From kde-devel  Thu Jun 09 11:20:04 2011
From: Sebastian =?iso-8859-1?q?K=FCgler?= <sebas () kde ! org>
Date: Thu, 09 Jun 2011 11:20:04 +0000
To: kde-devel
Subject: Re: Communication between C++ and QML
Message-Id: <201106091320.04552.sebas () kde ! org>
X-MARC-Message: https://marc.info/?l=kde-devel&m=130761846112693

On Friday, June 03, 2011 23:12:03 Stefan Majewsky wrote:
> I've been looking into QML again for kdegames. Some background: I
> added a QDeclarativeImageProvider to feed images from libtagaro's
> ThemeProvider into QML, and that mostly works (with an emphasis on
> mostly; QTBUG-14900). Then I tried something more difficult: I wanted
> to port a game from QML, and chose KNetwalk because it has its
> algorithms split in an AbstractGrid class, which is subclassed for the
> QGraphicsView representation.
> 
> Now as far as I understand the (IMHO surprisingly sparse)
> QtDeclarative module documentation, the main gateway for transferring
> information between C++ and QML is
> declarativeView->engine()->rootContext()->setContextObject(). QML
> retrieves data from the properties of this object and the subobjects
> which it references, and invokes via JavaScript functions in this
> object to propagate user input to the C++ layer.
> 
> Is this correct? If so, I get a feeling that it would require a
> potentially epic amount of boilerplate to make my already
> interface-agnostic data available to QML. Can I do anything to make
> this task simpler?

You could use Plasma::DataEngine on the C++ side, and then get at the data in 
your QML code using PlasmaCore.DataSource. That's how we generally do it in 
Plasma.

Cheers,
-- 
sebas

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