QWizardPage Class

The QWizardPage class is the base class for wizard pages. More...

Header:	#include <QWizardPage>
qmake:	QT += widgets
Since:	Qt 4.3
Inherits:	QWidget

This class was introduced in Qt 4.3.

• List of all members, including inherited members

Properties

• subTitle : QString
• title : QString

Public Functions

	QWizardPage(QWidget *parent = nullptr)
virtual	~QWizardPage()
QString	buttonText(QWizard::WizardButton which) const
virtual void	cleanupPage()
virtual void	initializePage()
bool	isCommitPage() const
virtual bool	isComplete() const
bool	isFinalPage() const
virtual int	nextId() const
QPixmap	pixmap(QWizard::WizardPixmap which) const
void	setButtonText(QWizard::WizardButton which, const QString &text)
void	setCommitPage(bool commitPage)
void	setFinalPage(bool finalPage)
void	setPixmap(QWizard::WizardPixmap which, const QPixmap &pixmap)
void	setSubTitle(const QString &subTitle)
void	setTitle(const QString &title)
QString	subTitle() const
QString	title() const
virtual bool	validatePage()

Signals

void	completeChanged()

Protected Functions

QVariant	field(const QString &name) const
void	registerField(const QString &name, QWidget *widget, const char *property = nullptr, const char *changedSignal = nullptr)
void	setField(const QString &name, const QVariant &value)
QWizard *	wizard() const

Detailed Description

QWizard represents a wizard. Each page is a QWizardPage. When you create your own wizards, you can use QWizardPage directly, or you can subclass it for more control.

A page has the following attributes, which are rendered by QWizard: a title, a subTitle, and a set of pixmaps. See Elements of a Wizard Page for details. Once a page is added to the wizard (using QWizard::addPage() or QWizard::setPage()), wizard() returns a pointer to the associated QWizard object.

Page provides five virtual functions that can be reimplemented to provide custom behavior:

• initializePage() is called to initialize the page's contents when the user clicks the wizard's Next button. If you want to derive the page's default from what the user entered on previous pages, this is the function to reimplement.
• cleanupPage() is called to reset the page's contents when the user clicks the wizard's Back button.
• validatePage() validates the page when the user clicks Next or Finish. It is often used to show an error message if the user has entered incomplete or invalid information.
• nextId() returns the ID of the next page. It is useful when creating non-linear wizards, which allow different traversal paths based on the information provided by the user.
• isComplete() is called to determine whether the Next and/or Finish button should be enabled or disabled. If you reimplement isComplete(), also make sure that completeChanged() is emitted whenever the complete state changes.

Normally, the Next button and the Finish button of a wizard are mutually exclusive. If isFinalPage() returns true, Finish is available; otherwise, Next is available. By default, isFinalPage() is true only when nextId() returns -1. If you want to show Next and Final simultaneously for a page (letting the user perform an "early finish"), call setFinalPage(true) on that page. For wizards that support early finishes, you might also want to set the HaveNextButtonOnLastPage and HaveFinishButtonOnEarlyPages options on the wizard.

In many wizards, the contents of a page may affect the default values of the fields of a later page. To make it easy to communicate between pages, QWizard supports a "field" mechanism that allows you to register a field (e.g., a QLineEdit) on a page and to access its value from any page. Fields are global to the entire wizard and make it easy for any single page to access information stored by another page, without having to put all the logic in QWizard or having the pages know explicitly about each other. Fields are registered using registerField() and can be accessed at any time using field() and setField().

See also QWizard, Class Wizard Example, and License Wizard Example.

Member Function Documentation

QWizardPage::QWizardPage(QWidget *parent = nullptr)

Constructs a wizard page with the given parent.

When the page is inserted into a wizard using QWizard::addPage() or QWizard::setPage(), the parent is automatically set to be the wizard.

See also wizard().

[signal] void QWizardPage::completeChanged()

This signal is emitted whenever the complete state of the page (i.e., the value of isComplete()) changes.

