JTable Cell Focus Change
Hi all,
Is it possible to keep track the cell focus change in JTable so that I can perform appropriate validation. For example, user use the key to move from cell (2,3) to (2,4) or use the mouse to move from (2,4) to (5,3).
I know that it is possible to use ListSelectionEvent on SelectionModel (for row change) and & ColumnModel (for change change) to do that. However, when both row & column change simultaneously, I need to do only 1 validation (in fact, the validation must have both information). My existing code gives me two separate event instead.
Any idea ? Thanks in advance.
This will be a decently hard nut to crack without making a slightly (or worse) cluttered solution.
I've been part of a framework where applications-developer has requested solutions like you currently ask for. The solution we implemented was twofold.
1) We made an centralised TableModel that people could use as-is or extend if nessecary. To this tablemodel we added a new set of events that could be consumed, or in some cases even replaced.
The events was for instance 'beforeCellChange' and contained enough data on the current value, the new value, location in model and space for replacing any of the above values. Many more events was added as time went by as well.
We made the event-listener fairly generalized and the type sent in the actual event, this allowed us to expand the events without having to change any interfaces. The drawback with this was that it forces the developer to check which type of event is happening, a bit like events happened in AWT 1.0.
With the help of this, the developers just added the nessecary listeners to the table model and they could consume, change, validate any input to a table before it was committed.
2) No good method for row-verification could really be found.
There was a few futile tries, but since data could be entered in any order, the validation raised the amount of code with a order of magnitude. It does work, by listening on selection events, but quite a few extra checks has to be resolved, as instance with rows not validated etc etc.
My recomendations, verify data carefully from events either from model or the table-editor. The result will most assurdly end in that you need to have an tablemodel on your own and also TableCellRenderer to accomplish all that you want to do.
Yours sincerely
Peter Norell
Similar Messages
-
How to listen a JTable cell is changed?
is it have any Listener can know the JTable cell cursor change to other?
Thanks!JTable exposes a ListSelectionModel through getSelectionModel() that you can listen to for changes in the selected row. I think you need to get the TableColumnModel to detect changes in the selected column:
table.getSelectionModel().addSelectionListener(selectionListener);
table.getColumnModel().getSelectionModel().addSelectionListener(selectionListener);selectionListener should get notified if a change is made to the selected row or column.
Hope this helps. -
I am using the setValueAt method in the TableModel of a JTable in order to do validation of the value the user has entered into a cell of a table (the validation involves looking at the values of other components on the same JFrame).
Everything works fine, except for the following case: The person enters a value into the cell of the editor. The person then moves the focus to another component via a mouse-click. The cell in the table still shows the new value entered by the person, but the setValueAt method is never triggered, and <table>.getValueAt(<row>,<col>) shows the value of the cell prior to the change.
Is there a way to ensure the setValueAt method of the TableModel is triggered before the JTable loses focus? Or is there a better (i.e. correct) way to accomplish this (ensuring a cell change is 'committed' to the table before
losing focus)?Bug? What Bug? Sun considers this a feature....LOL
Here is my work-around:
public boolean editCellAt(final int row, final int col, EventObject e) {
if (e instanceof MouseEvent) {
if (((MouseEvent)e).getClickCount()<2) { // single click on a cell other than the one being edited causes editing to stop
if (isEditing())getCellEditor(getEditingRow(),getEditingColumn()).stopCellEditing();
return false;
return super.editCellAt(row,col,e); // cell editing on a keyevent or a double mouse click
}This is will if the mouse is clicked elsewhere on the same table. I have a lot of other tricks for JTable and things....check out my web site at:
http://www.aokabc.com
;o)
V.V. -
JTable cell focus outline with row highlight
With a JTable, when I click on a row, the row is highlighted and the cell clicked has a subtle outline showing which cell was clicked.
I would like to do that programatically. I can highlight the row, but I have not been able to get the subtle outline on the cell. My purpose is to point the user to the row and cell where a search found a match. I do not have cell selection enabled, because I want the whole row highlighted.
My basic code is:
table.changeSelection(irow, icol, false, false);
table.scrollRectToVisible(table.getCellRect(irow, icol, true));I keep thinking I just need to find a way to "set focus" to the cell so the subtle outline is displayed, but I cannot find something like that.
Does anyone have some ideas on how to activate that automatic outline on the cell? I prefer not to write custom cell renderers for this if possible.That seems unnecessarily complicated, the outline is the focused cell highlight border so requesting focus on the table should be enough.
