Plasma->Model/View->Nepomuk

[Aaron J. Seigo]

On October 6, 2009, PierreL wrote:
> The thing is now, with this plasmoid already added in a previous KDE
>  session, when KDE starts, it seems, plasma is started before Nepomuk
>  service or maybe I'm wrong, but the plasmoid's model is empty (not
>  populated with any Nepomuk data).

either individual plasmoids need to track the availability of services, or we 
need to provide a way in libplasma to do this.

right now we have the following important services that can modify the 
behaviour of Plasmoids:

* compositing (status available via Theme; Svg's are updated)
* power (Applet::shouldConserverResources; but no status change notification)
* network (each plasmoid must do it via Solid::Networking, which provides both 
current info as well as change notification)
* nepomuk (each plasmoid must do it by checking dbus connections)

if this collection continues to grow, it might be a good idea to have some 
mechanism generally available to track them.

one way to do this without adding API to libplasma would be to write a 
DataEngine that starts tracking a given resource when a source is requested by 
that name. 

e.g. if the "nepomuk" source is requested, it would create a nepomuk source 
with perhaps { "available" => bool } as the data and update the source 
whenever the resources becomes available or not.

-- 
Aaron J. Seigo
humru othro a kohnu se
GPG Fingerprint: 8B8B 2209 0C6F 7C47 B1EA  EE75 D6B7 2EB1 A7F1 DB43

KDE core developer sponsored by Qt Development Frameworks
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