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1 /*
2 * Copyright Š 2011 Canonical Limited
3 *
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU Lesser General Public License as
6 * published by the Free Software Foundation; either version 2 of the
7 * licence or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful, but
10 * 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.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307,
17 * USA.
18 *
19 * Authors: Ryan Lortie <desrt@desrt.ca>
20 */
21
22 #include "config.h"
23
24 #include "gactionobservable.h"
25
26 G_DEFINE_INTERFACE (GActionObservable, g_action_observable, G_TYPE_OBJECT)
27
28 /*
29 * SECTION:gactionobserable
30 * @short_description: an interface implemented by objects that report
31 * changes to actions
32 */
33
34 void
35 g_action_observable_default_init (GActionObservableInterface *iface)
36 {
37 }
38
39 /*
40 * g_action_observable_register_observer:
41 * @observable: a #GActionObservable
42 * @action_name: the name of the action
43 * @observer: the #GActionObserver to which the events will be reported
44 *
45 * Registers @observer as being interested in changes to @action_name on
46 * @observable.
47 */
48 void
49 g_action_observable_register_observer (GActionObservable *observable,
50 const gchar *action_name,
51 GActionObserver *observer)
52 {
53 g_return_if_fail (G_IS_ACTION_OBSERVABLE (observable));
54
55 G_ACTION_OBSERVABLE_GET_IFACE (observable)
56 ->register_observer (observable, action_name, observer);
57 }
58
59 /*
60 * g_action_observable_unregister_observer:
61 * @observable: a #GActionObservable
62 * @action_name: the name of the action
63 * @observer: the #GActionObserver to which the events will be reported
64 *
65 * Removes the registration of @observer as being interested in changes
66 * to @action_name on @observable.
67 *
68 * If the observer was registered multiple times, it must be
69 * unregistered an equal number of times.
70 */
71 void
72 g_action_observable_unregister_observer (GActionObservable *observable,
73 const gchar *action_name,
74 GActionObserver *observer)
75 {
76 g_return_if_fail (G_IS_ACTION_OBSERVABLE (observable));
77
78 G_ACTION_OBSERVABLE_GET_IFACE (observable)
79 ->unregister_observer (observable, action_name, observer);
80 }