JTable in JPanel last Column resize clips JTable doesnt repaint JPanel

I have a JTable in a JPanel, when I drag the last column of the JTableHeader (u can see the column resizing as the text of the Table HeaderColumn moves with the drag) the JTable is outside the JPanel. Only when u click on another component and then click back on the JTableHeader does it repaint.
I have tried jPanel.revalidate(); in the mouseDragged event of MouseMotionListener on the JTableHeader and all manner or repaints and fireTableStructureChanged. But I dont understand the order of events.
The last bug to fix!!!
NB I dont want to use scrollpane as its not necessary and as many tables are synchronized with one table it makes repaints less smooth
Thanks Paul

Well, I didn't find an answer but I did find a solution.
The JPanel is the problem. I use it to help with layout which is not obvious in this example.
As you can see in the code the JTable is placed in a JScrollPane which is place in a JPanel which is placed in a JTabbedPane.
If I use Box instead of JPanel the JTable in the JScrollPane in the Box in the TabbedPane in the JFrame resizes correclty.
So although JPanel is resizable with setSize it does not get resized when it's JFrame gets resized.
I would still like to know why?
////////KBS
JTabbedPane myTP = new JTabbedPane();
Box myOne = Box.createHorizontalBox();
Box myTwo = Box.createHorizontalBox();
myOne.add(pane);
myTP.add("One", myOne);
myTP.add("Two", myTwo);
////////KBS

Similar Messages

Last column in JTable detaches from edge of JScroll Pane

i have a JTable in a JScrollPane which is in half of a JSplitPane.
The table has autoResizeMode set to AUTO_RESIZE_OFF to make the horizontal scrollbar appear.
However, when i resize the split pane to make the table bigger, the edge of the last column no longer runs to the edge of the JScrollPane, it detaches.
What i need is for the last column to be able to expand infinitely, but when the split pane size is being reduced, for the columns to disapear off the edge of the scroll pane and the scroll bar to appear. This is a mix of AUTO_RESIZE_OFF and AUTO_RESIZE_LAST_COLUMN.

I too had this problem. I had a method that would set the minimum size of columns based on the data within the table, etc. It seems that when you do anything to set the pref or min size of a column the horizontal scrolling gets all messed up. How I solved the problem is to basically swap the autosize method on the table back and forth whenever the parent component of the table is resized. Some example code follows.
First, add a inner class ComponentListener on the parent component the table is in (a frame in my case, I guess this could be the scroll pane too?):
_myFrame.addComponentListener( new ComponentAdapter()
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private void _parentResized()
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You need to make sure to call the _parentResized() method as well whenver you do something else that might cause the pref width of the table to be resized (like you repopulate and calc pref widths, etc.)
Hope this is of some use to you.

JTable: resizing all columns as 1 column resizes

I have a JTable with 480 columns inside of a JScrollPane (AUTO_RESIZE_ALL_COLUMNS needs to be off for the JTABLE to display correctly in the JScrollPane). When the user resizes one column I would like the rest of the columns to resize too, so that the column widths of each column are equal.
Thank you in advance,
Brent

[...] I
I have the JScrollPane listening to a histogram of the
balances so the user can click on a month in the
histogram and the JScrollPane (actually JViewport)
will move to display the appropriate column in the
JTable. If the column sizes are not uniform then I
cannot be sure that I'm moving the JViewport to
display the correct JTable column(s).
I thing the GUI is a great design for what must be
done. And thank you for your help and comments.That still sounds pretty klunky. I don't see any user navigating around a 480 column table. They click in your histogram to go to a column, they click somewhere or do keyboard navigation and the display scrolls them a few columns/rows away... they are now lost in a sea of cells and have to go back to the histogram again to try and get back, etc. Having delt with similar situations, there are better ways. Read the last two days dilbert cartoons carefully. :-)
But anyway...
You don't have to have all the columns the same width to make a column visible in the viewport. You can just get the appropriate column's rect by either of these methods:Rectangle r = myTable.getTableHeader().getHeaderRect( col );
Rectangle r = myTable.getCellRect( row, col, true );And then tell the viewport to make sure that rect is visible:myViewport.scrollRectToVisible( r );Much easier than hacking around with custom column resizing logic.

