JTable custom column renderers

Hi,
I am using a custom column renderer to format a date value in the table, and am passing back a checkbox. However, i am unable get the jTextField to look/act like the default rendered componenets, ie. if i select them they have the same uneditable colour. How can i get the same behaviour.
Thanks
Rudy

Hi,
I think this could be a possible bug in Java, because when i changed my LookAndFeel to the default (metal) the entire table row appeared selected when it was selected. Each of the textFields rendered correctly. However, when i change it to my system look and feel (windows) the jTables rows to not render correctly and the textfield columns of the selected row appear to have a white background, and a white foreground. Which means the text which is originally black disappears??
Any suggestions greatly welcomed.
Rudy

Similar Messages

Making some Custom Column Renderers for a JTable

Hello People
I've been playing around with a JTable by following the tutorial "How to Use Tables". (I am using netBeans 4.1 to "sculpt" my swing objects onto the nice palette in the IDE. I don't know if this has anything to do with the errors but, it seems like netBeans requires some Gui components be initialized via this abovementioned "palette")
I believe that I need to somehow tell the JTable about what kinds of objects are in it so that it can render itself properly. I have a table set up with some default values in it
->Strings both Editable and Not-Editable
-> Integers both Editable and Not-Editable
-> Boolean rendered as a check box Editable
So upon startup, my progarm renders the table correctly. I have a button to clear all of the elements in the table, which works fine. It is only when I switch to another window, then switch back to an empty table ... the JTable needs to redraw itself. This is when I'm getting the error:
java.lang.NullPointerException
        at ElementHelp.PrimitiveManager$MyVectorTableModel.getColumnClass(PrimitiveManager.java:93)
        at javax.swing.JTable.getColumnClass(JTable.java:1752)
        at javax.swing.JTable.getCellRenderer(JTable.java:3700)
        at javax.swing.plaf.basic.BasicTableUI.paintCell(BasicTableUI.java:1148)
        at javax.swing.plaf.basic.BasicTableUI.paintCells(BasicTableUI.java:1051)
        at javax.swing.plaf.basic.BasicTableUI.paint(BasicTableUI.java:974)
        at javax.swing.plaf.ComponentUI.update(ComponentUI.java:142)
        at javax.swing.JComponent.paintComponent(JComponent.java:541)
        at javax.swing.JComponent.paint(JComponent.java:808)
...blah blah more exception stack.....
       I think that because there are no elements in the table that the call to "getClass" for an element in the table returns a NullPointerException. I think I can avoid this via telling the JTable about the types of objects each column will contain. The tutorial suggests one of two solutions: (neither of which I can get to work)
1) Use a class that extends the DefaultTableCellRenderer
2) I should write somthing that ...extends JLabel and implements TableCellRenderer.... such as the tutorials ColorRenderer example. Which solution should I work out if I want my table to add/delete rows and be able to have a few cells edited. (It will never be restructured .. the column types won't change)
Also, I've created my own TableModel for it ... a class that extends AbstractTableModel ... (although not declaired, it also implemnts/overwrites functions from the TableModel interface)
Any suggestions on avoiding the abovementioned error?
thanks and happy holidays to everyone

I think that because there are no elements in the table that the call to "getClass" for an element in the table returns a NullPointerExceptionWell, if you have no data in the table then your TableModel should be returning "0" for the number of rows in the table and it won't be a problem.
Also, I've created my own TableModel for it ... Why? Use the DefaultTableModel it supports String, Integers and Booleans without any need for custom coding.

Problems with JTable custom cell renderers

Hi All,
I'm having a bit of a problem writing a custom renderer for a JTable.
What seems to be happening is that the changes I apply in the renderer to the component are applied to ALL cells.
All I want to do is have a different background color for certain cells....
Ive derived from DefaultTableCellRenderer, so Im using its getTableCellRendererComponent to do most of the work.
So, Ive got something like this:
private class DirtyCacheRenderer extends DefaultTableCellRenderer
    public Component getTableCellRendererComponent(JTable table, Object value,
                          boolean isSelected, boolean hasFocus, int row, int column)
      // Modifies 'this'
      super.getTableCellRendererComponent(table,value,isSelected,hasFocus,row,column);
      // If the row/column is 'dirty' (I.e - if I want 2 color it diferently)
      if(((EditableTableModel)table.getModel()).isDirty(row,column))
        // The column is dirty. Set the color accordingly:
        super.setBackground(DIRTY_COLOR);
      return this;
}The effect is that as soon as ONE cell gets its color set above, all of the cells do!
Please help, its driving me mad!!!
D

