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Nifty GUI is a Java Library that supports the building of interactive user interfaces for games or similar applications. It utilizes OpenGL for rendering and it can be easily integrated into many rendering systems. The configuration of the GUI is stored in xml files with little supporting Java code. In short Nifty helps you to layout stuff, display it in a cool way and interact with it :)

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/**
 * Copyright 2005 Bushe Enterprises, Inc., Hopkinton, MA, USA, www.bushe.com
 *
 * 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
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.bushe.swing.event;

/**
 * Callback interface for class-based subscribers of an {@link EventService}.
 *
 * @author Michael Bushe [email protected]
 */
public interface EventSubscriber {

   /**
    * Handle a published event. The EventService calls this method on each publication of an object that matches the
    * class or interface passed to one of the EventService's class-based subscribe methods, specifically, {@link
    * EventService#subscribe(Class,EventSubscriber)} {@link EventService#subscribeExactly(Class,EventSubscriber)}
    * {@link EventService#subscribeStrongly(Class,EventSubscriber)} and {@link EventService#subscribeExactlyStrongly(Class,
    *EventSubscriber)}.
    *
    * @param event The Object that is being published.
    */
   public void onEvent(T event);
}