JTable focused cell
I have looked all over the javadoc and done some experimentation but cannot figure out how to get the row & col of the "focused cell", the outlined cell that traverses when the tab key is pressed. The AccessibleTable class getSelectedAccessibleRows() and cols methods returns the cell when only 1 row is selected but it returns the row and col ranges when multiple row/cols are selected, not just the cell with the outline.
Looking over the source for JTable's prepareRenderer method to see how it determines what has focus yielded this possible solution:
int focusRow = myTable.getSelectionModel().getAnchorSelectionIndex();
int focusCol = myTable.getColumnModel().getSelectionModel().getAnchorSelectionIndex();Perhaps that will do what you want.
Similar Messages
-
JTable's Cell navigation with TAB
Dear ALL
I have face one problem in JTable's cell navigation with TAB. The problem as describe bellow.
I have two columns NAME and ADDRESS. Set focus on ADDRESS column's first cell. now if i am press tab key then focus controll comes on second cell which is the ADDRESS column. At the end of row controll comes on first row second column that means focus on ADDRESS column's first cell.
Please give me some hints.
Thanks in advance.
AmitYour description doesn't make any sense (to me at least) so I don't know what your problem is or what you are asking to be changed.
The normal tab order is Left to Right, Top to Bottom. So if the focus is at the top/left normal tabbing would be:
Row 0, Column 0 (name 0)
Row 0 Column 1 (address 0)
Row 1, Column0 (name 1)
Row 1, Column 1 (address 1)
Row 2, Column 0 (name 2)
Row 2, Column 1 (address 2)
Your question seems to imply that your tab from address to addreass, which doesn't make sense.
"Set focus on ADDRESS column's first cell. now if i am press tab key then focus controll comes on second cell which is the ADDRESS " -
Need help serializing an AbstractTableModel for a JTable with cell editing.
Fun times are ahead. Here we go!
I have a JTable that contains data I'd like to serialize out to a file to be restored and viewed later.
So I tried saving the AbstractTableModel subclass out to a file. Whenever I do this, I get the following error message:
java.io.NotSerializableException: javax.swing.JTable$CellEditorRemover
Now I know for fact that serializing an AbstractTableModel that was installed in a JTable without cell editing works just fine (my old code did exactly that). As a result, I think that the code that handles events in the AbstractTableModel contains references back out to the JTable, which causes the JTable to be saved no matter what (even though I'm just interested in saving the TableModel only). It causes a bigger file than normal, but file size is not an issue. The only issue I have is that CellEditorRemover (an undocumented inner class of JTable), which is automatically installed for JTables with editable cells, is not serializable.
This leads to the following questions:
1. Is there a way to avoid serialization/deserialization of the CellEditorRemover inner class of JTable?
2. Is there a way to save an AbstractTableModel without saving all of the event listeners associated with it?
I think an answer to either of these questions would go a long way towards solving my problem. Otherwise, I'll resign myself to weeping silently in the corner of my office.
Thanks!I would suggest that if you can you only save the
data... but i would do this by using the
externalizable interface.
What you will need to do is have the
writeExternal(ObjectOutputStream out) and
readExternal(ObjectOutputStream out) methods in your
class. These will be responsiable for saving the
data.
Here's an example of what you can do in these
methods... this is just a little tidbit from a program
i've written.public void writeExternal(ObjectOutput out) throws
IOException {
out.writeInt(size);
out.writeObject(drawName);
out.writeInt(playersLength);
for(int i = 0; i < playersLength; i++)
) out.writeObject(players);
out.writeInt(seedsLength);
for(int i = 0; i < seedsLength; i++)
) out.writeObject(seeds[i]);
out.writeInt(drawLength);
for(int i = 0; i < drawLength; i++)
) out.writeObject(draw[i]);
public void readExternal(ObjectInput in) throws
IOException, ClassNotFoundException {
size = in.readInt();
drawName = (String)in.readObject();
playersLength = in.readInt();
for(int i = 0; i < playersLength; i++) players[i] =
= (String)in.readObject();
seedsLength = in.readInt();
for(int i = 0; i < seedsLength; i++) seeds[i] =
= (String)in.readObject();
drawLength = in.readInt();
for(int i = 0; i < drawLength; i++) draw[i] =
= (String)in.readObject();
You can now use your class as you would a Serializable
class, but it will only save the data
Hope this helped
webaf409java
I forgot to add some critical information in my original post. My apologies. :(
I've thought about using Externalizable, but am hesitant to use it because the application would no longer be able to read in files using the old save format (ie, AbstractTableModels for JTables without CellEditorRemovers ). I want to preserve the ability to read the old saved AbstractTableModel formats if possible.