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import javax.swing.*;
public class TestTableFocus {
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
final JTable table = new JTable(10, 10);
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(new JScrollPane(table));
frame.getContentPane().add(new JButton(
new AbstractAction("Focus cell") {
@Override
public void actionPerformed(ActionEvent e) {
table.changeSelection(5, 5, false, false);
centerCell(table, 5, 5);
table.requestFocusInWindow();
private void centerCell(JTable table, int x, int y) {
Rectangle visible = table.getVisibleRect();
Rectangle cell = table.getCellRect(x, y, true);
cell.grow((visible.width - cell.width) / 2,
(visible.height - cell.height) / 2);
table.scrollRectToVisible(cell);
}), BorderLayout.PAGE_END);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
} -
Does anyone know why cells in a JTable would still respond to focus events even though they are disabled?
For example, assume this is my table:
D D E E E E E
D D E E E E E
D D E E E E E
D = Disabled
E = Enabled
When this table gets focus, the upper left cell "D" gets focus. What if I wanted the first "E" in row one to be the default cell? And what if I don't want any "D" cells to be focusable?FocusListener only tells me where iv'e been or where I am going...it does not give me a mechanism to set focus to a particular cell. After searching the API and the Forums, it looks as if I am not the first to ask this question and certainly not the first to find that it cannot be done with the JTable. So, either I give up on the idea or find a JTable replacement...
-
PLEASE HELP-JTable cell editor-change one cell, changes all cells of column
for example i have 3 rows 4 columns, column 3 and 4 are dates. now if i change the date to a new value (eg for of column 3)
for any row, and then i click on any other cell. All cell values ie all rows for that column are changed to that new value.
ie it changed column 3 for all rows 1, 2 and 3 to that new value which i changed in only one cell of that column.
PLEASE HELP me , tell me what change i make to the code to fix it ....
this is my cell renderer for date
class DateCellRenderer extends JbcDateTimeChooser implements TableCellRenderer {
protected Border m_noFocusBorder;
public DateCellRenderer() {
super();
setStylePattern(JbcDateTimeChooser.MEDIUM);
m_noFocusBorder = new EmptyBorder(1, 2, 1, 2);
setOpaque(true);
setBorder(m_noFocusBorder);
public Component getTableCellRendererComponent(JTable table,
Object value, boolean isSelected, boolean hasFocus,
int row, int column)
if(value instanceof Date) {
Date b = (Date)value;
setDate(b);
setFont(table.getFont());
setBorder(hasFocus ? UIManager.getBorder(
"Table.focusCellHighlightBorder") : m_noFocusBorder);
return this;
}I have this custom cell editor date
class DateCellEditor extends AbstractCellEditor implements TableCellEditor {
protected JbcDateTimeChooser editor;
public DateCellEditor() {
super();
editor = new JbcDateTimeChooser();
editor.setStylePattern(JbcDateTimeChooser.MEDIUM);
public Object getCellEditorValue() {
return editor.getDate();
public Component getTableCellEditorComponent(JTable table,
Object value, boolean isSelected, int row, int column)
if(value instanceof Date) {
editor.setDate((Date)value);
return editor;
}and this is how i defined in jtable
lnnTableModel = new CellSiteLNNTableModel();
lnnTable.setModel(lnnTableModel);
lnnTableModel.addColumn("ABC");
lnnTableModel.addColumn("DEF");
lnnTableModel.addColumn("Date From");
lnnTableModel.addColumn("Date To");
for(int k = 0; k < lnnTableModel.getColumnCount(); k++) {
TableColumn col = lnnTable.getColumn(lnnTableModel.getColumnName(k));
TableCellRenderer renderer;
DefaultTableCellRenderer textRenderer = new DefaultTableCellRenderer();
renderer = textRenderer;
TableCellEditor editor;
JTextField textColumn = new JTextField();
if((k == CellSiteLNN.DATE_FROM) || (k == CellSiteLNN.DATE_TO)) {
editor = new DateCellEditor(); // this is the cell editor
renderer = new DateCellRenderer(); // this is the assigned cell renderer
} else {
editor = new DefaultCellEditor(textColumn);
col.setCellRenderer(renderer);
col.setCellEditor(editor);
}table model is extended from AbstractTableModel
and have these methods
do you see anything wrong here.....
public Object getValueAt(int row, int column) {
Vector rowVector = (Vector)dataVector.elementAt(row);
return rowVector.elementAt(column);
public void setValueAt(Object aValue, int row, int column) {
Vector rowVector = (Vector)dataVector.elementAt(row);
rowVector.setElementAt(aValue, column);
// generate notification
fireTableChanged(new TableModelEvent(this, row, row, column));
} // end method (setValueAt) -
Way to listen for change in JTable cell?
I am having troubles trying to catch a key event while the user is entering text inside a given JTable cell (x/y location). The JTable only seems to manage String objects in it's cells so I can't place a JTextField in there with a KeyListener on it.
Currently, I can only get control of the application once the user has left the cell they are editing.
Does anyone have an example of a JTable 'cell KeyListener' scenario? At this point I want to see if I can print 'hello world' each time I type a character within a cell. Then I'll go from there....If you want to know when the contents of a cell have been updated you should use a TableModelListener.
