如何订阅 Action 属性 change with scala.swing listenTo？

Question

我有一个 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，因此不能用于 listenTo。

用正常的 Java 方式和 write a Property Change Listener 是可能的，但是是否有更短的方式？ Java beans 可以用作 scala.swing listenTo 的发布者吗？

Answer 1

一个属性改变监听器可以用来将Java beans事件转化为一个swing事件并发布，并不难：

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())
}

如何订阅 Action 属性 change with scala.swing listenTo？

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

events

swing

scala

properties

javabeans