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/*
* @test
* @bug 8213781
* @summary Verify webpage background color renders correctly in JEditorPane
*/
import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Objects;
import java.util.stream.IntStream;
import javax.imageio.ImageIO;
import javax.swing.JEditorPane;
import javax.swing.text.StyleConstants;
import javax.swing.text.View;
import static java.awt.image.BufferedImage.TYPE_INT_RGB;
import static java.lang.Integer.toHexString;
public final class TestBrowserBGColor {
private static final String HTML_DOC =
""
+ ""
+ ""
+ "Title"
+ " ";
private static final int SIZE = 300;
public static void main(final String[] args) throws Exception {
JEditorPane browser = new JEditorPane("text/html", HTML_DOC);
browser.setEditable(false);
browser.setSize(SIZE, SIZE);
BufferedImage image = new BufferedImage(SIZE, SIZE, TYPE_INT_RGB);
Graphics g = image.getGraphics();
browser.paint(g);
g.dispose();
Color bgColor = StyleConstants.getBackground(
getBodyView(browser.getUI()
.getRootView(browser))
.getAttributes());
if (!bgColor.equals(Color.WHITE)) {
saveImage(image);
throw new RuntimeException("Wrong background color: "
+ toHexString(bgColor.getRGB())
+ " vs "
+ toHexString(Color.WHITE.getRGB()));
}
}
private static View getBodyView(final View view) {
if ("body".equals(view.getElement()
.getName())) {
return view;
}
return IntStream.range(0, view.getViewCount())
.mapToObj(view::getView)
.map(TestBrowserBGColor::getBodyView)
.filter(Objects::nonNull)
.findFirst()
.orElse(null);
}
private static void saveImage(BufferedImage image) {
try {
ImageIO.write(image, "png",
new File("html-rendering.png"));
} catch (IOException ignored) {
}
}
}