alignment.swift

// Determine the alignment of every view in the ZStack
func zStackViews(_ geometry: GeometryProxy) -> some View {
    // These are used to track the current horizontal and vertical position
    // in the ZStack. As a new text or link is added, horizontal is decreased.
    // When a new line is required, vertical is decreased & horizontal is reset to 0.
    var horizontal: CGFloat = 0
    var vertical: CGFloat = 0

    // Determine the alignment for the view at the given index
    func forEachView(_ index: Int) -> some View {
        let numberOfViewsInContent: Int
        let view: AnyView

        // Determine the number of views in the Content at the given index
        switch content[index] {
        case .text(let text):
            numberOfViewsInContent = text.count
            view = AnyView(text)
        case .link(let link):
            numberOfViewsInContent = 1
            view = AnyView(link)
        }

        var numberOfViewsRendered = 0

        // Note that these alignment guides can get called multiple times per view
        // since ContentText returns a ForEach
        return view
            .alignmentGuide(.leading, computeValue: { dimension in
                numberOfViewsRendered += 1

                let viewShouldBePlacedOnNextLine = geometry.size.width < -1 * (horizontal - dimension.width)
                if viewShouldBePlacedOnNextLine {
                    // Push view to next line
                    vertical -= dimension.height
                    horizontal = -dimension.width
                    return 0
                }

                let result = horizontal

                // Set horizontal to the end of the current view
                horizontal -= dimension.width

                return result
            })
            .alignmentGuide(.top, computeValue: { _ in
                let result = vertical

                // if this is the last view, reset everything
                let isLastView = index == content.indices.last && numberOfViewsRendered == numberOfViewsInContent
                if isLastView {
                    vertical = 0
                    horizontal = 0
                    numberOfViewsRendered = 0
                }

                return result
            })
    }

    return ForEach(content.indices, content: forEachView)
}