[Interest] QtQuick import question

Jérôme Godbout jerome at bodycad.com
Thu Apr 13 15:01:24 CEST 2017

I guess it depends on what software you do, if you target open reusable
library, go with minimal number so as many version as possible can be used
along with it.

If you do proprietary software and you alone control the source, go with
the latest version as it will likely be more future proof and you will test
less version in the end.

I think the version that match Qt version would have been nice, but again
QtQuick.Controls 1.x and 2.x show another story, you still can use the old
way and the new way at the same time. But there again a new name would have
works too.

The version are particularly useful if dealing with Loader/Instanciator and
external inputs that may have a version too. You can create a component
with the right version and instantiate it to generate the proper

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Jerome Godbout
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On Thu, Apr 13, 2017 at 4:12 AM, Viktor Engelmann <viktor.engelmann at qt.io>

> The _version_ only affects which properties/methods are visible, so you
> should always go for the minimal version that has all the interfaces you
> use.
> say there is a qml class foo. in version 1.0 it has method bar, in 1.1 it
> also has method ham and in 1.2 method eggs.
> if you import 1.2 although you only use bar and ham, it won't run on
> systems that only have version 1.1 although it could. On systems that have
> 1.2, you still have all the bugfixes that went into bar and ham between 1.1
> and 1.2 - again, the version only affects which parts of the interface are
> visible.
> Viktor
> p.s. I don't think that other languages "get away without having a
> version". In other languages, you only push the trouble onto someone else.
> So you have for example a windows 9x, a win NT, a win vista,... version of
> your program and the customer must know which windows version he has (plus
> you need to bundle all the non-OS libraries you use, polluting the
> customers hard drive). And that approach only works for OSes that have a
> very limited set of releases, which isn't the case for linux.
> On linux, it's the packagers' job to know which version of which library
> has which interface. That's why you have versioned dependencies in .deb
> packages for example (and that makes things a lot more difficult without
> any benefit).
> On 13.04.2017 08:48, Elvis Stansvik wrote:
> Den 13 apr. 2017 2:52 fm skrev "Jason H" <jhihn at gmx.com>:
> >
> >
> >
> > > Sent: Wednesday, April 12, 2017 at 12:05 PM
> > > From: "VStevenP via Interest" <interest at qt-project.org>
> > > To: interest at qt-project.org
> > > Subject: [Interest] QtQuick import question
> > >
> > > When importing a QtQuick version, is it best to import the most recent
> version, or the minimum version that supports the features (properties,
> etc.) of the components being used?
> >
> > I've asked this before as well, I don't remember getting an answer. I go
> with whatever the documentation for the Qt version I'm using says, because
> there is no substantive table of what is in what version.
> >
> > I'd love to use min version, but sometimes you just don't know. Also,
> there is no clear reason (that I can tell) to have a version.  I think it
> would be nightmareish if Qt backeded every version of QML import that is
> actually listed in my app, so I assume the version is min version.  Every
> other language gets away without having a version, I wonder why Qt requires
> it in the source?
> +10, I would love if in our Quick application, we could just say "this is
> the minimum Qt version we support" and avoid having to specify cryptic
> versions on each QML import.
> The lack of docs on when/in which Qt version a particular QML version of a
> certain module was added doesn't help.
> Elvis
> >
> >
> >
> >
> > _______________________________________________
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> Viktor Engelmann
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