QML and DBus in plasma

[Aaron J. Seigo]

On Tuesday, July 19, 2011 16:16:21 Weng Xuetian wrote:
> So I'd like to know that is the dataengine has some way to "push" the
> changes to plasmoid? 

Yes; if something is connected to a source without an update interval, and the 
DataEngine changes the data for that source, then the visualization is 
notified of this. In other words, with no update interval defined, the 
DataEngine operates essentially in push mode.

> Or for such dbus application, is the QtDBus and
> C++ the only choice? (Sorry but I don't know anything of Python..).

That's one possibility. Another is a DataEngine. The nice thing about using a 
DataEngine is that you get a very clean, re-usable split between data and 
visualization. This means that in future if someone once again wishes to redo 
the UI or do a different UI, the logic code does not need to change.

Also keep in mind that a DataEngine may provide services and that you can also 
load Services directly with a DataEngine if needed. Services allow both read 
and write access, so if your Plasmoid needs to interact with the DBus service 
(e.g. make DBus calls itself), then this may be a good way to go about it.

-- 
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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