【Qt之QWizardPage】使用

介绍

QWizardPage类是向导页面的基类。
QWizard表示一个向导。每个页面都是一个QWizardPage。当创建自己的向导时，可以直接使用QWizardPage，也可以子类化它以获得更多控制。
页面具有以下属性，由QWizard呈现：a title，a subTitle和a set of pixmaps。有关详细信息，请参见向导页面元素。一旦将页面添加到向导中（使用QWizard :: addPage（）或QWizard :: setPage（）），wizard（）将返回指向相关的QWizard对象的指针。
页面提供了五个虚函数，可以重新实现以提供自定义行为：

• initializePage（）在用户单击向导的“下一步”按钮时调用以初始化页面的内容。如果您想从先前页面输入的内容中派生页面的默认值，则应该重新实现此函数。
• cleanupPage（）在用户单击向导的“返回”按钮时调用以重置页面的内容。
• validatePage（）在用户单击Next或Finish时验证页面。如果用户输入了不完整或无效的信息，通常会使用此函数显示错误消息。
• nextId（）返回下一页的ID。它在创建非线性向导时很有用，这些向导允许基于用户提供的信息进行不同的遍历路径。
• isComplete（）用于确定是否应启用或禁用“下一步”和/或“完成”按钮。如果重新实现isComplete（），还必须确保每当完成状态更改时发出completeChanged（）。

通常，向导的“下一步”按钮和“完成”按钮是互斥的。如果isFinalPage（）返回true，则可用Finish；否则，可用下一步。默认情况下，isFinalPage（）仅在nextId（）返回-1时为true。如果要在页面上同时显示“下一步”和“完成”（允许用户执行“早期完成”），请在该页面上调用setFinalPage（true）。对于支持早期完成的向导，您可能还想在向导上设置HaveNextButtonOnLastPage和HaveFinishButtonOnEarlyPages选项。

在许多向导中，页面的内容可能会影响后续页面的字段的默认值。为了方便页面之间的通信，QWizard支持“字段”机制，允许您在页面上注册字段（例如QLineEdit）并从任何页面访问其值。字段对整个向导程序是全局的，并使任何单个页面都可以访问存储在另一个页面中的信息，而无需将所有逻辑放入QWizard或页面明确知道彼此。使用registerField（）注册字段，可以使用field（）和setField（）随时访问它们。

常用方法

1. virtual void initializePage(int id)
   这个虚函数由QWizard::initializePage()调用，以便在页面显示之前对其进行准备，或者由于QWizard::restart()被调用，或者由于用户单击Next而显示页面。(但是，如果设置了QWizard::IndependentPages选项，则仅在第一次显示页面时调用此函数。)
   通过重新实现这个函数，您可以确保页面的字段是基于先前页面中的字段正确初始化的。例如:

void OutputFilesPage: initializePage ()
｛QString className = field("className").toString();headerLineEdit->setText(className.toLower() + ".h");implementationLineEdit->setText(className.toLower() + ".cpp");outputDirLineEdit - > setText (QDir:: toNativeSeparators (QDir: tempPath ()));
}

默认实现什么都不做。
2. void setButtonText(QWizard::WizardButton which, const QString &text)
将按钮上的文本设置为本页上的文本。
默认情况下，按钮上的文本依赖于QWizard::wizardStyle，但可以使用QWizard::setButtonText()为整个向导重新定义。

setButtonText(QWizard::NextButton, "hei");

3. void setCommitPage(bool commitPage)
如果commitPage为true，则将该页设置为提交页;否则，将其设置为普通页面。
提交页是表示不能通过单击“返回”或“取消”来撤消的操作的页面。
提交按钮取代提交页面上的Next按钮。单击此按钮只调用QWizard::next()，就像单击next一样。
直接从提交页面进入的页面会禁用后退按钮。

setCommitPage(true);

