wip

Sources/_SwiftUINavigationState/ActionState.swift

@@ -0,0 +1,71 @@
+import SwiftUI
+
+public protocol ActionState {
+  associatedtype Action
+  associatedtype Body: View
+
+  func body(withAction perform: @escaping (Action) -> Void) -> Body
+}
+
+public struct AnyActionState<Action>: ActionState {
+  public typealias Action = Action
+
+  public typealias Body = AnyView
+
+  private let _body: (@escaping (Action) -> Void) -> AnyView
+
+  public init<S: ActionState>(_ state: S) where S.Action == Action {
+    self._body = { perform in
+      AnyView(state.body(withAction: perform))
+    }
+  }
+
+  public func body(withAction perform: @escaping (Action) -> Void) -> AnyView {
+    self._body(perform)
+  }
+}
+
+@resultBuilder
+public enum ActionStateBuilder<Action> {
+  public static func buildArray(
+    _ components: [[AnyActionState<Action>]]
+  ) -> [AnyActionState<Action>] {
+    components.flatMap { $0 }
+  }
+
+  public static func buildBlock(
+    _ components: [AnyActionState<Action>]...
+  ) -> [AnyActionState<Action>] {
+    components.flatMap { $0 }
+  }
+
+  public static func buildLimitedAvailability(
+    _ component: [AnyActionState<Action>]
+  ) -> [AnyActionState<Action>] {
+    component
+  }
+
+  public static func buildEither(
+    first component: [AnyActionState<Action>]
+  ) -> [AnyActionState<Action>] {
+    component
+  }
+
+  public static func buildEither(
+    second component: [AnyActionState<Action>]
+  ) -> [AnyActionState<Action>] {
+    component
+  }
+
+  public static func buildExpression(
+    _ expression: AnyActionState<Action>
+  ) -> [AnyActionState<Action>] {
+    [expression]
+  }
+
+  public static func buildOptional(
+    _ component: [AnyActionState<Action>]?
+  ) -> [AnyActionState<Action>] {
+    component ?? []
+  }
+}

Sources/_SwiftUINavigationState/ButtonState.swift

@@ -93,6 +93,13 @@ public struct ButtonState<Action>: Identifiable {
   }
 }
 
+@available(iOS 15, macOS 12, tvOS 15, watchOS 8, *)
+extension ButtonState: ActionState {
+  public func body(withAction perform: @escaping (Action) -> Void) -> some View {
+    Button(self, action: perform)
+  }
+}
+
 extension ButtonState: CustomDumpReflectable {
   public var customDumpMirror: Mirror {
     var children: [(label: String?, value: Any)] = []

Sources/_SwiftUINavigationState/TextFieldState.swift

@@ -0,0 +1,95 @@
+import SwiftUI
+
+@available(iOS 15.0, *)
+struct MyView: View {
+  enum AlertAction {
+    case usernameChanged(String)
+    case passwordChanged(String)
+    case loginButtonTapped
+  }
+
+  @State var alert: AlertState<AlertAction>?
+  @State var username = ""
+  @State var password = ""
+
+  var body: some View {
+    Button("Tap") {
+      self.alert = AlertState {
+        TextState("Log in")
+      } actions: {
+        TextFieldState(action: /AlertAction.usernameChanged) {
+          Text("blob@pointfree.co")
+        }
+        SecureFieldState(action: /AlertAction.passwordChanged) {
+          Text("••••••••")
+        }
+        ButtonState("")
+      }
+
+
+
+    }
+    .alert(
+      "Authentication required",
+      isPresented: Binding(
+        get: { self.alert != nil },
+        set: { isPresented in
+          if !isPresented {
+            self.alert = nil
+          }
+        }
+      )
+    ) {
+
+    } message: {
+      Text("Please enter your login details.")
+    }
+  }
+}
+
+import CasePaths
+import SwiftUI
+
+@available(iOS 16, macOS 13, tvOS 16, watchOS 8, *)
+public struct TextFieldState<Action> {
+  public let initialText: String
+  public let action: CasePath<Action, String>
+  public let label: TextState
+
+  public init(
+    initialText: String = "",
+    action: CasePath<Action, String>,
+    label: () -> TextState
+  ) {
+    self.initialText = initialText
+    self.action = action
+    self.label = label()
+  }
+}
+
+@available(iOS 16, macOS 13, tvOS 16, watchOS 8, *)
+extension TextFieldState: ActionState {
+  public typealias Value = String
+
+  public func body(withAction perform: @escaping (Action) -> Void) -> some View {
+    TextField(self, action: perform)
+  }
+}
+
+@available(iOS 16, macOS 13, tvOS 16, watchOS 8, *)
+extension TextField where Label == Text {
+  public init<Action>(_ state: TextFieldState<Action>, action: @escaping (Action) -> Void) {
+    var text = state.initialText
+    self.init(
+      text: Binding(
+        get: { text },
+        set: { newText in
+          text = newText
+          action(state.action.embed(newText))
+        }
+      )
+    ) {
+      Text(state.label)
+    }
+  }
+}