I tried this and it worked. Tell me if it is OK for you.
import javax.swing.table.TableCellRenderer;
import java.awt.Color;
import java.awt.Component;
import javax.swing.JTable;
import javax.swing.JLabel;
public class testRenderer implements TableCellRenderer {
JLabel cell = new JLabel();
Color dirty = new Color(100,100,100);
Color clear = new Color(0,0,0);
public testRenderer() {
cell.setOpaque(true);
public Component getTableCellRendererComponent(JTable table,Object value,
boolean isSelected,boolean hasFocus, int row, int column) {
cell.setText(value.toString());
// The column is dirty. Set the color
if (row == column)     {
cell.setBackground(dirty);
} else {
cell.setBackground(table.getBackground());
return cell;
}

JTable with custom column model and table model not showing table header

Hello,
I am creating a JTable with a custom table model and a custom column model. However the table header is not being displayed (yes, it is in a JScrollPane). I've shrunk the problem down into a single compileable example:
Thanks for your help.
import javax.swing.*;
import javax.swing.table.*;
public class Test1 extends JFrame
     public static void main(String args[])
          JTable table;
          TableColumnModel colModel=createTestColumnModel();
          TestTableModel tableModel=new TestTableModel();
          Test1 frame=new Test1();
          table=new JTable(tableModel, colModel);
          frame.getContentPane().add(new JScrollPane(table));
          frame.setSize(200,200);
          frame.setVisible(true);
     private static DefaultTableColumnModel createTestColumnModel()
          DefaultTableColumnModel columnModel=new DefaultTableColumnModel();
          columnModel.addColumn(new TableColumn(0));
          return columnModel;
     static class TestTableModel extends AbstractTableModel
          public int getColumnCount()
               return 1;
          public Class<?> getColumnClass(int columnIndex)
               return String.class;
          public String getColumnName(int column)
               return "col";
          public int getRowCount()
               return 1;
          public Object getValueAt(int row, int col)
               return "test";
          public void setValueAt(Object aValue, int rowIndex, int columnIndex)
}Edited by: 802416 on 14-Oct-2010 04:29
added

Kleopatra wrote:
jduprez wrote:
See http://download.oracle.com/javase/6/docs/api/javax/swing/table/TableColumn.html#setHeaderValue(java.lang.Object)
When the TableColumn is created, the default headerValue is null
So, the header ends up rendered as an empty label (probably of size 0 if the JTable computes its header size based on the renderer's preferred size).nitpicking (can't resist - the alternative is a cleanup round in some not so nice code I produced recently <g>):
- it's not the JTable's business to compute its headers size (and it doesn't, the header's the culprit.) *> - the header should never come up with a zero (or near-to) height: even if there is no title shown, it's still needed as grab to resize/move the columns. So I would consider this sizing behaviour a bug.*
- furthermore, the "really zero" height is a longstanding issue with MetalBorder.TableHeaderBorder (other LAFs size with the top/bottom of their default header cell border) which extends AbstractBorder incorrectly. That's easy to do because AbstractBorder itself is badly implemented
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6459419
Thanks for the opportunity to have some fun :-)
JeanetteNo problem, thanks for the insight :)

