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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"
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