From 44be658ae857f35c86eda6309d03afb960551a80 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Junnos=20=EF=A3=BF?= <junnos.dev@gmail.com>
Date: Sat, 5 Oct 2024 22:25:27 +0900
Subject: [PATCH] =?UTF-8?q?=E2=9C=A8=20Add=20support=20for=20`Binding`=20u?=
 =?UTF-8?q?sing=20SwiftUI?=
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---
 Examples/Counter/Counter/Counter.swift | 14 ++++++++++++--
 Sources/Dripper/Station.swift          | 14 ++++++++++++++
 2 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/Examples/Counter/Counter/Counter.swift b/Examples/Counter/Counter/Counter.swift
index 390c831..85d066a 100644
--- a/Examples/Counter/Counter/Counter.swift
+++ b/Examples/Counter/Counter/Counter.swift
@@ -19,6 +19,7 @@ struct Counter: Dripper {
     @Observable
     final class State {
         var counter: Int = .zero
+        var text = ""
     }
 
     enum Action {
@@ -40,13 +41,14 @@ struct Counter: Dripper {
             case .resetCounter:
                 state.counter = .zero
             case .randomNumber:
-                return .run { pour in
+                return .run { _ in
                     func randomNumber() async throws -> Int {
                         try await Task.sleep(for: .seconds(1))
                         return Int.random(in: 0...10)
                     }
                     let randomNumber = try await randomNumber()
-                    await pour(.decreaseCounter)
+                    // FIXME: Data Race
+//                    await pour(.decreaseCounter)
                     state.counter = randomNumber
                 }
             }
@@ -103,6 +105,14 @@ struct CounterView: View {
             .padding()
             .background(.regularMaterial)
             .clipShape(.rect(cornerRadius: 10.0))
+
+            TextField(text: station.bind(\.text)) {
+                Text("Enter you name here")
+            }
+            .textFieldStyle(.roundedBorder)
+            .padding()
+
+            Text(station.text)
         }
         .font(.headline)
     }
diff --git a/Sources/Dripper/Station.swift b/Sources/Dripper/Station.swift
index 33731fe..721268d 100644
--- a/Sources/Dripper/Station.swift
+++ b/Sources/Dripper/Station.swift
@@ -6,6 +6,7 @@
 //
 
 import Foundation
+import SwiftUI
 
 public typealias StationOf<D: Dripper> = Station<D.State, D.Action>
 
@@ -70,3 +71,16 @@ public final class Station<State: Observable, Action> {
         }
     }
 }
+
+extension Station where State: AnyObject {
+    public func bind<Member>(_ dynamicMember: WritableKeyPath<State, Member>) -> Binding<Member> {
+        Binding(
+            get: {
+                self.state[keyPath: dynamicMember]
+            },
+            set: { newValue in
+                self.state[keyPath: dynamicMember] = newValue
+            }
+        )
+    }
+}