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| 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 | + * The javax.swing.text.JTextComponent class accessor object. | |
| 76 | + */ | |
| 77 | + private static JTextComponentAccessor jtextComponentAccessor; | |
| 78 | + | |
| 79 | + /** | |
| 80 | + * Set an accessor object for the javax.swing.text.JTextComponent class. | |
| 81 | + */ | |
| 82 | + public static void setJTextComponentAccessor(JTextComponentAccessor jtca) { | |
| 83 | + jtextComponentAccessor = jtca; | |
| 84 | + } | |
| 85 | + | |
| 86 | + /** | |
| 87 | + * Retrieve the accessor object for the javax.swing.text.JTextComponent class. | |
| 88 | + */ | |
| 89 | + public static JTextComponentAccessor getJTextComponentAccessor() { | |
| 90 | + if (jtextComponentAccessor == null) { | |
| 91 | + unsafe.ensureClassInitialized(JTextComponent.class); | |
| 92 | + } | |
| 93 | + | |
| 94 | + return jtextComponentAccessor; | |
| 95 | + } | |
| 96 | +} | |