chrome/browser/chromeos/policy/recommendation_restorer.h

   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/base/user_activity/user_activity_observer.h"
  18
  19 class Profile;
  20
  21 namespace 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.
  29 class RecommendationRestorer : public KeyedService,
  30                                public content::NotificationObserver,
  31                                public ui::UserActivityObserver {
  32  public:
  33   explicit RecommendationRestorer(Profile* profile);
  34   ~RecommendationRestorer() override;
  35
  36   // KeyedService:
  37   void Shutdown() override;
  38
  39   // content::NotificationObserver:
  40   void Observe(int type,
  41                const content::NotificationSource& source,
  42                const content::NotificationDetails& details) override;
  43
  44   // ui::UserActivityObserver:
  45   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_