Modal navigation stack presentation detents

Sources/FuturedArchitecture/Architecture/ModalCoverModel.swift

@@ -1,13 +1,32 @@
 //
 //  ModalCoverModel.swift
-//  
+//
 //
 //  Created by Simon Sestak on 01/08/2024.
 //
 
+import SwiftUI
 import Foundation
 
-/// Style of the modally presented view. 
+
+public enum SheetDetent: Hashable {
+    case medium
+    case large
+    case fraction(CGFloat)
+
+    func detent() -> PresentationDetent {
+        switch self {
+        case .medium:
+            return .medium
+        case .large:
+            return .large
+        case let .fraction(fraction):
+            return .fraction(fraction)
+        }
+    }
+}
+
+/// Style of the modally presented view.
 ///
 /// It is intended to be used with ``ModalCoverModel``. Style has been placed to
 /// the global scope, since the Model is generic.

Sources/FuturedArchitecture/Architecture/NavigationStackFlow.swift

@@ -6,31 +6,34 @@ public struct NavigationStackFlow<Coordinator: NavigationStackCoordinator, Conte
     @StateObject private var coordinator: Coordinator
     @ViewBuilder private let content: () -> Content
 
+    /// Use in case when whole navigation stack should have detents.
+    @State private var navigationDetents: Set<PresentationDetent>?
+
     /// - Parameters:
+    ///   - detents: The set of detents which should be applied to the whole navigation stack.
     ///   - coordinator: The instance of the coordinator used as the model and retained as the ``SwiftUI.StateObject``
     ///   - content: The root view of this navigation stack. The ``navigationDestination(for:destination:)`` modifier
     ///   is applied to this content.
-    public init(coordinator: @autoclosure @escaping () -> Coordinator, content: @MainActor @escaping () -> Content) {
+    public init(
+        detents: Set<SheetDetent>? = nil,
+        coordinator: @autoclosure @escaping () -> Coordinator,
+        content: @MainActor @escaping () -> Content
+    ) {
+        self.navigationDetents = detents == nil ? nil : Set(detents!.map { $0.detent() })
         self._coordinator = StateObject(wrappedValue: coordinator())
         self.content = content
     }
 
-    #if os(macOS)
-    public var body: some View {
-        NavigationStack(path: $coordinator.path) {
-            content().navigationDestination(for: Coordinator.Destination.self, destination: coordinator.scene(for:))
-        }
-        .sheet(item: sheetBinding, onDismiss: coordinator.onModalDismiss, content: coordinator.scene(for:))
-    }
-    #else
     public var body: some View {
         NavigationStack(path: $coordinator.path) {
             content().navigationDestination(for: Coordinator.Destination.self, destination: coordinator.scene(for:))
         }
+        .presentationDetents(navigationDetents ?? [])
         .sheet(item: sheetBinding, onDismiss: coordinator.onModalDismiss, content: coordinator.scene(for:))
+        #if !os(macOS)
         .fullScreenCover(item: fullscreenCoverBinding, onDismiss: coordinator.onModalDismiss, content: coordinator.scene(for:))
+        #endif
     }
-    #endif
 
     private var sheetBinding: Binding<Coordinator.Destination?> {
         .init {