【Qt之QWizard】使用2，示例分析

效果图

在这里插入图片描述
根据首页的选择不同，进入不同的选项。

以下是代码。

示例

`.h`

#ifndef LICENSEWIZARD_H
#define LICENSEWIZARD_H

#include <QWizard>

QT_BEGIN_NAMESPACE
class QCheckBox;
class QLabel;
class QLineEdit;
class QRadioButton;
QT_END_NAMESPACE


class LicenseWizard : public QWizard
{
    Q_OBJECT

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

    LicenseWizard(QWidget *parent = 0);

private slots:
    void showHelp();
};

class IntroPage : public QWizardPage
{
    Q_OBJECT

public:
    IntroPage(QWidget *parent = 0);

    int nextId() const override;

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

class EvaluatePage : public QWizardPage
{
    Q_OBJECT

public:
    EvaluatePage(QWidget *parent = 0);

    int nextId() const override;

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

class RegisterPage : public QWizardPage
{
    Q_OBJECT

public:
    RegisterPage(QWidget *parent = 0);

    int nextId() const override;

private:
    QLabel *nameLabel;
    QLabel *upgradeKeyLabel;
    QLineEdit *nameLineEdit;
    QLineEdit *upgradeKeyLineEdit;
};

class DetailsPage : public QWizardPage
{
    Q_OBJECT

public:
    DetailsPage(QWidget *parent = 0);

    int nextId() const override;

private:
    QLabel *companyLabel;
    QLabel *emailLabel;
    QLabel *postalLabel;
    QLineEdit *companyLineEdit;
    QLineEdit *emailLineEdit;
    QLineEdit *postalLineEdit;
};

class ConclusionPage : public QWizardPage
{
    Q_OBJECT

public:
    ConclusionPage(QWidget *parent = 0);

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

private slots:
    void printButtonClicked();

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

#endif

`.h`分析

这是一个使用Qt框架实现的向导（Wizard）应用程序的头文件。这个应用程序利用QWizard类创建了一个包含多个页面的向导，以便用户能够有步骤地完成某些任务。这个应用程序包含以下几个类：

LicenseWizard：一个继承自QWizard的类，表示整个向导应用程序。它包含了多个页面，如IntroPage、EvaluatePage、RegisterPage、DetailsPage和ConclusionPage。
IntroPage：向导的第一页，包含一个标题、两个单选钮（一个表示注册，另一个表示试用）和一个“帮助”按钮。
EvaluatePage：向导的第二页，用于试用授权。包含两个标签和两个文本框（用于输入用户姓名和电子邮件）。
RegisterPage：向导的第三页，用于注册授权。包含两个标签和两个文本框（用于输入用户姓名和注册密钥）。
DetailsPage：向导的第四页，用于输入用户详细信息。包含三个标签和三个文本框（用于输入公司名称、电子邮件和邮政编码）。
ConclusionPage：向导的最后一页，显示一条消息和一个复选框（用于表示用户同意某些条款）。包含一个“打印”按钮以及相关的槽函数，用于处理用户单击该按钮的事件。

`.cpp`

#include <QtWidgets>
#if defined(QT_PRINTSUPPORT_LIB)
#include <QtPrintSupport/qtprintsupportglobal.h>
#if QT_CONFIG(printdialog)
#include <QPrinter>
#include <QPrintDialog>
#endif
#endif

#include "licensewizard.h"

QString emailRegExp = QStringLiteral(".+@.+");

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_MAC
    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;
    case Page_Evaluate:
        message = tr("Make sure to provide a valid email address, such as "
                     "toni.buddenbrook@example.de.");
        break;
    case Page_Register:
        message = tr("If you don't provide an upgrade key, you will be "
                     "asked to fill in your details.");
        break;
    case Page_Details:
        message = tr("Make sure to provide a valid email address, such as "
                     "thomas.gradgrind@example.co.uk.");
        break;
    case Page_Conclusion:
        message = tr("You must accept the terms and conditions of the "
                     "license to proceed.");
        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;
}

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;
    }
}

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;
    nameLabel->setBuddy(nameLineEdit);

    emailLabel = new QLabel(tr("&Email address:"));
    emailLineEdit = new QLineEdit;
    emailLineEdit->setValidator(new QRegularExpressionValidator(QRegularExpression(emailRegExp), this));
    emailLabel->setBuddy(emailLineEdit);

    registerField("evaluate.name*", nameLineEdit);
    registerField("evaluate.email*", emailLineEdit);

    QGridLayout *layout = new QGridLayout;
    layout->addWidget(nameLabel, 0, 0);
    layout->addWidget(nameLineEdit, 0, 1);
    layout->addWidget(emailLabel, 1, 0);
    layout->addWidget(emailLineEdit, 1, 1);
    setLayout(layout);
}

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

RegisterPage::RegisterPage(QWidget *parent)
    : QWizardPage(parent)
{
    setTitle(tr("Register Your Copy of <i>Super Product One</i>&trade;"));
    setSubTitle(tr("If you have an upgrade key, please fill in "
                   "the appropriate field."));

    nameLabel = new QLabel(tr("N&ame:"));
    nameLineEdit = new QLineEdit;
    nameLabel->setBuddy(nameLineEdit);

    upgradeKeyLabel = new QLabel(tr("&Upgrade key:"));
    upgradeKeyLineEdit = new QLineEdit;
    upgradeKeyLabel->setBuddy(upgradeKeyLineEdit);

    registerField("register.name*", nameLineEdit);
    registerField("register.upgradeKey", upgradeKeyLineEdit);

