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Telegram/lib_base/base/call_delayed.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/call_delayed.h"
+
+#include "base/timer.h"
+
+#include <QtCore/QCoreApplication>
+
+namespace base {
+namespace {
+
+DelayedCallTimer *GlobalTimer = nullptr;
+bool Finished = false;
+
+void CreateGlobalTimer() {
+	Expects(QCoreApplication::instance() != nullptr);
+	Expects(!GlobalTimer);
+
+	const auto instance = QCoreApplication::instance();
+	Assert(instance != nullptr);
+
+	GlobalTimer = new DelayedCallTimer();
+	instance->connect(instance, &QCoreApplication::aboutToQuit, [] {
+		Finished = true;
+	});
+	instance->connect(instance, &QCoreApplication::destroyed, [] {
+		Finished = true;
+		delete GlobalTimer;
+		GlobalTimer = nullptr;
+	});
+}
+
+} // namespace
+
+void call_delayed(crl::time delay, FnMut<void()> &&callable) {
+	if (Finished) {
+		return;
+	}
+	if (!GlobalTimer) {
+		CreateGlobalTimer();
+	}
+	GlobalTimer->call(delay, std::move(callable));
+}
+
+} // namespace base