If you want to know when a character is added/removed from the cell editor then you need to first understand how this works with a simple text field.
Typically you would use a DocumentListener to receive notifies of a change to the text field. However, within the DocumentEvent you wouldn't be able to change the text field as this notification comes after the text field has already been updated.
If you need to ability to intercept changes to the text field before they happen, then you would need to use a DocumentFilter. An example of using a DocumentFilter is given in the Swing tutorial on [url http://java.sun.com/docs/books/tutorial/uiswing/components/generaltext.html#filter]Text Component Features.
Once you get your regular text field working the way you want, the next step to create a DefaultCellEditor using this JTextField and use this editor in your JTable. The above tutorial also has a section on using editors in a table. -
How can I get or listen to event when my cell lost focus ??
The correct answer is to... well, that should be saved for the Swing forum. or alternatively, its in the text for THE FIRST google result for "jtable cell listener".
-
I have a JTable which contains all the services charges and It should automatically calculate the Total of all the service Charges and so my client wants that on JTable Cell Change the total field should be updated
So Can any body give me the event listener for that
Thanks in advance
CSJakhariaThanks for that
That Works But do u know anything which prevents the continous loop
I mean I have to change certain fields in the JTable itself in the listner itself and if i do that it ends up in Stack Overflow Exception Which implies never ending loop
I can stop that with the use of variable But is there any easy way out I mean any method by which i can stop this endless LOOP -
Code to change JTable cell color not working
My code below is supposed to change the color
of a single JTable cell however its not working.
Could anyone please tell me why?
Here's the code:
import java.awt.*;
import javax.swing.table.*;
import javax.swing.*;
import java.awt.event.*;
public class ColorTable extends JTable {
public ColorTable() {
AbstractTableModel tableModel = new AbstractTableModel() {
public Class getColumnClass(int column) { return Integer.class; }
public int getColumnCount() { return 6; }
public int getRowCount() { return 10;}
public Object getValueAt(int row,int col) { return new Integer(row * col); }
setModel(tableModel);
setDefaultRenderer(Integer.class,new ColorRenderer(Color.cyan));
this.setRowSelectionAllowed(false);
this.setCellSelectionEnabled(true);
addMouseListener(new MouseAdapter() {
private ColorRenderer renderer;
private JColorChooser chooser = new JColorChooser();
public void mousePressed(MouseEvent e) {
if(e.getModifiers() == MouseEvent.BUTTON3_MASK) {
System.out.print("rowAtPoint(e.getPoint())=" +rowAtPoint(e.getPoint()));
System.out.print( "columnAtPoint(e.getPoint()))=" + columnAtPoint(e.getPoint()));
renderer = (ColorRenderer)getCellRenderer(rowAtPoint(e.getPoint()), columnAtPoint(e.getPoint()));
// chooser.setColor(renderer.getColor());
renderer.setColor(chooser.showDialog((Component)e.getSource(),"Choose Cell Color",chooser.getColor()));
class ColorRenderer extends DefaultTableCellRenderer {
private Color cellColor;
public ColorRenderer(Color color) { cellColor = color; }
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
System.out.print("row= " + row + "\n");
System.out.print("column= " + column + "\n");
System.out.print("OBJECT VALUE=" + value.toString());
//Component comp = super.getTableCellRendererComponent(table,value,isSelected,hasFocus,row,column);
super.getTableCellRendererComponent(table,value,isSelected,hasFocus,row,column);
if (isSelected) {
setOpaque(true);
setBackground(cellColor);
else {
setBackground(Color.white);
setForeground(Color.black);
return this;
public void setColor(Color color)
cellColor = color;
ColorTable.this.repaint();
public Color getColor() { return cellColor; }
public static void main(String[] args) {
JFrame frame = new JFrame();
JPanel panel = new JPanel();
ColorTable table = new ColorTable();
panel.add(table);
frame.getContentPane().add(panel);
frame.setSize(500,250);
frame.setVisible(true);My code below is supposed to change the color
of a single JTable cell however its not working.
Could anyone please tell me why?
