/*
Wotonomy: OpenStep design patterns for pure Java applications.
Copyright (C) 2001 Intersect Software Corporation

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library 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
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see http://www.gnu.org
*/

package net.wotonomy.ui.swing.components;

import java.awt.Color;
import java.awt.Component;

import javax.swing.JComponent;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableCellRenderer;

/**
 * A TableCellRenderer that wraps another TableCellRenderer and sets the
 * background to the specified color for odd-numbered rows. This makes every
 * other row appear to be a different color, which helps users distinguish rows
 * of data in densely-packed tables.
 *
 * @author michael@mpowers.net
 * @author $Author: cgruber $
 * @version $Revision: 904 $
 */
public class AlternatingRowCellRenderer implements TableCellRenderer {

	protected TableCellRenderer wrappedRenderer;
	protected Color alternateColor;

	/**
	 * Default constructor uses a lighter shade of the system control color and
	 * wraps a DefaultTableCellRenderer.
	 */
	public AlternatingRowCellRenderer() {
		this(new DefaultTableCellRenderer());
	}

	/**
	 * Uses the specified color for the background of the alternating rows, and
	 * wraps a DefaultTableCellRenderer.
	 */
	public AlternatingRowCellRenderer(Color aColor) {
		this(aColor, new DefaultTableCellRenderer());
	}

	/**
	 * Uses the uses a lighter shade of the system control color for the background
	 * of the alternating rows, and wraps the specified TableCellRenderer.
	 */
	public AlternatingRowCellRenderer(TableCellRenderer aRenderer) {
		Color c = UIManager.getColor("control");
		c = new Color( // lighten this color just slightly
				(int) (c.getRed() + ((255 - c.getRed()) / 1.5)), (int) (c.getGreen() + ((255 - c.getGreen()) / 1.5)),
				(int) (c.getBlue() + ((255 - c.getBlue()) / 1.5)));

		alternateColor = c;
		wrappedRenderer = aRenderer;
	}

	/**
	 * Uses the specified color for the background of the alternating rows, and
	 * wraps the specified TableCellRenderer.
	 */
	public AlternatingRowCellRenderer(Color aColor, TableCellRenderer aRenderer) {
		alternateColor = aColor;
		wrappedRenderer = aRenderer;
	}

	public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus,
			int row, int column) {
		Component result = wrappedRenderer.getTableCellRendererComponent(table, value, isSelected, hasFocus, row,
				column);
		if (!isSelected) {
			if (row % 2 == 0) {
				if (!result.getBackground().equals(table.getBackground())) {
					result.setBackground(table.getBackground());
				}
			} else {
				if (!result.getBackground().equals(alternateColor)) {
					// jdk1.3's default renderer is opaque
					if (result instanceof JComponent) {
						((JComponent) result).setOpaque(true);
					}

					result.setBackground(alternateColor);
				}
			}
		}
		return result;
	}
}