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help getting a sub-pane of a JTabbedPane to initialize

mecase Member Posts: 11
edited Apr 17, 2013 12:16PM in Java Desktop Applications

I have an application that a JTabbedPane with 5 tabs/panes. One of these has three tabbed panes in it. What I want to do is that when I switch between one of the top-level five and the three inside another one of the top five (i.e. the sub-panes, I guess you could call them) I want certain values to update from an underlying model.

The current code does this updating (in some cases but not this one) by invoking methods in the other panes like "updateGUI". The simplest solution is to let them all have a reference to each other and call the appropriate updates on the other panes. In fact, most have references to each other. I was simply trying to avoid these explicit calls from various places on condition of this and that to change this or that when a simple solution seems to me to be to tell the GUI to update its values when it gains focus. But I never trigger this. Relevant code:

The engtab pane has 3 panes:
    JTabbedPane engtab;

    public void buildGUI() {
//...bunch of stuff
        engtab.addFocusListener(new engtabFocusListener());
The calls to PaneBuild are implemented like this:
public void PaneBuild(JTabbedPane JTP) {
// the rest of the pane.
    JTP.add("Motor GUI", mainPanel);
I naively tried to add a focus listener to engtab in the first class (the one that calls the PaneBuild methods) like so:
    private class engtabFocusListener implements FocusListener {

        public engtabFocusListener() {

        public void focusGained(FocusEvent fe) {
            System.out.println("focusGained for engtab of main.");
//            MGUI.updateGUI(MotorEnum.all, true, 1);
//            InstCon.updatecurrentGUI();
//            InstCon.updatenextGUI();

        public void focusLost(FocusEvent fe) {
            System.out.println("focusLost for engtab of main Not supported yet.");

    public void buildGUI() {
//... stuff

        engtab = new JTabbedPane();        
        engtab.addFocusListener(new engtabFocusListener());
I never see the messages about focus. Thanks for your help.

Edited by: mecase on Apr 17, 2013 8:44 AM


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