TableCellRenderer和TableCellEditor(一)

 转载：http://blog.sina.com.cn/s/blog_661a3fce0100mske.html

最近不少朋友问我TableCellRenderer和TableCellEditor的用法，趁今天周末有空写了几个麻雀虽小五脏俱全的例子供大家参考。

简单来说：

TableCellRenderer就是用来绘制展示当前cell单元数值内容的，你可以用文字、数值或者图片来表示内容，当然最强大展示方式的就是通过自定义自己的renderer组件，通过Java2D来绘制各种天花乱坠的效果。

TableCellEditor主要是用来当用户点击在具体cell时进行编辑的组件，所以 TableCellEditor除了具有TableCellRenderer一样的绘制功能外还可以进行交互动作，例如在cell上出现下拉框、勾选框甚 至通过按钮弹出更复杂的对话框让用户进行输入编辑。

以下是在cell中嵌入start、stop两个按钮的表格，注意这里的renderer只是用来显示效果，并没有进行交互动作，真正进行动作的是当你将鼠标点击在cell上时，JTable定位上去的editor，所以不要徒劳在renderer上做点击事项处理，renderer是不会接受到交互事项的，renderer只是个画笔，你看到的start、stop按钮只是这个画笔画出来的内容，是虚的并没有真正的组件在上面。


import java.awt.*;
import java.awt.event.*;

import javax.swing.*;
import javax.swing.table.*;

public class TableTest1 extends JFrame {

 JTable table;
 String[] states = new String[]{"stop", "stop", "stop"};
 
 // model
 class TableModel extends AbstractTableModel{
  public int getColumnCount() {
   return 2;
  }
  public int getRowCount() {
   return states.length;
  }
  public Object getValueAt(int rowIndex, int columnIndex) {
   if(columnIndex == 0){
    return states[rowIndex];
   }
   return null;
  }
     public String getColumnName(int columnIndex) {
   if(columnIndex == 0){
    return "state";
   }else{
    return "operate";
   }
     }
     public boolean isCellEditable(int rowIndex, int columnIndex) {
   if(columnIndex == 0){
    return false;
   }else{
    return true;
   }
     }
 }
 
 // cell editor
 class Editor extends AbstractCellEditor implements TableCellEditor, ActionListener {
  int row;
  JTable table;
  JPanel panel;
  JButton start;
  JButton stop;
  Editor(){
   panel = new JPanel();
   panel.setLayout(new GridLayout(1, 2));
   start = new JButton("start");
   stop = new JButton("stop");
   start.addActionListener(this);
   stop.addActionListener(this);
   panel.add(start);
   panel.add(stop);
  }
     public Object getCellEditorValue() {
         return null;
     }
     public Component getTableCellEditorComponent(JTable table,
                                                  Object value,
                                                  boolean isSelected,
                                                  int row,
                                                  int column) {
      this.table = table;
      this.row = row;
      return panel;
     }
    
  public void actionPerformed(ActionEvent e) {
   if(e.getSource() == start){
    states[row] = "start";
   }else{
    states[row] = "stop";
   }
   ((AbstractTableModel)table.getModel()).fireTableCellUpdated(row, 0);
  }
  
 }
 
 // cell render
 class Renderer extends JComponent implements TableCellRenderer{
  JPanel panel;
  JButton start;
  JButton stop;
  Renderer(){
   panel = new JPanel();
   panel.setLayout(new GridLayout(1, 2));
   start = new JButton("start");
   stop = new JButton("stop");
   panel.add(start);
   panel.add(stop);
  }
  public Component getTableCellRendererComponent(JTable table, Object value,
    boolean isSelected, boolean hasFocus, int row, int column) {
   return panel;
  }
 }

 
 public TableTest1(){
  super("renderer and editor self-existent");
  table = new JTable(new TableModel());
  TableColumn tableColumn = table.getColumnModel().getColumn(1);
  tableColumn.setCellRenderer(new Renderer());
  tableColumn.setCellEditor(new Editor());
  
        this.getContentPane().setLayout(new BorderLayout());
        this.getContentPane().add(new JScrollPane(table), BorderLayout.CENTER);
        this.setSize(500, 300);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 }

 public static void main(String[] args) {
  new TableTest1().show();

 }

}