AutoResize JTabbedPane

Hello
I have some problems using JTabbedPane. I insert a JTabbedPane into a JPanel with a BorderLayout manager. after this, i add to the JTabbedPane JPanels that contains JScrollpane with a JTextArea.
The problem comes when i enter text in one JTextArea, if i select an other tab, All the JTabbedPane is resized to display the JTextArea without vertical Scroll.
Where does the resize event come from ? Is there a solution to avoid this !
Thanks for helping me.
Eusebe

yes....
i did add this listener....but initially when i set the selectedTabIndex to 0
it wasn't firing the event ......
so i added
pane.setSelectedIndex(-1);
pane.setSelectedIndex(0);
and it started working fine.

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Here is a sample program that seems to work:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;
public class TestInternalFrame extends JFrame
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          setContentPane( desktop );
          JInternalFrame internal = new JInternalFrame( "Internal Frame" );
          desktop.add( internal );
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How do I left justify the text in the tabs of a JTabbedPane.

In 1.3.1 this used to work by supplying an HTML string with <div align="left"> but when I run with 1.4.1 this is now broken and I get center justification.
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Philip

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Here is a solution:
You can override the TabbedPaneUI class and ajust the "layoutLabel()" method. Here is the code..
//Your code using the tabbedPane
JTabbedPane tp = new JTabbedPane();
tp.setUI(new LeftTabbedPaneUI());
//File containing the overrided TabbedPaneUI
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.text.View;
class LeftTabbedPaneUI extends javax.swing.plaf.metal.MetalTabbedPaneUI {
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        //way to do this so you can delete this function in your
        //implementation
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        textRect.x = textRect.y = iconRect.x = iconRect.y = 0;
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                                           rec,
                                           iconRect,
                                           textRect,
                                           textIconGap);
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     int yNudge = getTabLabelShiftY(tabPlacement, tabIndex, isSelected);
     iconRect.x += xNudge;
     iconRect.y += yNudge;
     textRect.x += xNudge;
     textRect.y += yNudge;
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Along the line of what TBM was saying:
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import javax.swing.*;
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JTabbedPane tabs;
ChangeListener listener;
int numTabs;
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Urgent - How to add a new control instead of tabs in JTabbedPane

Hi,
Please give me an idea or a sample program for how to add a new control
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in the tabpane empty place next to tabs

"Urgent" is not relevant to the question. Your question is no more important than anybody elses.
My answer in this posting show a limited solution:
http://forum.java.sun.com/thread.jspa?forumID=57&threadID=636289
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How to address a component in a background tab in a JTabbedPane

Hello and greetings for everybody, this is my first post here. I have a question:
I want to write a simple little chat program, which makes use of a JTabbedpane, and if the user gets a private message from another user, it would open a new tab with the given user's nick in the tab title, and would create a JTextArea on the opened tab and write the message to that specific JTextarea. My question: Is it possible to write on the JTextarea, while the given tab is in the background? How can I address that specific JTextarea on the specified tab?
Thank you very much in advance for the answers, and I wis you all a nice day!

// create a Map<String, JTextArea>
public static void privMsg(String nick) {
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            mw.tabpane.setSelectedIndex(mw.tabpane.indexOfTab(nick));
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How can we prevent JTabbedPanes from transferring focus to components outside of the tabs during tab traversal?

