public void paintIcon(Component c, Graphics g, int x, int y) {
      Color color = c == null ? Color.GRAY : c.getBackground();
      // In a compound sort, make each succesive triangle 20%
      // smaller than the previous one.
      int dx = (int) (size / 2 * Math.pow(0.8, priority));
      int dy = descending ? dx : -dx;
      // Align icon (roughly) with font baseline.
      y = y + 5 * size / 6 + (descending ? -dy : 0);
      int shift = descending ? 1 : -1;
      g.translate(x, y);

      // Right diagonal.
      g.setColor(color.darker());
      g.drawLine(dx / 2, dy, 0, 0);
      g.drawLine(dx / 2, dy + shift, 0, shift);

      // Left diagonal.
      g.setColor(color.brighter());
      g.drawLine(dx / 2, dy, dx, 0);
      g.drawLine(dx / 2, dy + shift, dx, shift);

      // Horizontal line.
      if (descending) {
        g.setColor(color.darker().darker());
      } else {
        g.setColor(color.brighter().brighter());
      }
      g.drawLine(dx, 0, 0, 0);

      g.setColor(color);
      g.translate(-x, -y);
    }
示例#2
0
 // Overridden for performance reasons. ---->
 @Override
 public boolean isOpaque() {
   Color back = getBackground();
   Component p = getParent();
   if (Objects.nonNull(p)) {
     p = p.getParent();
   } // p should now be the JTable.
   boolean colorMatch =
       Objects.nonNull(back)
           && Objects.nonNull(p)
           && back.equals(p.getBackground())
           && p.isOpaque();
   return !colorMatch && super.isOpaque();
 }