学步园

Class Wizard Example中是讲的线性结构的向导，License Wizard Example是复杂结构向导的一个简单例子。

例子由下面两部分组成：

1. LicenseWizard，它继承自QWizard，实现了一个非线性结构的5页向导。向导指导用户通过选择许可协议的程序。

2. IntroPage，EvaluatePage，RegisterPage，DetailsPage和ConclusionPage，他们都是QWizardPage的子类，实现一个向导页。

这个例子有许多明显的问题，不过不要认真，你认真就输了 ^ ^

本例中使用重新实现nextId()来指定下一页，从而改变线性的向导结构。使用setPage(id, page)的方式添加向导页则为之设置了id。setStartId则设置开始页。

另外setOption(WizardOption option, bool on = true) 来设置一些选项，例如可增加帮助按钮：setOption(HaveHelpButton, true);

WizardOption有许多枚举值项，可查帮助文档。

那么开始看代码吧~

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

    QApplication app(argc, argv);

    // 国际化支持
    QString translatorFileName = QLatin1String("qt_");
    translatorFileName += QLocale::system().name();  // 返回语言和国家"language_country"
    QTranslator *translator = new QTranslator(&app);
    if (translator->load(translatorFileName, QLibraryInfo::location(QLibraryInfo::TranslationsPath)))
        app.installTranslator(translator);
    
    LicenseWizard wizard;
    wizard.show();
    return app.exec();
}

//! [0] //! [1]
// LicenseWizard需要通过ID来调用页的先后顺序，则为页都提供一个枚举值
class LicenseWizard : public QWizard
{
//! [0]
    Q_OBJECT

public:
//! [2]
    enum { Page_Intro, Page_Evaluate, Page_Register, Page_Details,
           Page_Conclusion };  // 定义一个枚举类作为标识
//! [2]

    LicenseWizard(QWidget *parent = 0);

private slots:
    void showHelp();    // 自定义个一个槽，用以弹出帮助说明
//! [3]
};
//! [1] //! [3]

//! [4]
// IntroPage页，一个topLabel显示说明，两个RadioButton指导下一步走向
// 需要重新实现nextId()
class IntroPage : public QWizardPage
{
    Q_OBJECT

public:
    IntroPage(QWidget *parent = 0);

    int nextId() const;

private:
    QLabel *topLabel;
    QRadioButton *registerRadioButton;
    QRadioButton *evaluateRadioButton;
};
//! [4]

//! [5]
// Evaluate页，包含两对label两对lineEdit
class EvaluatePage : public QWizardPage
{
    Q_OBJECT

public:
    EvaluatePage(QWidget *parent = 0);

    int nextId() const;

private:
    QLabel *nameLabel;
    QLabel *emailLabel;
    QLineEdit *nameLineEdit;
    QLineEdit *emailLineEdit;
};
//! [5]
// 验证Key页面
class RegisterPage : public QWizardPage
{
    Q_OBJECT

public:
    RegisterPage(QWidget *parent = 0);

    int nextId() const;

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

// Details页，三对label-lineEdit
class DetailsPage : public QWizardPage
{
    Q_OBJECT

public:
    DetailsPage(QWidget *parent = 0);

    int nextId() const;

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

//! [6]
// 最后一页提供打印协议
// 重新实现setVisible，让打印按钮动态创建
class ConclusionPage : public QWizardPage
{
    Q_OBJECT

public:
    ConclusionPage(QWidget *parent = 0);

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

private slots:
    void printButtonClicked();

private:
    QLabel *bottomLabel;
    QCheckBox *agreeCheckBox;
};
//! [6]

//! [0] //! [1] //! [2]
LicenseWizard::LicenseWizard(QWidget *parent)
    : QWizard(parent)
{
//! [0]
    // 依次添加5页，枚举值与向导页实例对应
    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);
//! [1]
    // 设置开始页
    setStartId(Page_Intro);  // Page_Intro为枚举值
//! [2]

//! [3]
#ifndef Q_WS_MAC
//! [3] //! [4]
    setWizardStyle(ModernStyle);
#endif
//! [4] //! [5]
    setOption(HaveHelpButton, true);
//! [5] //! [6]
    setPixmap(QWizard::LogoPixmap, QPixmap(":/images/logo.png"));

