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

// Ejemplo de hilos provenienten de
// AnimationApplet
// Por David Reilly
// como ejemplo pra "hilos desenredados"
//

public class Ticker0 extends JPanel
{
    private String animationString;
    private Font animationFont;
    private int animationWidth;
    private int xoffset;
    private int tickerWidth;
    
    public static final Dimension DEFAULT_SIZE = new Dimension( 400, 200 );
    
    public Ticker0(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 mouseClicked( MouseEvent e )
            {
                // se mueve 5 píxels a la izquierda con cada clic del ratón
                xoffset -= 5;
                // si la cadena queda fuera de la pantalla, retrocede a la derecha
                if (xoffset <= -animationWidth)
                    xoffset = tickerWidth;
                repaint();
            }
        } );
    }
    
    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 static void main( String [] args )
    {
        JFrame aFrame = new JFrame( "Ticker" );
        aFrame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        
        Ticker0 theTicker = new Ticker0( "Haga clic para que avance." );
        aFrame.getContentPane().add( theTicker, BorderLayout.CENTER );
        aFrame.pack();
        aFrame.setVisible( true );
    }
}