[maemo-developers] [maemo-developers] Maemo 2.0 API changes, signals and properties (was: ANN: Eagle)

[From: Gustavo Sverzut Barbieri]

On 4/19/06, Tommi Komulainen <tommi.komulainen at nokia.com> wrote:
> On Tue, 2006-04-18 at 08:51 -0300, ext Gustavo Sverzut Barbieri wrote:
> > Hello,
> >
> > Eagle (http://www.gustavobarbieri.com.br/eagle/) was ported to
> > Maemo/Hildon (http://blog.gustavobarbieri.com.br/2006/04/eagle-in-maemo.html).
>
> In your blog you had mentioned this:
>
> > However I opted to not port every component, like HildonColorButton
> > or HildonNote because I think they're not well designed, they don't
> > even provide signal "changed", used by Eagle's DataWidget to persist
> > data automatically. As API will change in Maemo 2.0, I won't bother
> > with this until then.
>
> HildonColorButton and HildonNote APIs are not changing in any signifcant
> way, so don't let that stop you from including more widgets in the
> supported list.
>
> Hildon-related API changes are more or less limited to HildonApp and
> AppView and gtk_infoprint (and widgets no one was supposed to be using
> anyway)  See http://maemo.org/maemowiki/HildonWidgets for a bit more
> details.
>
>
> HildonColorButton doesn't need a specific "changed" signal, it is
> already provided, though it's called "notify::color" and the callback
> signature is slightly strange
> (http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#GObject-notify)
> (The older version of generated API documentation misses some crucial
> bits like signals and properties, the new API has slightly better
> generated documentation in
> https://stage.maemo.org/svn/maemo/projects/haf/doc/api/hildon-libs/HildonColorButton.html)
>
> It's a less known feature in GObjects that all properties have implicit
> "changed" signals associated with them. It has the benefit that you
> don't need multiple "foo-changed", "bar-changed", ... signals for
> complex objects.
>
> So the lack of "extra" signal is intentional and we plan to use the same
> design in new widgets as well, see HildonProgram for example.

Thanks!

I wasn't aware of this GObject feature. I'll try to implement these
into Eagle ASAP, then I'll let you know.

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Gustavo Sverzut Barbieri
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