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Kirigami.AboutPage allows you to have a page that shows the copyright notice of the application together with the list of contributors and some information of which platform it's running on.

First, we are going to edit our main.cpp file from previous tutorials.

main.cpp

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#include <QApplication>
#include <QQmlApplicationEngine>
#include <QtQml>
#include <QUrl>
#include <KAboutData>
#include <KLocalizedContext>
#include <KLocalizedString>

int main(int argc, char *argv[])
{
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);

    QApplication app(argc, argv);

    KLocalizedString::setApplicationDomain("helloworld");
    QCoreApplication::setOrganizationName(QStringLiteral("KDE"));
    QCoreApplication::setOrganizationDomain(QStringLiteral("kde.org"));
    QCoreApplication::setApplicationName(QStringLiteral("Hello World"));

    if (qEnvironmentVariableIsEmpty("QT_QUICK_CONTROLS_STYLE")) {
        QQuickStyle::setStyle(QStringLiteral("org.kde.desktop"));
    }

    KAboutData aboutData(
        QStringLiteral("helloworld"),
        i18nc("@title", "Hello World"),
        QStringLiteral("1.0"),
        i18n("Hello world application"),
        KAboutLicense::GPL,
        i18n("(c) 2021"));

    aboutData.addAuthor(
        i18nc("@info:credit", "Your name"),
        i18nc("@info:credit", "Author Role"),
        QStringLiteral("your@email.com"),
        QStringLiteral("https://yourwebsite.com"));

    // Set aboutData as information about the app
    KAboutData::setApplicationData(aboutData);

    // Register a singleton that will be accessible from QML.
    qmlRegisterSingletonType(
        "org.kde.example", // How the import statement should look like
        1, 0, // Major and minor versions of the import
        "About", // The name of the QML object
        [](QQmlEngine* engine, QJSEngine *) -> QJSValue {
            // Here we retrieve our aboutData and give it to the QML engine
            // to turn it into a QML type
            return engine->toScriptValue(KAboutData::applicationData());
        }
    );

    // Load an application from a QML file
    QQmlApplicationEngine engine;

    engine.rootContext()->setContextObject(new KLocalizedContext(&engine));
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

    if (engine.rootObjects().isEmpty()) {
        return -1;
    }

    return app.exec();
}

In the main.cpp file we include KAboutData , a core KDE frameworks component that lets us store information about our application. This information can then be reused by many other KDE Frameworks components. We instantiate a new aboutData object with its fairly complete default constructor and add author information.

After all the required information has been set, we call KAboutData::setApplicationData to initialize the properties of the QApplication object.

We then create a qmlRegisterSingletonType() . This is used to allow us to import the C++ code as a module in our main.qml with import org.kde.example 1.0.

Its first argument is the URI that will be used for the import, the second and third arguments are major and minor versions respectively, the fourth is the type name, the name that we will call when accessing our About type, and the last is a reference to the C++ object that is exposed to QML. In the latter's case, we use a lambda to instantiate the aboutData of our application in place.

main.qml

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import QtQuick 2.15
import QtQuick.Controls 2.15 as Controls
import QtQuick.Layouts 1.15
import org.kde.kirigami 2.20 as Kirigami

import org.kde.example 1.0

Kirigami.ApplicationWindow {
    id: root

    title: i18nc("@title:window", "Day Kountdown")

    globalDrawer: Kirigami.GlobalDrawer {
        isMenu: true
        actions: [
            Kirigami.Action {
                text: i18n("Quit")
                icon.name: "gtk-quit"
                shortcut: StandardKey.Quit
                onTriggered: Qt.quit()
            },

            Kirigami.Action { // <==== Action to open About page
                text: i18n("About")
                icon.name: "help-about"
                onTriggered: pageStack.layers.push(aboutPage)
            }
        ]
    }

    Component { // <==== Component that instantiates the Kirigami.AboutPage
        id: aboutPage

        Kirigami.AboutPage {
            aboutData: About
        }
    }

    ListModel {
        id: kountdownModel
    }

    AddEditSheet {
        id: addEditSheet
        onAdded: kountdownModel.append({
            "name": name,
            "description": description,
            "date": Date.parse(kdate)
        });
        onEdited: kountdownModel.set(index, {
            "name": name,
            "description": description,
            "date": Date.parse(kdate)
        });
        onRemoved: kountdownModel.remove(index, 1)
    }

    function openPopulatedSheet(mode, index = -1, listName = "", listDesc = "", listDate = "") {
        addEditSheet.mode = mode
        addEditSheet.index = index;
        addEditSheet.name = listName
        addEditSheet.description = listDesc
        addEditSheet.kdate = listDate

        addEditSheet.open()
    }


    pageStack.initialPage: Kirigami.ScrollablePage {
        title: i18nc("@title", "Kountdown")

        actions.main: Kirigami.Action {
            id: addAction
            icon.name: "list-add"
            text: i18nc("@action:button", "Add kountdown")
            onTriggered: openPopulatedSheet("add")
        }

        Kirigami.CardsListView {
            id: layout
            model: kountdownModel
            delegate: KountdownDelegate {}
        }
    }
}

First, we use the import we defined in the main.cpp file, namely org.kde.example. We then add a Kirigami.Action to our global drawer that will send us to the About page, and create a component with a Kirigami.AboutPage in it, which expects a KAboutData::applicationData() object. We exposed precisely that in our main.cpp and called it About, so we can pass it here.

CMakeLists

In the CMakeLists.txt file in our top-level folder, be sure to have CoreAddons in your find_package() call. It is needed for KAboutData .

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add_executable(helloworld)

target_sources(helloworld PRIVATE
    main.cpp
    resources.qrc
)

target_link_libraries(helloworld
    Qt${QT_MAJOR_VERSION}::Quick
    Qt${QT_MAJOR_VERSION}::Qml
    Qt${QT_MAJOR_VERSION}::Gui
    Qt${QT_MAJOR_VERSION}::QuickControls2
    Qt${QT_MAJOR_VERSION}::Widgets
    KF${QT_MAJOR_VERSION}::Kirigami2
    KF${QT_MAJOR_VERSION}::I18n
    KF${QT_MAJOR_VERSION}::CoreAddons
)

In the CMakeLists.txt file in the src/ directory, nothing is needed since we instantiated out aboutData in place.

Uruchamianie aplikacji

Teraz, gdy uruchomisz aplikację i wyzwolisz działanie "About" w globalnej półce, to powinieneś zobaczyć stronę o programie.

Zrzut ekranu strony o programie Kirigami