Edit Field with button (...)

Question

I'm beginner in Java. I'd like a cell in a table with a button (...) on the right side to open a Dialogbox (FileDialog to put a filename in the cell). Thank you in advance for any help.
Regards
Museti

Answer 1

Hi
I have tried the codes below but can't get it right. Could you tell me what is going wrong here? Thanks.
//MyTableCellRenderer
package testrenderer;
import javax.swing.UIManager;
import java.awt.*;
public class MyTableCellRenderer {
boolean packFrame = false;
/**Die Anwendung konstruieren*/
public MyTableCellRenderer() {
FrameCellRenderer frame = new FrameCellRenderer();
//Frames �berpr�fen, die voreingestellte Gr��e haben
//Frames packen, die nutzbare bevorzugte Gr��eninformationen enthalten, z.B. aus ihrem Layout
if (packFrame) {
frame.pack();
else {
frame.validate();
//Das Fenster zentrieren
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
Dimension frameSize = frame.getSize();
if (frameSize.height > screenSize.height) {
frameSize.height = screenSize.height;
if (frameSize.width > screenSize.width) {
frameSize.width = screenSize.width;
frame.setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2);
frame.setVisible(true);
/**Main-Methode*/
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
catch(Exception e) {
e.printStackTrace();
new MyTableCellRenderer();
// FrameCellRenderer.java
package testrenderer;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class FrameCellRenderer extends JFrame
implements MyTableData
JPanel contentPane;
JMenuBar jMenuBar1 = new JMenuBar();
JMenu jMenuFile = new JMenu();
JMenuItem jMenuFileExit = new JMenuItem();
JMenu jMenuHelp = new JMenu();
JMenuItem jMenuHelpAbout = new JMenuItem();
BorderLayout borderLayout1 = new BorderLayout();
JPanel jPanel1 = new JPanel();
BorderLayout borderLayout2 = new BorderLayout();
JScrollPane jScrollPane1 = new JScrollPane();
JTable jTable1 = new JTable(DATA, COLHEADS);
BrowseButtonEditor be = new BrowseButtonEditor();
/**Den Frame konstruieren*/
public FrameCellRenderer() {
enableEvents(AWTEvent.WINDOW_EVENT_MASK);
try {
jbInit();
catch(Exception e) {
e.printStackTrace();
/**Initialisierung der Komponenten*/
private void jbInit() throws Exception {
//setIconImage(Toolkit.getDefaultToolkit().createImage(FrameCellRenderer.class.getResource("[Ihr Symbol]")));
contentPane = (JPanel) this.getContentPane();
contentPane.setLayout(borderLayout1);
this.setSize(new Dimension(400, 300));
this.setTitle("Table Cell Renderer");
jMenuFile.setText("Datei");
jMenuFileExit.setText("Beenden");
jMenuFileExit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
jMenuFileExit_actionPerformed(e);
jMenuHelp.setText("Hilfe");
jMenuHelpAbout.setText("Info");
jMenuHelpAbout.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
jMenuHelpAbout_actionPerformed(e);
jPanel1.setLayout(borderLayout2);
jMenuFile.add(jMenuFileExit);
jMenuHelp.add(jMenuHelpAbout);
jMenuBar1.add(jMenuFile);
jMenuBar1.add(jMenuHelp);
contentPane.add(jPanel1, BorderLayout.CENTER);
jPanel1.add(jScrollPane1, BorderLayout.CENTER);
jScrollPane1.getViewport().add(jTable1, null);
this.setJMenuBar(jMenuBar1);
jTable1.getColumn("URL").setCellRenderer(new BrowseButtonRenderer());
jTable1.getColumn("URL").setCellEditor(new BrowseButtonEditor());
/**Aktion Datei | Beenden durchgef�hrt*/
public void jMenuFileExit_actionPerformed(ActionEvent e) {
System.exit(0);
/**Aktion Hilfe | Info durchgef�hrt*/
public void jMenuHelpAbout_actionPerformed(ActionEvent e) {
/**�berschrieben, so dass eine Beendigung beim Schlie�en des Fensters m�glich ist.*/
protected void processWindowEvent(WindowEvent e) {
super.processWindowEvent(e);
if (e.getID() == WindowEvent.WINDOW_CLOSING) {
jMenuFileExit_actionPerformed(null);
// MyTableData.java
public interface MyTableData {
public static final String[][] DATA = {
{"Vertrag 01","c:\\vertrag\\deutsch\\vertrag01.htm"},
{"Vertrag 02","c:\\vertrag\\deutsch\\vertrag02.htm"},
{"Vertrag 03","c:\\vertrag\\franz�sisch\\vertrag03.htm"},
{"Vertrag 04","c:\\vertrag\\franz�sisch\\vertrag04.htm"}
public static final String[] COLHEADS = {
"Bezeichnung", "URL"
// BrowseButtonEditor.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
public class BrowseButtonEditor
extends AbstractCustomCellEditor
     private BrowseButtonRenderer br;
     public BrowseButtonEditor()
          br = new BrowseButtonRenderer("...");
          this.addMouseListenerToLabel();
     public BrowseButtonEditor(String title)
