Editing a Tree Cell

Hi All,
I know that many questions crop up in this area; I will try to be brief.
My class extends JTextField and implements TreeCellEditor. I defined these methods:
1. addCellEditorListener
2. isCellEditable
3. getTreeCellEditorComponent
4. shouldSelectCell
5. getCellEditorValue
6. cancelCellEditing
7. stopCellEditing
8. removeCellEditorListener
Numbers 2,3,4 make sense to me. They seem to say "if the cell is editable, then get its editor component, and decide if the whole cell should be selected when placed into edit." These work as I expected.
But I also observe - and do not understand - this behavior:
1. click inside a cell to edit it
2. type something to change its content and hit the ENTER key
When I do this, nothing happens. That is, the text cursor remains positioned within the cell. I found this strange because before I defined my own cell editor, I am fairly certain that the default editor responded to the enter key by removing the cell from edit mode.
Stranger still is this: if, after editing a cell, I remove focus from it, e.g., I click on another cell, the first cell reverts to its former value. This is most frustrating. In this case, unlike the enter key case, I believe that getCellEditorValue is called. My understanding is that this method gets called when an edit is viewed as complete. Hence I return the current value of the cell. Some tracing shows that I am returning the proper value. Yet the cell reverts to its original, pre-edit value.
So I guess I have two questions:
1. what is "normative" in the "edit cycle", i.e., how is editing customarily terminated? Related to this is the disposition of the text cursor after edit. I prefer it not to remain in the edited field.
2. Why does losing focus after edit cause my edited field to revert to its pre-edit value?
As always, I am grateful for whatever light you can shed on these matters.
Cordially,
Paul

It is a good thing you are learning how to use the TreeCellEditor interface but if you are doing something more than just learning then I would advice you use the DefaultCellEditor class instead. also if you desire to implement your own TreeCellEditor then, take time to take a look at the source code for your DefaultCellEditor class you should see what you are doing wrong and what they did right. The source code is in "JDKdir/src.zip"
ICE

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Cheers,
D

I the forums 100s of times.Many thanks. If they had a decent search on this forum I might have found it as I did try.
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row, col = 0,0
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public void setValueAt(Object value, int row, int col) {
try {
((ITableCellAdapter)adapters.get(col)).setData(getRow(row),col);
System.out.println("row, col = " + row + col);
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Did you find the solution to yuor problem?
Has anyone seen this strange behavior? I try to edit
a Date Cell in JTable (orig. value 10/02/2000) and
change it to (10/03/2000), I press Enter. But, the
value of my Time Cell in the next column, same row
which I never edited (orig. value 00:05:00) changes to
approximately my system time in GMT (16:28:48).
This is an excerpt from my TableModel which get called
from setValueAt():1734 javax.swing.JTable,
JTable.java. In the code below, the debug statement
prints out:
row, col = 0,0
Value in SubTableModel = 10-02-2000 16:28:48
Value should be "10-02-2000" since I did not edit the
time cell at all. And why is row and col both zero?
public void setValueAt(Object value, int row, int
nt col) {
try {
((ITableCellAdapter)adapters.get(col)).setData(getRow(
ow),col);
System.out.println("row, col = " + row +
+ row + col);
System.out.println("Value in SubTableModel = "
del = " + value.toString());
((ITableCellAdapter)adapters.get(col)).setValue(value)
catch (PropertyVetoException badSet) {
System.out.println("could not set value");
fireTableCellUpdated(row,col);
How can I force it to set the date cell's new value
only and leave the time cell alone?
I've also seen that sometimes my date entry gets lost,
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I've seen a bunch of bug parade listings about
terminating edits within a JTable being buggy, is
this related?
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Hi All,
I am looking for an example of program with CL_GUI_ALV_TREE that have a functionality of add a tree node, edit a tree node, and delete a tree node.
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Any info on this.
Thanks
aRs

Hello aRs
Here is a sample report showing how to delete nodes in an ALV tree. The report was copied from BCALV_TREE_01. Search for added code:
*$ADDED: begin
*$ADDED: end[/code]
When you display the tree expand the first folder completely. When entering 'DELETE' into the command field directly the first flight date node will be deleted.
