RE: [Java-gnome-developer] Bugreport concering Frame

[Jeffrey M. <Jef...@Br...>]

>=20
> Appeared this frame-error only with GCJ?

This was an error with all JVM's (as far as I know).  The
constructor was passing 'null' to the native layer and
the native layer was not checking for nulls.

>=20
> > This issue is a little more complex.  Internally I am using
> > the "g_signal_connect_closure_by_id" method to connect my
> > signals to a native method that calls the appropriate Java
> > method.  In that callback method I am setting the "return_value"
> > parameter to the value returned from the Java layer.  In the
> > case of a "delete" signal I am always returning "false" which
> > should cause the gtk library to propagate a "destroy" signal
> > to the widget.  This does not seem to be happening correctly.
> > If the signal is being propagated it is not re-entering via
> > the same route (I am not receiving the event in my callback).
> > I am aware of this problem and have already started to look into
> > it.  I will keep the list up to date on my progress.
> >
> How was it done in 0.7.1? Am I right that the 0.8 is a very big step=20
> into the future?

Closures really didn't exist in glib at the time 0.7 was out.  This
is only new with GTK 2.  0.8 is a very big step into the future. =20
The entire bindings have been rewritten to create a more robust
foundation for the future.

> I like the way like events are handeld in 0.8 very much. The=20
> funktion-based methode was really not java-like...

Thanks for the complement.

>=20
> May I ask some further questions:
>=20
> 1.) How is GarbageCollection in Java-Gnome done? The=20
> SWT-Folks told me,=20
> it isnt possible to GC system-recources, because the GC doesnt know=20
> anything about the Gui-recources. Whats about seting the heap-size to =

> 2gig and the write a program which simply creates and=20
> destroys windows...

GTK handles almost all of the reference counting and resource=20
allocation (including the freeing of system resources).  Since=20
SWT also wrapps Motif and Win32 they could not depend upon this
feature (it doesn't exist on Motif and Win32).

> 2.) Does GTK2 have a simple Widget which can render HTML? I want to=20
> write a Configuration-Fronent very similar to the KDE-Control-Center, =

> with dynanically loaded plugins, and  also want to include a good=20
> tutorial and help with pictures, tables (isnt so important) and=20
> links(!!). Is there another way to do so (I read that the=20
> Text-Widget of=20
> GTK2 can embedd pictures), the format is not so important, I=B4m only =

> afraid that this widget cant make links...

The new text widget is very rich.  I am not sure if it supports links.
You can find more info at
http://developer.gnome.org/doc/API/2.0/gtk/TextWidget.html.
This widget isn't completely tested in the current implementation.  =
Please
let us know if you find any problems.

Thanks
-Jeff