import javax.swing.*;
import java.beans.*;
import java.awt.*;
import java.io.File;

public class ImagePreview extends JComponent 
		           implements PropertyChangeListener {
    ImageIcon thumbnail = null;
    File f = null;
                             
    public ImagePreview(JFileChooser fc) {
	setPreferredSize(new Dimension(100, 50));
	fc.addPropertyChangeListener(this);
    }

    public void loadImage() {
	if (f == null)
	    return;
 
	ImageIcon tmpIcon = new ImageIcon(f.getPath());
	if (tmpIcon.getIconWidth() > 90) {
	    thumbnail = new ImageIcon(tmpIcon.getImage().
				      getScaledInstance(90, -1,
							Image.SCALE_DEFAULT));
	} else {
	    thumbnail = tmpIcon;
	}
    }

    public void propertyChange(PropertyChangeEvent e) {
	String prop = e.getPropertyName();
	if (prop == JFileChooser.SELECTED_FILE_CHANGED_PROPERTY) {
	    f = (File) e.getNewValue();
	    if(isShowing()) {
		loadImage();
		repaint();
	    }
	}
    }

    public void paint(Graphics g) {
	if (thumbnail == null) {
	    loadImage();
	}
	if (thumbnail != null) {
	    int x = getWidth()/2 - thumbnail.getIconWidth()/2;
	    int y = getHeight()/2 - thumbnail.getIconHeight()/2;

	    if (y < 0) {
		y = 0;
	    }

	    if (x < 5) {
		x = 5;
	    }
	    thumbnail.paintIcon(this, g, x, y);
	}
    }
}