[Development] The place of QML

Peter Kümmel syntheticpp at gmx.net
Thu May 17 18:24:29 CEST 2012

On 17.05.2012 12:35, Atlant Schmidt wrote:
> Peter, et al.:
>> We don't wanna use obsolete stuff with a "architecture from
>> the 90s" in times where "graphical technology has moved on" (Thiago).
>    Computer architectures don't necessarily "become obsolete".
>    Oh, trends come and trends go, but the fundamental concepts
>    go on forever. For example, Linux is quite popular even
>    though it is arguably a "computer architecture from 1970".
>    Often, the proponents arguing for "new and improved" are
>    simply arguing for the position they think will be most fun
>    to work on; after all, it's always more fun to break exciting
>    new ground than it is to have trod the same old sod yet again.
>    But many of these new approaches are just "fashion" and if you
>    wait a few years, fashions will change again and "old and
>    obsolete" will be back in fashion (and often, simply because
>    good sense has returned to the design community).
>> Most people don't care what happens under the hood (QWidget
>> or QML) when good desktop support is available.
>    And some of us *DO* care very much what goes on under the
>    hood. Me, I live in an embedded world running on a ~450 MHz
>    processor with very limited RAM and graphics. There's just
>    enough "stuff" there to make the traditional Qt approach
>    work (just barely) but if the only choice Qt intends to
>    offer me in the future is going to burden me with the
>    overhead of a JavaScript (or even web) runtime, then I'm
>    going to need a new graphical framework.
>    Old and obsolete worked for me; New and improved (in this
>    case) clearly isn't likely to.

Then Qt Widgets is perfect for you: mature, stable API. You
only would have a problem when you have to implement features
which are much better supported by QML.

>                         Atlant
> -----Original Message-----
> From: development-bounces+aschmidt=dekaresearch.com at qt-project.org [mailto:development-bounces+aschmidt=dekaresearch.com at qt-project.org] On Behalf Of Peter Kümmel
> Sent: Thursday, May 17, 2012 02:12
> To: development at qt-project.org
> Subject: Re: [Development] The place of QML
> On 16.05.2012 20:31, qtnext wrote:
>> I am using Qt since 12 years or more... I have done a lot of work using qwidget, qgraphiscview, ....
>> I have done some small apps with qml to display media : it works very well ... just the animation are a a litlle bit
>> jerky and work not well on very small computer ...
>> But now that Qt5 is here : the alpha seems very promising regarding performance ... and I have started a new big desktop
>> application and I plan to use only Qml and it seems very promising .. I am sure that Quick2 is the way for new desktop
>> application : We only need Qt desktop components, treeview, ... and it will rocks :)
> Yes, that's the point. Most people don't care what happens under the hood (QWidget or QML)
> when good desktop support is available. But currently for desktop apps you have the choice
> between a "obsolete architecture" (Thiago) and an incomplete QML stack.
> Non technicians don't care about if QWidget is done or not if it fits the needs,
> but we are developers! We don't wanna use obsolete stuff with a
> "architecture from the 90s" in times where "graphical technology has moved on" (Thiago).
> But on the desktop we are forced to when we wanna a feature rich/complete framework.
> So all the QML<->QWidget discussions are mainly because there is no complete Qml support on the desktop.
> Desktop support has no high priority more anywhere.
> It couldn't be so complex to make good Qml support on the desktop, simply throw
> 5 man years on it (shouldn't be impossible when there are already 200 Qt developers
> at Nokia alone). But it doesn't happen because nobody wanna invest in the desktop.
> So all you can do is using a system with a "obsolete architecture", diving deep
> into QML and writing your own desktop elements, or waiting another one or two years.
> And I don't like any of the options.
> Peter
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