CODEWITHSUNDEEP
javaswinginvokelater
Adam Hughes
Adam Hughes

Reputation: 16319

EventQueue.invokeLater with multiple swing UIs

There's a nice discussion on EventQueue.invokeLater() here.

I have a controller class, Master() that loads two UI windows in my application. For example:

public class Master(){

     public Master(){
        aView = new subView();
        bView = new subView();

Where subView extends JFrame and has the following main method:

public class SubView extends JFrame{
    ....

    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new SubView();
            }
        });}
}

Notice that SubView.main() uses the invokeLater(). My question is how can I invokeLater() within master? Something like:

public class Master(){

     public Master(){
        aView = EventQueue.invokeLater(new subView);
        bView = EventQueue.invokeLater(new subView);

It's not this simple because invokeLater does not return anything. Furthermore, because it's "invoked later", the values of aView and bView remain null in Master. Is there anyway to invoke both in the same manner that main() would invoke one of them in the runLater thread?

Upvotes: 0

Views: 376

Answers (3)

trashgod
trashgod

Reputation: 205875

It may prove awkward to solve this problem by invoking instances of Runnable. As an alternative use a SwingWorker to update the table models of both the master and detail views. This example may be a useful staring point.

Upvotes: 1

Adam Hughes
Adam Hughes

Reputation: 16319

Following Peter's suggestion, I did the following:

I created an intermediate Runnable called RunUIThread that returns that exposes the objects aView and bView, so I can return them to my Master program. Peter, do you think this is valid?

    RunUIThread uiThread = new RunUIThread();
    try {
        java.awt.EventQueue.invokeAndWait(uiThread);
    } catch (InterruptedException | InvocationTargetException ex) {
        LOG.error("MasterView interrupted or failed to invoke RunUIThread");
    }
    aView = uiThread.getaView();
    bView = uiThread.getbView();

Upvotes: 0

Peter Lawrey
Peter Lawrey

Reputation: 533880

I would use invokeAndWait as you need to wait for the outcome.

SubView aView, bView;

public Master() {
    java.awt.EventQueue.invokeAndWait(new Runnable() {
        public void run() {
            aView = new SubView();
            bView = new SubView();
        }
    });
    // aView and bView will be initialised.
}

Upvotes: 1

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