I have tried a few different ways to to highlight the text in a jcombobox when it receives focus but none have work. Any have a code example that could help?

Some examples I have tried:

private void fromComboBoxFocusFocusGained(FocusEvent event) {
  JTextField field = (JTextField)fromComboBox.getEditor().getEditorComponent();
  field.selectAll();
        
}
private void fromComboBoxFocusFocusGained(FocusEvent event) {
  fromComboBox.getEditor().selectAll();
}

All you need to is monitor mouse clicks in/over the component and mark starting caret and ending caret. Magic done

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

public class JTextFieldDemo {

  JLabel jlabAll;
  JLabel jlabSelected;

  JTextField jtf;

  JButton jbtnCut;
  JButton jbtnPaste;

  public JTextFieldDemo(){
    JFrame jfrm = new JFrame("Use JTextField");

    jfrm.getContentPane().setLayout(new FlowLayout());
    jfrm.setSize(200, 150);
    jfrm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    jlabAll = new JLabel("All text: ");
    jlabSelected = new JLabel("Selected text: ");

    jtf = new JTextField("This is a test.", 15);
    jtf.addActionListener(new ActionListener(){
       public void actionPerformed(ActionEvent le){
         jlabAll.setText("All text: " + jtf.getText());
         jlabSelected.setText("Selected text: "+ jtf.getSelectedText());
       }
    });

    jbtnCut = new JButton("Cut");
    jbtnPaste = new JButton("Paste");

    jbtnCut.addActionListener(new ActionListener(){
      public void actionPerformed(ActionEvent le){
        jtf.cut();
        jlabAll.setText("All text: "+ jtf.getText());
        jlabSelected.setText("Selected text: "+ jtf.getSelectedText());
      }
    });

    jbtnPaste.addActionListener(new ActionListener(){
      public void actionPerformed(ActionEvent le){
        jtf.paste();
      }
    });

    jtf.addCaretListener(new CaretListener(){
      public void caretUpdate(CaretEvent ce){
        jlabAll.setText("All text: " + jtf.getText());
        jlabSelected.setText("Selected text: "+ jtf.getSelectedText());
      }
    });

    jfrm.getContentPane().add(jtf);
    jfrm.getContentPane().add(jbtnCut);
    jfrm.getContentPane().add(jbtnPaste);
    jfrm.getContentPane().add(jlabAll);
    jfrm.getContentPane().add(jlabSelected);

    jtf.setCaretPosition(5);
    jtf.moveCaretPosition(7);

    jfrm.setVisible(true);
  }

  public static void main(String[] args){
    SwingUtilities.invokeLater(new Runnable(){
      public void run(){
        new JTextFieldDemo();
      }
    });
  }
}

Code as can be found in Swing - A Beginner's Guide by Herbert Schildt pg.262-264

thanks I will try this out and let you know the results.

Ahhh sorry this one is wrong. Above example is for text field not combo box.(bad idea trying to reply at midnight when sleepy)
I will look into it again once I get home, sorry again

OK, please let me know what you find. Also, to let you know, the only input device we have for the application is a scan gun. There is no mouse or keyboard. So when focus is on the combobox i just need the text highlighted.

Thanks!

I figured out my problem. The below code does work, I just didn't have it in all the necessary places. Thanks for your help.

JTextField field = (JTextField)fromComboBox.getEditor().getEditorComponent();
field.selectAll();