1 /* 2 * Copyright (c) 2009, 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 sun.swing; 27 28 import sun.misc.Unsafe; 29 30 import java.awt.Point; 31 32 import javax.swing.text.JTextComponent; 33 import javax.swing.TransferHandler; 34 35 /** 36 * The SwingAccessor utility class. 37 * The main purpose of this class is to enable accessing 38 * private and package-private fields of classes from 39 * different classes/packages. See sun.misc.SharedSecretes 40 * for another example. 41 */ 42 public final class SwingAccessor { 43 private static final Unsafe unsafe = Unsafe.getUnsafe(); 44 45 /** 46 * We don't need any objects of this class. 47 * It's rather a collection of static methods 48 * and interfaces. 49 */ 50 private SwingAccessor() { 51 } 52 53 /** 54 * An accessor for the JTextComponent class. 55 * Note that we intentionally introduce the JTextComponentAccessor, 56 * and not the JComponentAccessor because the needed methods 57 * aren't override methods. 58 */ 59 public interface JTextComponentAccessor { 60 61 /** 62 * Calculates a custom drop location for the text component, 63 * representing where a drop at the given point should insert data. 64 */ 65 TransferHandler.DropLocation dropLocationForPoint(JTextComponent textComp, Point p); 66 67 /** 68 * Called to set or clear the drop location during a DnD operation. 69 */ 70 Object setDropLocation(JTextComponent textComp, TransferHandler.DropLocation location, 71 Object state, boolean forDrop); 72 } 73 74 /** 75 * An accessor for the JLightweightFrame class. 76 */ 77 public interface JLightweightFrameAccessor { 78 /** 79 * Updates the JLightweight frame that it needs to update a cursor 80 */ 81 void updateCursor(JLightweightFrame frame); 82 } 83 84 /** 85 * The javax.swing.text.JTextComponent class accessor object. 86 */ 87 private static JTextComponentAccessor jtextComponentAccessor; 88 89 /** 90 * Set an accessor object for the javax.swing.text.JTextComponent class. 91 */ 92 public static void setJTextComponentAccessor(JTextComponentAccessor jtca) { 93 jtextComponentAccessor = jtca; 94 } 95 96 /** 97 * Retrieve the accessor object for the javax.swing.text.JTextComponent class. 98 */ 99 public static JTextComponentAccessor getJTextComponentAccessor() { 100 if (jtextComponentAccessor == null) { 101 unsafe.ensureClassInitialized(JTextComponent.class); 102 } 103 104 return jtextComponentAccessor; 105 } 106 107 /** 108 * The JLightweightFrame class accessor object 109 */ 110 private static JLightweightFrameAccessor jLightweightFrameAccessor; 111 112 /** 113 * Set an accessor object for the JLightweightFrame class. 114 */ 115 public static void setJLightweightFrameAccessor(JLightweightFrameAccessor accessor) { 116 jLightweightFrameAccessor = accessor; 117 } 118 119 /** 120 * Retrieve the accessor object for the JLightweightFrame class 121 */ 122 public static JLightweightFrameAccessor getJLightweightFrameAccessor() { 123 return jLightweightFrameAccessor; 124 } 125 }