != 0 && listener_info->signal_id != 0)
322 /* Remove the emission hook */
323 g_signal_remove_emission_hook(listener_info->signal_id,
324 listener_info->hook_id);
326 /* Remove the element from the hash */
327 g_hash_table_remove(listener_list, &tmp_idx);
331 g_warning("Invalid listener hook_id %ld or signal_id %d\n",
332 listener_info->hook_id, listener_info->signal_id);
337 g_warning("No listener with the specified listener id %d",
343 g_warning("Invalid listener_id %d", remove_listener);
349 * atk_add_global_event_listener:
350 * @listener: the listener to notify
351 * @event_type: the type of event for which notification is requested
353 * Adds the specified function to the list of functions to be called
354 * when an ATK event of type event_type occurs.
356 * The format of event_type is the following:
357 * "ATK:<atk_type>:<atk_event>:<atk_event_detail>
359 * Where "ATK" works as the namespace, <atk_interface> is the name of
360 * the ATK type (interface or object), <atk_event> is the name of the
361 * signal defined on that interface and <atk_event_detail> is the
362 * gsignal detail of that signal. You can find more info about gsignal
364 * http://developer.gnome.org/gobject/stable/gobject-Signals.html
366 * The first three parameters are mandatory. The last one is optional.
369 * ATK:AtkObject:state-change
370 * ATK:AtkText:text-selection-changed
371 * ATK:AtkText:text-insert:system
373 * Toolkit implementor note: ATK provides a default implementation for
374 * this virtual method. ATK implementors are discouraged from
375 * reimplementing this method.
377 * Toolkit implementor note: this method is not intended to be used by
378 * ATK implementors but by ATK consumers.
380 * ATK consumers note: as this method adds a listener for a given ATK
381 * type, that type should be already registered on the GType system
382 * before calling this method. A simple way to do that is creating an
383 * instance of #AtkNoOpObject. This class implements all ATK
384 * interfaces, so creating the instance will register all ATK types as
385 * a collateral effect.
387 * Returns: added event listener id, or 0 on failure.
390 atk_add_global_event_listener (GSignalEmissionHook listener,
391 const gchar *event_type)
394 AtkUtilClass *klass = g_type_class_ref (ATK_TYPE_UTIL);
396 if (klass->add_global_event_listener)
398 retval = klass->add_global_event_listener (listener, event_type);
404 g_type_class_unref (klass);
410 * atk_remove_global_event_listener:
411 * @listener_id: the id of the event listener to remove
413 * @listener_id is the value returned by #atk_add_global_event_listener
414 * when you registered that event listener.
416 * Toolkit implementor note: ATK provides a default implementation for
417 * this virtual method. ATK implementors are discouraged from
418 * reimplementing this method.
420 * Toolkit implementor note: this method is not intended to be used by
421 * ATK implementors but by ATK consumers.
423 * Removes the specified event listener
426 atk_remove_global_event_listener (guint listener_id)
428 AtkUtilClass *klass = g_type_class_peek (ATK_TYPE_UTIL);
430 if (klass && klass->remove_global_event_listener)
431 klass->remove_global_event_listener (listener_id);
435 * atk_add_key_event_listener:
436 * @listener: the listener to notify
437 * @data: a #gpointer that points to a block of data that should be sent to the registered listeners,
438 * along with the event notification, when it occurs.
440 * Adds the specified function to the list of functions to be called
441 * when a key event occurs. The @data element will be passed to the
442 * #AtkKeySnoopFunc (@listener) as the @func_data param, on notification.
444 * Returns: added event listener id, or 0 on failure.
447 atk_add_key_event_listener (AtkKeySnoopFunc listener, gpointer data)
450 AtkUtilClass *klass = g_type_class_peek (ATK_TYPE_UTIL);
451 if (klass && klass->add_key_event_listener)
453 retval = klass->add_key_event_listener (listener, data);
464 * atk_remove_key_event_listener:
465 * @listener_id: the id of the event listener to remove
467 * @listener_id is the value returned by #atk_add_key_event_listener
468 * when you registered that event listener.
470 * Removes the specified event listener.
473 atk_remove_key_event_listener (guint listener_id)
475 AtkUtilClass *klass = g_type_class_peek (ATK_TYPE_UTIL);
477 if (klass->remove_key_event_listener)
478 klass->remove_key_event_listener (listener_id);
484 * Gets the root accessible container for the current application.
486 * Returns: (transfer none): the root accessible container for the current
492 AtkUtilClass *klass = g_type_class_ref (ATK_TYPE_UTIL);
496 retval = klass->get_root ();
502 g_type_class_unref (klass);
508 * atk_get_focus_object:
510 * Gets the currently focused object.
514 * Returns: (transfer none): the currently focused object for the current
518 atk_get_focus_object (void)
520 return previous_focus_object;
524 * atk_get_toolkit_name:
526 * Gets name string for the GUI toolkit implementing ATK for this application.
528 * Returns: name string for the GUI toolkit implementing ATK for this application
531 atk_get_toolkit_name (void)
534 AtkUtilClass *klass = g_type_class_ref (ATK_TYPE_UTIL);
535 if (klass->get_toolkit_name)
537 retval = klass->get_toolkit_name ();
543 g_type_class_unref (klass);
549 * atk_get_toolkit_version:
551 * Gets version string for the GUI toolkit implementing ATK for this application.
553 * Returns: version string for the GUI toolkit implementing ATK for this application
556 atk_get_toolkit_version (void)
559 AtkUtilClass *klass = g_type_class_ref (ATK_TYPE_UTIL);
560 if (klass->get_toolkit_version)
562 retval = klass->get_toolkit_version ();
568 g_type_class_unref (klass);
576 * Gets the current version for ATK.
578 * Returns: version string for ATK
583 atk_get_version (void)
589 atk_util_class_init (AtkUtilClass *klass)
591 klass->add_global_event_listener = atk_util_real_add_global_event_listener;
592 klass->remove_global_event_listener = atk_util_real_remove_global_event_listener;
593 klass->get_root = NULL;
594 klass->get_toolkit_name = NULL;
595 klass->get_toolkit_version = NULL;
597 listener_list = g_hash_table_new_full (g_int_hash, g_int_equal, NULL,