label.java

java telnet 服务器实现 .

//License
/***
 * Java TelnetD library (embeddable telnet daemon)
 * Copyright (c) 2000-2005 Dieter Wimberger 
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the author nor the names of its contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 *  
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS ``AS
 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 * POSSIBILITY OF SUCH DAMAGE.
 ***/

package net.wimpi.telnetd.io.toolkit;

import net.wimpi.telnetd.io.BasicTerminalIO;
import net.wimpi.telnetd.io.terminal.ColorHelper;

import java.io.IOException;

/**
 * Class that represents a label.
 *
 * @author Dieter Wimberger
 * @version 2.0 (16/07/2006)
 */
public class Label extends InertComponent {

  //Members
  private String m_Content;

  /**
   * Constructs a Label instance.
   *
   * @param io   Instance of a class implementing the BasicTerminalIO interface.
   * @param name String that represents the components name.
   * @param text String that represents the visible label.
   */
  public Label(BasicTerminalIO io, String name, String text) {
    super(io, name);
    setText(text);
  }//constructor

  /**
   * Constructs a Label instance, using the name as visible content.
   *
   * @param io   Instance of a class implementing the BasicTerminalIO interface.
   * @param name String that represents the components name.
   */
  public Label(BasicTerminalIO io, String name) {
    super(io, name);
    setText(name);
  }//constructor

  /**
   * Mutator method for the text property of the label component.
   *
   * @param text String displayed on the terminal.
   */
  public void setText(String text) {
    //set member
    m_Content = text;
    //set Dimensions
    m_Dim = new Dimension((int) ColorHelper.getVisibleLength(text), 1);

  }//setText

  /**
   * Accessor method for the text property of the label component.
   *
   * @return String that is displayed when the label is drawn.
   */
  public String getText() {
    return m_Content;
  }//getText


  /**
   * Method that draws the label on the screen.
   */
  public void draw() throws IOException {
    if (m_Position == null) {
      m_IO.write(m_Content);
    } else {
      m_IO.storeCursor();
      m_IO.setCursor(m_Position.getRow(), m_Position.getColumn());
      m_IO.write(m_Content);
      m_IO.restoreCursor();
      m_IO.flush();
    }
  }//draw


}//class Label