QQmlListProperty is read only

Leon_2001

Hello everyone,

I created a class with a QQmlListProperty following exactly this example. But anytime I want to fill the list with values from qml (as they also did in this example), I get an error "property is read-only".
From reading other Posts in the forum, it seems very likly that the the issue is that my type, which the QQmlListProperty stores, is not registered in qml.
Well, I am using this in a plugin, so I made both classes (the class with QQmlListProperty, and the class stores in this list) available with qmlRegisterType.

It's kind of hard to provide any source code, but I can't see any difference to the birthdayparty example except from the fact that it's a plugin.

I appreciate any help!

By the way, the birthdayparty example works.

raven-worx

@Leon_2001
did you really exactly implemented it like in the example?
the important line is:

QQmlListProperty<Person>(this, this,
             &BirthdayParty::appendGuest,
             &BirthdayParty::guestCount,
             &BirthdayParty::guest,
             &BirthdayParty::clearGuests);

If you leave out the BirthdayParty::appendGuest function pointer it will result in a read-only list.

@Leon_2001 said in QQmlListProperty is read only:

Well, I am using this in a plugin, so I made both classes (the class with QQmlListProperty, and the class stores in this list) available with qmlRegisterType.

you may also use QML_DECLARE_TYPE

Leon_2001

I tried to reproduce the problem without a plugin and I couldn't. That was the moment I realized, I forgot to make one class available to qml. It has pure virtual member functions, so qmlRegisterUncreatableType did the trick.

@raven-worx When should I use QML_DECLARE_TYPE? (What's the difference except from the fact that it's a macro?)

raven-worx

@Leon_2001 said in QQmlListProperty is read only:

When should I use QML_DECLARE_TYPE? (What's the difference except from the fact that it's a macro?)

did you click on the link?