Re: JScrollPane content s

Remember that if you add a component to a ScrollPane constructor that
component is the ViewPort and will follow the rules of the
ScrollPaneLayout. It appears to be very similar the the center of a
BorderLayout in action.

I wrote a little test program that shows the size of a JPanel in a
JScrollPane. The JScrollPane only shows vertical scroll bars, never
horizontal. The JScrollPaneLayout will allow the JPanel to expand
larger than its preferred or maximum size (just as BorderLayout would).
It can never be smaller than the minimum width but if the JScrollPane
has been resized smaller than that minimum size some of the JPanel is
not visible.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class test5 extends JPanel {
     public test5() {
     }

     public void paintComponent(Graphics g) {
         g.setColor(getBackground());
         g.fillRect(0,0,getWidth(),getHeight());
         g.setColor(Color.WHITE);
         g.drawString("Width: " + Integer.toString(getWidth()),10,20);
         g.drawString("Height: " + Integer.toString(getHeight()),10,40);
     }

     public static void main(String[] args) {
         EventQueue.invokeLater(new Runnable() {
             public void run() {
                 JFrame f = new JFrame();
                 f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

                 test5 p = new test5();
                 p.setBackground(Color.RED);
                 p.setMinimumSize(new Dimension(100,75));
                 p.setPreferredSize(new Dimension(200,150));
                 p.setMaximumSize(new Dimension(400,300));

                 JScrollPane sp = new JScrollPane(p,
                  JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
                  JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);

                 f.add(sp);

                 f.pack();
                 f.setVisible(true);
             }
         });
     }

}