Combo box menu calculation of popup size ignores horizontal scrollbar

I have a JComboBox that I've setMaximumRowCount(20). However, sometimes the combo box has as few as 2 or 3 items in it. In those cases as you probably know, Swing automatically calculates how tall the popup should be, in this case 2 rows tall.
However, this calculation ignores the horizontal scrollbar, which basically occupies a "row" itself. This means that if I have combo box with 2 items, the displayed popup will contain the first item, a horizontal scrollbar, and a vertical scrollbar (for scrolling down to the item that the horizontal scrollbar hides) . Is this a bug in Java? If so, are there any workarounds to this?
I've looked in the bug report section using the terms "combobox horizontal scrollbar popup" and couldn't find anything
thanks

the very simple strategy to do is to call removeAllItems() method for the 2nd combox box and then insert the contents. this is because the validate() method is not repeatedly called and so the contents are not updated immediately.

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Combo box - setting the pop up size

Howdy everyone,
I have a combo box with large names inside it and has limited space on the screen. When I click the combo I want the pop up to enlarge in width so you can see the full names.
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Hi,
This was a bug and is fixed in 30984.
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Combo box popup width adjusting no longer work in 1.0.6_26-b03

Previously, I was able to adjusting combo box popup's width, by referring to the technique described in [http://tips4java.wordpress.com/2010/11/28/combo-box-popup/|http://tips4java.wordpress.com/2010/11/28/combo-box-popup/]. During that time, I was using 1.0.6_24-b07.
However, after I update my Java runtime to 1.0.6_26-b03, things broke.
Here is the screen shoot.
[Workable screen shoot|http://i.imgur.com/0elo7.png]
[Not workable screen shoot|http://i.imgur.com/BeKMy.png]
Here is the code snippet to demonstrate this problem.
* To change this template, choose Tools | Templates
* and open the template in the editor.
* NewJFrame.java
* Created on Aug 9, 2011, 4:13:41 AM
package experiment;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import javax.swing.JComboBox;
import javax.swing.JList;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
import javax.swing.event.PopupMenuEvent;
import javax.swing.event.PopupMenuListener;
import javax.swing.plaf.basic.BasicComboPopup;
* @author yccheok
public class NewJFrame extends javax.swing.JFrame {
     * Adjust popup for combo box, so that horizontal scrollbar will not display.
     * Resize JComboBox dropdown doesn't work without customized ListCellRenderer
     * http://www.camick.com/java/source/BoundsPopupMenuListener.java
     * @param comboBox The combo box
    public static void adjustPopupWidth(JComboBox comboBox) {
        if (comboBox.getItemCount() == 0) return;
        Object comp = comboBox.getAccessibleContext().getAccessibleChild(0);
        if (!(comp instanceof BasicComboPopup)) {
            return;
        BasicComboPopup popup = (BasicComboPopup)comp;
        JList list = popup.getList();
        JScrollPane scrollPane = getScrollPane(popup);
        // Just to be paranoid enough.
        if (list == null || scrollPane == null) {
            return;
        // Determine the maximimum width to use:
        // a) determine the popup preferred width
        // b) ensure width is not less than the scroll pane width
        int popupWidth = list.getPreferredSize().width
                        + 5 // make sure horizontal scrollbar doesn't appear
                        + getScrollBarWidth(popup, scrollPane);
        Dimension scrollPaneSize = scrollPane.getPreferredSize();
        popupWidth = Math.max(popupWidth, scrollPaneSize.width);
        // Adjust the width
        scrollPaneSize.width = popupWidth;
        scrollPane.setPreferredSize(scrollPaneSize);
        scrollPane.setMaximumSize(scrollPaneSize);
     * I can't find any property on the scrollBar to determine if it will be
     * displayed or not so use brute force to determine this.
    private static int getScrollBarWidth(BasicComboPopup popup, JScrollPane scrollPane) {
        int scrollBarWidth = 0;
        Component component = popup.getInvoker();
        if (component instanceof JComboBox) {
            JComboBox comboBox = (JComboBox)component;
            if (comboBox.getItemCount() > comboBox.getMaximumRowCount()) {
                JScrollBar vertical = scrollPane.getVerticalScrollBar();
                scrollBarWidth = vertical.getPreferredSize().width;
        return scrollBarWidth;
     * Get the scroll pane used by the popup so its bounds can be adjusted
    private static JScrollPane getScrollPane(BasicComboPopup popup) {
        JList list = popup.getList();
        Container c = SwingUtilities.getAncestorOfClass(JScrollPane.class, list);
        return (JScrollPane)c;
    /** Creates new form NewJFrame */
    public NewJFrame() {
        initComponents();
        this.jComboBox1.addPopupMenuListener(getPopupMenuListener());
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {
        jComboBox1 = new javax.swing.JComboBox();
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        jComboBox1.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "Item 1", "Item 2", "Item 3", "Item 4", "This is a very long text. This is a very long text" }));
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(82, 82, 82)
                .addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, 76, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(242, Short.MAX_VALUE))
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(34, 34, 34)
                .addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(246, Short.MAX_VALUE))
        pack();
    }// </editor-fold>
    * @param args the command line arguments
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new NewJFrame().setVisible(true);
    private PopupMenuListener getPopupMenuListener() {
        return new PopupMenuListener() {
            @Override
            public void popupMenuWillBecomeVisible(PopupMenuEvent e) {
                // We will have a much wider drop down list.
                adjustPopupWidth(jComboBox1);
            @Override
            public void popupMenuWillBecomeInvisible(PopupMenuEvent e) {
            @Override
            public void popupMenuCanceled(PopupMenuEvent e) {
    // Variables declaration - do not modify
    private javax.swing.JComboBox jComboBox1;
    // End of variables declaration
}

