Re: [Java-gnome-developer] Raising events async on Gtk main loop

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

On Fri, 2004-29-10 at 15:32 -0500, Jerry Haltom wrote:
> In SWT, one creates a Runnable, and uses the Display object to add it to
> the main loop. When the main loop next cycles, it runs it.
>=20
> Good for multi-threading. You can have a thread in the background which
> passes events to the Gtk main loop.

It seems that one does this:

            CustomEvents.addEvent(new Runnable() {
               public void run() {
                  // code to update the GUI goes here.

                  // eg, I keep a static reference to the
                  // instance to make it easy to call things.
                  MyProgram.ui.someUpdateMethod(args);
               }
            });

Instruction from Mark Burgess was that it is *absolutely necessary* to
do GUI updates from within the Gtk main loop; these "CustomEvents" are
called by java-gnome's gtk main wrapper.

Having tested all this, I can confirm by observation that if you don't
do it this way, the main loop will miss updates (because of different
threads getting called and switched in various random sequences).

I do all this from a worker thread. I have an example of all this
posted:

   tla register-archive http://research.operationaldynamics.com/arch/hacks/
   tla get an...@op...--hacks/geode--trunk--0.3 geode
   cd geode
   make [java|native]

(you'd probably have to fiddle with the exact library paths in the Makefile=
)

AfC
Toronto

--=20
Andrew Frederick Cowie

OPERATIONAL DYNAMICS
Operations Consultants and Infrastructure Engineers

http://www.operationaldynamics.com/