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| 1 | +/* | |
| 2 | + * Copyright (c) 1997, 2008, 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 | +package javax.swing; | |
| 26 | + | |
| 27 | +import java.awt.Component; | |
| 28 | +import java.awt.Container; | |
| 29 | +import java.awt.FocusTraversalPolicy; | |
| 30 | +import java.util.Comparator; | |
| 31 | + | |
| 32 | + | |
| 33 | +/** | |
| 34 | + * This class has been obsoleted by the 1.4 focus APIs. While client code may | |
| 35 | + * still use this class, developers are strongly encouraged to use | |
| 36 | + * <code>java.awt.KeyboardFocusManager</code> and | |
| 37 | + * <code>java.awt.DefaultKeyboardFocusManager</code> instead. | |
| 38 | + * <p> | |
| 39 | + * Please see | |
| 40 | + * <a href="http://java.sun.com/docs/books/tutorial/uiswing/misc/focus.html"> | |
| 41 | + * How to Use the Focus Subsystem</a>, | |
| 42 | + * a section in <em>The Java Tutorial</em>, and the | |
| 43 | + * <a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a> | |
| 44 | + * for more information. | |
| 45 | + * | |
| 46 | + * @author Arnaud Weber | |
| 47 | + * @author David Mendenhall | |
| 48 | + */ | |
| 49 | +public class DefaultFocusManager extends FocusManager { | |
| 50 | + | |
| 51 | + final FocusTraversalPolicy gluePolicy = | |
| 52 | + new LegacyGlueFocusTraversalPolicy(this); | |
| 53 | + private final FocusTraversalPolicy layoutPolicy = | |
| 54 | + new LegacyLayoutFocusTraversalPolicy(this); | |
| 55 | + private final LayoutComparator comparator = | |
| 56 | + new LayoutComparator(); | |
| 57 | + | |
| 58 | + public DefaultFocusManager() { | |
| 59 | + setDefaultFocusTraversalPolicy(gluePolicy); | |
| 60 | + } | |
| 61 | + | |
| 62 | + public Component getComponentAfter(Container aContainer, | |
| 63 | + Component aComponent) | |
| 64 | + { | |
| 65 | + Container root = (aContainer.isFocusCycleRoot()) | |
| 66 | + ? aContainer | |
| 67 | + : aContainer.getFocusCycleRootAncestor(); | |
| 68 | + | |
| 69 | + // Support for mixed 1.4/pre-1.4 focus APIs. If a particular root's | |
| 70 | + // traversal policy is non-legacy, then honor it. | |
| 71 | + if (root != null) { | |
| 72 | + FocusTraversalPolicy policy = root.getFocusTraversalPolicy(); | |
| 73 | + if (policy != gluePolicy) { | |
| 74 | + return policy.getComponentAfter(root, aComponent); | |
| 75 | + } | |
| 76 | + | |
| 77 | + comparator.setComponentOrientation(root.getComponentOrientation()); | |
| 78 | + return layoutPolicy.getComponentAfter(root, aComponent); | |
| 79 | + } | |
| 80 | + | |
| 81 | + return null; | |
| 82 | + } | |
| 83 | + | |
| 84 | + public Component getComponentBefore(Container aContainer, | |
| 85 | + Component aComponent) | |
| 86 | + { | |
| 87 | + Container root = (aContainer.isFocusCycleRoot()) | |
| 88 | + ? aContainer | |
| 89 | + : aContainer.getFocusCycleRootAncestor(); | |
| 90 | + | |
| 91 | + // Support for mixed 1.4/pre-1.4 focus APIs. If a particular root's | |
| 92 | + // traversal policy is non-legacy, then honor it. | |
| 93 | + if (root != null) { | |
| 94 | + FocusTraversalPolicy policy = root.getFocusTraversalPolicy(); | |
| 95 | + if (policy != gluePolicy) { | |
| 96 | + return policy.getComponentBefore(root, aComponent); | |
| 97 | + } | |
| 98 | + | |
| 99 | + comparator.setComponentOrientation(root.getComponentOrientation()); | |
| 100 | + return layoutPolicy.getComponentBefore(root, aComponent); | |
| 101 | + } | |
| 102 | + | |
| 103 | + return null; | |
| 104 | + } | |
| 105 | + | |
| 106 | + public Component getFirstComponent(Container aContainer) { | |
| 107 | + Container root = (aContainer.isFocusCycleRoot()) | |
| 108 | + ? aContainer | |
| 109 | + : aContainer.getFocusCycleRootAncestor(); | |
| 110 | + | |
| 111 | + // Support for mixed 1.4/pre-1.4 focus APIs. If a particular root's | |
| 112 | + // traversal policy is non-legacy, then honor it. | |
| 113 | + if (root != null) { | |
| 114 | + FocusTraversalPolicy policy = root.getFocusTraversalPolicy(); | |
| 115 | + if (policy != gluePolicy) { | |
| 116 | + return policy.getFirstComponent(root); | |
| 117 | + } | |
| 118 | + | |
| 119 | + comparator.setComponentOrientation(root.getComponentOrientation()); | |
| 120 | + return layoutPolicy.getFirstComponent(root); | |
| 121 | + } | |
| 122 | + | |
| 123 | + return null; | |
| 124 | + } | |
| 125 | + | |
| 126 | + public Component getLastComponent(Container aContainer) { | |
| 127 | + Container root = (aContainer.isFocusCycleRoot()) | |
| 128 | + ? aContainer | |
| 129 | + : aContainer.getFocusCycleRootAncestor(); | |
| 130 | + | |
| 131 | + // Support for mixed 1.4/pre-1.4 focus APIs. If a particular root's | |
| 132 | + // traversal policy is non-legacy, then honor it. | |
| 133 | + if (root != null) { | |
| 134 | + FocusTraversalPolicy policy = root.getFocusTraversalPolicy(); | |
| 135 | + if (policy != gluePolicy) { | |
| 136 | + return policy.getLastComponent(root); | |
| 137 | + } | |
| 138 | + | |
| 139 | + comparator.setComponentOrientation(root.getComponentOrientation()); | |
| 140 | + return layoutPolicy.getLastComponent(root); | |
| 141 | + } | |
| 142 | + | |
| 143 | + return null; | |
| 144 | + } | |
| 145 | + | |
| 146 | + public boolean compareTabOrder(Component a, Component b) { | |
| 147 | + return (comparator.compare(a, b) < 0); | |
| 148 | + } | |
| 149 | +} | |
| 150 | + | |
| 151 | +final class LegacyLayoutFocusTraversalPolicy | |
| 152 | + extends LayoutFocusTraversalPolicy | |
| 153 | +{ | |
| 154 | + LegacyLayoutFocusTraversalPolicy(DefaultFocusManager defaultFocusManager) { | |
| 155 | + super(new CompareTabOrderComparator(defaultFocusManager)); | |
| 156 | + } | |
| 157 | +} | |
| 158 | + | |
| 159 | +final class CompareTabOrderComparator implements Comparator<Component> { | |
| 160 | + private final DefaultFocusManager defaultFocusManager; | |
| 161 | + | |
| 162 | + CompareTabOrderComparator(DefaultFocusManager defaultFocusManager) { | |
| 163 | + this.defaultFocusManager = defaultFocusManager; | |
| 164 | + } | |
| 165 | + | |
| 166 | + public int compare(Component o1, Component o2) { | |
| 167 | + if (o1 == o2) { | |
| 168 | + return 0; | |
| 169 | + } | |
| 170 | + return (defaultFocusManager.compareTabOrder(o1, o2)) ? -1 : 1; | |
| 171 | + } | |
| 172 | +} | |