Changing engine properties inside slots

[flanfly]

I'm looking into replacing qmlrs with qml-rust in one of my projects. The backend of the application exposes its data using a bunch of QListModel instances to the fontend written in QML. When to user kicks off an action the QML side calls a slot of a singleton object. The slot handler code on the Rust side will do his thing and then update some of the QListModel instances and return. My problem is that I can't figure out how to get a hold of a reference to the QListModels. I tried to make them properties of the singleton which failed, I also had the idea to put the QmlEngine instance into a global static RwLock. Any ideas?

[White-Oak]

@flanfly Well, one of my app (it's pretty simple) Kefia uses QListModel as a data storage.

It uses a following approach:

• There is a field list in a Packages struct which is essentially a QListModel instance inside. (It is generated though Q_LIST_MODEL macro here
• When user interacts with a list, QML rings a slot of QPackages (that is a wrapper on the Packages struct).
• Rust code modifies a list with a calculated data via set_data So, the QListModel instance should be stored inside a model, but not as a property, but as a field of a struct.

That is what we have for now. I hope I described it okayish.

[White-Oak]

Also, properties are supported, but it is not really comfortable to use them due to limitations of macro system on stable Rust.

[flanfly]

Thanks for the quick answer! I did not know I have to write list instead of QListModel into the macro. I'll try that.

[White-Oak]

@flanfly you don't have to name it list, actually, any valid Rust identifier is good. Here are the docs with an example

[flanfly]

I got it to work, thanks.