JTextArea cannot be used as a renderer in JTable - scrolltoVisiblie technology
fails in this context.
-------------------------------------------------------------------------
Please see the following code to reproduce this bug.

The test took JTextArea as the CellRenderer of the first column. The table didn't show right.

import java.awt.*;
import java.awt.event.*;
import com.sun.java.swing.*;
import com.sun.java.swing.border.*;
import com.sun.java.swing.table.*;

public class TableCellRenderTest extends JFrame
{
    static public void main( String[] args )
    {
        TableCellRenderTest t = new TableCellRenderTest();
        t.pack();
        t.show();
    }

    String[][] data =
    {
        { "one", "two", "three" },
        { "four", "five", "six" },
        { "seven", "eight", "nine" },
        { "ten", "eleven", "twelve" },
        { "thirteen", "fourteen", "fifteen"},
        { "sixteen", "seventeen", "eighteen" },
        { "ninteen", "twenty", "twenty one" },
        { "twenty two", "twenty three", "twenty four" }
    };

    String[] colnames = { "column 1", "column 2", "column 3" };

    JTable table = new JTable( data, colnames );

    static private String clear = "Clear";
    static private String repaint = "Force Repaint";

    public TableCellRenderTest()
    {
        JScrollPane sp = JTable.createScrollPaneForTable( table );

        JPanel topPanel = new JPanel();
        topPanel.setLayout( new BorderLayout() );
        topPanel.setBorder( new EmptyBorder( 10, 10, 10, 10 ) );
        table.setBackground( topPanel.getBackground() );

        JPanel buttonPanel = new JPanel();

        topPanel.add( sp, BorderLayout.CENTER );
        topPanel.add( buttonPanel, BorderLayout.SOUTH );

        getContentPane().add( topPanel );

//CellRender
TableCellRenderer myRenderer = new CustomCellRenderer();
table.getColumn("column 1").setCellRenderer(myRenderer);
    }

  class CustomCellRenderer
    // extends JLabel
    extends JTextArea
    //extends JTextField
    implements TableCellRenderer
  {

    public Component getTableCellRendererComponent( JTable table,
Object value, boolean isSelected,
boolean hasFocus,
int row, int column )
    {
      setText( "Row=" + row );
      return this;
    }
  }
}

patience.chu@Eng 1998-03-16


From: Atul Dravid <###@###.###>
Sender: ###@###.###
To: ###@###.###
Subject: The JTextArea as cell renderer is having problem....
Date: Thu, 02 Apr 1998 17:34:29 -0800

Hi ,
I am trying to user JTextArea as TableCellRenderer and seems that it
load the table fine at first time..... But some event occurs and the
table gets reshuffled... The first column vanishes and the scrollpane
displays one column less than total number of columns....


Following is the source code....


Am I doing something wronge.....?


Let me know...


Thanks in advance....


import com.sun.java.swing.*;
import com.sun.java.swing.table.*;
import com.sun.java.swing.event.*;
import com.sun.java.swing.border.*;

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.net.*;

/*
 * @version 1.25 01/31/98
 * @author Philip Milne
 * @author Steve Wilson
 */
public class TablePanel extends JPanel
{
    JTable tableView;
    JScrollPane scrollpane;
    Dimension origin = new Dimension(0, 0);

    JCheckBox isColumnReorderingAllowedCheckBox;
    JCheckBox showHorizontalLinesCheckBox;
    JCheckBox showVerticalLinesCheckBox;

    JCheckBox isColumnSelectionAllowedCheckBox;
    JCheckBox isRowSelectionAllowedCheckBox;
    JCheckBox isRowAndColumnSelectionAllowedCheckBox;

    JLabel interCellSpacingLabel;
    JLabel rowHeightLabel;

    JSlider interCellSpacingSlider;
    JSlider rowHeightSlider;

    JComponent selectionModeButtons;
    JComponent resizeModeButtons;

    JPanel mainPanel;
    JPanel controlPanel;
    JScrollPane tableAggregate;
    public static void main(String[] args) {
       JFrame jf = new JFrame();
       jf.getContentPane().add(new TablePanel());
       jf.show();
    }
    public TablePanel() {
        super();
        
        setLayout(new FlowLayout());
        //mainPanel = this;

        // Create the table.
        tableAggregate = createTable();
        add(tableAggregate);
        //mainPanel.repaint();
    }


    private ImageIcon loadIcon(String name, String description) {
        String path = "images/ImageClub/food/" + name;
        return loadImageIcon(path, description);
    }
  public ImageIcon loadImageIcon(String filename, String description) {
      return new ImageIcon(filename, description);
  }


    public JScrollPane createTable() {

        // final
        final String[] names = {"Text Area", "Last Name", "Favorite
Color",
                                "Favorite Sport", "Favorite Number",
"Favorite Food", "First Name"};

