Swing/ClippedLRComboBox のバックアップの現在との差分(No.3)

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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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http://terai.xrea.jp/swing/clippedlrcombobox/screenshot.png
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  public MultiColumnCellRenderer(int rightWidth) {
    super(new BorderLayout());
    this.setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 1));

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**サンプルコード [#n26d00a1]
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 class MyCellRenderer extends JPanel implements ListCellRenderer {
   private final JLabel lbl1 = new JLabel();
   private final JLabel lbl2 = new JLabel();
   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, BorderLayout.CENTER);
     this.add(lbl2, BorderLayout.EAST);
     this.setPreferredSize(dim);
   }
   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 ? SystemColor.textHighlight :
                                     Color.white);
     lbl2.setBackground(isSelected ? SystemColor.textHighlight :
                                     Color.white);
     this.setBackground(isSelected ? SystemColor.textHighlight :
                                     Color.white);
     lbl1.setForeground(isSelected ? Color.white :
                                     Color.black);
     lbl2.setForeground(isSelected ? Color.gray.brighter() :
                                     Color.gray);
     return this;
   }
 }
    leftLabel.setOpaque(false);
    leftLabel.setBorder(BorderFactory.createEmptyBorder(0, 2, 0, 0));

-[[サンプルを起動>http://terai.xrea.jp/swing/clippedlrcombobox/sample.jnlp]]
-[[jarファイル>http://terai.xrea.jp/swing/clippedlrcombobox/sample.jar]]
-[[ソース>http://terai.xrea.jp/swing/clippedlrcombobox/src.zip]]
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**解説 [#y1b479cc]
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上記のサンプルは、[[JComboBoxのItemを左右に配置>Swing/LRComboBox]]と同じように、Itemに設定した文字列を左右に表示しますが、htmlのtableタグは使用せず、JLabelを二つ並べたJPanelをレンダラーとして使用しています。このため文字列が長い場合、JLabelがこれを自動的にクリップして表示します。
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**参考リンク [#w60ad6dd]
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-[[JComboBoxのItemを左右に配置>Swing/LRComboBox]]
    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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**コメント [#n7dbe41e]
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    this.add(leftLabel);
    this.add(rightLabel, BorderLayout.EAST);
  }
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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");
  }
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}
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