Application: gvSIG desktop

/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana

 *

 * Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.

 *

 * 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 2

 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

 *

 * For more information, contact:

 *

 *  Generalitat Valenciana

 *   Conselleria d'Infraestructures i Transport

 *   Av. Blasco Ib??ez, 50

 *   46010 VALENCIA

 *   SPAIN

 *

 *      +34 963862235

 *   gvsig@gva.es

 *      www.gvsig.gva.es

 *

 *    or

 *

 *   IVER T.I. S.A

 *   Salamanca 50

 *   46005 Valencia

 *   Spain

 *

 *   +34 963163400

 *   dac@iver.es

 */

package com.iver.utiles.swing;

import java.awt.event.ActionEvent;

import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;

import java.util.Vector;

import javax.swing.ComboBoxModel;

import javax.swing.DefaultComboBoxModel;

import javax.swing.JTextField;

import javax.swing.plaf.basic.BasicComboBoxEditor;

/**

 * ComboBox autocompletable

 *

 * @author Fernando Gonz?lez Cort?s

 */

public class JComboBox extends javax.swing.JComboBox {

    /**

     * Construye un combobox

     */

    public JComboBox() {

        super();

        init();

    }

    /**

     * Construye un combobox

     *

     * @param arg0

     */

    public JComboBox(Object[] arg0) {

        super(arg0);

        init();

    }

    /**

     * Construye un combobox

     *

     * @param arg0

     */

    public JComboBox(Vector arg0) {

        super(arg0);

        init();

    }

    /**

     * Construye un combobox

     *

     * @param arg0

     */

    public JComboBox(ComboBoxModel arg0) {

        super(arg0);

        init();

    }

    /**

     * Inicializa el combo

     */

    private void init() {

        this.setEditor(new BasicComboBoxEditor());

        JTextField jtext = (JTextField) JComboBox.this.getEditor()

                                                      .getEditorComponent();

        jtext.addKeyListener(new MyKeyListener());

        jtext.setText("");

    }

    /**

     * Manejador de los eventos Key para hacer el autocompletado

     *

     * @author Fernando Gonz?lez Cort?s

     */

    public class MyKeyListener implements KeyListener {

        private int lastCaretPosition = 0;

        private String lastText = "";

        private boolean bAutocompletar=true;

        /**

         * Devuelve dada una String, la String del modelo que empieza por dicha

         * String si hay alguna, o null si no hay ninguna

         *

         * @param text texto que se busca en el modelo

         *

         * @return String del modelo o null

         */

        private String isInModel(String text) {

            DefaultComboBoxModel model = (DefaultComboBoxModel) JComboBox.this.getModel();

            for (int i = 0; i < model.getSize(); i++) {

                if ((model.getElementAt(i).toString()).startsWith(text)) {

                    return model.getElementAt(i).toString();

                }

            }

            return null;

        }

        /**

         * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)

         */

        public void actionPerformed(ActionEvent arg0) {

            JTextField jtext = (JTextField) JComboBox.this.getEditor()

                                                          .getEditorComponent();

            String texto = jtext.getText();

            String text = isInModel(texto);

            if (text != null) {

                int caretPos = texto.length();

                jtext.setText(text);

                jtext.setCaretPosition(caretPos);

                jtext.setSelectionStart(caretPos);

                jtext.setSelectionEnd(text.length());

            }

        }

        /**

         * @see java.awt.event.KeyListener#keyPressed(java.awt.event.KeyEvent)

         */

        public void keyPressed(KeyEvent e) {

            JTextField jtext = (JTextField) JComboBox.this.getEditor()

                                                          .getEditorComponent();

            bAutocompletar = true;

            if ((e.getKeyCode() == KeyEvent.VK_BACK_SPACE)

                    || (e.getKeyCode() == KeyEvent.VK_DELETE))

            {

                bAutocompletar = false;

                /* if ((lastCaretPosition >=0) && 

                        (lastCaretPosition <= jtext.getText().length()))

                                jtext.setCaretPosition(lastCaretPosition); */

            }

        }

        /**

         * @see java.awt.event.KeyListener#keyReleased(java.awt.event.KeyEvent)

         */

        public void keyReleased(KeyEvent e) {

            JTextField jtext = (JTextField) JComboBox.this.getEditor()

                                                          .getEditorComponent();

            String texto = jtext.getText().substring(0, jtext.getCaretPosition());

            if (!bAutocompletar) return;

            String text = isInModel(texto);

            if (!jtext.getText().equals(lastText) && (text != null)) {

                int caretPos = texto.length();

                jtext.setText(text);

                jtext.setCaretPosition(text.length());

                jtext.moveCaretPosition(caretPos);

                lastText = text;

                lastCaretPosition = caretPos;

                JComboBox.this.setSelectedItem(text);

            } else {

                lastCaretPosition = jtext.getCaretPosition();

            }

        }

        /**

         * @see java.awt.event.KeyListener#keyTyped(java.awt.event.KeyEvent)

         */

        public void keyTyped(KeyEvent e) {

        }

    }

}