Persistence of View/Model data

[vizia]

Persistence of View/Model data

[rhelmot]

Yes, I believe we have answered this pretty conclusively in the direction of "models and views should never persist through rebuilds".

[rhelmot]

How about this for cx.build?

fn build<T, FN: FnOnce(&mut Context) -> T, FU: FnOnce(&mut Context, &mut T)>(&mut self, new_builder: FN, update_builder: FU)

That way, we call new_builder if the data is being constructed for the first time and then insert the return value into the state, and we call update_builder with a mutable reference to the value already in the state if one exists.

[geom3trik]

fn build<T, FN: FnOnce(&mut Context) -> T, FU: FnOnce(&mut Context, &mut T)>(&mut self, new_builder: FN, update_builder: FU)

I do like this as it seems more consistent with the current API. But I think most of the time the update closure will be empty.

[geom3trik]

@rhelmot correct me if I'm wrong here but I think that this is no longer an issue thanks to #33?