// Author: Graham Freeman. July 2008
// Copyright (c) Graham Freeman.  g-freeman@adfa.edu.au
// The author accepts no responsibility for any problems caused by use of 
// this software.  It is supplied free of charge, and usage is unrestricted, 
// provided this copyright notice remains intact, regardless of how the 
// software may be modified by other people.  

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

/** This class demonstrates some of the features of SpringLayout and how
    it handles a JScrollPane which gains or loses scrollbars. */

public class TestSpringLayout extends JFrame implements ActionListener
{
   JButton reject, accept, quit;
   JTextArea addr;
   JScrollPane jsp;
   
   public static void main( String[] arg )
   {
      new TestSpringLayout().setVisible(true);
   }

   public TestSpringLayout()
   {
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      Container cpane = getContentPane();
      SpringLayout form = new SpringLayout();
      cpane.setLayout(form);

      JLabel lab1 = new JLabel("Name: ") ;
      form.putConstraint( form.NORTH, lab1, 3, form.NORTH, cpane );
      form.putConstraint( form.WEST, lab1, 4, form.WEST, cpane );
      cpane.add(lab1);
      JLabel lab2 = new JLabel("Address: ");

      JTextField name = new JTextField(" ",50);
      form.putConstraint( form.NORTH, name, 3, form.NORTH, cpane );
      form.putConstraint( form.WEST, name, 3, form.EAST, lab2 );
      cpane.add(name);

      form.putConstraint( form.NORTH, lab2, 3, form.SOUTH, name );
      form.putConstraint( form.WEST, lab2, 4, form.WEST, cpane );
      cpane.add(lab2);
      
      addr = new JTextArea(" ",3,50 );
      jsp = new JScrollPane( addr, 
               JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, 
               JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED );
      form.putConstraint( form.NORTH, jsp, 3, form.SOUTH, name );
      form.putConstraint( form.WEST, jsp, 0, form.WEST, name );
      form.putConstraint( form.EAST, cpane, 4, form.EAST, jsp );
      cpane.add(jsp);

      JLabel lab4 = new JLabel("Adult ");
      form.putConstraint( form.NORTH, lab4, 3, form.SOUTH, jsp );
      form.putConstraint( form.WEST, lab4, 0, form.WEST, name );
      cpane.add(lab4);

      JTextField adults = new JTextField(" ",3);
      form.putConstraint( form.NORTH, adults, 3, form.SOUTH, jsp );
      form.putConstraint( form.WEST, adults, 3, form.EAST, lab4 );
      cpane.add(adults);

      JLabel Ch = new JLabel("Child");
      form.putConstraint( form.NORTH, Ch, 3, form.SOUTH, jsp );
      form.putConstraint( form.WEST, Ch, 16, form.EAST, adults );
      cpane.add(Ch);

      JTextField children = new JTextField(" ",3);
      form.putConstraint( form.NORTH, children, 3, form.SOUTH, jsp );
      form.putConstraint( form.WEST, children, 3, form.EAST, Ch );
      cpane.add(children);

      JLabel Con = new JLabel("Concession");
      form.putConstraint( form.NORTH, Con, 3, form.SOUTH, jsp );
      form.putConstraint( form.WEST, Con, 16, form.EAST, children );
      cpane.add(Con);

      JTextField concess = new JTextField(" ",3);
      form.putConstraint( form.NORTH, concess, 3, form.SOUTH, jsp );
      form.putConstraint( form.WEST, concess, 3, form.EAST, Con );
      cpane.add(concess);

      accept = new JButton("Accept");
      form.putConstraint( form.NORTH, accept, 3, form.SOUTH, adults );
      form.putConstraint( form.WEST, accept, 16, form.WEST, cpane );
      cpane.add(accept);
      reject = new JButton("Reject");
      form.putConstraint( form.NORTH, reject, 3, form.SOUTH, adults );
      form.putConstraint( form.HORIZONTAL_CENTER, reject, 0, form.HORIZONTAL_CENTER, cpane );
      cpane.add(reject);
      accept.addActionListener( this );
      reject.addActionListener( this );

      quit = new JButton("Exit");
      form.putConstraint( form.NORTH, quit, 3, form.SOUTH, adults );
      form.putConstraint( form.EAST, quit, -16, form.EAST, cpane );
      form.putConstraint( form.SOUTH, cpane, 5, form.SOUTH, quit );
      cpane.add(quit);
      quit.addActionListener( this );
      pack();
   }
   public void actionPerformed( ActionEvent e )
   {
      Object source = e.getSource();
      if (source == reject)
      {
         System.out.println("\nReject");
         jsp.setVisible(false);
         pack();
      }
      else if (source == accept)
      {
         System.out.println("\nAccept");
         addr.setText("First a very long line of text that should force a "
              +"horizontal scroll bar.  We need a fair bit of text; the font"
              +"is surprisingly narrow.\n");
         pack();
      }
      else if (source == quit)
      {
         System.out.println("\nQuit");
         jsp.setVisible(true);
         addr.append("and\nthen\nseveral\nlines\nto force\na "
              +"vertical\nscrollbar\n");
         pack();
      }
   }
}