Can't set custom column widths in JTable

I'm trying to set custom columns widths. They are set as I wish but then they are reset to default values (all columns have the same size). This is caused by method JFrame.setVisible(true) which invokes JTree.setWidthsFromPreferredWidths(). It can be investigated from following stack trace printed when a column being resized (see below).
How to prevent this auto width sizing?
P.S. can't override JTable.setWidthsFromPreferredWidths(); seems it's private
table = new JTable(model) {
     public void columnMarginChanged(ChangeEvent event) {
          new Exception("stack trace").printStackTrace();
          super.columnMarginChanged(event);
// setting here custom columns widths via table column model ...java.lang.Exception: stack trace
     at mtu.gui.TrackList$1.columnMarginChanged(TrackList.java:30)
     at javax.swing.table.DefaultTableColumnModel.fireColumnMarginChanged(DefaultTableColumnModel.java:615)
     at javax.swing.table.DefaultTableColumnModel.propertyChange(DefaultTableColumnModel.java:679)
     at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange(SwingPropertyChangeSupport.java:264)
     at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange(SwingPropertyChangeSupport.java:232)
     at javax.swing.table.TableColumn.firePropertyChange(TableColumn.java:249)
     at javax.swing.table.TableColumn.firePropertyChange(TableColumn.java:255)
     at javax.swing.table.TableColumn.setWidth(TableColumn.java:482)
     at javax.swing.JTable$2.setSizeAt(JTable.java:2242)
     at javax.swing.JTable$5.setSizeAt(JTable.java:2336)
     at javax.swing.JTable.adjustSizes(JTable.java:2372)
     at javax.swing.JTable.adjustSizes(JTable.java:2340)
     at javax.swing.JTable.setWidthsFromPreferredWidths(JTable.java:2250) <======
     at javax.swing.JTable.doLayout(JTable.java:2165)
     at java.awt.Container.validateTree(Container.java:1089)
     at java.awt.Container.validateTree(Container.java:1096)
     at java.awt.Container.validateTree(Container.java:1096)
     at java.awt.Container.validateTree(Container.java:1096)
     at java.awt.Container.validateTree(Container.java:1096)
     at java.awt.Container.validateTree(Container.java:1096)
     at java.awt.Container.validateTree(Container.java:1096)
     at java.awt.Container.validateTree(Container.java:1096)
     at java.awt.Container.validateTree(Container.java:1096)
     at java.awt.Container.validateTree(Container.java:1096)
     at java.awt.Container.validateTree(Container.java:1096)
     at java.awt.Container.validateTree(Container.java:1096)
     at java.awt.Container.validate(Container.java:1064)
     at java.awt.Window.show(Window.java:455)
     at java.awt.Component.show(Component.java:1134)
     at java.awt.Component.setVisible(Component.java:1089) <=====
     at mtu.gui.Test.test_03(Test.java:56)
     at mtu.gui.Test.main(Test.java:29)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at com.intellij.rt.execution.application.AppMain.main(Unknown Source)

When I create the table I have code like this:TableColumn col = getColumnModel().getColumn(2);
col.setMinWidth(width + 4);
col.setMaxWidth((int)(width * 1.2));Works just fine for me. The setWidthsFromPreferredWidths() method will use these limits as far as I can see.
PC²

Restrict all the text in a datagrid input without having to create custom item renderers

Is there a way to restrict all the text in a datagrid input
without having to create custom item renderers for each
column?

How are you trying to restrict it? If you're trying to
restrict it uniformly, for example, to entirely numerical inputs,
then the easiest way I know of to do so is with an itemEditor. You
can just add the same itemEditor to each column that way.
This only saves work over custom renderers if you're trying
to restrict multiple columns in the same manner, but for numeric
only tables, it's pretty short.
You could probably also do it with itemEdit and
itemEditBeginning events, but that would likely be more work then
simply declaring a single global itemEditor and using it in all
your columns.

JTable Custom Cell Editor: how to get value?

I have some custom cell renderers and editor. One of my custom cell editor is a text field that can popup a separat gui for easier data selection. As this text field alone with the popup gui works great, when i use this field in my custom jtable cell editor, the gui selected value is never displayed in the table cell. it just shows the old value.?

Well, here's how I do it. I'm very new to Swing so I'm, not sure if this is the best way. If you find a better way, please repost on this message.
My cell editor is a JPanel with a JTextfield in it. I make sure that the JTextfield will have default focus when the JPanel is focused.
In the CellEditor, I add a KeyListener to the JTextField so that when the user hits enter, it fires the stopEditing. I then add a function to CellEditor that returns what's in the JTextField.
In the code, m_value is the JTextField. You want to add MyKeyAdapter to the JTextField. Viola, it works!
      * This private class reads in an enter key.
     class MyKeyAdapter extends KeyAdapter {
          public void keyPressed(KeyEvent e) {
               if (e.getKeyCode() == KeyEvent.VK_ENTER) {
                    stopCellEditing();
      * Returns the value of the editor
      * @return the value of the editor
     public String getValue() {
          return m_value.getText();

JTable: Custom cell renderer on T(row, col)

Sorry if this was posted before, but the whole Search function doesn't seem to work these days (hasn't been working for a week now). Anyways:
I know how to create custom cell renderers. My problem lies with which cells I want to apply that cell renderer to. It seems I am limited in setting a cell renderer to a whole column, which I don't want.
For instance, I'd like to apply cell renderer R1 to (0,0) but not to (1,0) and not to (3,0). Instead I want cell renderer R2 on (2,0) and (3,0).
Example of my table:
|--icon--|--filename--|--extension--|
|   R1   | file1.txt |     txt     |
|   R2   | img1.jpg |     jpg     |
|   R1   | file2.txt |     txt     |
|   R2   | img2.jpg |     jpg     |
|-----------------------------------|Is there any possibility this can be achieved? I am probably overlooking some method or class, but I don't know which. Some pointers or clues in the right directions are appreciated.
Thanks

Camickr, again you've been a great help. Works great, but a NullPointerException is being thrown and I can't find out what points to a null object.
Code is this:
    public TableCellRenderer getCellRenderer(int row, int column) {
        if (getValueAt(row, 3).equals("jpg") && column == 0) {
            return new IconCellRenderer(Klue.iconAdd);
        } else {
            return super.getCellRenderer(row, column);
    }Solution is catching the NullPointerException in this method, but I'd rather have an if statement checking for it. But what to check? Any ideas?

