1 /* 2 * Copyright (c) 2012, 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 com.sun.javafx.scene.control; 27 28 import java.util.HashMap; 29 import java.util.Map; 30 import javafx.beans.value.ChangeListener; 31 import javafx.beans.value.ObservableValue; 32 import javafx.beans.value.WeakChangeListener; 33 import javafx.util.Callback; 34 35 public final class MultiplePropertyChangeListenerHandler { 36 37 private final Callback<String, Void> propertyChangedHandler; 38 39 public MultiplePropertyChangeListenerHandler(Callback<String, Void> propertyChangedHandler) { 40 this.propertyChangedHandler = propertyChangedHandler; 41 } 42 43 /** 44 * This is part of the workaround introduced during delomboking. We probably will 45 * want to adjust the way listeners are added rather than continuing to use this 46 * map (although it doesn't really do much harm). 47 */ 48 private Map<ObservableValue<?>,String> propertyReferenceMap = 49 new HashMap<ObservableValue<?>,String>(); 50 51 private final ChangeListener<Object> propertyChangedListener = new ChangeListener<Object>() { 52 @Override public void changed(ObservableValue<?> property, 53 @SuppressWarnings("unused") Object oldValue, 54 @SuppressWarnings("unused") Object newValue) { 55 propertyChangedHandler.call(propertyReferenceMap.get(property)); 56 } 57 }; 58 59 private final WeakChangeListener<Object> weakPropertyChangedListener = 60 new WeakChangeListener<Object>(propertyChangedListener); 61 62 /** 63 * Subclasses can invoke this method to register that we want to listen to 64 * property change events for the given property. 65 * 66 * @param property 67 * @param reference 68 */ 69 public final void registerChangeListener(ObservableValue<?> property, String reference) { 70 if (!propertyReferenceMap.containsKey(property)) { 71 propertyReferenceMap.put(property, reference); 72 property.addListener(weakPropertyChangedListener); 73 } 74 } 75 76 public final void unregisterChangeListener(ObservableValue<?> property) { 77 if (propertyReferenceMap.containsKey(property)) { 78 propertyReferenceMap.remove(property); 79 property.removeListener(weakPropertyChangedListener); 80 } 81 } 82 83 public void dispose() { 84 // unhook listeners 85 for (ObservableValue<?> value : propertyReferenceMap.keySet()) { 86 value.removeListener(weakPropertyChangedListener); 87 } 88 propertyReferenceMap.clear(); 89 } 90 }