!7

p-substance {
  JPanel panel = customLayoutPanel(func(Container parent) -> Dimension {
    Dimension size = parent.getSize();
    int y = 10;
    for (Component c : parent.getComponents()) {
      int h = c.getPreferredSize().height;
      c.setBounds(10, y, size.width-20, h);
      y += h + 10;
    }
    ret componentsBoundingSize(parent, 10);
  });
  
  for i to 10: panel.add(jtextfield());
  showFrame(panel);
}