qt 6.5.1 original

tests/manual/wasm/eventloop/thread_exec/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+qt_internal_add_manual_test(thread_exec
+    GUI
+    SOURCES
+        main.cpp
+    LIBRARIES
+        Qt::Core
+        Qt::Gui
+)

tests/manual/wasm/eventloop/thread_exec/main.cpp

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+// Copyright (C) 2021 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+#include <QtGui>
+
+class EventTarget : public QObject
+{
+    Q_OBJECT
+protected:
+    bool event(QEvent *evt)
+    {
+        if (evt->type() == QEvent::User) {
+            qDebug() << "User event on thread" << QThread::currentThread();
+            return true;
+        }
+        return QObject::event(evt);
+    }
+};
+
+class EventPosterWindow: public QRasterWindow
+{
+public:
+    EventPosterWindow(EventTarget *target)
+        :m_target(target)
+        { }
+
+    void paintEvent(QPaintEvent *ev) override {
+        QPainter p(this);
+        p.fillRect(ev->rect(), QColorConstants::Svg::deepskyblue);
+        p.drawText(50, 100, "Application has started. Click to post events.\n See the developer tools console for debug output");
+    }
+
+    void mousePressEvent(QMouseEvent *) override {
+        qDebug() << "Posting events from thread" << QThread::currentThread();
+        QGuiApplication::postEvent(m_target, new QEvent(QEvent::User));
+        QTimer::singleShot(500, m_target, []() {
+            qDebug() << "Timer event on secondary thread" << QThread::currentThread();
+        });
+    }
+
+public:
+    EventTarget *m_target;
+};
+
+class SecondaryThread : public QThread
+{
+public:
+    void run() override {
+        qDebug() << "exec on secondary thread" << QThread::currentThread();
+        exec();
+    }
+};
+
+// This example demonstrates how to start a secondary thread event loop
+int main(int argc, char **argv)
+{
+    QGuiApplication app(argc, argv);
+
+    EventTarget eventTarget;
+
+    EventPosterWindow window(&eventTarget);
+    window.show();
+
+    SecondaryThread thread;
+    eventTarget.moveToThread(&thread);
+
+#if QT_CONFIG(thread)
+    thread.start();
+#else
+    qDebug() << "Warning: This test requires a multithreaded build of Qt for WebAssembly";
+#endif
+
+    return app.exec();
+}
+
+#include "main.moc"