Scala で PropertyChangeEvent の発行とかを実装するミックスイン用トレイト ref: http://qiita.com/items/2791

PropertyChangePublisher.scala

import java.beans.{PropertyChangeListener, PropertyChangeSupport, PropertyChangeEvent}

trait PropertyChangePublisher {
  private lazy val propertyChangeSupport = new PropertyChangeSupport(this)

  def addPropertyChangeListener(listener: PropertyChangeListener) =
    propertyChangeSupport.addPropertyChangeListener(listener)

  def removePropertyChangeListener(listener: PropertyChangeListener) =
    propertyChangeSupport.removePropertyChangeListener(listener)

  protected def firePropertyChange(propertyName: String, oldValue: Any, newValue: Any) =
    propertyChangeSupport.firePropertyChange(propertyName, oldValue, newValue)

  protected def firePropertyChange(event: PropertyChangeEvent) =
    propertyChangeSupport.firePropertyChange(event)

  protected def fireIndexedPropertyChange(
      propertyName: String, index: Int, oldValue: Any, newValue: Any) =
    propertyChangeSupport.fireIndexedPropertyChange(propertyName, index, oldValue, newValue)
}

PropertyChangePublisherUsage.scala

class BeanClass extends PropertyChangePublisher {
  private var _name = ""

  def name = _name
  def name_=(newName: String) {
    val oldValue = _name
    _name = newName
    firePropertyChange("name", oldValue, newName)
  }
}