Swing/FocusTraversal のバックアップの現在との差分(No.22)

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final JButton nb = new JButton("NORTH");
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final JButton sb = new JButton("SOUTH");
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final JButton wb = new JButton("WEST");
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final JButton eb = new JButton("EAST");
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JButton nb = new JButton("NORTH");
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JButton sb = new JButton("SOUTH");
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JButton wb = new JButton("WEST");
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JButton eb = new JButton("EAST");
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add(new JScrollPane(textarea));
add(nb, BorderLayout.NORTH);
add(sb, BorderLayout.SOUTH);
add(wb, BorderLayout.WEST);
add(eb, BorderLayout.EAST);
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FocusTraversalPolicy policy = new FocusTraversalPolicy() {
  //private final List<Component> order = Arrays.asList(
  //    new Component[] {eb, wb, sb, nb});
  private final List<? extends Component> order = Arrays.asList(eb, wb, sb, nb);
  @Override public Component getFirstComponent(Container focusCycleRoot) {
    return order.get(0);
  }
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  @Override public Component getLastComponent(Container focusCycleRoot) {
    return order.get(order.size() - 1);
  }
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  @Override public Component getComponentAfter(
      Container focusCycleRoot, Component aComponent) {
    int i = order.indexOf(aComponent);
    return order.get((i + 1) % order.size());
  }
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  @Override public Component getComponentBefore(
      Container focusCycleRoot, Component aComponent) {
    int i = order.indexOf(aComponent);
    return order.get((i - 1 + order.size()) % order.size());
  }
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  @Override public Component getDefaultComponent(Container focusCycleRoot) {
    return order.get(0);
  }
};
frame.setFocusTraversalPolicy(policy);
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//setFocusTraversalPolicyProvider(true);
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//setFocusTraversalPolicy(policy);
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// setFocusTraversalPolicyProvider(true);
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// setFocusTraversalPolicy(policy);
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