Fire stateChanged event on JTabbedPane

Question

I have JTabbedPane with fade animation, which is performed when user clicks tabs. To handle animation I override stateChanged method.

public class A         


        

Answer 1

One approach would be to add an AncestorListener to each tab's content. Let the listener trigger the desired effect as the tab is added to or removed from visibility.

import java.awt.EventQueue;
import java.util.Date;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.event.AncestorEvent;
import javax.swing.event.AncestorListener;

/**
 * @see http://stackoverflow.com/a/17993449/230513
 */
public class Test {

    private void display() {
        JFrame f = new JFrame("Test");
        final JTabbedPane jtp = new JTabbedPane();
        jtp.add("One", createPanel());
        jtp.add("Two", createPanel());
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(jtp);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }

    private JPanel createPanel() {
        JPanel panel = new JPanel();
        final JLabel label = new JLabel(new Date().toString());
        panel.add(label);
        panel.addAncestorListener(new AncestorListener() {
            @Override
            public void ancestorAdded(AncestorEvent event) {
                // start animation
                label.setText(new Date().toString());
            }

            @Override
            public void ancestorRemoved(AncestorEvent event) {
                // stop animation
            }

            @Override
            public void ancestorMoved(AncestorEvent event) {
            }
        });
        return panel;
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                new Test().display();
            }
        });
    }
}