JScrollPane inside a JTable cell

[Rames Raja]

Hi all,
I am in an urgent need to implement a JTable where each cells will contain multiline text. When text content exceeds my cell size I want a JScrollbar to appear so that I can see the entire content inside my table cell.
I desperately need help on this, please help me out.
many thanks in advance.
Ramesh

[Chantal Ackermann]

hi,
extend JPanel or JScrollPane (or some custom component) and implement the TableCellRenderer (see the source of DefaultTableCellRenderer for performance issues!)
you have to set the row height of the JTable appropriately or it will be to small.
moreover, the mouse events have to be transmitted to the scrollpane:
you have to write a custom TableCellEditor for this:

public class CustomPanelCellEditor implements TableCellEditor,Serializable
{
public CustomPanelCellEditor()
{
customPanel = new CustomPanel();
}
public Component getComponent()
{
return customPanel;
}
public Object getCellEditorValue()
{
return value;
}
public boolean isCellEditable(EventObject anEvent)
{
return true;
}
public boolean shouldSelectCell(EventObject anEvent)
{
if (sentencePanel != null)
{
if (anEvent instanceof MouseEvent)
{
MouseEvent me = (MouseEvent) anEvent;
int id = me.getID();
int x = me.getX();
int y = me.getY();
Component source = (Component)me.getSource();
/*if (id == MouseEvent.MOUSE_PRESSED || id == MouseEvent.MOUSE_DRAGGED)
{
Component dispatchComponent = SwingUtilities.getDeepestComponentAt(source, x, y);
MouseEvent e2 = new MouseEvent(dispatchComponent, MouseEvent.MOUSE_RELEASED,
        me.getWhen() + 100000, me.getModifiers(), x, y, me.getClickCount(),
        me.isPopupTrigger());
dispatchComponent.dispatchEvent(e2);
MouseEvent e2 = new MouseEvent(dispatchComponent, MouseEvent.MOUSE_CLICKED,
        new Date().getTime() + 100000,
        me.getModifiers(), x, y, 1, me.isPopupTrigger());
dispatchComponent.dispatchEvent(e2);
}*/
Component dispatchComponent = SwingUtilities.getDeepestComponentAt(source, x, y);
MouseEvent e2 = new MouseEvent(dispatchComponent, id,
        me.getWhen() + 100000, me.getModifiers(), x, y, me.getClickCount(),
        me.isPopupTrigger());
dispatchComponent.dispatchEvent(e2);
}
}
return false;
}
public boolean stopCellEditing()
{
fireEditingStopped();
return true;
}
public void cancelCellEditing()
{
fireEditingCanceled();
}
public void addCellEditorListener(CellEditorListener l)
{
listenerList.add(CellEditorListener.class, l);
}
public void removeCellEditorListener(CellEditorListener l)
{
listenerList.remove(CellEditorListener.class, l);
}
protected void fireEditingStopped()
{
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
//Process the listeners last to first, notifying those that are interested in this event
for (int i = listeners.length - 2; i >= 0; i -= 2)
{
if (listeners[i] == CellEditorListener.class)
{
// lazily create the event:
if (changeEvent == null)
{
changeEvent = new ChangeEvent(this);
((CellEditorListener) listeners[i + 1]).editingStopped(changeEvent);
}
}
}
}
protected void fireEditingCanceled()
{
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
//Process the listeners last to first, notifying those that are interested in this event
for (int i = listeners.length - 2; i >= 0; i -= 2)
{
if (listeners[i] == CellEditorListener.class)
{
// lazily create the event:
if (changeEvent == null)
{
changeEvent = new ChangeEvent(this);
((CellEditorListener) listeners[i + 1]).editingCanceled(changeEvent);
}
}
}
}
// implements javax.swing.table.TableCellEditor
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected,
        int row, int column)
{
CustomData data = (CustomData) value;
if (data != null)
{
customPanel.setData(data);
}
container = table;
this.value = value;
return customPanel;
}
protected EventListenerList listenerList = new EventListenerList();
transient protected ChangeEvent changeEvent = null;
protected CustomPanel customPanel = null;
protected JComponent container = null;
protected Object value = null;
}

see this page for a more general sample:
http://www.codeguru.com/java/articles/162.shtml
Chantal