| // 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. |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_BATTERY_BATTERY_STATUS_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_MODULES_BATTERY_BATTERY_STATUS_H_ |
| |
| #include "base/time/time.h" |
| #include "third_party/blink/renderer/modules/modules_export.h" |
| #include "third_party/blink/renderer/platform/wtf/allocator/allocator.h" |
| |
| #include <cmath> |
| #include <limits> |
| |
| namespace blink { |
| |
| // Simple struct to hold the battery status. This class is copyable. |
| class MODULES_EXPORT BatteryStatus final { |
| DISALLOW_NEW(); |
| |
| public: |
| BatteryStatus() |
| : charging_(true), discharging_time_(base::TimeDelta::Max()), level_(1) {} |
| BatteryStatus(bool charging, |
| base::TimeDelta charging_time, |
| base::TimeDelta discharging_time, |
| double level) |
| : charging_(charging), |
| charging_time_(charging_time), |
| discharging_time_(discharging_time), |
| level_(EnsureTwoSignificantDigits(level)) {} |
| BatteryStatus(const BatteryStatus&) = default; |
| BatteryStatus& operator=(const BatteryStatus&) = default; |
| |
| bool Charging() const { return charging_; } |
| base::TimeDelta charging_time() const { return charging_time_; } |
| base::TimeDelta discharging_time() const { return discharging_time_; } |
| double Level() const { return level_; } |
| |
| private: |
| double EnsureTwoSignificantDigits(double level) { |
| // Convert battery level value which should be in [0, 1] to a value in |
| // [0, 1] with 2 digits of precision. This is to provide a consistent |
| // experience across platforms (e.g. on Mac and Android the battery changes |
| // are generally reported with 1% granularity). It also serves the purpose |
| // of reducing the possibility of fingerprinting and triggers less level |
| // change events on platforms where the granularity is high. |
| DCHECK(level >= 0 && level <= 1); |
| return std::round(level * 100) / 100.f; |
| } |
| |
| bool charging_; |
| base::TimeDelta charging_time_; |
| base::TimeDelta discharging_time_; |
| double level_; |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_MODULES_BATTERY_BATTERY_STATUS_H_ |