If you reimplement isComplete(), make sure to emit completeChanged() whenever the value of isComplete() changes, to ensure that QWizard updates the enabled or disabled state of its buttons.

See also isComplete().

[virtual] QWizardPage::~QWizardPage()

Destructor.

QString QWizardPage::buttonText(QWizard::WizardButton which) const

Returns the text on button which on this page.

If a text has ben set using setButtonText(), this text is returned. Otherwise, if a text has been set using QWizard::setButtonText(), this text is returned.

By default, the text on buttons depends on the QWizard::wizardStyle. For example, on macOS, the Next button is called Continue.

See also setButtonText(), QWizard::buttonText(), and QWizard::setButtonText().

[virtual] void QWizardPage::cleanupPage()

This virtual function is called by QWizard::cleanupPage() when the user leaves the page by clicking Back (unless the QWizard::IndependentPages option is set).

The default implementation resets the page's fields to their original values (the values they had before initializePage() was called).

See also QWizard::cleanupPage(), initializePage(), and QWizard::IndependentPages.

[protected] QVariant QWizardPage::field(const QString &name) const

Returns the value of the field called name.

This function can be used to access fields on any page of the wizard. It is equivalent to calling wizard()->field(name).

Example:

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

See also QWizard::field(), setField(), and registerField().

[virtual] void QWizardPage::initializePage()

This virtual function is called by QWizard::initializePage() to prepare the page just before it is shown either as a result of QWizard::restart() being called, or as a result of the user clicking Next. (However, if the QWizard::IndependentPages option is set, this function is only called the first time the page is shown.)

By reimplementing this function, you can ensure that the page's fields are properly initialized based on fields from previous pages. For example:

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

The default implementation does nothing.

See also QWizard::initializePage(), cleanupPage(), and QWizard::IndependentPages.

bool QWizardPage::isCommitPage() const

Returns true if this page is a commit page; otherwise returns false.

See also setCommitPage().

[virtual] bool QWizardPage::isComplete() const

This virtual function is called by QWizard to determine whether the Next or Finish button should be enabled or disabled.

The default implementation returns true if all mandatory fields are filled; otherwise, it returns false.

If you reimplement this function, make sure to emit completeChanged(), from the rest of your implementation, whenever the value of isComplete() changes. This ensures that QWizard updates the enabled or disabled state of its buttons. An example of the reimplementation is available here.

See also completeChanged() and isFinalPage().

bool QWizardPage::isFinalPage() const

This function is called by QWizard to determine whether the Finish button should be shown for this page or not.

By default, it returns true if there is no next page (i.e., nextId() returns -1); otherwise, it returns false.

By explicitly calling setFinalPage(true), you can let the user perform an "early finish".

See also isComplete() and QWizard::HaveFinishButtonOnEarlyPages.

[virtual] int QWizardPage::nextId() const

This virtual function is called by QWizard::nextId() to find out which page to show when the user clicks the Next button.

The return value is the ID of the next page, or -1 if no page follows.

By default, this function returns the lowest ID greater than the ID of the current page, or -1 if there is no such ID.

By reimplementing this function, you can specify a dynamic page order. For example:

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

See also QWizard::nextId().

QPixmap QWizardPage::pixmap(QWizard::WizardPixmap which) const

Returns the pixmap set for role which.

Pixmaps can also be set for the entire wizard using QWizard::setPixmap(), in which case they apply for all pages that don't specify a pixmap.

See also setPixmap(), QWizard::pixmap(), and Elements of a Wizard Page.

[protected] void QWizardPage::registerField(const QString &name, QWidget *widget, const char *property = nullptr, const char *changedSignal = nullptr)

Creates a field called name associated with the given property of the given widget. From then on, that property becomes accessible using field() and setField().

Fields are global to the entire wizard and make it easy for any single page to access information stored by another page, without having to put all the logic in QWizard or having the pages know explicitly about each other.