Hi,
I noticed a strange focus traversal behavior of JTabbedPane.
During tab traversal (when the user's intention is just to switch between tabs), the focus is transferred to a component outside of the tabs (if there is a component after/below the JTabbedPane component), if using Java 6. For example, if using the SSCCE below...
import java.awt.BorderLayout;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import java.awt.event.KeyEvent;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class TabbedPaneTest extends JPanel {
    public TabbedPaneTest() {
        super(new BorderLayout());
        JTabbedPane tabbedPane = new JTabbedPane();
        tabbedPane.addTab("Tab 1", buildPanelWithChildComponents());
        tabbedPane.setMnemonicAt(0, KeyEvent.VK_1);
        tabbedPane.addTab("Tab 2", buildPanelWithChildComponents());
        tabbedPane.setMnemonicAt(1, KeyEvent.VK_2);
        tabbedPane.addTab("Tab 3", buildPanelWithChildComponents());
        tabbedPane.setMnemonicAt(2, KeyEvent.VK_3);
        tabbedPane.addTab("Tab 4", buildPanelWithChildComponents());
        tabbedPane.setMnemonicAt(3, KeyEvent.VK_4);
        JPanel panel = new JPanel(new BorderLayout());
        panel.add(tabbedPane);
        JButton button = new JButton("Dummy component that gains focus when switching tabs");
        panel.add(button, BorderLayout.SOUTH);
         * To replicate the focus traversal issue, please follow these steps -
         * 1) Run this program in Java 6; and then
         * 2) Click on a child component inside any tab; and then
         * 3) Click on any other tab (or use the mnemonic keys ALT + 1 to ALT 4).
        button.addFocusListener(new FocusAdapter() {
            @Override
            public void focusGained(FocusEvent e) {
                System.err.println("Gained focus (not supposed to when just switching tabs).");
        add(new JScrollPane(panel));
    private JPanel buildPanelWithChildComponents() {
        JPanel panel = new JPanel();
        BoxLayout boxlayout = new BoxLayout(panel, BoxLayout.PAGE_AXIS);
        panel.setLayout(boxlayout);
        panel.add(Box.createVerticalStrut(3));
        for (int i = 0; i < 4; i++) {
            panel.add(new JTextField(10));
            panel.add(Box.createVerticalStrut(3));
        return panel;
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                JFrame frame = new JFrame("Test for Java 6");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new TabbedPaneTest());
                frame.pack();
                frame.setVisible(true);
... Then we can replicate this behavior by following these steps:
1) Run the program in Java 6; and then
2) Click on a child component in any of the tabs; and then
3) Click on any other tab (or use the mnemonic keys 'ALT + 1' to 'ALT + 4').
At step 3 (upon selecting any other tab), the focus would go to the component below the JTabbedPane first (hence the printed message in the console), before actually going to the selected tab.
This does not occur in Java 7, so I'm assuming it is a bug that is fixed. And I know that Oracle suggests that we should use Java 7 nowadays.
The problem is: We need to stick to Java 6 for a certain application. So I'm looking for a way to fix this issue for all our JTabbedPane components while using Java 6.
So, is there a way to prevent JTabbedPanes from passing the focus to components outside of the tabs during tab traversal (e.g. when users are just switching between tabs), in Java 6?
Note: I've read the release notes between Java 6u45 to Java 7u15, but I was unable to find any changes related to the JTabbedPane component. So any pointers on this would be deeply appreciated.
Regards,
James

