ColorAppend.java

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package burrowswheeler;

/**
 *
 * @author rumana
 */
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 ColorAppend 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
  }

}