REPORT ZUS_SDN_BCALV_TREE_01_DELNODE.
based on: REPORT bcalv_tree_01.
Purpose:
~~~~~~~~
This report shows the essential steps to build up a hierarchy
using an ALV Tree Control (class CL_GUI_ALV_TREE).
Note that it is not possible to build up this hierarchy
using a simple ALV Tree Control (class CL_GUI_ALV_TREE_SIMPLE).
To check program behavior
~~~~~~~~~~~~~~~~~~~~~~~~~
Start this report. The hierarchy tree consists of nodes for each
month on top level (this level can not be build by a simple ALV Tree
because there is no field for months in our output table SFLIGHT.
Thus, you can not define this hierarchy by sorting).
Nor initial calculations neither a special layout has been applied
(the lines on the right do not show anything).
Note also that this example does not build up and change the
fieldcatalog of the output table. For this reason, all fields
of the output table are shown in the columns although the fields
CARRID and FLDATE are already placed in the tree on the left.
(Of course, this is not a good style. See BCALV_TREE_02 on how to
hide columns).
Essential steps (Search for '§')
~~~~~~~~~~~~~~~
1.Usual steps when using control technology.
   1a. Define reference variables.
   1b. Create ALV Tree Control and corresponding container.
2.Create Hierarchy-header
3.Create empty Tree Control
4.Create hierarchy (nodes and leaves)
   4a. Select data
   4b. Sort output table according to your conceived hierarchy
   4c. Add data to tree
5.Send data to frontend.
6.Call dispatch to process toolbar functions
*$ADDED: begin
DATA:
gd_del_nkey      TYPE lvc_nkey.
*$ADDED: end
§1a. Define reference variables
DATA: g_alv_tree         TYPE REF TO cl_gui_alv_tree,
      g_custom_container TYPE REF TO cl_gui_custom_container.
DATA: gt_sflight      TYPE sflight OCCURS 0,      "Output-Table
      ok_code LIKE sy-ucomm,
      save_ok LIKE sy-ucomm,           "OK-Code
      g_max TYPE i VALUE 255.
END-OF-SELECTION.
CALL SCREEN 100.
*&      Module PBO OUTPUT
      process before output
MODULE pbo OUTPUT.
SET PF-STATUS 'MAIN100'.
SET TITLEBAR 'MAINTITLE'.
IF g_alv_tree IS INITIAL.
    PERFORM init_tree.
    CALL METHOD cl_gui_cfw=>flush
      EXCEPTIONS
        cntl_system_error = 1
        cntl_error        = 2.
    IF sy-subrc NE 0.
      CALL FUNCTION 'POPUP_TO_INFORM'
        EXPORTING
          titel = 'Automation Queue failure'(801)
          txt1 = 'Internal error:'(802)
          txt2 = 'A method in the automation queue'(803)
          txt3 = 'caused a failure.'(804).
    ENDIF.
ENDIF.
ENDMODULE.                             " PBO OUTPUT
*&      Module PAI INPUT
      process after input
MODULE pai INPUT.
save_ok = ok_code.
CLEAR ok_code.
CASE save_ok.
    WHEN 'EXIT' OR 'BACK' OR 'CANC'.
      PERFORM exit_program.
*$ADDED: begin
    WHEN 'DELETE'.
      CALL METHOD g_alv_tree->delete_subtree
        EXPORTING
          i_node_key                = gd_del_nkey
         I_UPDATE_PARENTS_EXPANDER = SPACE
          i_update_parents_folder   = 'X'
        EXCEPTIONS
          node_key_not_in_model     = 1
          OTHERS                    = 2.
      IF sy-subrc <> 0.
      MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
                 WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
      ENDIF.
      CALL METHOD g_alv_tree->frontend_update.
*$ADDED: end
    WHEN OTHERS.
§6. Call dispatch to process toolbar functions
      CALL METHOD cl_gui_cfw=>dispatch.
ENDCASE.
CALL METHOD cl_gui_cfw=>flush.
ENDMODULE.                             " PAI INPUT
*&      Form init_tree
      text
--> p1        text
<-- p2        text
FORM init_tree.
§1b. Create ALV Tree Control and corresponding Container.
create container for alv-tree
DATA: l_tree_container_name(30) TYPE c.
l_tree_container_name = 'CCONTAINER1'.
