[commonqt-devel] Re: Question abot CommonQt examples

[Stas Boukarev]

Rujia Liu <rujia.liu at gmail.com> writes:

> On Thu, Sep 12, 2013 at 3:31 AM, Stas Boukarev <stassats at gmail.com> wrote:
>
>> Indeed. But it looks like this sequence of code is repeated in all the
>> projects. So, I decided to make it easier.
>>
>> That's good! :)
>
>
>>
>> Good to hear that. Feel free to ask any questions, the documentation may
>> be lacking in some aspects.
>>
> I updated it to mention the above changes. And also added a description
>> on how to better connect signals and some additional information about
>> method overrides.
>
> Great. I've just experimented about ways to connect signals yesterday :)
> I also used with-objects macro, after comparing with C++ version and also
> looking at the macro's source code. I think the spirit is: if the C++
> version used a local object (implicit object construction and destroying),
> use with-objects; but if the C++ version used a pointer without deleting
> it, don't use with-objects. Correct me if I'm wrong, and I think this
> information is quite useful for new CommonQt users if you add it to the
> documentation.
>
> Another interesting thing is QVector's streaming operator:
>
> QPolygon polygon;
> polygon << QPoint(10, 20) << QPoint(20, 30);
>
> Of course it's not mandatory to use "<<" but it's convenient. Just curious:
> can we do it similarly in CommonQt?
>
> BTW: I'm talking about this because I use QPolygon in my project. It uses
> QGraphicsView heavily and everything is going on very well.
Template classes are problematic, there's no meta information like with
QObject, so it has to be marshalled explicitly, i.e. converted to a
vector, and then converted back, which may not be the most efficient
thing to do. There's currently no QVector<QPoint> marshalling, but it
can be added if needed.

P.S. For ordinary classes (#_<< x y z) works.
-- 
With best regards, Stas.