JTextPane formatting

Question

I have a JTextPane where I want to add lines, and depending on their contents they have different formatting.

I currently have this

StyleContext context = new StyleContext(); StyledDocument document = new DefaultStyledDocument(context); Style styleBold = context.getStyle(StyleContext.DEFAULT_STYLE); StyleConstants.setBold(styleBold, true); StyleConstants.setFontSize(styleBold, 18); Style styleNorm = context.getStyle(StyleContext.DEFAULT_STYLE); StyleConstants.setFontSize(styleNorm, 15); for (int i = 0; i < temp.size(); i++) { String tmp = temp.get(i); if (tmp.substring(0, 2).equals(COMMENT_PREFIX)) { String addThis = " - " + tmp.substring(2); try { document.insertString(document.getLength(), addThis, styleNorm); } //CATCH } else if (tmp.substring(0, 2).equals(VERSION_PREFIX)) { Date d = new Date(System.currentTimeMillis()); String addThis = "Version: " + tmp.substring(2) + " - " + d.toString(); try { document.insertString(document.getLength(), addThis, styleBold); } //CATCH } try { document.insertString(document.getLength(), "\n", styleNorm); } //CATCH } 

I pulled out catch statements to reduce the size of the code.

However, this is all my text using styleNorm . Is it because the latter is called Style and they overwrite each other? If so, how to fix it?

Answer 1

Also discussed here , TextComponentDemo shows how to apply a number from StyleConstants , including font size, style, alignment, and color. Styles can be applied either directly to the Document , as shown in initAttributes() , or through StyledEditorKit actions, see here .

Appendix: The following example creates three related styles using SimpleAttributeSet . Note that highAlert changes color, but retains the bold attribute inherited from boldBlue .

 import java.awt.Color; import java.awt.EventQueue; import java.util.Date; import javax.swing.JFrame; import javax.swing.JTextPane; import javax.swing.text.BadLocationException; import javax.swing.text.SimpleAttributeSet; import javax.swing.text.StyleConstants; import javax.swing.text.StyledDocument; /** * @see https://stackoverflow.com/a/15600689/230513 */ public class Test { private void display() throws BadLocationException { JFrame f = new JFrame("Test"); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); String s = new Date().toString(); JTextPane jtp = new JTextPane(); StyledDocument doc = (StyledDocument) jtp.getDocument(); SimpleAttributeSet normal = new SimpleAttributeSet(); StyleConstants.setFontFamily(normal, "SansSerif"); StyleConstants.setFontSize(normal, 16); SimpleAttributeSet boldBlue = new SimpleAttributeSet(normal); StyleConstants.setBold(boldBlue, true); StyleConstants.setForeground(boldBlue, Color.blue); SimpleAttributeSet highAlert = new SimpleAttributeSet(boldBlue); StyleConstants.setFontSize(highAlert, 18); StyleConstants.setItalic(highAlert, true); StyleConstants.setForeground(highAlert, Color.red); doc.insertString(doc.getLength(), s + "\n", normal); doc.insertString(doc.getLength(), s + "\n", boldBlue); doc.insertString(doc.getLength(), s + "\n", highAlert); f.add(jtp); f.pack(); f.setLocationRelativeTo(null); f.setVisible(true); } public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { new Test().display(); } catch (BadLocationException ex) { ex.printStackTrace(System.err); } } }); } }