A component within JTabbedPane with overlay layout

Question

Hi, I use the following solution to have a component within the upper right corner of the JTabbedPane: [http://forums.sun.com/thread.jspa?forumID=57&threadID=636289&start=2|http://forums.sun.com/thread.jspa?forumID=57&threadID=636289&start=2] . It works great, but when I'm resizing a window with the JTabbedPane with the JTabbedPane.WRAP_TAB_LAYOUT and width of all of the tabs is higher than size of the window the tabs are wrapped. But it should be wrapped when width of all tabs + width of the added component is higher than the size. I have no idea how to do this. Any ideas?
Please see the screenshot: [http://img150.imageshack.us/img150/5629/btn.png|http://img150.imageshack.us/img150/5629/btn.png]

Answer 1

Just a quick idea:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.plaf.*;
class TabbedPaneTest {
  public JComponent makeUI() {
    UIManager.put("TabbedPane.tabAreaInsets",
                  new InsetsUIResource(6, 2, 0, 60));
    JSplitPane sp = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
    sp.setTopComponent(makeTabPanel(new JTabbedPane()));
    sp.setBottomComponent(makeTabPanel(new ClippedTitleTabbedPane()));
    sp.setPreferredSize(new Dimension(320, 240));
    return sp;
  private JPanel makeTabPanel(final JTabbedPane tab) {
    tab.addTab("asdfasd", new JLabel("456746"));
    tab.addTab("1234123", new JScrollPane(new JTree()));
    tab.addTab("6780969", new JLabel("zxcvzxc"));
    tab.setAlignmentX(1.0f);
    tab.setAlignmentY(0.0f);
    JButton b = new JButton(new AbstractAction("add") {
      @Override public void actionPerformed(ActionEvent e) {
        tab.addTab("test", new JScrollPane(new JTree()));
    b.setAlignmentX(1.0f);
    b.setAlignmentY(0.0f);
    JPanel p = new JPanel();
    p.setLayout(new OverlayLayout(p));
    p.add(b);
    p.add(tab);
    return p;
  public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
      @Override public void run() { createAndShowGUI(); }
  public static void createAndShowGUI() {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    frame.getContentPane().add(new TabbedPaneTest().makeUI());
    frame.pack();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
class ClippedTitleTabbedPane extends JTabbedPane {
  //XXX Nimbus NPE
  Insets tabInsets = UIManager.getInsets("TabbedPane.tabInsets");
  Insets tabAreaInsets = UIManager.getInsets("TabbedPane.tabAreaInsets");
  public ClippedTitleTabbedPane() {
    super(JTabbedPane.TOP);
    setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);
    addComponentListener(new ComponentAdapter() {
      @Override public void componentResized(ComponentEvent e) {
        initTabWidth();
  @Override
  public void insertTab(String title, Icon icon, Component component,
                        String tip, int index) {
    super.insertTab(title, icon, component, tip==null?title:tip, index);
    JLabel label = new JLabel(title, JLabel.CENTER);
    Dimension dim = label.getPreferredSize();
    label.setPreferredSize(
        new Dimension(0, dim.height+tabInsets.top+tabInsets.bottom));
    setTabComponentAt(index, label);
    initTabWidth();
  private void initTabWidth() {
    Insets insets = getInsets();
    int areaWidth = getWidth() - tabAreaInsets.left - tabAreaInsets.right
                               - insets.left        - insets.right;
    int tabCount = getTabCount();
    int tabWidth = 0;
    switch(getTabPlacement()) {
      case LEFT: case RIGHT:
      tabWidth = areaWidth/4;
      break;
      case BOTTOM: case TOP: default:
      tabWidth = areaWidth/tabCount;
    int gap = areaWidth - (tabWidth * tabCount);
    if(tabWidth>80) {
      tabWidth = 80;
      gap = 0;
    tabWidth = tabWidth - tabInsets.left - tabInsets.right - 3;
    for(int i=0;i<tabCount;i++) {
      JLabel l = (JLabel)getTabComponentAt(i);
      if(l==null) break;
      int h = l.getPreferredSize().height;
      l.setPreferredSize(new Dimension(tabWidth+((gap>0)?1:0), h));
      gap--;
    revalidate();
}