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// 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 "device/battery/battery_status_manager_win.h"
#include "base/bind.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/metrics/histogram.h"
#include "base/strings/string16.h"
#include "base/win/message_window.h"
#include "base/win/windows_version.h"
#include "device/battery/battery_status_manager.h"
namespace device {
namespace {
typedef BatteryStatusService::BatteryUpdateCallback BatteryCallback;
const wchar_t kWindowClassName[] = L"BatteryStatusMessageWindow";
// This enum is used for histogram. Don't change the order of the existing
// values.
enum NumberBatteriesType {
UNKNOWN_BATTERIES = 0,
NO_BATTERY = 1,
ONE_OR_MORE_BATTERIES = 2,
BATTERY_TYPES_COUNT = 3,
};
void UpdateNumberBatteriesHistogram(NumberBatteriesType count) {
UMA_HISTOGRAM_ENUMERATION("BatteryStatus.NumberBatteriesWin",
count,
BATTERY_TYPES_COUNT);
}
void UpdateNumberBatteriesHistogram() {
SYSTEM_POWER_STATUS win_status;
if (!GetSystemPowerStatus(&win_status)) {
UpdateNumberBatteriesHistogram(UNKNOWN_BATTERIES);
return;
}
if (win_status.BatteryFlag == 255)
UpdateNumberBatteriesHistogram(UNKNOWN_BATTERIES);
else if (win_status.BatteryFlag == 128)
UpdateNumberBatteriesHistogram(NO_BATTERY);
else
UpdateNumberBatteriesHistogram(ONE_OR_MORE_BATTERIES);
}
// Message-only window for handling battery changes on Windows.
class BatteryStatusObserver {
public:
explicit BatteryStatusObserver(const BatteryCallback& callback)
: power_handle_(NULL),
battery_change_handle_(NULL),
callback_(callback) {
}
~BatteryStatusObserver() { DCHECK(!window_); }
void Start() {
if (CreateMessageWindow()) {
BatteryChanged();
// RegisterPowerSettingNotification function work from Windows Vista
// onwards. However even without them we will receive notifications,
// e.g. when a power source is connected.
// TODO(timvolodine) : consider polling for battery changes on windows
// versions prior to Vista, see crbug.com/402466.
power_handle_ =
RegisterNotification(&GUID_ACDC_POWER_SOURCE);
battery_change_handle_ =
RegisterNotification(&GUID_BATTERY_PERCENTAGE_REMAINING);
} else {
// Could not create a message window, execute callback with the default
// values.
callback_.Run(BatteryStatus());
}
UpdateNumberBatteriesHistogram();
}
void Stop() {
if (power_handle_) {
UnregisterNotification(power_handle_);
power_handle_ = NULL;
}
if (battery_change_handle_) {
UnregisterNotification(battery_change_handle_);
battery_change_handle_ = NULL;
}
window_.reset();
}
private:
void BatteryChanged() {
SYSTEM_POWER_STATUS win_status;
if (GetSystemPowerStatus(&win_status))
callback_.Run(ComputeWebBatteryStatus(win_status));
else
callback_.Run(BatteryStatus());
}
bool HandleMessage(UINT message,
WPARAM wparam,
LPARAM lparam,
LRESULT* result) {
switch(message) {
case WM_POWERBROADCAST:
if (wparam == PBT_APMPOWERSTATUSCHANGE ||
wparam == PBT_POWERSETTINGCHANGE) {
BatteryChanged();
}
*result = NULL;
return true;
default:
return false;
}
}
HPOWERNOTIFY RegisterNotification(LPCGUID power_setting) {
if (base::win::GetVersion() < base::win::VERSION_VISTA)
return NULL;
return RegisterPowerSettingNotification(window_->hwnd(), power_setting,
DEVICE_NOTIFY_WINDOW_HANDLE);
}
BOOL UnregisterNotification(HPOWERNOTIFY handle) {
if (base::win::GetVersion() < base::win::VERSION_VISTA)
return FALSE;
return UnregisterPowerSettingNotification(handle);
}
bool CreateMessageWindow() {
// TODO(timvolodine): consider reusing the message window of PowerMonitor.
window_.reset(new base::win::MessageWindow());
if (!window_->CreateNamed(base::Bind(&BatteryStatusObserver::HandleMessage,
base::Unretained(this)),
base::string16(kWindowClassName))) {
LOG(ERROR) << "Failed to create message window: " << kWindowClassName;
window_.reset();
return false;
}
return true;
}
HPOWERNOTIFY power_handle_;
HPOWERNOTIFY battery_change_handle_;
BatteryCallback callback_;
scoped_ptr<base::win::MessageWindow> window_;
DISALLOW_COPY_AND_ASSIGN(BatteryStatusObserver);
};
class BatteryStatusManagerWin : public BatteryStatusManager {
public:
explicit BatteryStatusManagerWin(const BatteryCallback& callback)
: battery_observer_(new BatteryStatusObserver(callback)) {}
~BatteryStatusManagerWin() override { battery_observer_->Stop(); }
public:
// BatteryStatusManager:
bool StartListeningBatteryChange() override {
battery_observer_->Start();
return true;
}
void StopListeningBatteryChange() override { battery_observer_->Stop(); }
private:
scoped_ptr<BatteryStatusObserver> battery_observer_;
DISALLOW_COPY_AND_ASSIGN(BatteryStatusManagerWin);
};
} // namespace
BatteryStatus ComputeWebBatteryStatus(const SYSTEM_POWER_STATUS& win_status) {
BatteryStatus status;
status.charging = win_status.ACLineStatus != WIN_AC_LINE_STATUS_OFFLINE;
// Set level if available. Otherwise keep the default value which is 1.
if (win_status.BatteryLifePercent != 255) {
// Convert percentage to a value between 0 and 1 with 2 significant digits.
status.level = static_cast<double>(win_status.BatteryLifePercent) / 100.;
}
if (!status.charging) {
// Set discharging_time if available otherwise keep the default value,
// which is +Infinity.
if (win_status.BatteryLifeTime != (DWORD)-1)
status.discharging_time = win_status.BatteryLifeTime;
status.charging_time = std::numeric_limits<double>::infinity();
} else {
// Set charging_time to +Infinity if not fully charged, otherwise leave the
// default value, which is 0.
if (status.level < 1)
status.charging_time = std::numeric_limits<double>::infinity();
}
return status;
}
// static
scoped_ptr<BatteryStatusManager> BatteryStatusManager::Create(
const BatteryStatusService::BatteryUpdateCallback& callback) {
return scoped_ptr<BatteryStatusManager>(
new BatteryStatusManagerWin(callback));
}
} // namespace device
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