Index: chrome/browser/chromeos/policy/recommendation_restorer.cc |
diff --git a/chrome/browser/chromeos/policy/recommendation_restorer.cc b/chrome/browser/chromeos/policy/recommendation_restorer.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..4f47983e9e019e84106335c03e5e9095b6ae30a5 |
--- /dev/null |
+++ b/chrome/browser/chromeos/policy/recommendation_restorer.cc |
@@ -0,0 +1,144 @@ |
+// Copyright (c) 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.h" |
+#include "base/values.h" |
+#include "chrome/browser/chromeos/profiles/profile_helper.h" |
+#include "chrome/browser/profiles/profile.h" |
+#include "chrome/common/chrome_notification_types.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() { |
+ 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) |
+ 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 |