Qt Bridges - Java/Kotlin

java --version
gradle --version

curl -O 'https://code.qt.io/cgit/qt/qtbridge-java.git/plain/examples/starter/qtbridge.starter.gradle.kts?h=dev' \
     -O 'https://code.qt.io/cgit/qt/qtbridge-java.git/plain/examples/starter/settings.gradle.kts?h=dev'

gradle --init-script qtbridge.starter.gradle.kts usage

gradle --init-script qtbridge.starter.gradle.kts

 gradle --init-script qtbridge.starter.gradle.kts \
 -PprojectName=MyAwesomeApp \
 -PpackageName=com.company.app \
-Planguage=kotlin

\c MyAwesomeApp/
├── src/
│   └── main/
│       ├── kotlin/           (or java/)
│       │   └── com/
│       │       └── company/
│       │           └── app/
│       │               ├── Main.kt            (or Main.java)
│       │               └── Controller.kt      (or Controller.java)
│       └── qml/
│           └── main.qml
├── build.gradle.kts
└── settings.gradle.kts

cd MyAwesomeApp
gradle MyAwesomeApp

// Registers this class as QML singleton
@QMLRegistrable(singleton = true)
public class FruitBasket {
    // Establishes a binding to a callback interface that is used to emit signals or notifications
    // from Java to QML. This allows QML to react to specific events like validation failures or updates.
    public interface QmlCallback {
        void basketSold(Integer price);
        void basketStolen();
    }
    @QMLSignals
    QmlCallback qmlCallback;

    // A QtListModel of strings, bridged to QML as a QAbstractListModel.
    // This allows it to be used in model-driven QML components
    public final QtListModel<String> fruitList =
            new QtListModel<>(new ArrayList<>(Arrays.asList("Mango", "Kiwi")));

    // An Integer bridged to QML. Can be used on QML-side as a standard read-write property
    public QtProperty<Integer> fruitBasketPrice = new QtProperty<>(24);

    {
        // Observe fruitList changes
        fruitList.onSizeChanged(() -> System.out.println("List size changed to: " + fruitList.size()));
        // Observe price changes
        fruitBasketPrice.onValueChanged(() -> System.out.println("Fruit basket price changed"));
    }

    // Function that is invokable from QML
    public void sellAllFruits() {
        System.out.println("Selling all fruits");
        // Inform QML that sale was a success
        qmlCallback.basketSold(25);
    }