feat: add DidEndDeceleratingEvent

Sources/KarrotListKit/Adapter/CollectionViewAdapter.swift

@@ -486,6 +486,18 @@ extension CollectionViewAdapter {
       )
     )
   }
+
+  public func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
+    guard let collectionView else {
+      return
+    }
+
+    list?.event(for: DidEndDeceleratingEvent.self)?.handler(
+      .init(
+        collectionView: collectionView
+      )
+    )
+  }
 }
 
 // MARK: - UICollectionViewDataSourcePrefetching

Sources/KarrotListKit/Event/List/DidEndDeceleratingEvent.swift

@@ -0,0 +1,17 @@
+//
+//  Copyright (c) 2024 Danggeun Market Inc.
+//
+
+import UIKit
+
+/// This structure encapsulates the did end decelerating event information and contains a closure object for handling the did end decelerating event.
+public struct DidEndDeceleratingEvent: ListingViewEvent {
+  public struct EventContext {
+
+    /// The collectionView object that’s decelerating the scrolling of the content view.
+    public let collectionView: UICollectionView
+  }
+
+  /// A closure that's called when the collection view ended decelerating the scrolling movement.
+  let handler: (EventContext) -> Void
+}

Sources/KarrotListKit/List.swift

@@ -94,4 +94,12 @@ extension List {
   public func willBeginDecelerating(_ handler: @escaping (WillBeginDeceleratingEvent.EventContext) -> Void) -> Self {
     registerEvent(WillBeginDeceleratingEvent(handler: handler))
   }
+
+  /// Register a callback handler that will be called when the scroll view ended decelerating the scrolling movement.
+  ///
+  /// - Parameters:
+  ///  - handler: The callback handler for did end decelerating event
+  public func didEndDecelerating(_ handler: @escaping (DidEndDeceleratingEvent.EventContext) -> Void) -> Self {
+    registerEvent(DidEndDeceleratingEvent(handler: handler))
+  }
 }

Tests/KarrotListKitTests/CollectionViewAdapterTests.swift

@@ -773,6 +773,29 @@ extension CollectionViewAdapterTests {
     // then
     XCTAssertIdentical(eventContext.collectionView, collectionView)
   }
+
+  func test_given_didEndDeceleratingHandler_when_didEndDecelerating_then_handleEvent() {
+    // given
+    var eventContext: DidEndDeceleratingEvent.EventContext!
+    let collectionView = UICollectionView(layoutAdapter: CollectionViewLayoutAdapter())
+    let sut = sut(collectionView: collectionView)
+    sut.list = List(
+      sections: []
+    ).didEndDecelerating { context in
+      eventContext = context
+    }
+
+    // when
+    collectionView
+      .delegate?
+      .scrollViewDidEndDecelerating?(
+        collectionView
+      )
+
+    // then
+    XCTAssertIdentical(eventContext.collectionView, collectionView)
+  }
+
   func test_given_refreshControlEnabled_and_handler_when_pullToRefresh_then_handleEvent() {
     // given
     var eventContext: PullToRefreshEvent.EventContext!