Cell Editor and Structures

Hi,
I have a requirement to use a field in a previous row of a query result in a calculation in the current row.
My first question is, is this possible ? or does anybosy have any suggestions for a workaround
In trying to determine if it is possible I was going to investigate the use of the Cell Editor. However this requires that I have 2 structures in my query. I have therefore created a reuseable structure for the key figures, but the structure for the characteristics does not display the characteristics selected in either the query definition or the query results. Because of this I cannot proceed with the Cell editor.
Can any one help with defining characteristic structures ?
Can anybody recommend a good book for BW query definition/tips/tricks ?

Hi Bhanu.
I am creating the structure as you say by right clicking
on the 'rows' heading and creating a new structure.
Then I am right clicking on the new structure and dragging and dropping the required characteristics into the structure. eg Plant and Material. I am changing the description eg 'MM Data' Then after closing the dialog I do 'save as' to save the structure as reusable. All appears to work fine. BUT I was expecting the rows of the query to then contain Plant and Material, instead they have a heading of 'MM data' with no values for either Plant or Material showing.
I am therefore not sure that I have grasped the point of reusable structures. Having said that, if I create one in exactly the same way for key figures then it does work in the way I was expecting. ie The key figures contained in the structure are visible in the report.
The actual rqmt I have is to be able to multiply 2 key figures together from separate rows in the query results. i don't think its possible, but was trying to exhaust all avenues of thought before going back to the users with alternatives.
Rgds
Simon

Similar Messages

Differrent CELL Editors and Renderers in a Column

Is it possible to have different cell editors and renderers within a single column? I would like to have text, CheckBox and ComboBox on different rows and within the same column.
If yes, pls point me to somthing that describes this process.

One thing that is often overlooked,due to a poor naming choice by Sun, is that a Renderer is not forced to return this as the component that will ultimately paint the cell: the only job of a cell renderer (as per the interface TableCellRenderer ) is to provide a component to do the painting. It is free to re-used the same component as much as possible (as a memory optimization), but it can also return either JComponent out of a set of 3.
For example:
public class MyRenderer implements TableCellRenderer {
    private JLabel componentThatRendersFoos;
    private JLabel componentThatRendersBars;
    public void getTableCellRendererComponent(...) {
        if (whatever criterion that identifies the cell as a foo) {
            componentThatRendersFoos.setBackground(...);
            return componentThatRendersFoos;
        else if (whatever criterion that identifies the cell as a bar) {
            componentThatRendersBars.setBackground(...);
            return componentThatRendersBars;
    }And similarly for editors.
This has the advantage to enable to configure the renderer without havingto subclass JTable.
Edited by: jduprez on Jan 20, 2011 10:51 PM
Here is a reference to a discussion about the mixed concepts in renderers: {message:id=9161690}

