pref_set_observer.h revision 731df977c0511bca2206b5f333555b1205ff1f43 
1// Copyright (c) 2010 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef CHROME_BROWSER_PREFS_PREF_SET_OBSERVER_H_
6#define CHROME_BROWSER_PREFS_PREF_SET_OBSERVER_H_
7#pragma once
8
9#include <set>
10
11#include "base/basictypes.h"
12#include "chrome/browser/prefs/pref_service.h"
13#include "chrome/browser/prefs/pref_change_registrar.h"
14#include "chrome/common/notification_observer.h"
15
16// Observes the state of a set of preferences and allows to query their combined
17// managed bits.
18class PrefSetObserver : public NotificationObserver {
19 public:
20  // Initialize with an empty set of preferences.
21  PrefSetObserver(PrefService* pref_service,
22                  NotificationObserver* observer);
23  virtual ~PrefSetObserver();
24
25  // Add a |pref| to the set of preferences to observe.
26  void AddPref(const std::string& pref);
27  // Remove |pref| from the set of observed peferences.
28  void RemovePref(const std::string& pref);
29
30  // Check whether |pref| is in the set of observed preferences.
31  bool IsObserved(const std::string& pref);
32  // Check whether any of the observed preferences has the managed bit set.
33  bool IsManaged();
34
35  // Create a pref set observer for all preferences relevant to proxies.
36  static PrefSetObserver* CreateProxyPrefSetObserver(
37      PrefService* pref_service,
38      NotificationObserver* observer);
39
40  // Create a pref set observer for all preferences relevant to default search.
41  static PrefSetObserver* CreateDefaultSearchPrefSetObserver(
42      PrefService* pref_service,
43      NotificationObserver* observer);
44
45 private:
46  // Overridden from NotificationObserver.
47  virtual void Observe(NotificationType type,
48                       const NotificationSource& source,
49                       const NotificationDetails& details);
50
51  typedef std::set<std::string> PrefSet;
52  PrefSet prefs_;
53
54  PrefService* pref_service_;
55  PrefChangeRegistrar registrar_;
56  NotificationObserver* observer_;
57
58  DISALLOW_COPY_AND_ASSIGN(PrefSetObserver);
59};
60
61#endif  // CHROME_BROWSER_PREFS_PREF_SET_OBSERVER_H_
62