How to change color of selected label from list of labels?

Question

My Problem is that I have a list of labels. RowHeaderRenderer is a row header renderer for Jtable which is rendering list items and (labels).getListTableHeader() is a method to get the list. When we click on the label this code is executed:
getListTableHeader().addMouseListener(new MouseAdapter()
public void mouseReleased(MouseEvent e)
if (e.getClickCount() >= 1)
int index = getListTableHeader().locationToIndex(e.getPoint());
try
if (((ae_AlertEventInfo)theAlerts.values().toArray()[index]).ackRequiredFlag)
AcknowledgeEvent ackEvent = new AcknowledgeEvent(
this, (ae_AlertEventInfo)theAlerts.values().toArray()[index]);
fireAcknowledgeEvent(ackEvent);
((HeaderListModel)listModel).setElementAt(ACK, index);
catch(Exception ex) {;}
Upon mouse click color of the label should be changed. For some period of time ie. Upto completion of fireAcknowledgeEvent(ackEvent);
This statement is calling this method:
public void handleAcknowledgeEvent(final AcknowledgeEvent event)
boolean ackOk = false;
int seqId = ((ae_AlertEventInfo)event.getAlertInfo()).sequenceId;
if (((ae_AlertEventInfo)event.getAlertInfo()).ackRequiredFlag)
try
// perform call to inform server about acknowledgement.
ackOk = serviceAdapter.acknowledge(seqId,
theLogicalPosition, theUserName);
catch(AdapterException aex)
Log.error(getClass(), "handleAcknowledgeEvent()",
"Error while calling serviceAdapter.acknowledge()", aex);
ExceptionHandler.handleException(aex);
else
// Acknowledge not required...
ackOk = true;
//theQueue.buttonAcknowledge.setEnabled(false);
final AlertEventQueue myQueue = theQueue;
if (ackOk)
Object popupObj = null;
synchronized (mutex)
if( hasBeenDismissed ) { return; }
// mark alert event as acknowledged (simply reset ack req flag)
ae_AlertEventInfo info;
Iterator i = theAlerts.values().iterator();
while (i.hasNext())
info = (ae_AlertEventInfo) i.next();
if (info.sequenceId == seqId)
// even if ack wasn't required, doesn't hurt to set it
// to false again. But it is important to prevent the
// audible from playing again.
info.ackRequiredFlag = false;
info.alreadyPlayed = true;
// internally uses the vector index so
// process the queue acknowledge update within
// the synchronize block.
final ae_AlertEventInfo myAlertEventInfo = event.getAlertInfo();
SwingUtilities.invokeLater(new Runnable()
public void run()
myQueue.acknowledge(myAlertEventInfo);
myQueue.updateAcknowledgeButtonState();
// here we should stop playing sound
// if it is playing for this alert.
int seqId1;
if (theTonePlayer != null)
seqId1 = theTonePlayer.getSequenceId();
if (seqId1 == seqId)
if (! theTonePlayer.isStopped())
theTonePlayer.stopPlaying();
theTonePlayer = null;
// get reference to popup to be dismissed...
// The dismiss must take place outside of
// the mutex... otherwise threads potentially
// hang (user hits "ok" and is waiting for the
// mutex which is currently held by processing
// for a "move to summary" transition message.
// if the "dismiss" call in the transition
// message were done within the mutex, it might
// hang on the dispose method because the popup
// is waiting for the mutex...
// So call popup.dismiss() outside the mutex
// in all cases.
if(event.getSource() instanceof AlertEventPopup)
popupObj = (AlertEventPopup)event.getSource();
else
popupObj = thePopups.get(event.getAlertInfo());
thePopups.remove(event.getAlertInfo());
SwingUtilities.invokeLater(new Runnable()
public void run()
// search vector elements to determine icon color in main frame
String color = getColor();
fireUpdateEvent(new UpdateEvent(this, blinking, color));
// Call dismiss outside of the mutex.
if (popupObj !=null)
if(popupObj instanceof AlertEventPopup)
((AlertEventPopup)popupObj).setModal(false);
((AlertEventPopup)popupObj).setVisible(false); // xyzzy
((AlertEventPopup)popupObj).dismiss();
else
// update feedback... ack failed
SwingUtilities.invokeLater(new Runnable()
public void run()
myQueue.setInformationMessage("Acknowledge failed to reach server... try again");
return;
Code for RowHeaderRenderer is:
class RowHeaderRenderer extends JLabel implements ListCellRenderer
JTable theTable = null;
ImageIcon image = null;
RowHeaderRenderer(JTable table)
image = new ImageIcon(AlertEventQueue.class.getResource("images" + "/" + "alert.gif"));
theTable = table;
JTableHeader header = table.getTableHeader();
setOpaque(true);
setHorizontalAlignment(LEFT);
setForeground(header.getForeground());
setBackground(header.getBackground());
setFont(header.getFont());
public Component getListCellRendererComponent( JList list, Object value,
int index, boolean isSelected, boolean cellHasFocus)
int level = 0;
try
level = Integer.parseInt(value.toString());
catch(Exception e)
level = 0;
if (((ae_AlertEventInfo)theAlerts.values().toArray()[index]).ackRequiredFlag)
setBorder(UIManager.getBorder("TableHeader.cellBorder"));
this.setHorizontalAlignment(JLabel.CENTER);
this.setVerticalAlignment(JLabel.CENTER);
setIcon(image);
else
setBorder(BorderFactory.createLineBorder(Color.gray));
setText("");
setIcon(null);
return this;
I tried but when i am clicking a particular label, the color of all labels in the List is being changed. So can you please assist me in changing color of only the label that is selected and the color must disappear after completion of Upto completion of fireAcknowledgeEvent(ackEvent);

Answer 1

im a bit confused with the post so hopefully this will help you, if not then let me know.
I think the problem is that in your renderer your saying
setBackground(header.getBackground());which is setting the backgound of the renderer rather than the selected item, please see an example below, I created a very simple program where it adds JLabels to a list and the renderer changes the colour of the selected item, please note the isSelected boolean.
Object "value" is the currentObject its rendering, obviously you may need to test if its a JLabel before casting it but for this example I kept it simple.
populating the list
public void populateList(){
        DefaultListModel model = new DefaultListModel();
        for (int i=0;i<10;i++){
            JLabel newLabel = new JLabel(String.valueOf(i));
            newLabel.setOpaque(true);
            model.addElement(newLabel);           
        this.jListExample.setModel(model);
        this.jListExample.setCellRenderer(new RowHeaderRenderer());
    }the renderer
class RowHeaderRenderer extends JLabel implements ListCellRenderer
    JTable theTable = null;
    public Component getListCellRendererComponent(JList list, Object value,
                                                  int index, boolean isSelected, boolean cellHasFocus){
        JLabel aLabel = (JLabel)value;
        if (isSelected){
            aLabel.setBackground(Color.RED);
        }else{
            aLabel.setBackground(Color.GRAY);
        return aLabel;       
}