Java Document Paragraph Colors

Question

Hi,
I want to change Background color of Styled Document. I am able to change text color through
StyleConstants.setForeground(styles, Color,RED);
Its changing background color for text. If text ends at middle of line then color applied to half line only. I need complete line to be colored. How to apply this with StyleConstants.
I also want to apply Different color effects to different paragraphs. How to achieve this.
StyleConstants.setForeground(styles, getForeground());
        StyleConstants.setBackground(styles, Color.RED);             
        doc.insertString(doc.getLength(), text, styles);waiting for your replies.

Answer 1

I need complete line to be colored. How to apply this with StyleConstants. I don't know how to do this with StyleConstants. However, you should be able to use a highlighter. See how the setDrawsLayeredHighlights(...) method affects the painting of highlights:
import java.awt.*;
import javax.swing.*;
import javax.swing.text.*;
public class Highlighting extends JFrame
     public Highlighting()
          String text = "one\ntwo\nthree\nfour\nfive";
          Dimension d = new Dimension(200, 200);
          JTextArea textArea1 = new JTextArea();
          textArea1.setPreferredSize(d);
          textArea1.setText( text );
          JTextArea textArea2 = new JTextArea();
          textArea2.setPreferredSize(d);
          textArea2.setText( text );
          JPanel north = new JPanel();
          north.add(textArea1);
          north.add(textArea2);
          getContentPane().add(north, BorderLayout.NORTH);
          JTextPane textPane1 = new JTextPane();
          textPane1.setPreferredSize(d);
          textPane1.setText( text );
          JTextPane textPane2 = new JTextPane();
          textPane2.setPreferredSize(d);
          textPane2.setText( text );
          JPanel south = new JPanel();
          south.add(textPane1);
          south.add(textPane2);
          getContentPane().add(south, BorderLayout.SOUTH);
          DefaultHighlighter highlighter1 =  (DefaultHighlighter)textArea2.getHighlighter();
          highlighter1.setDrawsLayeredHighlights(false);
          DefaultHighlighter highlighter2 =  (DefaultHighlighter)textPane2.getHighlighter();
          highlighter2.setDrawsLayeredHighlights(false);
          Highlighter.HighlightPainter yellow = new DefaultHighlighter.DefaultHighlightPainter( Color.YELLOW );
          try
               textArea1.getHighlighter().addHighlight(4, 8, yellow);
               textArea2.getHighlighter().addHighlight(4, 8, yellow);
               textPane1.getHighlighter().addHighlight(4, 8, yellow);
               textPane2.getHighlighter().addHighlight(4, 8, yellow);
               textArea1.getHighlighter().addHighlight(16, 18, yellow);
               textArea2.getHighlighter().addHighlight(16, 18, yellow);
               textPane1.getHighlighter().addHighlight(16, 18, yellow);
               textPane2.getHighlighter().addHighlight(16, 18, yellow);
          catch(BadLocationException ble) {}
     public static void main(String[] args)
          JFrame frame = new Highlighting();
          frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
          frame.setSize(500, 450);
          frame.setLocationRelativeTo( null );
          frame.setVisible(true);
}Also, try selecting all the text with the mouse to see how the selection highlighting is different in each case.