Mapping of JTable Rows and columns and paint it to the JPanel

Hi,
I am using JTable and graphics object to draw the JTable on JPanel. But due to some lack of measurement I am not able to draw table cells correctly.
Apart from this on changing the fontSize I have to redraw it according to the requirement. But when the data size increases it draws absurdly.
I am using jTable.getCellRect() api to get the row width and height. Please help to redraw a JTable cell row and height on JPanel.
I am also attaching a sample code with this mail.
Thanks,
Ajay
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.*;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.table.*;
import java.util.*;
import java.awt.*;
public class SimpleTableDemo extends JPanel {
    private boolean DEBUG = false;
       private int spacing = 6;
       private Map columnSizes = new HashMap();
       String[] columnNames = {"First Name",
                                "Last Name",
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                                "# of Years",
                                "Vegetarian"};
        Object[][] data = {
         {"Kathy", "Smith",
          "SnowboardingXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", new Integer(5), new Boolean(false)},
         {"John", "Doe",
          "Rowing", new Integer(3), new Boolean(true)},
         {"Sue", "Black",
          "Knitting", new Integer(2), new Boolean(false)},
         {"Jane", "White",
          "Speed reading", new Integer(20), new Boolean(true)},
         {"Joe", "Brown",
          "Pool", new Integer(10), new Boolean(false)}
        final JTable table = new JTable(data, columnNames);
          Panel1 panel;
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        //table.setFillsViewportHeight(true);
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            table.addMouseListener(new MouseAdapter() {
                public void mouseClicked(MouseEvent e) {
                    printDebugData(table);
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        JScrollPane scrollPane = new JScrollPane(table);
        //Add the scroll pane to this panel.
        add(scrollPane);
        panel = new Panel1();
        Rectangle rect = table.getCellRect(0,0,true);
          panel.setX(table.getWidth());
          panel.setY(0);
        panel.setWidth(rect.width);
          panel.setHeight(rect.height);
        panel.setStr(table.getModel().getValueAt(0,0).toString());
          panel.setModel(table);
          add(panel);
        final JComboBox jNumberComboBoxSize = new JComboBox();
          jNumberComboBoxSize.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "11", "12", "14", "16", "18", "20", "24", "30", "36", "48", "72" }));
        jNumberComboBoxSize.addActionListener(new java.awt.event.ActionListener() {
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          table.setFont(new Font("Serif", Font.BOLD, fontSize));
          Rectangle rect = table.getCellRect(0,0,true);
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          panel.setY(0);
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          panel.setHeight(rect.height);
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        int numRows = table.getRowCount();
        int numCols = table.getColumnCount();
        javax.swing.table.TableModel model = table.getModel();
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        for (int i=0; i < numRows; i++) {
            System.out.print("    row " + i + ":");
            for (int j=0; j < numCols; j++) {
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          int columnDataWidth   = getColumnDataWidth( column );
          int preferredWidth    = Math.max(columnHeaderWidth, columnDataWidth);
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          Object value = tableColumn.getHeaderValue();
          TableCellRenderer renderer = tableColumn.getHeaderRenderer();
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          int maxWidth = table.getColumnModel().getColumn(column).getMaxWidth();
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              preferredWidth = Math.max(preferredWidth, getCellDataWidth(row, column));
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               if (preferredWidth >= maxWidth)
                   break;
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          // Inovke the renderer for the cell to calculate the preferred width
          TableCellRenderer cellRenderer = table.getCellRenderer(row, column);
          Component c = table.prepareRenderer(cellRenderer, row, column);
          int width = c.getPreferredSize().width + table.getIntercellSpacing().width;
          return width;
      * Update the TableColumn with the newly calculated width
     private void updateTableColumn(int column, int width)
          final TableColumn tableColumn = table.getColumnModel().getColumn(column);
          if (! tableColumn.getResizable()) return;
          width += spacing;
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          width = Math.max(width, tableColumn.getPreferredWidth());
          columnSizes.put(tableColumn, new Integer(tableColumn.getWidth()));
          table.getTableHeader().setResizingColumn(tableColumn);
          tableColumn.setWidth(width);
     * Create the GUI and show it. For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("SimpleTableDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //Create and set up the content pane.
        SimpleTableDemo newContentPane = new SimpleTableDemo();
        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();
class Panel1 extends JPanel
    int x;
     int y;
     int width;
     int height;
     String str;
     JTable model;
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       this.model = model;
     public void setX(int x)
          this.x = x;
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          this.y = y;
     public void setWidth(int w)
          this.width = w;
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          this.height = h;
     public void setStr(String s)
          this.str = s;
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         super.paint(g);
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               initX = x;
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               y = y + height;
};

an easy way would be to use setSize()

Resize column width for JTable without column headers?

