// Fig. 19.6: LoadAudioAndPlay.java
// Load an audio clip and play it.

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

public class LoadAudioAndPlay extends JApplet {
   private AudioClip sound1, sound2, currentSound;  
   private JButton playSound, loopSound, stopSound;
   private JComboBox chooseSound;

   // load the image when the applet begins executing
   public void init()
   {
      Container container = getContentPane();
      container.setLayout( new FlowLayout() );

      String choices[] = { "Welcome", "Hi" };
      chooseSound = new JComboBox( choices );

      chooseSound.addItemListener(

         new ItemListener() {

            // stop sound and change to sound to user's selection
            public void itemStateChanged( ItemEvent e )
            {
               currentSound.stop();

               currentSound =
                  chooseSound.getSelectedIndex() == 0 ? sound1 : sound2;
            }

         } // end anonymous inner class

      ); // end addItemListener method call

      container.add( chooseSound );

      // set up button event handler and buttons
      ButtonHandler handler = new ButtonHandler();

      playSound = new JButton( "Play" );
      playSound.addActionListener( handler );
      container.add( playSound );

      loopSound = new JButton( "Loop" );
      loopSound.addActionListener( handler );
      container.add( loopSound );

      stopSound = new JButton( "Stop" );
      stopSound.addActionListener( handler );
      container.add( stopSound );

      // load sounds and set currentSound
      sound1 = getAudioClip( getDocumentBase(), "welcome.wav" );
      sound2 = getAudioClip( getDocumentBase(), "hi.au" );
      currentSound = sound1;

   } // end method init

   // stop the sound when the user switches Web pages
   public void stop()
   {
      currentSound.stop();
   }

   // private inner class to handle button events
   private class ButtonHandler implements ActionListener {

      // process play, loop and stop button events
      public void actionPerformed( ActionEvent actionEvent )
      {
         if ( actionEvent.getSource() == playSound ) 
            currentSound.play();

         else if ( actionEvent.getSource() == loopSound ) 
            currentSound.loop();

         else if ( actionEvent.getSource() == stopSound ) 
            currentSound.stop();
      }

   } // end class ButtonHandler

} // end class LoadAudioAndPlay

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