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Telegram/lib_base/base/battery_saving.h

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+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#pragma once
+
+namespace base::Platform {
+
+class AbstractBatterySaving {
+public:
+	virtual ~AbstractBatterySaving() = default;
+
+	virtual std::optional<bool> enabled() const = 0;
+};
+
+[[nodiscard]] std::unique_ptr<AbstractBatterySaving> CreateBatterySaving(
+	Fn<void()> changeCallback);
+
+} // namespace base::Platform
+
+namespace base {
+
+class BatterySaving final {
+public:
+	BatterySaving();
+	~BatterySaving();
+
+	[[nodiscard]] bool supported() const {
+		return enabled().has_value();
+	}
+	[[nodiscard]] std::optional<bool> enabled() const;
+	[[nodiscard]] rpl::producer<bool> value() const;
+
+private:
+	const std::unique_ptr<Platform::AbstractBatterySaving> _helper;
+
+	rpl::variable<std::optional<bool>> _value;
+
+};
+
+} // namespace base