Do you know of a way to revert to the default deserialization mechanism from readExternal? This way, during deserialization, I could do a quick test on the object being read and have the ability to default to the regular deserialization mechanism if the object is of the old type or continue with the new Externalizable stuff if the object is one of the new type. Maintaining file compatibility is key. -
JTable - active cell not highlited when editable
Hello,
I'm using JDK 1.4.2_05, and I'm seeing some behavior that seems a bit strange.
In my JTables, some cells are editable, and others are not. When the user moves the active cell around (with the arrow keys, or TAB and RETURN) the non-editable cells show up with a nice blue color. If a cell is editable, it doesn't change at all, so the user has no idea where the "cursor" (meaning the active cell) is.
These cells don't have any special renderer or anything. My JTable has these set:
setRowSelectionAllowed(false);
setColumnSelectionAllowed(false);
setCellSelectionEnabled(true);Thanks for any advice!
--- EricOkay, yeah, I overrode the default renderer, and had it check whether the cell was selected or not, setting the background color appropriately. Duh. --- Eric
-
How can i treat an Jtable on cell changed event, not on value changed
Do you mean cell selection changed? One way is to add a ListSelectionListener to both the table's and the table's ColumnModel's ListSelectionModels. Something likeListSelectionListener lsl = new ListSelectionListener() {
public void valueChanged(ListSelectionEvent e) {
System.out.println(e.getSource());
ListSelectionModel lsm = (ListSelectionModel) e.getSource();
if (!lsm.getValueIsAdjusting()) {
System.out.println("Selection changed");
table.getSelectionModel().addListSelectionListener(lsl);
table.getColumnModel().getSelectionModel().addListSelectionListener(lsl);Note that simultaneous change of both row and column will generate two valueChanged events.
If that's not what you wanted to know, ask a better question.
[http://catb.org/~esr/faqs/smart-questions.html]
db -
HELP!!!Embedding a JTable on a ScrollPane into a JTable's cell
I have a single column DND JTable on a DND JScrollPane that I would like to put into another's JTable's cell. I've tried creating a CellRenderer that extends the DNDJScrollPane and returns this but this doesn't work. I do have code I could post if anyone is interested in helping out.
