public Dimension getDimension(Container target, int maxWidth) {
    Insets insets = target.getInsets();
    int height = insets.top + insets.bottom;
    int width = insets.left + insets.right;

    int rowHeight = 0;
    int rowWidth = insets.left + insets.right;

    boolean isVisible = false;
    boolean start = true;

    synchronized (target.getTreeLock()) {
      for (int i = 0; i < target.getComponentCount(); i++) {
        Component component = target.getComponent(i);
        if (component.isVisible()) {
          isVisible = true;
          Dimension size = component.getPreferredSize();

          if (rowWidth + getHgap() + size.width > maxWidth && !start) {
            height += getVgap() + rowHeight;
            width = Math.max(width, rowWidth);

            rowWidth = insets.left + insets.right;
            rowHeight = 0;
          }

          rowWidth += getHgap() + size.width;
          rowHeight = Math.max(rowHeight, size.height);

          start = false;
        }
      }
      height += getVgap() + rowHeight;
      width = Math.max(width, rowWidth);

      if (!isVisible) {
        return super.preferredLayoutSize(target);
      }
      else {
        return new Dimension(width, height);
      }
    }
  }
public Dimension getDimension(Container target, int maxWidth)