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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   }

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