// 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 GridBagLayout.java and how
    it handles a JScrollPane which gains or loses scrollbars. */

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

   public TestGBLayout()
   {
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      Container cpane = getContentPane();
      GridBagLayout gbag = new GridBagLayout();
      cpane.setLayout( gbag );
      GridBagConstraints gbc = new GridBagConstraints();
      gbc.weightx = 1.0;
      gbc.weighty = 1.0;
      gbc.ipadx = 7;
      gbc.ipady = 7;
      gbc.insets = new Insets(3,3,3,3);
      GridBagConstraints gbclast = (GridBagConstraints) gbc.clone();
      gbclast.gridwidth = gbc.REMAINDER;
      GridBagConstraints gbceast = (GridBagConstraints) gbc.clone();
      gbceast.anchor = gbc.EAST;
      gbceast.fill = gbc.NONE;

      JLabel lab1 = new JLabel("Name: ") ;
      gbag.setConstraints( lab1, gbc );
      cpane.add( lab1 );
      JLabel lab2 = new JLabel("Address: ");

      JTextField name = new JTextField(" ",50);
      gbag.setConstraints( name, gbclast );
      cpane.add( name );
      gbag.setConstraints( lab2, gbc );
      cpane.add( lab2 );

      addr = new JTextArea(" ",3,50 );
      jsp = new JScrollPane( addr, 
               JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, 
               JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED );
      gbag.setConstraints( jsp, gbclast );
      cpane.add( jsp );

      cpane.add( new JLabel("") );
      JLabel lab4 = new JLabel("Adult ");
      gbag.setConstraints( lab4, gbceast );
      cpane.add( lab4 );

      JTextField adults = new JTextField(" ",3);
      gbag.setConstraints( adults, gbc );
      cpane.add( adults );

      JLabel Ch = new JLabel("Child");
      gbag.setConstraints( Ch, gbceast );
      cpane.add( Ch );

      JTextField children = new JTextField(" ",3);
      gbag.setConstraints( children, gbc );
      cpane.add( children );

      JLabel Con = new JLabel("Concession");
      gbag.setConstraints( Con, gbceast );
      cpane.add( Con );

      JTextField concess = new JTextField(" ",3);
      gbag.setConstraints( concess, gbclast );
      cpane.add( concess );

      JPanel pane = new JPanel();
      accept = new JButton("Accept");
      pane.add( accept );
      reject = new JButton("Reject");
      pane.add( reject );
      accept.addActionListener( this );
      reject.addActionListener( this );

      quit = new JButton("Exit");
      pane.add( quit );
      gbag.setConstraints( pane, gbclast );
      cpane.add( pane );
      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();
      }
   }
}