First copy this and compile and run and c.. then look at the code
import javax.swing.border.*;
import javax.swing.event.*;
import javax.swing.table.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.io.*;
import java.awt.*;
public class JTableExample extends JFrame
JTableRenderer renderer;
MyTableModel m1, m2;
public JTableExample()
super();
m1 = new MyTableModel();
m2 = new MyTableModel();
DefaultTableModel dtm = new DefaultTableModel()
// make first cell uneditable
public boolean isCellEditable(int row, int column)
return !(column == 0);
dtm.setDataVector(new Object[][]{{ "JTable1", m1},
{ "JTable2", m2}},
new Object[]{ "Column1","Column2"});
JTable table = new JTable(dtm);
renderer = new JTableRenderer();
table.getColumn("Column2").setCellRenderer(renderer);
table.getColumn("Column2").setCellEditor(new JTableEditor());
table.setRowHeight(80);
JScrollPane scroll = new JScrollPane(table);
getContentPane().add(scroll);
setSize( 400, 250 );
setVisible(true);
public static void main(String[] args) {
JTableExample frame = new JTableExample();
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
* JTable Editor
class JTableEditor extends DefaultCellEditor
public JTableEditor()
super(new JCheckBox());
public Component getTableCellEditorComponent(JTable table, Object value,
boolean isSelected, int row, int column)
return renderer;
public Object getCellEditorValue()
return (MyTableModel)((JTableRenderer)renderer).jtable.getModel();
* JTable Renederer
class JTableRenderer extends JScrollPane implements TableCellRenderer
JTable jtable;
public JTableRenderer()
jtable = new JTable();
getViewport().add(jtable);
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus,
int row, int column)
if (isSelected)
setForeground(table.getSelectionForeground());
setBackground(table.getSelectionBackground());
jtable.setForeground(table.getSelectionForeground());
jtable.setBackground(table.getSelectionBackground());
else
setForeground(table.getForeground());
setBackground(table.getBackground());
jtable.setForeground(table.getForeground());
jtable.setBackground(table.getBackground());
jtable.setModel((AbstractTableModel)value);
return this;
class MyTableModel extends AbstractTableModel {
final String[] columnNames = {"First Name",
"Last Name",
"Sport",
"# of Years",
"Vegetarian"};
final Object[][] data = {
{"Mary", "Campione",
"Snowboarding", new Integer(5), new Boolean(false)},
{"Alison", "Huml",
"Rowing", new Integer(3), new Boolean(true)},
{"Kathy", "Walrath",
"Chasing toddlers", new Integer(2), new Boolean(false)},
{"Mark", "Andrews",
"Speed reading", new Integer(20), new Boolean(true)},
{"Angela", "Lih",
"Teaching high school", new Integer(4), new Boolean(false)}
public final Object[] longValues = {"Angela", "Andrews",
"Teaching high school",
new Integer(20), Boolean.TRUE};
public int getColumnCount() {
return columnNames.length;
public int getRowCount() {
return data.length;
public String getColumnName(int col) {
return columnNames[col];
public Object getValueAt(int row, int col) {
return data[row][col];
public Class getColumnClass(int c) {
return getValueAt(0, c).getClass();
public boolean isCellEditable(int row, int col) {
if (col < 2) {
return false;
} else {
return true;
public void setValueAt(Object value, int row, int col) {
if (data[0][col] instanceof Integer
&& !(value instanceof Integer)) {
try {
data[row][col] = new Integer(value.toString());
fireTableCellUpdated(row, col);
} catch (NumberFormatException e) {
} else {
data[row][col] = value;
fireTableCellUpdated(row, col);
private void printDebugData() {
cheers
good luck -
Appearing the added JTable's cell JComboBox at running the Class
During the time of employing the JTable,arising the problem of how to appear the added JTable's cell JComboBox at loading the class..Can you aid me plz to resolve this bug...If u know answer,plz forward the resolution..
Sorry, I don't understand the question so I'll just point you to the Swing tutorial on "How to Use Tables" which has a working example of using a combo box in a table:
http://java.sun.com/docs/books/tutorial/uiswing/components/table.html -
I have some read-only columns in a JTable. How can I set it up so that those cells do not receive
the focus. So that when tabbing it just skips over those cells.Hopefully you have your own TableModel. Just put this in your TableModel: (It will cause all cells to be uneditable) /*=**********************************************************************************
* isCellEditable(): override this to cause the appropriate columns to be updateable *
public boolean isCellEditable(int rowIndex, int columnIndex) {
return false;
}//end isCellEditable methodAlso, if you want to cause a particular cell editor to not be updateable, add the following method to the celleditor: /*=*******************************************************************
* isCellEditable(): (override) Both this method and the TableModel's *
* isCellEditable() method must return true in order for the cell *
* to be editable. Use this method to control the number of *
* clicks required in order for editing to be allowed. *
public boolean isCellEditable(EventObject e) {
return false
}//end isCellEditable methodtajenkins -
Focus cell editor component of JTable when starting editing by typing
Hello, everybody.