Here's the code:
import java.awt.*;
import javax.swing.table.*;
import javax.swing.*;
import java.awt.event.*;
public class ColorTable extends JTable {
public ColorTable() {
AbstractTableModel tableModel = new AbstractTableModel() {
public Class getColumnClass(int column) { return Integer.class; }
public int getColumnCount() { return 6; }
public int getRowCount() { return 10;}
public Object getValueAt(int row,int col) { return new Integer(row * col); }
setModel(tableModel);
setDefaultRenderer(Integer.class,new ColorRenderer(Color.cyan));
this.setRowSelectionAllowed(false);
this.setCellSelectionEnabled(true);
addMouseListener(new MouseAdapter() {
private ColorRenderer renderer;
private JColorChooser chooser = new JColorChooser();
public void mousePressed(MouseEvent e) {
if(e.getModifiers() == MouseEvent.BUTTON3_MASK) {
System.out.print("rowAtPoint(e.getPoint())=" +rowAtPoint(e.getPoint()));
System.out.print( "columnAtPoint(e.getPoint()))=" + columnAtPoint(e.getPoint()));
renderer = (ColorRenderer)getCellRenderer(rowAtPoint(e.getPoint()), columnAtPoint(e.getPoint()));
// chooser.setColor(renderer.getColor());
renderer.setColor(chooser.showDialog((Component)e.getSource(),"Choose Cell Color",chooser.getColor()));
class ColorRenderer extends DefaultTableCellRenderer {
private Color cellColor;
public ColorRenderer(Color color) { cellColor = color; }
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
System.out.print("row= " + row + "\n");
System.out.print("column= " + column + "\n");
System.out.print("OBJECT VALUE=" + value.toString());
//Component comp = super.getTableCellRendererComponent(table,value,isSelected,hasFocus,row,column);
super.getTableCellRendererComponent(table,value,isSelected,hasFocus,row,column);
if (isSelected) {
setOpaque(true);
setBackground(cellColor);
else {
setBackground(Color.white);
setForeground(Color.black);
return this;
public void setColor(Color color)
cellColor = color;
ColorTable.this.repaint();
public Color getColor() { return cellColor; }
public static void main(String[] args) {
JFrame frame = new JFrame();
JPanel panel = new JPanel();
ColorTable table = new ColorTable();
panel.add(table);
frame.getContentPane().add(panel);
frame.setSize(500,250);
frame.setVisible(true); -
Tab transversal while using JTextArea as a JTable cell editor..
I'm working on a project that will use a JTable with a JTextArea cell editor to create a chart for classroom scheduling. Searching on Google, I found a way to use a JTextArea as a cell editor and render the cell properly. However, when editing a cell, pressing the Tab key inserts a tab, rather than leaving the cell and going to the next one, as happens with just a regular JTable. In fact, none of the keyboard shortcuts that work on a JTable work once the JTextArea cell editor is used. Does anyone know of any way to resolve this? Below is some code I'm using to create a sample GUI, just to verify that I can do this. Another question is would it be easier to use a bunch of JLabels and JTextAreas, remove the padding from those JTextAreas, and try to allow for Tab transversals between stand-alone JTextAreas, rather than JTextAreas as JTable cell editors?
Thanks!
package edu.elon.table;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;
public class GUI
private JFrame frame;
private String[] columnNames = {"Classroom", "8:00-9:10", "9:25-10:35",
"10:50-12:00", "12:15-1:25", "1:40-2:50", "1:40-3:20 (MW)",
"3:35-5:15 (MW)", "5:30-7:10 (MW)"};
private Object[][] data = {columnNames,
{"ALAM 201 (42)\nENG 110 LAB", "", "", "", "", "", "", "", ""},
{"ALAM 202 (42)\nDP/DVD", "", "", "", "", "", "", "", ""},
{"ALAM 203 (38)\nDP/DVD", "", "", "", "", "", "", "", ""},
{"ALAM 205 (40)\n", "", "", "", "", "", "", "", ""},
{"ALAM 206 (39)\nSINK, TV/VCR", "", "", "", "", "", "", "", ""},
{"ALAM 207 (40+)\nDP/DVD", "", "", "", "", "", "", "", ""},
{"ALAM 214 (38)\nTV/VCR", "", "", "", "", "", "", "", ""},
{"ALAM 215 (42)\nTV/VCR", "", "", "", "", "", "", "", ""},
{"ALAM 216 (42)\n", "", "", "", "", "", "", "", ""},
{"ALAM 301 (40)\nTV/VCR", "", "", "", "", "", "", "", ""},
{"ALAM 302 (38)\nDP/DVD", "", "", "", "", "", "", "", ""},
{"ALAM 304 (35)\nFRENCH", "", "", "", "", "", "", "", ""},
{"ALAM 314 (30)\nDP, PSY, COMPUTER ASSISTED", "", "", "", "", "", "",
{"ALAM 315 (40)\nPC LAB, DP/DVD", "", "", "", "", "", "", "", ""}};
private JTable table;
public GUI()
frame = new JFrame();
table = new JTable(data, columnNames);
table.setRowHeight(table.getRowHeight()*2);
TableColumnModel cModel = table.getColumnModel();
TextAreaRenderer renderer = new TextAreaRenderer();
TextAreaEditor editor = new TextAreaEditor();
for (int i = 0; i < cModel.getColumnCount(); i++)
cModel.getColumn(i).setCellRenderer(renderer);
cModel.getColumn(i).setCellEditor(editor);
frame.setLayout(new GridLayout(1,0));
frame.add(table);
frame.pack();
frame.setVisible(true);
public static void main (String[] args)
GUI gui = new gui();
* Written by Dr. Heinz Kabutz, found through online newsletter via Google.
