chrome/browser/chromeos/settings/system_settings_provider.cc

   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
  17 namespace chromeos {
  18
  19 SystemSettingsProvider::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
  29 SystemSettingsProvider::~SystemSettingsProvider() {
  30   system::TimezoneSettings::GetInstance()->RemoveObserver(this);
  31 }
  32
  33 void 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     base::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
  48 const 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.
  55 CrosSettingsProvider::TrustedStatus
  56     SystemSettingsProvider::PrepareTrustedValues(const base::Closure& cb) {
  57   return TRUSTED;
  58 }
  59
  60 bool SystemSettingsProvider::HandlesSetting(const std::string& path) const {
  61   return path == kSystemTimezone;
  62 }
  63
  64 void 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