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

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class TabThumbnailTabbedPane extends JTabbedPane {
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  private int current = -1;
  private static final double SCALE = .15;
  private Component getTabThumbnail(int index) {
    Component c = getComponentAt(index);
    Icon icon = null;
    if (c instanceof JScrollPane) {
      c = ((JScrollPane) c).getViewport().getView();
      Dimension d = c.getPreferredSize();
      int newW = (int) (d.width  * SCALE);
      int newH = (int) (d.height * SCALE);
      BufferedImage image = new BufferedImage(
          newW, newH, BufferedImage.TYPE_INT_ARGB);
      Graphics2D g2 = image.createGraphics();
      g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
                          RenderingHints.VALUE_INTERPOLATION_BILINEAR);
      g2.scale(SCALE, SCALE);
      c.paint(g2);
      g2.dispose();
      icon = new ImageIcon(image);
    } else if (c instanceof JLabel) {
      icon = ((JLabel) c).getIcon();
    }
    return new JLabel(icon);
  }

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  @Override public JToolTip createToolTip() {
    int index = current;
    if (index < 0) {
      return null;
    }

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**サンプルコード [#o54faaa7]
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#code{{
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 class MyTabbedPane extends JTabbedPane {
   private final JToolTip tip;
   private int current = -1;
   public MyTabbedPane() {
     super();
     tip = super.createToolTip();
   }
   public JToolTip createToolTip() {
     initToolTip(tip, current);
     return tip;
   }
   public String getToolTipText(MouseEvent e) {
     int index = indexAtLocation(e.getX(), e.getY());
     String str = (current!=index)?null:super.getToolTipText(e);
     current = index;
     return str;
   }
   private final double scale = 0.2d;
   private void initToolTip(JToolTip tip, int index) {
     tip.removeAll();
     JPanel panel = new JPanel(new BorderLayout());
     if(index<0) {
       return;
     }
     String str = getTitleAt(index);
     panel.add(new JLabel(str), BorderLayout.NORTH);
     Component c = getComponentAt(index);
     if(c instanceof JScrollPane) {
       c = ((JScrollPane)c).getViewport().getView();
     }
     final BufferedImage image = new BufferedImage(
       c.getWidth(), c.getHeight(), BufferedImage.TYPE_INT_ARGB);
     Graphics g = image.getGraphics();
     c.paint(g);
     JPanel pnl = new JPanel() {
       public void paintComponent(Graphics g) {
         Graphics2D g2 = (Graphics2D) g;
         g2.scale(scale,scale);
         g2.drawImage(image, 0, 0, this);
       }
     };
     pnl.setOpaque(true);
     panel.add(pnl, BorderLayout.CENTER);
     tip.setBorder(BorderFactory.createLineBorder(Color.BLACK));
     tip.setLayout(new BorderLayout());
     tip.add(panel, BorderLayout.CENTER);
     Dimension d = new Dimension(
       (int)(c.getWidth()*scale), (int)(c.getHeight()*scale));
     tip.setPreferredSize(d);
   }
 }
    JPanel p = new JPanel(new BorderLayout());
    p.setBorder(BorderFactory.createEmptyBorder());
    p.add(new JLabel(getTitleAt(index)), BorderLayout.NORTH);
    p.add(getTabThumbnail(index));
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    JToolTip tip = new JToolTip() {
      @Override public Dimension getPreferredSize() {
        Insets i = getInsets();
        Dimension d = p.getPreferredSize();
        return new Dimension(
            d.width + i.left + i.right, d.height + i.top + i.bottom);
      }
    };
    tip.setComponent(this);
    LookAndFeel.installColorsAndFont(
        p, "ToolTip.background", "ToolTip.foreground", "ToolTip.font");
    tip.setLayout(new BorderLayout());
    tip.add(p);
    return tip;
  }
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  @Override public String getToolTipText(MouseEvent e) {
    int index = indexAtLocation(e.getX(), e.getY());
    String str = (current == index) ? super.getToolTipText(e) : null;
    current = index;
    return str;
  }
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}
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