        ImageIcon burger = loadIcon("burger.gif","burger");
        ImageIcon fries = loadIcon("fries.gif","fries");
        ImageIcon softdrink = loadIcon("softdrink.gif","soft drink");
        ImageIcon hotdog = loadIcon("hotdog.gif","hot dog");
        ImageIcon pizza = loadIcon("pizza.gif","pizza");
        ImageIcon icecream = loadIcon("icecream.gif","ice cream");
        ImageIcon pie = loadIcon("pie.gif","pie");
        ImageIcon cake = loadIcon("cake.gif","cake");
        ImageIcon donut = loadIcon("donut.gif","donut");
        ImageIcon treat = loadIcon("treat.gif","treat");
        ImageIcon grapes = loadIcon("grapes.gif","grapes");
        ImageIcon banana = loadIcon("banana.gif","banana");
        ImageIcon watermelon = loadIcon("watermelon.gif","watermelon");
        ImageIcon cantaloupe = loadIcon("cantaloupe.gif","cantaloupe");
        ImageIcon peach = loadIcon("peach.gif","peach");
        ImageIcon broccoli = loadIcon("broccoli.gif","broccoli");
        ImageIcon carrot = loadIcon("carrot.gif","carrot");
        ImageIcon peas = loadIcon("peas.gif","peas");
        ImageIcon corn = loadIcon("corn.gif","corn");
        ImageIcon radish = loadIcon("radish.gif","radish");
 
        
        // Create the dummy data (a few rows of names)
        final Object[][] data = {
          {"Mark", "Andrews", Color.red, "Baseball", new
Integer(2), broccoli, "Text2"},
          {"Tom", "Ball", Color.blue, "Football", new
Integer(99), burger, "Text3"},
          {"Alan", "Chung", Color.green, "Baseball", new
Integer(838), cake, "Text4"},
          {"Jeff", "Dinkins", Color.magenta, "Football", new
Integer(8), cantaloupe, "Text5"},
          {"Amy", "Fowler", Color.yellow, "Hockey", new
Integer(3), carrot, "Text6"},
          {"Brian", "Gerhold", Color.green, "Rugby", new
Integer(7), corn, "Text7"},
          {"James", "Gosling", Color.pink, "Tennis", new
Integer(21), donut, "Text8"},
          {"David", "Karlton", Color.red, "Baseball", new
Integer(1), fries, "Text9"},
          {"Dave", "Kloba", Color.yellow, "Football", new
Integer(14), grapes, "Text10"},
          {"Peter", "Korn", new Color(100, 100, 255), "Scuba
Diving", new Integer(12), broccoli, "Text11"},
          {"Dana", "Miller", Color.blue, "Ice Skating", new
Integer(8), banana, "Text12"},
          {"Phil", "Milne", Color.magenta, "Rugby", new
Integer(3), banana, "Text13"},
          {"Dave", "Moore", Color.green, "Tennis", new
Integer(88), peach, "Text14"},
          {"Hans", "Muller", Color.magenta, "Baseball", new
Integer(5), peas, "Text15"},
          {"Rick", "Levenson", Color.blue, "Football", new
Integer(2), pie, "Text16"},
          {"Tim", "Prinzing", Color.blue, "Baseball", new
Integer(22), pizza, "Text17"},
          {"Chester", "Rose", Color.black, "Hockey", new
Integer(0), radish, "Text18"},
          {"Chris", "Ryan", Color.black, "None", new Integer(6),
softdrink, "Text19"},
          {"Ray", "Ryan", Color.gray, "Football", new
Integer(77), treat, "Text20"},
        };

        // Create a model of the data.
        TableModel dataModel = new AbstractTableModel() {
            public int getColumnCount() { return names.length; }
            public int getRowCount() { return data.length;}
            public Object getValueAt(int row, int col)
            {
              //if (data[row][col] instanceof JTextArea)
                //return ((JTextArea)data[row][col]).getText();
              return data[row][col];
            }
            public String getColumnName(int column) {return
names[column];}
            public Class getColumnClass(int c)
            {
               if (c == 0)
                  return JTextArea.class;
               return getValueAt(0, c).getClass();
            }
            public boolean isCellEditable(int row, int col) {return
getColumnClass(col) == String.class; }
            public void setValueAt(Object aValue, int row, int column)
            {
              data[row][column] = aValue;
              //System.err.println(aValue);
              ////System.err.println("This is when selected " );
              //System.err.println(aValue);
            }
         };


        // Create the table
        tableView = new JTable(dataModel);

        // Show colors by rendering them in their own color.
        DefaultTableCellRenderer colorRenderer = new
DefaultTableCellRenderer() {
            public void setValue(Object value) {
                if (value instanceof Color) {
                    Color c = (Color)value;
                    setForeground(c);
                    setText(c.getRed() + ", " + c.getGreen() + ", " +
c.getBlue());
                }
            }

        };

        colorRenderer.setHorizontalAlignment(JLabel.RIGHT);
        tableView.getColumn("Favorite
Color").setCellRenderer(colorRenderer);

        tableView.getColumn("Text Area").setCellRenderer(new
TextAreaRenderer());

        tableView.setRowHeight(20);
        
        scrollpane = JTable.createScrollPaneForTable(tableView);
        //tableView.resizeAndRedraw();
        return scrollpane;
    }
}
class TextAreaRenderer extends JTextArea implements TableCellRenderer
{
    public TextAreaRenderer() { }

    public Component getTableCellRendererComponent(JTable table, Object
value,
        boolean isSelected, boolean hasFocus, int rowIndex, int column)
    {
        if (isSelected)
        {
          //System.err.println("This is when selected " + value);
        }
        this.setRows(3);
        //if (!((String)value).equals(this.getText()))
          //this.setText((String)value);
        setValue(value);
        return this;
    }
    public void setValue(Object value)
    {
        setText((value == null) ? "" : value.toString());
    }
}