1 /* 2 * Copyright (c) 2005, 2015, 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.java.accessibility.util; 27 28 import java.awt.*; 29 import java.util.EventListener; 30 import javax.accessibility.*; 31 32 33 /** 34 * The TopLevelWindowMulticaster class is used to maintain a list of 35 * TopLevelWindowListener classes. It is intended to be used primarily 36 * for internal support in the EventQueueMonitor class, and is not intended 37 * to be used by classes outside the Java Accessibility Utility package. 38 * 39 * @see EventQueueMonitor 40 * @see EventQueueMonitor#addTopLevelWindowListener 41 * @see EventQueueMonitor#removeTopLevelWindowListener 42 * 43 */ 44 @jdk.Exported(false) 45 public class TopLevelWindowMulticaster 46 extends AWTEventMulticaster implements TopLevelWindowListener 47 { 48 protected TopLevelWindowMulticaster(EventListener a, EventListener b) { 49 super(a, b); 50 } 51 52 public void topLevelWindowCreated(Window w) { 53 ((TopLevelWindowListener)a).topLevelWindowCreated(w); 54 ((TopLevelWindowListener)b).topLevelWindowCreated(w); 55 } 56 57 public void topLevelWindowDestroyed(Window w) { 58 ((TopLevelWindowListener)a).topLevelWindowDestroyed(w); 59 ((TopLevelWindowListener)b).topLevelWindowDestroyed(w); 60 } 61 62 public static TopLevelWindowListener add(TopLevelWindowListener a, TopLevelWindowListener b) { 63 return (TopLevelWindowListener)addInternal(a, b); 64 } 65 66 public static TopLevelWindowListener remove(TopLevelWindowListener l, TopLevelWindowListener oldl) { 67 return (TopLevelWindowListener)removeInternal(l, oldl); 68 } 69 70 protected static EventListener addInternal(EventListener a, EventListener b) { 71 if (a == null) return b; 72 if (b == null) return a; 73 return new TopLevelWindowMulticaster(a, b); 74 } 75 76 protected static EventListener removeInternal(EventListener l, EventListener oldl) { 77 if (l == oldl || l == null) { 78 return null; 79 } else if (l instanceof TopLevelWindowMulticaster) { 80 return ((TopLevelWindowMulticaster)l).remove(oldl); 81 } else { 82 return l; // it's not here 83 } 84 } 85 86 }