JTable custom cell renderer for each cell

Hi,
Iam trying to implement a JTable in which each cell in a column can be of a different type. i.e it can be a tree node or plain text. Can someone point me to examples where this has been done.
Iam trying to override getColumnClass but it only takes a column no as parameter. I would like to return a different type depending on the row for which getColumnClass is called. It would help if getColumnClass could take 2 params (row and column). Can someone help.
Cheers,
vidyut

You can override getCellRenderer(int row, int column) of JTable

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Hi,
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Well I tried that and it didn't work.I do it without any problems so what how did you do it?
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>
Basically I have a checkbox at each node. So, I tried
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>
But then all the nodes have an invisible
checkbox.............................

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hi guys i need your help and sorry if my english is very bad..guys how can i apply different colors for each cell in jlist component? for example for the first cell i want to apply color blue, for the second cell i want red, etc... i need your answer guys tnx..
Edited by: ryrene on Mar 21, 2010 12:13 AM

ryrene wrote:
hi guys i need your help and sorry if my english is very bad.
..guys how can i apply different colors for each cell in jlist component? for example for the first cell i want to apply color blue, for the second cell i want red, etc... i need your answer guys tnx..I'll see your tnx, and raise you dve bmbrs & nplm.

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Have you got the solution for this problem?

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I have an application that requires to display a list of tree-structured data.
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greetings Marsian

Different link for each cell on table item

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<object>
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The question:
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Not statically, but you can do this in code:
That's a method on the left and a property on the right.
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Try to take over the world!

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I am new to BAM. I have a requirement for which I am using crosstab. Basically, I need to show number instances per human task per user. Human Task is the row header, user is the column header, and I am using count(instance id) to fetch the count of instances. I am able to show the sum of values for each row and column, but I also need to show the percentage for each cell(based on row total).
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Hi,
For constructing summary, COLLECT is very useful.
1. Create one new internal table STAB having two fields.
a) licensetype
b) cnt
2. Suppose your original internal table is itab.
Loop at ITAB.
STAB-licensetype = itab-licensetype.
STAB-CNT = 1.
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EndLoop.
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Table cell Render for one cell

Hi all
I am hoping that someone can help me with a cell render for one cell only.
I am needing to make some cells bold.
What i was hoping is that there is a way of passing in a row and column number to make that cells font bold?
Any ideas ??
I am building a List of accounts that I what to look like this.
1-0000 Asset |Asset|Balance
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1-2000 Credit Cards |Credit|Balance
1-2020 Visa |Credit Card|Balance
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Create a renderer like you've done in the past:
http://forum.java.sun.com/thread.jspa?threadID=679718&start=2
The renderer knows the row and column you are doing the renderering on so you just need to add a conditional check:
if (aBoldCell)
setFont( getFont().deriveFont(...) );
else
setFont( table.getFont() );

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Hi,
is it possible to configure separate subpixel rendering for each monitor? I use a multi monitor setup with 2 additional inverted screens (via xrandr). Each screen has a RGB subpixel mapping. The font rendering on the inverted screens looks odd, because they would need BGR mappings. Thats my guess at least, tested it via http://www.lagom.nl/lcd-test/subpixel.php

Unfortunately there is no way to have separte subpixel rendering for each monitor. The library doing the rendering (freetype), would have to know which screen you are on and adjust dynamically. Plus, suppose you have half of a window on one screen and half on another - it wouldn't know which to choose.
I would like to be able to do this, too, for my rotated monitor.
I am sure it is technically possible, but not without a major redesign of how the applications render the fonts.

Custom Cell Renderer for JTable

Help, I'm trying to write a custom renderer for a column of my JTable but can't get it to work.
Want I want is a cell in that column to be a label with an Icon and text.
Trying to test with something simple, just changing colors but even that doesn't work. Can anyone see where I've gone wrong.
table = new JTable(tableModel);
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
table.setShowGrid(false);
TableColumn tc = table.getColumnModel().getColumn(0);
tc.setCellRenderer(new DefaultTableCellRenderer() {
   public Component getTableCellRendererComponent(JTable table,
                                               Object value,
                                               boolean isSelected,
                                               boolean hasFocus,
                                               int row,
                                               int column)
         JLabel label = (JLabel)
            super.getTableCellRendererComponent
               (table, value, isSelected, hasFocus, row, column);
            label.setForeground(Color.red);
            label.setBackground(Color.black);
            System.out.println("Object: "+ value);
            return label;
});Thanks,
Derek

Hi
For colors try :
all your code
but where you call super.getTableCellRendererComponent(......
do only setText(value.toString());
I supose it is Ok just for changing the colors. If you want render
an Icon plus some text you can put at your model a JLabel and at this
render do
setText((JLabel)value.getText());
setIcon((JLabel)value.getIcon());
inside a try/catch clause becasue you can put other kind of object at
model level
Or pass instances of an special Class with Icon/Text with publics members set/get to acces to text/icon.
Hope this help

