system_settings_provider.cc revision 4e180b6a0b4720a9b8e9e959a882386f690f08ff 
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#include "content/public/browser/render_view_host.h"
14#include "content/public/browser/render_widget_host.h"
15#include "content/public/browser/render_widget_host_iterator.h"
16
17namespace chromeos {
18
19SystemSettingsProvider::SystemSettingsProvider(
20    const NotifyObserversCallback& notify_cb)
21    : CrosSettingsProvider(notify_cb) {
22  system::TimezoneSettings *timezone_settings =
23      system::TimezoneSettings::GetInstance();
24  timezone_settings->AddObserver(this);
25  timezone_value_.reset(new base::StringValue(
26      timezone_settings->GetCurrentTimezoneID()));
27}
28
29SystemSettingsProvider::~SystemSettingsProvider() {
30  system::TimezoneSettings::GetInstance()->RemoveObserver(this);
31}
32
33void SystemSettingsProvider::DoSet(const std::string& path,
34                                   const base::Value& in_value) {
35  // Non-guest users can change the time zone.
36  if (!LoginState::Get()->IsUserAuthenticated())
37    return;
38
39  if (path == kSystemTimezone) {
40    string16 timezone_id;
41    if (!in_value.GetAsString(&timezone_id))
42      return;
43    // This will call TimezoneChanged.
44    system::TimezoneSettings::GetInstance()->SetTimezoneFromID(timezone_id);
45  }
46}
47
48const base::Value* SystemSettingsProvider::Get(const std::string& path) const {
49  if (path == kSystemTimezone)
50    return timezone_value_.get();
51  return NULL;
52}
53
54// The timezone is always trusted.
55CrosSettingsProvider::TrustedStatus
56    SystemSettingsProvider::PrepareTrustedValues(const base::Closure& cb) {
57  return TRUSTED;
58}
59
60bool SystemSettingsProvider::HandlesSetting(const std::string& path) const {
61  return path == kSystemTimezone;
62}
63
64void SystemSettingsProvider::TimezoneChanged(const icu::TimeZone& timezone) {
65  // Fires system setting change notification.
66  timezone_value_.reset(new base::StringValue(
67      system::TimezoneSettings::GetTimezoneID(timezone)));
68  NotifyObservers(kSystemTimezone);
69
70  // Notify renderers
71  scoped_ptr<content::RenderWidgetHostIterator> widgets(
72      content::RenderWidgetHost::GetRenderWidgetHosts());
73  while (content::RenderWidgetHost* widget = widgets->GetNextHost()) {
74    if (widget->IsRenderView()) {
75      content::RenderViewHost* view = content::RenderViewHost::From(widget);
76      view->NotifyTimezoneChange();
77    }
78  }
79}
80
81}  // namespace chromeos
82