class TextAreaRenderer extends JTextArea
implements TableCellRenderer {
private final DefaultTableCellRenderer adaptee =
new DefaultTableCellRenderer();
/** map from table to map of rows to map of column heights */
private final Map cellSizes = new HashMap();
public TextAreaRenderer() {
setLineWrap(true);
setWrapStyleWord(true);
public Component getTableCellRendererComponent(//
JTable table, Object obj, boolean isSelected,
boolean hasFocus, int row, int column) {
// set the colours, etc. using the standard for that platform
adaptee.getTableCellRendererComponent(table, obj,
isSelected, hasFocus, row, column);
setForeground(adaptee.getForeground());
setBackground(adaptee.getBackground());
setBorder(adaptee.getBorder());
setFont(adaptee.getFont());
setText(adaptee.getText());
// This line was very important to get it working with JDK1.4
TableColumnModel columnModel = table.getColumnModel();
setSize(columnModel.getColumn(column).getWidth(), 100000);
int height_wanted = (int) getPreferredSize().getHeight();
addSize(table, row, column, height_wanted);
height_wanted = findTotalMaximumRowSize(table, row);
if (height_wanted != table.getRowHeight(row)) {
table.setRowHeight(row, height_wanted);
return this;
private void addSize(JTable table, int row, int column,
int height) {
Map rows = (Map) cellSizes.get(table);
if (rows == null) {
cellSizes.put(table, rows = new HashMap());
Map rowheights = (Map) rows.get(new Integer(row));
if (rowheights == null) {
rows.put(new Integer(row), rowheights = new HashMap());
rowheights.put(new Integer(column), new Integer(height));
* Look through all columns and get the renderer. If it is
* also a TextAreaRenderer, we look at the maximum height in
* its hash table for this row.
private int findTotalMaximumRowSize(JTable table, int row) {
int maximum_height = 0;
Enumeration columns = table.getColumnModel().getColumns();
while (columns.hasMoreElements()) {
TableColumn tc = (TableColumn) columns.nextElement();
TableCellRenderer cellRenderer = tc.getCellRenderer();
if (cellRenderer instanceof TextAreaRenderer) {
TextAreaRenderer tar = (TextAreaRenderer) cellRenderer;
maximum_height = Math.max(maximum_height,
tar.findMaximumRowSize(table, row));
return maximum_height;
private int findMaximumRowSize(JTable table, int row) {
Map rows = (Map) cellSizes.get(table);
if (rows == null) return 0;
Map rowheights = (Map) rows.get(new Integer(row));
if (rowheights == null) return 0;
int maximum_height = 0;
for (Iterator it = rowheights.entrySet().iterator();
it.hasNext();) {
Map.Entry entry = (Map.Entry) it.next();
int cellHeight = ((Integer) entry.getValue()).intValue();
maximum_height = Math.max(maximum_height, cellHeight);
return maximum_height;
* Written by Dr. Heinz Kabutz, found through online newsletter via Google.
class TextAreaEditor extends DefaultCellEditor
public TextAreaEditor() {
super(new JTextField());
final JTextArea textArea = new JTextArea();
textArea.setWrapStyleWord(true);
textArea.setLineWrap(true);
JScrollPane scrollPane = new JScrollPane(textArea);
scrollPane.setBorder(null);
editorComponent = scrollPane;
delegate = new DefaultCellEditor.EditorDelegate() {
public void setValue(Object value)
textArea.setText((value != null) ? value.toString() : "");
public Object getCellEditorValue()
return textArea.getText();
}Using the KeyEvent manager and playing around with the JTextArea, I was able to get a JTable using JTextAreas as the cell editors that worked very close to the way the regular JTable works. You have to hit Tab twice to shift focus to another cell, or hit Tab once and then an arrow key. Also, Alt-Enter will allow you to enter a cell for editing. All of the changes were made to the TextAreaEditor class, which should now read as follows:
class TextAreaEditor extends DefaultCellEditor implements KeyListener
private int lastKeyCode;
public TextAreaEditor(final JTable table) {
super(new JTextField());
lastKeyCode = KeyEvent.CTRL_DOWN_MASK;
final JTextArea textArea = new JTextArea();
textArea.setWrapStyleWord(true);
textArea.setLineWrap(true);
textArea.addKeyListener(this);
textArea.setFocusable(true);
textArea.setFocusAccelerator((char) KeyEvent.VK_ENTER);
JScrollPane scrollPane = new JScrollPane(textArea);
scrollPane.setBorder(null);
scrollPane.setFocusable(false);
editorComponent = scrollPane;
delegate = new DefaultCellEditor.EditorDelegate() {
public void setValue(Object value) {
textArea.setText((value != null) ? value.toString() : "");
public Object getCellEditorValue() {
return textArea.getText();
public void keyTyped(KeyEvent ke)
// TODO Auto-generated method stub
public void keyPressed(KeyEvent ke)
if (ke.getKeyCode() == KeyEvent.VK_TAB)
ke.consume();
KeyboardFocusManager.getCurrentKeyboardFocusManager()
.focusNextComponent();
return;
if (ke.getKeyCode() == KeyEvent.VK_TAB && ke.isShiftDown())
ke.consume();
KeyboardFocusManager.getCurrentKeyboardFocusManager()
.focusPreviousComponent();
return;
if ((lastKeyCode == KeyEvent.CTRL_DOWN_MASK) &&
(ke.getKeyCode() == KeyEvent.VK_ENTER))
ke.consume();
editorComponent.requestFocus();
else
lastKeyCode = ke.getKeyCode();
public void keyReleased(KeyEvent ke)
// TODO Auto-generated method stub
} -
Custom JTable cell editor problem
I have a custom JTable cell editor which is a JPanel with 2 JtextFields, One for a name, the other for a data value. My problem lies in when the the cell is selected and then the user start typing. The JTextfield outline shows up, but there is no carat. I can only edit the cell when I click the mouse in it again. I have my isCellEditable method set to only allow editing on 2 mouse clicks, but I did try it with just returning true and had the same problem. Please help.
