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Telegram/lib_base/base/power_save_blocker.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
+
+#include <QtCore/QPointer>
+
+class QWindow;
+
+namespace base {
+
+enum class PowerSaveBlockType {
+	PreventAppSuspension,
+	PreventDisplaySleep,
+
+	kCount,
+};
+
+class PowerSaveBlocker final {
+public:
+	PowerSaveBlocker(
+		PowerSaveBlockType type,
+		const QString &description,
+		QWindow *window);
+	~PowerSaveBlocker();
+
+	[[nodiscard]] PowerSaveBlockType type() const {
+		return _type;
+	}
+	[[nodiscard]] const QString &description() const {
+		return _description;
+	}
+	[[nodiscard]] QPointer<QWindow> window() const;
+
+private:
+	const PowerSaveBlockType _type = {};
+	const QString _description;
+	const QPointer<QWindow> _window;
+
+};
+
+// DescriptionResolver -> QString, WindowResolver -> QPointer<QWindow>.
+template <typename DescriptionResolver, typename WindowResolver>
+void UpdatePowerSaveBlocker(
+		std::unique_ptr<PowerSaveBlocker> &blocker,
+		bool block,
+		PowerSaveBlockType type,
+		DescriptionResolver &&description,
+		WindowResolver &&window) {
+	if (block && !blocker) {
+		blocker = std::make_unique<PowerSaveBlocker>(
+			type,
+			description(),
+			window());
+	} else if (!block && blocker) {
+		blocker = nullptr;
+	}
+}
+
+} // namespace base