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++ // Copyright (C) 2016 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #include <QApplication>
++ #include <QLabel>
++ #include <QPropertyAnimation>
++ #include <QSequentialAnimationGroup>
++ #include "tracer.h"
++
++ int main(int argc, char *argv[])
++ {
++ QApplication app(argc, argv);
++
++ QWidget window;
++ window.resize(720, 96);
++ window.show();
++
++ QLabel *label1 = new QLabel(&window);
++ label1->setPixmap(QPixmap(":/icons/left.png"));
++ label1->move(16, 16);
++ label1->show();
++
++ QLabel *label2 = new QLabel(&window);
++ label2->setPixmap(QPixmap(":/icons/right.png"));
++ label2->move(320, 16);
++ label2->show();
++
++ QPropertyAnimation *anim1 = new QPropertyAnimation(label1, "pos");
++ anim1->setDuration(2500);
++ anim1->setStartValue(QPoint(16, 16));
++ anim1->setEndValue(QPoint(320, 16));
++
++ QPropertyAnimation *anim2 = new QPropertyAnimation(label2, "pos");
++ anim2->setDuration(2500);
++ anim2->setStartValue(QPoint(320, 16));
++ anim2->setEndValue(QPoint(640, 16));
++
++ QSequentialAnimationGroup group;
++ group.addAnimation(anim1);
++ group.addAnimation(anim2);
++
++ Tracer tracer(&window);
++
++ QObject::connect(anim1, SIGNAL(valueChanged(QVariant)),
++ &tracer, SLOT(recordValue(QVariant)));
++ QObject::connect(anim2, SIGNAL(valueChanged(QVariant)),
++ &tracer, SLOT(recordValue(QVariant)));
++ QObject::connect(anim1, SIGNAL(finished()), &tracer, SLOT(checkValue()));
++ QObject::connect(anim2, SIGNAL(finished()), &tracer, SLOT(checkValue()));
++
++ group.start();
++ return app.exec();
++ }