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/*
* Copyright (c) 2016, 2017, 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.Image;
import java.awt.Robot;
import java.awt.Rectangle;
import java.awt.Color;
import java.awt.Point;
import java.awt.Dimension;
import java.awt.GradientPaint;
import java.awt.Graphics2D;
import java.awt.BorderLayout;
import java.awt.image.BufferedImage;
import java.awt.image.MultiResolutionImage;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.plaf.metal.MetalLookAndFeel;
/*
* @test
* @bug 8163193 8165213
* @key headful
* @summary Metal L&F gradient is lighter on HiDPI display
* @run main/othervm -Dsun.java2d.uiScale=2 ButtonGradientTest
*/
public class ButtonGradientTest {
private static JFrame frame;
private static JButton button;
private static List<Image> images;
private static Robot robot;
public static void main(String[] args) throws Exception {
try {
robot = new Robot();
testGradient();
} finally {
SwingUtilities.invokeAndWait(() -> {
if (frame != null) {
frame.dispose();
}
});
}
}
private static void testGradient() throws Exception {
// Create and show the GUI
SwingUtilities.invokeAndWait(ButtonGradientTest::createAndShowGUI);
robot.waitForIdle();
robot.delay(500);
Rectangle rect = getButtonBounds();
List<?> gradient = (List) UIManager.get("Button.gradient");
float ratio = ((Number) gradient.get(0)).floatValue();
Color c1 = (Color) gradient.get(2);
Color c2 = (Color) gradient.get(3);
int mid = (int) (ratio * rect.height);
// Get the expected gradient color
Color gradientColor = getGradientColor(rect.width, mid, c1, c2);
// Get color from robot captured hidpi image of the button
getImageFromRobot();
int x = rect.x + rect.width / 2;
int y = rect.y + mid / 2;
Color buttonColor = new Color(((BufferedImage)(images.get(1))).getRGB(
(int)(x), (int)(y)));
if (!similarColors(buttonColor, gradientColor)) {
throw new RuntimeException("Button gradient is changed!");
}
}
private static void createAndShowGUI() {
try {
UIManager.setLookAndFeel(new MetalLookAndFeel());
} catch (Exception e) {
throw new RuntimeException(e);
}
frame = new JFrame();
frame.setSize(300, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel(new BorderLayout());
button = new JButton("");
panel.add(button);
frame.getContentPane().add(panel);
frame.setVisible(true);
}
private static void getImageFromRobot() {
try {
Point butLoc = button.getLocationOnScreen();
Dimension butSize = button.getSize();
MultiResolutionImage multiResolutionImage =
robot.createMultiResolutionScreenCapture(
new Rectangle((int)butLoc.getX(),
(int)butLoc.getY(), (int)butSize.getWidth(),
(int)butSize.getHeight()));
images = multiResolutionImage.getResolutionVariants();
} catch (Exception e) {
throw new RuntimeException(e);
}
if(images.size() < 2) {
throw new RuntimeException("HiDpi Image not captured - " +
"Check is this HiDpi display system?");
}
}
private static Rectangle getButtonBounds() throws Exception {
Rectangle[] rectangles = new Rectangle[1];
SwingUtilities.invokeAndWait(() -> {
rectangles[0] = button.getBounds();
rectangles[0].setLocation(button.getLocationOnScreen());
});
return rectangles[0];
}
private static Color getGradientColor(int w, int h, Color c1, Color c2) {
GradientPaint gradient = new GradientPaint(0, 0, c1, 0, h, c2,
true);
BufferedImage img = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Graphics2D g = img.createGraphics();
g.setPaint(gradient);
g.fillRect(0, 0, w, h);
g.dispose();
return new Color(img.getRGB(w / 2, h / 2));
}
private static boolean similarColors(Color c1, Color c2) {
return similar(c1.getRed(), c2.getRed())
&& similar(c1.getGreen(), c2.getGreen())
&& similar(c1.getBlue(), c2.getBlue());
}
private static boolean similar(int i1, int i2) {
return Math.abs(i2 - i1) < 6;
}
}
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