Code:
class cellValue {
String name;
String data;
Color nameColor;
Color dataColor;
Font font;
public cellValue(String n, String d, Color nC, Color dC, Font ff){
name = n;
data = d;
nameColor = nC;
dataColor = dC;
font = ff;
} //end class
public class TextFieldCellEditor extends JPanel implements TableCellRenderer, TableCellEditor{
private EventListenerList listenerList = new EventListenerList();
private ChangeEvent event = new ChangeEvent(this);
private cellValue s;
private int e_row=0;
private int e_col=0;
private JTextField ta;
private JTextField tb;
public TextFieldCellEditor() {
setLayout(new GridBagLayout());
ta = new JTextField();
tb = new JTextField();
tb.setHorizontalAlignment(SwingConstants.RIGHT);
add(ta, new GridBagConstraints(0,0,1,1,0.6,0.0,java.awt.GridBagConstraints.WEST,java.awt.GridBagConstraints.BOTH,new Insets(0,1,0,0),0,0));
add(new JLabel(" "),new GridBagConstraints(1,0,1,1,0.1,0.0,java.awt.GridBagConstraints.WEST,java.awt.GridBagConstraints.BOTH,new Insets(0,1,0,0),0,0));
add(tb, new GridBagConstraints(2,0,1,1,0.3,0.0,java.awt.GridBagConstraints.EAST,java.awt.GridBagConstraints.BOTH,new Insets(0,1,0,0),0,0));
} //end init
public Component getTableCellRendererComponent(JTable table, Object value,boolean isSelected,
boolean hasFocus,int row, int column) {
s = (cellValue)value;
e_row = row;
e_col = column;
ta.setText(s.name);
tb.setText(s.data);
ta.setFont(s.font);
tb.setFont(s.font);
ta.setForeground(s.nameColor);
tb.setForeground(s.dataColor);
setForeground(table.getForeground());
setBackground(table.getBackground());
ta.setBackground(table.getBackground());
tb.setBackground(table.getBackground());
ta.setCaretColor(Color.WHITE);
tb.setCaretColor(Color.WHITE);
return (JComponent)(this);
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
return (getTableCellRendererComponent(table, value,isSelected, true, row, column));
public boolean isCellEditable(EventObject e) {
if (e instanceof MouseEvent) {
return ((MouseEvent)e).getClickCount() >= 2;
} return true;
// return true;
public boolean shouldSelectCell(EventObject anEvent) {
return (true);
public void cancelCellEditing() {
public boolean stopCellEditing() {
fireEditingStopped();
return (true);
public Object getCellEditorValue() {
return (ta.getText());
public void addCellEditorListener(CellEditorListener l){
try {
SwingUtilities.invokeLater(
new Runnable() {
public void run() {requestFocus();}
} catch (Exception e) {};
listenerList.add(CellEditorListener.class, l);
public void removeCellEditorListener(CellEditorListener l) {
listenerList.remove(CellEditorListener.class, l);
protected void fireEditingStopped(){
Object[] listeners = listenerList.getListenerList();
for (int i = listeners.length - 2; i >= 0; i -= 2)
((CellEditorListener)listeners[i+1]).editingStopped(event);
protected void fireEditingCanceled() {
Object[] listeners = listenerList.getListenerList();
for (int i = listeners.length - 2; i >= 0; i -= 2)
((CellEditorListener)listeners[i+1]).editingCanceled(event);
} //end classThanks again for the repley.