I had came across another workaround as stated here.
[http://www.jroller.com/santhosh/entry/make_jcombobox_popup_wide_enough|http://www.jroller.com/santhosh/entry/make_jcombobox_popup_wide_enough]
The popup's is having enough width to show all items. However, it is not perfect still, as the width is little too much. I still can see some extra space at the tailing of the list.
The workaround is as follow.
import javax.swing.*;
import java.awt.*;
import java.util.Vector;
// got this workaround from the following bug:
//      http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4618607
public class WideComboBox extends JComboBox{
    public WideComboBox() {
    public WideComboBox(final Object items[]){
        super(items);
    public WideComboBox(Vector items) {
        super(items);
    public WideComboBox(ComboBoxModel aModel) {
        super(aModel);
    private boolean layingOut = false;
    public void doLayout(){
        try{
            layingOut = true;
            super.doLayout();
        }finally{
            layingOut = false;
    public Dimension getSize(){
        Dimension dim = super.getSize();
        if(!layingOut)
            dim.width = Math.max(dim.width, getPreferredSize().width);
        return dim;
}

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I'm trying to make a custom calculation Javascript for a combo box and can't figure out the calculation.
There are a few variables at play. I would like to incorporate a sliding scale for a student's high school gpa that looks like this:
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2.00                          1010                            86
2.025                        1000                            85
Students GPA=Combo Box1
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Combo Box2=(If GPA=2.028, event value=1000/85)
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Have you accounted for the case of no selection made?
Have you looked at what the type of the value is from the combo box?
Do you understand the 2 different ways that the "+" operator works with JavaScript?
Can you provide any JavaScript console messages?
Can you link to a sample form?

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DropDownMenuInABox.vi ‏18 KB
DropDownMenuInABox_FP.PNG ‏18 KB
DropDownMenuInABox_BD.PNG ‏36 KB

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JTextField textField = new JTextField(15)
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I thought I could use a combo box and split the strings up so I could have some type of drop down menu showing the informationIf you want to proceed with this approach then check out this posting:
http://forum.java.sun.com/thread.jspa?forumID=57&threadID=637581

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Edited by: BoBear2681 on Nov 6, 2010 10:40 AM

Hi,
On February 2 2010 I filed a bug report that got an internal review ID of 1709860, which is NOT
visible on the Sun Developer Network (SDN).
I never heard of it again.
I added a demo of the problem (executable in the JDK development test system, but also stand alone) . For me the test fails on all versions of JDK 7 that I tested. It runs fine on JDK 6.
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import java.awt.event.*;
import javax.swing.*;
import sun.awt.SunToolkit;
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    private static Dimension[] parentSizes;
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     moveAndClickCenter(menus[0]);
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          .getMenuComponent(menus[menus.length - 1]
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         System.out.print("old: " + parentSizes[index] + ", new: "
              + currentSize);
         if (!parentSizes[index].equals(currentSize)) {
          bug = true;
          System.out.println(" ERROR");
         } else {
          System.out.println();
     if (bug) {
         throw new RuntimeException(
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     return menus[index].getMenuComponent(0).getParent().getSize();
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          // The L&F defines the drop down policy.
          UIManager.LookAndFeelInfo[] infos = UIManager
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          for (final UIManager.LookAndFeelInfo info : infos) {
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               if (!UIManager.getLookAndFeel().getName().equals(
                    info.getName())) {
                   try {
                    UIManager.setLookAndFeel(info.getClassName());
                    System.out
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                    e.printStackTrace();
               } else {
                   System.out
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Combo box menu calculation of popup size ignores horizontal scrollbar

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