RefreshListener.java
package de.slothsoft.charts;
/**
* A listener that is used whenever an objects needs refreshing and wants to comunicate
* this fact.
*
* @author Stef Schulz
* @since 0.1.0
*/
public interface RefreshListener {
/**
* Event for the {@link RefreshListener}.
*/
class Event {
final Object source;
/**
* Default constructor.
*
* @param source source of the event; can be null
*/
public Event(Object source) {
this.source = source;
}
/**
* The source of the event.
*
* @return a source; can be null
*/
public Object getSource() {
return this.source;
}
}
/**
* This method indicates something changed on the event's source in a way that makes
* refreshing necessary.
*
* @param event an event with the details; never null
*/
void refreshNeeded(RefreshListener.Event event);
}