Application: gvSIG desktop

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2013 gvSIG Association.

 *

 * This program 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 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 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., 51 Franklin Street, Fifth Floor, Boston,

 * MA  02110-1301, USA.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.gui.beans.numberTextField;

import java.awt.event.FocusEvent;

import java.awt.event.FocusListener;

import java.text.ParseException;

/**

 * <p>Provides a TextField component suitable for numbers. No error is

 * produced when other characters are introduced, but just numbers are kept

 * in the field after pressing enter or after focus is lost.</p>

 * 

 * <p>The component parses numbers according to the default Locale. For example

 * when es_ES locale is active, a comma (",") is expected to separate the

 * fractional part from the integer part, and when en_US is the default locale,

 * then a dot (".") is expected to separate them.</p>

 * 

 * <p>The format of the accepted numbers can be modified by using the

 *  {@link #getFormat()} method. For example, to get a TextField that accepts

 *  just integer numbes we would use:</p>

 *  <pre>

 *    NumberTextField field = new NumberTextField();

 *    field.getFormat().setParseIntegerOnly(true);</pre>

 *  

 *  <p>In order to get a TextField that accepts double values with a minimum

 *  of two fractional digits and a maximum of five, we would use:</p>

 *  <pre>

 *    NumberTextField field = new NumberTextField();

 *    field.getFormat().setMinimumFractionDigits(0);

 *    field.getFormat().setMaximumFractionDigits(5);

 *  </pre>

 *  

 *  <p>NumberTextField commits the value to the Field when the focus is lost,

 *  while standard JFormattedTextField just commits the value to the Field

 *  when the user presses ENTER.</p>

 */

public class PositiveNumberField extends NumberTextField

        implements FocusListener{

        private static final long serialVersionUID = 1289959692215502516L;

        public PositiveNumberField() {

        super();

        initialize();

        }

        public PositiveNumberField(int columns) {

                super(columns);

                initialize();

        }

        public PositiveNumberField(double value, int columns) {

                super(value, columns);

                initialize();

        }

        public PositiveNumberField(int value, int columns) {

                super(value, columns);

                initialize();

        }

        private void initialize() {

                addFocusListener(this);

                getFormat().setParseIntegerOnly(true);

                getFormat().setGroupingUsed(false);

        }

        public void focusLost(FocusEvent e) {

                try {

                        commitEdit();

                } catch (ParseException e1) {}

                if (getIntValue()<0) {

                        setValue(-getIntValue());

                }

        }

}