JTable loses cell renderers

Well I just had an annoying bug that took me a long time to diagnose.
Under certain circumstances, my JTable would suddenly redraw using all default cell renderers - my overriding renderers just stopped being used.
Until today I was not able to reproduce it consistently, but I finally managed to do so, and I found the reason for it.
It turned out that due to a bug in my code, I was occasionally callingfireTableRowsDeleted(first, last);with first set to -1. This apparently causes any column renderers you've set to be discarded!
Hopefully this post will be useful if anyone else sees the same loss of renderers.

It turned out that due to a bug in my code, I was occasionally calling
fireTableRowsDeleted(first, last);Doesn't seem right. Here is the code from the JTable. A negative value seems to be handled.
private void tableRowsDeleted(TableModelEvent e)
    int start = e.getFirstRow();
    int end = e.getLastRow();
    if (start < 0)
         start = 0;
    if (end < 0)
        end = getRowCount()-1;
...This problem is usually caused by invoking the fireTableStructureChanged() method (which is automatically invoked when you use setModel() or setDataVector()). This method does indeed cause the TableColumnModel to be recreated, which means the TableColumns are also recreated so you lose the old renderers and editors.
You can prevent this by using the following:
table.setAutoCreateColumnsFromModel( false );

Implementing BADI MD_ADD_COL_EZPS for MD04 custom column

Hi there,
I'm using BADI MD_ADD_COL_EZPS to display 3 new buttons and three new columns in MD04.
For each line item that is displayed, the custom column is filled, after the button is hit -This works fine.
My Question is:
Is there any way to limit the value that is filled into the new column so that it only appears on the FIRST line item/row?
(At the moment it is repeated all the way down the page - the new value is a material characteristic, so doesn't change, will always be the same for each line)
I've looked at all the available structures/tables in the FILL_ADD_COLUMNS method of the BADI, and none seem suitable
to determine the "first" row. (ie. something like the way SY-TABIX or SY-INDEX might be used)
Any help appreciated.
Thanks,
David.

Hi Shubhendu,
in the method 'ACTIVATE_ADD_COLUMNS', you can set the flag EZ1_MODE to '1' to make the first column visible always. (it's been a while, but I think setting it to '2' makes it visible when the button is pressed.)
Same applies to EZ2_MODE for second column, EZ3_MODE for third.
look at the flags/parameters in this method, and also in FILL_ADD_COLUMNS, to fill the data.
here you need to fill structure EMDEZX_USEX1 (for column 1) etc.
The code is hit for each record displayed in MD04
Hopefully this helps you.
Regards,
David

LOV of column names with a report's custom column headings?

I have a list ov values definition that looks like this:
select column_name d, column_name r from all_tab_columns where table_name = 'DATABASE_LIST'
I'd like to list the custom column headings from a report as d, rather than repeating the column_name. How can I do this?

As Anton said, the best thing is to store your custom headings in a table so that you can use the table for your LOV as well as for your report headings.
To use dynamic report headings, you can use the 'PL/SQL function body returning colon-delimited headings' feature on the Report Attributes page.
So, if your report headings are stored in table t that function body can be
declare
l_headings varchar2(4000)
begin
for rec in (select heading from t) loop
l_headings := l_headings||':'||rec.heading;
end loop;
return ltrim(l_heading,':');
end;Hope this helps.

F-53 and F-28, Customized columns for cash discount and %

Hi Expert,
With reference to the subject of: Customized columns for cash discount and % ...
I faced the problem of not able to set / defined hidden column for cash discount and % by creating a new variant.
Steps:
Create a variant
Click <administrator> button ... mark the columns hidden, and click <activate> button
Then click <Save> button
Problem: Every time I using the F-53/F-28, the layout is not working, and when goto check the variant settings, the cash discount and % columns remained unchecked.
SAP version: 4.6
Kindly advise.
Thanks and regards,
sbmel

Hi JP,
It is not working using field status group, as I am using F-53 and F-28 and not FB50/60/70.
The purpose I want to create variant for screen after clicking <process open item> is to control column display (hide cash discount and %). if the variant is working, I can create a customized Tcode for the F-53 and F-28.
Now problem is that variant seem not working.
Thanks and regards,
sbmel

Is there an easy view of assigned Retention Tags in main view of Messages, e.g. a custom column?

