[Interest] Accessing attached properties from C++

[Oleg Shparber]

Hi all,

I am trying to get access to attached properties of QQuickItems. I have
faced to problems.

1. Attempt to get or create a new Component property on any item returns
zero pointer:

qDebug() <<
qobject_cast<QQmlComponentAttached*>(qmlAttachedPropertiesObject<QQmlComponentAttached>(item));

2. When I am trying to access KeyNavigation property

qDebug() <<
qobject_cast<QQuickKeyNavigationAttached*>(qmlAttachedPropertiesObject<QQuickKeyNavigationAttached>(item));

results in unloadable plugin because of unmet reference:

undefined symbol: _ZN27QQuickKeyNavigationAttached16staticMetaObjectE)

In my .pro file I've added: QT += qml qml-private quick quick-private
core-private gui-private

I don't understand what I am doing wrong. According to qtdeclarative
sources I do everything properly.

Thanks,
Oleg
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