qtdeclarative/examples/quick/quickwidgets/quickwidget/main.cpp

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#include <QQuickWidget>
#include <QQmlError>
#include <QtWidgets>

class MainWindow : public QMainWindow {
    Q_OBJECT
public:
    MainWindow();

private slots:
    void quickWidgetStatusChanged(QQuickWidget::Status);
    void sceneGraphError(QQuickWindow::SceneGraphError error, const QString &message);
    void grabToFile();
    void renderToFile();

private:
    QQuickWidget *m_quickWidget;
};

MainWindow::MainWindow()
   : m_quickWidget(new QQuickWidget)
{
    QSurfaceFormat format;
    if (QCoreApplication::arguments().contains(QStringLiteral("--coreprofile"))) {
        format.setVersion(4, 4);
        format.setProfile(QSurfaceFormat::CoreProfile);
    }
    if (QCoreApplication::arguments().contains(QStringLiteral("--multisample")))
        format.setSamples(4);
    m_quickWidget->setFormat(format);

    QMdiArea *centralWidget = new QMdiArea;

    QLCDNumber *lcd = new QLCDNumber;
    lcd->display(1337);
    lcd->setMinimumSize(250,100);
    centralWidget ->addSubWindow(lcd);

    QUrl source("qrc:quickwidget/rotatingsquare.qml");

    connect(m_quickWidget, &QQuickWidget::statusChanged,
            this, &MainWindow::quickWidgetStatusChanged);
    connect(m_quickWidget, &QQuickWidget::sceneGraphError,
            this, &MainWindow::sceneGraphError);
    m_quickWidget->resize(300,300);
    m_quickWidget->setResizeMode(QQuickWidget::SizeRootObjectToView );
    m_quickWidget->setSource(source);

    centralWidget ->addSubWindow(m_quickWidget);

    setCentralWidget(centralWidget);

    QMenu *fileMenu = menuBar()->addMenu(tr("&File"));
    fileMenu->addAction(tr("Grab to imFage"), this, &MainWindow::grabToFile);
    fileMenu->addAction(tr("Render to pixmap"), this, &MainWindow::renderToFile);
    fileMenu->addAction(tr("Quit"), qApp, &QCoreApplication::quit);
}

void MainWindow::quickWidgetStatusChanged(QQuickWidget::Status status)
{
    if (status == QQuickWidget::Error) {
        QStringList errors;
        foreach (const QQmlError &error, m_quickWidget->errors())
            errors.append(error.toString());
        statusBar()->showMessage(errors.join(QStringLiteral(", ")));
    }
}

void MainWindow::sceneGraphError(QQuickWindow::SceneGraphError, const QString &message)
{
     statusBar()->showMessage(message);
}

template<class T> void saveToFile(QWidget *parent, T *saveable)
{
    QString t;
    QFileDialog fd(parent, t, QString());
    fd.setAcceptMode(QFileDialog::AcceptSave);
    fd.setDefaultSuffix("png");
    fd.selectFile("test.png");
    if (fd.exec() == QDialog::Accepted)
        saveable->save(fd.selectedFiles().first());
}

void MainWindow::grabToFile()
{
    QImage image = m_quickWidget->grabFramebuffer();
    saveToFile(this, &image);
}

void MainWindow::renderToFile()
{
    QPixmap pixmap(m_quickWidget->size());
    m_quickWidget->render(&pixmap);
    saveToFile(this, &pixmap);
}

int main(int argc, char **argv)
{
    QApplication app(argc, argv);

    MainWindow mainWindow;
    mainWindow.show();

    return app.exec();
}

#include "main.moc"