// Fig. 14.11: LookAndFeelDemo.java
// Changing the look and feel.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class LookAndFeelDemo extends JFrame {
   private final String strings[] = { "Metal", "Motif", "Windows" };
   private UIManager.LookAndFeelInfo looks[];
   private JRadioButton radio[];
   private ButtonGroup group;
   private JButton button;
   private JLabel label;
   private JComboBox comboBox;

   // set up GUI
   public LookAndFeelDemo()
   {
      super( "Look and Feel Demo" );

      Container container = getContentPane();

      // set up panel for NORTH of BorderLayout
      JPanel northPanel = new JPanel();
      northPanel.setLayout( new GridLayout( 3, 1, 0, 5 ) );

      // set up label for NORTH panel
      label = new JLabel( "This is a Metal look-and-feel",
         SwingConstants.CENTER );
      northPanel.add( label );

      // set up button for NORTH panel
      button = new JButton( "JButton" );
      northPanel.add( button );

      // set up combo box for NORTH panel
      comboBox = new JComboBox( strings );
      northPanel.add( comboBox );
     
      // create array for radio buttons
      radio = new JRadioButton[ strings.length ];

      // set up panel for SOUTH of BorderLayout
      JPanel southPanel = new JPanel();
      southPanel.setLayout( new GridLayout( 1, radio.length ) );

      // set up radio buttons for SOUTH panel
      group = new ButtonGroup();
      ItemHandler handler = new ItemHandler();

      for ( int count = 0; count < radio.length; count++ ) {
         radio[ count ] = new JRadioButton( strings[ count ] );
         radio[ count ].addItemListener( handler );
         group.add( radio[ count ] );
         southPanel.add( radio[ count ] );
      }

      // attach NORTH and SOUTH panels to content pane
      container.add( northPanel, BorderLayout.NORTH );
      container.add( southPanel, BorderLayout.SOUTH );

      // get installed look-and-feel information
      looks = UIManager.getInstalledLookAndFeels();

      setSize( 300, 200 );
      setVisible( true );

      radio[ 0 ].setSelected( true );

   } // end constructor LookAndFeelDemo

   // use UIManager to change look-and-feel of GUI
   private void changeTheLookAndFeel( int value )
   {
      // change look and feel
      try {
         UIManager.setLookAndFeel( looks[ value ].getClassName() );
         SwingUtilities.updateComponentTreeUI( this );
      }

      // process problems changing look and feel
      catch ( Exception exception ) {
         exception.printStackTrace();
      }
   }

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

   // private inner class to handle radio button events
   private class ItemHandler implements ItemListener {

      // process user's look-and-feel selection
      public void itemStateChanged( ItemEvent event )
      {
         for ( int count = 0; count < radio.length; count++ )

            if ( radio[ count ].isSelected() ) {
               label.setText( "This is a " +
                  strings[ count ] + " look-and-feel" );
               comboBox.setSelectedIndex( count );
               changeTheLookAndFeel( count );
            }
      }

   } // end private inner class ItemHandler

} // end class LookAndFeelDemo



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