main.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
#include <QtWidgets>
 
class Widget : public QWidget
{
public:
    Widget(QWidget *parent = nullptr);
};
 
Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    QWidget *firstPageWidget = new QWidget;
    QWidget *secondPageWidget = new QWidget;
    QWidget *thirdPageWidget = new QWidget;
 
    QStackedWidget *stackedWidget = new QStackedWidget;
    stackedWidget->addWidget(firstPageWidget);
    stackedWidget->addWidget(secondPageWidget);
    stackedWidget->addWidget(thirdPageWidget);
 
    QComboBox *pageComboBox = new QComboBox;
    pageComboBox->addItem(tr("Page 1"));
    pageComboBox->addItem(tr("Page 2"));
    pageComboBox->addItem(tr("Page 3"));
    connect(pageComboBox, &QComboBox::activated,
            stackedWidget, &QStackedWidget::setCurrentIndex);
 
    QVBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(pageComboBox);
    layout->addWidget(stackedWidget);
    setLayout(layout);
}
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    Widget widget;
    widget.show();
    return app.exec();
}