4. void setFinalPage(bool finalPage)
   如果finalPage为true，则显式地将此页面设置为final。
   调用setFinalPage(true)后，isFinalPage()返回true, Finish按钮可见(如果isComplete()返回true则启用)。
   调用setFinalPage(false)后，如果nextId()返回-1,isFinalPage()返回true;否则，返回false。

示例

.h

#ifndef CLASSWIZARD_H
#define CLASSWIZARD_H#include <QWizard>QT_BEGIN_NAMESPACE
class QCheckBox;
class QGroupBox;
class QLabel;
class QLineEdit;
class QRadioButton;
QT_END_NAMESPACEclass ClassWizard : public QWizard
{Q_OBJECTpublic:ClassWizard(QWidget *parent = 0);void accept() override;
};class IntroPage : public QWizardPage
{Q_OBJECTpublic:IntroPage(QWidget *parent = 0);private:QLabel *label;
};class ClassInfoPage : public QWizardPage
{Q_OBJECTpublic:ClassInfoPage(QWidget *parent = 0);private:QLabel *classNameLabel;QLabel *baseClassLabel;QLineEdit *classNameLineEdit;QLineEdit *baseClassLineEdit;QCheckBox *qobjectMacroCheckBox;QGroupBox *groupBox;QRadioButton *qobjectCtorRadioButton;QRadioButton *qwidgetCtorRadioButton;QRadioButton *defaultCtorRadioButton;QCheckBox *copyCtorCheckBox;
};class CodeStylePage : public QWizardPage
{Q_OBJECTpublic:CodeStylePage(QWidget *parent = 0);protected:void initializePage() override;private:QCheckBox *commentCheckBox;QCheckBox *protectCheckBox;QCheckBox *includeBaseCheckBox;QLabel *macroNameLabel;QLabel *baseIncludeLabel;QLineEdit *macroNameLineEdit;QLineEdit *baseIncludeLineEdit;
};class OutputFilesPage : public QWizardPage
{Q_OBJECTpublic:OutputFilesPage(QWidget *parent = 0);protected:void initializePage() override;private:QLabel *outputDirLabel;QLabel *headerLabel;QLabel *implementationLabel;QLineEdit *outputDirLineEdit;QLineEdit *headerLineEdit;QLineEdit *implementationLineEdit;
};class ConclusionPage : public QWizardPage
{Q_OBJECTpublic:ConclusionPage(QWidget *parent = 0);protected:void initializePage() override;private:QLabel *label;
};#endif

