Commit be5e9abf authored by h2b's avatar h2b

Convenience subscriber class added.

parent b82e5ec7
SimGraf - A Simple Scala Graphics Library
Copyright 2016-2017 Hans-Hermann Bode
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
See the License for the specific language governing permissions and
limitations under the License.
package de.h2b.scala.lib.simgraf.event
import{ Actor, ActorRef, Props }
import de.h2b.scala.lib.util.{ Level, Logger }
* Provides an actor subscribing to `Event`s received from the package object's
* global event stream.
* @since 1.2.0
* @author h2b
class Subscriber private (val handler: PartialFunction[Event, Unit]) extends Actor {
override def preStart = stream.subscribe(self, classOf[Event])
private val log = Logger(getClass) at Level.Warn
def receive = {
case e: Event
log.debug(s"event received: $e")
case unknown
log.warn(s"unknown message received: $unknown")
object Subscriber {
* @param handler partial function handling received events
* @return a reference to a new subscriber
def ref (handler: PartialFunction[Event, Unit]): ActorRef =
system.actorOf(Props(new Subscriber(handler)))
......@@ -19,11 +19,10 @@ package de.h2b.scala.lib.simgraf.demo
import scala.util.Random
import{ Actor, Props }
import de.h2b.scala.lib.simgraf.event.{ Event, KeyEvent, MouseEvent, stream, system }
import de.h2b.scala.lib.simgraf.{ Color, Point, World }
import de.h2b.scala.lib.simgraf.event.{ Event, Subscriber }
import de.h2b.scala.lib.simgraf.layout.GridLayout
import de.h2b.scala.lib.simgraf.shapes.{ Coloring, Rectangle }
import de.h2b.scala.lib.simgraf.{ Color, Point, World }
object EventEchoDemo extends App {
......@@ -34,13 +33,8 @@ object EventEchoDemo extends App {
world.fill(Coloring(_ =>
Color(Random.nextInt(256), Random.nextInt(256), Random.nextInt(256))))
class EventSubscriber extends Actor {
override def preStart = stream.subscribe(self, classOf[Event])
def receive = {
case e: Event println(e)
Subscriber.ref {
case e: Event println(e)
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