//! [7]
    connect(this, SIGNAL(helpRequested()), this, SLOT(showHelp()));
//! [7]

    setWindowTitle(tr("License Wizard"));
//! [8]
}
//! [6] //! [8]

//! [9] //! [10]
void LicenseWizard::showHelp()
//! [9] //! [11]
{
    static QString lastHelpMessage;  // 静态变量为全局服务

    QString message;

    switch (currentId()) {  // 为不同的页提供不同的帮助信息
    case Page_Intro:
        message = tr("The decision you make here will affect which page you "
                     "get to see next.");
        break;
//! [10] //! [11]
    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;
//! [12] //! [13]
    default:
        message = tr("This help is likely not to be of any help.");
    }
//! [12]

    if (lastHelpMessage == message)  // 同一页面点击帮助偶数次
        message = tr("Sorry, I already gave what help I could. "
                     "Maybe you should try asking a human?");

//! [14]
    // 弹出信息对话框
    QMessageBox::information(this, tr("License Wizard Help"), message);
//! [14]

    lastHelpMessage = message;
//! [15]
}
//! [13] //! [15]

//! [16]
IntroPage::IntroPage(QWidget *parent)
    : QWizardPage(parent)
{
    setTitle(tr("Introduction"));  // 页标题
    setPixmap(QWizard::WatermarkPixmap, QPixmap(":/images/watermark.png")); // 页左侧图片

    // 顶部提示信息
    topLabel = new QLabel(tr("This wizard will help you register your copy of "
                             "<i>Super Product One</i>™ or start "
                             "evaluating the product."));
    topLabel->setWordWrap(true);    // 防止单行显示

    // 单选按钮组
    registerRadioButton = new QRadioButton(tr("&Register your copy"));
    evaluateRadioButton = new QRadioButton(tr("&Evaluate the product for 30 "
                                              "days"));
    registerRadioButton->setChecked(true);  // 初始化为第一个选中

    QVBoxLayout *layout = new QVBoxLayout;  // 布局
    layout->addWidget(topLabel);
    layout->addWidget(registerRadioButton);
    layout->addWidget(evaluateRadioButton);
    setLayout(layout);
}
//! [16] //! [17]

//! [18]
// 指示下一页ID
int IntroPage::nextId() const
//! [17] //! [19]
{
    if (evaluateRadioButton->isChecked()) {  // 根据单选按钮选中下一页
        return LicenseWizard::Page_Evaluate;
    } else {
        return LicenseWizard::Page_Register;
    }
}
//! [18] //! [19]

//! [20]
EvaluatePage::EvaluatePage(QWidget *parent)
    : QWizardPage(parent)
{
    setTitle(tr("Evaluate <i>Super Product One</i>™"));
    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:"));       // 创建页内的窗体部件
    nameLineEdit = new QLineEdit;
//! [20]
    nameLabel->setBuddy(nameLineEdit);  //label和lineEdit绑定

    emailLabel = new QLabel(tr("&Email address:"));
    emailLineEdit = new QLineEdit;
    // 用正则表达式指定需带@符号，用QRegExpValidator检查输入字符是否符合要求
    emailLineEdit->setValidator(new QRegExpValidator(QRegExp(".*@.*"), this));
    emailLabel->setBuddy(emailLineEdit);

//! [21]
    registerField("evaluate.name*", nameLineEdit);      // 两个lineEdit都注册成托管域
    registerField("evaluate.email*", emailLineEdit);    // 只有将本页的托管域都填好了才能进入下一页
//! [21]

    QGridLayout *layout = new QGridLayout;  // 布局
    layout->addWidget(nameLabel, 0, 0);
    layout->addWidget(nameLineEdit, 0, 1);
    layout->addWidget(emailLabel, 1, 0);
    layout->addWidget(emailLineEdit, 1, 1);
    setLayout(layout);
//! [22]
}
//! [22]

//! [23]
int EvaluatePage::nextId() const
{
    return LicenseWizard::Page_Conclusion;  // 指示下一页
}
//! [23]
// 验证Key
RegisterPage::RegisterPage(QWidget *parent)
    : QWizardPage(parent)
{
    setTitle(tr("Register Your Copy of <i>Super Product One</i>™"));
    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);

