Spec-Zone .ru
спецификации, руководства, описания, API
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001/* 002 * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved. 003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 004 * 005 * This code is free software; you can redistribute it and/or modify it 006 * under the terms of the GNU General Public License version 2 only, as 007 * published by the Free Software Foundation. Oracle designates this 008 * particular file as subject to the "Classpath" exception as provided 009 * by Oracle in the LICENSE file that accompanied this code. 010 * 011 * This code is distributed in the hope that it will be useful, but WITHOUT 012 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 013 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 014 * version 2 for more details (a copy is included in the LICENSE file that 015 * accompanied this code). 016 * 017 * You should have received a copy of the GNU General Public License version 018 * 2 along with this work; if not, write to the Free Software Foundation, 019 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 020 * 021 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 022 * or visit www.oracle.com if you need additional information or have any 023 * questions. 024 */ 025 026package javafx.beans.value; 027 028/** 029 * A {@code ChangeListener} is notified whenever the value of an 030 * {@link ObservableValue} changes. It can be registered and unregistered with 031 * {@link ObservableValue#addListener(ChangeListener)} respectively 032 * {@link ObservableValue#removeListener(ChangeListener)} 033 * <p> 034 * For an in-depth explanation of change events and how they differ from 035 * invalidation events, see the documentation of {@code ObservableValue}. 036 * <p> 037 * The same instance of {@code ChangeListener} can be registered to listen to 038 * multiple {@code ObservableValues}. 039 * 040 * @see ObservableValue 041 * 042 * 043 */ 044public interface ChangeListener<T> { 045 046 /** 047 * This method needs to be provided by an implementation of 048 * {@code ChangeListener}. It is called if the value of an 049 * {@link ObservableValue} changes. 050 * <p> 051 * In general is is considered bad practice to modify the observed value in 052 * this method. 053 * 054 * @param observable 055 * The {@code ObservableValue} which value changed 056 * @param oldValue 057 * The old value 058 * @param newValue 059 * The new value 060 */ 061 void changed(ObservableValue<? extends T> observable, T oldValue, T newValue); 062}