Init with @functionBuilder

[ay42]

Allow users to init Grid with function builder

Grid {
    Text("Item")
    Text("Item2")
}

[ay42]

This is related to #8
If anyone figured out how to do this please let me know.

[TilBlechschmidt]

Looks like this could be relevant:
https://developer.apple.com/documentation/swiftui/viewbuilder
Will investigate further.

[ay42]

@TilBlechschmidt we were able to init it with function builder in previous release
https://github.com/spacenation/grid/blob/eafea07725c1172fe630d6724bd6edac06bef728/Sources/Grid/Grid.swift#L10-L14
But the difficulty here is to process view builder directly like so:

public init(@ViewBuilder content: () -> Content) { ? }

Grid {
    Text("1")
}

[hmerzin]

Hi! I would love to take this issue. Any advice on a good place to start?

[ay42]

@hmerzin Hi! This is as far as I have been able to take it

extension Grid {
    public init<Data: RandomAccessCollection, ID, Item: View>(@ViewBuilder content: () -> Content) where Content == ForEach<Data, ID, Item> {
        let views = content()
        self.items = views.data.map { AnyView(views.content($0)) }
    }
}

This allows to init grid like so:

Grid {
    ForEach(...)
}

I honestly have no idea how to achieve the behaviour of native elements like List, Group, HStack.
There it is possible to just do this and it works:

HStack {
    Text("1")
    Text("2")
}

It would be awesome if you can figure this out.

[hmerzin]

as luck would have it, I recall reading a blog post a few weeks agothat elaborates on function builders and how one might be able to harness that syntax, though I am not entirely sure if it is possible outside of a SwiftUI context, as I remember seeing a constraint on the syntax that I thought was a bit strange. Nevertheless, I will take a look and let you know what I find and if I can prototype a solution!

thanks,
Harry

[ay42]

@hmerzin Looks there is a way to do this (#29). It's not perfect but it's an API we are looking for. Is this something similar to what you wanted to implement? Let me know

[hmerzin]

@ay42 using @ViewBuilder was exactly the syntax that I was exploring for implementing this. I think I am pretty close, but basically I have just been fiddling with the initializer for HStack

[ay42]

#31 has improvements that address this issue as well.
I feel like we can close this.