How to subscribe to Action property change with scala.swing listenTo?

Question

I have a scala.swing Action with a custom property mydomain.color. I would like to repaint a button which is bound to this Action whenever the property is changed. It should be possible to subscribe to PropertyChangeEvent, however Action is not a Publisher, therefore it cannot be used for listenTo.

It would be possible to do it a normal Java way and to write a Property Change Listener, but is there perhaps some shorter way? Can Java beans be used as Publishers for scala.swing listenTo?

Answer 1

A property change listener can be used to transform the Java beans event into a swing one and publish it, it is not that difficult:

import scala.swing._
import scala.swing.event._
import java.beans.{PropertyChangeListener, PropertyChangeEvent}

case class PropertyChanged(source: AnyRef, propertyName: String, oldValue: AnyRef, newValue: AnyRef) extends Event

trait ActionPropertyPublisher extends Action with Publisher {
  actionPublisher =>

  class ListenToPropertyChange extends PropertyChangeListener {
    override def propertyChange(evt: PropertyChangeEvent): Unit = {
      assert(SwingUtilities.isEventDispatchThread)
      assert(evt.getSource==actionPublisher.peer)
      publish(new PropertyChanged(actionPublisher,evt.getPropertyName,evt.getOldValue,evt.getNewValue))
    }
  }

  peer.addPropertyChangeListener(new ListenToPropertyChange())
}