services/device/time_zone_monitor/time_zone_monitor_win.cc

// Copyright 2014 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 "services/device/time_zone_monitor/time_zone_monitor.h"

#include <windows.h>

#include <memory>

#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/macros.h"
#include "base/trace_event/trace_event.h"
#include "third_party/icu/source/i18n/unicode/timezone.h"
#include "ui/gfx/win/singleton_hwnd_observer.h"

namespace device {

class TimeZoneMonitorWin : public TimeZoneMonitor {
 public:
  TimeZoneMonitorWin()
      : TimeZoneMonitor(),
        singleton_hwnd_observer_(new gfx::SingletonHwndObserver(
            base::BindRepeating(&TimeZoneMonitorWin::OnWndProc,
                                base::Unretained(this)))) {}

  ~TimeZoneMonitorWin() override {}

 private:
  void OnWndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam) {
    if (message != WM_TIMECHANGE) {
      return;
    }
    TRACE_EVENT0("browser", "TimeZoneMonitorWin::UpdateIcuAndNotifyClients");
    UpdateIcuAndNotifyClients(DetectHostTimeZoneFromIcu());
  }

  std::unique_ptr<gfx::SingletonHwndObserver> singleton_hwnd_observer_;

  DISALLOW_COPY_AND_ASSIGN(TimeZoneMonitorWin);
};

// static
std::unique_ptr<TimeZoneMonitor> TimeZoneMonitor::Create(
    scoped_refptr<base::SequencedTaskRunner> file_task_runner) {
  return std::unique_ptr<TimeZoneMonitor>(new TimeZoneMonitorWin());
}

}  // namespace device