system_settings_provider.cc revision 5c02ac1a9c1b504631c0a3d2b6e737b5d738bae1 
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/strings/string16.h"
8#include "base/time/time.h"
9#include "base/values.h"
10#include "chromeos/login/login_state.h"
11#include "chromeos/settings/cros_settings_names.h"
12#include "content/public/browser/render_process_host.h"
13
14namespace chromeos {
15
16SystemSettingsProvider::SystemSettingsProvider(
17    const NotifyObserversCallback& notify_cb)
18    : CrosSettingsProvider(notify_cb) {
19  system::TimezoneSettings *timezone_settings =
20      system::TimezoneSettings::GetInstance();
21  timezone_settings->AddObserver(this);
22  timezone_value_.reset(new base::StringValue(
23      timezone_settings->GetCurrentTimezoneID()));
24}
25
26SystemSettingsProvider::~SystemSettingsProvider() {
27  system::TimezoneSettings::GetInstance()->RemoveObserver(this);
28}
29
30void SystemSettingsProvider::DoSet(const std::string& path,
31                                   const base::Value& in_value) {
32  // Non-guest users can change the time zone.
33  if (LoginState::Get()->IsGuestUser())
34    return;
35
36  if (path == kSystemTimezone) {
37    base::string16 timezone_id;
38    if (!in_value.GetAsString(&timezone_id))
39      return;
40    // This will call TimezoneChanged.
41    system::TimezoneSettings::GetInstance()->SetTimezoneFromID(timezone_id);
42  }
43}
44
45const base::Value* SystemSettingsProvider::Get(const std::string& path) const {
46  if (path == kSystemTimezone)
47    return timezone_value_.get();
48  return NULL;
49}
50
51// The timezone is always trusted.
52CrosSettingsProvider::TrustedStatus
53    SystemSettingsProvider::PrepareTrustedValues(const base::Closure& cb) {
54  return TRUSTED;
55}
56
57bool SystemSettingsProvider::HandlesSetting(const std::string& path) const {
58  return path == kSystemTimezone;
59}
60
61void SystemSettingsProvider::TimezoneChanged(const icu::TimeZone& timezone) {
62  // Fires system setting change notification.
63  timezone_value_.reset(new base::StringValue(
64      system::TimezoneSettings::GetTimezoneID(timezone)));
65  NotifyObservers(kSystemTimezone);
66}
67
68}  // namespace chromeos
69