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• EventSource.scala

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com.mle.events.EventSource.scala Maven / Gradle / Ivy

package com.mle.android.events

import scala.collection.mutable
import scala.collection.mutable.ListBuffer

/**
 *
 * Inspiration: https://lampsvn.epfl.ch/trac/scala/browser/scala/trunk/src/swing/scala/swing/Reactions.scala
 *
 * TODO use rx instead.
 *
 * @tparam T type of event
 */
trait EventSource[T] {
  type EventHandler = PartialFunction[T, Unit]

  private val handlers: mutable.Buffer[EventHandler] = new ListBuffer[EventHandler]

  /**
   * This is method protected so that only event sources may fire messages,
   * but anyone can listen by adding event handlers.
   *
   * @param event event to fire
   */
  protected def fire(event: T): Unit =
    handlers.filter(_.isDefinedAt(event)).foreach(h => h(event))

  /**
   * Remember to call `removeHandler`.
   *
   * @param handler
   */
  def addHandler(handler: EventHandler): Unit = handlers += handler

  def removeHandler(handler: EventHandler): Unit = handlers -= handler
}