Hi,
I find that for me to resize columns of a JTable by using
mouse dragging, I MUST have column headers and then drag
column headers to resize them. Is my understanding correct?
Actually, I need to have a table without header columns.
How can I use mouse to resize column width by dragging?
The background for this request is that I am putting a
complex table as another table's column header and I hope to
be able to resizing the complex table by mouse dragging.
Thanks very much,
David

Hi,
I think you have mistake there. Try
<style type="text/css">
table.apexir_WORKSHEET_DATA td {
white-space:nowrap !important;
td[headers="DESCR"] {
width:300px !important;
max-width:300px !important;
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max-width:300px !important;
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Jari
My Blog: http://dbswh.webhop.net/htmldb/f?p=BLOG:HOME:0
Twitter: http://www.twitter.com/jariolai

How to listen for resizing of JTable column

Is there anyway to tell when the columns in a JTable are being resized by the user? I couldn't find any listeners or anything that will tell you when the user is dragging the column width with the mouse.
Thanks.

Use ColumnModelListener as shown below:-
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               public void columnMoved(TableColumnModelEvent e) {
               public void columnRemoved(TableColumnModelEvent e) {
               public void columnMarginChanged(ChangeEvent e) {
               public void columnSelectionChanged(ListSelectionEvent e) {
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Giving names to the columns in a JTable

Hi,
I am using JTable(int numRows, int numColumns) constructor to create a JTable. After I built my application I came to knw that I cannot change the column names. The JTable in my GUI will keep on changing and the no. of rows,columns and even the column names may also change. I just wanted to know what constructor I should shift to.
Thanks,
Adhiraj

I would use something like the following:
DefaultTableModel model = new DefaultTableModel(columnNames, rowCount);
JTable table = new JTable( model );
The following code gives some examples on using the DefaultTableModel to add rows and columns:
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
public class TableRowColumn extends JFrame
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                    buttonPanel.getComponent(4).setEnabled( false );
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          Object[] newRow = new Object[2];
          int row = table.getRowCount() + 1;
          newRow[0] = Integer.toString( row );
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ICE

Hide a column in a JTable

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import java.awt.Dimension;
import java.awt.Point;
import java.awt.event.MouseEvent;
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import javax.swing.JScrollPane;
import javax.swing.JTable;
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import javax.swing.UIManager;
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                    int    realIndex = columnModel.getColumn(index).getModelIndex();
                    return colHeadTips[realIndex];
    // simplified class for usage inside a cell
    public class MiniModel {
        private int        mml_id;
        private String     mml_comment;
        public MiniModel(int mml_id, String mml_comment) {
            this.mml_id      = mml_id;
            this.mml_comment = mml_comment;
        public String getMml_comment() {
            return mml_comment;
        public String toString() {
            return Integer.toString(mml_id); // called when object is displayed
    public static void main(String[] args) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (Exception ex) {
                    ex.printStackTrace();
                new TableHide().setVisible(true);
}When you show the last column the program works fine. Goal is to have the last column available since it contains extra information about the row, but not to show it.

Setting the Size of a Column in a JTable

Hi there,
does anybody knows a way how to set the size of a specified column in a JTable without changinge the size of the other columns?
thx anyway
Errraddicator

You've got to change the JTable's column resizing policy to prevent the other columns resizing:
JTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF)Otherwise all the columns will be adjusted to fit into the width of the table - changing one column would have to result in at least one other column changing!
Hope this helps.

JTable when scroll horiz column cells dont align with header

Hi,
I'm having a problem with my JTable. Everything was working correctly until i introduced checkboxes into a column on teh table. I have a table which has a horizontal scrollbar to scroll across all the columns. when i set one column to boolean values (instead of the strings 'true' and 'false' which were there before) when i scroll across the table the headers of each column no longer align with the data.
Some columns resize when i scroll and the headings always stay the same width.
I'm getting an error:
java.lang.ClassCastException
at javax.swing.JTable$BooleanRenderer.getTableCellRendererComponent(Unknown Source)The database stores int 0/1 for the boolean value so in the getValueAt method of my table model i return a boolean for this column.
Any help would be greatly appreciated!
Thanks,
Saz

