[Interest] Exposing types to the QJSEngine in Qt 5.5

[Jaroslaw Staniek]

Hi Again,
No thoghts about the matter?

>From https://wiki.qt.io/New_Features_in_Qt_5.5:
"You can now have Q_PROPERTY and Q_INVOKABLE within a Q_GADGET [...]"

But there's no QJSEngine::newQGadget() so is my only solution is the
pre-QtScript glue code like this heavier class?

// exposes RealObject::text() getter
class Wrapper : public QObject
{
Q_OBJECT
public:
    Wrapper(RealObject *parent) : m_real(parent) {}
    Q_INVOKABLE QString text() const { return m_real->text(); }

private:
    RealObject m_real;
};

// ...
Wrapper *w = ...
engine.globalObject().setProperty("element", engine.newQObject(w));


On 9 July 2015 at 10:26, Jaroslaw Staniek <staniek at kde.org> wrote:
> Hi,
> Big thanks to Simon and others for time spent on exposing types to the
> qml/js engines.
> And to Arend van Beelen for input.
>
> The story continues. In an app I am suppoting .js scripts, not .qml.
> Do I understand it well that with using QJSEngine (not QQmlEngine) for
> value types I can use code like "new Actor()" in my scripts? (Actor is
> a qgadget based
> http://doc.qt.io/qt-5/qtqml-cppintegration-data.html#value-types)
>
> After upgrading to 5.5 I am still getting "ReferenceError: Actor is not defined"
>
> Adding qRegisterMetaType<Actor>() prior to engine instantiation does not help.
> How does the QJSEngine::toScriptValue() help?
> I'd like to know more than the explanation at
> https://bugreports.qt.io/browse/QTBUG-29769 or
> https://codereview.qt-project.org/#/c/100347/ :)
> I see that autotests in the Simon's patch only cover qml scripts, so I
> am bit afraid what I'll hear :)
>
> I feel the documentation about exposing constructors is a bit lacking.
> There's a "Making a QObject Available to the Script Engine"
> [http://doc.qt.io/qt-5/qtjavascript.html] but it's for instances; it
> would be useful to also cover an 'official' way of exposing types.
> Sometimes it's good to read what's not supported in addition to what
> is supported. Especially it would be welcome for people coming from
> the QtScript world.
>
> --
> regards, Jaroslaw Staniek
>
> KDE:
> : A world-wide network of software engineers, artists, writers, translators
> : and facilitators committed to Free Software development - http://kde.org
> Calligra Suite:
> : A graphic art and office suite - http://calligra.org
> Kexi:
> : A visual database apps builder - http://calligra.org/kexi
> Qt Certified Specialist:
> : http://www.linkedin.com/in/jstaniek



-- 
regards, Jaroslaw Staniek

KDE:
: A world-wide network of software engineers, artists, writers, translators
: and facilitators committed to Free Software development - http://kde.org
Calligra Suite:
: A graphic art and office suite - http://calligra.org
Kexi:
: A visual database apps builder - http://calligra.org/kexi
Qt Certified Specialist:
: http://www.linkedin.com/in/jstaniek