/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2011 by Rapid-I and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapid-i.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see http://www.gnu.org/licenses/.
 */
package com.rapidminer.gui.tools;

import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.JTextField;
import javax.swing.event.ChangeListener;


/**
 * A text field which allows to input (only) a single character.
 * 
 * @author Tobias Malbrecht
 */
public class CharTextField extends JTextField {

	private static final long serialVersionUID = 2226618111016685226L;
	
	public CharTextField() {
		super();
		addKeyListener(new KeyListener() {
			@Override
			public void keyPressed(KeyEvent e) {}
			
			@Override
			public void keyReleased(KeyEvent e) {
				setText(getText());
			}
			
			@Override
			public void keyTyped(KeyEvent e) {}
		});
		addMouseListener(new MouseAdapter() {
			public void mouseReleased(MouseEvent e) {
				super.mouseReleased(e);
				selectAll();
			}
		});
		addFocusListener(new FocusListener() {
			public void focusGained(FocusEvent e) {
				selectAll();
			}

			@Override
			public void focusLost(FocusEvent e) {

			}
		});
	}

	public CharTextField(char character) {
		this();
		setCharacter(character);
	}
	
	@Override
	public void setText(String text) {
		if (text.length() > 0) {
			super.setText(text.substring(text.length() - 1));
		}
		selectAll();		
	}
	
	public void setCharacter(char character) {
		super.setText(String.valueOf(character));
		selectAll();
	}
	
	public char getCharacter() {
		return getText().charAt(0);
	}
	
	public boolean isSet() {
		return getText().length() > 0;
	}
	
	public void addChangeListener(ChangeListener l) {
		
	}
}