Comment by danappelxx | Hacker News Reader

Comment by danappelxx | Hacker News Reader

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Really cool work. My impression after reading the article is that it’s significantly inspired by SwiftUI, but without the magic annotations (@State, @Binding, @EnvironmentObject, @StateObject, etc.). It will be interesting to see how Rust handles the fully-statically-typed view tree, which has been really pushing the limits of the Swift compiler.

Question for the author: perhaps I missed it, but how do you plan to handle view trees that change based on state (ie SwiftUI’s IfElseView + viewbuilder)?

Good catch! Yes, the plan is to implement _ConditionalContent. It would look something like this:

    if_view(bool_predicate, || view1(...then...), || view2(...else...))

Whether we end up having a proc macro that has similar functionality as ViewBuilder in SwiftUI is an open question. For the time being, I'm seeing how far I can get with just vanilla Rust.

I'm generally pretty hopeful about the ability of the Rust compiler to handle big complex types, but it is a risk. There other projects out there that also stress it, and the compiler team is pretty serious about making this work well.

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