bug6274267.java

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/*
 * @test
 * @key headful
 * @bug 6274267
 * @summary Checks that ScrollPaneLayout properly calculates preferred
 * layout size.
 * @author Mikhail Lapshin
 * @run main bug6274267
 */

import javax.swing.*;
import java.awt.*;

public class bug6274267 {
    private JFrame frame;
    private Component left;

    public static void main(String[] args) throws Exception {
        final bug6274267 test = new bug6274267();
        Robot robot = new Robot();
        try {
            SwingUtilities.invokeAndWait(new Runnable() {
                public void run() {
                    test.setupUI1();
                }
            });
            robot.waitForIdle();
            SwingUtilities.invokeAndWait(new Runnable() {
                public void run() {
                    test.setupUI2();
                }
            });
            test.test();
        } finally {
            if (test.frame != null) {
                test.frame.dispose();
            }
        }
    }

    private void setupUI1() {
        frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        left = new JPanel();
        left.setPreferredSize(new Dimension(100, 100));

        JPanel rightPanel = new JPanel();
        rightPanel.setPreferredSize(new Dimension(100, 50));
        Component right = new JScrollPane(rightPanel);

        JSplitPane split =
                new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, left, right);

        frame = new JFrame();
        frame.add(split);
        frame.pack();
    }

    // It is important to separate frame.pack() from frame.setVisible(true).
    // Otherwise the repaint manager will combine validate() calls and
    // the bug won't appear.
    private void setupUI2() {
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    private void test() throws Exception {
        if (left.getSize().width == 100) {
            System.out.println("Test passed");
        } else {
            throw new RuntimeException("ScrollPaneLayout sometimes improperly " +
                    "calculates the preferred layout size. ");
        }
    }
}