Jtable background image

[Jude Fawly]

hi there,

i am using this code to display a background image in my jtable. it is working, but i dont want the image to be scrolled when using the scroll bar in the jscrollpane. how can i do that?

table = new JTable(){
public boolean isCellEditable(int a, int c)
{
return false;
}

public Component prepareRenderer(TableCellRenderer renderer, int row, int column)
{
Component c = super.prepareRenderer( renderer, row, column);
// We want renderer component to be transparent so background image is visible
if( c instanceof JComponent )
((JComponent)c).setOpaque(false);
return c;
}

ImageIcon image = new ImageIcon( "images/handbags.JPG" );

public void paint( Graphics g )
{
Dimension d = getSize();
for( int x = 0; x < d.width; x += image.getIconWidth() )
for( int y = 0; y < d.height; y += image.getIconHeight() )
g.drawImage( image.getImage(), x, y, null, null );

super.paint(g);
}
};
table.setOpaque(false);

[Jeff Albertson]

I would suggest associating the background image with the JScrollPane's JViewport.
Since the view port itself doesn't scroll, that takes care of the problem.
Here is some sample code: I like to use a border to draw the image,
and in that way avoid excess subclassing, but your mileage may vary.

import java.awt.*;
import java.awt.image.*;
import javax.swing.border.*;
 
public class CentredBackgroundBorder implements Border {
    private final BufferedImage image;
 
    public CentredBackgroundBorder(BufferedImage image) {
        this.image = image;
    }
 
    public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
        int x0 = x + (width-image.getWidth())/2;
        int y0 = y + (height-image.getHeight())/2;
        g. drawImage(image, x0, y0, null);
    }
 
    public Insets getBorderInsets(Component c) {
        return new Insets(0,0,0,0);
    }
 
    public boolean isBorderOpaque() {
        return true;
    }
}
 
/*****************************************/
 
import java.awt.*;
import java.io.*;
import java.net.URL;
import javax.imageio.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;
 
public class BackgroundBorderExample {
    public static void main(String[] args) throws IOException {
        JFrame.setDefaultLookAndFeelDecorated(true);
        JFrame f = new JFrame("BackgroundBorderExample");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JTable table = new JTable(40,8) {
            public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {
                Component c = super.prepareRenderer( renderer, row, column);
                if( c instanceof JComponent)
                    ((JComponent)c).setOpaque(false);
                return c;
            }
        };
        table.setOpaque(false);
        table.setForeground(Color.WHITE);
        final JScrollPane sp = new JScrollPane(table);
        sp.setBackground(Color.BLACK);
        sp.getViewport().setOpaque(false);
        f.getContentPane().add(sp);
        f.setSize(600,400);
        f.setLocationRelativeTo(null);
        f.setVisible(true);
        String url = "http://today.java.net/jag/bio/JagHeadshot.jpg";
        final Border bkgrnd = new CentredBackgroundBorder(ImageIO.read(new URL(url)));
        Runnable r = new Runnable() {
            public void run() {
                sp.setViewportBorder(bkgrnd);
                sp.repaint();
            }
        };
        SwingUtilities.invokeLater(r);
    }
}