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zntfdr/HierarchyList.swift

Last active Nov 24, 2020
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// Original article here: https://www.fivestars.blog/code/swiftui-hierarchy-list.html
import SwiftUI
struct FileItem: Identifiable {
let name: String
var children: [FileItem]?
var id: String { name }
static let spmData: [FileItem] = [
FileItem(name: ".gitignore"),
FileItem(name: "Package.swift"),
FileItem(name: "README.md"),
FileItem(name: "Sources", children: [
FileItem(name: "fivestars", children: [
FileItem(name: "main.swift")
]),
]),
FileItem(name: "Tests", children: [
FileItem(name: "fivestarsTests", children: [
FileItem(name: "fivestarsTests.swift"),
FileItem(name: "XCTestManifests.swift"),
]),
FileItem(name: "LinuxMain.swift")
])
]
}
struct ContentView: View {
let data: [FileItem]
var body: some View {
// List(data, children: \.children, rowContent: { Text($0.name) })
HierarchyList(data: data, children: \.children, rowContent: { Text($0.name) })
}
}
public struct HierarchyList<Data, RowContent>: View where Data: RandomAccessCollection, Data.Element: Identifiable, RowContent: View {
private let recursiveView: RecursiveView<Data, RowContent>
public init(data: Data, children: KeyPath<Data.Element, Data?>, rowContent: @escaping (Data.Element) -> RowContent) {
self.recursiveView = RecursiveView(data: data, children: children, rowContent: rowContent)
}
public var body: some View {
List {
recursiveView
}
}
}
private struct RecursiveView<Data, RowContent>: View where Data: RandomAccessCollection, Data.Element: Identifiable, RowContent: View {
let data: Data
let children: KeyPath<Data.Element, Data?>
let rowContent: (Data.Element) -> RowContent
var body: some View {
ForEach(data) { child in
if let subChildren = child[keyPath: children] {
DisclosureGroup(content: {
RecursiveView(data: subChildren, children: children, rowContent: rowContent)
}, label: {
rowContent(child)
})
} else {
rowContent(child)
}
}
}
}
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