ライセンスウィザードの例

class LicenseWizard : public QWizard
{
    Q_OBJECT

public:
    enum { Page_Intro, Page_Evaluate, Page_Register, Page_Details,
           Page_Conclusion };

    LicenseWizard(QWidget *parent = nullptr);

private slots:
    void showHelp();
};

LicenseWizard::LicenseWizard(QWidget *parent)
    : QWizard(parent)
{
    setPage(Page_Intro, new IntroPage);
    setPage(Page_Evaluate, new EvaluatePage);
    setPage(Page_Register, new RegisterPage);
    setPage(Page_Details, new DetailsPage);
    setPage(Page_Conclusion, new ConclusionPage);

    setStartId(Page_Intro);

#ifndef Q_OS_MACOS
    setWizardStyle(ModernStyle);
#endif

    setOption(HaveHelpButton, true);
    setPixmap(QWizard::LogoPixmap, QPixmap(":/images/logo.png"));

    connect(this, &QWizard::helpRequested, this, &LicenseWizard::showHelp);

    setWindowTitle(tr("License Wizard"));
}

void LicenseWizard::showHelp()
{
    static QString lastHelpMessage;

    QString message;

    switch (currentId()) {
    case Page_Intro:
        message = tr("The decision you make here will affect which page you "
                     "get to see next.");
        break;
    ...
    default:
        message = tr("This help is likely not to be of any help.");
    }

    if (lastHelpMessage == message)
        message = tr("Sorry, I already gave what help I could. "
                     "Maybe you should try asking a human?");

    QMessageBox::information(this, tr("License Wizard Help"), message);

    lastHelpMessage = message;
}

class IntroPage : public QWizardPage
{
    Q_OBJECT

public:
    IntroPage(QWidget *parent = nullptr);

    int nextId() const override;

private:
    QLabel *topLabel;
    QRadioButton *registerRadioButton;
    QRadioButton *evaluateRadioButton;
};

IntroPage::IntroPage(QWidget *parent)
    : QWizardPage(parent)
{
    setTitle(tr("Introduction"));
    setPixmap(QWizard::WatermarkPixmap, QPixmap(":/images/watermark.png"));

    topLabel = new QLabel(tr("This wizard will help you register your copy of "
                             "<i>Super Product One</i>&trade; or start "
                             "evaluating the product."));
    topLabel->setWordWrap(true);

    registerRadioButton = new QRadioButton(tr("&Register your copy"));
    evaluateRadioButton = new QRadioButton(tr("&Evaluate the product for 30 "
                                              "days"));
    registerRadioButton->setChecked(true);

    QVBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(topLabel);
    layout->addWidget(registerRadioButton);
    layout->addWidget(evaluateRadioButton);
    setLayout(layout);
}

int IntroPage::nextId() const
{
    if (evaluateRadioButton->isChecked()) {
        return LicenseWizard::Page_Evaluate;
    } else {
        return LicenseWizard::Page_Register;
    }
}

class EvaluatePage : public QWizardPage
{
    Q_OBJECT

public:
    EvaluatePage(QWidget *parent = nullptr);

    int nextId() const override;

private:
    QLabel *nameLabel;
    QLabel *emailLabel;
    QLineEdit *nameLineEdit;
    QLineEdit *emailLineEdit;
};

EvaluatePage::EvaluatePage(QWidget *parent)
    : QWizardPage(parent)
{
    setTitle(tr("Evaluate <i>Super Product One</i>&trade;"));
    setSubTitle(tr("Please fill both fields. Make sure to provide a valid "
                   "email address (e.g., john.smith@example.com)."));

    nameLabel = new QLabel(tr("N&ame:"));
    nameLineEdit = new QLineEdit;
    ...
    registerField("evaluate.name*", nameLineEdit);
    registerField("evaluate.email*", emailLineEdit);
    ...
}

int EvaluatePage::nextId() const
{
    return LicenseWizard::Page_Conclusion;
}

class ConclusionPage : public QWizardPage
{
    Q_OBJECT

public:
    ConclusionPage(QWidget *parent = nullptr);

    void initializePage() override;
    int nextId() const override;
    void setVisible(bool visible) override;

private slots:
    void printButtonClicked();

private:
    QLabel *bottomLabel;
    QCheckBox *agreeCheckBox;
};

int IntroPage::nextId() const
{
    if (evaluateRadioButton->isChecked()) {
        return LicenseWizard::Page_Evaluate;
    } else {
        return LicenseWizard::Page_Register;
    }
}

void ConclusionPage::initializePage()
{
    QString licenseText;

    if (wizard()->hasVisitedPage(LicenseWizard::Page_Evaluate)) {
        licenseText = tr("<u>Evaluation License Agreement:</u> "
                         "You can use this software for 30 days and make one "
                         "backup, but you are not allowed to distribute it.");
    } else if (wizard()->hasVisitedPage(LicenseWizard::Page_Details)) {
        const QString emailAddress = field("details.email").toString();
        licenseText = tr("<u>First-Time License Agreement:</u> "
                         "You can use this software subject to the license "
                         "you will receive by email sent to %1.").arg(emailAddress);
    } else {
        licenseText = tr("<u>Upgrade License Agreement:</u> "
                         "This software is licensed under the terms of your "
                         "current license.");
    }
    bottomLabel->setText(licenseText);
}

void ConclusionPage::setVisible(bool visible)
{
    QWizardPage::setVisible(visible);

    if (visible) {
        wizard()->setButtonText(QWizard::CustomButton1, tr("&Print"));
        wizard()->setOption(QWizard::HaveCustomButton1, true);
        connect(wizard(), &QWizard::customButtonClicked,
                this, &ConclusionPage::printButtonClicked);
    } else {
        wizard()->setOption(QWizard::HaveCustomButton1, false);
        disconnect(wizard(), &QWizard::customButtonClicked,
                   this, &ConclusionPage::printButtonClicked);
    }
}