113 lines
4.8 KiB
Swift
113 lines
4.8 KiB
Swift
//
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// NotificationTimelineViewModel+Diffable.swift
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// Mastodon
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//
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// Created by MainasuK on 2022-1-21.
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//
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import UIKit
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import CoreData
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import CoreDataStack
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extension NotificationTimelineViewModel {
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func setupDiffableDataSource(
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tableView: UITableView,
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notificationTableViewCellDelegate: NotificationTableViewCellDelegate
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) {
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diffableDataSource = NotificationSection.diffableDataSource(
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tableView: tableView,
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context: context,
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configuration: NotificationSection.Configuration(
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authContext: authContext,
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notificationTableViewCellDelegate: notificationTableViewCellDelegate,
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filterContext: .notifications,
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activeFilters: context.statusFilterService.$activeFilters
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)
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)
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var snapshot = NSDiffableDataSourceSnapshot<NotificationSection, NotificationItem>()
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snapshot.appendSections([.main])
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diffableDataSource?.apply(snapshot)
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$notifications
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.receive(on: DispatchQueue.main)
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.sink { [weak self] records in
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guard let self = self else { return }
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guard let diffableDataSource = self.diffableDataSource else { return }
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Task {
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let oldSnapshot = diffableDataSource.snapshot()
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var newSnapshot: NSDiffableDataSourceSnapshot<NotificationSection, NotificationItem> = {
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let newItems = records.map { record in
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NotificationItem.feed(record: record)
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}
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var snapshot = NSDiffableDataSourceSnapshot<NotificationSection, NotificationItem>()
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snapshot.appendSections([.main])
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snapshot.appendItems(newItems, toSection: .main)
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return snapshot
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}()
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// let parentManagedObjectContext = self.context.managedObjectContext
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// let managedObjectContext = NSManagedObjectContext(concurrencyType: .privateQueueConcurrencyType)
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// managedObjectContext.parent = parentManagedObjectContext
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// try? await managedObjectContext.perform {
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// let anchors: [Feed] = {
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// let request = Feed.sortedFetchRequest
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// request.predicate = NSCompoundPredicate(andPredicateWithSubpredicates: [
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// Feed.hasMorePredicate(),
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// self.feedFetchedResultsController.predicate,
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// ])
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// do {
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// return try managedObjectContext.fetch(request)
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// } catch {
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// assertionFailure(error.localizedDescription)
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// return []
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// }
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// }()
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//
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// let itemIdentifiers = newSnapshot.itemIdentifiers
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// for (index, item) in itemIdentifiers.enumerated() {
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// guard case let .feed(record) = item else { continue }
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// guard anchors.contains(where: { feed in feed.objectID == record.objectID }) else { continue }
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// let isLast = index + 1 == itemIdentifiers.count
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// if isLast {
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// newSnapshot.insertItems([.bottomLoader], afterItem: item)
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// } else {
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// newSnapshot.insertItems([.feedLoader(record: record)], afterItem: item)
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// }
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// }
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// }
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//
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// let hasChanges = newSnapshot.itemIdentifiers != oldSnapshot.itemIdentifiers
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// if !hasChanges {
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// self.didLoadLatest.send()
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// return
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// }
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await self.updateSnapshotUsingReloadData(snapshot: newSnapshot)
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self.didLoadLatest.send()
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} // end Task
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}
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.store(in: &disposeBag)
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} // end func setupDiffableDataSource
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}
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extension NotificationTimelineViewModel {
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@MainActor func updateDataSource(
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snapshot: NSDiffableDataSourceSnapshot<NotificationSection, NotificationItem>,
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animatingDifferences: Bool
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) async {
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await diffableDataSource?.apply(snapshot, animatingDifferences: animatingDifferences)
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}
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@MainActor func updateSnapshotUsingReloadData(
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snapshot: NSDiffableDataSourceSnapshot<NotificationSection, NotificationItem>
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) async {
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await self.diffableDataSource?.applySnapshotUsingReloadData(snapshot)
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}
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}
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