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/*!

    \example dialogs/licensewizard

    \title License Wizard Example

    The License Wizard example shows how to implement complex wizards in

    Qt.

    \image licensewizard-example.png Screenshot of the License Wizard example

    Most wizards have a linear structure, with page 1 followed by

    page 2 and so on until the last page. The

    \l{dialogs/classwizard}{Class Wizard} example shows how to create

    such wizards.

    Some wizards are more complex in that they allow different

    traversal paths based on the information provided by the user.

    The License Wizard example illustrates this. It provides five

    wizard pages; depending on which options are selected, the user

    can reach different pages.

    \image licensewizard-flow.png The License Wizard pages

    The example consists of the following classes:

    \list

    \o \c LicenseWizard inherits QWizard and implements a non-linear

       five-page wizard that leads the user through the process of

       choosing a license agreement.

    \o \c IntroPage, \c EvaluatePage, \c RegisterPage, \c

       DetailsPage, and \c ConclusionPage are QWizardPage subclasses

       that implement the wizard pages.

    \endlist

    \section1 The LicenseWizard Class

    The \c LicenseWizard class derives from QWizard and provides a

    five-page wizard that guides the user through the process of

    registering their copy of a fictitious software product. Here's

    the class definition:

    \snippet examples/dialogs/licensewizard/licensewizard.h 1

    The class's public API is limited to a constructor and an enum.

    The enum defines the IDs associated with the various pages:

    \table

    \header \o Class name \o Enum value \o Page ID

    \row \o \c IntroPage \o \c Page_Intro \o 0

    \row \o \c EvaluatePage \o \c Page_Evaluate \o 1

    \row \o \c RegisterPage \o \c Page_Register \o 2

    \row \o \c DetailsPage \o \c Page_Details \o 3

    \row \o \c ConclusionPage \o \c Page_Conclusion \o 4

    \endtable

    For this example, the IDs are arbitrary. The only constraints are

    that they must be unique and different from -1. IDs allow us to

    refer to pages.

    \snippet examples/dialogs/licensewizard/licensewizard.cpp 2

    In the constructor, we create the five pages, insert them into

    the wizard using QWizard::setPage(), and set \c Page_Intro to be

    the first page.

    \snippet examples/dialogs/licensewizard/licensewizard.cpp 3

    \snippet examples/dialogs/licensewizard/licensewizard.cpp 4

    We set the style to \l{QWizard::}{ModernStyle} on all platforms

    except Mac OS X,

    \snippet examples/dialogs/licensewizard/licensewizard.cpp 5

    \snippet examples/dialogs/licensewizard/licensewizard.cpp 6

    We configure the QWizard to show a \gui Help button, which is

    connected to our \c showHelp() slot. We also set the

    \l{QWizard::}{LogoPixmap} for all pages that have a header (i.e.,

    \c EvaluatePage, \c RegisterPage, and \c DetailsPage).

    \snippet examples/dialogs/licensewizard/licensewizard.cpp 9

    \snippet examples/dialogs/licensewizard/licensewizard.cpp 11

    \dots

    \snippet examples/dialogs/licensewizard/licensewizard.cpp 13

    In \c showHelp(), we display help texts that are appropiate for

    the current page. If the user clicks \gui Help twice for the same

    page, we say, "Sorry, I already gave what help I could. Maybe you

    should try asking a human?"

    \section1 The IntroPage Class

    The pages are defined in \c licensewizard.h and implemented in \c

    licensewizard.cpp, together with \c LicenseWizard.

    Here's the definition and implementation of \c{IntroPage}:

    \snippet examples/dialogs/licensewizard/licensewizard.h 4

    \codeline

    \snippet examples/dialogs/licensewizard/licensewizard.cpp 16

    A page inherits from QWizardPage. We set a

    \l{QWizardPage::}{title} and a

    \l{QWizard::WatermarkPixmap}{watermark pixmap}. By not setting

    any \l{QWizardPage::}{subTitle}, we ensure that no header is

    displayed for this page. (On Windows, it is customary for wizards

    to display a watermark pixmap on the first and last pages, and to

    have a header on the other pages.)

    \snippet examples/dialogs/licensewizard/licensewizard.cpp 17

    \snippet examples/dialogs/licensewizard/licensewizard.cpp 19

    The \c nextId() function returns the ID for \c EvaluatePage if

    the \gui{Evaluate the product for 30 days} option is checked;

    otherwise it returns the ID for \c RegisterPage.

    \section1 The EvaluatePage Class

    The \c EvaluatePage is slightly more involved:

    \snippet examples/dialogs/licensewizard/licensewizard.h 5

    \codeline

    \snippet examples/dialogs/licensewizard/licensewizard.cpp 20

    \dots

    \snippet examples/dialogs/licensewizard/licensewizard.cpp 21

    \dots

    \snippet examples/dialogs/licensewizard/licensewizard.cpp 22

    First, we set the page's \l{QWizardPage::}{title}

    and \l{QWizardPage::}{subTitle}.

    Then we create the child widgets, create \l{Registering and Using

    Fields}{wizard fields} associated with them, and put them into

    layouts. The fields are created with an asterisk (\c

    *) next to their name. This makes them \l{mandatory fields}, that

    is, fields that must be filled before the user can press the

    \gui Next button (\gui Continue on Mac OS X). The fields' values

    can be accessed from any other page using QWizardPage::field().

    Resetting the page amounts to clearing the two text fields.

    \snippet examples/dialogs/licensewizard/licensewizard.cpp 23

    The next page is always the \c ConclusionPage.

    \section1 The ConclusionPage Class

    The \c RegisterPage and \c DetailsPage are very similar to \c

    EvaluatePage. Let's go directly to the \c ConclusionPage:

    \snippet examples/dialogs/licensewizard/licensewizard.h 6

    This time, we reimplement QWizardPage::initializePage() and

    QWidget::setVisible(), in addition to

    \l{QWizardPage::}{nextId()}. We also declare a private slot:

    \c printButtonClicked().

    \snippet examples/dialogs/licensewizard/licensewizard.cpp 18

    The default implementation of QWizardPage::nextId() returns

    the page with the next ID, or -1 if the current page has the

    highest ID. This behavior would work here, because \c

    Page_Conclusion equals 5 and there is no page with a higher ID,

    but to avoid relying on such subtle behavior, we reimplement

    \l{QWizardPage::}{nextId()} to return -1.

    \snippet examples/dialogs/licensewizard/licensewizard.cpp 27

    We use QWizard::hasVisitedPage() to determine the type of

    license agreement the user has chosen. If the user filled the \c

    EvaluatePage, the license text refers to an Evaluation License

    Agreement. If the user filled the \c DetailsPage, the license

    text is a First-Time License Agreement. If the user provided an

    upgrade key and skipped the \c DetailsPage, the license text is

    an Update License Agreement.

    \snippet examples/dialogs/licensewizard/licensewizard.cpp 28

    We want to display a \gui Print button in the wizard when the \c

    ConclusionPage is up. One way to accomplish this is to reimplement

    QWidget::setVisible():

    \list

    \o If the page is shown, we set the \l{QWizard::}{CustomButton1} button's

       text to \gui{\underline{P}rint}, we enable the \l{QWizard::}{HaveCustomButton1}

       option, and we connect the QWizard's \l{QWizard::}{customButtonClicked()}

       signal to our \c printButtonClicked() slot.

    \o If the page is hidden, we disable the \l{QWizard::}{HaveCustomButton1}

       option and disconnect the \c printButtonClicked() slot.

    \endlist

    \sa QWizard, {Class Wizard Example}, {Trivial Wizard Example}

*/