Setting a cell renderer for a Cell?

Hi everybody,
I'm sitting here with a problem: I'm trying to set a Cell renderer for a cell.
The problem is in all of the examples that i saw till now this was made only with columns.
Is it possible to set different CellRenderer foor different cells in the same column?

Hi,
if you implement your cellRenderer you return the Object you get for all columns but the one you want to be handled im a special way. As you know the row as well you can return sth different for each row.
Phil

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Is there a way to set another renderer for an entire table, a renderer that extends DefaultTableCellRenderer in particular. I mean I can think of a workaround where I basically go through each column of the JTable and set the default renderer for each column, but that seems like a hack. Shouldn't there be away to set it across the board?
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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

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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?
Hint - in the renderer compare tree.getModel().getRoot() with the value using == .
>
Basically I have a checkbox at each node. So, I tried
setting the checkbox invisible for the root. Hard work! Since you are just wanting to change the rendering rule for the root you should change the renderer.
>
But then all the nodes have an invisible
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take there:
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// Assuming that each element of the array will be false initially
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greetings Marsian

How do I set a BG Image for a specific Table Cell?

Hello...
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Use CSS -
td.special { background-image:url(foo.gif); }
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> Hello...
>
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cell without it
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>
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> J

Setting table cell background

Friends,
I have a JTable with 5 rows and 4 columns now I want to set the Background color of cells as I select the set of cells it changes the background color.
the problem in the below code is I have to select the individual cells to set the bg. can anyone tell what I should add to set bg of all the selection + I am unable to see the cell selection.
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
* This is like TableDemo, except that it substitutes a
* Favorite Color column for the Last Name column and specifies
* a custom cell renderer and editor for the color data.
public class TestClass extends JPanel implements MouseListener {
     private boolean DEBUG = false;
     private JTable table;
     private Color defColor = Color.WHITE;
     private Color selColor = Color.GRAY;
     private Color[][] color = {
          {defColor, defColor, defColor, defColor, defColor},
          {defColor, defColor, defColor, defColor, defColor},
          {defColor, defColor, defColor, defColor, defColor},
          {defColor, defColor, defColor, defColor, defColor},
          {defColor, defColor, defColor, defColor, defColor}
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          super(new GridLayout(1,0));
          table = new JTable(new MyTableModel());
          table.setRowSelectionAllowed(false);
          table.setCellSelectionEnabled(true);
          table.addMouseListener(this);
          table.setPreferredScrollableViewportSize(new Dimension(500, 70));
          //Create the scroll pane and add the table to it.
          JScrollPane scrollPane = new JScrollPane(table);
          //Set up renderer and editor for the Favorite Color column.
          table.setDefaultRenderer(String.class,
                                         new ColorRenderer(color));
          //Add the scroll pane to this panel.
          add(scrollPane);
     class MyTableModel extends AbstractTableModel {
          private String[] columnNames = {"First Name",
                                                  "Favorite Color",
                                                  "Sport",
                                                  "# of Years",
                                                  "Vegetarian"};
          private Object[][] data = {
          public int getColumnCount() {
               return columnNames.length;
          public int getRowCount() {
               return data.length;
          public String getColumnName(int col) {
               return columnNames[col];
          public Object getValueAt(int row, int col) {
               return data[row][col];
           * JTable uses this method to determine the default renderer/
           * editor for each cell. If we didn't implement this method,
           * then the last column would contain text ("true"/"false"),
           * rather than a check box.
          public Class getColumnClass(int c) {
               return getValueAt(0, c).getClass();
          public boolean isCellEditable(int row, int col) {
               return false;
          public void setValueAt(Object value, int row, int col) {
               if (DEBUG) {
                    System.out.println("Setting value at " + row + "," + col
                                           + " to " + value
                                           + " (an instance of "
                                           + value.getClass() + ")");
               data[row][col] = value;
               fireTableCellUpdated(row, col);
               if (DEBUG) {
                    System.out.println("New value of data:");
                    printDebugData();
          private void printDebugData() {
               int numRows = getRowCount();
               int numCols = getColumnCount();
               for (int i=0; i < numRows; i++) {
                    System.out.print("    row " + i + ":");
                    for (int j=0; j < numCols; j++) {
                         System.out.print(" " + data[i][j]);
                    System.out.println();
               System.out.println("--------------------------");
      * Create the GUI and show it. For thread safety,
      * this method should be invoked from the
      * event-dispatching thread.
     private static void createAndShowGUI() {
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          JFrame.setDefaultLookAndFeelDecorated(true);
          //Create and set up the window.
          JFrame frame = new JFrame("TableDialogEditDemo");
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          //Create and set up the content pane.
          JComponent newContentPane = new TestClass();
          newContentPane.setOpaque(true); //content panes must be opaque
          frame.setContentPane(newContentPane);
          //Display the window.
          frame.pack();
          frame.setVisible(true);
     public static void main(String[] args) {
          //Schedule a job for the event-dispatching thread:
          //creating and showing this application's GUI.
          javax.swing.SwingUtilities.invokeLater(new Runnable() {
               public void run() {
                    createAndShowGUI();
     /* (non-Javadoc)
      * @see java.awt.event.MouseListener#mouseClicked(java.awt.event.MouseEvent)
     public void mouseClicked(MouseEvent e) {
          if (table.getSelectedColumn() > 0) {
               if (color[table.getSelectedRow()][table.getSelectedColumn()] == selColor) {
                    color[table.getSelectedRow()][table.getSelectedColumn()] = defColor;
               } else {
                    color[table.getSelectedRow()][table.getSelectedColumn()] = selColor;
          } else {
          ((MyTableModel)table.getModel()).fireTableStructureChanged();
     /* (non-Javadoc)
      * @see java.awt.event.MouseListener#mouseEntered(java.awt.event.MouseEvent)
     public void mouseEntered(MouseEvent e) {
     /* (non-Javadoc)
      * @see java.awt.event.MouseListener#mouseExited(java.awt.event.MouseEvent)
     public void mouseExited(MouseEvent e) {
     /* (non-Javadoc)
      * @see java.awt.event.MouseListener#mousePressed(java.awt.event.MouseEvent)
     public void mousePressed(MouseEvent e) {
     /* (non-Javadoc)
      * @see java.awt.event.MouseListener#mouseReleased(java.awt.event.MouseEvent)
     public void mouseReleased(MouseEvent e) {
import javax.swing.JLabel;
import javax.swing.JTable;
import javax.swing.border.Border;
import javax.swing.table.TableCellRenderer;
import java.awt.Color;
import java.awt.Component;
public class TableCellColorRenderer extends JLabel
                           implements TableCellRenderer {
    Color[][] colorBG = null;
    public TableCellColorRenderer(Color[][] color) {
        this.colorBG = color;
        setOpaque(true); //MUST do this for background to show up.
    public Component getTableCellRendererComponent(
                            JTable table, Object color,
                            boolean isSelected, boolean hasFocus,
                            int row, int column) {
          setBackground(colorBG[row][column]);
        return this;

