!7

abstract sclass AbstractLayoutManager implements LayoutManager {

  Dimension preferredSize = new Dimension(100, 100);

  bool invalidate;

  public void addLayoutComponent(String name, Component comp) {

    print("addLayoutComponent called");

  }

  public void removeLayoutComponent(Component comp) {

    print("removeLayoutComponent called");

  }

  public Dimension preferredLayoutSize(Container parent) {

    print("preferredLayoutSize called (" + invalidate + ")");

    layoutContainer(parent);

    //validate(parent);

    ret preferredSize;

  }

  public Dimension minimumLayoutSize(Container parent) {

    print("minimumLayoutSize called");

    ret new Dimension(10, 10);

  }

  void validate(Container parent) {

    if (invalidate) {

      invalidate = false;

      layoutContainer(parent);

    }

  }

}

p-substance {

  JPanel panel = new JPanel(new AbstractLayoutManager {

    public void layoutContainer(Container parent) {

      Dimension size = parent.getSize();

      print("layoutContainer called, size=" + size);

      int y = 10;

      for (Component c : parent.getComponents()) {

        int h = c.getPreferredSize().height;

        c.setBounds(10, y, size.width-20, h);

        y += h + 10;

      }

      preferredSize = componentsBoundingSize(parent, 10);

    }

  });

  for i to 10:

    panel.add(jtextfield());

  print("components added");

  showFrame(panel);

}