[maemo-developers] Semi-transparent background for Desktop Widget (Python + Cairo)

[From: Anderson Lizardo]

Hi,

On Wed, Dec 23, 2009 at 5:28 PM, Brent Chiodo <bchiodo at gmail.com> wrote:
> Hi,
>
> The code I've been looking at is a fairly simple widget in Extras called
> countdown-home. 95% of it is "fluff" and has nothing to do with this problem
> so I've attached a working Python Desktop Widget (very simple, just a couple
> gtk.Label's). countdown-home is available from here:
>
> http://repository.maemo.org/extras/pool/fremantle/free/source/c/countdown-home/
>
> (I tried attaching the C file, but the list said it was too big).
>
> If you could try to translate the cairo code from coundown-home into the
> Python example, that would be awesome!

I didn't translate the code above, but the simpler example Marc sent
(example_clock_widget), because it was just easier to experiment with
(and I will probably add to the examples section on the PyMaemo wiki
page).

But from this translation experiment, I noticed a few points you must
be aware when implementing python widgets using cairo:

* Use do_expose_event() and do_realize() methods instead of realize()
and screen_changed() ones you used (just rename "def expose(self,
widget, event)" to "def do_expose_event(self, event)" and "def
screen_changed(self, widget)" to "def do_realize(self)"

* Remember to call hildondesktop.HomePluginItem.do_realize(self) at
the end of your do_realize() implementation (**very important**). This
is needed because hildondesktop has its own internal implementation
that must be called.

The code is attached. Merry Christmas :)

PS: I didn't translate the settings dialog part yet. Will do so later.

Regards,
-- 
Anderson Lizardo
OpenBossa Labs - INdT
Manaus - Brazil
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