Hi,
I have a requiement to have an easy/overall view of assigned Retention Policy tags against a list of messages in outlook 2010.
I envisage that if there was a column in the main message list view, that showed the assigned tag against each message and that could be sorted, e.g. so I can see what has an assigned tag (and what it is) and what doesn't, this would hit the mark perfectly.
Any such capability?
Can I create a custom column that extracts a message property to do this?
If so, how?
Thanks! David.

Hi Greg,
Sorry it's been a couple of days, it's been busy.
Unfortunately not. I raised it with our devs to take a look at. I was initially after an assessment of effort. But they were quoting me a number of days effort just to get to the point of being able to tell me how long it would take. At that point I
pulled it, as it wasn't a must-have requirement.
Still, it would have been nice.
To extract such a property, I might imagine an Outlook plug-in to extract the data from the property and watchers to look out for changes in various circumstances. In this way if you can get the data into a new Custom Message Property, a Column
will readily display it. It feels a little over-engineered and duplicates the data just to get it into a place to show it.
Maybe there are easier ways. But no, I didn't make progress.
All the best. Ta, /David.

Custom column added is not available for Calendar list view in SharePoint 2010

I created a custome column "Breakline" in a custom content type 'SM event", and applied the content type to a Calendar.
The column is listed under the content type "SM event" but it is not listed when I tried to modify the view using the "Breakline" column.
Does anyone know why?

I set "Breakline" hidden because I don't want to show this in create new item form.
I realized that may be the reason. So changed the column to Optional in CT and created a new calendar using that CT. then at list level CT I changed it to Hidden. That works. The column is available for use when modifying view.
Thanks

Custom column in a list view web part for a multilingual site does not take on custom language labels. Stays in default language.

Hello all,
I have what so far appears to be a fairly unique problem. We are running a multilingual SharePoint 2010 environment with English as the default language and French as the secondary. We have setup the sites in a variance relationship, but the
issue I am discussing happens outside of a variant as well.
We have created a library outside the variant (but within the collection) that the two sites must share. A list view web part was created via Designer to add to each site to provide a quick view into the list. If we are in the libary and switch
to French, then update the column label it will remember the setting (because of the resource file) and maintain it as the language is flipped back and forth. Where it doesn't work is as a web part in a variant or where the language is different.
If the language is different, the out of the box columns work find, but the custom columns (all site columns not library\list columns) remain as the english label. It doesn't matter if within a variant or outside with the browser language changed.
It always reverts back to English. It's like it isn't using the same resource file that was used in the list itself.
I created a custom view and modified it with xslt as per
http://sharepoint.stackexchange.com/questions/50004/how-to-change-column-title-for-a-view-but-not-modify-the-list but this only worked within the list and did not occur in the list view either.
I can't be the first that has come across it, either I am not performing my searches properly, no one has ever documented a fix for this or this is something we just can't fix with OOTB tools. That's the other thing, the solution has to be accomplised
OOTB or with minor client side changes. I can't fire up Visual Studio because they are piloting Office 365 and have put a "No custom code" mandate on for migration.
Thank you all in advance.

Ok, I have come up with a solution. I edited the XSLT for the web part on the page. I did the following:
1.   Create the variants in the Site Ccollection
2.   Create the library outside of the variants.
3.   Add all the columns you require for the library. It is very important all the columns are there before you move on.
4.   Create a French and English view.
5.   Create the list view web part via designer.
6.   Add the list view web part to each site selecting the appropriate view to use.
7.      Edit the page in SharePoint Designer 2010.
8.      Place cursor in the column you wish to modify.
9.      Click Design in the List View Tools on the ribbon.
10.     Then click Customize XSLT and select Customize Item. Select this option otherwise you will generate a **LOT** of unnecessary XSL code.
11.     You are looking for a piece that resembles the following:
        <xsl:with-param name="fieldtitle">
          <xsl:value-of select="@DisplayName"/>
        </xsl:with-param>
12.      Modify it by typing in the actual column name you want. You should end up with something like this:
        <xsl:with-param name="fieldtitle">
          New Column Name.
        </xsl:with-param>
13.      Now, for this page only, the column will be renamed.
There are some caveats:
1.   Doesn’t appear to work in a publishing portal. I think this has to do with how SP stores the pages in this case. In a publishing portal you can only modify the page layout which won’t work as we need to modify the content.
2.   If you add another column, you will need to repeat the XSLT modification
Anyways, I hope this helps out any others with the same issue or need as I had.

JTable custom column renderers

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