(WIP) SwiftUI working demo for LiveList<D>

Sources/Internals.FetchedDiffableDataSourceSnapshotDelegate.swift

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+//
+//  Internals.FetchedDiffableDataSourceSnapshotDelegate.swift
+//  CoreStore
+//
+//  Copyright © 2018 John Rommel Estropia
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//  SOFTWARE.
+//
+
+#if canImport(UIKit) || canImport(AppKit)
+
+import Foundation
+import CoreData
+
+#if canImport(UIKit)
+
+import UIKit
+
+#elseif canImport(AppKit)
+
+import AppKit
+
+#endif
+
+
+// MARK: - FetchedDiffableDataSourceSnapshot
+
+@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *)
+internal protocol FetchedDiffableDataSourceSnapshotHandler: AnyObject {
+
+    func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChangContentWith snapshot: NSDiffableDataSourceSnapshotReference)
+}
+
+
+// MARK: - Internal
+
+extension Internals {
+
+    // MARK: - FetchedDiffableDataSourceSnapshotDelegate
+
+    @available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *)
+    internal final class FetchedDiffableDataSourceSnapshotDelegate: NSObject, NSFetchedResultsControllerDelegate {
+
+        // MARK: Internal
+
+        @nonobjc
+        internal weak var handler: FetchedDiffableDataSourceSnapshotHandler?
+
+        @nonobjc
+        internal weak var fetchedResultsController: Internals.CoreStoreFetchedResultsController? {
+
+            didSet {
+
+                oldValue?.delegate = nil
+                self.fetchedResultsController?.delegate = self
+            }
+        }
+
+        deinit {
+
+            self.fetchedResultsController?.delegate = nil
+        }
+
+
+        // MARK: NSFetchedResultsControllerDelegate
+
+        @objc
+        dynamic func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChangeContentWith snapshot: NSDiffableDataSourceSnapshotReference) {
+
+            self.handler?.controller(
+                controller,
+                didChangContentWith: snapshot
+            )
+        }
+    }
+}
+
+#endif