Author: Nobuo Tamemasa

Display a JButton in a cell and allow editing the button text.

The three files are listed below. JButtonTableExample show you how to use the ButtonRenderer and ButtonEditor classes.

// File: JButtonTableExample.java
/* (swing1.1beta3) */
//package jp.gr.java_conf.tame.swing.examples;

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

import jp.gr.java_conf.tame.swing.table.*;


/**
 * @version 1.0 11/09/98
 */
public class JButtonTableExample extends JFrame {

  public JButtonTableExample(){
    super( "JButtonTable Example" );
    
    DefaultTableModel dm = new DefaultTableModel();
    dm.setDataVector(new Object[][]{{"button 1","foo"},
                                    {"button 2","bar"}},
                     new Object[]{"Button","String"});
                     
    JTable table = new JTable(dm);
    table.getColumn("Button").setCellRenderer(new ButtonRenderer());
    table.getColumn("Button").setCellEditor(new ButtonEditor(new JCheckBox()));
    JScrollPane scroll = new JScrollPane(table);
    getContentPane().add( scroll );
    setSize( 400, 100 );
    setVisible(true);
  }

  public static void main(String[] args) {
    JButtonTableExample frame = new JButtonTableExample();
    frame.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
  }
}





// File: ButtonRenderer.java
/* (swing1.1beta3) */

package jp.gr.java_conf.tame.swing.table;

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

/**
 * @version 1.0 11/09/98
 */
public class ButtonRenderer extends JButton implements TableCellRenderer {

  public ButtonRenderer() {
    setOpaque(true);
  }
  
  public Component getTableCellRendererComponent(JTable table, Object value,
                   boolean isSelected, boolean hasFocus, int row, int column) {
    if (isSelected) {
      setForeground(table.getSelectionForeground());
      setBackground(table.getSelectionBackground());
    } else{
      setForeground(table.getForeground());
      setBackground(UIManager.getColor("Button.background"));
    }
    setText( (value ==null) ? "" : value.toString() );
    return this;
  }
}





// File: ButtonEditor.java
/* (swing1.1beta3) */

package jp.gr.java_conf.tame.swing.table;

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

/**
 * @version 1.0 11/09/98
 */
public class ButtonEditor extends DefaultCellEditor {
  protected JButton button;
  private String    label;
  private boolean   isPushed;

  public ButtonEditor(JCheckBox checkBox) {
    super(checkBox);
    button = new JButton();
    button.setOpaque(true);
    button.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        fireEditingStopped();
      }
    });
  }

  public Component getTableCellEditorComponent(JTable table, Object value,
                   boolean isSelected, int row, int column) {
    if (isSelected) {
      button.setForeground(table.getSelectionForeground());
      button.setBackground(table.getSelectionBackground());
    } else{
      button.setForeground(table.getForeground());
      button.setBackground(table.getBackground());
    }
    label = (value ==null) ? "" : value.toString();
    button.setText( label );
    isPushed = true;
    return button;
  }

  public Object getCellEditorValue() {
    if (isPushed)  {
      // 
      // 
      JOptionPane.showMessageDialog(button ,label + ": Ouch!");
      // System.out.println(label + ": Ouch!");
    }
    isPushed = false;
    return new String( label ) ;
  }
  
  public boolean stopCellEditing() {
    isPushed = false;
    return super.stopCellEditing();
  }

  protected void fireEditingStopped() {
    super.fireEditingStopped();
  }
}

Posted On: 2-Jan-1999

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