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1// SimpleObserver.hh
2// Copyright (c) 2008 Fluxbox Team (fluxgen at fluxbox dot org)
3//
4// Permission is hereby granted, free of charge, to any person obtaining a
5// copy of this software and associated documentation files (the "Software"),
6// to deal in the Software without restriction, including without limitation
7// the rights to use, copy, modify, merge, publish, distribute, sublicense,
8// and/or sell copies of the Software, and to permit persons to whom the
9// Software is furnished to do so, subject to the following conditions:
10//
11// The above copyright notice and this permission notice shall be included in
12// all copies or substantial portions of the Software.
13//
14// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
19// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
20// DEALINGS IN THE SOFTWARE.
21
22#include "Observer.hh"
23#include "SimpleCommand.hh"
24
25namespace FbTk {
26
27/** Functor for observers, instead of using this directly use makeObserver.
28 * Usage:
29 * @code
30 * class SomeClass {
31 * public:
32 * void doAction();
33 * };
34 *
35 * SomeClass some;
36 *
37 * Observer* obs = makeProxyObserver(some, &SomeClass::doAction);
38 * SomeSubject subj;
39 * subj.attach(obs);
40 * @endcode
41 */
42template <typename Receiver>
43class SimpleObserver: public Observer {
44public:
45 typedef void (Receiver::* Action)();
46 SimpleObserver(Receiver &r, Action a):
47 m_receiver(r), m_action(a) {
48
49 }
50 void update(Subject *changedSubj) {
51 (m_receiver.*m_action)();
52 }
53private:
54 Receiver &m_receiver;
55 Action m_action;
56};
57
58// Helpers
59/** Creates an observer that takes no arguments.
60 * @param receiver The receiving instance.
61 * @param action A function in the receiving class.
62 * @return allocated simple observer. @see SimpleObserver
63 */
64template <typename Receiver, typename Action>
65Observer *makeObserver(Receiver &receiver, Action action) {
66 return new SimpleObserver<Receiver>( receiver, action );
67}
68
69}
70