JToolBarのドラッグアイコンを変更する

class ToolBarDragBorder extends MetalBorders.ToolBarBorder {
  private static final Icon DRAG_ICON = new ToolBarDragIcon();

  @Override public void paintBorder(Component c, Graphics g, int x, int y, int w, int h) {
    if (!(c instanceof JToolBar)) {
      return;
    }
    JToolBar tb = (JToolBar) c;
    if (tb.isFloatable()) {
      if (tb.getOrientation() == HORIZONTAL) {
        int cy = (h - DRAG_ICON.getIconHeight()) / 2;
        DRAG_ICON.paintIcon(c, g, x, y + cy);
      } else { // vertical
        super.paintBorder(c, g, x, y, w, h);
      }
    }
  }
}

class ToolBarDragIcon implements Icon {
  @Override public void paintIcon(Component c, Graphics g, int x, int y) {
    Graphics2D g2 = (Graphics2D) g.create();
    g2.translate(x, y);
    g2.setPaint(Color.GRAY);
    int x2 = getIconWidth() / 2 - 1;
    int y2 = getIconHeight() / 2 - 1;
    g2.fillRect(x2, y2 - 6, 2, 2);
    g2.fillRect(x2, y2 - 2, 2, 2);
    g2.fillRect(x2, y2 + 2, 2, 2);
    g2.fillRect(x2, y2 + 6, 2, 2);
    g2.dispose();
  }

  @Override public int getIconWidth() {
    return 14;
  }

  @Override public int getIconHeight() {
    return 16;
  }
}