Small issue with custom table cell editor and unwanted table row selection

I'm using a custom table cell editor to display a JTree. Thing i notice is that when i select a value in the tree pop-up, the pop-up closes (as it should) but then every table row, from the editing row to the row behind the pop-up when i selected the value becomes highlighted. I'm thinking this is a focus issue, but it thought i took care of that. To clairfy, look at this: Before . Notice how the "Straightening" tree item is roughly above the "Stock Thickness" table row? When i select Straightening, this is what happens to my table: After .
My TreeComboBox component:
public class TreeComboBox extends JPanel implements MouseListener {
    private JTextField itemField;
    private TreeModel treeModel;
    private ArrayList<ActionListener> actionListeners = new ArrayList<ActionListener>();
    private Object selectedItem;
     * Creates a new <code>TreeComboBox</code> instance.
     * @param treeModel the tree model to be used in the drop-down selector.
    public TreeComboBox(TreeModel treeModel) {
        this(treeModel, null);
     * Creates a new <code>TreeComboBox</code> instance.
     * @param treeModel the tree model to be used in the drop-down selector.
     * @param selectedItem tree will expand and highlight this item.
    public TreeComboBox(TreeModel treeModel, Object selectedItem) {
        this.treeModel = treeModel;
        this.selectedItem = selectedItem;
        initComponents();
     * Returns the current drop-down tree model.
     * @return the current <code>TreeModel</code> instance.
    public TreeModel getTreeModel() {
        return treeModel;
     * Sets the tree model.
     * @param treeModel a <code>TreeModel</code> instance.
    public void setTreeModel(TreeModel treeModel) {
        this.treeModel = treeModel;
     * Returns the selected item from the drop-down selector.
     * @return the selected tree object.
    public Object getSelectedItem() {
        return selectedItem;
     * Sets the selected item in the drop-down selector.
     * @param selectedItem tree will expand and highlight this item.
    public void setSelectedItem(Object selectedItem) {
        this.selectedItem = selectedItem;
        String text = selectedItem != null ? selectedItem.toString() : "";
        itemField.setText(text);
        setToolTipText(text);
     * Overridden to enable/disable all child components.
     * @param enabled flat to enable or disable this component.
    public void setEnabled(boolean enabled) {
        itemField.setEnabled(enabled);
        super.setEnabled(enabled);
    public void addActionListener(ActionListener listener) {
        actionListeners.add(listener);
    public void removeActionListener(ActionListener listener) {
        actionListeners.remove(listener);
    // MouseListener implementation
    public void mouseClicked(MouseEvent e) {
    public void mouseEntered(MouseEvent e) {
    public void mouseExited(MouseEvent e) {
    public void mousePressed(MouseEvent e) {
    public void mouseReleased(MouseEvent e) {
        showPopup();
    private void initComponents() {
        setLayout(new GridBagLayout());
        itemField = new JTextField();
        itemField.setEditable(false);
        itemField.setText(selectedItem != null ? selectedItem.toString() : "");
        itemField.addMouseListener(this);
        add(itemField, new GridBagConstraints(0, 0, 1, 1, 1.0, 0.0,
                GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(0, 0, 0, 0), 0, 0));
    private void showPopup() {
        final TreePopup popup = new TreePopup();
        final TreeComboBox tcb = this;
        final int x = itemField.getX();
        final int y = itemField.getY() + itemField.getHeight();
        int width = itemField.getWidth() + popupButton.getWidth();
        Dimension prefSize = popup.getPreferredSize();
        prefSize.width = width;
        popup.setPreferredSize(prefSize);
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                popup.show(tcb, x, y);
                popup.requestFocusInWindow();
    private void fireActionPerformed() {
        ActionEvent e = new ActionEvent(this, ActionEvent.ACTION_PERFORMED, "TreeComboBoxSelection");
        for (ActionListener listener : actionListeners) {
            listener.actionPerformed(e);
    private class TreePopup extends JPopupMenu {
        private JTree tree;
        private JScrollPane scrollPane;
        public TreePopup() {
            initComponents();
            initData();
        private void initData() {
            if (treeModel != null) {
                tree.setModel(treeModel);
        private void initComponents() {
            setFocusable(true);
            setFocusCycleRoot(true);
            tree = new JTree();
            tree.setRootVisible(false);
            tree.setShowsRootHandles(true);
            tree.setFocusable(true);
            tree.setFocusCycleRoot(true);
            tree.addTreeSelectionListener(new TreeSelectionListener() {
                public void valueChanged(TreeSelectionEvent e) {
                    tree_valueChanged(e);
            scrollPane = new JScrollPane(tree);
            add(scrollPane);
        private void tree_valueChanged(TreeSelectionEvent e) {
            DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();
            setSelectedItem(node.getUserObject());
            fireActionPerformed();
            this.setVisible(false);
}My TreeComboBoxTableCellEditor:
public class TreeComboBoxTableCellEditor extends AbstractCellEditor implements TableCellEditor, ActionListener {
    protected TreeComboBox treeComboBox;
    protected ArrayList<CellEditorListener> cellEditorListeners = new ArrayList<CellEditorListener>();
    public TreeComboBoxTableCellEditor(TreeComboBox treeComboBox) {
        this.treeComboBox = treeComboBox;
        treeComboBox.addActionListener(this);
    public Object getCellEditorValue() {
        return treeComboBox.getSelectedItem();
    public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
        treeComboBox.setSelectedItem(value);
        return treeComboBox;
    public void actionPerformed(ActionEvent e) {
        stopCellEditing();
}Any thoughts?
Edited by: MiseryMachine on Apr 3, 2008 1:21 PM
Edited by: MiseryMachine on Apr 3, 2008 1:27 PM

As I said, you have to have empty context elements before additional rows will be open for input.
For instance if you want to start with 5 rows available for input do the following to your internal table that you will bind:
data itab type standard table of sflight.
do 5 times.
append initial line to itab.
enddo.
context_node->bind_table( itab ).
The other option if you need n number of rows is to add a button to the table toolbar for adding more rows. When this button is pressed, you add a new context element to the node - thereby creating a new empty row in the table.

