Hi, I'm still gathering around TornadoFX. I'm curr...

# tornadofx

[romainbsl]

Hi, I'm still gathering around TornadoFX. I'm currently playing with ViewModels and bindings.

One thing I noticed, is that depending on the origin of the object binding doesn't work as I expect.
If this is normal, please tell me, I'll be glad to know how it really works.

I got a POJO that I try to bind with an ItemViewModel

public class PersonJava {
        private String name;
        private String title;
        // and so on...
    }
    class PersonJavaModel : ItemViewModel<PersonJava>() {
        val name = bind { item?.observable(PersonJava::getName, PersonJava::setName) }
        val title = bind { item?.observable(PersonJava::getTitle, PersonJava::setTitle) }
    }

This works pretty well.

Now, I tried to do the same with a data class

data class PersonKotlin(var name: String? = null, var title: String? = null)

    class PersonKotlinModel : ItemViewModel<PersonKotlin>() {
        val name = bind { item?.observable(PersonKotlin::name) }
        val title = bind { item?.observable(PersonKotlin::title) }
    }

Here the bind function doesn't agree because my props are nullable.
But why does this work with POJOs ? they nullable too.
+ I tried to put the annotation @nullable on my POJO's props and this end with a compile exepction like with my data class, because my getters retrieve String? instead of String!, the type inference does its job here.

With my POJO I still can manipulate instances with null values in my UI and this works fine.
So why I cannot use nullable values with data classes and ItemViewModel ?