Mutli Date Range Selector JavaFX Control

MultiDateRangeSelector.kt

import javafx.application.Application
import javafx.beans.property.SimpleStringProperty
import javafx.collections.FXCollections
import javafx.collections.ObservableList
import javafx.scene.control.TextField
import tornadofx.*
import java.time.LocalDate
import java.time.format.DateTimeFormatter


fun main() {
	Application.launch(MyApp::class.java)
}

class MyApp: App(MyView::class)

class MyView: View() {
	override val root = borderpane {
		val dateRanges = FXCollections.observableArrayList<ClosedRange<LocalDate>>()
		left = MultiDateRangeSelector(dateRanges)
		center = tableview(dateRanges) {
			readonlyColumn("START", ClosedRange<LocalDate>::start)
			readonlyColumn("END", ClosedRange<LocalDate>::endInclusive)
		}
	}
}

class MultiDateRangeSelector(dateRanges: ObservableList<ClosedRange<LocalDate>>? = null): TextField() {

	private val dateTimeFormat = DateTimeFormatter.ofPattern("M/d/yyyy")

	private val _dateRanges = dateRanges ?: FXCollections.observableArrayList<ClosedRange<LocalDate>>()
	val dateRanges = FXCollections.unmodifiableObservableList(_dateRanges)

	private val toolTipTextProperty = SimpleStringProperty()

	init {
		textProperty().onChange {
			update()
		}
		tooltip {
			textProperty().bind(toolTipTextProperty)
		}
	}

	private fun update() {
		try {
			text.split(",")
					.asSequence()
					.map { it.trim() }
					.filter {
						it.matches(Regex("[0-9]{1,2}/[0-9]{1,2}/[0-9]{4}(-[0-9]{1,2}/[0-9]{1,2}/[0-9]{4})?"))
					}
					.map { dateRangeStr ->
						dateRangeStr.split("-")
								.asSequence()
								.map { it.trim() }
								.filter {
									it.matches(Regex("[0-9]{1,2}/[0-9]{1,2}/[0-9]{4}"))
								}.map { LocalDate.parse(it, dateTimeFormat) }
								.toList()
					}.filter { it.count() in 1..2 }
					.map {
						when {
							it.count() == 1 -> it[0]..it[0]
							it.count() == 2 -> it[0]..it[1]
							else -> throw Exception("Must be 1 to 2 elements")
						}
					}
					.toList().also {

						_dateRanges.setAll(it)

						toolTipTextProperty.set(
								dateRanges?.asSequence()
								?.map {
									when {
										it.start == it.endInclusive -> "${it.start.format(dateTimeFormat)}"
										else -> "${it.start.format(dateTimeFormat)}-${it.endInclusive.format(dateTimeFormat)}"
									}
								}
								?.joinToString("\r\n")
						)
					}
		} catch (e: Exception) {
			_dateRanges.clear()
			toolTipTextProperty.set(null)
		}
	}
}