[maemo-developers] Live Backgrounds in PR1.2 hildon-desktop

[From: Sivan Greenberg]

That is very cool Kimmo!

I have a life improving app use case for that, I'll be sure to check
you examples.

The manager has to be written in C/GTK or can be eased off in PyGtk ?

Sivan

2010/6/1 Kimmo Hämäläinen <kimmo.hamalainen at nokia.com>:
> Hello!
>
> The PR1.2 has a super-secret, unplanned feature that we smuggled in:
> so-called "live backgrounds" support in hildon-desktop (>= 1:2.2.133-1).
> Live background is a window that is displayed below or front of the Home
> applets, either in a specific desktop view (panning with the view) or as
> common for all views (static).
>
> Live background window is recognised when an integer-valued
> _HILDON_LIVE_DESKTOP_BACKGROUND window property is found in the window:
>
> 0        this client is not a live background
> 1-4      home view specific live background
> 101-104  home view specific live foreground (above applets)
> -1       global live background used for all home views
> -101     global live foreground used for all home views
>
> Notice that you probably want to use a transparent window for "live
> foregrounds" so that the applets and the background image are still
> visible.  What you also "want" (I tell you) is to pause the animation of
> the background when it's not visible.  I have ported xsnow for
> demonstrating how to do the pausing and detect positions of the Home
> applets, the xsnow patch (against xsnow 1:1.42-8) is attached (I'm also
> trying to create a Garage project for it). The xsnow pausing is not
> optimal (it periodically wakes up to check sysfs for the display
> brightness), but it has not eaten all my battery even if I let it run
> overnight.
>
> Someone could write a Control Panel plugin for managing live backgrounds
> (these window properties), since there is no tool as yet.
>
> There is a basic code example / test program here:
> http://maemo.gitorious.org/fremantle-hildon-desktop/hildon-desktop/blobs/master/tests/test-live-bg.c
>
> -Kimmo
>
>
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