/*
* Copyright ( c ) 2022 , Oracle and / or its affiliates . All rights reserved .
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER .
*
* 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 - * < symbol > TZS < / symbol >
*
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import java.awt.AWTException;
import java.awt.Color;
import java.awt.Robot;
import java.lang.reflect.InvocationTargetException;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.SwingUtilities;
/*
* @ test
* @ bug 8259687
* @ key headful
* @ summary Tests whether the selected tab ' s component is on the top and visible .
* @ run main TabbedPaneBug
*/
public class TabbedPaneBug {
private static final int FIRST = 0 ;
private static final int SECOND = 1 ;
private static JFrame window;
private static JTabbedPane tabs;
private static final JPanel firstTab = new JPanel();
private static final JPanel secondTab = new JPanel();
public static void main(String[] args) throws AWTException,
InterruptedException, InvocationTargetException {
try {
Robot robot = new Robot();
robot.setAutoDelay(200 );
SwingUtilities.invokeAndWait(() -> createAndShowGUI());
robot.waitForIdle();
robot.mouseMove(window.getWidth()/2 , window.getHeight()/2 );
robot.delay(500 );
Color actualColor = robot.getPixelColor(window.getWidth()/2 ,
window.getHeight()/2 );
robot.delay(200 );
if (actualColor.equals(Color.RED)) {
throw new RuntimeException("The second (selected) component" +
" is not on the top!!" );
}
} finally {
SwingUtilities.invokeAndWait(() -> {
if (window != null ) {
window.dispose();
}
});
}
}
private static void createAndShowGUI() {
window = new JFrame("Tabbed Pane Bug" );
tabs = new JTabbedPane();
firstTab.setBackground(Color.RED);
secondTab.setBackground(Color.GREEN);
tabs.addChangeListener((e) -> {
if (tabs.getSelectedComponent() == null ) {
switch (tabs.getSelectedIndex()) {
case FIRST:
tabs.setComponentAt(tabs.getSelectedIndex(), firstTab);
break ;
case SECOND:
tabs.setComponentAt(tabs.getSelectedIndex(), secondTab);
break ;
default :
}
}
});
tabs.addTab("First" , null );
tabs.addTab("Second" , null );
tabs.setSelectedIndex(SECOND);
window.add(tabs);
window.setSize(200 , 200 );
window.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
window.setVisible(true );
}
}
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¤ Dauer der Verarbeitung: 0.12 Sekunden
(vorverarbeitet am 2026-06-10)
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