test/jdk/javax/swing/JTabbedPane/TabProb.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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 * questions.
 */

/* @test
   @bug 8215396
   @key headful
   @summary Verifies JTabbedPane preferred size calculation is wrong
   for SCROLL_TAB_LAYOUT.
   @run main TabProb
 */

import java.awt.Component;
import java.awt.Container;
import java.awt.Color;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.LayoutManager;
import java.awt.Insets;
import java.awt.Robot;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

public class TabProb extends JFrame {
    static TabProb tb1;
    static TabProb tb2;
    class FixLayout implements LayoutManager {
        @Override
        public void layoutContainer(Container C) {
            Insets in = C.getInsets();
            int w = 200 - in.left - in.right;
            int h = 100 - in.top - in.bottom;
            C.getComponents()[0].setBounds(in.top, in.left, w, h);
        }
        @Override
        public Dimension minimumLayoutSize(Container C) {
            return new Dimension(200, 100);
        }
        @Override
        public Dimension preferredLayoutSize(Container C) {
            return new Dimension(200, 100);
        }
        @Override
        public void removeLayoutComponent(Component c) {
        }
        @Override
        public void addLayoutComponent(String s, Component c) {
        }
    }

    public TabProb(int layoutPolicy) {
        JTabbedPane tabpanel = new JTabbedPane();
        tabpanel.setTabPlacement(JTabbedPane.TOP);
        tabpanel.setTabLayoutPolicy(layoutPolicy);
        JPanel panel = new JPanel(new FixLayout());
        JLabel label = new JLabel("Label");
        label.setBorder(BorderFactory.createLineBorder(Color.green, 3));
        panel.add(label);
        tabpanel.add("TEST", panel);
        add(tabpanel, BorderLayout.CENTER);
        setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    }

    public static void main(String[] args) throws Exception {
        for (UIManager.LookAndFeelInfo laf : UIManager.getInstalledLookAndFeels()) {
            System.out.println("Test for LookAndFeel " + laf.getClassName());
            UIManager.setLookAndFeel(laf.getClassName());
            test();
            System.out.println("Test passed for LookAndFeel " + laf.getClassName());
        }
    }

    public static void test() throws Exception {
        Robot robot = new Robot();
        SwingUtilities.invokeAndWait(new Runnable() {
            @Override
            public void run() {
                tb1 = new TabProb(JTabbedPane.SCROLL_TAB_LAYOUT);
                tb1.pack();
                tb1.setVisible(true);

                tb2 = new TabProb(JTabbedPane.WRAP_TAB_LAYOUT);
                tb2.pack();
                tb2.setVisible(true);
            }
        });
        double tb1height = tb1.getPreferredSize().getHeight();
        double tb2height = tb2.getPreferredSize().getHeight();
        System.out.println(tb1height);
        System.out.println(tb2height);

        robot.waitForIdle();
        robot.delay(2000);

        SwingUtilities.invokeAndWait(() -> tb1.dispose());
        SwingUtilities.invokeAndWait(() -> tb2.dispose());

        if (tb1height != tb2height) {
            throw new RuntimeException("JTabbedPane preferred size calculation is wrong for SCROLL_TAB_LAYOUT");
        }
    }
}