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Swing allows html in components like JLabel. This document talks about this in detail. It also shows how the color of a specific text could be changed.
I am working with an existing swing application with thousands of such components. I want to change the color of the link where ever it is used. Doing them one at a time would be very tedious. By default if a color is not specified swing seems to render them as blue.
How can I change this default to something else ?
246
To change the color of links in HTML, use the CSS property color. Use it with the style attribute. The style attribute specifies an inline style for an element. Use the style attribute with the CSS property color to change the link color.
Use CSS to Change Link Colors With this CSS, some browsers will change all aspects of the link (default, active, followed, and hover) to black, while others will change only the default color. Use a pseudo-class with a colon before the class name to change links in specific states. Four pseudo-classes affect links.
* This Java Swing program demonstrates how to create a hyperlink. Mouse the mouse over the link and you see it is underlined and brighter. Click the link and the default browser will be launched to open the hyperlink. * A hyperlink component that is based on JLabel.
So, after much digging through code I've learnt...
HTMLEditorKit and associated APIsHTMLEditorKit is maintain centrally/globally within the AppContext...From HTMLEditorKit#getStyleSheet
AppContext appContext = AppContext.getAppContext();
StyleSheet defaultStyles = (StyleSheet) appContext.get(DEFAULT_STYLES_KEY);
This is kind of important as it means, you don't spend a lot of time running about trying to look at the label's look and feel code AND you should be able to change the global style sheet in a single place and affect how everything gets rendered...this may be a good and a bad thing...
The next problem is, you can't actually access the StyleSheet within the AppContext as the DEFAULT_STYLES_KEY is a private static final Object...
This means you have to create an instance HTMLEditorKit and use getStyleSheet to get a reference to it...
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.text.html.HTMLEditorKit;
import javax.swing.text.html.StyleSheet;
import sun.awt.AppContext;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
HTMLEditorKit kit = new HTMLEditorKit();
StyleSheet styleSheet = kit.getStyleSheet();
styleSheet.addRule("a {color:#ff0000;}");
JLabel label = new JLabel("<html><a href=http://stackoverflow.com/questions/tagged/java>Stackoverflow</a></html>");
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(label);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}
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