I would guess that it's because you set the background to Color.WHITE
I'm not sure why you're passing in an array of Color objects ... typically you'd either pick the color based on the value of the cell, or use standard colors.
Finally, your getTableCellRendererComponent() should check the isSelected argument, and use a different color to highlight the selection.

Setting JTable cell editor

Hallo,
I have troubles setting jtable cell edtior. when i run code below, editor stays unchnaged.
Do you know where's the problem, please (except in programmer^_^) ???
import java.awt.*;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
public class Test extends JFrame {
    JTable table;
    Test() {
        // Create table model
        table = new JTable();
        table.setModel(new DefaultTableModel(
            new Object[][] {
                { Boolean.TRUE, Integer.valueOf(10) },
                { "Hallo!", Boolean.FALSE },
            }, new String[] { "Col1", "Col2" }));
        // Setup frame a little
        setLayout(new BorderLayout());
        setBounds(new Rectangle(300,300,200,100));
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        add(table,BorderLayout.CENTER);
         * Two calls below have no effect:-(
         * What did i wrong?
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        table.setCellEditor(new DefaultCellEditor(
                new JComboBox(new String[] { "0", "1" }) ));
        // Use checkbox for booleans
        table.setDefaultEditor(Boolean.class, new DefaultCellEditor(
                new JCheckBox() ));
        // Use combobox for strings
        table.setDefaultEditor(String.class, new DefaultCellEditor(
                new JComboBox( new String[] { "Hallo!", "Bye!" } ) ));
    public static void main(String[] arg) {
        Test test = new Test();
        test.setVisible(true);
}