          br = new BrowseButtonRenderer(title);
          this.addMouseListenerToLabel();
     public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected,
                                                  int row, int column)
          JButton button = br.getButton();
button.setText("...");
          String sStr = new String(((String)value));
setCellEditorValue(sStr);
JLabel label = br.getLabel();
label.setText(sStr);
          return br;
     public boolean stopCellEditing()
          JButton button = br.getButton();
JLabel label = br.getLabel();
          setCellEditorValue(new String(label.getText()));
          return super.stopCellEditing();
     private void addMouseListenerToLabel()
          br.getLabel().addMouseListener(new MouseAdapter()
                    public void mousePressed(MouseEvent e)
                         if (e.getClickCount() == 2)
                              cancelCellEditing();
// BrowseButtonRenderer.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.TableCellRenderer;
public class BrowseButtonRenderer
extends JPanel implements
TableCellRenderer
     private BorderLayout borderLayout1 = new BorderLayout();
     private JLabel label = new JLabel();
     private JButton button = new JButton();
     public BrowseButtonRenderer()
          this.setSize(40, 40);
          this.setLayout(borderLayout1);
          button.setPreferredSize(new Dimension(40, 30));
          this.add(label, BorderLayout.NORTH);
          this.add(button, BorderLayout.EAST);
          label.setHorizontalAlignment(JLabel.LEFT);
          label.setHorizontalTextPosition(JLabel.LEFT);
          // add change listener to button
          button.addChangeListener(new ChangeListener()
                    public void stateChanged(ChangeEvent e)
                         label.setText("" + button.getValue());
button.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
button_actionPerformed(e);
     public BrowseButtonRenderer(String title)
          this();
button.setText(title);
     public Component getTableCellRendererComponent(JTable table, Object value,
                                                  boolean isSelected, boolean hasFocus, int row, int column)
          String v = (String)value;
          String sStr = (String)value;
          label.setText(sStr);
          button.setEnabled(isSelected);
          label.setEnabled(isSelected);
          label.setBackground(isSelected && hasFocus ? table.getSelectionBackground() : table.getBackground());
          button.setBackground(isSelected ? table.getSelectionBackground() : table.getBackground());
label.setBackground(Color.white);
          this.setBackground(isSelected ? table.getSelectionBackground() : table.getBackground());
          this.setForeground(isSelected && hasFocus ?     table.getSelectionBackground() : table.getBackground());
          this.setFont(table.getFont());
          return this;
     public JButton getButton()
          return button;
     public JLabel getLabel()
          return label;
void button_actionPerformed(ActionEvent e)
JFileChooser datei = new JFileChooser();
String sFile = new String("");
int returnVal = datei.showOpenDialog(this);
if (returnVal == JFileChooser.APPROVE_OPTION)
sFile = datei.getSelectedFile().getName();
System.out.println("You chose to open this file: " + sFile);
label.setText(sFile);
// AbstractCustomCellEditor.java
import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
import javax.swing.tree.*;
import java.awt.event.MouseEvent;
import java.util.EventObject;
* <P>
* This abstract class can be extended in order to customize the look and
* feel of the editor for a table cell. This will allow the use of any type
* of component (i.e. JComboBox, JSlider, JCheckBox, or other custom renderers)
* </P>
* <P>
* This class uses and EventListenerList to maintain a list of CellEditorListeners
* and provides two protected methods for firing editing-stopped and editing-canceled
* events to listeners.
* </P>
* <P>
* This class also maintains an Object reference that represents the editor's value.
* In addition to implementing the TableCellEditor.getCellEditorValue() method, this
* class also provides a setter method for this value - setCellEditorvalue(Object value)
* </P>
* <P>
* This class, like DefaultCellEditor, provides a clickCountToStart property that
* specifies the number of mouse clicks required to initiate editing.
