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.
21 #include "atkmarshal.c"
24 static void atk_util_class_init (AtkUtilClass *klass);
26 static AtkObject *previous_focus_object = NULL;
28 typedef struct _AtkUtilListenerInfo AtkUtilListenerInfo;
29 struct _AtkUtilListenerInfo
35 static GHashTable *listener_list = NULL;
38 atk_util_get_type (void)
40 static GType type = 0;
44 static const GTypeInfo typeInfo =
46 sizeof (AtkUtilClass),
48 (GBaseFinalizeFunc) NULL,
49 (GClassInitFunc) atk_util_class_init,
50 (GClassFinalizeFunc) NULL,
54 (GInstanceInitFunc) NULL,
56 type = g_type_register_static (G_TYPE_OBJECT, "AtkUtil", &typeInfo, 0) ;
62 * This file supports the addition and removal of multiple focus handlers
63 * as long as they are all called in the same thread.
65 static AtkEventListenerInit focus_tracker_init = (AtkEventListenerInit) NULL;
67 static gboolean init_done = FALSE;
70 * Array of FocusTracker structs
72 static GArray *trackers = NULL;
73 static guint global_index = 0;
75 typedef struct _FocusTracker FocusTracker;
77 struct _FocusTracker {
79 AtkEventListener func;
83 * atk_focus_tracker_init:
84 * @init: Function to be called for focus tracker initialization
86 * Specifies the function to be called for focus tracker initialization.
87 * This function should be called by an implementation of the
88 * ATK interface if any specific work needs to be done to enable
92 atk_focus_tracker_init (AtkEventListenerInit init)
94 if (!focus_tracker_init)
95 focus_tracker_init = init;
99 * atk_add_focus_tracker:
100 * @focus_tracker: Function to be added to the list of functions to be called
101 * when an object receives focus.
103 * Adds the specified function to the list of functions to be called
104 * when an object receives focus.
106 * Returns: added focus tracker id, or 0 on failure.
109 atk_add_focus_tracker (AtkEventListener focus_tracker)
111 g_return_val_if_fail (focus_tracker, 0);
115 if (focus_tracker_init)
117 focus_tracker_init ();
119 trackers = g_array_sized_new (FALSE, TRUE, sizeof (FocusTracker), 0);
126 item.index = ++global_index;
127 item.func = focus_tracker;
128 trackers = g_array_append_val (trackers, item);
138 * atk_remove_focus_tracker:
139 * @tracker_id: the id of the focus tracker to remove
141 * Removes the specified focus tracker from the list of functions
142 * to be called when any object receives focus.
145 atk_remove_focus_tracker (guint tracker_id)
150 if (trackers == NULL)
156 for (i = 0; i < trackers->len; i++)
158 item = &g_array_index (trackers, FocusTracker, i);
159 if (item->index == tracker_id)
161 trackers = g_array_remove_index (trackers, i);
168 * atk_focus_tracker_notify:
169 * @object: an #AtkObject
171 * Cause the focus tracker functions which have been specified to be
172 * executed for the object.
175 atk_focus_tracker_notify (AtkObject *object)
180 if (trackers == NULL)
183 if (object == previous_focus_object)
187 if (previous_focus_object)
188 g_object_unref (previous_focus_object);
190 previous_focus_object = object;
193 g_object_ref (object);
195 for (i = 0; i < trackers->len; i++)
197 item = &g_array_index (trackers, FocusTracker, i);
198 g_return_if_fail (item != NULL);
207 add_listener (GSignalEmissionHook listener,
208 const gchar *object_type,
209 const gchar *signal_name,
210 const gchar *hook_data)
215 static gint listener_idx = 1;
217 type = g_type_from_name (object_type);
220 signal_id = g_signal_lookup (signal_name, type);
223 AtkUtilListenerInfo *listener_info;
227 listener_info = g_new (AtkUtilListenerInfo, 1);
228 listener_info->key = listener_idx;
229 listener_info->hook_id =
230 g_signal_add_emission_hook (signal_id, 0, listener,
231 g_strdup (hook_data),
232 (GDestroyNotify) g_free);
233 listener_info->signal_id = signal_id;
235 g_hash_table_insert(listener_list, &(listener_info->key), listener_info);
240 g_debug ("Signal type %s not supported\n", signal_name);
245 g_warning("Invalid object type %s\n", object_type);
251 atk_util_real_add_global_event_listener (GSignalEmissionHook listener,
252 const gchar *event_type)
255 gchar **split_string;
257 split_string = g_strsplit (event_type, ":", 3);
259 if (g_strv_length (split_string) == 3)
260 rc = add_listener (listener, split_string[1], split_string[2], event_type);
262 g_strfreev (split_string);
268 atk_util_real_remove_global_event_listener (guint remove_listener)
270 if (remove_listener > 0)
272 AtkUtilListenerInfo *listener_info;
273 gint tmp_idx = remove_listener;
275 listener_info = (AtkUtilListenerInfo *)
276 g_hash_table_lookup(listener_list, &tmp_idx);
278 if (listener_info != NULL)
280 /* Hook id of 0 and signal id of 0 are invalid */
281 if (listener_info->hook_id != 0 && listener_info->signal_id != 0)
283 /* Remove the emission hook */
284 g_signal_remove_emission_hook(listener_info->signal_id,
285 listener_info->hook_id);
287 /* Remove the element from the hash */
288 g_hash_table_remove(listener_list, &tmp_idx);
292 g_warning("Invalid listener hook_id %ld or signal_id %d\n",
293 listener_info->hook_id, listener_info->signal_id);
298 g_warning("No listener with the specified listener id %d",
304 g_warning("Invalid listener_id %d", remove_listener);
310 * atk_add_global_event_listener:
311 * @listener: the listener to notify
312 * @event_type: the type of event for which notification is requested
314 * Adds the specified function to the list of functions to be called
315 * when an ATK event of type event_type occurs.