Hi Kleopatra,
Thanks for the reply.
Please allow me to clarify first: Actually the problem is not that the child components (inside tabs) get focused before the selected tab. The problem is: the component outside of the tabs gets focused before the selected tab. For example, the JButton in the SSCCE posted above gets focused when users switch between tabs, despite the fact that the JButton is not a child component of the JTabbedPane.
It is important for me to prevent this behavior because it causes a usability issue for forms with 'auto-scrolling' features.
What I mean by 'auto-scrolling' here is: a feature where the form automatically scrolls down to show the current focused component (if the component is not already visible). This is a usability improvement for long forms with scroll bars (which saves the users' effort of manually scrolling down just to see the focused component).
To see this feature in action, please run the SSCCE below, and keep pressing the 'Tab' key (the scroll pane will follow the focused component automatically):
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import java.awt.event.KeyEvent;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTextField;
import javax.swing.JViewport;
import javax.swing.SwingUtilities;
public class TabbedPaneAutoScrollTest extends JPanel {
    private AutoScrollFocusHandler autoScrollFocusHandler;
    public TabbedPaneAutoScrollTest() {
        super(new BorderLayout());
        autoScrollFocusHandler = new AutoScrollFocusHandler();
        JTabbedPane tabbedPane = new JTabbedPane();
        tabbedPane.addTab("Tab 1", buildPanelWithChildComponents(20));
        tabbedPane.setMnemonicAt(0, KeyEvent.VK_1);
        tabbedPane.addTab("Tab 2", buildPanelWithChildComponents(20));
        tabbedPane.setMnemonicAt(1, KeyEvent.VK_2);
        tabbedPane.addTab("Tab 3", buildPanelWithChildComponents(20));
        tabbedPane.setMnemonicAt(2, KeyEvent.VK_3);
        tabbedPane.addTab("Tab 4", buildPanelWithChildComponents(20));
        tabbedPane.setMnemonicAt(3, KeyEvent.VK_4);
        JPanel panel = new JPanel(new BorderLayout());
        panel.add(tabbedPane);
        JButton button = new JButton("Dummy component that gains focus when switching tabs");
        panel.add(button, BorderLayout.SOUTH);
         * To replicate the focus traversal issue, please follow these steps -
         * 1) Run this program in Java 6; and then
         * 2) Click on a child component inside any tab; and then
         * 3) Click on any other tab (or use the mnemonic keys ALT + 1 to ALT 4).
        button.addFocusListener(new FocusAdapter() {
            @Override
            public void focusGained(FocusEvent e) {
                System.err.println("Gained focus (not supposed to when just switching tabs).");
        button.addFocusListener(autoScrollFocusHandler);
        JScrollPane scrollPane = new JScrollPane(panel);
        add(scrollPane);
        autoScrollFocusHandler.setScrollPane(scrollPane);
    private JPanel buildPanelWithChildComponents(int numberOfChildComponents) {
        final JPanel panel = new JPanel(new GridBagLayout());
        final String labelPrefix = "Dummy Field ";
        final Insets labelInsets = new Insets(5, 5, 5, 5);
        final Insets textFieldInsets = new Insets(5, 0, 5, 0);
        final GridBagConstraints gridBagConstraints = new GridBagConstraints();
        JTextField textField;
        for (int i = 0; i < numberOfChildComponents; i++) {
            gridBagConstraints.insets = labelInsets;
            gridBagConstraints.gridx = 1;
            gridBagConstraints.gridy = i;
            panel.add(new JLabel(labelPrefix + (i + 1)), gridBagConstraints);
            gridBagConstraints.insets = textFieldInsets;
            gridBagConstraints.gridx = 2;
            textField = new JTextField(22);
            panel.add(textField, gridBagConstraints);
            textField.addFocusListener(autoScrollFocusHandler);
        return panel;
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                JFrame frame = new JFrame("Test for Java 6 with auto-scrolling");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new TabbedPaneAutoScrollTest());
                frame.setSize(400, 300);
                frame.setVisible(true);
* Crude but simple example for auto-scrolling to focused components.
* Note: We don't actually use FocusListeners for this feature,
*       but this is short enough to demonstrate how it behaves.
class AutoScrollFocusHandler extends FocusAdapter {
    private JViewport viewport;
    private JComponent view;
    public void setScrollPane(JScrollPane scrollPane) {
        viewport = scrollPane.getViewport();
        view = (JComponent) viewport.getView();
    @Override
    public void focusGained(FocusEvent event) {
        Component component = (Component) event.getSource();
        view.scrollRectToVisible(SwingUtilities.convertRectangle(component.getParent(),
                component.getBounds(), view));
Now, while the focus is still within the tab contents, try to switch to any other tab (e.g. by clicking on the tab headers, or by using the mnemonic keys 'ALT + 1' to 'ALT + 4')...
... then you'll notice the following usability issue:
1) JRE 1.6 causes the focus to transfer to the JButton (which is outside of the tabs entirely) first; then
2) In response to the JButton gaining focus, the 'auto-scrolling' feature scrolls down to the bottom of the form, to show the JButton. At this point, the tab headers are hidden from view since there are many child components; then
3) JRE 1.6 transfers the focus to the tab contents; then
4) The 'auto-scrolling' feature scrolls up to the selected tab's contents, but the tab header itself is still hidden from view (as a side effect of the behavior above); then
5) Users are forced to manually scroll up to see the tab headers whenever they are just switching between tabs.
In short, the tab headers will be hidden when users switch tabs, due to the Java 6 behavior posted above.
That is why it is important for me to prevent the behavior in my first post above (so that it won't cause usability issues when we apply the 'auto-scrolling' feature to our forms).
Best Regards,
James

JTabbedPane: Components before and after the tabs themselves.