* </P>
* <P>
* This class defines a cell to be editable if the event passed to
* isCellEditable() is a mouse event and the click count is equal to (or greater than)
* the clickCountToStart.
* </P>
* <P>
* This class also defined all cells to be selectable.
* </P>
* <P>
* The stopCellEditing and cancelCellEditing methods fire appropriate events, and
* stopCellEditing returns true, indicating that editing was stopped.
* </P>
* <P>
* Important Note: This class leaves the getTableCellEditorComponent method defined
* by TableCellEditor unimplemented. Extensions of this class MUST implement
* getTableCellEditorComponent().
* </P>
* <P>
* Note: This code was extracted and modified from:
* Graphic Java 2 - Mastering the JFC vol. II: Swing (3rd. ed)
* by: David M. Geary
* ISBN: 0-13-079667-0
* Chapter 19: Tables
* AbstractCellEditor
* </P>
* <P>
* @author A. Timpone
abstract class AbstractCustomCellEditor implements TableCellEditor
     protected EventListenerList listenerList = new EventListenerList();
     protected Object value;
     protected ChangeEvent changeEvent = null;
     protected int clickCountToStart = 1;
     * This method returns tha value (as an Object) stored within
     * the editor
     * @return The Object representation of the editor's value
     public Object getCellEditorValue()
          return value;
     * This method is used to set the value of the editor
     * @param value The value you wish to set the editor component to
     public void setCellEditorValue(Object value)
          this.value = value;
     * This method is used to control the number of mouse clicks required to invoke
     * the editor
     * @count Defaulted to 1, this is the number of clicks you wish performed to invoke the editor
     public void setClickCountToStart(int count)
          clickCountToStart = count;
     * The method returns the number of clicks required to invoke the editor
     * @return The number of mouse clicks required to invoke the editor
     public int getClickCountToStart()
          return clickCountToStart;
     * This method determines if a cell extending this class is editable based on
     * the type of event performed on the cell. If this event is of type MouseEvent,
     * it will invoke the editor if the correct number of clicks is performed
     * @param anEvent The type of event being performed on the cell
     * @return true of false indicating the cell is editable
     public boolean isCellEditable(EventObject anEvent)
          if (anEvent instanceof MouseEvent)
               if (((MouseEvent)anEvent).getClickCount() < clickCountToStart)
                    return false;
          return true;
     * This method determines if the cell should be selected.
     * By default, this method returns true
     * @param anEvent The type of event being performed on the cell
     * @return true of false indicating the cell is selected (Default to true)
     public boolean shouldSelectCell(EventObject anEvent)
          return true;
     * This method executed the TableCellEditor.fireEditingStopped() method
     * indicating that editing on the current cell has stopped
     * @return true or false indicating cell editing has stopped (Default to true)
     public boolean stopCellEditing()
          fireEditingStopped();
          return true;
     * This method executed the TableCellEditor.fireEditingCanceled() method
     * indicating that editing on the current cell has been canceled
     public void cancelCellEditing()
          fireEditingCanceled();
     * This method adds a CellEditorListener to the cell entending this class.
     * This listener is added into the listener list
     * @param l This is the CellEditorListener you wish to add to the specific cell
     public void addCellEditorListener(CellEditorListener l)
          listenerList.add(CellEditorListener.class, l);
     * This method removes a CellEditorListener from the cell entending this class.
     * This listener is removed from the listener list
     * @param l This is the CellEditorListener you wish to remove from the specific cell
     public void removeCellEditorListener(CellEditorListener l)
          listenerList.remove(CellEditorListener.class, l);
     * This method loops through all of the listeners within the listenerList
     * and calls the appropriate editingStopped() method passing in the
     * ChangeEvent
     protected void fireEditingStopped()
          Object[] listeners = listenerList.getListenerList();
          for (int i = listeners.length-2; i>=0; i-=2)
               if (listeners[i] == CellEditorListener.class)
                    if (changeEvent == null)
                         changeEvent = new ChangeEvent(this);
                    ((CellEditorListener)listeners[i+1]).editingStopped(changeEvent);
     * This method loops through all of the listeners within the listenerList
     * and calls the appropriate editingCanceled() method passing in the
     * ChangeEvent
     protected void fireEditingCanceled()
          Object[] listeners = listenerList.getListenerList();
          for (int i = listeners.length - 2; i >= 0; i -= 2)
               if (listeners==CellEditorListener.class)
                    if (changeEvent == null)
                         changeEvent = new ChangeEvent(this);
                    ((CellEditorListener)listeners[i+1]).editingCanceled(changeEvent);