/* Title: Tools/Graphview/mutator_event.scala
Author: Markus Kaiser, TU Muenchen
Author: Makarius
Events for dialog synchronization.
*/
package isabelle.graphview
import isabelle._
import scala.collection.mutable
import java.awt.Color
object Mutator_Event
{
sealed abstract class Message
case class Add(m: Mutator.Info) extends Message
case class New_List(m: List[Mutator.Info]) extends Message
type Receiver = PartialFunction[Message, Unit]
class Bus
{
private val receivers = new mutable.ListBuffer[Receiver]
def += (r: Receiver) { GUI_Thread.require {}; receivers += r }
def -= (r: Receiver) { GUI_Thread.require {}; receivers -= r }
def event(x: Message) { GUI_Thread.require {}; receivers.foreach(r => r(x)) }
}
}