| // Copyright 2019 The Chromium OS 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 POWER_MANAGER_COMMON_BATTERY_PERCENTAGE_CONVERTER_H_ |
| #define POWER_MANAGER_COMMON_BATTERY_PERCENTAGE_CONVERTER_H_ |
| |
| #include <memory> |
| |
| #include <base/macros.h> |
| |
| namespace power_manager { |
| |
| class PrefsInterface; |
| |
| // Converts actual battery percentage to display battery percentage and vice |
| // versa. |
| class BatteryPercentageConverter { |
| public: |
| static std::unique_ptr<BatteryPercentageConverter> CreateFromPrefs( |
| PrefsInterface* prefs); |
| |
| BatteryPercentageConverter(double low_battery_shutdown_percent, |
| double full_factor); |
| ~BatteryPercentageConverter(); |
| |
| // Converts actual battery percentage to the battery percentage which will be |
| // displayed to the user. Returns value in the range [0.0, 100.0]. |
| double ConvertActualToDisplay(double actual_percentage) const; |
| |
| // Converts displayed battery percentage to the actual battery percentage. |
| // Returns value in the range [0.0, 100.0]. |
| double ConvertDisplayToActual(double display_percentage) const; |
| |
| private: |
| // Remaining battery percentage at which the system will shut down |
| // automatically. 0.0 if unset. Initialized from |
| // |kLowBatteryShutdownPercentPref|. |
| const double low_battery_shutdown_percent_ = 0.0; |
| |
| // The fraction of the full charge at which the battery is considered full, |
| // in the range (0.0, 1.0]. Initialized from |kPowerSupplyFullFactorPref|. |
| const double full_factor_ = 1.0; |
| |
| DISALLOW_COPY_AND_ASSIGN(BatteryPercentageConverter); |
| }; |
| |
| } // namespace power_manager |
| |
| #endif // POWER_MANAGER_COMMON_BATTERY_PERCENTAGE_CONVERTER_H_ |