Custom JTable cell editors and persistence

I have a JTable with an underlying data model (an extension of AbstractTableModel) that uses custom cell editors in the last column. The cell editor in that column, for a given row, depends on the value selected in another column of the same row. The cell editors include text, date, list, and tree editors (the last one in a separate dialogue). The number of rows is changeable.
I have need to persist the data for a populated table from time to time, for restoration later on. I've achieved that, such that the data model is recreated, the table appears correct, and the appropriate cell editors activated (by creating new instances of the editors' classes).
However, my problem is that the (custom) cell editors do not reflect the data in the model when editing mode is begun the first time after restoration. Eg. the text editor is always empty, the list editor shows the first item, and no node is selected in the tree editor.
If I've restored the model correctly, should the editors properly reflect the underlying data when they are set to editing mode?
I suspected not, and thus tried to explicitly 'set' the correct values immediately after each editor is recreated ... but to no avail.
Does anyone have any thoughts, or experience with something similar? I'm happy to supply code.

You can use html tags within Swing, so I think you can do the following:
* MyRenderer.java
* Created on 26 April 2007, 10:27
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
package newpackage;
import java.awt.Component;
import javax.swing.JLabel;
import javax.swing.JTable;
import javax.swing.SwingConstants;
import javax.swing.table.TableCellRenderer;
* @author CS781RJ
public class MyRenderer extends JLabel implements TableCellRenderer
    public MyRenderer()
        setHorizontalTextPosition(SwingConstants.RIGHT);
        setIconTextGap(3);
        setOpaque(true);
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean cellHasFocus, int row, int column)
        if (isSelected)
            setBackground(table.getSelectionBackground());
            setForeground(table.getSelectionForeground());
        else
            setBackground(table.getBackground());
            setForeground(table.getForeground());
        if (value instanceof String)
            if ((value != null) && (value.toString().length() > 0))
                System.out.println("Value: " + value.toString());
                setFont(new java.awt.Font("Tahoma", 0, 11));
                setText("<html>" + value.toString().replaceAll("\n", "<br>") + "</html>");
        return this;
}In the class that has the JTable, use the code AFTER declaring the values, columns, etc:
jTable1.getColumnModel().getColumn(0).setCellRenderer(new MyRenderer());
jTable1.setValueAt("Riz\nJavaid", 0, 0);One thing I haven't done is to resize the cell heights, make sure this is done.
Hope this helps
Riz

JTable cell editor and row selection

I have a JTable with 8 columns and the last column is editable and has a custom table cell editor. The user can edit cells in that column or select a row and use buttons above the table to do such things as delete the row. So far so good. However if the user selects a row by clicking on a cell in the editable column and tries to delete the last row(for example) the row disappears except for the cell in the last column which is left hanging with the cursor in it.
I do a table.clearSelection(). Do I need to set the focus elsewhere in the table?
Help! and thanks.

Before you delete the row, cancel the in-process editing:
if( _table.isEditing() ) {
_table.getCellEditor().cancelCellEditing();
// Delete the row in the model

Cell editors and renderers confusion

HI i went thru some code recently but cud not understand why he is doin that , here is the step
creates editor e1
creates renderer r1
editor e1 has renderer r1 as member var ie we can refer it as e1.r1
in the getTableCellEditorComponent()of e1 method he is returning renderer r1.
table.setCellRenderer(e1)
i am just confused , is ther any advantage of this approach?
am i clear, 7

I can't see any advantage and find this approach rather confusing.
In my opinion, renderer and editor should be separated from each other.
G.