.cpp

#include <QtWidgets>#include "classwizard.h"ClassWizard::ClassWizard(QWidget *parent): QWizard(parent)
{addPage(new IntroPage);addPage(new ClassInfoPage);addPage(new CodeStylePage);addPage(new OutputFilesPage);addPage(new ConclusionPage);setPixmap(QWizard::BannerPixmap, QPixmap(":/images/banner.png"));setPixmap(QWizard::BackgroundPixmap, QPixmap(":/images/background.png"));setWindowTitle(tr("Class Wizard"));
}void ClassWizard::accept()
{QByteArray className = field("className").toByteArray();QByteArray baseClass = field("baseClass").toByteArray();QByteArray macroName = field("macroName").toByteArray();QByteArray baseInclude = field("baseInclude").toByteArray();QString outputDir = field("outputDir").toString();QString header = field("header").toString();QString implementation = field("implementation").toString();QByteArray block;if (field("comment").toBool()) {block += "/*\n";block += "    " + header.toLatin1() + '\n';block += "*/\n";block += '\n';}if (field("protect").toBool()) {block += "#ifndef " + macroName + '\n';block += "#define " + macroName + '\n';block += '\n';}if (field("includeBase").toBool()) {block += "#include " + baseInclude + '\n';block += '\n';}block += "class " + className;if (!baseClass.isEmpty())block += " : public " + baseClass;block += '\n';block += "{\n";/* qmake ignore Q_OBJECT */if (field("qobjectMacro").toBool()) {block += "    Q_OBJECT\n";block += '\n';}block += "public:\n";if (field("qobjectCtor").toBool()) {block += "    " + className + "(QObject *parent = 0);\n";} else if (field("qwidgetCtor").toBool()) {block += "    " + className + "(QWidget *parent = 0);\n";} else if (field("defaultCtor").toBool()) {block += "    " + className + "();\n";if (field("copyCtor").toBool()) {block += "    " + className + "(const " + className + " &other);\n";block += '\n';block += "    " + className + " &operator=" + "(const " + className+ " &other);\n";}}block += "};\n";if (field("protect").toBool()) {block += '\n';block += "#endif\n";}QFile headerFile(outputDir + '/' + header);if (!headerFile.open(QFile::WriteOnly | QFile::Text)) {QMessageBox::warning(0, QObject::tr("Simple Wizard"),QObject::tr("Cannot write file %1:\n%2").arg(headerFile.fileName()).arg(headerFile.errorString()));return;}headerFile.write(block);block.clear();if (field("comment").toBool()) {block += "/*\n";block += "    " + implementation.toLatin1() + '\n';block += "*/\n";block += '\n';}block += "#include \"" + header.toLatin1() + "\"\n";block += '\n';if (field("qobjectCtor").toBool()) {block += className + "::" + className + "(QObject *parent)\n";block += "    : " + baseClass + "(parent)\n";block += "{\n";block += "}\n";} else if (field("qwidgetCtor").toBool()) {block += className + "::" + className + "(QWidget *parent)\n";block += "    : " + baseClass + "(parent)\n";block += "{\n";block += "}\n";} else if (field("defaultCtor").toBool()) {block += className + "::" + className + "()\n";block += "{\n";block += "    // missing code\n";block += "}\n";if (field("copyCtor").toBool()) {block += "\n";block += className + "::" + className + "(const " + className+ " &other)\n";block += "{\n";block += "    *this = other;\n";block += "}\n";block += '\n';block += className + " &" + className + "::operator=(const "+ className + " &other)\n";block += "{\n";if (!baseClass.isEmpty())block += "    " + baseClass + "::operator=(other);\n";block += "    // missing code\n";block += "    return *this;\n";block += "}\n";}}QFile implementationFile(outputDir + '/' + implementation);if (!implementationFile.open(QFile::WriteOnly | QFile::Text)) {QMessageBox::warning(0, QObject::tr("Simple Wizard"),QObject::tr("Cannot write file %1:\n%2").arg(implementationFile.fileName()).arg(implementationFile.errorString()));return;}implementationFile.write(block);QDialog::accept();
