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/*
 * @test
 * @bug 6435715
 * @summary JButton stops receiving the focusGained event and eventually focus is lost altogether
 * @modules java.desktop/sun.awt
 * @library /java/awt/regtesthelpers
 * @build PassFailJFrame
 * @run main/manual bug6435715
 */

import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class bug6435715 {

    private static final String INSTRUCTIONS = """
            1. after test started you will see frame with three buttons. Notice that focus is on Button2.
            2. Click on Button 3. Focus goes to Button3.
            3. Click on Button1 and quickly switch to another window. Via either alt/tab or
            clicking another window with the mouse.
            4. After a few seconds, come back to the frame. Notice that focus is around Button2
            5. Click at Button3. If focus remains at Button2 test failed, if focus is on Button3 - test passed.""";

    public static void main(String[] args) throws Exception {
        PassFailJFrame.builder()
                .title("bug6435715 Instructions")
                .instructions(INSTRUCTIONS)
                .rows((int) INSTRUCTIONS.lines().count() + 5)
                .columns(35)
                .testUI(bug6435715::createTestUI)
                .build()
                .awaitAndCheck();
    }

    private static JFrame createTestUI() {
        JFrame fr = new JFrame("FocusIssue");
        sun.awt.SunToolkit.setLWRequestStatus(fr, true);

        JPanel panel = new JPanel();
        final JButton b1 = new JButton("Button 1");
        final JButton b2 = new JButton("Button 2");
        final JButton b3 = new JButton("Button 3");

        panel.add(b1);
        panel.add(b2);
        panel.add(b3);

        b1.addFocusListener(new FocusAdapter() {
            public void focusGained(FocusEvent event) {
                synchronized (this) {
                    try {
                        wait(1000);
                    } catch (Exception ex) {
                        ex.printStackTrace();
                    }
                    b2.requestFocus();
                }
            }
        });
        fr.getContentPane().add(panel);
        fr.pack();
        return fr;
    }

}