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/*
* Copyright (c) 1999, 2024, 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.
*/
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Frame;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
/*
* @test
* @bug 4237529
* @key headful
* @summary Test repainting of an empty frame
* @run main EmptyFrameTest
*/
public class EmptyFrameTest {
private static Frame f;
private static Robot robot;
private static volatile Point p;
private static volatile Dimension d;
private static final int TOLERANCE = 5;
public static void main(String[] args) throws Exception {
robot = new Robot();
robot.setAutoDelay(100);
try {
EventQueue.invokeAndWait(() -> {
createAndShowUI();
});
robot.delay(1000);
f.setSize(50, 50);
robot.delay(500);
EventQueue.invokeAndWait(() -> {
p = f.getLocation();
d = f.getSize();
});
Rectangle rect = new Rectangle(p, d);
BufferedImage img = robot.createScreenCapture(rect);
if (chkImgBackgroundColor(img)) {
try {
ImageIO.write(img, "png", new File("Frame.png"));
} catch (IOException ignored) {}
throw new RuntimeException("Frame doesn't repaint itself on resize");
}
} finally {
EventQueue.invokeAndWait(() -> {
if (f != null) {
f.dispose();
}
});
}
}
private static void createAndShowUI() {
f = new Frame("EmptyFrameTest");
f.setUndecorated(true);
f.setBackground(Color.RED);
f.setVisible(true);
}
private static boolean chkImgBackgroundColor(BufferedImage img) {
for (int x = 1; x < img.getWidth() - 1; ++x) {
for (int y = 1; y < img.getHeight() - 1; ++y) {
Color c = new Color(img.getRGB(x, y));
if ((c.getRed() - Color.RED.getRed()) > TOLERANCE) {
return true;
}
}
}
return false;
}
}
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