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// 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.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
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