/*
 * MyBrowser
 * 
 * Version 1.0
 *
 * 20061003
 * 
 * Author: Jenny Nordgren
 */

/**
 * MyBrowser is a simple webbrowser that displays html source code 
 */

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.*;
import java.io.*;


public class MyBrowser extends JFrame implements ActionListener {


    private JTextField addressField = new JTextField(30);
    private JTextArea documentArea = new JTextArea();
    private JLabel messageLabel = new JLabel();

    public MyBrowser() {

	setDefaultCloseOperation(EXIT_ON_CLOSE);
	Container con = getContentPane();
	con.setLayout(new BorderLayout());

	this.setTitle("MyBrowser");

	JButton knapp1 = new JButton("Go!");	
	knapp1.addActionListener(this);

	JLabel addressFieldLabel = new JLabel("Adress:");

	addressField.addActionListener(this);
	addressField.setEditable(true);

	documentArea.setEditable(false);

	JScrollPane scroller = new JScrollPane(documentArea);
	//scroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);

	JPanel addressPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
	addressPanel.add(addressFieldLabel);
	addressPanel.add(addressField);	
	addressPanel.add(knapp1);
	
	messageLabel.setOpaque(true);
	messageLabel.setBackground(Color.YELLOW);
	messageLabel.setVisible(false);

	con.add(addressPanel, BorderLayout.NORTH);
	con.add(scroller, BorderLayout.CENTER);
	con.add(messageLabel, BorderLayout.SOUTH);
	
	setSize(600, 600);
	setVisible(true);	
    }
    
    /**
     * actionPerformed är den metod som implementeras från Interfacet ActionListener. Beroende på vilken 
     * knapp användaren trycker på så kan knapparna få ny text, aktiveras eller avaktiveras samt att knapparna
     * styr de två trådarna som kan påverkas enligt knapptexten.
     * 
     */
    
    public void actionPerformed(ActionEvent e) {


	    
	try {
	    messageLabel.setVisible(false);
	    documentArea.setText("");
	    URL address = new URL(addressField.getText());

	    if (address.getHost().equals("") || address.getHost().trim().equals("http://")) {
		throw new MalformedURLException();
	    }

	    BufferedReader in = new BufferedReader(
						   new InputStreamReader(
									 address.openStream()));
	    String line;

	    while((line = in.readLine()) != null) {
		documentArea.append(line);
		documentArea.append("\n");
	    }
	    documentArea.setCaretPosition(0);
	}
	catch (MalformedURLException mue) {messageLabel.setText("Skriv in en korrekt utformad webb-adress!"); messageLabel.setVisible(true); }
	catch (IOException ioe) {messageLabel.setText("Sidan du vill se kunde inte hittas! Prova med en annan adress!"); messageLabel.setVisible(true); } 

    }
    
    public static void main(String args[]) {
	MyBrowser browser = new MyBrowser();
    }
}