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/*
* Copyright (c) 1998, 2025, 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 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 4029465
* @summary Win95 Multiselect List doesn't display scrollbar
* @key headful
* @run main ListScrollbarTest
*/
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Frame;
import java.awt.List;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Robot;
public class ListScrollbarTest {
private static final Color BG_COLOR = Color.RED;
private static Robot robot;
private static Frame frame;
private static List list;
private static int counter = 0;
private static volatile Rectangle listBounds;
public static void main(String[] args) throws Exception {
try {
EventQueue.invokeAndWait(ListScrollbarTest::createAndShowUI);
test();
} finally {
EventQueue.invokeAndWait(() -> {
if (frame != null) {
frame.dispose();
}
});
}
}
private static void test() throws Exception {
robot = new Robot();
robot.waitForIdle();
robot.delay(500);
EventQueue.invokeAndWait(() -> {
Point locationOnScreen = list.getLocationOnScreen();
Dimension size = list.getSize();
listBounds = new Rectangle(locationOnScreen, size);
});
Point point = new Point(listBounds.x + listBounds.width - 5,
listBounds.y + listBounds.height / 2);
for (int i = 0; i < 4; i++) {
scrollbarCheck(point, false);
addListItem();
}
scrollbarCheck(point, true);
}
public static boolean areColorsSimilar(Color c1, Color c2, int tolerance) {
return Math.abs(c1.getRed() - c2.getRed()) <= tolerance
&& Math.abs(c1.getGreen() - c2.getGreen()) <= tolerance
&& Math.abs(c1.getBlue() - c2.getBlue()) <= tolerance;
}
private static void scrollbarCheck(Point point, boolean isScrollbarExpected) {
Color pixelColor = robot.getPixelColor(point.x, point.y);
boolean areColorsSimilar = areColorsSimilar(BG_COLOR, pixelColor, 5);
if (isScrollbarExpected && areColorsSimilar) {
throw new RuntimeException(("""
Scrollbar is expected, but pixel color \
is similar to the background color
%s pixel color
%s bg color""")
.formatted(pixelColor, BG_COLOR));
}
if (!isScrollbarExpected && !areColorsSimilar) {
throw new RuntimeException(("""
Scrollbar is not expected, but pixel color \
is not similar to the background color
%s pixel color
%s bg color""")
.formatted(pixelColor, BG_COLOR));
}
}
private static void addListItem() throws Exception {
EventQueue.invokeAndWait(() -> {
counter++;
System.out.println("Adding list item " + counter);
list.add("List Item " + counter);
frame.validate();
});
robot.waitForIdle();
robot.delay(150);
}
private static void createAndShowUI() {
frame = new Frame("ListScrollbarTest");
list = new List(3, true);
list.setBackground(BG_COLOR);
// do not draw border around items, it can affect screen capture
list.setFocusable(false);
frame.add(list);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
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