Custom Cell Renderer for JList

I'm getting some strange behaviour from my custom cell renderer.
import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
public class TestRenderer implements ListCellRenderer {
private JPanel jpCell = new JPanel();
public Component getListCellRendererComponent
      (JList list, Object value, int index, boolean isSelected,
       boolean cellHasFocus) {
    jpCell.add(new JLabel("Render"));
    return jpCell;
import javax.swing.*;
import java.awt.*;
public class TestPanel extends JFrame {
     public TestPanel() {
          JList jlst = new JList(new String[]{"Value", "Value2", "Value3"});
          jlst.setCellRenderer(new TestRenderer());
          JPanel panel = new JPanel();
          panel.add(jlst);
          add(panel);
     public static void main(String[] args) {
          TestPanel frame = new TestPanel();
          frame.setSize(300, 300);
          frame.setLocationRelativeTo(null);
          frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
          frame.setVisible(true);
}As you will see the renderer displays the string several times in each cell depending on which layout manager I use. However, if I replace the JPanel with a JLabel and set the String as text on the label the String is only printed once per cell. I can't see to find the reason for this.
Edited by: 811488 on 18-Nov-2010 09:44
Edited by: 811488 on 18-Nov-2010 09:45
Edited by: 811488 on 18-Nov-2010 09:45

So getListCellRendererComponent returns a component whose paintComponent method is called with the Graphics object of the JList Yes, except that the paint(...) method is called. There is a difference. paintComponent() only paints the component. In the case of a JPanel you would get a boring gray colored component. paint() will paint the component and its children and the Border of the component as well. So you get a much more exiting component.
Read the section from the Swng tutorial on [url http://download.oracle.com/javase/tutorial/uiswing/painting/index.html]Custom Painting for more information.
So the state of the cell is not the state of the cell Renderer Component meaning the image rendered onto the cell only reflects the state of the Cell Renderer Component at the time the cell was rendered.Yes which is why this method should be efficient because repainting is consistently being done for all the cells. For example every time row selection changes multiple rows need to be repainted. Think of this same concept when you use a JTable which also contains multiple columns for each row.
That is why you should not be adding/removing components in the rendering code.
It makes sense except that if this was the case the first version of the Render that I posted should have been rendered first with one "Render" then two then three, shouldn't it?Yes, except that you can't control when or how often the rendering is done. Add the following to the renderer:
System.out.println(index + " : " + jpCell.getComponentCount());You will see that rendering is done multiple times. The JList tries to determine its preferred width. To do this it loops through all the items in the list and invokes the renderer to get the width of the largest renderer. Well the largest width is the last renderer because 3 labels have been added to the panel. So that width becomes the preferred width of the list. Then the GUI is displayed and the list is painted. Every time the renderer is called an new label is added, but after the 3rd label there is no room to paint the label so it is truncated.
Change your code to the following:
//add(panel);
add(jlst);Now change the width of the frame to see what happens.
Given all the help you have received, I expect to see many "helpfull answers" selected as well as a "correct answer" (if you want help in the future that is).

JTable - different editor for each cell?

I have a JTable where two columns have combo box editors. When the user makes a selection in one combo box, the other combo box's options must change, as its allowable options depend on selection in the other combo box.
So in short, I need a way of changing the combo box options for ONLY a specific cell, NOT the entire column. I currently only know how to do this for a whole column:
// first put stuff in myComboBox, and then...
myJTable.getColumnModel().getColumn().setCellEditor( new DefaultCellEditor( myComboBox ) );
Is there any way to change the values in the combo box of a specific cell, rather than the entire column?
I apologize if this is a newbish question... I am fairly new to Swing, but I didn't see anything addressing this in the documentation.
-Vern

The solution is like the one I gave you in one of
your previous postings. In that posting you wanted a
renderer for a specific cell. In this posting you
want a editor for a specific cell. The solution is
the same, only the method name changes.Okay, thanks. Sorry if it seems like I'm a slow learner. ;-)
-Vern

Various cell renders for cells (not for columns only) in JTable

Hello, I need to create a property list with some various values (strings, colors, booleans) just like in Netbeans do. I will use JTable component, but I found I cannot have various cell editors for cells. In JTable cell editors can be only changed for COLUMNS. What sould I do?
ps - is there any JPropertyPanel avaiable for free on the web?

I had a similar problem recently whilst working on a Swing GUI designer (you're not doing the same are you? ;o). Presuming you already know how to create TableCellEditors you can use a very simple hack to achieve your goal.
Either extend the JTable class and override the getCellEditor(int row, int column) method, or override the same method when constructing the JTable (this is what I did). You would need to write something like:
JTable myTable = new JTable(){
    public TableCellEditor getCellEditor(int row, int column) {
        TableModel model = getModel();
        Object data = model.getValueAt(row, column);
        return getDefaultEditor(data.getClass());
}The getCellEditor method is called by JTable whenever a cell is to edited, normally it would check to see if the TableColumn has an editor associated with it and return that, if there wasn't one it would get the class of data for the column and return the default editor for that type of class, which is similar to what it does here except it returns the default editor for the class of an individual item of datum.
Now all you need to do is associate your TableCellEditors with the class types they are to edit with the setDefaultEditor(Class c, TableCellEditor editor) method of JTable. If, for instance, you had an editor for the Color class you would have a line something like:
myTable.setDefaultEditor(Color.class, new ColorCellEditor());Good luck, and I hope this helps.
MS.

JTable custom cell renderer for each cell

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