TableCellRenderer & TableCellEditor（二）

上文的例子主要的动作在editor上，不过editor只有在点击在cell单元的时候才会显示，所以还不得不造一个界面跟editor一样的 renderer进行“造假”，当然由于这个例子只有两个按钮，所以renderer的代码不多，不过如果editor的组件很多，而且经常需要改动那不 就麻烦了，所以我们可以考虑一下让renderer复用editor的显示部分，以下的代码大家看看就明白：

import java.awt.*;

import java.awt.event.*;
import javax.swing.*;

import javax.swing.table.*;

public class TableTest2 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{

TableCellEditor editor;

Renderer(TableCellEditor
editor){

this.editor = editor;

}

public Component
getTableCellRendererComponent(JTable table, Object value,

boolean isSelected, boolean hasFocus, int
row, int column) {

return editor.getTableCellEditorComponent(table,
value, isSelected, row, column);

}

}

public TableTest2(){

super("editor used by renderer");

table = new JTable(new TableModel());

TableColumn tableColumn =
table.getColumnModel().getColumn(1);

tableColumn.setCellRenderer(new Renderer(new
Editor()));

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 TableTest2().show();
}
}