ubuntu-phone team mailing list archive

[Bruno Girin <brunogirin@xxxxxxxxx>]

That's what I was going to say. I was dubious about the all QML approach
until I had a look at the code in the notepad-qml app. In particular you
should check how the model has been implemented. The end result is an
application with well separated model, UI and components and not a line
of C++ in sight.

Bruno

On 13/02/13 17:26, Zoltán Balogh wrote:
> I recommend to check out the source of the notepad-qml app and the example/demo apps from the UI
Toolkit packages.
>
> Prettiness is :) very subjective, but in my opinion the code of these
apps are pretty.
>
> Portability was definitely a very important argument when we decided
to build the application development story of the Ubuntu Phone on
Quick2. Also the UI Toolkit the API compatibility was and is a top
priority: http://qt-project.org/wiki/QQUIComponentsComparison
>
> One important aspect of portability is how easy is to deploy the
application under development on a phone device or on any device. If you
stick to QML than it is a copy and a "run" command, but if you have C++
than you need to cross-compile the code, make sure that you link against
the right libraries, etc, etc ...
>
> Zoltán
>
>
> On 02/13/2013 05:59 PM, Nejc wrote:
>> I have to agree with ajalkane on this. Doing business logic in C++
also results in much prettier code. Data model management is also very
limited in QML. And it's not that I'm used to C++, I once tried doing as
much as possible in QML with non-satisfying results and I consider
myself experienced in QML.
>>
>> Another thing is, Ubuntu should aim at easy portability with other
QtQuick platforms. If only UI is written in QML, it's just easy UI
rewrite. Otherwise, you have to mess with your business logic code,
because it's integrated with UI.
>>
>> On 13. Feb 2013, at 16:46 , ajalkane <ajalkane@xxxxxxxxx
<mailto:ajalkane@xxxxxxxxx>> 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:
>>>
> 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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>>
>>
>>
>
>
>