system_settings_provider.cc revision 2a99a7e74a7f215066514fe81d2bfa6639d9eddd 
1// Copyright (c) 2012 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#include "chrome/browser/chromeos/settings/system_settings_provider.h"
6
7#include "base/string16.h"
8#include "base/time.h"
9#include "base/values.h"
10#include "chrome/browser/chromeos/login/user_manager.h"
11#include "chrome/browser/chromeos/settings/cros_settings.h"
12#include "chrome/browser/chromeos/settings/cros_settings_names.h"
13#include "grit/generated_resources.h"
14#include "ui/base/l10n/l10n_util.h"
15
16namespace chromeos {
17
18SystemSettingsProvider::SystemSettingsProvider(
19    const NotifyObserversCallback& notify_cb)
20    : CrosSettingsProvider(notify_cb) {
21  system::TimezoneSettings *timezone_settings =
22      system::TimezoneSettings::GetInstance();
23  timezone_settings->AddObserver(this);
24  timezone_value_.reset(new base::StringValue(
25      timezone_settings->GetCurrentTimezoneID()));
26}
27
28SystemSettingsProvider::~SystemSettingsProvider() {
29  system::TimezoneSettings::GetInstance()->RemoveObserver(this);
30}
31
32void SystemSettingsProvider::DoSet(const std::string& path,
33                                   const base::Value& in_value) {
34  // Non-guest users can change the time zone.
35  if (UserManager::Get()->IsLoggedInAsGuest())
36    return;
37
38  if (path == kSystemTimezone) {
39    string16 timezone_id;
40    if (!in_value.GetAsString(&timezone_id))
41      return;
42    // This will call TimezoneChanged.
43    system::TimezoneSettings::GetInstance()->SetTimezoneFromID(timezone_id);
44  }
45}
46
47const base::Value* SystemSettingsProvider::Get(const std::string& path) const {
48  if (path == kSystemTimezone)
49    return timezone_value_.get();
50  return NULL;
51}
52
53// The timezone is always trusted.
54CrosSettingsProvider::TrustedStatus
55    SystemSettingsProvider::PrepareTrustedValues(const base::Closure& cb) {
56  return TRUSTED;
57}
58
59bool SystemSettingsProvider::HandlesSetting(const std::string& path) const {
60  return path == kSystemTimezone;
61}
62
63void SystemSettingsProvider::TimezoneChanged(const icu::TimeZone& timezone) {
64  // Fires system setting change notification.
65  timezone_value_.reset(new base::StringValue(
66      system::TimezoneSettings::GetTimezoneID(timezone)));
67  NotifyObservers(kSystemTimezone);
68}
69
70}  // namespace chromeos
71