Re: Controlling the scroll pane in JComboBox

Wed, 11 Jun 2008 12:25:06 -0700 (PDT)
Use the setUI() method
and an extended BasicComboBoxUI class.

also import javax.swing.plaf.basic.*;


Chinthaka Weerasinghe - Your friendly java tutor

package pmg;

import java.awt.*;

import javax.swing.*;
import javax.swing.event.*;

import java.awt.event.*;
import java.util.ArrayList;

import javax.swing.plaf.basic.*;

public class ChoiceGui extends JComboBox {
 private ArrayList<String> myList = new ArrayList<String>();
 private boolean mySettingItem = false;
 private boolean myRespondingToChangedQuery = false;

 public static void main(String[] args) {

  ArrayList<String> choices = new ArrayList<String>();
  choices.addAll(java.util.Arrays.asList("Hello;Hello, World!;A very
looooooooooooooong String;Very Slow;Bad dog, bad!".split(";")));

  JFrame frame = new JFrame("Choice");
  frame.getContentPane().add(new ChoiceGui(choices));

 public ChoiceGui(ArrayList<String> choices) {

  myList = choices;

  setEditor(new Editor());
  setRenderer(new Renderer3());
  setBackground(Color.getHSBColor(1f/6, .2f, 1f));

  this.setPreferredSize(new Dimension(150, 22));

  for (int s = 0; s < myList.size(); s++)


  this.setEditable(true); // This is when the first setItem() is
  setUI(new myComboUI());

 public class myComboUI extends BasicComboBoxUI{
  protected ComboPopup createPopup(){
   BasicComboPopup popup = new BasicComboPopup(comboBox){
    protected JScrollPane createScroller() {
     return new JScrollPane( list,
       ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED );
    }// end of method createScroller
   return popup;
  }// end of method createPopup
 }// end of inner class myComboUI

 public class Editor implements ComboBoxEditor {
  private JTextField myTextField = new JTextField();

  public void addActionListener(ActionListener l)
{ myTextField.addActionListener(l); }
  public void removeActionListener(ActionListener l) { }
  public void setItem(Object item) {
   if (myRespondingToChangedQuery)

   System.out.println("setItem called!!!");
   mySettingItem = true;
   if (item != null) {
   else if (!myRespondingToChangedQuery) // The value of SuperChoice
    // for a different reason, so the
    // query must be reset.

   mySettingItem = false;
  public void selectAll() { myTextField.selectAll(); }
  public Object getItem() { return null; }
  public Component getEditorComponent() { return myTextField; }

  public Editor() {
DocumentListener() {
    public void dodo() {

     javax.swing.SwingUtilities.invokeLater(new Runnable() {
      public void run() {
       myRespondingToChangedQuery = true;

       String q =
       for (int i = 0; i < myList.size(); i++)
        if (myList.get(i).toUpperCase().contains(q.toUpperCase()))


       myRespondingToChangedQuery = false;


    public void changedUpdate(DocumentEvent e) {
     if (mySettingItem)
    public void insertUpdate(DocumentEvent e) {
     if (mySettingItem)
    public void removeUpdate(DocumentEvent e) {
     if (mySettingItem)


 class Renderer3 implements ListCellRenderer {
  JPanel panel = new JPanel();
  JLabel label = new JLabel();
  JLabel label1 = new JLabel();
  JLabel label2 = new JLabel();
  JLabel label3 = new JLabel();

  public Renderer3() {
   panel.setLayout(new BoxLayout(panel, BoxLayout.X_AXIS));


   Font font = label1.getFont();
   label.setFont(new Font(font.getName(),
   label1.setFont(new Font(font.getName(),
   label2.setFont(new Font(font.getName(), Font.BOLD,font.getSize()));
   label3.setFont(new Font(font.getName(),
   panel.setBackground(Color.getHSBColor(1f/6, .2f, 1f));

  public Component getListCellRendererComponent(JList list, Object
value, int index, boolean isSelected, boolean cellHasFocus) {
   String str = (value!=null)?value.toString():"null";
   String q =
   if (q.length() != 0 && str.toUpperCase().indexOf(q.toUpperCase()) !
= -1) {
    int start = str.toUpperCase().indexOf(q.toUpperCase());
    label1.setText(str.substring(0, start));
    label2.setText(str.substring(start, start + q.length()));
    label3.setText(str.substring(start + q.length()));

    return panel;
   else {
    Font font = label.getFont();
    label.setFont(new Font("Dialog", Font.PLAIN, 12));
    label.setText(" " + str);
    return label;

On Jun 10, 9:26 am, Aaron Fude <> wrote:


I'm having all sorts of problems controlling dimensions in Swing with
LayoutManagers. (Is there an article somewhere about this?)

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