JTabbedPane, listener that kicks in before tab changing

I have a JtabbedPane, and when the user clicks on a certain tab, I need to do some computing before actually switching to the new tab.
Adding a ChangeListener is no good, cause its method stateChanged(), kicks in only after the tab is changed. I need a Listener that gives me a handle to the event of tab selection, before the tab is actually changed.
Now, I can think of a few hacks to solve this problem, but I am sure there has to be a clean way of doing this. Any ideas ?
Anshuman.

The model of a JTabbedPane is a SingleSelectionModel. You can subclass DefaultSingleSelectionModel
and override its setSelectedIndex:
public void setSelectedIndex(int index) {
//react to change about to occur
super.setSelectedIndex(index);

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When a tab change is requested, I need to do some checking before allowing the change to take place. If the check fails, I need to stop the change from taking place.
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I have moved from Borland Builder C++ and Delphi to Java in the last 4 months so I guess I'm still finding my way here.
Using the ChangeListener, the tab changing has already taken place when xxxxStateChanged(ChangeEvent evt) is called.
And to ovveride setSelectedIndex() I would have to subclass JTabbedPane. I was hoping there was an easier way.
Thanks anyway.
Paul.

Stopping JTabbedPane tab change.

I was wondering if it was possible to stop tab changes on a JTabbedPane.
Right now I am creating an applet with a JTabbedPane and if you click on another tab of the JTabbedPane I am able to capture the event of the change and perform an action using an event stateChanged.
However, I have instances in which I want to pop up a YES_NO_CANCEL JoptionPane instructing whether or not to Save data from that TabPane, and if the user selects cancel, then I want the JTabbedPane NOT to change tabs, I want it to remain on the current Tab with the current data...
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Hi,
Thanks for your help..
I solved my problem with a simple solution but I'm not sure whether that one is a right way to do.
I will explain how I implemented. I alreday had my own MyTabbedPane class which extends from JTabbedPane.
I overrided public void setSelectedIndex(int newIndex) method of JTabbedPane, and which I found the changeEvent calls this method first.
So I overrided as below:
    if(oldIndex != newIndex)
      //MyPanel is my customized panel
      MyPanel prevPanel = (MyPanel)getComponentAt(selectedIndex);
      //promptSaveDialog method returns true after processing save
      //if user choosed Cancel, it returns false
      if(prevPanel.promptSaveDialog())
        super.setSelectedIndex(newIndex);
        selectedIndex = newIndex;
    else
      super.setSelectedIndex(newIndex);
      selectedIndex = newIndex;
    }But it works as of now and I found this as a simple solution. Please let me know if there is some major disadvantages in this design.
Thanks a lot for your support

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JTabbedPane, listener that kicks in before tab changing

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