JTable custom cell renderer and editor breaks row sorting

Hello Forum,
I have a JTable on which I set setAutoCreateRowSorter(true); I then hook up a custom cell editor and renderer for the Date class.
this.tblLeden.setDefaultRenderer(Date.class, new DateCellEditor());
this.tblLeden.setDefaultEditor(Date.class, new DateCellEditor());
The sorting for that particular row then breaks, it works fine for every other row. How do I fix this? Just directions where to look would be great too.
Here is my code for the renderer/editor:
(btw this is probably not the best way to do this so any suggestions for optimizing are great too)
import java.awt.Component;
import java.util.Date;
import java.util.EventObject;
import java.util.HashMap;
import java.util.Vector;
import javax.swing.JTable;
import javax.swing.event.CellEditorListener;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
import com.toedter.calendar.JDateChooser;
public class DateCellEditor extends JDateChooser implements TableCellRenderer, TableCellEditor
private static final long serialVersionUID = -5073758499524392257L;
private final Vector<CellEditorListener> listeners = new Vector<CellEditorListener>();
// oops.. lingering objects problem when rows are deleted..
private final HashMap<Integer, JDateChooser> components = new HashMap<Integer, JDateChooser>();
@Override
public final Component getTableCellRendererComponent(final JTable table,
      final Object value, final boolean isSelected, final boolean hasFocus,
      final int row, final int col)
    JDateChooser temp = this.components.get(Integer.valueOf(row));
    if (temp == null)
      temp = new JDateChooser();
      this.components.put(Integer.valueOf(row), temp);
    temp.setDate((Date) value);
    return temp;
@Override
public final Component getTableCellEditorComponent(final JTable table,
      final Object value, final boolean isSelected, final int row,
      final int column)
    JDateChooser temp = this.components.get(Integer.valueOf(row));
    if (temp == null)
      temp = new JDateChooser();
      this.components.put(Integer.valueOf(row), temp);
    temp.setDate((Date) value);
    return temp;
@Override
public final void addCellEditorListener(final CellEditorListener arg0)
    this.listeners.addElement(arg0);
@Override
public final void removeCellEditorListener(final CellEditorListener arg0)
    this.listeners.removeElement(arg0);
@Override
public final void cancelCellEditing()
    return;
@Override
public final Object getCellEditorValue()
    return null;
@Override
public final boolean isCellEditable(final EventObject arg0)
    return true;
@Override
public final boolean shouldSelectCell(final EventObject arg0)
    return true;
@Override
public final boolean stopCellEditing()
    return true;
}

This seems to work:
import java.awt.Component;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.sql.Date;
import java.util.EventObject;
import java.util.HashMap;
import java.util.Vector;
import javax.swing.JTable;
import javax.swing.event.CellEditorListener;
import javax.swing.event.ChangeEvent;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
import com.toedter.calendar.JDateChooser;
public class DateCellEditor implements TableCellRenderer, TableCellEditor, PropertyChangeListener
private static final long serialVersionUID = -5073758499524392257L;
private final Vector<CellEditorListener> listeners = new Vector<CellEditorListener>();
// oops.. lingering objects problem when rows are deleted..
private final HashMap<Integer, JDateChooser> components = new HashMap<Integer, JDateChooser>();
private Date storedValue = null;
@Override
public final Component getTableCellRendererComponent(final JTable table,
      final Object value, final boolean isSelected, final boolean hasFocus,
      final int row, final int col)
    JDateChooser temp = this.components.get(Integer.valueOf(row));
    if (temp == null)
      temp = new JDateChooser();
      temp.addPropertyChangeListener("date", this);
      this.components.put(Integer.valueOf(row), temp);
    temp.setDate((Date) value);
    return temp;
@Override
public final Component getTableCellEditorComponent(final JTable table,
      final Object value, final boolean isSelected, final int row,
      final int column)
    JDateChooser temp = this.components.get(Integer.valueOf(row));
    if (temp == null)
      temp = new JDateChooser();
      temp.addPropertyChangeListener("date", this);
      this.components.put(Integer.valueOf(row), temp);
    temp.setDate((Date) value);
    return temp;
@Override
public final void addCellEditorListener(final CellEditorListener arg0)
    this.listeners.addElement(arg0);
@Override
public final void removeCellEditorListener(final CellEditorListener arg0)
    this.listeners.removeElement(arg0);
@Override
public final void cancelCellEditing()
    return;
@Override
public final Object getCellEditorValue()
    return this.storedValue;
@Override
public final boolean isCellEditable(final EventObject arg0)
    return true;
@Override
public final boolean shouldSelectCell(final EventObject arg0)
    return true;
@Override
public final boolean stopCellEditing()
    return true;
@Override
public final void propertyChange(final PropertyChangeEvent arg0)
    if (((JDateChooser) arg0.getSource()).getDate() == null)
      return;
    this.storedValue = new Date(((JDateChooser) arg0.getSource()).getDate().getTime());
    ChangeEvent event = new ChangeEvent(arg0.getSource());
    for (int i = 0; i < this.listeners.size(); i++)
      this.listeners.elementAt(i).editingStopped(event);
}

