ScalaFx Bind ImageView to custom Enumeration - scala

Question

I just started to write scalafx application and have a question about bindings.
I have an Enumeration with connection status in my presenter class and I want to select appropriate icon in label in view class. I basically can create binding in javafx way and set converter which will select appropriate ImageView every time status changes, but is it possible to do in ScalaFX way?
I looked many scalafx examples, but still can't find anything like this.
Here is some code:
package view
import scalafx.beans.property.ObjectProperty
class MainWindowPresenter {
object DatabaseState extends Enumeration {
type DatabaseState = Value
val NOT_CONNECTED, IDLE, BUSY, ERROR = Value
}
val login = new ObjectProperty[String](this, "login", "awesomeloginname")
val state = new ObjectProperty[DatabaseState.DatabaseState](this, "state", DatabaseState.ERROR)
}
View class:
package view
import java.util.concurrent.Callable
import javafx.beans.binding.ObjectBinding
import collection.immutable.HashMap
import javafx.scene.control.SeparatorMenuItem
import scala.util.Random
import scalafx.beans.property.{ObjectProperty}
import scalafx.geometry.{Orientation, Insets, Pos}
import scalafx.scene.control._
import scalafx.scene.image.{ImageView, Image}
import scalafx.scene.layout._
import scalafx.Includes._
class MainWindowView extends BorderPane {
val model = new MainWindowPresenter
top = new HBox {
content = List(
new Label() {
graphic <== //somehow select imageview depending on model.state
}
)
}
private def imageFromResource(name : String) =
new ImageView(new Image(getClass.getClassLoader.getResourceAsStream(name)))
}
Thanks in advance and sorry for grammar mistakes, if any - English isn't my native.

Answer 1

You can use EasyBind or the snapshot (2.0-SNAPSHOT) version of ReactFX to create the binding. Both are Java libraries, but they are easy to use from Scala. This is the EasyBind way:
graphic <== EasyBind.map(model.state, stateToImage)
val stateToImage: Function1[DatabaseState.DatabaseState, ImageView] = {
// convert state to ImageView
}
This code uses the implicit conversion from Scala's Function1 to Java's Function.
You could also define an implicit conversion from ScalaFX ObjectProperty to EasyBind's MonadicObservableValue and then the first line above can be rewritten to:
graphic <== model.state.map(stateToImage)