KDE-ify QML all across KDE

[Volker Krause]

On Thursday 27 January 2011 13:39:40 Shantanu Tushar Jha wrote:
> Hi Marco,
> 
> I'm am working on Calligra Mobile as an Intern at Nokia. Just remembered
> that you had sent this mail. I understand that libkdeclarative is planned to
> be *the* way to access essential kdelibs functionality. If so, I was
> thinking about adding functionality to libkdeclarative as per needs arise
> for calligra mobile.
> 
> e.g. right now I need a way to access Image loading in QML similar to
> KIcon("kwords.png"), so we can add something to libkdeclarative, right?

IIRC we have code for icon finding and loading (KStdDirs, KIcon, etc) already 
in the QML/KDE integration of KDE PIM, sort of a very early predecessor of 
libkdeclarative, see kdepim-runtime/qml/kde/kdeintegration.cpp, maybe some of 
this can be reused and merged into libkdeclarative.

regards
Volker

> 
> Cheers,
> 
> > Hi all,
> > during last couple of days I've been working on
> > git at git.kde.org:scratch/mart/libkdeclarative
> > 
> > This is a thing we agreed upon (and that I promised to do ;) at the
> > mobile sprint.
> > It's a little ~60KB library that's meant to be used inside KDE apps that
> > are
> > using QML, what do they do? but before, a bit of history:
> > 
> > Since 4.6, Plasma has bindings to write plasmoids using just
> > QML/Javascript,
> > and especially in the light of our previous pure JS bindings, we
> > immediately
> > had some issues, that made KDE integration really poor, namely:
> > * no way to use our own i18n
> > * not possible to use Icons, pixmap and images (only pathnames of
> > on-disk
> > images)
> > * no kconfig, kjobs
> > * all urls manipulation hidden deeply into default qml elements only
> > accepting
> > strings
> > 
> > This mostly because 2 severe design limitations of QML:
> > * no access to the QScriptEngine
> > * read only QScriptEngine main object
> > 
> > that made impossible among other things to register any non-qobject
> > class
> > or
> > global functions. Both are possible to be "reverted" in a quite hacky
> > way, but
> > so needed that made the hack acceptable to us, so now the QML based
> > plasmoids
> > can do all of the above without problems.
> > 
> > Talking with the PIM people we discovered they had all of the same
> > problems,
> > so we agreed with them to have a KDE-wide solution that would make easy
> > to anybody to use in a nice way what of kdelibs makes it so uhm,
> > kdelibs ;)
> > 
> > This library is basically a class, that after setting a
> > QDeclarativeEngine with initialize() pulls the qscriptengine out of it,
> > then replaces the main object with a writable copy.
> > 
> > the setupBindings() function (unsure if keeping this step optional or
> > just pput it into initialize()) binds in the main object goodies like
> > i18n, kjob,
> > kconfig, kicon and kurl.
> > 
> > at the moment it links to qtdeclarative, kdecore and kdeui (just for
> > kicon, if
> > QIcon::fromTheme works good enough perhaps we can keep kdeui out)
> > 
> > This would go in a (probably separate library) in kdelibs, making it
> > possible
> > to use from qml plasmoids as before or also in c++plasmoids or non
> > plasmoid ui
> > components of plasma (where we still don't have the same nice bindings)
> > but also from completely independent applications like Kontact
> > touch/calligra
> > mobile/whatever.
> > 
> > Cheers,
> > Marco Martin
> > _______________________________________________
> > Plasma-devel mailing list
> > Plasma-devel at kde.org
> > https://mail.kde.org/mailman/listinfo/plasma-devel
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