recommendation_restorer.h revision c5cede9ae108bb15f6b7a8aea21c7e1fefa2834c 
1// Copyright 2013 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_CHROMEOS_POLICY_RECOMMENDATION_RESTORER_H_
6#define CHROME_BROWSER_CHROMEOS_POLICY_RECOMMENDATION_RESTORER_H_
7
8#include <string>
9
10#include "base/basictypes.h"
11#include "base/compiler_specific.h"
12#include "base/prefs/pref_change_registrar.h"
13#include "base/timer/timer.h"
14#include "components/keyed_service/core/keyed_service.h"
15#include "content/public/browser/notification_observer.h"
16#include "content/public/browser/notification_registrar.h"
17#include "ui/wm/core/user_activity_observer.h"
18
19class Profile;
20
21namespace policy {
22
23// Observes a set of prefs in the login profile. If any of the prefs has a
24// recommended value, its user setting is cleared so that the recommendation can
25// take effect. This happens immediately when the login screen is shown, when
26// a session is being started and whenever recommended values change during a
27// user session. On the login screen, user settings are cleared when the user
28// becomes idle for one minute.
29class RecommendationRestorer : public KeyedService,
30                               public content::NotificationObserver,
31                               public wm::UserActivityObserver {
32 public:
33  explicit RecommendationRestorer(Profile* profile);
34  virtual ~RecommendationRestorer();
35
36  // KeyedService:
37  virtual void Shutdown() OVERRIDE;
38
39  // content::NotificationObserver:
40  virtual void Observe(int type,
41                       const content::NotificationSource& source,
42                       const content::NotificationDetails& details) OVERRIDE;
43
44  // wm::UserActivityObserver:
45  virtual void OnUserActivity(const ui::Event* event) OVERRIDE;
46
47  // If a recommended value and a user setting exist for |pref_name|, clears the
48  // user setting so that the recommended value can take effect. If
49  // |allow_delay| is |true| and the login screen is being shown, a timer is
50  // started that will clear the setting when the user becomes idle for one
51  // minute. Otherwise, the setting is cleared immediately.
52  void Restore(bool allow_delay, const std::string& pref_name);
53
54 private:
55  friend class RecommendationRestorerTest;
56
57  void RestoreAll();
58
59  void StartTimer();
60  void StopTimer();
61
62  PrefChangeRegistrar pref_change_registrar_;
63  content::NotificationRegistrar notification_registrar_;
64
65  bool logged_in_;
66
67  base::OneShotTimer<RecommendationRestorer> restore_timer_;
68
69  DISALLOW_COPY_AND_ASSIGN(RecommendationRestorer);
70};
71
72}  // namespace policy
73
74#endif  // CHROME_BROWSER_CHROMEOS_POLICY_RECOMMENDATION_RESTORER_H_
75