Get datepicker date on Kotlin TornadoFX - datepicker

Question

I'm studying the basics of TornadoFX for Kotlin.
I have this code:
class MainView : View() {
override val root = vbox()
init {
with(root) {
datepicker {
value = LocalDate.now()
}
button("Choose date") {
textFill = Color.GREEN
action {
println("Button pressed!")
}
}
}
}
}
when the button is pressed, I would like to take the date chosen by the user.
how can I do?

Answer 1

One solution would be to have a LocalDate property bound to the DatePicker, like this:
class MainView : View() {
private val dateProperty = SimpleObjectProperty<LocalDate>()
override val root = vbox()
init {
with(root) {
datepicker(dateProperty) {
value = LocalDate.now()
}
button("Choose date") {
textFill = Color.GREEN
action {
val dateValue = dateProperty.value
println("Button pressed!")
}
}
}
}
}
The other solution would be to have the DatePicker instance in your class, and then take the value from it, like this:
class MainView : View() {
private var datePicker : DatePicker by singleAssign()
override val root = vbox()
init {
with(root) {
datePicker = datepicker {
value = LocalDate.now()
}
button("Choose date") {
textFill = Color.GREEN
action {
val dateValue = datePicker.value
println("Button pressed!")
}
}
}
}
}
Additionally, you can implement a ViewModel, to separate UI and logic, see: Editing Models and Validation
Also, the style of your code can be improved: you can work directly with the VBox, like this:
class MainView : View() {
override val root = vbox {
datepicker {
value = LocalDate.now()
}
button("Choose date") {
textFill = Color.GREEN
action {
println("Button pressed!")
}
}
}
}