JTable listener problem, plz. help code included

Question

hi,
I need help in this JTable. If you run the following code you'll see when you double click in any cell scrollbars will appear if the text is too large for the JTextArea. What I want is when any cell is selected and if the text is too large to fit in the JTextArea I want the scrollbars to appear then. And if I double click in any cell I want some other action to take place. Here is the example code that I got from net and I am trying to play arround with this code. Please run the following code and see what I mean:
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.event.*;
import java.util.*;
import javax.swing.table.*;
import javax.swing.border.*;
public class MyMultiRowTableTest extends JFrame
public MyMultiRowTableTest()
addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent we)
System.exit(0);
getContentPane().setLayout(new BorderLayout());
getContentPane().add(initComponents(), BorderLayout.CENTER);
protected Container initComponents()
JPanel mainPanel = new JPanel(new BorderLayout());
Vector vRows = new Vector();
Vector vColumns = new Vector();
vColumns.add("Column1");
vColumns.add("Column2");
for (int i=0; i<20; i++)
Vector vRow = new Vector(2);
vRow.add(""+(i+1)+". abcdefghijklmnopqrstuvwxyzabcdefghijk" +
"lmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmno" +
"pqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstu" +
"wxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdef" +
"ghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrs"+
"tuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghi" +
"jklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"+
"abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrs"+
"tuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz");
vRow.add("asldfjasldfjal�dfjal�jdfal");
vRows.add(vRow);
JTable myTable = new JTable(vRows, vColumns);
for (int i=0; i<myTable.getColumnCount(); i++)
TableColumn tc = myTable.getColumn(myTable.getColumnName(i));
if (tc!=null)
tc.setCellRenderer(new MultiLineCellRenderer());
tc.setCellEditor(new MultiLineCellEditor());
myTable.setRowHeight(80);
mainPanel.add(new JScrollPane(myTable));
return mainPanel;
public static void main(String[] args)
JFrame frame = new MyMultiRowTableTest();
frame.setSize(800,600);
frame.setLocation(200,200);
frame.setVisible(true);
}//end of the class MyMultiRowTableTest
class MultiLineCellEditor extends DefaultCellEditor
protected JTextArea myEditingComponent;
public MultiLineCellEditor()
super(new JTextField());
myEditingComponent = new JTextArea();
myEditingComponent.setLineWrap(true);
myEditingComponent.setWrapStyleWord(true);
myEditingComponent.setOpaque(true);
myEditingComponent.addKeyListener(new KeyAdapter()
public void keyPressed(KeyEvent ke)
if ((ke.getKeyCode()==ke.VK_ENTER) && (ke.getModifiers() == ke.CTRL_MASK))
stopCellEditing();
public Object getCellEditorValue()
return myEditingComponent.getText();
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected,
int row, int column)
Component result = super.getTableCellEditorComponent(table,
value, isSelected, row, column);
myEditingComponent.setFont(table.getFont());
myEditingComponent.setText(""+value);
if (value instanceof String)
result = new JScrollPane(myEditingComponent);
return result ;
}//end of the class MultiLineCellEditor
class MultiLineCellRenderer extends JTextArea implements TableCellRenderer
protected final static Border emptyBorder = BorderFactory.createEmptyBorder(1,2,1,2);
protected final static Border focusBorder = UIManager.getBorder("Table.focusCellHighlightBorder");
public MultiLineCellRenderer()
setLineWrap(true);
setWrapStyleWord(true);
setOpaque(true);
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected,
boolean hasFocus, int row, int column)
if (isSelected)
setForeground(table.getSelectionForeground());
setBackground(table.getSelectionBackground());
else
setForeground(table.getForeground());
setBackground(table.getBackground());
setFont(table.getFont());
if (hasFocus)
setBorder(focusBorder);
if (table.isCellEditable(row, column))
setForeground( UIManager.getColor("Table.focusCellForeground") );
setBackground( UIManager.getColor("Table.focusCellBackground") );
else
setBorder(emptyBorder);
if(value==null)
myEditingComponent.setText("");
return new JScrollPane
(myEditingComponent);
setText((value == null) ? "" : value.toString());
return this;
}//end of the class MultiLineCellRenderer
If you see when you double click in the first column the scrollbars will appear as the text is too large. But what I need is that when the cell is selected the scrollbars should appear and when I doubleclick in the cell I want some other action to take place. Please help I really don't understand how this cellrenderer and celleditor works. Any help is really appreciated. And thank you in advance.

Answer 1

hi friend
i tried to solve your problem , but i couldn't clear myself with program logic u used. but your problem can be solved by trying with the following lines.you need to explore the right place in your logic.
int v=ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS;
int h=ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS;
if (value instanceof String)
result = new JScrollPane(myEditingComponent,v,h);
return result ;
in the meanwhile i will try with your code as soon i will get time.
reply me back if it solves the problem
bye