We all know that the JTable component doesn't actually focus the actual cell editor component when editing is started by typing. But I need this functionality in an application of mine. So, I ask: is there a way to transfer focus to the editor component when editing is started by typing?
Thank you.
MarcosWell, I think that I've found it: JTable#setSurrendersFocusOnKeystroke.
Marcos -
JTable custom cell editor focus problem
Hi I have created a JTable (using Java 1.4.2) and have three cell Editors, one is a JFormattedTextField, one is a JComboBox and one is a custom cell editor.
When I press tab I can select the cell with the JFormattedTextField and when I start typing the JFormattedTextField accepts my input and it is displayed in the cell. This is the type of behaviour I would like but it does not seem to work for my other 2 cell editors:
When I tab to the JComboBox cell I can see that the cell is selected but typing or using the arrow keys does not allow me to select a new value in the JComboBox. (I have also tried typing space or enter to activate the JComboBox whilst the cell is selected.) The only ways to select a new value at the moment is to first click on the cell with the mouse and then use the keyboard to select a new value. It is like the actual JComboBox is not receiving the focus? Does anyone know how to solve this problem?
I also seem to have the same problem with my custom cell editor. My custom editor is a JPanel which contains JFormattedTextField again I can tab to the cell and see that it is selected but to activate the JFormattedTextField I have to actually select it with the mouse.
I have been stuck on this for some time so if any one has any suggestions they would be much appreciated !Hi I have created a JTable (using Java 1.4.2) and have three cell Editors, one is a JFormattedTextField, one is a JComboBox and one is a custom cell editor.
When I press tab I can select the cell with the JFormattedTextField and when I start typing the JFormattedTextField accepts my input and it is displayed in the cell. This is the type of behaviour I would like but it does not seem to work for my other 2 cell editors:
When I tab to the JComboBox cell I can see that the cell is selected but typing or using the arrow keys does not allow me to select a new value in the JComboBox. (I have also tried typing space or enter to activate the JComboBox whilst the cell is selected.) The only ways to select a new value at the moment is to first click on the cell with the mouse and then use the keyboard to select a new value. It is like the actual JComboBox is not receiving the focus? Does anyone know how to solve this problem?
I also seem to have the same problem with my custom cell editor. My custom editor is a JPanel which contains JFormattedTextField again I can tab to the cell and see that it is selected but to activate the JFormattedTextField I have to actually select it with the mouse.
I have been stuck on this for some time so if any one has any suggestions they would be much appreciated ! -
JTable Custom Cell Editor "focus through keyboard" question (SSCCE included
I was trying to use two components in a table cell. The first was JTextField and second the JButton. Everything works fine, except when it comes to editing the JTextfield using keyboard instead of mouse. When I use tab key to go to the custom cell, I can see that the focus is on the cell (as can be visible from background color). But when I try to edit the cell using F2 or directly entering text, nothing gets entered. If I use the mouse to go to particular cell, it works fine. Here is SSCCE. Try the following.
1. Use mouse key to select first cell for editing. Edit the cell. Everything normal.
2. Use the tab key to go to the first cell. Try to edit cell either by entering directly for after using F2. Can't get the typed text into the JTextfield.
