/*
 *  ==============================================================
 *  DemoCardLayout.java : Create card layout manager. This applet
 *  .... 
 *  Card 1 : Software Company sites
 *           JavaSoft, Sun, IBM, Boeing
 *  Card 2 : Aerospace Company sites
 *           NASA, Boeing, Lockheed, Northrop.
 * 
 *  Adapted from : Pantham S., Pure JFC Swing, 1999.
 *  Modified by : Mark Austin                          March, 2001
 *  ==============================================================
 */

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

public class DemoCardLayout extends JApplet {

    // 1. Declare some panel and button references.

    JPanel controlPanel;
    JPanel cardsPanel, swCompPanel, aeroCompPanel;
    JButton     nextButton, previousButton;
    JButton javasoftButton,    sunButton,      ibmButton, netscapeButton;
    JButton     nasaButton, boeingButton, lockheedButton, northropButton;
    URL currentSite = null;

    // 2. Define the string arrays for the sites and site urls.

    String[] swCompSites   = {         "JavaSoft",
                               "Sun Microsystems",
                                            "IBM",
                                       "NetScape" };
    String[] aeroCompSites = {     "NASA",
                                 "Boeing",
                               "Lockheed",
                               "Northrop" };
    String[] siteURLs = { "http://www.javasoft.com/",
                          "http://www.sun.com/",
                          "http://www.ibm.com/",
                          "http://www.netscape.com/" };

    Container container = null;

    public void init() {

       // 3. Get a handle on the applet's content pane.

       container = this.getContentPane();

       // 4. Create a control panel object.

       controlPanel = new JPanel();
       controlPanel.setLayout(new GridLayout(1,2,10,10));

       // 5. Create and add the next and previous control buttons.

       ButtonListener listener = new ButtonListener();

       nextButton = new JButton("Next Card");
       nextButton.setActionCommand("Next Button");
       nextButton.addActionListener(listener);
       controlPanel.add(nextButton);

       previousButton = new JButton("Previous Card");
       previousButton.setEnabled(false);
       previousButton.setActionCommand("Previous Button");
       previousButton.addActionListener(listener);
       controlPanel.add(previousButton);

       // 6. Create a panel to contain the cards.

       /* Each card will display a set of buttons to
          visit a specific Web site. */

       cardsPanel = new JPanel();
       cardsPanel.setLayout(new CardLayout());
       swCompPanel   = new JPanel();
       aeroCompPanel = new JPanel();
       swCompPanel.setLayout(new GridLayout(2,2,10,10));
       aeroCompPanel.setLayout(new GridLayout(2,2,10,10));

       // 7. Add buttons to the these cards.

       for (int i=0; i<swCompSites.length; i++) {
           JButton b = new JButton(swCompSites[i]);
           b.addActionListener(listener);
           b.setActionCommand(swCompSites[i]);
           swCompPanel.add(b);
       }

       for (int i=0; i<aeroCompSites.length; i++) {
           JButton b = new JButton(aeroCompSites[i]);
           b.addActionListener(listener);
           b.setActionCommand(aeroCompSites[i]);
           aeroCompPanel.add(b);
       }

       // 8. Add the company-list panels to cards panel.

       cardsPanel.add("Next Card", swCompPanel);
       cardsPanel.add("Previous Card", aeroCompPanel);

       // 9. Finally, add the control and the cards panels to
       //    the applet's content pane.

       ((BorderLayout)container.getLayout()).setVgap(10);
       container.add("North", controlPanel);
       container.add("Center", cardsPanel);
    }

    // 10. Functionality to be executed when the next-button
    //     is activated.
  
    public void showNextCard() {
       nextButton.setEnabled(false);
       ((CardLayout) cardsPanel.getLayout()).next(cardsPanel);
       previousButton.setEnabled(true);
    }

    // 11. Functionality to be executed when the previous-button
    //     is activated.

    public void showPreviousCard() {
       previousButton.setEnabled(false);
       ((CardLayout) cardsPanel.getLayout()).previous(cardsPanel);
       nextButton.setEnabled(true);
    }

    // 12. Functionality to display the specific Web page.

    public void toDestination(String aSite) {
       System.out.println("Connecting to the web site...");
       try {
           currentSite = new URL(aSite);
       }
       catch (MalformedURLException e) {
          System.out.println("Unknown URL Address: " + aSite);
       }
       getAppletContext().showDocument(currentSite);
    }

    // 13. The action listener class.

    class ButtonListener implements ActionListener {
        public void actionPerformed(ActionEvent ae) {
            JButton tempButton = (JButton) ae.getSource();

            // 14. If the next or previous buttons are pressed...

            if (tempButton.getActionCommand() == "Next Button") {
                showNextCard();
            }
            else if (tempButton.getActionCommand() == "Previous Button") {
                showPreviousCard();
            }

            // 15. If the Web site buttons are pressed...

            for (int i=0; i<swCompSites.length; i++) {
                if (tempButton.getActionCommand() == swCompSites[i])
                    toDestination(siteURLs[i]);
            }
        }
    }
}