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Please review the following information to ensure ** the GNU Free Documentation License version 1.3 requirements ** will be met: https://www.gnu.org/licenses/fdl-1.3.html. ** $QT_END_LICENSE$ ** ****************************************************************************/ /*! \example dialogs/licensewizard \title License Wizard Example \ingroup examples-dialogs \brief 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 \li \c LicenseWizard inherits QWizard and implements a non-linear five-page wizard that leads the user through the process of choosing a license agreement. \li \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 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 \li Class name \li Enum value \li Page ID \row \li \c IntroPage \li \c Page_Intro \li 0 \row \li \c EvaluatePage \li \c Page_Evaluate \li 1 \row \li \c RegisterPage \li \c Page_Register \li 2 \row \li \c DetailsPage \li \c Page_Details \li 3 \row \li \c ConclusionPage \li \c Page_Conclusion \li 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 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 dialogs/licensewizard/licensewizard.cpp 3 \snippet dialogs/licensewizard/licensewizard.cpp 4 We set the style to \l{QWizard::}{ModernStyle} on all platforms except \macos, \snippet dialogs/licensewizard/licensewizard.cpp 5 \snippet dialogs/licensewizard/licensewizard.cpp 6 We configure the QWizard to show a \uicontrol 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 dialogs/licensewizard/licensewizard.cpp 9 \snippet dialogs/licensewizard/licensewizard.cpp 11 \dots \snippet dialogs/licensewizard/licensewizard.cpp 13 In \c showHelp(), we display help texts that are appropriate for the current page. If the user clicks \uicontrol 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 dialogs/licensewizard/licensewizard.h 4 \codeline \snippet 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 dialogs/licensewizard/licensewizard.cpp 17 \snippet dialogs/licensewizard/licensewizard.cpp 19 The \c nextId() function returns the ID for \c EvaluatePage if the \uicontrol{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 dialogs/licensewizard/licensewizard.h 5 \codeline \snippet dialogs/licensewizard/licensewizard.cpp 20 \dots \snippet dialogs/licensewizard/licensewizard.cpp 21 \dots \snippet 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 \uicontrol Next button (\uicontrol Continue on \macos). The fields' values can be accessed from any other page using QWizardPage::field(). Resetting the page amounts to clearing the two text fields. \snippet 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 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 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 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 dialogs/licensewizard/licensewizard.cpp 28 We want to display a \uicontrol Print button in the wizard when the \c ConclusionPage is up. One way to accomplish this is to reimplement QWidget::setVisible(): \list \li If the page is shown, we set the \l{QWizard::}{CustomButton1} button's text to \uicontrol{\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. \li 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} */