package com.ns;
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.DefaultCellEditor;
import javax.swing.JButton;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.WindowConstants;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;
public class TextButtonCellFrame extends javax.swing.JFrame {
// Variables declaration - do not modify
private JScrollPane jScrollPane1;
private JPanel testPanel;
private JTable testTable;
// End of variables declaration
public TextButtonCellFrame() {
initComponents();
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
testPanel = new JPanel();
jScrollPane1 = new JScrollPane();
testTable = new JTable();
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
testTable.setModel(new DefaultTableModel(
new Object [][] {
{null, null, null, null},
{null, null, null, null},
{null, null, null, null},
{null, null, null, null}
new String [] {
"Title 1", "Title 2", "Title 3", "Title 4"
testTable.setRowHeight(20);
testTable.getColumnModel().getColumn(0).setCellRenderer(new MyTableCellRenderer());
testTable.getColumnModel().getColumn(0).setCellEditor(new MyTableCellEditor());
testTable.getColumnModel().getColumn(0).setPreferredWidth(200);
jScrollPane1.setViewportView(testTable);
testPanel.add(jScrollPane1);
getContentPane().add(testPanel, BorderLayout.CENTER);
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
setBounds((screenSize.width-496)/2, (screenSize.height-330)/2, 496, 330);
}// </editor-fold>
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new TextButtonCellFrame().setVisible(true);
public class MyTableCellRenderer extends JPanel implements TableCellRenderer {
Point point;
JButton button1 = new JButton("Test 1");
JTextField txtField = new JTextField();
public MyTableCellRenderer() {
setLayout(new BorderLayout());
this.add(button1, BorderLayout.EAST);
this.add(txtField,BorderLayout.CENTER);
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int rowIndex, int vColIndex) {
if (isSelected) {
txtField.setBackground(testTable.getSelectionBackground());
txtField.setBorder(UIManager.getBorder("Table.focusCellHighlightBorder"));
else {
txtField.setBackground(testTable.getBackground());
txtField.setBorder(null);
return this;
public class MyTableCellEditor extends DefaultCellEditor
implements ActionListener {
JPanel panel = new JPanel();
JButton button1 = new JButton ("Test 1");
JTextField txtField = new JTextField();
MyTableCellEditor() {
super (new JTextField());
button1.addActionListener(this);
panel.setLayout(new BorderLayout());
panel.add(button1, BorderLayout.EAST);
panel.add(txtField,BorderLayout.CENTER);
public void actionPerformed(ActionEvent e) {
if (e.getSource() == button1)
JOptionPane.showMessageDialog(null, "Action One Successful");
public Component getTableCellEditorComponent(JTable table, Object value,
boolean isSelected, int row, int column) {
txtField.requestFocusInWindow();
return panel;
}regards,
nirvan.I don't know what's better:
import java.awt.*;
import java.awt.event.*;
import java.util.EventObject;
import javax.swing.*;
import javax.swing.table.*;
public class TextButtonCellFrame extends JFrame {
JTable testTable = new JTable();
public TextButtonCellFrame() {
testTable.setModel(new DefaultTableModel(
new Object [][] {
{null, null, null, null},
{null, null, null, null}
new String [] { "1", "2", "3", "4" }
testTable.setRowHeight(20);
testTable.getColumnModel().getColumn(0).setCellRenderer(
new MyTableCellRenderer());
testTable.getColumnModel().getColumn(0).setCellEditor(
new MyTableCellEditor(new JTextField()));
testTable.getColumnModel().getColumn(0).setPreferredWidth(200);
getContentPane().add(new JScrollPane(testTable));
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
setSize(480,320);
setLocationRelativeTo(null);
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new TextButtonCellFrame().setVisible(true);
public class MyTableCellRenderer extends JPanel
implements TableCellRenderer {
JButton button1 = new JButton("Test 1");
JTextField txtField = new JTextField();
public MyTableCellRenderer() {
setLayout(new BorderLayout());
this.add(button1, BorderLayout.EAST);
this.add(txtField,BorderLayout.CENTER);
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int rowIndex, int vColIndex) {
if (isSelected) {
txtField.setBackground(testTable.getSelectionBackground());
txtField.setBorder(UIManager.getBorder("Table.focusCellHighlightBorder"));
} else {
txtField.setBackground(testTable.getBackground());
txtField.setBorder(null);
txtField.setText(value==null?"":value.toString());
return this;
public class MyTableCellEditor extends DefaultCellEditor
implements ActionListener {
JPanel panel = new JPanel(new BorderLayout());
JButton button1 = new JButton ("Test 1");
JTextField txtField; // = new JTextField();
MyTableCellEditor(JTextField txtField) {
super (txtField);
this.txtField = txtField;
button1.addActionListener(this);
panel.add(button1, BorderLayout.EAST);
panel.add(txtField,BorderLayout.CENTER);
public void actionPerformed(ActionEvent e) {
if (e.getSource() == button1)
JOptionPane.showMessageDialog(null, "Action One Successful");
public Component getTableCellEditorComponent(JTable table, Object value,
boolean isSelected, int row, int column) {
txtField.setText(value==null?"":value.toString());
SwingUtilities.invokeLater(new Runnable() {
public void run() {
txtField.requestFocusInWindow();
return panel;
} -
JTable custom cell editor losing focus
This is a followup to Re: Tutorial on AWT/Swing control flow wherein I ask for pointers to help me understand the source of focus-loss behaviour in my JTable's custom cell editor.
