/*
    The HighLowLauncher applet displays just one button.  When the
    user clicks that button, a window belonging to the class 
    HighLowFrame is opened.  The name of the button changes from
    "Launch HighLow" to "Close HighLow".  The name changes
    back when the window is closed.  If the window is still open
    when the applet is destroyed, then the window will be closed
    automatically.  This applet depends on the classes defined
    in the file HighLowFrame.java.
    
*/

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


public class HighLowLauncher extends JApplet implements ActionListener {

   HighLowFrame highLow;  // the HighLow window;
                              // this is null if the window is not open

   JButton launchButton;   // a button for opening the window 
   

   public void init() {  // initialize the applet
        
      launchButton = new JButton("Launch HighLow");
      getContentPane().add(launchButton);
      launchButton.addActionListener(this);
      
   } // end init();


   public void actionPerformed(ActionEvent evt) {
            // respond to a click on the button; if no window
            // is open, open one; if a window is open, close it
            // by calling its dispose() method.
       if (highLow == null) {
          Image cards = getImage(getCodeBase(),"smallcards.gif");
             // The image for the cards must be provided as a
             // parameter to the constructor.  This is done because
             // only an applet has a getImage() method.
          highLow = new HighLowFrame(cards);
          launchButton.setText("Close HighLow");
          highLow.addWindowListener(new WindowAdapter() {
                public void windowClosed(WindowEvent evt) {
                   launchButton.setText("Launch HighLow");
                   launchButton.setEnabled(true);
                   highLow = null;
                }
             });
       }
       else {
          launchButton.setEnabled(false);  // disable button while waiting
                                           // for window to close
          highLow.dispose();
       }
   }  
   
   public void destroy() {
         // when the applet is destroyed, check if there is
         // a window open; if so, close it.
      if (highLow != null) {
          highLow.dispose();
          highLow = null;
       }
   }
   
}