// Fig. 13.26: GridLayoutDemo.java
// Demonstrating GridLayout.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class GridLayoutDemo3 extends JFrame implements ActionListener {
   private MyButton buttons[];
   private final String names[] = 
      { "one", "two", "three", "four", "five", "six" };
   private boolean toggle = true;
   private Container container;
   private GridLayout grid1, grid2;

   // set up GUI
   public GridLayoutDemo3()
   {
      super( "GridLayout Demo" );

      // set up layouts
      grid1 = new GridLayout( 2, 3, 5, 5 );
      grid2 = new GridLayout( 3, 2 );

      // get content pane and set its layout
      container = getContentPane();
      container.setLayout( grid1 );

      // create and add buttons
      buttons = new MyButton[ names.length ];

      for ( int count = 0; count < names.length; count++ ) {
         buttons[ count ] = new MyButton( names[ count ] , count );
         buttons[ count ].addActionListener( this );
         buttons[ count ].addActionListener( new ButtonHandler (count) );
         container.add( buttons[ count ] );
      }

      setSize( 300, 150 );
      setVisible( true );

   } // end constructor GridLayoutDemo

   // handle button events by toggling between layouts
   public void actionPerformed( ActionEvent event )
   { 
      if ( toggle )
         container.setLayout( grid2 );
      else
         container.setLayout( grid1 );

      toggle = !toggle;   // set toggle to opposite value
      container.validate();
   }

  // inner class for button event handling
   private class ButtonHandler implements ActionListener {
       private int handlerNumber;

      public ButtonHandler (int val)
         {
           super();
           handlerNumber = val;
         }

      // handle button event
      public void actionPerformed( ActionEvent event )
      {
         JOptionPane.showMessageDialog( null,
            "You pressed: " + event.getActionCommand() +" from hander " + handlerNumber );

         // user pressed Enter in JTextField textField1
         MyButton buttonUsed = (MyButton) event.getSource();
	 JOptionPane.showMessageDialog( null,
                         "Message 2: You pressed: " + buttonUsed.getText() +
                         " from hander " + buttonUsed.getNumber() );

	 for ( int count = 0; count < names.length; count++ ) {
              if (buttonUsed == buttons [count] )
                     JOptionPane.showMessageDialog( null,
                         "Message 3: You pressed: " + buttonUsed.getText() +
                         " from hander " + count );
		}
      }

   } // end private inner class ButtonHandler

   public static void main( String args[] )
   {
      GridLayoutDemo3 application = new GridLayoutDemo3();
      application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
   } 

} // end class GridLayoutDemo

class MyButton extends JButton
{
 private int buttonNumber;
 
 public MyButton (int val)
    {
      super ();
      buttonNumber= val;
     }

 public MyButton (String text, int val)
    {
      super (text);
      buttonNumber= val;
     }

 public void setNumber (int val)
    {
     buttonNumber= val;
    } 

 public int getNumber ()
    {
     return buttonNumber;
    }

}

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 * (C) Copyright 1992-2003 by Deitel & Associates, Inc. and               *
 * Prentice Hall. All Rights Reserved.                                    *
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