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Bug
-
Resolution: Fixed
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P3
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8, 9, 10, 11
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b14
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x86_64
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generic
ADDITIONAL SYSTEM INFORMATION :
Linux 4.8.0-53-generic #56~16.04.1-Ubuntu SMP Tue May 16 01:18:56 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
A DESCRIPTION OF THE PROBLEM :
When displaying an HTML unordered list in a JEditorPane, the bullets generated by <li> have lower quality: the circular bullets do not look round enough.
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the attached example code (TextSample class).
The upper html is rendered in a default JEditorPane (the issue is reproduced here).
The lower html is rendered in a JEditorPane configured to use rendering hints to turn on anti-aliasing property KEY_ANTIALIASING (the issue is not reproduced here).
EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Default JEditorPane unordered list bullets look round.
ACTUAL -
Default JEditorPane unordered list bullets look pixelated.
---------- BEGIN SOURCE ----------
import javax.swing.*;
import java.awt.*;
public class TextSample {
private static String getHtml() {
return "<html><body>" +
"<ul>" +
"<li>Text</li>" +
"</ul>" +
"</body></html>";
}
private static Component createSplitPane() {
JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT,
createHtmlViewer(false), createHtmlViewer(true));
splitPane.setOneTouchExpandable(true);
splitPane.setResizeWeight(0.5);
splitPane.setPreferredSize(new Dimension(150, 110));
return splitPane;
}
private static Component createHtmlViewer(boolean antialiasing) {
JEditorPane editorPane;
if (antialiasing) {
editorPane = new JEditorPane() {
@Override
public void paint(Graphics g) {
Graphics2D g2d = (Graphics2D) g.create();
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
super.paint(g2d);
g2d.dispose();
}
};
}
else {
editorPane = new JEditorPane();
}
editorPane.setEditable(false);
editorPane.setContentType("text/html");
editorPane.setText(getHtml());
return new JScrollPane(editorPane);
}
private static void createAndShowGUI() {
JFrame frame = new JFrame("List Bullets");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.add(createSplitPane());
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(TextSample::createAndShowGUI);
}
}
---------- END SOURCE ----------
CUSTOMER SUBMITTED WORKAROUND :
As pointed out in https://stackoverflow.com/a/16491992/806803, JEditorPane should use rendering hints to turn on anti-aliasing property KEY_ANTIALIASING.
FREQUENCY : always
Linux 4.8.0-53-generic #56~16.04.1-Ubuntu SMP Tue May 16 01:18:56 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
A DESCRIPTION OF THE PROBLEM :
When displaying an HTML unordered list in a JEditorPane, the bullets generated by <li> have lower quality: the circular bullets do not look round enough.
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the attached example code (TextSample class).
The upper html is rendered in a default JEditorPane (the issue is reproduced here).
The lower html is rendered in a JEditorPane configured to use rendering hints to turn on anti-aliasing property KEY_ANTIALIASING (the issue is not reproduced here).
EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Default JEditorPane unordered list bullets look round.
ACTUAL -
Default JEditorPane unordered list bullets look pixelated.
---------- BEGIN SOURCE ----------
import javax.swing.*;
import java.awt.*;
public class TextSample {
private static String getHtml() {
return "<html><body>" +
"<ul>" +
"<li>Text</li>" +
"</ul>" +
"</body></html>";
}
private static Component createSplitPane() {
JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT,
createHtmlViewer(false), createHtmlViewer(true));
splitPane.setOneTouchExpandable(true);
splitPane.setResizeWeight(0.5);
splitPane.setPreferredSize(new Dimension(150, 110));
return splitPane;
}
private static Component createHtmlViewer(boolean antialiasing) {
JEditorPane editorPane;
if (antialiasing) {
editorPane = new JEditorPane() {
@Override
public void paint(Graphics g) {
Graphics2D g2d = (Graphics2D) g.create();
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
super.paint(g2d);
g2d.dispose();
}
};
}
else {
editorPane = new JEditorPane();
}
editorPane.setEditable(false);
editorPane.setContentType("text/html");
editorPane.setText(getHtml());
return new JScrollPane(editorPane);
}
private static void createAndShowGUI() {
JFrame frame = new JFrame("List Bullets");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.add(createSplitPane());
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(TextSample::createAndShowGUI);
}
}
---------- END SOURCE ----------
CUSTOMER SUBMITTED WORKAROUND :
As pointed out in https://stackoverflow.com/a/16491992/806803, JEditorPane should use rendering hints to turn on anti-aliasing property KEY_ANTIALIASING.
FREQUENCY : always
- relates to
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- Open
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