Hi again,
yes it works when i set it for single column, but i'd like to use default editor, because column count is not fixed.
According to documentation: "Sets a default cell editor to be used if no editor has been set in a TableColumn. If no editing is required in a table, or a particular column in a table, uses the isCellEditable method in the TableModel interface to ensure that this JTable will not start an editor in these columns. If editor is null, removes the default editor for this column class."
So when i call
column.setCellEditor(null); in TableColumnModelListener columnAdded event. But still it's not working. See sample below (i've changed it to cell renderer coz result is clear on single view, but problem stays same)
More over problem seems to be with algoritm that decide which class to use. Object takes preference any time. W/o it npe arries.
Regards
Adam
import java.awt.*;
import javax.swing.*;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
public class Test extends JFrame {
    JTable table;
    Test() {
        // Create table model
        table = new JTable();
        table.setModel(new DefaultTableModel(
            new Object[][] {
                { Boolean.TRUE, Integer.valueOf(10) },
                { "Hallo!", Boolean.FALSE },
            }, new String[] { "Col1", "Col2" }));
        // Setup frame a little
        setLayout(new BorderLayout());
        setBounds(new Rectangle(300,300,200,100));
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        add(table,BorderLayout.CENTER);
        table.setDefaultRenderer(Object.class,new Renderer(Color.YELLOW));
        table.setDefaultRenderer(String.class,new Renderer(Color.BLUE));
        table.setDefaultRenderer(Boolean.class,new Renderer(Color.RED));
        table.setDefaultRenderer(Integer.class,new Renderer(Color.GREEN));
        // use default renderer in all columns
        table.getColumn(table.getColumnName(0)).setCellRenderer(null);
        table.getColumn(table.getColumnName(0)).setCellRenderer(null);
    public static void main(String[] arg) {
        Test test = new Test();
        test.setVisible(true);
    class Renderer extends DefaultTableCellRenderer {
        Color color;
        Renderer(Color color) { this.color = color; }
        public Component getTableCellRendererComponent(JTable table, Object value,
                boolean isSelected, boolean hasFocus, int row, int column) {
            super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
            setBackground(color);
            setToolTipText("Class is "+value.getClass().getName());
            return this;
}Message was edited by:
a3cchan

Setting a renderer for an element dynamically at runtime

Currently i am searching for a UI feature : Generating a HTML table by setting the renderer for each cell dynamically at runtime. E.g. depending on some state dependency(e.g. authorization issue) i want to render information in a cell in one case as a hyperlink or a in the other case as a informational text (instead of the hyperlink).
My question : is that feature in JSF Framework implemented or adaptable? Viewing some JSP/JSF code, the definition of the renderer seems to me to be determined at compile time, and there is no example how to do as described above.
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2nd is if all the cell are the same component type, you even can extends the component to override the getRendererType() method making to returne a different value based on the state.

Iam using a table in numbers to plot daily graph lines. If I fill a cell with a text box at say zero it plots the graph. I can't actually set the cell value until the actual day but the graph plots it at zero when I don't want it to plot anything. Is tho

I am using a table in Numbers to plot daily graph lines. Mood swings of how I am on the day, i"m a depressive.
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The answer is (sort of) in your subject, but edited out of the problem statement in the body of your message.
When you use a stepper or a slider, the value in the cell is always numeric, and is always placed on the chart if that cell is included in the range graphed by the chart.
But if you use a pop-up menu cell, you can specify numeric or text values in the list of choices for in the menu. Numeric values will be shown on the chart. Text values will not.
For the example, the values list for the pop-up menu was:
5
3
1
Choose
-1
-3
-5
The first pop-up was set to display Choose, then the cell was filled down the rest of the column. Any text value (including a single space, if you want the cell to appear blank) may be used instead of Choose.
For charts with negative Y values, the X axis will not automatically appear at Y=0. If your value set will include negative values, I would suggest setting the Y axis maximum and minimum to the maximum and minimum values on your menu list, rather than letting Numbers decide what range to include on the chart. Place a line shape across the chart at the zero level, and choose to NOT show the X axis.
Regards,
Barry

How do I remove a selected set of cells?

How do I remove or delete a selected set of cells (ex. rectangle of C1 to E26).
In Excel, I can delete such a group of cells and all the data to the right of those cells shifts over.
Is this possible in Numbers or should I just go back to Excel?

Michael Force wrote:
Thank you for your attempt to help. This does not work for me, perhaps because I failed to fully understand what Yvan is trying to say. You are saying I need to delete cells at the bottom of the column,
It's not what I wrote.
Assuming that you want to remove cells C12 thru C14, I asked you to select cells C15 thru C9999999 then move the selected block to cell C12.
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Your problem is different than the original one which was:
I want to delete a range of cells in a single column, say for instance 3 cells, and have the entire column shift up 3 cells.
and I'm not sure that the "Delete cells" function of Excel will do the trick.
I assumes (because you didn't give the complete info) that you want to remove cells C12 thru C14.
Select cells C15 thru C40, move the block to C12.
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Yvan KOENIG (from FRANCE lundi 17 novembre 2008 11:59:29)

How to set the cell size in a JFrame

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JFrame frame = new JFrame("Window");
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smithbrian wrote:
When I am placing a component on the grid I want to be sure the component is exactly where I place it. In order to do that I would need to know what is the size of the gird and how to change the size of the gird in the JFrame.What grid?? You're assuming that we know much more about your program than we actually do. We actually know zip. Please read this help site which will help you to avoid similar errors in posting questions here. It has helped me in the past: [smart questions|http://www.catb.org/~esr/faqs/smart-questions.html]

Setting a cell renderer for a Cell?

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