| gvSIG desktop 1

/*

 * Created on 10-abr-2006

 *

 * 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

 */

/* CVS MESSAGES:

*

* $Id: 

* $Log: 

*/

package org.gvsig.gui;

import java.awt.Component;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.Vector;

import javax.swing.ComboBoxModel;

import javax.swing.JComboBox;

import javax.swing.JLabel;

import javax.swing.JList;

import javax.swing.ListCellRenderer;

import javax.swing.UIManager;

import javax.swing.border.EmptyBorder;

/**

 * Implementation of JComboBox that allows us to enable/disable

 * individual items of the JComboBox.

 * 

 * Based in the work of Nobuo Tamemasa, in 

 * http://www.codeguru.com/java/articles/165.shtml

 * 

 * 

 * @author Alvaro Zabala

 *

 */

public class JComboBoxWithDisabledItems extends JComboBox {

        private static final long serialVersionUID = -1375989245835223722L;

        public JComboBoxWithDisabledItems(){

                super();

//                initialize();

        }

        public JComboBoxWithDisabledItems(ComboBoxModel model){

                super(model);

                initialize();

        }

        public JComboBoxWithDisabledItems(Object[] items){

                super(items);

                initialize();

        }

        public JComboBoxWithDisabledItems(Vector<?> items){

                super(items);

                initialize();

        }

        public void initialize(){

                setRenderer(new ComboRenderer());

            addActionListener(new ComboListener(this));

        }

        public void addItem(Object item){

                if(item instanceof ComboItem){

                        super.addItem(item);

                }else{

                        ComboItem newItem = new ComboItem(item);

                        newItem.setEnabled(true);

                        super.addItem(newItem);

                }

        }

        public Object getItemAt(int index){

                ComboItem item = (ComboItem) super.getItemAt(index);

                return item.obj;

        }

        public Object getSelectedItem(){

                ComboItem item = (ComboItem) super.getSelectedItem();

                return item.obj;

        }

        public void setItemEnable(int index, boolean enabled){

                ComboItem item = (ComboItem) super.getItemAt(index);

                item.isEnable = enabled;

        }

        public boolean isItemEnabled(int index){

                if(index >= 0){

                        ComboItem item = (ComboItem) super.getItemAt(index);

                        return item.isEnable;

                }else

                        return false;

        }

        /**

         * Combo box renderer.

         * 

         * @author Alvaro Zabala

         *

         */

        class ComboRenderer extends JLabel implements ListCellRenderer {

                private static final long serialVersionUID = 4216706963467674095L;

                public ComboRenderer() {

              setOpaque(true);

              setBorder(new EmptyBorder(1, 1, 1, 1));

            }

            public Component getListCellRendererComponent( JList list, 

                   Object value, int index, boolean isSelected, boolean cellHasFocus) {

              if (isSelected) {

                setBackground(list.getSelectionBackground());

                setForeground(list.getSelectionForeground());

              } else {

                setBackground(list.getBackground());

                setForeground(list.getForeground());

              } 

//              if (! ((ComboItem)value).isEnabled()) {

              if(! isItemEnabled(index)){

                setBackground(list.getBackground());

                setForeground(UIManager.getColor("Label.disabledForeground"));

              }else{

                      setBackground(list.getBackground());

                      setForeground(list.getForeground());

              }

              setFont(list.getFont());

              setText((value == null) ? "" : value.toString());

              return this;

            }

          }

        /**

         * Listens for combo box selection events.

         * 

         * It the new selected items are not enabled, the combo box

         * will remain unchanged.

         * 

         * @author Alvaro Zabala

         *

         */

          class ComboListener implements ActionListener {

            JComboBox combo;

            Object currentItem;

            ComboListener(JComboBox combo) {

              this.combo  = combo;

              combo.setSelectedIndex(0);

              currentItem = combo.getSelectedItem();

            }

            public void actionPerformed(ActionEvent e) {

              Object tempItem = combo.getSelectedItem();

              int selectedIndex = combo.getSelectedIndex();

              //If the selected item in the combo box is enable,

              //the combo will change. If not, the selected item

              //will be the previous selected item

//              if (! ((ComboItem)tempItem).isEnabled()) {

              if(isItemEnabled(selectedIndex)){

                combo.setSelectedItem(currentItem);

              } else {

                currentItem = tempItem;

              }

            }

          }//ComboListener

          /**

           * Combo box item that allows to enabling / disabling combo 

           * box entries.

           * 

           * @author Alvaro Zabala

           *

           */

          class ComboItem  {

            Object  obj;

            boolean isEnable;

            ComboItem(Object obj,boolean isEnable) {

              this.obj      = obj;

              this.isEnable = isEnable;

            }

            ComboItem(Object obj) {

              this(obj, true);

            }

            public boolean isEnabled() {

              return isEnable;

            }

            public void setEnabled(boolean isEnable) {

              this.isEnable = isEnable;

            }

            public String toString() {

              return obj.toString();

            }

          }

}