ubuntu-phone team mailing list archive

[Zoltán Balogh <zoltan.balogh@xxxxxxxxxxxxx>]

I assume, that your experience comes from QtQuick1 and not from QtQuick2.

QtQuick2 with the v8 JS engine is much better.

What you describe was the right rule with Qt 4.8 and QtQuick1. I 
remember the struggling with QML when the N9's applications were 
developed. By then, on that hardware using pure QML was wrong idea. Time 
has passed.

I can promise that choosing C++/QML hybrid model as start will not be 
impossible or complicated. It is your choice. All I say that using C++ 
from the start will be slower, more expensive than starting with pure QML.

The problems of cross compilation is just one of the issues. If you 
stick to QML/JS then you can test your code on your Ubuntu desktop and 
the same code will just work the same way on Ubuntu phone. I think it is 
a significant benefit.

Zoltan



On 02/13/2013 05:46 PM, ajalkane wrote:
> My experience is that pure QML/JS solution is suitable to only quite 
> simple applications. I have myself found the best practice to be to do 
> the UI part in QML/JS, and have the "business logic" and models in 
> C++. In fact, for portability between platforms I think doing as 
> little as possible in QML is preferrable. Ie. it should contain only 
> the UI code.
>
> Your mileage may vary, and I'm certainly looking forward how this 
> approach works... but I do hope implementing a C++ backend is still 
> possible and not something that's overly complicated or impossible. 
> C++ plugins are perhaps more (coding) overhead in many cases than 
> should be necessary.
>
>
> On Wed, Feb 13, 2013 at 5:27 PM, Zoltán Balogh 
> <zoltan.balogh@xxxxxxxxxxxxx <mailto:zoltan.balogh@xxxxxxxxxxxxx>> wrote:
>
>     Hello Frank,
>
>     Please bother the SDK team :) the best what you and any Ubuntu
>     Phone application developer can do is to bother us with questions
>     and suggestions.
>
>     Actually the QML/JS does not rule out the finely crafted C++
>     plugins. Just the opposite!
>
>     We expect finely  crafted C++ plugins designed in a generic way so
>     they could be reused by other applications and they could be
>     contributed to the SDK. What we do not suggest is to use C++ where
>     pure QML offers a viable solution.
>
>     The shift from a procedura to a declarative programming mind is
>     not necessarily trivial for a coder who have been doing C++ apps
>     for years. That is why I would suggest to all Ubuntu Phone app
>     developers to start with small and easy applications and discover
>     the strength of the declarative programming.
>
>     Just translating a Qt/C++ code to QML/JS might not lead to the
>     best results.
>
>     cheers,
>
>     Zoltán
>
>
>
>
>
>     On 02/13/2013 03:30 PM, Frank Mertens wrote:
>
>         -----BEGIN PGP SIGNED MESSAGE-----
>         Hash: SHA1
>
>         Hi David,
>
>         thanks for the quick answer. I guess I'm trying to rewrite my
>         C++ models in JS then.
>         Let's see how much we can get out of QML/V8 when the first
>         phone image is released.
>         Thereafter we can then have a flame war on if we go purely
>         QML/JS or have lots
>         of finely crafted C++ plugins;) Until then don't bother the
>         SDK team to much! I really appreciate
>         the progress with the ubuntu-components -- gives me sleepless
>         nights, when I think what I could
>         do with these.
>
>         Greetings,
>         Frank
>
>         - -- gplus.to/frankencode <http://gplus.to/frankencode>
>         frankencode@freenode
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>         Comment: Using GnuPG with undefined - http://www.enigmail.net/
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>
>
>
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