Name: jk109818 Date: 08/18/2003


FULL PRODUCT VERSION :
java version "1.4.1_01"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1_01-b01)
Java HotSpot(TM) Client VM (build 1.4.1_01-b01, mixed mode)

FULL OS VERSION :
Microsoft Windows 2000 [Version 5.00.2195]

A DESCRIPTION OF THE PROBLEM :
When instantiating a JList and calling its setPreferredSize method, then placing it into a JScrollPane, it does not redraw anthing that is not in the viewport of the JScrollPane.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the following program and look at the row headers as you scroll. Then comment out the setPreferredSize method.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Redrawing should be normal but isn't.
ACTUAL -
The column is not redrawn properly.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;


/**
 * @version 1.0 11/09/98
 */
 
class RowHeaderRenderer extends JLabel implements ListCellRenderer {
  
  RowHeaderRenderer(JTable table) {
    JTableHeader header = table.getTableHeader();
    setOpaque(true);
    setBorder(UIManager.getBorder("TableHeader.cellBorder"));
    setHorizontalAlignment(CENTER);
    setForeground(header.getForeground());
    setBackground(header.getBackground());
    setFont(header.getFont());
  }
  
  public Component getListCellRendererComponent( JList list,
         Object value, int index, boolean isSelected, boolean cellHasFocus) {
    setText((value == null) ? "" : value.toString());
    return this;
  }
}

public class RowHeaderExample extends JFrame {

  public RowHeaderExample() {
    super( "Row Header Example" );
    setSize( 300, 150 );
        
    ListModel lm = new AbstractListModel() {
      String headers[] = {"a", "b", "c", "d", "e", "f", "g", "h", "i"};
      public int getSize() { return headers.length; }
      public Object getElementAt(int index) {
        return headers[index];
      }
    };

    DefaultTableModel dm = new DefaultTableModel(lm.getSize(),10);
    JTable table = new JTable( dm );
    table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
    
    JList rowHeader = new JList(lm);
    rowHeader.setFixedCellWidth(50);
// rowHeader.setPreferredSize(new Dimension(50, 30));

    rowHeader.setFixedCellHeight(table.getRowHeight()
                               + table.getRowMargin());
// + table.getIntercellSpacing().height);
    rowHeader.setCellRenderer(new RowHeaderRenderer(table));

    JScrollPane scroll = new JScrollPane( table );
    scroll.setRowHeaderView(rowHeader);
    getContentPane().add(scroll, BorderLayout.CENTER);
  }

  public static void main(String[] args) {
    RowHeaderExample frame = new RowHeaderExample();
    frame.addWindowListener( new WindowAdapter() {
      public void windowClosing( WindowEvent e ) {
System.exit(0);
      }
    });
    frame.setVisible(true);
  }
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Don't try to call this but if you don't you're faced with a column that does not allow for any margin space around the textual content within which looks horrible. The other alternative is to use a fixed size. Both alternatives do not support a realistic expectation when attempting to create a spreadsheet like program.
(Incident Review ID: 199352)
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