Swing/LineFocusTable のバックアップ(No.10)

class DotBorder extends EmptyBorder {
  public enum Type { START, END; }
  private static final BasicStroke dashed = new BasicStroke(
    1.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER,
    10.0f, (new float[] {1.0f}), 0.0f);
  private static final Color dotColor = new Color(200,150,150);
  public DotBorder(int top, int left, int bottom, int right) {
    super(top, left, bottom, right);
  }
  public EnumSet<Type> type = EnumSet.noneOf(Type.class);
  @Override public boolean isBorderOpaque() {
    return true;
  }
  @Override public void paintBorder(
        Component c, Graphics g, int x, int y, int w, int h) {
    Graphics2D g2 = (Graphics2D) g;
    g2.translate(x,y);
    g2.setPaint(dotColor);
    g2.setStroke(dashed);
    if(type.contains(Type.START)) {
      g2.drawLine(0,0,0,h);
    }
    if(type.contains(Type.END)) {
      g2.drawLine(w-1,0,w-1,h);
    }
    if(c.getBounds().x%2==0) {
      g2.drawLine(0,0,w,0);
      g2.drawLine(0,h-1,w,h-1);
    }else{
      g2.drawLine(1,0,w,0);
      g2.drawLine(1,h-1,w,h-1);
    }
    g2.translate(-x,-y);
  }
}