From 76f4a9a0fcdba9e5e4e3e7a91b78309ef6eaa410 Mon Sep 17 00:00:00 2001
From: "brunel.lee" <brunel.lee@kakaohealthcare.com>
Date: Fri, 5 Jan 2024 14:37:52 +0900
Subject: [PATCH] Add Binder for swiftui

---
 Sources/OneWay/Store.swift     |  2 +-
 Sources/OneWay/ViewStore.swift | 27 ++++++++++++++++++++++++++-
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/Sources/OneWay/Store.swift b/Sources/OneWay/Store.swift
index e8c3452..c92624e 100644
--- a/Sources/OneWay/Store.swift
+++ b/Sources/OneWay/Store.swift
@@ -40,7 +40,7 @@ where R.Action: Sendable, R.State: Sendable & Equatable {
 
     private let reducer: any Reducer<Action, State>
     private let continuation: AsyncStream<State>.Continuation
-    private var isProcessing: Bool = false
+    public private(set) var isProcessing: Bool = false
     private var actionQueue: [Action] = []
     private var bindingTask: Task<Void, Never>?
     private var tasks: [TaskID: Task<Void, Never>] = [:]
diff --git a/Sources/OneWay/ViewStore.swift b/Sources/OneWay/ViewStore.swift
index b5d7c09..4f6861e 100644
--- a/Sources/OneWay/ViewStore.swift
+++ b/Sources/OneWay/ViewStore.swift
@@ -26,7 +26,7 @@ where R.Action: Sendable, R.State: Sendable & Equatable {
     public let initialState: State
 
     /// The current state of a store.
-    public var state: State {
+    public private(set) var state: State {
         didSet {
             continuation.yield(state)
             states.send(state)
@@ -97,3 +97,28 @@ where R.Action: Sendable, R.State: Sendable & Equatable {
 #if canImport(Combine)
 extension ViewStore: ObservableObject { }
 #endif
+
+
+#if canImport(SwiftUI)
+import SwiftUI
+
+extension ViewStore {
+    func binding<T>(_ keyPath: WritableKeyPath<State, T>) -> Binding<T> {
+        Binding(
+            get: { self.state[keyPath: keyPath] },
+            set: { value in
+                Task {
+                    await self.store.justSetStateValue((value, keyPath))
+                }
+            }
+        )
+    }
+}
+
+extension Store {
+    fileprivate func justSetStateValue<T>(_ setter: (T, WritableKeyPath<State, T>)) {
+        guard !isProcessing else { return }
+        self.state[keyPath: setter.1] = setter.0
+    }
+}
+#endif