If name ends with an asterisk (*), the field is a mandatory field. When a page has mandatory fields, the Next and/or Finish buttons are enabled only when all mandatory fields are filled. This requires a changedSignal to be specified, to tell QWizard to recheck the value stored by the mandatory field.

QWizard knows the most common Qt widgets. For these (or their subclasses), you don't need to specify a property or a changedSignal. The table below lists these widgets:

Widget	Property	Change Notification Signal
QAbstractButton	bool checked	toggled()
QAbstractSlider	int value	valueChanged()
QComboBox	int currentIndex	currentIndexChanged()
QDateTimeEdit	QDateTime dateTime	dateTimeChanged()
QLineEdit	QString text	textChanged()
QListWidget	int currentRow	currentRowChanged()
QSpinBox	int value	valueChanged()

You can use QWizard::setDefaultProperty() to add entries to this table or to override existing entries.

To consider a field "filled", QWizard simply checks that their current value doesn't equal their original value (the value they had before initializePage() was called). For QLineEdit, it also checks that hasAcceptableInput() returns true, to honor any validator or mask.

QWizard's mandatory field mechanism is provided for convenience. It can be bypassed by reimplementing QWizardPage::isComplete().

See also field(), setField(), and QWizard::setDefaultProperty().

void QWizardPage::setButtonText(QWizard::WizardButton which, const QString &text)

Sets the text on button which to be text on this page.

By default, the text on buttons depends on the QWizard::wizardStyle, but may be redefined for the wizard as a whole using QWizard::setButtonText().

See also buttonText(), QWizard::setButtonText(), and QWizard::buttonText().

void QWizardPage::setCommitPage(bool commitPage)

Sets this page to be a commit page if commitPage is true; otherwise, sets it to be a normal page.

A commit page is a page that represents an action which cannot be undone by clicking Back or Cancel.

A Commit button replaces the Next button on a commit page. Clicking this button simply calls QWizard::next() just like clicking Next does.

A page entered directly from a commit page has its Back button disabled.

See also isCommitPage().

[protected] void QWizardPage::setField(const QString &name, const QVariant &value)

Sets the value of the field called name to value.

This function can be used to set fields on any page of the wizard. It is equivalent to calling wizard()->setField(name, value).

See also QWizard::setField(), field(), and registerField().

void QWizardPage::setFinalPage(bool finalPage)

Explicitly sets this page to be final if finalPage is true.

After calling setFinalPage(true), isFinalPage() returns true and the Finish button is visible (and enabled if isComplete() returns true).

After calling setFinalPage(false), isFinalPage() returns true if nextId() returns -1; otherwise, it returns false.

See also isFinalPage(), isComplete(), and QWizard::HaveFinishButtonOnEarlyPages.

void QWizardPage::setPixmap(QWizard::WizardPixmap which, const QPixmap &pixmap)

Sets the pixmap for role which to pixmap.

The pixmaps are used by QWizard when displaying a page. Which pixmaps are actually used depend on the wizard style.

Pixmaps can also be set for the entire wizard using QWizard::setPixmap(), in which case they apply for all pages that don't specify a pixmap.

See also pixmap(), QWizard::setPixmap(), and Elements of a Wizard Page.

[virtual] bool QWizardPage::validatePage()

This virtual function is called by QWizard::validateCurrentPage() when the user clicks Next or Finish to perform some last-minute validation. If it returns true, the next page is shown (or the wizard finishes); otherwise, the current page stays up.

The default implementation returns true.

When possible, it is usually better style to disable the Next or Finish button (by specifying mandatory fields or reimplementing isComplete()) than to reimplement validatePage().

See also QWizard::validateCurrentPage() and isComplete().

[protected] QWizard *QWizardPage::wizard() const

Returns the wizard associated with this page, or nullptr if this page hasn't been inserted into a QWizard yet.

See also QWizard::addPage() and QWizard::setPage().