import javax.swing.*;
import java.beans.*;
import java.awt.*;
import java.io.File;
public class ImagePreview extends JComponent
implements PropertyChangeListener {
ImageIcon thumbnail = null;
File file = null;
public ImagePreview(JFileChooser fc) {
setPreferredSize(new Dimension(100, 50));
fc.addPropertyChangeListener(this);
}
public void loadImage() {
if (file == null) {
return;
}
ImageIcon tmpIcon = new ImageIcon(file.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.equals(JFileChooser.SELECTED_FILE_CHANGED_PROPERTY)) {
file = (File) e.getNewValue();
if (isShowing()) {
loadImage();
repaint();
}
}
}
public void paintComponent(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);
}
}
}
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