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      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 
     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 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