118 lines
3.2 KiB
Swift
118 lines
3.2 KiB
Swift
//
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// FeatureDetailView.swift
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// Delta
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//
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// Created by Riley Testut on 4/10/23.
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// Copyright © 2023 Riley Testut. All rights reserved.
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//
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import SwiftUI
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import DeltaFeatures
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struct FeatureDetailView<Feature: AnyFeature>: View
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{
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@ObservedObject
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var feature: Feature
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var body: some View {
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Form {
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Section {
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Toggle(isOn: $feature.isEnabled.animation()) {
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Text(feature.name)
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.bold()
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}
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} footer: {
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if let description = feature.description
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{
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Text(description)
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}
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}
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if feature.isEnabled
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{
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ForEach(feature.allOptions, id: \.key) { option in
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if let optionView = optionView(option)
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{
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Section {
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optionView
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} footer: {
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if let description = option.description
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{
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Text(description)
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}
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}
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}
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}
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}
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}
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}
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// Cannot open existential if return type uses concrete type T in non-covariant position (e.g. Box<T>).
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// So instead we erase return type to AnyView.
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private func optionView<T: AnyOption>(_ option: T) -> AnyView?
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{
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guard let view = OptionRow(option: option) else { return nil }
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return AnyView(view)
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}
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}
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private struct OptionRow<Option: AnyOption, DetailView: View>: View where DetailView == Option.DetailView
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{
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var name: LocalizedStringKey
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var value: any LocalizedOptionValue
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var detailView: DetailView
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@State
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private var displayInline: Bool = false
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init?(option: Option)
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{
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// Only show if option has a name, localizable value, and detailView.
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guard
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let name = option.name,
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let value = option.value as? any LocalizedOptionValue,
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let detailView = option.detailView()
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else { return nil }
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self.name = name
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self.value = value
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self.detailView = detailView
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}
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var body: some View {
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VStack {
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if displayInline
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{
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// Display entire view inline.
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detailView
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}
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else
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{
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let wrappedDetailView = Form {
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detailView
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}
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NavigationLink(destination: wrappedDetailView) {
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HStack {
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Text(name)
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Spacer()
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value.localizedDescription
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.foregroundColor(.secondary)
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}
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}
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.overlay(
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// Hack to ensure displayInline preference is in View hierarchy.
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detailView
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.hidden()
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.frame(width: 0, height: 0)
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)
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}
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}
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.onPreferenceChange(DisplayInlineKey.self) { displayInline in
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self.displayInline = displayInline
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}
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}
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}
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