1 /******************************************************************************* 2 * Copyright 2011 See AUTHORS file. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 ******************************************************************************/ 16 17 package com.badlogic.gdx.scenes.scene2d.utils; 18 19 import com.badlogic.gdx.scenes.scene2d.Actor; 20 import com.badlogic.gdx.scenes.scene2d.Event; 21 import com.badlogic.gdx.scenes.scene2d.EventListener; 22 23 /** Listener for {@link ChangeEvent}. 24 * @author Nathan Sweet */ 25 abstract public class ChangeListener implements EventListener { handle(Event event)26 public boolean handle (Event event) { 27 if (!(event instanceof ChangeEvent)) return false; 28 changed((ChangeEvent)event, event.getTarget()); 29 return false; 30 } 31 32 /** @param actor The event target, which is the actor that emitted the change event. */ changed(ChangeEvent event, Actor actor)33 abstract public void changed (ChangeEvent event, Actor actor); 34 35 /** Fired when something in an actor has changed. This is a generic event, exactly what changed in an actor will vary. 36 * @author Nathan Sweet */ 37 static public class ChangeEvent extends Event { 38 } 39 } 40