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How to dynamically update the appearance of a component |
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This Java Swing tip illustrates a method of dynamically updating the appearance
of a component. The tip uses the revalidate() method to dynamically update the
appearance of a component. This example changes the size of a button's font on
the fly.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class RevalidateExample extends JFrame {
public RevalidateExample() {
super("Revalidation Demo");
setSize(300,150);
setDefaultCloseOperation(EXIT_ON_CLOSE);
// Create a single button
Font font = new Font("Dialog", Font.PLAIN, 10);
final JButton b = new JButton("Add");
b.setFont(font);
Container c = getContentPane();
c.setLayout(new FlowLayout());
c.add(b);
// Increase the size of the button's font each time it's clicked
b.addActionListener(new ActionListener() {
int size = 10;
public void actionPerformed(ActionEvent ev) {
b.setFont(new Font("Dialog", Font.PLAIN, ++size));
// invalidates the button & validates its root pane
b.revalidate();
}
});
}
public static void main(String[] args) {
RevalidateExample re = new RevalidateExample();
re.setVisible(true);
}
}
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