feat: update gate state when value changed

Effector/Gate.swift

@@ -1,6 +1,6 @@
 import SwiftUI
 
-public struct Gate<T> {
+public struct Gate<Value> {
     // MARK: Lifecycle
 
     public init() {
@@ -15,13 +15,15 @@ public struct Gate<T> {
 
     // MARK: Public
 
-    public let state = Store<T?>(nil)
+    public let state = Store<Value?>(nil)
     public let status = Store(false)
-    public let open = Event<T>()
+    public let open = Event<Value>()
     public let close = Event<Void>()
 
-    public func view(_ value: T) -> some View {
-        Rectangle()
+    public func callAsFunction(_ value: Value) -> some View {
+        state.setState(value)
+
+        return Rectangle()
             .hidden()
             .onAppear {
                 open(value)
@@ -32,8 +34,8 @@ public struct Gate<T> {
     }
 }
 
-public extension Gate where T == Void {
-    func view() -> some View {
-        view(())
+public extension Gate where Value == Void {
+    func callAsFunction() -> some View {
+        callAsFunction(())
     }
 }

README.md

@@ -10,6 +10,7 @@ enum CounterFeature {
     static let counter = Store(0)
     static let inc = Event<Void>()
     static let dec = Event<Void>()
+    static let CounterGate = Gate<Int>()
 
     static let logFx = Effect<Int, Void, Error> { n in print("n: \(n)") }
 
@@ -28,6 +29,11 @@ enum CounterFeature {
             trigger: counter.updates,
             target: logFx
         )
+
+        CounterGate.open.watch { print("Gate open: \($0)") }
+        CounterGate.close.watch { print("Gate close: \($0)") }
+        CounterGate.status.watch { print("Gate status: \($0)") }
+        CounterGate.state.watch { print("Gate state: \(String(describing: $0))") }
     }
 }
 
@@ -51,6 +57,7 @@ struct ContentView: View {
             Button("inc", action: CounterFeature.inc.run)
             Button("inc 10 async", action: { Task { try await CounterFeature.incAsync() }})
             Button("set 100") { counter = 100 }
+            CounterFeature.CounterGate(counter)
         }
     }
 }