317 * The format of event_type is the following:
318 * "ATK:<atk_type>:<atk_event>
320 * Where "ATK" works as the namespace, <atk_interface> is the name of
321 * the ATK type (interface or object) and <atk_event> is the name of
322 * the signal defined on that interface.
325 * ATK:AtkObject:state-change
326 * ATK:AtkText:text-selection-changed
328 * Toolkit implementor note: Atk provides a default implementation for
329 * this virtual method, and that implementation should be enough for
330 * most of the cases. You should have a really good reason to
331 * reimplement this method.
333 * Returns: added event listener id, or 0 on failure.
336 atk_add_global_event_listener (GSignalEmissionHook listener,
337 const gchar *event_type)
340 AtkUtilClass *klass = g_type_class_ref (ATK_TYPE_UTIL);
342 if (klass->add_global_event_listener)
344 retval = klass->add_global_event_listener (listener, event_type);
350 g_type_class_unref (klass);
356 * atk_remove_global_event_listener:
357 * @listener_id: the id of the event listener to remove
359 * @listener_id is the value returned by #atk_add_global_event_listener
360 * when you registered that event listener.
362 * Toolkit implementor note: Atk provides a default implementation for
363 * this virtual method, and that implementation should be enough for
364 * most of the cases. You should have a really good reason to
365 * reimplement this method.
367 * Removes the specified event listener
370 atk_remove_global_event_listener (guint listener_id)
372 AtkUtilClass *klass = g_type_class_peek (ATK_TYPE_UTIL);
374 if (klass && klass->remove_global_event_listener)
375 klass->remove_global_event_listener (listener_id);
379 * atk_add_key_event_listener:
380 * @listener: the listener to notify
381 * @data: a #gpointer that points to a block of data that should be sent to the registered listeners,
382 * along with the event notification, when it occurs.
384 * Adds the specified function to the list of functions to be called
385 * when a key event occurs. The @data element will be passed to the
386 * #AtkKeySnoopFunc (@listener) as the @func_data param, on notification.
388 * Returns: added event listener id, or 0 on failure.
391 atk_add_key_event_listener (AtkKeySnoopFunc listener, gpointer data)
394 AtkUtilClass *klass = g_type_class_peek (ATK_TYPE_UTIL);
395 if (klass && klass->add_key_event_listener)
397 retval = klass->add_key_event_listener (listener, data);
408 * atk_remove_key_event_listener:
409 * @listener_id: the id of the event listener to remove
411 * @listener_id is the value returned by #atk_add_key_event_listener
412 * when you registered that event listener.
414 * Removes the specified event listener.
417 atk_remove_key_event_listener (guint listener_id)
419 AtkUtilClass *klass = g_type_class_peek (ATK_TYPE_UTIL);
421 if (klass->remove_key_event_listener)
422 klass->remove_key_event_listener (listener_id);
428 * Gets the root accessible container for the current application.
430 * Returns: (transfer none): the root accessible container for the current
436 AtkUtilClass *klass = g_type_class_ref (ATK_TYPE_UTIL);
440 retval = klass->get_root ();
446 g_type_class_unref (klass);
452 * atk_get_focus_object:
454 * Gets the currently focused object.
458 * Returns: (transfer none): the currently focused object for the current
462 atk_get_focus_object (void)
464 return previous_focus_object;
468 * atk_get_toolkit_name:
470 * Gets name string for the GUI toolkit implementing ATK for this application.
472 * Returns: name string for the GUI toolkit implementing ATK for this application
475 atk_get_toolkit_name (void)
478 AtkUtilClass *klass = g_type_class_ref (ATK_TYPE_UTIL);
479 if (klass->get_toolkit_name)
481 retval = klass->get_toolkit_name ();
487 g_type_class_unref (klass);
493 * atk_get_toolkit_version:
495 * Gets version string for the GUI toolkit implementing ATK for this application.
497 * Returns: version string for the GUI toolkit implementing ATK for this application
500 atk_get_toolkit_version (void)
503 AtkUtilClass *klass = g_type_class_ref (ATK_TYPE_UTIL);
504 if (klass->get_toolkit_version)
506 retval = klass->get_toolkit_version ();
512 g_type_class_unref (klass);
520 * Gets the current version for ATK.
522 * Returns: version string for ATK
527 atk_get_version (void)
533 atk_util_class_init (AtkUtilClass *klass)
535 klass->add_global_event_listener = atk_util_real_add_global_event_listener;
536 klass->remove_global_event_listener = atk_util_real_remove_global_event_listener;
537 klass->get_root = NULL;
538 klass->get_toolkit_name = NULL;
539 klass->get_toolkit_version = NULL;
541 listener_list = g_hash_table_new_full (g_int_hash, g_int_equal, NULL,