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| 1 | +import SwiftUI |
| 2 | + |
| 3 | +struct SidebarItem: Identifiable, Equatable { |
| 4 | + var id: Int { tag } |
| 5 | + var tag: Int |
| 6 | + var title: String |
| 7 | + var subtitle: String? = nil |
| 8 | + var image: String? = nil |
| 9 | +} |
| 10 | + |
| 11 | +struct SidebarItemPreferenceKey: PreferenceKey { |
| 12 | + static var defaultValue: [SidebarItem] = [] |
| 13 | + static func reduce(value: inout [SidebarItem], nextValue: () -> [SidebarItem]) { |
| 14 | + value.append(contentsOf: nextValue()) |
| 15 | + } |
| 16 | +} |
| 17 | + |
| 18 | +extension View { |
| 19 | + func sidebarItem( |
| 20 | + tag: Int, |
| 21 | + currentTag: Int, |
| 22 | + title: String, |
| 23 | + subtitle: String? = nil, |
| 24 | + image: String? = nil |
| 25 | + ) -> some View { |
| 26 | + return opacity(tag != currentTag ? 0 : 1) |
| 27 | + .background(GeometryReader { _ in |
| 28 | + Color.clear.preference( |
| 29 | + key: SidebarItemPreferenceKey.self, |
| 30 | + value: [.init(tag: tag, title: title, subtitle: subtitle, image: image)] |
| 31 | + ) |
| 32 | + }) |
| 33 | + } |
| 34 | +} |
| 35 | + |
| 36 | +struct SidebarTabView<Content: View>: View { |
| 37 | + @State var sidebarItems = [SidebarItem]() |
| 38 | + @Binding var tag: Int |
| 39 | + @ViewBuilder var views: (_ tag: Int) -> Content |
| 40 | + var body: some View { |
| 41 | + HStack(spacing: 0) { |
| 42 | + ScrollView { |
| 43 | + VStack(alignment: .leading) { |
| 44 | + ForEach(sidebarItems) { item in |
| 45 | + Button(action: { |
| 46 | + tag = item.tag |
| 47 | + }) { |
| 48 | + HStack { |
| 49 | + if let image = item.image { |
| 50 | + Image(systemName: image) |
| 51 | + .resizable() |
| 52 | + .scaledToFit() |
| 53 | + .frame(height: 20) |
| 54 | + } |
| 55 | + VStack(alignment: .leading) { |
| 56 | + Text(item.title) |
| 57 | + .foregroundStyle(.primary) |
| 58 | + if let subtitle = item.subtitle { |
| 59 | + Text(subtitle) |
| 60 | + .font(.caption) |
| 61 | + .foregroundStyle(.tertiary) |
| 62 | + .opacity(0.5) |
| 63 | + } |
| 64 | + } |
| 65 | + } |
| 66 | + .frame(maxWidth: .infinity, alignment: .leading) |
| 67 | + .padding(.horizontal, 8) |
| 68 | + .padding(.vertical, 4) |
| 69 | + .background( |
| 70 | + Color.primary.opacity(tag == item.tag ? 0.1 : 0), |
| 71 | + in: RoundedRectangle(cornerRadius: 4) |
| 72 | + ) |
| 73 | + .padding(.horizontal, 8) |
| 74 | + } |
| 75 | + .buttonStyle(.borderless) |
| 76 | + } |
| 77 | + } |
| 78 | + .frame(width: 200) |
| 79 | + .padding(.vertical, 8) |
| 80 | + } |
| 81 | + .background(Color.primary.opacity(0.05)) |
| 82 | + |
| 83 | + Divider() |
| 84 | + |
| 85 | + ZStack(alignment: .topLeading) { |
| 86 | + views(tag) |
| 87 | + } |
| 88 | + } |
| 89 | + .onPreferenceChange(SidebarItemPreferenceKey.self) { items in |
| 90 | + sidebarItems = items |
| 91 | + } |
| 92 | + } |
| 93 | +} |
| 94 | + |
| 95 | +struct SidebarTabView_Previews: PreviewProvider { |
| 96 | + static var previews: some View { |
| 97 | + SidebarTabView(tag: .constant(0)) { tag in |
| 98 | + Color.red.sidebarItem( |
| 99 | + tag: 0, |
| 100 | + currentTag: tag, |
| 101 | + title: "Hello", |
| 102 | + subtitle: "Meow", |
| 103 | + image: "person.circle.fill" |
| 104 | + ) |
| 105 | + Color.blue.sidebarItem( |
| 106 | + tag: 1, |
| 107 | + currentTag: tag, |
| 108 | + title: "World", |
| 109 | + image: "person.circle.fill" |
| 110 | + ) |
| 111 | + Color.blue.sidebarItem( |
| 112 | + tag: 3, |
| 113 | + currentTag: tag, |
| 114 | + title: "Pikachu", |
| 115 | + image: "person.circle.fill" |
| 116 | + ) |
| 117 | + } |
| 118 | + } |
| 119 | +} |
| 120 | + |
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