Thanks for replying. Neither solution worked.
The problem is definately with the boolean value because i'm getting a classcast exception: at javax.swing.JTable$BooleanRenderer.getTableCellRendererComponent(Unknown Source)
I've a feeling this could be caused by some values being empty strings in the same column with booleans?
Does anyone know what causes this error?
Thanks,
Sarah

Horizontal scrolling in a JTable with fixed-size columns

Hello,
I have come to a roadblock concerning the following issue. Perhaps someone can share their ideas...
I have a JTable with three fixed-size columns. I implemented a JScrollPane with vertical and horizontal scrolling. However, the text inserted into the last column is too long to fit in the specified column width. I would like to be able to scroll the table so that I can view all of the text in the last column. Right now, the text cuts off and ends with three dots (...). Is there a way in which a horizontal scroll bar can be implemented to view all the text in the last column?
Here is a portion of my code:
num_of_rows_Table2 = (int) Math.pow(3, num_of_vars);
String[] colunmNames_Table2 = {"Decimal Identifier", "Ternary Identifier", "Cancellation of nonimplicants"};
dataModel2 = new DefaultTableModel(colunmNames_Table2, num_of_rows_Table2);
SpaceOfTermsTable = new JTable(dataModel2);
for (int z = 0; z < num_of_rows_Table2; z++)
SpaceOfTermsTable.setRowHeight(z, row_height);
SpaceOfTermsTable.setBounds(new Rectangle(x1_Table2, y1_Table2, width_of_pane2, height_pane2));
SpaceOfTermsTable.getTableHeader().setReorderingAllowed(false);
for (int i = 0; i < 2; i++)
TableColumn col = SpaceOfTermsTable.getColumnModel().getColumn(i);
col.setMinWidth(colwidth_Table2);
col.setMaxWidth(colwidth_Table2);
col.setPreferredWidth(colwidth_Table2);
TableColumn lastcol = SpaceOfTermsTable.getColumnModel().getColumn(2); lastcol.setMinWidth(lastcol_Table2);
lastcol.setMaxWidth(lastcol_Table2);
lastcol.setPreferredWidth(lastcol_Table2);
SpaceOfTermsTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
scrollPanel2 = new JScrollPane(SpaceOfTermsTable, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scrollPanel2.setAutoscrolls(true);
scrollPanel2.setBounds(new Rectangle(x1_Table2, y1_Table2, width_of_pane2, height_pane2));
Thanks in advance for all of the help!

Hi, I hava a similar problem than yours - can you tell me how you sorted out yer's?

Set column width in JTable

I have two columns in a JTable and I am trying to set the column width for the first.
I am trying to this by
getDataTbl().getColumnModel().getColumn(0).setHeaderValue("Index");
getDataTbl().getColumnModel().getColumn(1).setHeaderValue(" Data ");
int width = ((String)getDataTbl().getColumnModel().getColumn(0).getHeaderValue()).length();
getDataTbl().getColumnModel().getColumn(0).setPreferredWidth(width);
but it doesn't reset the width. I want the first column width to be smaller than the second which should be much larger width.
Any suggessions to this?
Thanks.

Hi there
Use this JTable method
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);This should solve your resize problem
ICE

Retarded Column Heading of JTable

I have a JTable where I allow automatic resizing of the columns because the user may choose between things of varying lengths to add to the table from a list. I have disabled reordering and resizing in the Table Header. However, the first column heading, "Response Variable", always shows up as "Response.." until you select at least one item from the list. It is driving me crazy. Why won't the entire column name show up all the time, regardless of how many rows the table has?

try setting the TableColumn minWidth to the minimum size of the column heading. use the method setMinWidth(int minWidth) located in the TableColumn class. This should fix the problem. Let me know

Resizing the JTable Cell horizontal width

Sir/Madam,
How can i resize the JTable cell's horizontal width. I know the JTable's column width can be resized. I dont want to resize the entire JTable column. But i need to resize individual JTable cell's horizontal width. Thanks in advance.

I think that's not possible. What kind of results are you expecting ? If the cells of a column are different widths, what are you going to do with the extra space of the narrower cells ?
What are you displaying in the cells ? Maybe you can narrow the contents of the cells, and not the cells.

JTable in JPanel last Column resize clips JTable doesnt repaint JPanel

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