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Telegram/lib_ui/ui/inactive_press.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 "ui/inactive_press.h"
+
+#include "base/timer.h"
+#include "base/qt_connection.h"
+
+#include <QtCore/QPointer>
+
+namespace Ui {
+namespace {
+
+constexpr auto kInactivePressTimeout = crl::time(200);
+
+struct InactivePressedWidget {
+	QWidget *widget = nullptr;
+	base::qt_connection connection;
+	base::Timer timer;
+};
+
+std::unique_ptr<InactivePressedWidget> Tracker;
+
+} // namespace
+
+void MarkInactivePress(not_null<QWidget*> widget, bool was) {
+	if (!was) {
+		if (WasInactivePress(widget)) {
+			Tracker = nullptr;
+		}
+		return;
+	}
+
+	Tracker = std::make_unique<InactivePressedWidget>();
+	Tracker->widget = widget;
+	Tracker->connection = QObject::connect(widget, &QWidget::destroyed, [=] {
+		Tracker->connection.release();
+		Tracker = nullptr;
+	});
+	Tracker->timer.setCallback([=] {
+		Tracker = nullptr;
+	});
+	Tracker->timer.callOnce(kInactivePressTimeout);
+}
+
+[[nodiscard]] bool WasInactivePress(not_null<QWidget*> widget) {
+	return Tracker && (Tracker->widget == widget);
+}
+
+} // namespace Ui