339 lines
13 KiB
Swift
339 lines
13 KiB
Swift
//
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// TimelineTableViewController.swift
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// Tusker
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//
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// Created by Shadowfacts on 8/15/18.
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// Copyright © 2018 Shadowfacts. All rights reserved.
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//
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import UIKit
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import Pachyderm
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typealias TimelineEntry = (id: String, state: StatusState)
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class TimelineTableViewController: DiffableTimelineLikeTableViewController<TimelineTableViewController.Section, TimelineTableViewController.Item> {
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let timeline: Timeline
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weak var mastodonController: MastodonController!
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private var newer: RequestRange?
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private var older: RequestRange?
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private var didConfirmLoadMore = false
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private var isShowingTimelineDescription = false
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init(for timeline: Timeline, mastodonController: MastodonController) {
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self.timeline = timeline
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self.mastodonController = mastodonController
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super.init()
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dragEnabled = true
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title = timeline.title
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tabBarItem.image = timeline.tabBarImage
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if let id = mastodonController.accountInfo?.id {
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userActivity = UserActivityManager.showTimelineActivity(timeline: timeline, accountID: id)
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}
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}
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required init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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deinit {
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guard let persistentContainer = mastodonController?.persistentContainer,
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let dataSource = dataSource else { return }
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// decrement reference counts of any statuses we still have
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// if the app is currently being quit, this will not affect the persisted data because
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// the persistent container would already have been saved in SceneDelegate.sceneDidEnterBackground(_:)
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// todo: remove the whole reference count system
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for case let .status(id: id, state: _) in dataSource.snapshot().itemIdentifiers {
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persistentContainer.status(for: id)?.decrementReferenceCount()
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}
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}
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override func viewDidLoad() {
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super.viewDidLoad()
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tableView.register(UINib(nibName: "TimelineStatusTableViewCell", bundle: .main), forCellReuseIdentifier: "statusCell")
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tableView.register(UINib(nibName: "ConfirmLoadMoreTableViewCell", bundle: .main), forCellReuseIdentifier: "confirmLoadMoreCell")
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tableView.register(UINib(nibName: "PublicTimelineDescriptionTableViewCell", bundle: .main), forCellReuseIdentifier: "publicTimelineDescriptionCell")
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if case let .public(local: local) = timeline,
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(local && !Preferences.shared.hasShownLocalTimelineDescription) || (!local && !Preferences.shared.hasShownFederatedTimelineDescription) {
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isShowingTimelineDescription = true
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var snapshot = self.dataSource.snapshot()
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snapshot.appendSections([.header])
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snapshot.appendItems([.publicTimelineDescription(local: local)], toSection: .header)
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self.dataSource.apply(snapshot, animatingDifferences: false)
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}
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}
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override func viewDidAppear(_ animated: Bool) {
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super.viewDidAppear(animated)
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if case let .public(local: local) = timeline {
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if local {
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Preferences.shared.hasShownLocalTimelineDescription = true
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} else {
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Preferences.shared.hasShownFederatedTimelineDescription = true
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}
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}
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}
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override func viewDidDisappear(_ animated: Bool) {
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super.viewDidDisappear(animated)
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if isShowingTimelineDescription {
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isShowingTimelineDescription = false
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var snapshot = self.dataSource.snapshot()
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snapshot.deleteSections([.header])
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self.dataSource.apply(snapshot, animatingDifferences: false)
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}
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}
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// MARK: - DiffableTimelineLikeTableViewController
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override class func refreshCommandTitle() -> String {
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return NSLocalizedString("Refresh Statuses", comment: "refresh status command discoverability title")
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}
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override func timelineContentSections() -> [Section] {
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return [.statuses]
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}
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override func cellProvider(_ tableView: UITableView, _ indexPath: IndexPath, _ item: Item) -> UITableViewCell? {
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switch item {
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case let .status(id: id, state: state):
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let cell = tableView.dequeueReusableCell(withIdentifier: "statusCell", for: indexPath) as! TimelineStatusTableViewCell
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cell.delegate = self
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cell.updateUI(statusID: id, state: state)
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return cell
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case .confirmLoadMore:
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let cell = tableView.dequeueReusableCell(withIdentifier: "confirmLoadMoreCell", for: indexPath) as! ConfirmLoadMoreTableViewCell
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cell.confirmLoadMore = {
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self.didConfirmLoadMore = true
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self.loadOlder()
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self.didConfirmLoadMore = false
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}
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return cell
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case .publicTimelineDescription(local: let local):
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let cell = tableView.dequeueReusableCell(withIdentifier: "publicTimelineDescriptionCell", for: indexPath) as! PublicTimelineDescriptionTableViewCell
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cell.mastodonController = mastodonController
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cell.local = local
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cell.didDismiss = { [unowned self] in
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var snapshot = self.dataSource.snapshot()
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snapshot.deleteSections([.header])
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self.dataSource.apply(snapshot)
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}
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return cell
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}
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}
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override func loadInitialItems(completion: @escaping (LoadResult) -> Void) {
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guard let mastodonController = mastodonController else {
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completion(.failure(.noClient))
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return
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}
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let request = Client.getStatuses(timeline: timeline)
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mastodonController.run(request) { response in
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switch response {
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case let .failure(error):
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completion(.failure(.client(error)))
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case let .success(statuses, pagination):
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self.newer = pagination?.newer
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self.older = pagination?.older
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self.mastodonController.persistentContainer.addAll(statuses: statuses) {
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DispatchQueue.main.async {
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var snapshot = self.dataSource.snapshot()
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snapshot.deleteSections([.statuses, .footer])
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snapshot.appendSections([.statuses, .footer])
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snapshot.appendItems(statuses.map { .status(id: $0.id, state: .unknown) }, toSection: .statuses)
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completion(.success(snapshot))
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}
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}
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}
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}
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}
