source: trunk/gcc/libjava/java/awt/TextComponent.java@ 3254

/* TextComponent.java -- Widgets for entering text
   Copyright (C) 1999, 2002 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Classpath 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 GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module.  An independent module is a module which is not derived from
or based on this library.  If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so.  If you do not wish to do so, delete this
exception statement from your version. */


package java.awt;

import java.awt.event.TextEvent;
import java.awt.event.TextListener;
import java.awt.peer.TextComponentPeer;
import java.awt.peer.ComponentPeer;

/**
  * This class provides common functionality for widgets than 
  * contain text.
  *
  * @author Aaron M. Renn ([email protected])
  */
public class TextComponent extends Component implements java.io.Serializable
{

/*
 * Static Variables
 */

// Constant for serialization
private static final long serialVersionUID = -2214773872412987419L;

/*
 * Instance Variables
 */

/**
  * @serial Indicates whether or not this component is editable.
  */
private boolean editable;

/**
  * @serial The starting position of the selected text region.
  */
private int selectionStart;

/**
  * @serial The ending position of the selected text region.
  */
private int selectionEnd;

/**
  * @serial The text in the component
  */
private String text;

/**
  * A list of listeners that will receive events from this object.
  */
protected transient TextListener textListener;

/*************************************************************************/

/*
 * Constructors
 */

TextComponent(String text)
{
  this.text = text;
  this.editable = true;
}

/*************************************************************************/

/*
 * Instance Methods
 */

/**
  * Returns the text in this component
  *
  * @return The text in this component.
  */
public synchronized String
getText()
{
  TextComponentPeer tcp = (TextComponentPeer)getPeer();
  if (tcp != null)
    text = tcp.getText();

  return(text);
}

/*************************************************************************/

/**
  * Sets the text in this component to the specified string.
  *
  * @param text The new text for this component.
  */
public synchronized void
setText(String text)
{
  if (text == null)
    text = "";

  this.text = text;

  TextComponentPeer tcp = (TextComponentPeer)getPeer();
  if (tcp != null)
    tcp.setText(text);
}

/*************************************************************************/

/**
  * Returns a string that contains the text that is currently selected.
  *
  * @return The currently selected text region.
  */
public synchronized String
getSelectedText()
{
  String alltext = getText();
  int start = getSelectionStart();
  int end = getSelectionEnd();
  
  return(alltext.substring(start, end));
}

/*************************************************************************/

/**
  * Returns the starting position of the selected text region.
  * // FIXME: What is returned if there is no selected text?
  *
  * @return The starting position of the selected text region.
  */
public synchronized int
getSelectionStart()
{
  TextComponentPeer tcp = (TextComponentPeer)getPeer();
  if (tcp != null)
    selectionStart = tcp.getSelectionStart();

  return(selectionStart);
}

/*************************************************************************/

/**
  * Sets the starting position of the selected region to the
  * specified value.  If the specified value is out of range, then it
  * will be silently changed to the nearest legal value.
  *
  * @param selectionStart The new start position for selected text.
  */
public synchronized void
setSelectionStart(int selectionStart)
{
  select(selectionStart, getSelectionEnd());
}

/*************************************************************************/

/**
  * Returns the ending position of the selected text region.
  * // FIXME: What is returned if there is no selected text.
  *
  * @return The ending position of the selected text region.
  */
public synchronized int
getSelectionEnd()
{