/**
 * A Simple Web Browser
 * Uses a JEditorPane() which knows how to interpret HTML (and RTF and Text)
 **/

// Lots of imports!
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.html.HTMLFrameHyperlinkEvent;
import javax.swing.text.html.HTMLDocument;

public class SimpleBrowser extends JFrame {
  /// Fields
  /** A field for the URL to be entered **/
  private JTextField urlField;
  private JEditorPane webpane;
  
  /***
   * Most of the action is in the constructor.
   **/
  public SimpleBrowser(){
    super("Simple Browser");
    
    // Make a panel with a label and the URL field
    JPanel panel1=new JPanel();
    this.getContentPane().add(panel1,BorderLayout.NORTH);
    JLabel label1= new JLabel("URL:");
    panel1.add(label1,BorderLayout.EAST);
    urlField = new JTextField("http://www.cnn.com");
    urlField.addActionListener(
            new ActionListener() {
      public void actionPerformed(ActionEvent e)
      {
        String urlString = e.getActionCommand();
        try {
          webpane.setPage(urlString);
          urlField.setText(urlString);
        } catch (Exception e2) {
          System.out.println("I/O Error -- maybe bad URL?");
          System.out.println(e2.getMessage());}
      }      
    });
    panel1.add(urlField,BorderLayout.CENTER);
    
    // Second part of the browser is the viewable pane
    webpane = new JEditorPane();
    webpane.setEditable(false);
    // Make hyperlinks work (from 1.4JDK docs)
    webpane.addHyperlinkListener(
                                  new HyperlinkListener() {
          public void hyperlinkUpdate(HyperlinkEvent e) {
      if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
        JEditorPane pane = (JEditorPane) e.getSource();
        if (e instanceof HTMLFrameHyperlinkEvent) {
          HTMLFrameHyperlinkEvent  evt = (HTMLFrameHyperlinkEvent)e;
          HTMLDocument doc = (HTMLDocument)pane.getDocument();
          doc.processHTMLFrameHyperlinkEvent(evt);
         } else {
           try {
             pane.setPage(e.getURL());
           } catch (Throwable t) {
             t.printStackTrace();
           }
         }
      }
          }
    });
    this.getContentPane().add(new JScrollPane(webpane),
                              BorderLayout.CENTER);
    this.pack();
    this.setVisible(true);
  }
  
  public void loadPage(String urlString){
    try {
      webpane.setPage(urlString);
      urlField.setText(urlString);
    } catch (Exception e) {
      System.out.println("I/O Error -- maybe bad URL?");
      System.out.println(e.getMessage());}
  }
} // Class