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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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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