How to combine a JFormattedTextField and a button in a cell editor

Outside of a table we have a JFormattedTextField into which the user types an amount. Next to the field is a calculator button. If the user clicks the calculator button, we open a calculator, enable the user to type his calculations, and when he presses OK, we copy the result to the field.
Now we want the field to be a cell editor and to display the button next to the field (in the table cell). How can we do this? Do I have to make the button a separate column, or can I combine the field and button in 1 column?
Thanks,
Eli

Hi,
Try like this:
DATA: BEGIN OF line,
      col1 TYPE i,
      col2 TYPE i,
      END OF line.
DATA itab LIKE STANDARD TABLE OF line.
data ch(1) type c.
PERFORM fill CHANGING itab.
PERFORM out USING itab.
FORM fill CHANGING f_itab LIKE itab.
DATA f_fill LIKE LINE OF f_itab.
DO 3 TIMES.
    f_fill-col1 = sy-index.
    f_fill-col2 = sy-index ** 2.
    APPEND f_fill TO f_itab.
ENDDO.
ENDFORM.                    "FILL
FORM out USING value(f_itab) LIKE itab.
DATA f_fill LIKE LINE OF f_itab.
write ch as checkbox.
LOOP AT f_itab INTO f_fill.
    WRITE:/ f_fill-col1, f_fill-col2.
ENDLOOP.
Regards,
Bhaskar
ENDFORM.                    "OUT

Is it OK to re-use 1 instance of editors and renderers?

Hi,
The simple version of the question, is can I make 1 instance of my custom cell editor and cell renderer classes and safely use it in all my JTable instances?
For example, I have a DateRenderer class, and instantiate it in a static member, and use it in all Date columns and tables, many of which will be instatiated at one time. If a column needs a non-default format, then I guess I'd create a special instance for it, other wise it would use the default instance.
It seems to be OK so far, but but my program hasn't received any serious usage yet.
As to why, I'm thinking this way, I've been messing around with CellEditors and renderers and despite wanting to use default functionality whenver possible, I find that I'm using custom versions for every situation... so if possible, I'd like to keep the number of instances to a minimum.
Regards
Iain

OK, I see what you mean.
Stop cell editing on focus lost isn't the default behaviour, but I've had to use it anyway (it seems to make sense).
The reason I asked is that, to get the behaviour that I want, it looks like I'll have to have my custom renderers and editors on every column of every table so I'd like to avoid unneccessary instantiation.
I'm aiming for a system where:
- 1 click selects the row (default behaviour),
- 2 clicks starts editing the cell (also default),
- but tabbing or pressing enter after editing a cell keeps you in editing mode.
I don't suppose that many people here have had experience with this, but entering Japanese (and presumably other non ascii type character sets) using MS's IME doesn't work very well with the standard JTable behaviour. If you don't double click, the entered japanese text appears in a little IME window somewhere on the screen (no neccessarily near the editing cell) and just gets lost when you press enter. You have to double click every time, and I can't see the users accepting that.
I'll be investigating this over tme, and hopefully will be able to get it working smoothly.
Thanks,
Iain

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..
-Alan

I 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);
}

Cell Editor for a JTable within A JTable Cell

My individual cells each contain a seperate JTable and I need to write a cell editor for it. I'm not really sure how to write one so if someone show me where I can find some useful examples of such a cell editor I would greatly appreciate it. Thank you for your time. :-)

So, you have a big table whose cells each contain a little table. I assume you already have the little tables working correctly with cell editors and so on, and you want to write a cell editor for the big table. Correct?
My problem with this is that I can't imagine how this would actually work in practice. Suppose I click on a cell in the big table; then the cell renderer displays the appropriate little table. At this point should I see one of the cells in that little table selected, and should I be able to use the Tab key to move around the little table? And if so, then I can't use the Tab key to move around the big table. Next, suppose I press F2 indicating that I want to edit the little table. What should change? Should I now be able to tab around the little table, whereas I couldn't before? And if so, how do I indicate that I have stopped editing the little table? Pressing Enter indicates to the little table's cell editor that its editing is finished, but how should I tell the big table's cell editor that its editing is finished?
Perhaps if you can answer this, you may have a better idea of how to solve your problem. Sorry I only have questions and not answers.

