[Development] QML engine C++ class renaming

Thiago Macieira thiago.macieira at intel.com
Wed Feb 15 10:44:46 CET 2012

On quarta-feira, 15 de fevereiro de 2012 18.59.45, Alan Alpert wrote:
> > Q followed by lowercase letters used to be reserved for third-party
> > implementations. The Q in Qt classes means Qt itself, it's not the first
> > letter in another acronym. So these classes should actually be called
> > "QQml".
> The Q in QML means Qt itself. I'd be happy with QMlEngine if that floats
> your boat (except we probably aren't renaming everything again just to
> change capitalization :P ).

In "QmlFoo", the first three letters refer to the acronym or technology name 
"QML", otherwise the m wouldn't be lowercase. I don't think we want to expand 
the M because the word it stands for is just marketing and has little to do 
with what the language is.

To be honest, QMLEngine is better than QmlEngine.

> The two theoretical cases which might have been compatible are non-graphical
> QML libraries (which I don't think exist yet) and really dumb QML launchers
> (which still probably should make a conscious switch to scenegraph as it
> involves a fundamental change in rendering that you ought to be prepared
> for).

Understood, thanks for clarifying.

> > One final question: is it possible for the Qt Quick 1 module to use the
> > Quick 2 language module (QT += qml) and simply wrap it with its
> > QDeclarative classes, retaining compatibility?
> There have been some incompatible changes, such as moving the local storage
> API out of the engine. While they haven't been that many, it would certainly
> not be a simple wrapping and you'd also lose a lot of 'bug compatibility'
> (in the 'behaviour change sense', not the 'stopped crashing' sense).

Ok. How does that affect the API and not the language itself?

How big are the Qt Quick 1 language support classes? I'm asking so we can have 
an idea of how much maintenance effort those classes will be. I assume that 
they will continue to use V8, which will be continually updated and modified to 
support Qt Quick 2 and that introduces risk of regressions and breakages.

Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center
     Intel Sweden AB - Registration Number: 556189-6027
     Knarrarnäsgatan 15, 164 40 Kista, Stockholm, Sweden
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