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

I found the real reason of my problem.

It was the thread problem, not the animation itself. I was calling setSelectedIndex outside EDT so my JTabbedPane was updated instantly and then the animation from EDT was performed.

The anserw is:

public void setSelectedTab(final int tab) throws InterruptedException, InvocationTargetException{
    if(!SwingUtilities.isEventDispatchThread()){
        SwingUtilities.invokeAndWait(new Runnable() {
            @Override
            public void run() {
                animatedTabbedPane.setSelectedIndex(tab);
            }
        });
    }
    else
        animatedTabbedPane.setSelectedIndex(tab);
}

Changing tabs inside EDT doesn't couse unwanted flash anymore.

Answer 2

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();
            }
        });
    }
}