73 lines
2.9 KiB
Swift
73 lines
2.9 KiB
Swift
//
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// PublicTimelineViewModel+Diffable.swift
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// Mastodon
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//
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// Created by sxiaojian on 2021/1/27.
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//
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import CoreData
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import CoreDataStack
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import os.log
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import UIKit
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extension PublicTimelineViewModel {
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func setupDiffableDataSource(
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for tableView: UITableView,
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dependency: NeedsDependency,
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statusTableViewCellDelegate: StatusTableViewCellDelegate,
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timelineMiddleLoaderTableViewCellDelegate: TimelineMiddleLoaderTableViewCellDelegate
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) {
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let timestampUpdatePublisher = Timer.publish(every: 1.0, on: .main, in: .common)
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.autoconnect()
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.share()
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.eraseToAnyPublisher()
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diffableDataSource = StatusSection.tableViewDiffableDataSource(
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for: tableView,
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timelineContext: .public,
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dependency: dependency,
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managedObjectContext: fetchedResultsController.managedObjectContext,
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timestampUpdatePublisher: timestampUpdatePublisher,
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statusTableViewCellDelegate: statusTableViewCellDelegate,
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timelineMiddleLoaderTableViewCellDelegate: timelineMiddleLoaderTableViewCellDelegate,
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threadReplyLoaderTableViewCellDelegate: nil
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)
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items.value = []
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stateMachine.enter(PublicTimelineViewModel.State.Loading.self)
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}
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}
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// MARK: - NSFetchedResultsControllerDelegate
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extension PublicTimelineViewModel: NSFetchedResultsControllerDelegate {
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func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChangeContentWith snapshot: NSDiffableDataSourceSnapshotReference) {
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os_log("%{public}s[%{public}ld], %{public}s", (#file as NSString).lastPathComponent, #line, #function)
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let indexes = statusIDs.value
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let statuses = fetchedResultsController.fetchedObjects ?? []
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guard statuses.count == indexes.count else { return }
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let indexStatusTuples: [(Int, Status)] = statuses
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.compactMap { status -> (Int, Status)? in
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guard status.deletedAt == nil else { return nil }
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return indexes.firstIndex(of: status.id).map { index in (index, status) }
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}
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.sorted { $0.0 < $1.0 }
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var oldSnapshotAttributeDict: [NSManagedObjectID: Item.StatusAttribute] = [:]
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for item in self.items.value {
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guard case let .status(objectID, attribute) = item else { continue }
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oldSnapshotAttributeDict[objectID] = attribute
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}
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var items = [Item]()
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for (_, status) in indexStatusTuples {
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let attribute = oldSnapshotAttributeDict[status.objectID] ?? Item.StatusAttribute()
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items.append(Item.status(objectID: status.objectID, attribute: attribute))
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if statusIDsWhichHasGap.contains(status.id) {
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items.append(Item.publicMiddleLoader(statusID: status.id))
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}
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}
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self.items.value = items
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}
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}
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