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import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIDefaults;
import javax.swing.UIManager;
public class ActiveSample {
private static final String LABEL_FACTORY = "LabelFactory";
public static void main(String args[]) {
JFrame frame = new JFrame("Active Example");
UIManager.put(LABEL_FACTORY, new ActiveLabel());
final JPanel panel = new JPanel();
JButton button = new JButton("Get");
ActionListener actionListener = new ActionListener() {
public void actionPerformed(ActionEvent actionEvent) {
JLabel label = (JLabel) UIManager.get(LABEL_FACTORY);
panel.add(label);
panel.revalidate();
}
};
button.addActionListener(actionListener);
Container contentPane = frame.getContentPane();
contentPane.add(panel, BorderLayout.CENTER);
contentPane.add(button, BorderLayout.SOUTH);
frame.setSize(200, 200);
frame.setVisible(true);
}
}
class ActiveLabel implements UIDefaults.ActiveValue {
private int counter = 0;
public Object createValue(UIDefaults defaults) {
JLabel label = new JLabel("" + counter++);
return label;
}
}
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