    QGridLayout *layout = new QGridLayout;
    layout->addWidget(nameLabel, 0, 0);
    layout->addWidget(nameLineEdit, 0, 1);
    layout->addWidget(upgradeKeyLabel, 1, 0);
    layout->addWidget(upgradeKeyLineEdit, 1, 1);
    setLayout(layout);
}

int RegisterPage::nextId() const
{
    if (upgradeKeyLineEdit->text().isEmpty()) {
        return LicenseWizard::Page_Details;
    } else {
        return LicenseWizard::Page_Conclusion;
    }
}

DetailsPage::DetailsPage(QWidget *parent)
    : QWizardPage(parent)
{
    setTitle(tr("Fill In Your Details"));
    setSubTitle(tr("Please fill all three fields. Make sure to provide a valid "
                   "email address (e.g., tanaka.aya@example.co.jp)."));

    companyLabel = new QLabel(tr("&Company name:"));
    companyLineEdit = new QLineEdit;
    companyLabel->setBuddy(companyLineEdit);

    emailLabel = new QLabel(tr("&Email address:"));
    emailLineEdit = new QLineEdit;
    emailLineEdit->setValidator(new QRegularExpressionValidator(QRegularExpression(emailRegExp), this));
    emailLabel->setBuddy(emailLineEdit);

    postalLabel = new QLabel(tr("&Postal address:"));
    postalLineEdit = new QLineEdit;
    postalLabel->setBuddy(postalLineEdit);

    registerField("details.company*", companyLineEdit);
    registerField("details.email*", emailLineEdit);
    registerField("details.postal*", postalLineEdit);

    QGridLayout *layout = new QGridLayout;
    layout->addWidget(companyLabel, 0, 0);
    layout->addWidget(companyLineEdit, 0, 1);
    layout->addWidget(emailLabel, 1, 0);
    layout->addWidget(emailLineEdit, 1, 1);
    layout->addWidget(postalLabel, 2, 0);
    layout->addWidget(postalLineEdit, 2, 1);
    setLayout(layout);
}


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

ConclusionPage::ConclusionPage(QWidget *parent)
    : QWizardPage(parent)
{
    setTitle(tr("Complete Your Registration"));
    setPixmap(QWizard::WatermarkPixmap, QPixmap(":/images/watermark.png"));

    bottomLabel = new QLabel;
    bottomLabel->setWordWrap(true);

    agreeCheckBox = new QCheckBox(tr("I agree to the terms of the license"));

    registerField("conclusion.agree*", agreeCheckBox);

    QVBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(bottomLabel);
    layout->addWidget(agreeCheckBox);
    setLayout(layout);
}

int ConclusionPage::nextId() const
{
    return -1;
}

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)) {
        licenseText = tr("<u>First-Time License Agreement:</u> "
                         "You can use this software subject to the license "
                         "you will receive by email.");
    } 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);
    }
}

void ConclusionPage::printButtonClicked()
{
#if QT_CONFIG(printdialog)
    QPrinter printer;
    QPrintDialog dialog(&printer, this);
    if (dialog.exec())
        QMessageBox::warning(this, tr("Print License"),
                             tr("As an environmentally friendly measure, the "
                                "license text will not actually be printed."));
#endif
}

`.cpp`分析

cpp用于实现

`.main`

#include <QApplication>
#include <QTranslator>
#include <QLocale>
#include <QLibraryInfo>

#include "licensewizard.h"

int main(int argc, char *argv[])
{
    Q_INIT_RESOURCE(licensewizard);

    QApplication app(argc, argv);

#ifndef QT_NO_TRANSLATION
    QString translatorFileName = QLatin1String("qt_");
    translatorFileName += QLocale::system().name();
    QTranslator *translator = new QTranslator(&app);
    if (translator->load(translatorFileName, QLibraryInfo::location(QLibraryInfo::TranslationsPath)))
        app.installTranslator(translator);
#endif

    LicenseWizard wizard;
    wizard.show();
    return app.exec();
}

`.main`分析

#ifndef QT_NO_TRANSLATION
    QString translatorFileName = QLatin1String("qt_");
    translatorFileName += QLocale::system().name();
    QTranslator *translator = new QTranslator(&app);
    if (translator->load(translatorFileName, QLibraryInfo::location(QLibraryInfo::TranslationsPath)))
        app.installTranslator(translator);
#endif

这段代码是一个条件编译指令，用于根据Qt框架是否已启用本地化支持来加载Qt翻译文件，以实现多语言支持。具体实现如下：

如果Qt框架没有启用本地化支持，则直接跳过这段代码，不做任何操作。
如果Qt框架已启用本地化支持，则根据当前系统语言名称生成对应的Qt翻译文件名，并尝试加载该文件。加载成功后，将翻译文件安装到应用程序中，从而使应用程序在当前语言环境下显示正确的翻译文本。

其中，QLatin1String是一个Qt框架提供的用于创建一个不可修改的QString对象的宏。此外，QLocale::system().name()用于获取当前系统的语言名称。最后，QLibraryInfo::location(QLibraryInfo::TranslationsPath)用于获取Qt框架的翻译文件路径。