    // 设置域
    registerField("register.name*", nameLineEdit);      // 将注册名作为托管域
    registerField("register.upgradeKey", upgradeKeyLineEdit);

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

//! [24]
int RegisterPage::nextId() const
{
    if (upgradeKeyLineEdit->text().isEmpty()) {  // 简单判断key来确定下一页
        return LicenseWizard::Page_Details;
    } else {
        return LicenseWizard::Page_Conclusion;
    }
}
//! [24]

DetailsPage::DetailsPage(QWidget *parent)
    : QWizardPage(parent)
{
    // 标题与子标题
    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)."));

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

    emailLabel = new QLabel(tr("&Email address:"));
    emailLineEdit = new QLineEdit;
    emailLineEdit->setValidator(new QRegExpValidator(QRegExp(".*@.*"), this));  // 格式过滤
    emailLabel->setBuddy(emailLineEdit);

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

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

    QGridLayout *layout = new QGridLayout;  // 布局
    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);
}

//! [25]
int DetailsPage::nextId() const
{
    return LicenseWizard::Page_Conclusion;  // 指示下一页为conclusion页
}
//! [25]

ConclusionPage::ConclusionPage(QWidget *parent)
    : QWizardPage(parent)
{
    // 设置标题与左侧图片
    setTitle(tr("Complete Your Registration"));
    setPixmap(QWizard::WatermarkPixmap, QPixmap(":/images/watermark.png"));

    bottomLabel = new QLabel;    // 一个说明标签
    bottomLabel->setWordWrap(true);

    // checkBox指示是否同意协议，同意了才能让你点击完成
    agreeCheckBox = new QCheckBox(tr("I agree to the terms of the license"));

    registerField("conclusion.agree*", agreeCheckBox);  // 注册域

    QVBoxLayout *layout = new QVBoxLayout;  // 竖直布局
    layout->addWidget(bottomLabel);
    layout->addWidget(agreeCheckBox);
    setLayout(layout);
}

//! [26]
int ConclusionPage::nextId() const   // 没有下一页了
{
    return -1;
}
//! [26]

//! [27]
// ConclusionPage前一页点击Next后调用本槽
void ConclusionPage::initializePage()   //
{
    QString licenseText;

    // 根据上一页的不同ID来决定说明标签里的内容
    //wizard()返回与本页相关联的向导; hasVisitedPage（id）是否访问id页
    if (wizard()->hasVisitedPage(LicenseWizard::Page_Evaluate)) { // 如果来自EvaluatePage
        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)) { // 如果来自EetailsPage
        licenseText = tr("<u>First-Time License Agreement:</u> "
                         "You can use this software subject to the license "
                         "you will receive by email.");
    } else {                                                   // 如果来自RegisterPage
        licenseText = tr("<u>Upgrade License Agreement:</u> "
                         "This software is licensed under the terms of your "
                         "current license.");
    }
    bottomLabel->setText(licenseText);
}
//! [27]

//! [28]
// 设置打印按钮
void ConclusionPage::setVisible(bool visible)
{
    QWizardPage::setVisible(visible);

    if (visible) {  // 可见，就创建Print按钮
//! [29]
        wizard()->setButtonText(QWizard::CustomButton1, tr("&Print"));
        wizard()->setOption(QWizard::HaveCustomButton1, true);  // 设置第一个自定义按钮
        connect(wizard(), SIGNAL(customButtonClicked(int)),  // 连接信号槽
                this, SLOT(printButtonClicked()));
//! [29]
    } else {
        wizard()->setOption(QWizard::HaveCustomButton1, false);
        disconnect(wizard(), SIGNAL(customButtonClicked(int)),  // 隐藏则断开连接
                   this, SLOT(printButtonClicked()));
    }
}
//! [28]

void ConclusionPage::printButtonClicked()  // 打印License
{
    QPrinter printer;
    QPrintDialog dialog(&printer, this);
    if (dialog.exec())   // 以弹出对话框代替打印
        QMessageBox::warning(this, tr("Print License"),
                             tr("As an environmentally friendly measure, the "
                                "license text will not actually be printed."));
}