JComboBox checkmark question

Question

When using a JComboBox the selected item is indicated in the dropdown list with a checkmark. I created a really simple renderer that changes the color of the text based on an attribute of the Object:
public class SupportedObjectComboBoxRenderer extends JLabel implements ListCellRenderer {
  public SupportedObjectComboBoxRenderer() {
  public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
    SupportedObject so = (SupportedObject)value;
    this.setForeground(so.isActive() ? Color.BLACK : Color.GRAY);
    this.setText(so.getName());
    return this;
}The checkmark is no longer displayed. I believe I need to render that myself (in the JLabel). Is that default checkmark icon accessible so that I can load it as a resource? Or is there something else I should be doing to show it?

Answer 1

Is there a way you can change the text color of a JComboBox item without
otherwise disrupting the look and feel?don't know if this will work for you, but worth a try
import java.awt.*;
import javax.swing.*;
class Testing extends JFrame
  JComboBox cbo = new JComboBox(new String[]{"London","Madrid","New York","Rome","Sydney","Washington"});
  public Testing()
    setSize(150,75);
    setLocation(400,300);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    cbo.setRenderer(new MyRenderer());
    JPanel jp = new JPanel();
    jp.add(cbo);
    getContentPane().add(jp);
  public static void main(String args[]){new Testing().setVisible(true);}
class MyRenderer extends DefaultListCellRenderer
  public Component getListCellRendererComponent(JList list,Object value,
                      int index,boolean isSelected,boolean cellHasFocus)
    JLabel lbl = (JLabel)super.getListCellRendererComponent(list,value,index,isSelected,cellHasFocus);
    lbl.setForeground(index%2==0? Color.RED:Color.BLUE);
    return lbl;
}