Enrichment classes over JavaFX bindings to provide monadic operations in Scala.
Implemented using the functional programming type-classes from non/cats.
monadic-jfx requires Scala 2.11 and Java 8 build >= 40.
The SBT dependency is:
libraryDependencies += "com.elderresearch" %% "monadic-jfx" % "0.1.1"In your code, add:
import eri.viz.gui.jfx.monadic._And then you can create derived bindings with map and flatMap from a JavaFX property/observable value:
import javafx.beans.property.SimpleObjectProperty
import javafx.scene.control.Label
import eri.viz.gui.jfx.monadic._
// Create a simple data model with property hierarchy
class Player {
val name = new SimpleObjectProperty[String]("Player 1")
val stats = new SimpleObjectProperty[PlayerStats](new PlayerStats)
}
class PlayerStats {
val highScore = new SimpleObjectProperty[Integer](0)
val losses = new SimpleObjectProperty[Integer](0)
}
// Root property
val currentPlayer = new SimpleObjectProperty[Player]
// Some controls with properties to bind
val nameLabel = new Label
val highScoreLabel = new Label
// Name is a simple first order property
nameLabel.textProperty().bind(
currentPlayer.flatMap(_.name)
)
// High Score is a second order property with a transformation
highScoreLabel.textProperty().bind(
currentPlayer
.flatMap(_.stats)
.flatMap(_.highScore)
.map(s ⇒ s">> $s <<")
)
// Same thing, but using a for comprehension
highScoreLabel.textProperty().bind(
for {
p ← currentPlayer
s ← p.stats
hs ← s.highScore
} yield s">> $hs <<"
)
// Test property binding
assert(nameLabel.getText == null)
assert(highScoreLabel.getText == null)
currentPlayer.set(new Player)
assert(nameLabel.getText == "Player 1")
assert(highScoreLabel.getText == ">> 0 <<")
currentPlayer.get.stats.get.highScore.set(1000000)
assert(highScoreLabel.getText == ">> 1000000 <<")