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8252825: Add automated test for fix done in JDK-8218479 #235

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/*
* Copyright (c) 2020, 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
* @requires (os.family == "linux")
* @key headful
* @bug 8218479
* @summary Tests JTextPane background color
* @run main TestJTextPaneBackgroundColor
*/

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextPane;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Robot;

public class TestJTextPaneBackgroundColor {
private static JFrame frame;
private static JTextPane textPane;
private static Point point;
private static Rectangle rect;
private static Robot robot;
private static final String GTK_LAF_CLASS = "GTKLookAndFeel";

private static void blockTillDisplayed(Component comp) {
Point p = null;
while (p == null) {
try {
p = comp.getLocationOnScreen();
} catch (IllegalStateException e) {
try {
Thread.sleep(500);
} catch (InterruptedException ie) {
}
}
}
}

public static void main(String[] args) throws Exception {
if (!System.getProperty("os.name").startsWith("Linux")) {
System.out.println("This test is meant for Linux platform only");
return;
}

for (UIManager.LookAndFeelInfo lookAndFeelInfo :
UIManager.getInstalledLookAndFeels()) {
if (lookAndFeelInfo.getClassName().contains(GTK_LAF_CLASS)) {
try {
UIManager.setLookAndFeel(lookAndFeelInfo.getClassName());
} catch (final UnsupportedLookAndFeelException ignored) {
System.out.println("GTK L&F could not be set, so this " +
"test can not be run in this scenario ");
return;
}
}
}

robot = new Robot();
robot.setAutoDelay(100);

try {
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
JPanel panel = new JPanel();
textPane = new JTextPane();
textPane.setText(" ");
panel.add(textPane, BorderLayout.CENTER);
frame = new JFrame("TestJTextPaneBackgroundColor");
frame.add(panel);
frame.setSize(200, 200);
frame.setAlwaysOnTop(true);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});

robot.waitForIdle();
robot.delay(500);

blockTillDisplayed(textPane);
SwingUtilities.invokeAndWait(() -> {
point = textPane.getLocationOnScreen();
rect = textPane.getBounds();
});
robot.waitForIdle();
robot.delay(500);

Color textpaneBackgroundColor = robot
.getPixelColor(point.x+rect.width/2, point.y+rect.height/2);
robot.waitForIdle();
robot.delay(500);

Color panelColor = robot
.getPixelColor(point.x-rect.width/2, point.y+rect.height/2);
robot.waitForIdle();
robot.delay(500);

System.out.println(textpaneBackgroundColor);
System.out.println(panelColor);
if (textpaneBackgroundColor.equals(panelColor)) {
throw new RuntimeException("The expected background color for " +
"TextPane was not found");
}
} finally {
if (frame != null) {
SwingUtilities.invokeAndWait(frame::dispose);
}
}
}
}