The complete code for the StyledTextArea component.

COMPONENT JAVA
AWT Styled Text Component

Budi Kurniawan
Listing 1. The complete code for the StyledTextArea component.


import java.awt.*;
import java.util.*;

public class myCanvas extends Canvas {

  private static Vector lines = new
    Vector();
  private static Vector fonts = new
    Vector();
  private static Vector colors = new
     Vector();
  int width;
  int leftMargin = 5;
  int textHeight = 0;
  private Color bgColor = Color.red;

  public myCanvas(int width) {
    this.width = width;
  }

  public void paint(Graphics g){
    int y = 0;
    for (int i=0; i<lines.size(); i++) {
      g.setColor((Color)
        colors.elementAt(i));
      g.setFont((Font) fonts.elementAt(i));
      FontMetrics fontMetrics =
        g.getFontMetrics();
      y += fontMetrics.getHeight();
      g.drawString((String)
        lines.elementAt(i), leftMargin, y);
    }

  } // end of paint

  public void append(String str, Font font,
    Color color) {
    fonts.addElement(font);
    colors.addElement(color);
    setFont(font);
    FontMetrics fontMetrics =
      getFontMetrics(font);
    textHeight += fontMetrics.getHeight();

    setBounds(0, 0, width, textHeight +
      fontMetrics.getDescent());
    int stringLength = str.length();
    int stringWidth =
      fontMetrics.stringWidth(str);
    int position = stringLength;

    char ch = 0;
    boolean loop=true;
    while ((stringWidth > (width-
      2*leftMargin)) && (position>0)) {
      while (ch!=' ' && position>0) {
        ch = str.charAt(--position);
      }
      // a very long word
      if (position==0) {
        position = stringLength;
        while (stringWidth > width-
          2*leftMargin) {
          stringWidth =           
            fontMetrics.stringWidth(
            str.substring(0, position--));
        }
      }
      else {
        stringWidth = 
          fontMetrics.stringWidth(
          str.substring(0, position));
        ch = 0;
      }
    }

    lines.addElement(str.substring(0,
      position));
    if (position!=stringLength)
      append(str.substring(position).trim(),
        font, color);

    /* this, called from here, does not work
       in IE but works in Netscape
    this.getParent().doLayout();
    */

    repaint();
  }
}

About the Author

Budi Kurniawan is an independent consultant who is currently working on a project for Kidz.net Ltd. in Sydney, Australia. He can be contacted at BudiK@au.kidz.net.

Featured

Most   Popular
Upcoming Events

AppTrends

Sign up for our newsletter.

Terms and Privacy Policy consent

I agree to this site's Privacy Policy.