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

// Ejemplo proveniente de
// AnimationApplet
// By David Reilly
// un ejemplo de "hilos desenredados",
// http://www.javacoffeebreak.com/articles/threads/
//

public class Ticker2
    extends JPanel implements Runnable
{
    private Thread animationThread = null;

    private String animationString;
    private Font animationFont;
    private int animationWidth;
    private int xoffset;
    private int tickerWidth;
    
    private boolean animate = true;
    
    public static final Dimension DEFAULT_SIZE = new Dimension( 400, 200 );
    
    public Ticker2( String  s )
    {
        animationString = s;
        setOpaque( true );
        setBackground( Color.black );
        setForeground( Color.white );
        animationFont = new Font( "SansSerif", Font.BOLD, 16);
        animationWidth = getFontMetrics( animationFont ).stringWidth( animationString );
        setFont( animationFont );
        xoffset = 15;
        tickerWidth = DEFAULT_SIZE.width;
        
        addMouseListener( new MouseAdapter()
        {
            public void mousePressed( MouseEvent e )
            {
                animate = false;
            }
            
            public void mouseReleased( MouseEvent e )
            {
                animate = true;
            }
        } );
        
        // Pasa nuestro hilo a una instancia de java.lang.Runnable (us)
        animationThread = new Thread(this);
        
        // Inicia el hilo (el nuevo hilo ejecuta el método public void run()
        animationThread.start();
    }
    
    public Dimension getPreferredSize()
    {
        return DEFAULT_SIZE;
    }
    
    public void paintComponent(Graphics g)
    {
        super.paintComponent( g );
        int yoffset = getHeight() / 2;
        tickerWidth = getWidth();  // permite reajustar tamaño
        g.drawString( animationString, xoffset, yoffset );
    }
    
    public void run()
    {
        while (true)
        {
            try
            {
                if (animate == false)
                {
                    Thread.sleep(100);
                    continue;
                }
                
                // Disminuye xOffset para el efecto de desplazamiento
                xoffset--;
                // si la cadena se sale de la pantalla, vuelve a la derecha
                if (xoffset <= -animationWidth)
                    xoffset = tickerWidth;
                
                repaint();
                Thread.sleep(10);
            }
            catch (InterruptedException e)
            {}
        }
    }
    
    public static void main( String [] args )
    {
        JFrame aFrame = new JFrame( "Ticker" );
        aFrame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        
        Ticker2 theTicker = new Ticker2( "Pulse para detenerme." );
        aFrame.getContentPane().add( theTicker, BorderLayout.CENTER );
        aFrame.pack();
        aFrame.setVisible( true );
    }
}