}IntroPage::IntroPage(QWidget *parent): QWizardPage(parent)
{setTitle(tr("Introduction"));setPixmap(QWizard::WatermarkPixmap, QPixmap(":/images/watermark1.png"));label = new QLabel(tr("This wizard will generate a skeleton C++ class ""definition, including a few functions. You simply ""need to specify the class name and set a few ""options to produce a header file and an ""implementation file for your new C++ class."));label->setWordWrap(true);QVBoxLayout *layout = new QVBoxLayout;layout->addWidget(label);setLayout(layout);
}ClassInfoPage::ClassInfoPage(QWidget *parent): QWizardPage(parent)
{setTitle(tr("Class Information"));setSubTitle(tr("Specify basic information about the class for which you ""want to generate skeleton source code files."));setPixmap(QWizard::LogoPixmap, QPixmap(":/images/logo1.png"));classNameLabel = new QLabel(tr("&Class name:"));classNameLineEdit = new QLineEdit;classNameLabel->setBuddy(classNameLineEdit);baseClassLabel = new QLabel(tr("B&ase class:"));baseClassLineEdit = new QLineEdit;baseClassLabel->setBuddy(baseClassLineEdit);qobjectMacroCheckBox = new QCheckBox(tr("Generate Q_OBJECT &macro"));groupBox = new QGroupBox(tr("C&onstructor"));qobjectCtorRadioButton = new QRadioButton(tr("&QObject-style constructor"));qwidgetCtorRadioButton = new QRadioButton(tr("Q&Widget-style constructor"));defaultCtorRadioButton = new QRadioButton(tr("&Default constructor"));copyCtorCheckBox = new QCheckBox(tr("&Generate copy constructor and ""operator="));defaultCtorRadioButton->setChecked(true);connect(defaultCtorRadioButton, &QAbstractButton::toggled,copyCtorCheckBox, &QWidget::setEnabled);registerField("className*", classNameLineEdit);registerField("baseClass", baseClassLineEdit);registerField("qobjectMacro", qobjectMacroCheckBox);registerField("qobjectCtor", qobjectCtorRadioButton);registerField("qwidgetCtor", qwidgetCtorRadioButton);registerField("defaultCtor", defaultCtorRadioButton);registerField("copyCtor", copyCtorCheckBox);QVBoxLayout *groupBoxLayout = new QVBoxLayout;groupBoxLayout->addWidget(qobjectCtorRadioButton);groupBoxLayout->addWidget(qwidgetCtorRadioButton);groupBoxLayout->addWidget(defaultCtorRadioButton);groupBoxLayout->addWidget(copyCtorCheckBox);groupBox->setLayout(groupBoxLayout);QGridLayout *layout = new QGridLayout;layout->addWidget(classNameLabel, 0, 0);layout->addWidget(classNameLineEdit, 0, 1);layout->addWidget(baseClassLabel, 1, 0);layout->addWidget(baseClassLineEdit, 1, 1);layout->addWidget(qobjectMacroCheckBox, 2, 0, 1, 2);layout->addWidget(groupBox, 3, 0, 1, 2);setLayout(layout);
}CodeStylePage::CodeStylePage(QWidget *parent): QWizardPage(parent)
{setTitle(tr("Code Style Options"));setSubTitle(tr("Choose the formatting of the generated code."));setPixmap(QWizard::LogoPixmap, QPixmap(":/images/logo2.png"));commentCheckBox = new QCheckBox(tr("&Start generated files with a ""comment"));commentCheckBox->setChecked(true);protectCheckBox = new QCheckBox(tr("&Protect header file against multiple ""inclusions"));protectCheckBox->setChecked(true);macroNameLabel = new QLabel(tr("&Macro name:"));macroNameLineEdit = new QLineEdit;macroNameLabel->setBuddy(macroNameLineEdit);includeBaseCheckBox = new QCheckBox(tr("&Include base class definition"));baseIncludeLabel = new QLabel(tr("Base class include:"));baseIncludeLineEdit = new QLineEdit;baseIncludeLabel->setBuddy(baseIncludeLineEdit);connect(protectCheckBox, &QAbstractButton::toggled,macroNameLabel, &QWidget::setEnabled);connect(protectCheckBox, &QAbstractButton::toggled,macroNameLineEdit, &QWidget::setEnabled);connect(includeBaseCheckBox, &QAbstractButton::toggled,baseIncludeLabel, &QWidget::setEnabled);connect(includeBaseCheckBox, &QAbstractButton::toggled,baseIncludeLineEdit, &QWidget::setEnabled);registerField("comment", commentCheckBox);registerField("protect", protectCheckBox);registerField("macroName", macroNameLineEdit);registerField("includeBase", includeBaseCheckBox);registerField("baseInclude", baseIncludeLineEdit);QGridLayout *layout = new QGridLayout;layout->setColumnMinimumWidth(0, 20);layout->addWidget(commentCheckBox, 0, 0, 1, 3);layout->addWidget(protectCheckBox, 1, 0, 1, 3);layout->addWidget(macroNameLabel, 2, 1);layout->addWidget(macroNameLineEdit, 2, 2);layout->addWidget(includeBaseCheckBox, 3, 0, 1, 3);layout->addWidget(baseIncludeLabel, 4, 1);layout->addWidget(baseIncludeLineEdit, 4, 2);setLayout(layout);
}void CodeStylePage::initializePage()
{QString className = field("className").toString();macroNameLineEdit->setText(className.toUpper() + "_H");QString baseClass = field("baseClass").toString();includeBaseCheckBox->setChecked(!baseClass.isEmpty());includeBaseCheckBox->setEnabled(!baseClass.isEmpty());baseIncludeLabel->setEnabled(!baseClass.isEmpty());baseIncludeLineEdit->setEnabled(!baseClass.isEmpty());QRegularExpression rx("Q[A-Z].*");if (baseClass.isEmpty()) {baseIncludeLineEdit->clear();} else if (rx.match(baseClass).hasMatch()) {baseIncludeLineEdit->setText('<' + baseClass + '>');} else {baseIncludeLineEdit->setText('"' + baseClass.toLower() + ".h\"");}
}OutputFilesPage::OutputFilesPage(QWidget *parent): QWizardPage(parent)
{setTitle(tr("Output Files"));setSubTitle(tr("Specify where you want the wizard to put the generated ""skeleton code."));setPixmap(QWizard::LogoPixmap, QPixmap(":/images/logo3.png"));outputDirLabel = new QLabel(tr("&Output directory:"));outputDirLineEdit = new QLineEdit;outputDirLabel->setBuddy(outputDirLineEdit);headerLabel = new QLabel(tr("&Header file name:"));headerLineEdit = new QLineEdit;headerLabel->setBuddy(headerLineEdit);implementationLabel = new QLabel(tr("&Implementation file name:"));implementationLineEdit = new QLineEdit;implementationLabel->setBuddy(implementationLineEdit);registerField("outputDir*", outputDirLineEdit);registerField("header*", headerLineEdit);registerField("implementation*", implementationLineEdit);QGridLayout *layout = new QGridLayout;layout->addWidget(outputDirLabel, 0, 0);layout->addWidget(outputDirLineEdit, 0, 1);layout->addWidget(headerLabel, 1, 0);layout->addWidget(headerLineEdit, 1, 1);layout->addWidget(implementationLabel, 2, 0);layout->addWidget(implementationLineEdit, 2, 1);setLayout(layout);
}void OutputFilesPage::initializePage()
{QString className = field("className").toString();headerLineEdit->setText(className.toLower() + ".h");implementationLineEdit->setText(className.toLower() + ".cpp");outputDirLineEdit->setText(QDir::toNativeSeparators(QDir::tempPath()));
}ConclusionPage::ConclusionPage(QWidget *parent): QWizardPage(parent)
{setTitle(tr("Conclusion"));setPixmap(QWizard::WatermarkPixmap, QPixmap(":/images/watermark2.png"));label = new QLabel;label->setWordWrap(true);QVBoxLayout *layout = new QVBoxLayout;layout->addWidget(label);setLayout(layout);
}void ConclusionPage::initializePage()
{QString finishText = wizard()->buttonText(QWizard::FinishButton);finishText.remove('&');label->setText(tr("Click %1 to generate the class skeleton.")

.main

#include <QApplication>
#include <QTranslator>
#include <QLocale>
#include <QLibraryInfo>#include "classwizard.h"int main(int argc, char *argv[])
{Q_INIT_RESOURCE(classwizard);QApplication app(argc, argv);#ifndef QT_NO_TRANSLATIONQString translatorFileName = QLatin1String("qt_");translatorFileName += QLocale::system().name();QTranslator *translator = new QTranslator(&app);if (translator->load(translatorFileName, QLibraryInfo::location(QLibraryInfo::TranslationsPath)))app.installTranslator(translator);
#endifClassWizard wizard;wizard.show();return app.exec();
}