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Telegram/lib_base/base/last_user_input.cpp

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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
+//
+#include "base/last_user_input.h"
+
+#include "base/event_filter.h"
+#include "base/platform/base_platform_last_input.h"
+
+#include <QtCore/QCoreApplication>
+
+namespace base {
+
+crl::time LastUserInputTime() {
+	Expects(QCoreApplication::instance() != nullptr);
+
+	if (const auto specific = base::Platform::LastUserInputTime()) {
+		return *specific;
+	}
+	static auto result = crl::time(0);
+	static const auto isInputEvent = [](not_null<QEvent*> e) {
+		switch (e->type()) {
+		case QEvent::MouseMove:
+		case QEvent::KeyPress:
+		case QEvent::MouseButtonPress:
+		case QEvent::TouchBegin:
+		case QEvent::Wheel: return true;
+		}
+		return false;
+	};
+	static const auto updateResult = [](not_null<QEvent*> e) {
+		if (isInputEvent(e)) {
+			result = crl::now();
+		}
+		return base::EventFilterResult::Continue;
+	};
+	[[maybe_unused]] static const auto watcher = base::install_event_filter(
+		QCoreApplication::instance(),
+		updateResult);
+	return result;
+}
+
+crl::time SinceLastUserInput() {
+	return crl::now() - LastUserInputTime();
+}
+
+} // namespace base