I tried removing the celleditorlistener and using the setSurrenderFocusOnKeystroke, but it did not work. The textfield is editable;
I did change:
public void addCellEditorListener(CellEditorListener l){
try {
SwingUtilities.invokeLater(
new Runnable() {
public void run() {ta.requestFocus();}
} catch (Exception e) {};
listenerList.add(CellEditorListener.class, l);
}This allows the first textfield to request focus and this seems to work. But when I highlight a cell, then start typing, the first character I type puts me into the editor, but it is lost. Example:
I type hello
and get ello in the cell. Then when I press enter the input is excepted and the selection goes to the next cell, but I cannot move the Highlight cursor at all, seems locked. The only way I can continue to the next cell is to use the mouse.
You said you had a cell editor working. Would you care to share as an example. This is killing me to get this to work properly.
Thanks again
Dave -
Can not show the JCheckBox in JTable cell
I want to place a JCheckBox in one JTable cell, i do as below:
i want the column "d" be a check box which indicates "true" or "false".
String[] columnNames = {"a","b","c","d"};
Object[][] rowData = {{"", "", "", Boolean.FALSE}};
tableModel = new DefaultTableModel(rowData, columnNames);
dataTable = new JTable(tableModel);
dataTable.getColumnModel().getColumn(3).setCellEditor(new DefaultCellEditor(new JCheckBox()));
But when i run it, the "d" column show the string "false" or "true", not the check box i wanted.
I do not understand it, can you help me?
Thank you very much!
coral9527Do not use DefaultTableModel, create your own table model and you should implement the method
getColumnClass to display the boolean as checkbox ...
I hope the following colde snippet helps you :
class MyModel extends AbstractTableModel {
private String[] columnNames = {"c1",
"c2"};
public Object[][] data ={{Boolean.valueOf(true),"c1d1"}};
public int getColumnCount() {
//System.out.println("Calling getColumnCount");
return columnNames.length;
public int getRowCount() {
//System.out.println("Calling row count");
return data.length;
public String getColumnName(int col) {
return columnNames[col];
public Object getValueAt(int row, int col) {
return data[row][col];
* JTable uses this method to determine the default renderer/
* editor for each cell. If we didn't implement this method,
* then the last column would contain text ("true"/"false"),
* rather than a check box.
public Class getColumnClass(int c) {
return getValueAt(0, c).getClass();
* Don't need to implement this method unless your table's
* editable.
public boolean isCellEditable(int row, int col) {
//Note that the data/cell address is constant,
//no matter where the cell appears onscreen.
return true;
* Don't need to implement this method unless your table's
* data can change.
public void setValueAt(Object value, int row, int col) {
data[row][col] = value;
fireTableCellUpdated(row, col); -
How to write an element in a JTable Cell
Probably it's a stupid question but I have this problem:
I have a the necessity to build a JTable in which, when I edit a cell and I push a keyboard button, a new Frame opens to edit the content of the cell.
But the problem is how to write something in the JTable cell, before setting its model. Because, I know, setCellAT() method of JTree inserts the value in the model and not in the table view. And repainting doesn't function!
What to do??
ThanksHi there
Depending on your table model you should normally change the "cell value" of the tablemodel.
This could look like:
JTable table = new JTable();
TableModel model = table.getModel();
int rowIndex = 0, columnIndex = 0;
model.setValueAt("This is a test", rowIndex, columnIndex);
The tablemodel should then fire an event to the view (i.e. JTable) and the table should be updated.
Hope this helps you -
Problem in event handling of combo box in JTable cell
Hi,
I have a combo box as an editor for a column cells in JTable. I have a event listener for this combo box. When ever I click on the JTable cell whose editor is combo box,
I get the following exception,
Exception occurred during event dispatching:
java.lang.NullPointerException
at javax.swing.plaf.basic.BasicTableUI$MouseInputHandler.setDispatchComponent(Unknown Source)
at javax.swing.plaf.basic.BasicTableUI$MouseInputHandler.mousePressed(Unknown Source)
at java.awt.AWTEventMulticaster.mousePressed(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Can any one tell me how to over come this problem.
Thanks,
RaghuHere's an example of the model I used in my JTable. I've placed 2 comboBoxes with no problems.
Hope this helps.
public class FileModel5 extends AbstractTableModel
public boolean isEditable = false;
protected static int NUM_COLUMNS = 3;
// initialize number of rows to start out with ...
protected static int START_NUM_ROWS = 0;
protected int nextEmptyRow = 0;
protected int numRows = 0;
static final public String file = "File";
static final public String mailName = "Mail Id";
static final public String postName = "Post Office Id";
static final public String columnNames[] = {"File", "Mail Id", "Post Office Id"};
// List of data
protected Vector data = null;
public FileModel5()
data = new Vector();
public boolean isCellEditable(int rowIndex, int columnIndex)
// The 2nd & 3rd column or Value field is editable
if(isEditable)
if(columnIndex > 0)
return true;
return false;
* JTable uses this method to determine the default renderer/
* editor for each cell. If we didn't implement this method,
* then the last column would contain text ("true"/"false"),
* rather than a check box.
