From 2ae97ff8b3c0be75bdf16af83b095d3423678bb3 Mon Sep 17 00:00:00 2001
From: Dominic Go <dominic@dominicgo.dev>
Date: Fri, 27 Sep 2024 20:31:32 +0800
Subject: [PATCH] =?UTF-8?q?=E2=AD=90=EF=B8=8F=20Impl:=20`ModalSheetPresent?=
 =?UTF-8?q?ationStateMachine.eventDelegates`?=
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---
 ...eetPresentationStateEventsNotifiable.swift | 47 +++++++++++++++++++
 .../ModalSheetPresentationStateMachine.swift  | 19 ++++++++
 2 files changed, 66 insertions(+)
 create mode 100644 ios/Temp/ModalSheetPresentationStateEventsNotifiable.swift

diff --git a/ios/Temp/ModalSheetPresentationStateEventsNotifiable.swift b/ios/Temp/ModalSheetPresentationStateEventsNotifiable.swift
new file mode 100644
index 00000000..659b209b
--- /dev/null
+++ b/ios/Temp/ModalSheetPresentationStateEventsNotifiable.swift
@@ -0,0 +1,47 @@
+//
+//  ModalSheetPresentationStateEventsNotifiable.swift
+//  react-native-ios-modal
+//
+//  Created by Dominic Go on 9/27/24.
+//
+
+import Foundation
+
+public protocol ModalSheetPresentationStateEventsNotifiable: AnyObject {
+  
+  func onModalSheetStateWillChange(
+    sender: ModalSheetPresentationStateMachine,
+    prevState: ModalSheetState?,
+    currentState: ModalSheetState,
+    nextState: ModalSheetState
+  );
+  
+  func onModalSheetStateDidChange(
+    sender: ModalSheetPresentationStateMachine,
+    prevState: ModalSheetState?,
+    currentState: ModalSheetState
+  );
+};
+
+// MARK: - ModalSheetPresentationStateEventsNotifiable+Default
+// -----------------------------------------------------------
+
+public extension ModalSheetPresentationStateEventsNotifiable {
+  
+  func onModalSheetStateWillChange(
+    sender: ModalSheetPresentationStateMachine,
+    prevState: ModalSheetState?,
+    currentState: ModalSheetState,
+    nextState: ModalSheetState
+  ) {
+    // no-op
+  };
+  
+  func onModalSheetStateDidChange(
+    sender: ModalSheetPresentationStateMachine,
+    prevState: ModalSheetState?,
+    currentState: ModalSheetState
+  ) {
+    // no-op
+  };
+};
diff --git a/ios/Temp/ModalSheetPresentationStateMachine.swift b/ios/Temp/ModalSheetPresentationStateMachine.swift
index 63c07ea7..52f8b545 100644
--- a/ios/Temp/ModalSheetPresentationStateMachine.swift
+++ b/ios/Temp/ModalSheetPresentationStateMachine.swift
@@ -17,6 +17,8 @@ public class ModalSheetPresentationStateMachine {
   public var didPresent = false;
   public var didDismissAfterPresented = false;
   
+  public var eventDelegates:
+    MulticastDelegate<ModalSheetPresentationStateEventsNotifiable> = .init();
     
   // MARK: - Methods
   // ---------------
@@ -39,6 +41,15 @@ public class ModalSheetPresentationStateMachine {
       );
     };
     #endif
+    
+    self.eventDelegates.invoke {
+      $0.onModalSheetStateWillChange(
+        sender: self,
+        prevState: prevState,
+        currentState: currentState,
+        nextState: nextState
+      );
+    };
   
     self.prevState = self.currentState;
     self.currentState = nextState;
@@ -71,6 +82,14 @@ public class ModalSheetPresentationStateMachine {
       );
     };
     #endif
+    
+    self.eventDelegates.invoke {
+      $0.onModalSheetStateDidChange(
+        sender: self,
+        prevState: self.prevState,
+        currentState: self.currentState
+      );
+    };
   };
   
   public func setState(nextState: ModalSheetState) {