Swing/ClippedLRComboBox のバックアップの現在との差分(No.10)

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class MultiColumnCellRenderer extends JPanel implements ListCellRenderer {
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  private final JLabel leftLabel = new JLabel();
  private final JLabel rightLabel;

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  public MultiColumnCellRenderer(int rightWidth) {
    super(new BorderLayout());
    this.setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 1));

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    leftLabel.setOpaque(false);
    leftLabel.setBorder(BorderFactory.createEmptyBorder(0, 2, 0, 0));

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**サンプルコード [#n26d00a1]
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class MyCellRenderer extends JPanel implements ListCellRenderer {
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  private final JLabel lbl1 = new JLabel();
  private final JLabel lbl2 = new JLabel();
  private final Color  cfc  = UIManager.getColor("ComboBox.foreground");
  private final Color  cbc  = UIManager.getColor("ComboBox.background");
  private final Color  csfc = UIManager.getColor("ComboBox.selectionForeground");
  private final Color  csbc = UIManager.getColor("ComboBox.selectionBackground");
  private final Color  cdfc = UIManager.getColor("ComboBox.disabledForeground");
  public MyCellRenderer(Dimension dim, int rightw) {
    super(new BorderLayout());
    lbl1.setOpaque(true);
    lbl2.setOpaque(true);
    this.setOpaque(true);
    lbl1.setBorder(BorderFactory.createEmptyBorder(0,2,0,0));
    lbl2.setPreferredSize(new Dimension(rightw, 0));
    lbl2.setBorder(BorderFactory.createEmptyBorder(0,5,0,0));
    this.add(lbl1);
    this.add(lbl2, BorderLayout.EAST);
    this.setPreferredSize(dim);
    final Dimension dim = new Dimension(rightWidth, 0);
    rightLabel = new JLabel() {
      @Override public Dimension getPreferredSize() {
        return dim;
      }
    };
    rightLabel.setOpaque(false);
    rightLabel.setBorder(BorderFactory.createEmptyBorder(0, 2, 0, 2));
    rightLabel.setForeground(Color.GRAY);
    rightLabel.setHorizontalAlignment(SwingConstants.RIGHT);
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    this.add(leftLabel);
    this.add(rightLabel, BorderLayout.EAST);
  }
  public Component getListCellRendererComponent(
                    JList list, Object value, int index,
                    boolean isSelected, boolean cellHasFocus) {
    LRItem item = (LRItem)value;
    lbl1.setText(item.getLeftText());
    lbl2.setText(item.getRightText());
    lbl1.setBackground(isSelected ? csbc : cbc);
    lbl2.setBackground(isSelected ? csbc : cbc);
    this.setBackground(isSelected ? csbc : cbc);
    lbl1.setForeground(isSelected ? csfc : cfc);
    lbl2.setForeground(cdfc);
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  @Override public Component getListCellRendererComponent(
      JList list, Object value, int index,
      boolean isSelected, boolean cellHasFocus) {
    LRItem item = (LRItem) value;
    leftLabel.setText(item.getLeftText());
    rightLabel.setText(item.getRightText());
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    leftLabel.setFont(list.getFont());
    rightLabel.setFont(list.getFont());
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    if (index < 0) {
      leftLabel.setForeground(list.getForeground());
      this.setOpaque(false);
    } else {
      leftLabel.setForeground(
          isSelected ? list.getSelectionForeground() : list.getForeground());
      this.setBackground(
          isSelected ? list.getSelectionBackground() : list.getBackground());
      this.setOpaque(true);
    }
    return this;
  }
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  @Override public Dimension getPreferredSize() {
    Dimension d = super.getPreferredSize();
    return new Dimension(0, d.height);
  }
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  @Override public void updateUI() {
    super.updateUI();
    this.setName("List.cellRenderer");
  }
}