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/*
 * @test
 * @bug 4251781
 * @summary Tests that JWindow repaint is optimized (background is not
            cleared).
 * @library /java/awt/regtesthelpers
 * @build PassFailJFrame
 * @run main/manual bug4251781
 */

import java.awt.Color;
import java.awt.Container;
import javax.swing.JButton;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;
import javax.swing.JWindow;

public class bug4251781 {
    private static final String INSTRUCTIONS = """
            Press the button at the bottom-right corner of the gray
            window with the mouse.
            If the window DOES NOT flicker when you press and/or release
            the mouse button press PASS else FAIL.
            """;

    public static void main(String[] args) throws Exception {
        PassFailJFrame.builder()
                .instructions(INSTRUCTIONS)
                .columns(40)
                .testUI(bug4251781::createAndShowUI)
                .build()
                .awaitAndCheck();
    }

    private static JWindow createAndShowUI() {
        JWindow w = new JWindow();
        final Container pane = w.getContentPane();
        pane.setLayout(null);
        pane.setBackground(Color.GRAY.darker());

        final JPopupMenu popup = new JPopupMenu();
        popup.add(new JMenuItem("item 1"));
        popup.add(new JMenuItem("exit"));

        JButton b = new JButton("menu");
        b.setBounds(350, 250, 50, 50);
        b.addActionListener(ev -> popup.show(pane, 0, 0));
        pane.add(b);

        w.setSize(400, 300);
        return w;
    }
}