Swing/ListCellAnimation のバックアップ(No.5)

class AnimeListCellRenderer extends JPanel implements ListCellRenderer {
  private static final Color selectedColor = new Color(230,230,255);
  private final AnimeIcon icon = new AnimeIcon();
  private final MarqueeLabel label = new MarqueeLabel();
  private final javax.swing.Timer animator;
  private final JList list;
  private boolean isRunning = false;
  public AnimeListCellRenderer(final JList l) {
    super(new BorderLayout());
    this.list = l;
    animator = new Timer(80, new ActionListener() {
      @Override public void actionPerformed(ActionEvent e) {
        int i = l.getSelectedIndex();
        if(isRunning=(i>=0)) l.repaint(l.getCellBounds(i,i));
      }
    });
    setOpaque(true);
    add(icon,  BorderLayout.WEST);
    add(label);
    animator.start();
  }
  @Override public Component getListCellRendererComponent(JList list, Object object,
            int index, boolean isSelected, boolean cellHasFocus) {
    setBackground(isSelected ? selectedColor : list.getBackground());
    label.setText((object==null) ? "" : object.toString());
    animate_index = index;
    return this;
  }
  private boolean isAnimatingCell() {
    return isRunning && animate_index==list.getSelectedIndex();
  }
  int animate_index = -1;
  private class MarqueeLabel extends JLabel {
  //...