| // Copyright 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "chrome/browser/chromeos/policy/recommendation_restorer.h" |
| |
| #include "ash/shell.h" |
| #include "ash/wm/user_activity_detector.h" |
| #include "base/bind.h" |
| #include "base/bind_helpers.h" |
| #include "base/location.h" |
| #include "base/logging.h" |
| #include "base/prefs/pref_service.h" |
| #include "base/time/time.h" |
| #include "base/values.h" |
| #include "chrome/browser/chrome_notification_types.h" |
| #include "chrome/browser/chromeos/profiles/profile_helper.h" |
| #include "chrome/browser/profiles/profile.h" |
| #include "chrome/common/pref_names.h" |
| #include "content/public/browser/notification_details.h" |
| #include "content/public/browser/notification_service.h" |
| #include "content/public/browser/notification_source.h" |
| |
| namespace policy { |
| |
| namespace { |
| // The amount of idle time after which recommended values are restored. |
| const int kRestoreDelayInMs = 60 * 1000; // 1 minute. |
| } // namespace |
| |
| RecommendationRestorer::RecommendationRestorer(Profile* profile) |
| : logged_in_(false) { |
| if (!chromeos::ProfileHelper::IsSigninProfile(profile)) |
| return; |
| |
| pref_change_registrar_.Init(profile->GetPrefs()); |
| pref_change_registrar_.Add(prefs::kLargeCursorEnabled, |
| base::Bind(&RecommendationRestorer::Restore, |
| base::Unretained(this), true)); |
| pref_change_registrar_.Add(prefs::kSpokenFeedbackEnabled, |
| base::Bind(&RecommendationRestorer::Restore, |
| base::Unretained(this), true)); |
| pref_change_registrar_.Add(prefs::kHighContrastEnabled, |
| base::Bind(&RecommendationRestorer::Restore, |
| base::Unretained(this), true)); |
| pref_change_registrar_.Add(prefs::kScreenMagnifierEnabled, |
| base::Bind(&RecommendationRestorer::Restore, |
| base::Unretained(this), true)); |
| pref_change_registrar_.Add(prefs::kScreenMagnifierType, |
| base::Bind(&RecommendationRestorer::Restore, |
| base::Unretained(this), true)); |
| |
| notification_registrar_.Add(this, chrome::NOTIFICATION_LOGIN_USER_CHANGED, |
| content::NotificationService::AllSources()); |
| |
| RestoreAll(); |
| } |
| |
| RecommendationRestorer::~RecommendationRestorer() { |
| } |
| |
| void RecommendationRestorer::Shutdown() { |
| StopTimer(); |
| pref_change_registrar_.RemoveAll(); |
| notification_registrar_.RemoveAll(); |
| } |
| |
| void RecommendationRestorer::Observe( |
| int type, |
| const content::NotificationSource& source, |
| const content::NotificationDetails& details) { |
| if (type == chrome::NOTIFICATION_LOGIN_USER_CHANGED) { |
| logged_in_ = true; |
| notification_registrar_.RemoveAll(); |
| StopTimer(); |
| RestoreAll(); |
| } else { |
| NOTREACHED(); |
| } |
| } |
| |
| void RecommendationRestorer::OnUserActivity(const ui::Event* event) { |
| if (restore_timer_.IsRunning()) |
| restore_timer_.Reset(); |
| } |
| |
| void RecommendationRestorer::Restore(bool allow_delay, |
| const std::string& pref_name) { |
| const PrefService::Preference* pref = |
| pref_change_registrar_.prefs()->FindPreference(pref_name.c_str()); |
| if (!pref) { |
| NOTREACHED(); |
| return; |
| } |
| |
| if (!pref->GetRecommendedValue() || !pref->HasUserSetting()) |
| return; |
| |
| if (logged_in_) { |
| allow_delay = false; |
| } else if (allow_delay && ash::Shell::HasInstance()) { |
| // Skip the delay if there has been no user input since the browser started. |
| const ash::UserActivityDetector* user_activity_detector = |
| ash::Shell::GetInstance()->user_activity_detector(); |
| allow_delay = !user_activity_detector->last_activity_time().is_null(); |
| } |
| |
| if (allow_delay) |
| StartTimer(); |
| else |
| pref_change_registrar_.prefs()->ClearPref(pref->name().c_str()); |
| } |
| |
| void RecommendationRestorer::RestoreAll() { |
| Restore(false, prefs::kLargeCursorEnabled); |
| Restore(false, prefs::kSpokenFeedbackEnabled); |
| Restore(false, prefs::kHighContrastEnabled); |
| Restore(false, prefs::kScreenMagnifierEnabled); |
| Restore(false, prefs::kScreenMagnifierType); |
| } |
| |
| void RecommendationRestorer::StartTimer() { |
| // Listen for user activity so that the timer can be reset while the user is |
| // active, causing it to fire only when the user remains idle for |
| // |kRestoreDelayInMs|. |
| if (ash::Shell::HasInstance()) { |
| ash::UserActivityDetector* user_activity_detector = |
| ash::Shell::GetInstance()->user_activity_detector(); |
| if (!user_activity_detector->HasObserver(this)) |
| user_activity_detector->AddObserver(this); |
| } |
| |
| // There should be a separate timer for each pref. However, in the common |
| // case of the user changing settings, a single timer is sufficient. This is |
| // because a change initiated by the user implies user activity, so that even |
| // if there was a separate timer per pref, they would all be reset at that |
| // point, causing them to fire at exactly the same time. In the much rarer |
| // case of a recommended value changing, a single timer is a close |
| // approximation of the behavior that would be obtained by resetting the timer |
| // for the affected pref only. |
| restore_timer_.Start(FROM_HERE, |
| base::TimeDelta::FromMilliseconds(kRestoreDelayInMs), |
| base::Bind(&RecommendationRestorer::RestoreAll, |
| base::Unretained(this))); |
| } |
| |
| void RecommendationRestorer::StopTimer() { |
| restore_timer_.Stop(); |
| if (ash::Shell::HasInstance()) |
| ash::Shell::GetInstance()->user_activity_detector()->RemoveObserver(this); |
| } |
| |
| } // namespace policy |