I have done some more investigations and it turns out that the focus loss is a more general problem with custom cell editors which call other windows. Even the color-picker demo in the JTable tutorial at http://download.oracle.com/javase/tutorial/uiswing/examples/components/index.html#TableDialogEditDemo has this problem, IF you add a text field or two to the layout BEFORE the table. The only reason the table in the demo doesn't lose the focus when the color-picker comes out is because the table is the only thing in the window!
Here is the demo code, augmented with two text fields, which are admittedly ugly here but which serve the desired purpose:
* Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - Neither the name of Oracle or the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import javax.swing.*;
import javax.swing.border.Border;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class TableDialogEditDemo extends JPanel {
public class ColorEditor extends AbstractCellEditor
implements TableCellEditor,
ActionListener {
Color currentColor;
JButton button;
JColorChooser colorChooser;
JDialog dialog;
protected static final String EDIT = "edit";
public ColorEditor() {
//Set up the editor (from the table's point of view), which is a button.
//This button brings up the color chooser dialog, which is the editor from the user's point of view.
button = new JButton();
button.setActionCommand(EDIT);
button.addActionListener(this);
button.setBorderPainted(false);
//Set up the dialog that the button brings up.
colorChooser = new JColorChooser();
dialog = JColorChooser.createDialog(button, "Pick a Color", true, //modal
colorChooser, this, //OK button handler
null); //no CANCEL button handler
* Handles events from the editor button and from the dialog's OK button.
public void actionPerformed(ActionEvent e) {
if (EDIT.equals(e.getActionCommand())) {
//The user has clicked the cell, so bring up the dialog.
button.setBackground(currentColor);
colorChooser.setColor(currentColor);
dialog.setVisible(true);
//Make the renderer reappear.
fireEditingStopped();
} else { //User pressed dialog's "OK" button
currentColor = colorChooser.getColor();
public Object getCellEditorValue() {
return currentColor;
public Component getTableCellEditorComponent(JTable table,
Object value,
boolean isSelected,
int row,
int column) {
currentColor = (Color) value;
return button;
public class ColorRenderer extends JLabel
implements TableCellRenderer {
Border unselectedBorder = null;
Border selectedBorder = null;
boolean isBordered = true;
public ColorRenderer(boolean isBordered) {
this.isBordered = isBordered;
setOpaque(true);
public Component getTableCellRendererComponent(
JTable table, Object color,
boolean isSelected, boolean hasFocus,
int row, int column) {
Color newColor = (Color) color;
setBackground(newColor);
if (isBordered) {
if (isSelected) {
if (selectedBorder == null) {
selectedBorder = BorderFactory.createMatteBorder(2, 5, 2, 5,
table.getSelectionBackground());
setBorder(selectedBorder);
} else {
if (unselectedBorder == null) {
unselectedBorder = BorderFactory.createMatteBorder(2, 5, 2, 5,
table.getBackground());
setBorder(unselectedBorder);
return this;
public TableDialogEditDemo() {
super(new GridLayout());
JTextField tf1 = new JTextField("tf1");
add(tf1);
JTextField tf2 = new JTextField("tf2");
add(tf2);
JTable table = new JTable(new MyTableModel());
table.setPreferredScrollableViewportSize(new Dimension(500, 70));
table.setFillsViewportHeight(true);
JScrollPane scrollPane = new JScrollPane(table);
table.setDefaultRenderer(Color.class,
