testtablecellrenderer.java

疯狂Java讲义_源码(含Java设计模式CHM

import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
import java.io.*;
/**
 * Description:
 * <br/>Copyright (C), 2005-2008, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee [e-mail]
 * @version  1.0
 */
public class TestTableCellRenderer
{
	JFrame jf = new JFrame("使用单元格绘制器");
	JTable table;
	//定义二维数组作为表格数据
	Object[][] tableData = 
	{
		new Object[]{"李清照" , 29 , "女" , new ImageIcon("icon/3.gif") , true},
		new Object[]{"苏格拉底", 56 , "男" , new ImageIcon("icon/1.gif") , false},
		new Object[]{"李白", 35 , "男" , new ImageIcon("icon/4.gif")  , true},
		new Object[]{"弄玉", 18 , "女" , new ImageIcon("icon/2.gif")  , true},
		new Object[]{"虎头" , 2 , "男" , new ImageIcon("icon/5.gif") , true}
	};
	//定义一维数据作为列标题
	String[] columnTitle = {"姓名" , "年龄" , "性别" , "主头像" , "是否中国人"};
	public void init()
	{
		//以二维数组和一维数组来创建一个ExtendedTableModel对象
		ExtendedTableModel model = new ExtendedTableModel(columnTitle , tableData);
		//以ExtendedTableModel来创建JTable
		table = new JTable( model);
		table.setRowSelectionAllowed(false);
		table.setRowHeight(40);
		//获取第三列
		TableColumn lastColumn = table.getColumnModel().getColumn(2);
		//对第三列采用自定义的单元格绘制器
		lastColumn.setCellRenderer(new GenderTableCellRenderer());

		//将JTable对象放在JScrollPane中，并将该JScrollPane放在窗口中显示出来
		jf.add(new JScrollPane(table));
		jf.pack();
		jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		jf.setVisible(true);
	}
    public static void main(String[] args) 
    {
		new TestTableCellRenderer().init();
    }
}

class ExtendedTableModel extends DefaultTableModel
{
	//重新提供一个构造器，该构造器的实现委托给DefaultTableModel父类
	public ExtendedTableModel(String[] columnNames , Object[][] cells)
	{
		super(cells , columnNames);
	}
	//重写getColumnClass方法，根据每列的第一个值来返回其真实的数据类型
	public Class getColumnClass(int c) 
	{
		return getValueAt(0 , c).getClass();
	}
}

class GenderTableCellRenderer extends JPanel implements TableCellRenderer
{
	private String cellValue;
	//定义图标的宽度和高度
	final int ICON_WIDTH = 23;
	final int ICON_HEIGHT = 21;
	public Component getTableCellRendererComponent(JTable table, Object value, 
		boolean isSelected, boolean hasFocus, int row, int column)
	{
		cellValue = (String)value;
		//设置选中状态下绘制边框
		if (hasFocus)
		{
			setBorder(UIManager.getBorder("Table.focusCellHighlightBorder"));
		}
		else
		{
			setBorder(null);
		}
		return this;
	}
	//重写paint方法，负责绘制该单元格内容
	public void paint(Graphics g)
	{
		//如果表格值为"男"或"male"，则绘制一个男性图标
		if (cellValue.equalsIgnoreCase("男") 
			|| cellValue.equalsIgnoreCase("male"))
		{
			drawImage(g , new ImageIcon("icon/male.gif").getImage()); 
		}
		//如果表格值为"女"或"female"，则绘制一个女性图标
		if (cellValue.equalsIgnoreCase("女") 
			|| cellValue.equalsIgnoreCase("female"))
		{
			drawImage(g , new ImageIcon("icon/female.gif").getImage()); 
		}
	}
	//绘制图标的方法
	private void drawImage(Graphics g , Image image)
	{
		g.drawImage(image, (getWidth() - ICON_WIDTH ) / 2 
			, (getHeight() - ICON_HEIGHT) / 2 , null);
	}
}