struct TapGestureModifier: ViewModifier {
    var onTapGesture: () -> Void
    
    func body(content: Content) -> some View {
        content.onTapGesture {
            onTapGesture()
        }
    }
}

struct ContentView: View {
    var colors: [Color] = [.red, .orange, .yellow, .green, .blue]
    @State var selection: Int? = nil
    var isZoomedIn: Bool { selection != nil }
    
    var body: some View {
        ZoomNavigator(data: 0..<5, id: \.self, selection: selection) { i in
            VStack {
                Text("Hello \(i)")
                    .padding()
                Spacer()
                if isZoomedIn {
                    Text("I really like the number \(i)")
                }
            }
            .frame(maxWidth: .infinity)
        } background: { i in
            colors[i]
        } modifier: { i in
            TapGestureModifier {
                withAnimation {
                    if selection == nil {
                        self.selection = i
                    } else {
                        self.selection = nil
                    }
                }
            }
        }
    }
}