CREATE OBJECT g_custom_container
     EXPORTING
           container_name = l_tree_container_name
     EXCEPTIONS
           cntl_error                  = 1
           cntl_system_error           = 2
           create_error                = 3
           lifetime_error              = 4
           lifetime_dynpro_dynpro_link = 5.
IF sy-subrc <> 0.
    MESSAGE x208(00) WITH 'ERROR'(100).
ENDIF.
create tree control
CREATE OBJECT g_alv_tree
    EXPORTING
        parent              = g_custom_container
        node_selection_mode = cl_gui_column_tree=>node_sel_mode_single
        item_selection      = 'X'
        no_html_header      = 'X'
        no_toolbar          = ''
    EXCEPTIONS
        cntl_error                   = 1
        cntl_system_error            = 2
        create_error                 = 3
        lifetime_error               = 4
        illegal_node_selection_mode = 5
        failed                       = 6
        illegal_column_name          = 7.
IF sy-subrc <> 0.
    MESSAGE x208(00) WITH 'ERROR'.                          "#EC NOTEXT
ENDIF.
§2. Create Hierarchy-header
The simple ALV Tree uses the text of the fields which were used
for sorting to define this header. When you use
the 'normal' ALV Tree the hierarchy is build up freely
by the programmer this is not possible, so he has to define it
himself.
DATA l_hierarchy_header TYPE treev_hhdr.
PERFORM build_hierarchy_header CHANGING l_hierarchy_header.
§3. Create empty Tree Control
IMPORTANT: Table 'gt_sflight' must be empty. Do not change this table
(even after this method call). You can change data of your table
by calling methods of CL_GUI_ALV_TREE.
Furthermore, the output table 'gt_outtab' must be global and can
only be used for one ALV Tree Control.
CALL METHOD g_alv_tree->set_table_for_first_display
    EXPORTING
      i_structure_name    = 'SFLIGHT'
      is_hierarchy_header = l_hierarchy_header
    CHANGING
      it_outtab           = gt_sflight. "table must be empty !
§4. Create hierarchy (nodes and leaves)
PERFORM create_hierarchy.
§5. Send data to frontend.
CALL METHOD g_alv_tree->frontend_update.
wait for automatic flush at end of pbo
ENDFORM.                               " init_tree
*&      Form build_hierarchy_header
      build hierarchy-header-information
     -->P_L_HIERARCHY_HEADER strucxture for hierarchy-header
FORM build_hierarchy_header CHANGING
                               p_hierarchy_header TYPE treev_hhdr.
p_hierarchy_header-heading = 'Month/Carrier/Date'(300).
p_hierarchy_header-tooltip = 'Flights in a month'(400).
p_hierarchy_header-width = 30.
p_hierarchy_header-width_pix = ' '.
ENDFORM.                               " build_hierarchy_header
*&      Form exit_program
      free object and leave program
FORM exit_program.
CALL METHOD g_custom_container->free.
LEAVE PROGRAM.
ENDFORM.                               " exit_program
*&      Form create_hierarchy
      text
--> p1        text
<-- p2        text
FORM create_hierarchy.
DATA: ls_sflight TYPE sflight,
        lt_sflight TYPE sflight OCCURS 0,
        l_yyyymm(6) TYPE c,            "year and month of sflight-fldate
        l_yyyymm_last(6) TYPE c,
        l_carrid LIKE sflight-carrid,
        l_carrid_last LIKE sflight-carrid.
DATA: l_month_key TYPE lvc_nkey,
        l_carrid_key TYPE lvc_nkey,
        l_last_key TYPE lvc_nkey.
§4a. Select data
SELECT * FROM sflight INTO TABLE lt_sflight UP TO g_max ROWS.
§4b. Sort output table according to your conceived hierarchy
We sort in this order:
   year and month (top level nodes, yyyymm of DATS)
     carrier id (next level)
        day of month (leaves, dd of DATS)
SORT lt_sflight BY fldate0(6) carrid fldate6(2).
Note: The top level nodes do not correspond to a field of the
output table. Instead we use data of the table to invent another
hierarchy level above the levels that can be build by sorting.
