1 /* 2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package javafx.beans; 27 28 import javafx.beans.value.ObservableValue; 29 30 /** 31 * An {@code InvalidationListener} is notified whenever an 32 * {@link Observable} becomes invalid. It can be registered and 33 * unregistered with {@link Observable#addListener(InvalidationListener)} 34 * respectively {@link Observable#removeListener(InvalidationListener)}. 35 * <p> 36 * For an in-depth explanation of invalidation events and how they differ from 37 * change events, see the documentation of {@code ObservableValue}. 38 * <p> 39 * The same instance of {@code InvalidationListener} can be registered to listen 40 * to multiple {@code Observables}. 41 * 42 * @see Observable 43 * @see ObservableValue 44 * 45 * 46 * @since JavaFX 2.0 47 */ 48 @FunctionalInterface 49 public interface InvalidationListener { 50 51 /** 52 * This method needs to be provided by an implementation of 53 * {@code InvalidationListener}. It is called if an {@link Observable} 54 * becomes invalid. 55 * <p> 56 * In general, it is considered bad practice to modify the observed value in 57 * this method. 58 * 59 * @param observable 60 * The {@code Observable} that became invalid 61 */ 62 public void invalidated(Observable observable); 63 }