Re: [Java-gnome-developer] Problem with Threading (I guess)

[Emmanuel R. <emm...@gm...>]

Hi,

I think that the problem is because  you are accessing your widgets from 
your second thread.
Only the event loop thread is allowed to manipulate the widgets.
Take a look at the following page there is an explanation and some 
sample code.
http://java-gnome.sourceforge.net/cgi-bin/bin/view/Main/MultiThreaded


Stefan Prelle wrote:
> Hi all,
>
> I am trying to build a splashscreen that shows the process while the
> application is loading data. I found that after a short time, no
> progress changes are visible while the loading continues.
>
> I broke my problems down to a simple test program that forks a thread to
> change the progress and that waits a specific amount of time between two
> changes. 
>
> public class SplashTest {
>
>     static ProgressBar bar;
>     static TextView text;
>     
>     //------------------------------------------------------
>     public static void main(String[] args) {
>         Gtk.init(args);
>         
>         // Open a window with a progress bar and a text view.
>         Window window = new Window();
>         VBox box = new VBox(false,5);
>         window.add(box);
>         bar = new ProgressBar();
>         box.add(bar);
>         text = new TextView();
>         box.add(text);
>         window.showAll();
>         
>         // Now create progress changing thread
>         Thread thread = new Thread(new Runnable(){
>            public void run() {
>                for (int i=0; i<=100; i+=10) {
>                    System.out.println("Now "+i);
>                    bar.setFraction(i/100.0);
>                    bar.setText(i+"%");
>                    text.getBuffer().setText("Loaded "+i+"%");
>                    synchronized(this) {
>                        try {
>                            Thread.sleep(1000);
>                        } catch (InterruptedException e) {
>                            // TODO Auto-generated catch block
>                            e.printStackTrace();
>                        }
>                    }
>                }                
>             }});
>         
>         thread.start();
>         Gtk.main();
>     }
> }
>
> When I do run this program, the progress bar stops at 10 or 20 percent,
> the text view stops at 0 or 10 percent. 
> If you reduce the waiting time between changes to a lower value - e.g.
> 500ms - everything is fine.
>
> Any idea what is causing this?
>
> Regards,
>   Stefan
>
>
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