new ColorRenderer(true));
table.setDefaultEditor(Color.class,
new ColorEditor());
add(scrollPane);
class MyTableModel extends AbstractTableModel {
private String[] columnNames = {"First Name",
"Favorite Color",
"Sport",
"# of Years",
"Vegetarian"};
private Object[][] data = {
{"Mary", new Color(153, 0, 153),
"Snowboarding", new Integer(5), new Boolean(false)},
{"Alison", new Color(51, 51, 153),
"Rowing", new Integer(3), new Boolean(true)},
{"Kathy", new Color(51, 102, 51),
"Knitting", new Integer(2), new Boolean(false)},
{"Sharon", Color.red,
"Speed reading", new Integer(20), new Boolean(true)},
{"Philip", Color.pink,
"Pool", new Integer(10), new Boolean(false)}
public int getColumnCount() {
return columnNames.length;
public int getRowCount() {
return data.length;
public String getColumnName(int col) {
return columnNames[col];
public Object getValueAt(int row, int col) {
return data[row][col];
public Class getColumnClass(int c) {
return getValueAt(0, c).getClass();
public boolean isCellEditable(int row, int col) {
if (col < 1) {
return false;
} else {
return true;
public void setValueAt(Object value, int row, int col) {
data[row][col] = value;
fireTableCellUpdated(row, col);
private static void createAndShowGUI() {
JFrame frame = new JFrame("TableDialogEditDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JComponent newContentPane = new TableDialogEditDemo();
newContentPane.setOpaque(true);
frame.setContentPane(newContentPane);
frame.pack();
frame.setVisible(true);
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}When you come back from choosing a color, tf1 is given the focus, instead of the table. This is because bringing the color picker window to the front causes a focus lost event for the cell editor component; it's temporary, as it should be, so why on earth is the system losing track of who has focus in the window??
I see the following in Window#getMostRecentFocusOwner():
public Component getMostRecentFocusOwner()
if (isFocused())
return getFocusOwner();
else
Component mostRecent =
KeyboardFocusManager.getMostRecentFocusOwner(this);
if (mostRecent != null)
return mostRecent;
else
return (isFocusableWindow())
? getFocusTraversalPolicy().getInitialComponent(this)
: null;
}My app has a custom focus traversal policy, so I'm able to see who is being called, and indeed, getInitialComponent() is being called. Clearly, the KeyboardFocusManager is actually losing track of the fact that the table was focussed at the point where control was transferred to the color picker! This strikes me as completely unreasonable, especially since, as noted, this is a temporary focus loss event, not a permanent one.
I'd be grateful for any wisdom in solving this, since similar behaviour to this little demo -- without focus loss, naturally -- is an essential part of my application.Looks like it is because the 'restore-focus-to-previous-after-modal-dialog-close' is in a later event than when the control returns to the action performed (which I guess makes sense: it continues the action event handler and the focus events are handled later, but I needed two chained invoke laters so it might also be that the OS events comes later).
The following works for me (in the actionPerformed edited):
// create the dialog here so it is correctly parented
// (otherwise sometimes OK button not correctly the default button)
dialog = JColorChooser.createDialog(button, "Pick a Color", true, //modal
colorChooser, this, //OK button handler
null); //no CANCEL button handler
//The user has clicked the cell, so bring up the dialog.
