eu.limetri.client.mapviewer.nb.jxmap.component.SelectionComponent Maven / Gradle / Ivy

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/**
 * Copyright (C) 2008-2012 AgroSense Foundation.
 *
 * AgroSense 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.
 *
 * There are special exceptions to the terms and conditions of the GPLv3 as it is applied to
 * this software, see the FLOSS License Exception
 * .
 *
 * AgroSense 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 AgroSense.  If not, see .
 */

package eu.limetri.client.mapviewer.nb.jxmap.component;

import java.awt.Component;
import javax.swing.JComboBox;
import javax.swing.JList;
import javax.swing.ListCellRenderer;

/**
 * Combo showing always one fixed value, allows select same item simultaneously.

 * This means, change listeners are fired with every selection.


 *
 * Acts like toolbar popup button.
 * 
 * @author Frantisek Post
 */
public class SelectionComponent extends JComboBox {
    
    public SelectionComponent(T fixedValue) {
        super();
        setEditable(false);
        setRenderer(new Renderer(getRenderer(), fixedValue));
    }

    @Override
    public void firePopupMenuWillBecomeInvisible() {
        super.firePopupMenuWillBecomeInvisible(); 
        setSelectedIndex(-1); //reset the selection
    }

    @Override
    public void firePopupMenuCanceled() {
        super.firePopupMenuCanceled(); 
        setSelectedIndex(-1); //reset the selection
    }
    
    private class Renderer implements ListCellRenderer {

        ListCellRenderer originalRenderer;
        T fixedValue;
        
        private Renderer(ListCellRenderer originalRenderer, T value) {
            this.originalRenderer = originalRenderer;
            this.fixedValue = value;
        }

        @Override
        public Component getListCellRendererComponent(JList list, T value, int index, boolean isSelected, boolean cellHasFocus) {
            Component component;
            
            if (index == -1) {
                component = originalRenderer.getListCellRendererComponent(list, fixedValue, index, isSelected, cellHasFocus);
            } else {
                component = originalRenderer.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
            }
            
            return component;
        }
        
    }
    
}