Can't select when JList populated by LOV

Question

I'm at a loss here...
JDev 10.1.2.1 (1913)
I'm creating a simple Swing Shuttle panel. I want standard action, i.e. when the 'shuttle' button is pressed, the selected items in JList1 move to JList2.
I first created this with JList1 bound to a VO. I quickly realized that I couldn't remove elements from the list without removing the appropriate rows from VO...tried to do that but ran into errors.
Ok, so i figured I'd create a programmatic VO and followed the documentation to populate this with a LOV from the db-backed VO attribute I want.
The problem is that all list values are grayed out and un-selectable
Steps:
1 - Create DB-backed VO and programmatic-backed VO with same attributes (I created these using the Ename field from Scott.EMP)
2 - Create JPanel
3 - Find the programmatic-backed VO on the Data Control palette
4 - Expand to find the attribute I want to show in my JList; select "Drag and drop as List"; drag onto my panel
5 - Open the List binding editor from the Structure window
6 - On the LOV Update attributes tab I select the DB-backed VO as the source and the programmatic VO as the target
7 - On the LOV display attributes tab I shuttle over the attribute I want to display (Ename)
I tried the three different selectionModes...I compared the properties of the VO-backed JList with the LOV-backed list and can't find a difference. I fooled around with the "Updatable" settings in the VO...
Any ideas why this doesn't work as i expect?
thanks
John

Answer 1

I'm not sure that there is anything in the ADF Bindings to help you here. What we have done is to programatically execute the query and add each Row to the JList. You will need a custom renderer to the JList so that the list knows which attribute from the Row to display. Then when you shuttle the row over, you just remove it from the first JList and add it to the 2nd JList. It is also very easy to create a generic ListCellRenderer that knows how to display Row objects. Here is one that we use:
import java.awt.Component;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.ListCellRenderer;
import oracle.jbo.Row;
public class ADFRowListCellRenderer extends JLabel implements ListCellRenderer {
  private String attributeName = null;
  public ADFRowListCellRenderer(String attributeToDisplay) {
    this.attributeName = attributeToDisplay;   
  public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {  
    Row row = (Row) value;
    String fieldValue = null;
    if( row != null ) {
      Object objectValue = row.getAttribute(attributeName);  
      if( objectValue != null ) {
        fieldValue = objectValue.toString();  
    setText(fieldValue == null ? "" : fieldValue);
    setOpaque(true);
    setBackground(isSelected
           ? list.getSelectionBackground()
           : list.getBackground());
    setForeground(isSelected
           ? list.getSelectionForeground()
           : list.getForeground());    
    return this;
}One thing to remember is that a Row instance has some internal id assigned to it, so if you re-execute the query, your list's Row references will be invalid. If you have to re-execute the query, then you will need to clear the JLists and reload the Rows.
Hope this helps
Erik