Extension of JTextPane that allows the user to easily append colored text to the document : TextPane « Swing JFC « Java

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Java » Swing JFC » TextPaneScreenshots 
Extension of JTextPane that allows the user to easily append colored text to the document
Extension of JTextPane that allows the user to easily append colored text to the document
   
/*
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly 
*/
// ColorPane.java
//A simple extension of JTextPane that allows the user to easily append
//colored text to the document.
//

import java.awt.Color;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
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 ColorPane extends JTextPane {

  public void appendNaive(Color c, String s) { // naive implementation
    // bad: instiantiates a new AttributeSet object on each call
    SimpleAttributeSet aset = new SimpleAttributeSet();
    StyleConstants.setForeground(aset, c);

    int len = getText().length();
    setCaretPosition(len)// place caret at the end (with no selection)
    setCharacterAttributes(aset, false);
    replaceSelection(s)// there is no selection, so inserts at caret
  }

  public void append(Color c, String s) { // better implementation--uses
                      // StyleContext
    StyleContext sc = StyleContext.getDefaultStyleContext();
    AttributeSet aset = sc.addAttribute(SimpleAttributeSet.EMPTY,
        StyleConstants.Foreground, c);

    int len = getDocument().getLength()// same value as
                       // getText().length();
    setCaretPosition(len)// place caret at the end (with no selection)
    setCharacterAttributes(aset, false);
    replaceSelection(s)// there is no selection, so inserts at caret
  }

  public static void main(String argv[]) {

    ColorPane pane = new ColorPane();
    for (int n = 1; n <= 400; n += 1) {
      if (isPrime(n)) {
        pane.append(Color.red, String.valueOf(n' ');
      else if (isPerfectSquare(n)) {
        pane.append(Color.blue, String.valueOf(n' ');
      else {
        pane.append(Color.black, String.valueOf(n' ');
      }
    }

    JFrame f = new JFrame("ColorPane example");
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setContentPane(new JScrollPane(pane));
    f.setSize(600400);
    f.setVisible(true);
  }

  public static boolean isPrime(int n) {
    if (n < 2)
      return false;
    double max = Math.sqrt(n);
    for (int j = 2; j <= max; j += 1)
      if (n % j == 0)
        return false// j is a factor
    return true;
  }

  public static boolean isPerfectSquare(int n) {
    int j = 1;
    while (j * j < n && j * j > 0)
      j += 1;
    return (j * j == n);
  }

}

           
         
    
    
  
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