// File: Browser2.java
// Tim Balls : Sept 1999
// Adds a scroll area to the display

// Displays the contents of a URL
// Can follow hyperlinks
// Uses Swing classes : JFrame and JEditorPane
// Adds JScrollPane - a controller for a JViewPort


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

public class Browser2 extends JFrame implements HyperlinkListener
{	public static void main( String[] args )
	{	new Browser2( args[0] );
	}

	private JEditorPane html;
	private URL url;
	public Browser2( String site )
	{	setSize( 350, 450 );
		setTitle( "Scrolling Browser" );
		addWindowListener( new WindowAdapter() {
			public void windowClosing( WindowEvent e )
			{	System.exit( 0 );
			}
		});

		try
		{	url = new URL( site );
		}
		catch( MalformedURLException e )
		{	System.out.println( "Invalid URL specified" );
			System.exit( 0 );
		}
		try
		{	html = new JEditorPane( url );
		}
		catch( IOException e )
		{	System.out.println( "Can't load url: " + url );
			System.exit( 0 );
		}
		
		JScrollPane scroller = new JScrollPane();
		JViewport viewport = scroller.getViewport();
		viewport.add( html );
		
		getContentPane().add( scroller );
		html.setEditable( false ); // to allow links to be activated
		html.addHyperlinkListener( this );
		
		setVisible( true );
	}

	// When a hyperlink is "clicked" :-
	public void hyperlinkUpdate( HyperlinkEvent e )
	{	if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED)
		{	try
			{  html.setPage( e.getURL() );
			}
			catch( IOException ioe )
			{	System.out.println( "Can't load url: " + url );
				System.exit( 0 );
			}
		}
	}
}