§4c. Add data to tree
LOOP AT lt_sflight INTO ls_sflight.
Prerequesite: The table is sorted.
You add a node everytime the values of a sorted field changes.
Finally, the complete line is added as a leaf below the last
node.
    l_yyyymm = ls_sflight-fldate+0(6).
    l_carrid = ls_sflight-carrid.
Top level nodes:
    IF l_yyyymm <> l_yyyymm_last.      "on change of l_yyyymm
      l_yyyymm_last = l_yyyymm.
*Providing no key means that the node is added on top level:
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                             CHANGING l_month_key.
The month changed, thus, there is no predecessor carrier
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    ENDIF.
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(always inserted as child of the last month
which is identified by 'l_month_key')
    IF l_carrid <> l_carrid_last.      "on change of l_carrid
      l_carrid_last = l_carrid.
      PERFORM add_carrid_line USING    ls_sflight
                                       l_month_key
                              CHANGING l_carrid_key.
    ENDIF.
Leaf:
(always inserted as child of the last carrier
which is identified by 'l_carrid_key')
    PERFORM add_complete_line USING ls_sflight
                                     l_carrid_key
                            CHANGING l_last_key.
ENDLOOP.
ENDFORM.                               " create_hierarchy
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FORM add_month USING     p_yyyymm TYPE c
                          p_relat_key TYPE lvc_nkey
                CHANGING p_node_key TYPE lvc_nkey.
DATA: l_node_text TYPE lvc_value,
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        l_month(15) TYPE c.            "output string for month
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ALV Tree firstly inserts this node as a leaf if you do not provide
IS_NODE_LAYOUT with field ISFOLDER set. In form 'add_carrid_line'
the leaf gets a child and thus ALV converts it to a folder
automatically.
CALL METHOD g_alv_tree->add_node
    EXPORTING
      i_relat_node_key = p_relat_key
      i_relationship   = cl_gui_column_tree=>relat_last_child
      i_node_text      = l_node_text
      is_outtab_line   = ls_sflight
    IMPORTING
      e_new_node_key   = p_node_key.
ENDFORM.                               " add_month
FORM add_carrid_line USING     ps_sflight TYPE sflight
                               p_relat_key TYPE lvc_nkey
                     CHANGING p_node_key TYPE lvc_nkey.
DATA: l_node_text TYPE lvc_value,
        ls_sflight TYPE sflight.
add node
ALV Tree firstly inserts this node as a leaf if you do not provide
IS_NODE_LAYOUT with field ISFOLDER set. In form 'add_carrid_line'
the leaf gets a child and thus ALV converts it to a folder
automatically.
l_node_text = ps_sflight-carrid.
CALL METHOD g_alv_tree->add_node
    EXPORTING
      i_relat_node_key = p_relat_key
      i_relationship   = cl_gui_column_tree=>relat_last_child
      i_node_text      = l_node_text
      is_outtab_line   = ls_sflight
    IMPORTING
      e_new_node_key   = p_node_key.
ENDFORM.                               " add_carrid_line
*&      Form add_complete_line
FORM add_complete_line USING   ps_sflight TYPE sflight
                               p_relat_key TYPE lvc_nkey
                     CHANGING p_node_key TYPE lvc_nkey.
DATA: l_node_text TYPE lvc_value.
WRITE ps_sflight-fldate TO l_node_text MM/DD/YYYY.
add leaf:
ALV Tree firstly inserts this node as a leaf if you do not provide
IS_NODE_LAYOUT with field ISFOLDER set.
Since these nodes will never get children they stay leaves
(as intended).
CALL METHOD g_alv_tree->add_node
    EXPORTING
      i_relat_node_key = p_relat_key
      i_relationship   = cl_gui_column_tree=>relat_last_child
      is_outtab_line   = ps_sflight
      i_node_text      = l_node_text
    IMPORTING
      e_new_node_key   = p_node_key.
*$ADDED: begin
IF ( ps_sflight-fldate = '20040522' ). " first flight date
    IF ( gd_del_nkey IS INITIAL ). " collect only first date
      gd_del_nkey = p_node_key.
    ENDIF.
ENDIF.