button.setBackground(currentColor);
colorChooser.setColor(currentColor);
button.addFocusListener(new FocusListener() {
@Override
public void focusLost(FocusEvent e) {}
@Override
public void focusGained(FocusEvent e) {
// dialog closed and focus restored
button.removeFocusListener(this);
fireEditingStopped();
dialog.setVisible(true);but a simpler request might be better (althoug I still need an invoke later):
// rest as before except the FocusListener
dialog.setVisible(true);
button.requestFocusInWindow();
EventQueue.invokeLater(new Runnable() {
public void run() {
fireEditingStopped();
});And a quick fix to the renderer so you can actualy see the focus on it:
if(hasFocus) {
Border border = DefaultLookup.getBorder(this, ui, "Table.focusCellHighlightBorder");
setBorder(BorderFactory.createCompoundBorder(
border, BorderFactory.createMatteBorder(1, 4, 1, 4,
((MatteBorder) getBorder()).getMatteColor())));
} -
JTable Custom Cell Editor: how to get value?
I have some custom cell renderers and editor. One of my custom cell editor is a text field that can popup a separat gui for easier data selection. As this text field alone with the popup gui works great, when i use this field in my custom jtable cell editor, the gui selected value is never displayed in the table cell. it just shows the old value.?
Well, here's how I do it. I'm very new to Swing so I'm, not sure if this is the best way. If you find a better way, please repost on this message.
My cell editor is a JPanel with a JTextfield in it. I make sure that the JTextfield will have default focus when the JPanel is focused.
In the CellEditor, I add a KeyListener to the JTextField so that when the user hits enter, it fires the stopEditing. I then add a function to CellEditor that returns what's in the JTextField.
In the code, m_value is the JTextField. You want to add MyKeyAdapter to the JTextField. Viola, it works!
* This private class reads in an enter key.
class MyKeyAdapter extends KeyAdapter {
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_ENTER) {
stopCellEditing();
* Returns the value of the editor
* @return the value of the editor
public String getValue() {
return m_value.getText(); -
JTable - Custom cell editor lossing commit
Hello,
I have a custom cell editor and a default renderer assigned to a specific cell in my table...
I have the following problem :
If i change the value of cell 'c1' from value 'v1' to 'v2' and press enter and go to another cell the value in 'c1' is rendered correctly as 'v2'
Hoever if i change the value of cell 'c1' from 'v1' to 'v2' and simply click over to another cell the value in 'c1' stays rendered as 'v1'
Question : Is there ANY way to mimic the behavior of the user pressing enter in my custom cell editor when a user simply selects another cell, i guess on loss of focus or something..
This is the last problem i have on the current project i am on and its very annoying.
Thanks in advance, any help appreciated..
-AlanI have the same problem using a custom Date/Time Picker Object (which extends JComboBox) as an editor within a table cell. For simplicity sake, I am posting code using only the base editable JComboBox, but it exhibits the same symptoms. If you enter a value in the TextField portion of the ComboBox and Tab, your value remains the same. If you enter a value in the TextField portion of the ComboBox and click in another cell, the value returns to the previous value (before editing began).
import java.awt.*; // BorderLayout
import javax.swing.*; // JTable, JFrame
import javax.swing.table.*; // DefaultTableModel
public class Tester extends JFrame
public static void main(String[] args)
Tester test = new Tester();
public Tester()
String[] values = {"Test", "Values"};
JComboBox combo = new JComboBox(values);
combo.setEditable(true);
DefaultCellEditor editor = new DefaultCellEditor(combo);
JTable table = new JTable(2, 3);
table.getColumn(table.getColumnName(0)).setCellEditor(editor);
JScrollPane scroll = new JScrollPane(table);
getContentPane().add(scroll, BorderLayout.CENTER);
pack();
setVisible(true);
} -
FocusLost event for JTable during cell editing
When a cell in a JTable is getting edited, how can I get notified of the focusLost event? I added the focus listener using JTable.addFocusListener, but the focusLost of the listener is not called when a cell inside the table is getting edited (it works fine otherwise). I am aware of the client property terminateEditOnFocusLost to solve this problem in 1.4 but I can't use it since I am still on 1.3.1_04.
Suggestions welcome.http://forum.java.sun.com/thread.jsp?forum=57&thread=431440
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