Source code: org/ydp/gfx/FilePreviewer.java

   package org.ydp.gfx;
   
   import javax.swing.event.*;
   import javax.swing.*;
   
   import java.awt.event.*;
   import java.awt.*;
   
   import java.beans.*;
  import java.io.*;
  
  public class FilePreviewer extends JComponent implements PropertyChangeListener 
  {
      ImageIcon thumbnail = null;
      File f = null;
  
      public FilePreviewer(JFileChooser fc) 
      {
    setPreferredSize(new Dimension(100, 50));
    fc.addPropertyChangeListener(this);
      }
  
      public FilePreviewer()
      {
          setPreferredSize(new Dimension(100, 50));
      }
  
      public void loadImage() 
      {
    if(f != null) 
    {
        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);
    }
      }
  }