Creating a Cell Editor for a JTree

Hi...
I would like to be able to edit the nodes of a JTree dynamically, but I'm not sure how to do it. I have unsuccessfully tried to implement a celleditor by extended the DefaultTreeCellEditor. The editing works fine, but once the cell has been edited, I get a ClassCastException.
I know that I need to get the edited value and then make appropriate changes to the DefaultMutableTreeNode object stored, but I am not sure where to do all this. I would really appreciate some tips on where to get the edited value entered, and how I can access the object being edited. Thanks.
..VJ..

So, you have a big table whose cells each contain a little table. I assume you already have the little tables working correctly with cell editors and so on, and you want to write a cell editor for the big table. Correct?
My problem with this is that I can't imagine how this would actually work in practice. Suppose I click on a cell in the big table; then the cell renderer displays the appropriate little table. At this point should I see one of the cells in that little table selected, and should I be able to use the Tab key to move around the little table? And if so, then I can't use the Tab key to move around the big table. Next, suppose I press F2 indicating that I want to edit the little table. What should change? Should I now be able to tab around the little table, whereas I couldn't before? And if so, how do I indicate that I have stopped editing the little table? Pressing Enter indicates to the little table's cell editor that its editing is finished, but how should I tell the big table's cell editor that its editing is finished?
Perhaps if you can answer this, you may have a better idea of how to solve your problem. Sorry I only have questions and not answers.

Cell editor use

what all the advantages using cell editor and where it is necessary to use

Hi,
Refer,
Re: cell editor
http://help.sap.com/saphelp_nw04/helpdata/en/cb/89fa3a0376a51fe10000000a114084/content.htm
http://help.sap.com/saphelp_nw04/helpdata/en/a5/359840dfa5a160e10000000a1550b0/content.htm
Regards,
Gunjan.

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
     }

JTable cell editor popup

Hi All
I created a CalendarPanel, which contains a combobox for months and a spinner for year and grid of JLabels to display dates.
And, a JTable with a cell which holds a date value. I created a cell editor with JSpinner to increment or decrement date by 1, which is practically not good. So I added a button top popup the calendar and user selects the date.
Cell editor is a JPanel with a spinner and a small JButton. The click event of this button shows a Calendar (another JPanel) in which we can select the date.
The spinner in the cell editor and the Calendar are linked to each other so that if user clicks on the spinner to change the date, that change reflects in the calendar also, and vice versa.
I am able to popup the calendar on top of JTable at appropriate location (exactly below the cell) and when user selects the date it changes the value of spinner and vice versa.
With this I have two problems.
1. When user clicks on some other area of the calendar (except spinner) the calendar should automatically disappear. Right now when user double clicks on the date it disappears.
2. In the calendar panel when I click on combo box to select the month or on the spinner to change the year - table cell is losing its focus and stopping the cell editing, means no link with calendar and the cell. But this is not happening with the label click (I guess this is because JLabels have no focus)
How can I solve these 2.
Thanks in advance.

1. When user clicks on some other area of the calendar
(except spinner) the calendar should automatically
disappear. Right now when user double clicks on the
date it disappears. Add a mouse listener to the other components that updates the calendar, the setVisible(false).
2. In the calendar panel when I click on combo box to
select the month or on the spinner to change the year
- table cell is losing its focus and stopping the cell
editing, means no link with calendar and the cell. But
this is not happening with the label click (I guess
this is because JLabels have no focus)
Have your cell editor extend DefaultCellEditor. In the constructor, set the editorComponent to your new calendar component. Add a mouse listener (adapter) to the editorComponent - in mouseClicked, call stopCellEditing().

Cell Editor and Structures

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