I want to make Google Chrome..!
Well, really, I want to have GUI stuff up in the title pane. In particular, I want the tabs of a TabbedPane up there.
I've concluded that the easiest way to accomplish this (hopefully in a somewhat LaF-neutral way) is to set the frame to be undecorated, and instead implement my own frame with handling and all. I'd set a JFrame undecorated, and put a JTabbedPane over the entire thing, sticking the application icon to the left of the tabs, and the minimize, maximize, close buttons to the far right of the tabs themselves.
If anyone have any other suggestions to this initial problem, I would seriously appreciate to hear about them.
But given the above solution: How would I go about getting a component to the left of the tabs, and some other components to the right of the tabs, of a JTabbedPane? A LaF-neutral solution would be very much appreciated - but I have faint hopes here, so pointers for how to accomplish this using LaF-tricks will be appreciated too.
I've seen that laf-widget from kirill, https://laf-widget.dev.java.net/, does something like it (the magnifying-glass icon to the left of the tabs) for several LaFs. However, I must admit that I'm not yet well enough versed to understand how he does it - and also it seems like a somewhat complicated process, whereby one "physically" change the LaF in question (bytecode manipulates it), injecting the laf-widget stuff (and I still don't know how the JTabbedPane or TabbedPaneUI is modulated to inject that icon).
Any help or pointers will be much appreciated!
Thanks,
Endre.

Could you elaborate slightly on that? I don't get your "what's left" idea..?
I think the JTabbedPane should have this functionality built-in. It is a truly obvious need, to the extent that it has had to be solved several times by others.
From an answer to this problem on StackOverflow: The JideTabbedPane from the Jide open source parts have an setTabLeadingComponent. However, Jide doesn't manage to follow the active LaF (the installs its own UI delegate), so I don't instantly want to jump on it.

Adding a new Tab to an existing JTabbedPane not working

Hello all,
I am trying to add & display a new tab to an existing JTabbedPane when the user
clicks on a button. For some reason the new tab, being added is not being displayed, and I don't know why. I have called invalidate(), validate() on the parent containers but haven't had any luck. I have also played around with SwingUtilities.invokeLater() and the Event thread, but have been unsuccessfull.
Any help would be greatly appreciated.
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               JPanel panel_quoteRequestIntermediatePanel = new JPanel();
               // Set layout manager for panel
               panel_quoteRequestIntermediatePanel.setLayout(
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               panel_quoteRequestIntermediatePanel.add(createQuoteRequestDetailsButtons());
               // Add the intermediate panel to the main panel
               panel_quoteRequestDetails.add(panel_quoteRequestIntermediatePanel);
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          public JPanel createQuoteRequestDetailsButtons() {
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               JPanel panel_quoteRequestDetailsButtons = new JPanel();
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MS,
Try copying one existing TAB and use that, this happens only when there is improper xml content. You can open the xml in the browser/visual studio for better clarity and then try making the changes. Doing IIS Reset will be required but in the meanwhile you
can put the original RCDC which will work till the time you make any change in new TAB.
Regards,
Manuj Khurana

Creating a dropdown for the tabs that use JTabbedPane

Hi all,
I have an application that uses a JTabbedPane to create tabs. Currently it uses the default to scroll if there are more tabs than what can be fit on the screen. I would also like to provide a dropdown next to the scroll arrows so that the user can see all the tabs on a dropdown list and select one w/o having to scroll left and right. I've seen this done on the NetBeans IDE 4.1 and 5.0. Is this something I can leverage from the Swing API (using JDK 5), grab from some open-source library, or must code myself? Let me know how I can do this. Thanks in advance!
-los

Thanks for the reply!
I understand what you are describing but am a bit puzzled on a couple of things (maybe because I just got into Swing).
My biggest question is on how to place the combo box in the tabbed pane next to the scrolling arrows. I'm looking at the JTabbedPane Javadoc and I do not see a place where one can add other components such as this combo box (other than the tabs themselves).
Another question is that the combo box will have a width the size of the longest text contained in the box. How do I remove this length and just show the dropdown arrow. When the user clicks this arrow, the combo box appears with the list of items, i.e. I want to mimic what the NetBeans IDE does.
Thanks in advanced!
-los

