Java Swing How to - Color only a portion of JTextpane

• Back to JTextPane  ↑

Question

We would like to know how to color only a portion of JTextpane.

Answer

import java.awt.Color;
/* w w  w  . j  a  va  2 s.  c  o  m*/
import javax.swing.JFrame;
import javax.swing.JTextPane;
import javax.swing.text.AttributeSet;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyleContext;

public class Main {
  private static void appendToPane(JTextPane tp, String msg, Color f, Color b) {
    StyleContext sc = StyleContext.getDefaultStyleContext();
    AttributeSet aset = sc.addAttribute(SimpleAttributeSet.EMPTY,
        StyleConstants.Foreground, f);
    aset = sc.addAttribute(aset, StyleConstants.Background, b);

    aset = sc.addAttribute(aset, StyleConstants.FontFamily, "Lucida Console");
    aset = sc.addAttribute(aset, StyleConstants.Alignment,
        StyleConstants.ALIGN_JUSTIFIED);

    int len = tp.getDocument().getLength();
    tp.setCaretPosition(len);
    tp.setCharacterAttributes(aset, false);
    tp.replaceSelection(msg);
  }

  public static void main(String... args) {
    JTextPane tPane = new JTextPane();
    JFrame f  = new JFrame();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    appendToPane(tPane, "this is a test.\n", Color.RED, Color.WHITE);
    appendToPane(tPane, "this is a test \n", Color.PINK,Color.BLUE);
    appendToPane(tPane, "test", Color.GRAY, Color.BLACK);
    appendToPane(tPane, "test", Color.RED, Color.BLUE);
    appendToPane(tPane, "test", Color.RED, Color.YELLOW);

    f.getContentPane().add(tPane);

    f.pack();
    f.setVisible(true);
  }
}

• Back to JTextPane  ↑