public Class getColumnClass(int c)
return getValueAt(0, c).getClass();
* Retrieves number of columns
public synchronized int getColumnCount()
return NUM_COLUMNS;
* Get a column name
public String getColumnName(int col)
return columnNames[col];
* Retrieves number of records
public synchronized int getRowCount()
if (numRows < START_NUM_ROWS)
return START_NUM_ROWS;
else
return numRows;
* Returns cell information of a record at location row,column
public synchronized Object getValueAt(int row, int column)
try
FileRecord5 p = (FileRecord5)data.elementAt(row);
switch (column)
case 0:
return (String)p.file;
case 1:
return (String)p.mailName;
case 2:
return (String)p.postName;
catch (Exception e)
return "";
public void setValueAt(Object aValue, int row, int column)
FileRecord5 arow = (FileRecord5)data.elementAt(row);
arow.setElementAt((String)aValue, column);
fireTableCellUpdated(row, column);
* Returns information of an entire record at location row
public synchronized FileRecord5 getRecordAt(int row) throws Exception
try
return (FileRecord5)data.elementAt(row);
catch (Exception e)
throw new Exception("Record not found");
* Used to add or update a record
* @param tableRecord
public synchronized void updateRecord(FileRecord5 tableRecord)
String file = tableRecord.file;
FileRecord5 p = null;
int index = -1;
boolean found = false;
boolean addedRow = false;
int i = 0;
while (!found && (i < nextEmptyRow))
p = (FileRecord5)data.elementAt(i);
if (p.file.equals(file))
found = true;
index = i;
} else
i++;
if (found)
{ //update
data.setElementAt(tableRecord, index);
else
if (numRows <= nextEmptyRow)
//add a row
numRows++;
addedRow = true;
index = nextEmptyRow;
data.addElement(tableRecord);
//Notify listeners that the data changed.
if (addedRow)
nextEmptyRow++;
fireTableRowsInserted(index, index);
else
fireTableRowsUpdated(index, index);
* Used to delete a record
public synchronized void deleteRecord(String file)
FileRecord5 p = null;
int index = -1;
boolean found = false;
int i = 0;
while (!found && (i < nextEmptyRow))
p = (FileRecord5)data.elementAt(i);
if (p.file.equals(file))
found = true;
index = i;
} else
i++;
if (found)
data.removeElementAt(i);
nextEmptyRow--;
numRows--;
fireTableRowsDeleted(START_NUM_ROWS, numRows);
* Clears all records
public synchronized void clear()
int oldNumRows = numRows;
numRows = START_NUM_ROWS;
data.removeAllElements();
nextEmptyRow = 0;
if (oldNumRows > START_NUM_ROWS)
fireTableRowsDeleted(START_NUM_ROWS, oldNumRows - 1);
fireTableRowsUpdated(0, START_NUM_ROWS - 1);
* Loads the values into the combo box within the table for mail id
public void setUpMailColumn(JTable mapTable, ArrayList mailList)
TableColumn col = mapTable.getColumnModel().getColumn(1);
javax.swing.JComboBox comboMail = new javax.swing.JComboBox();
int s = mailList.size();
for(int i=0; i<s; i++)
comboMail.addItem(mailList.get(i));
col.setCellEditor(new DefaultCellEditor(comboMail));
//Set up tool tips.
DefaultTableCellRenderer renderer = new DefaultTableCellRenderer();
renderer.setToolTipText("Click for mail Id list");
col.setCellRenderer(renderer);
//Set up tool tip for the mailName column header.
TableCellRenderer headerRenderer = col.getHeaderRenderer();
if (headerRenderer instanceof DefaultTableCellRenderer)
((DefaultTableCellRenderer)headerRenderer).setToolTipText(
"Click the Mail Id to see a list of choices");
* Loads the values into the combo box within the table for post office id
public void setUpPostColumn(JTable mapTable, ArrayList postList)
TableColumn col = mapTable.getColumnModel().getColumn(2);
javax.swing.JComboBox combo = new javax.swing.JComboBox();
int s = postList.size();
for(int i=0; i<s; i++)
combo.addItem(postList.get(i));
col.setCellEditor(new DefaultCellEditor(combo));
//Set up tool tips.
DefaultTableCellRenderer renderer = new DefaultTableCellRenderer();
renderer.setToolTipText("Click for post office Id list");
col.setCellRenderer(renderer);
//Set up tool tip for the mailName column header.
TableCellRenderer headerRenderer = col.getHeaderRenderer();
if (headerRenderer instanceof DefaultTableCellRenderer)
((DefaultTableCellRenderer)headerRenderer).setToolTipText(
"Click the Post Office Id to see a list of choices");
}
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