Resize JTable in JTabbedPane

Given the FileTableDemo from the Java Foundation Class in a Nutshell book.(O'Reilly) Chapter 3 page 51 in my addition.
I have modified the example to place the JTable in a JTabbedPane. Now when the window (JFrame) is resized by the user the JTable no longer resizes. How do I passing the "resizing" into the component (JTable) placed in the JTabbedPane?
Here is the code: My deviation from the example is enclosed in "///////////KBS" and of course the line frame.getContentPane().add(myTP, "Center"); where "pane" has been replaced with "myTP"
Thanks Brad
import javax.swing.*;
import javax.swing.table.*;
import java.io.File;
import java.util.Date;
public class FileTableDemo
public static void main(String[] args)
// Figure out what directory to display
File dir;
if (args.length > 0)
dir = new File(args[0]);
else
dir = new File(System.getProperty("user.home"));
// Create a TableModel object to represent the contents of the directory
FileTableModel model = new FileTableModel(dir);
// Create a JTable and tell it to display our model
JTable table = new JTable(model);
JScrollPane pane = new JScrollPane(table);
pane.setBorder(BorderFactory.createEmptyBorder(60,20,20,20));
////////KBS
JTabbedPane myTP = new JTabbedPane();
JPanel myOne = new JPanel();
JPanel myTwo = new JPanel();
myOne.add(pane);
myTP.add("One", myOne);
myTP.add("Two", myTwo);
////////KBS
// Display it all in a scrolling window and make the window appear
JFrame frame = new JFrame("FileTableDemo");
frame.getContentPane().add(myTP, "Center");
frame.setSize(600, 400);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
// The methods in this class allow the JTable component to get
// and display data about the files in a specified directory.
// It represents a table with six columns: filename, size, modification date,
// plus three columns for flags: direcotry, readable, writable
class FileTableModel extends AbstractTableModel
protected File dir;
protected String[] filenames;
protected String[] columnNames = new String[] {
"name",
"size",
"last modified",
"directory?",
"readable?",
"writable?"
protected Class[] columnClasses = new Class[] {
String.class,
Long.class,
Date.class,
Boolean.class,
Boolean.class,
Boolean.class
// This table model works for any one given directory
public FileTableModel(File dir)
this.dir = dir;
this.filenames = dir.list();
// These are easy methods
public int getColumnCount()
return 6;
public int getRowCount()
return filenames.length;
// Information about each column
public String getColumnName(int col)
return columnNames[col];
public Class getColumnClass(int col)
return columnClasses[col];
// The method that must actually return the value of each cell
public Object getValueAt(int row, int col)
File f = new File(dir, filenames[row]);
switch(col)
case 0: return filenames[row];
case 1: return new Long(f.length());
case 2: return new Date(f.lastModified());
case 3: return f.isDirectory() ? Boolean.TRUE : Boolean.FALSE;
case 4: return f.canRead() ? Boolean.TRUE : Boolean.FALSE;
case 5: return f.canWrite() ? Boolean.TRUE : Boolean.FALSE;
default: return null;
}

Well, I didn't find an answer but I did find a solution.
The JPanel is the problem. I use it to help with layout which is not obvious in this example.
As you can see in the code the JTable is placed in a JScrollPane which is place in a JPanel which is placed in a JTabbedPane.
If I use Box instead of JPanel the JTable in the JScrollPane in the Box in the TabbedPane in the JFrame resizes correclty.
So although JPanel is resizable with setSize it does not get resized when it's JFrame gets resized.
I would still like to know why?
////////KBS
JTabbedPane myTP = new JTabbedPane();
Box myOne = Box.createHorizontalBox();
Box myTwo = Box.createHorizontalBox();
myOne.add(pane);
myTP.add("One", myOne);
myTP.add("Two", myTwo);
////////KBS

AutoResize JTabbedPane

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