/* 
 * This file is part of the Echo2 Table Extension (hereinafter "ETE").
 * Copyright (C) 2002-2005 NextApp, Inc.
 *
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 */
package echopointng.table;

import nextapp.echo2.app.Alignment;
import nextapp.echo2.app.Button;
import nextapp.echo2.app.Color;
import nextapp.echo2.app.Component;
import nextapp.echo2.app.ImageReference;
import nextapp.echo2.app.Insets;
import nextapp.echo2.app.LayoutData;
import nextapp.echo2.app.ResourceImageReference;
import nextapp.echo2.app.Table;
import nextapp.echo2.app.event.ActionEvent;
import nextapp.echo2.app.event.ActionListener;
import nextapp.echo2.app.layout.TableLayoutData;
import nextapp.echo2.app.table.TableCellRenderer;

/**
 * Default renderer for <code>SortableTableModel</code> backed 
 * Tables.
 * 
 * @author Jason Dalton
 */
public class SortableTableHeaderRenderer implements TableCellRenderer {
	
	private static final ImageReference upArrowImage = new ResourceImageReference("/echopointng/resource/images/ArrowUp.gif");
	private static final ImageReference downArrowImage = new ResourceImageReference("/echopointng/resource/images/ArrowDown.gif");
    
    /**
     * @see nextapp.echo2.app.table.TableCellRenderer#getTableCellRendererComponent(nextapp.echo2.app.Table, java.lang.Object, int, int)
     */
    public Component getTableCellRendererComponent(Table table, Object value, int column, int row) {
        SortableTableModel model = (SortableTableModel)table.getModel();
        return getSortButton((String)value,column,model);
    }
    
    protected Button getSortButton(String label, int column, SortableTableModel model) {
        Button button = new Button(label);
        button.addActionListener(getSortButtonListener(column,model));
        button.setLayoutData(getLayoutData());
        button.setInsets(new Insets(5,5));
        button.setTextPosition(new Alignment(Alignment.LEFT, Alignment.DEFAULT));
        
        ImageReference icon = null;
        if (model.getCurrentSortColumn() == column) {
            if (model.isCurrentSortAscending()){
                icon = upArrowImage;
            } else {
                icon = downArrowImage;
            }
            button.setIcon(icon);
        }
        
        return button;
    }
    
    protected LayoutData getLayoutData() {
        TableLayoutData data = new TableLayoutData();
        data.setBackground(new Color(175,175,239));
        return data;
    }
    
    protected ActionListener getSortButtonListener(final int column, final SortableTableModel model) {
        return new ActionListener() {            
            public void actionPerformed(ActionEvent e) {
                boolean ascending = model.isCurrentSortAscending();
                model.sortByColumn(column,!ascending);
            }
        };
    }
}
