lwpasswordtext.java

Zaval Light-Weight Visual Components Library (LwVCL) is a pure Java alternative to humble AWT-based

/**
 *     Caption: Zaval Light-Weight Visual Components Library
 *     $Revision: 2.79 $
 *     $Date: 2003/08/22 11:24:16 $
 *
 *     @author:     Andrei Vishnevsky
 *     @version:    3.50
 *
 * Zaval Light-Weight Visual Components Library (LwVCL) is a pure Java
 * alternative to humble AWT-based and SWING-based GUI interfaces for
 * wide ranges of platforms, including J2SE, PersonalJava and J2ME.
 *
 * Designed as light-weight but, alternatively to Swing, built separately
 * from AWT (not on top of the java.awt library like Swing), the LwVCL is
 * the good alternative to highly performant, memory-efficient, flexible
 * GUI solution for embedded, stand-alone and applet applications.
 *
 * For more info on this product read Zaval Light-Weight Visual Components Library Tutorial
 * (It comes within this package).
 * The latest product version is always available from the product's homepage:
 * http://www.zaval.org/products/lwvcl/
 * and from the SourceForge:
 * http://sourceforge.net/projects/zaval0003/
 *
 * Contacts:
 *   Support : [e-mail]
 *   Change Requests : [e-mail]
 *   Feedback : [e-mail]
 *   Other : [e-mail]
 *
 * Copyright (C) 2001-2003  Zaval Creative Engineering Group (http://www.zaval.org)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * (version 2) as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */
package org.zaval.lw;

import org.zaval.data.*;

/**
 * This class inherits LwTextRender to represent a password text. For the purpose the
 * render uses an echo character.
 */
public class LwPasswordText
extends LwTextRender
{
  private char echo = '*';

 /**
  * Constructs the render with the specified target text model.
  * @param <code>text</code> the specified target text model.
  */
  public LwPasswordText(TextModel text) {
    super(text);
  }

 /**
  * Sets the specified echo character. The symbol will be used to render the text,
  * it means that every character of the text is render with the echo character.
  * @param <code>ch</code> the specified echo character.
  */
  public void setEchoChar (char ch)
  {
    if (echo != ch)
    {
      echo = ch;
      invalidate();
    }
  }

 /**
  * Gets the string presentation of the specified line. The method is overrided with
  * the class and it replaces every character of the given string with the echo character
  * and after that returns the string as a result.
  * @param <code>r</code> the specified line number.
  * @return a string line.
  */
  protected /*C#override*/ String getLine(int r)
  {
    String s = super.getLine(r);
    char[] buf = new char[s.length()];
    for (int i=0; i < buf.length; i++) buf[i] = echo;
    return new String(buf);
  }
}