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override func loadOlderItems(currentSnapshot: @escaping () -> Snapshot, completion: @escaping (LoadResult) -> Void) {
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guard let older = older else {
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completion(.failure(.noOlder))
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return
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}
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if #available(iOS 15.0, *),
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Preferences.shared.disableInfiniteScrolling && !didConfirmLoadMore {
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var snapshot = currentSnapshot()
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guard !snapshot.itemIdentifiers(inSection: .footer).contains(.confirmLoadMore) else {
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// todo: need something more accurate than "success"/"failure"
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completion(.success(snapshot))
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return
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}
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snapshot.appendItems([.confirmLoadMore], toSection: .footer)
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self.dataSource.apply(snapshot)
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completion(.success(snapshot))
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return
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}
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let request = Client.getStatuses(timeline: timeline, range: older)
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mastodonController.run(request) { response in
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switch response {
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case let .failure(error):
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completion(.failure(.client(error)))
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case let .success(statuses, pagination):
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self.older = pagination?.older
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self.mastodonController.persistentContainer.addAll(statuses: statuses) {
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var snapshot = currentSnapshot()
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snapshot.appendItems(statuses.map { .status(id: $0.id, state: .unknown) }, toSection: .statuses)
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snapshot.deleteItems([.confirmLoadMore])
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completion(.success(snapshot))
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}
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}
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}
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}
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override func loadNewerItems(currentSnapshot: @escaping () -> Snapshot, completion: @escaping (LoadResult) -> Void) {
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guard let newer = newer else {
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completion(.failure(.noNewer))
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return
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}
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let request = Client.getStatuses(timeline: timeline, range: newer)
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mastodonController.run(request) { response in
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switch response {
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case let .failure(error):
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completion(.failure(.client(error)))
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case let .success(statuses, pagination):
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guard !statuses.isEmpty else {
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completion(.failure(.allCaughtUp))
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return
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}
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// if there are no new statuses, pagination is nil
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// if we were to then overwrite self.newer, future refresh would fail
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if let newer = pagination?.newer {
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self.newer = newer
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}
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self.mastodonController.persistentContainer.addAll(statuses: statuses) {
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var snapshot = currentSnapshot()
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let newIdentifiers = statuses.map { Item.status(id: $0.id, state: .unknown) }
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if let first = snapshot.itemIdentifiers(inSection: .statuses).first {
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snapshot.insertItems(newIdentifiers, beforeItem: first)
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} else {
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snapshot.appendItems(newIdentifiers, toSection: .statuses)
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}
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completion(.success(snapshot))
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}
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}
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}
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}
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override func willRemoveItems(_ items: [Item]) {
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for case let .status(id: id, state: _) in items {
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mastodonController.persistentContainer.status(for: id)?.decrementReferenceCount()
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}
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}
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override func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
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super.scrollViewWillBeginDragging(scrollView)
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if isShowingTimelineDescription {
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var snapshot = self.dataSource.snapshot()
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snapshot.deleteSections([.header])
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self.dataSource.apply(snapshot, animatingDifferences: true)
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}
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}
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}
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extension TimelineTableViewController {
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enum Section: Hashable, CaseIterable {
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case header
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case statuses
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case footer
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}
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enum Item: Hashable {
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case status(id: String, state: StatusState)
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case confirmLoadMore
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case publicTimelineDescription(local: Bool)
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static func ==(lhs: Item, rhs: Item) -> Bool {
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switch (lhs, rhs) {
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case let (.status(id: a, state: _), .status(id: b, state: _)):
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return a == b
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case (.confirmLoadMore, .confirmLoadMore):
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return true
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case let (.publicTimelineDescription(local: a), .publicTimelineDescription(local: b)):
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return a == b
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default:
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return false
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}
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}
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func hash(into hasher: inout Hasher) {
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switch self {
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case let .status(id: id, state: _):
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hasher.combine(0)
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hasher.combine(id)
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case .confirmLoadMore:
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hasher.combine(1)
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case let .publicTimelineDescription(local: local):
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hasher.combine(2)
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hasher.combine(local)
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}
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}
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}
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}
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extension TimelineTableViewController: TuskerNavigationDelegate {
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var apiController: MastodonController { mastodonController }
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}
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extension TimelineTableViewController: StatusTableViewCellDelegate {
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func statusCellCollapsedStateChanged(_ cell: BaseStatusTableViewCell) {
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cellHeightChanged()
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}
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}
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extension TimelineTableViewController: UITableViewDataSourcePrefetching, StatusTablePrefetching {
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func tableView(_ tableView: UITableView, prefetchRowsAt indexPaths: [IndexPath]) {
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let ids: [String] = indexPaths.compactMap {
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if case let .status(id: id, state: _) = dataSource.itemIdentifier(for: $0) {
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return id
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} else {
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return nil
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}
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}
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prefetchStatuses(with: ids)
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}
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func tableView(_ tableView: UITableView, cancelPrefetchingForRowsAt indexPaths: [IndexPath]) {
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let ids: [String] = indexPaths.compactMap {
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if case let .status(id: id, state: _) = dataSource.itemIdentifier(for: $0) {
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return id
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} else {
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return nil
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}
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}
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cancelPrefetchingStatuses(with: ids)
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}
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}
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