*$ADDED: end
ENDFORM.                               " add_complete_line
*&      Form GET_MONTH
      text
     -->P_P_YYYYMM text
     <--P_L_MONTH text
FORM get_month USING    p_yyyymm
               CHANGING p_month.
Returns the name of month according to the digits in p_yyyymm
DATA: l_monthdigits(2) TYPE c.
l_monthdigits = p_yyyymm+4(2).
CASE l_monthdigits.
    WHEN '01'.
      p_month = 'January'(701).
    WHEN '02'.
      p_month = 'February'(702).
    WHEN '03'.
      p_month = 'March'(703).
    WHEN '04'.
      p_month = 'April'(704).
    WHEN '05'.
      p_month = 'May'(705).
    WHEN '06'.
      p_month = 'June'(706).
    WHEN '07'.
      p_month = 'July'(707).
    WHEN '08'.
      p_month = 'August'(708).
    WHEN '09'.
      p_month = 'September'(709).
    WHEN '10'.
      p_month = 'October'(710).
    WHEN '11'.
      p_month = 'November'(711).
    WHEN '12'.
      p_month = 'December'(712).
ENDCASE.
CONCATENATE p_yyyymm+0(4) '->' p_month INTO p_month.
ENDFORM.                               " GET_MONTH
/code
Regards
Uwe

Tree cell disapearing

Hi
I'm using Java 1.5.0.11
I'm trying to make my own tree cell renderer and editor : the goal is to add to the standard tree cell (icon + uneditable text) an icon to the left, to indicate a certain "state". The state can be change by clicking on it, showxing a JPopupMenu to select a new one.
In my proto, it works well, except that when I change one row, it is redrawn completely blank. I need to click on it again to have it appear.
Any idea on why?
Best regards

TreeSelector. java
package treeselectproto;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.swing.AbstractAction;
import javax.swing.AbstractCellEditor;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.ScrollPaneConstants;
import javax.swing.tree.TreeCellEditor;
import javax.swing.tree.TreeCellRenderer;
import javax.swing.tree.TreePath;
public class TreeSelector {
     protected JTree itsTree;
     protected JScrollPane itsScrollPane;
     protected Map<Object, State> itsStates=new HashMap<Object, State>();
     protected CellRenderer itsRenderer;
     protected JPopupMenu itsPopupMenu = new JPopupMenu();
     public TreeSelector()
          itsTree=new JTree();
          itsRenderer=new CellRenderer();
          itsTree.setCellRenderer(itsRenderer);
          itsTree.setCellEditor(itsRenderer);
          itsTree.setEditable(true);
          buildScrollPane();
          List<State> theStates=State.getPopupStates();
          for(State s:theStates)
               PopupAction a=new PopupAction(s);
               JMenuItem mi=new JMenuItem(a);
               itsPopupMenu.add(mi);
     private void buildScrollPane() {
          itsScrollPane= new JScrollPane(itsTree,
                    ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS,
                    ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
     public JScrollPane getScrollPane() {
          return itsScrollPane;
     @SuppressWarnings("serial")
     private class CellRenderer extends AbstractCellEditor implements TreeCellRenderer, TreeCellEditor
          private JPanel itsPanel;
          private JLabel itsLabel;
          private JButton itsStateBtn;
          private BorderLayout itsLayout;
          public CellRenderer()
               itsPanel=new JPanel();
               itsPanel.setLayout(itsLayout=new BorderLayout());
               itsPanel.setDoubleBuffered(false);
               itsLayout.setVgap(1);
               itsLayout.setHgap(1);
               itsLabel=new JLabel();
               itsLabel.setDoubleBuffered(false);
               itsPanel.add(itsLabel,BorderLayout.CENTER);
               itsStateBtn=new JButton(new AbstractAction(){
                    public void actionPerformed(ActionEvent aE) {
                         showPopup();
               itsStateBtn.setBorderPainted(true);
               itsStateBtn.setContentAreaFilled(false);
               itsStateBtn.setDoubleBuffered(false);
               itsPanel.add(itsStateBtn,BorderLayout.WEST);
          protected void showPopup() {
               itsPopupMenu.show(itsStateBtn, 0, 0);
          public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus)
               TreePath thePath=tree.getPathForRow(row);
               itsPanel.setBackground(tree.getBackground());
               if(thePath != null)
                    State theState=getStateForTreePath(thePath);
                    String ic=theState.getSign();
                    itsStateBtn.setText(ic);
