UpdatableTableView.kt

import javafx.application.Application
import javafx.beans.property.SimpleIntegerProperty
import javafx.scene.control.Button
import javafx.scene.layout.VBox
import tornadofx.*
import java.time.LocalDate
import java.time.Period

class Person(id: Int, name: String, birthday: LocalDate) {
    var id by property(id)
    fun idProperty() = getProperty(Person::id)

    var name by property(name)
    fun nameProperty() = getProperty(Person::name)

    var birthday by property(birthday)
    fun birthdayProperty() = getProperty(Person::birthday)

    // val age: Int get() = Period.between(birthday, LocalDate.now()).years

    val age: SimpleIntegerProperty get() = SimpleIntegerProperty(Period.between(birthday, LocalDate.now()).years)
}


private val persons = listOf(
        Person(1,"Samantha Stuart",LocalDate.of(1981,12,4)),
        Person(2,"Tom Marks",LocalDate.of(2001,1,23)),
        Person(3,"Stuart Gills",LocalDate.of(1989,5,23)),
        Person(3,"Nicole Williams",LocalDate.of(1998,8,11))
).observable()

class MyView : View() {

    override val root = VBox()

    init {
        with(root) {
            Button("Press Me")
            Button("Foo")
            tableview(persons) {
                isEditable = true
                column("ID",Person::id).makeEditable()
                column("Name", Person::name).makeEditable()
                val birthday = column("Birthday", Person::birthday).makeEditable()
                val age = column("Age", Person::age)
            }

        }
    }
}

class MyApp: App(MyView::class)

fun main(args: Array<String>) {
    Application.launch(MyApp::class.java, *args)
}