Re: [Java-gnome-developer] ProgressBar

[Andrew C. <an...@op...>]

On Tue, 2008-02-26 at 11:09 +0100, Alfonso wrote:
> - One is the pulse method, to activate the progressbar.

ProgressBar has setFraction(), but you're right. No one has exposed
pulse() as yet. Perhaps you'd like to contribute that and the attendant
documentation? See HACKING.

> - On the other side, to make the progressbar update while doing other
> work

java-gnome is thread safe. Do your "other work" in a worker thread, and
make the calls to update your ProgressBar from there. So long as the
main loop is running [ie, a thread has called Gtk.main()] things will
work right.

If you grab the source code, you'll see
tests/prototype/WorkerThreads.java. That's not a tutorial, as such, but
if you have a read of that you should get the idea. It's the program
that was used in the testing discussed in the second link below.

[Hm. We should move that to doc/examples/ one of these days]

You can find discussion of the theory that led up to our thread safety
design at
http://research.operationaldynamics.com/blogs/andrew/software/gnome-desktop/gtk-thread-awareness.html (part 1) and then http://research.operationaldynamics.com/blogs/andrew/software/java-gnome/thread-safety-for-java.html (part 2). There is mention of the GDK lock at http://java-gnome.sourceforge.net/4.0/doc/api/org/gnome/gdk/Gdk.html 

AfC
Sydney

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Andrew Frederick Cowie

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