               itsLabel.setText(value.toString());
               itsStateBtn.setPreferredSize(null);
               itsLabel.setPreferredSize(null);
               itsPanel.setBackground( selected? Color.lightGray:tree.getBackground());
               itsLayout.invalidateLayout(itsPanel);
               return itsPanel;
          private Object itsValue;
          public Component getTreeCellEditorComponent(JTree aTree, Object aValue, boolean aIsSelected, boolean aExpanded, boolean aLeaf, int aRow) {
               // if edting, it has the focus
               itsValue=aValue;
               return getTreeCellRendererComponent(aTree,aValue,aIsSelected,aExpanded,aLeaf,aRow,true);
          public Object getCellEditorValue() {
               return itsValue;
     public State getStateForTreePath(TreePath thePath) {
          State ret=itsStates.get(thePath.getLastPathComponent());
          if(ret==null)
               ret=State.defaultState();
          return ret;
     @SuppressWarnings("serial")
     private class PopupAction extends AbstractAction
          protected State itsState;
          public PopupAction(State aState) {
               super(aState.getLabel());
               itsState = aState;
          public void actionPerformed(ActionEvent aE) {
               TreePath thePath=itsTree.getEditingPath();
               Object theObj=thePath.getLastPathComponent();
               itsStates.put(theObj, itsState);
}

Full ALV column getting editable not just cell!

Need desparate help please...
A very strange thing is happening. I have DATA_ITAB for ALV display. The ITAB has 2 extra fields one for STYLE one for COLOR as follows:-
TYPES : cellstyles TYPE lvc_t_styl ,
*for editing cells
For cell coloring
cellcolor TYPE lvc_t_scol.
The correct cells are being coloured based on the logic. The issue is with the editable cells. The whole column is being made editable including the cell. I have checked in debugger all rows of the ITAB_DATA have correct fields in the cellstyles tab with fields sorted to reflect which fields should be edidable for each index. Still the whole column is being made editable.
I am NOT using edit flag for the field catalogue so that is not a problem......I have included the cellstyles field in the layout of the grid....
Can anyone help with this issue......thnx

Thank you guys for your silence That prompted me to continue to look at my code and finally noticed I had marked the column editable in fieldcat
Once i switched that of and then called the following it worked like a GEM:-
CALL METHOD p_ob_grid->set_ready_for_input
EXPORTING
i_ready_for_input = 1.
<< Please do not offer points >>
Edited by: Rob Burbank on Oct 8, 2010 2:11 PM

TextFormatter in list, table and tree cells

Release 8u40 introduces the TextFormatter concept in the text input field area. It is currently a new property of the TextInputControl class.
This is defintely a more elegant way to deal with validation than overriding "replaceText(...)".
Shouldn't this property also be available in list, table and tree cells ?
Are there plans to do this (before we make our own implementation) ?

I've got exactly the same problem, +1.
This shouldn't be to difficult to solve for 8u60 and definitely useful,
giving access to the text input control in mutable cells could be a one-line workaround !
Additionally, could a TextFormatter be made shareable between table/list rows
by NOT using the value/valueConverter properties, but only the filter part in cases
where the final desired output type is String ?

Tree Cell Editorer

I have a problem with editing a cell in a tree
I implemented the TreeCellEditorer
public Component getTreeCellEditorComponent(JTree arg0, Object value, ...){
    DefaultMutableTreeNode node = (DefaultMutableTreeNode) value;
    Object userObject = node.getUserObject();
    if (userObject instanceof OverLay)
        return ((OverLay) userObject).getComponent(); // return a JPanel
    return new JLabel(userObject.toString()); // return the String
public boolean isCellEditable(EventObject arg0) {
     return true;
}I also set the tree editable property to true
tree.setEditable(true);
basiaclly, the line of code:
return ((OverLay) userObject).getComponent(); // return a JPanelreturns a JPanel, and this panel contains 3 JCheckBox, and JLabels
i cannot check or uncheck the JCheckBox. How can i fix this?

my fault.
I had the setEditable(false) on the JCheckBox.

Editing a Tree Cell

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