659 lines
28 KiB
Swift
659 lines
28 KiB
Swift
//
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// TimelineViewController.swift
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// Tusker
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//
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// Created by Shadowfacts on 9/20/22.
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// Copyright © 2022 Shadowfacts. All rights reserved.
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//
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import UIKit
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import Pachyderm
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import Combine
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class TimelineViewController: UIViewController, TimelineLikeCollectionViewController, RefreshableViewController {
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let timeline: Timeline
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weak var mastodonController: MastodonController!
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private(set) var controller: TimelineLikeController<TimelineItem>!
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let confirmLoadMore = PassthroughSubject<Void, Never>()
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// stored separately because i don't want to query the snapshot every time the user scrolls
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private var isShowingTimelineDescription = false
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private(set) var collectionView: UICollectionView!
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private(set) var dataSource: UICollectionViewDiffableDataSource<Section, Item>!
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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(nibName: nil, bundle: nil)
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self.controller = TimelineLikeController(delegate: self)
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self.navigationItem.title = timeline.title
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addKeyCommand(MenuController.refreshCommand(discoverabilityTitle: "Refresh Timeline"))
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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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override func viewDidLoad() {
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super.viewDidLoad()
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var config = UICollectionLayoutListConfiguration(appearance: .plain)
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config.leadingSwipeActionsConfigurationProvider = { [unowned self] in
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(collectionView.cellForItem(at: $0) as? TimelineStatusCollectionViewCell)?.leadingSwipeActions()
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}
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config.trailingSwipeActionsConfigurationProvider = { [unowned self] in
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(collectionView.cellForItem(at: $0) as? TimelineStatusCollectionViewCell)?.trailingSwipeActions()
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}
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config.itemSeparatorHandler = { [unowned self] indexPath, sectionSeparatorConfiguration in
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guard let item = self.dataSource.itemIdentifier(for: indexPath) else {
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return sectionSeparatorConfiguration
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}
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var config = sectionSeparatorConfiguration
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if item.hideSeparators {
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config.topSeparatorVisibility = .hidden
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config.bottomSeparatorVisibility = .hidden
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}
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if case .status(_, _) = item {
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config.topSeparatorInsets = TimelineStatusCollectionViewCell.separatorInsets
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config.bottomSeparatorInsets = TimelineStatusCollectionViewCell.separatorInsets
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}
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return config
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}
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let layout = UICollectionViewCompositionalLayout.list(using: config)
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collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
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collectionView.delegate = self
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collectionView.dragDelegate = self
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collectionView.translatesAutoresizingMaskIntoConstraints = false
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view.addSubview(collectionView)
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NSLayoutConstraint.activate([
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collectionView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
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collectionView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
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collectionView.topAnchor.constraint(equalTo: view.topAnchor),
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collectionView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
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])
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registerTimelineLikeCells()
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collectionView.register(PublicTimelineDescriptionCollectionViewCell.self, forCellWithReuseIdentifier: "publicTimelineDescription")
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dataSource = createDataSource()
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applyInitialSnapshot()
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#if !targetEnvironment(macCatalyst)
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collectionView.refreshControl = UIRefreshControl()
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collectionView.refreshControl!.addTarget(self, action: #selector(refresh), for: .valueChanged)
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#endif
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#if DEBUG
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// navigationItem.rightBarButtonItem = UIBarButtonItem(image: UIImage(systemName: "square.split.1x2.fill"), primaryAction: UIAction(handler: { [unowned self] _ in
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// var snapshot = self.dataSource.snapshot()
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// let statuses = snapshot.itemIdentifiers(inSection: .statuses)
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// if statuses.count > 20 {
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// let toRemove = Array(Array(statuses.dropFirst(10)).dropLast(10))
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// if !toRemove.isEmpty {
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// print("REMOVING MIDDLE \(toRemove.count) STATUSES")
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// snapshot.insertItems([.gap], beforeItem: toRemove.first!)
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// snapshot.deleteItems(toRemove)
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// self.dataSource.apply(snapshot)
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// }
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// }
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// }))
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navigationItem.rightBarButtonItem = UIBarButtonItem(image: UIImage(systemName: "clock.arrow.circlepath"), primaryAction: UIAction(handler: { [unowned self] _ in
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var snapshot = self.dataSource.snapshot()
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let statuses = snapshot.itemIdentifiers(inSection: .statuses)
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if statuses.count > 20 {
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let toRemove = Array(statuses.dropLast(20))
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snapshot.deleteItems(toRemove)
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self.dataSource.apply(snapshot)
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// if case .status(id: let id, state: _) = snapshot.itemIdentifiers(inSection: .statuses).first {
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// self.controller.dataSource.state.newer = .after(id: id, count: nil)
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// }
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}
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}))
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#else
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#error("remove me")
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#endif
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}
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// separate method because InstanceTimelineViewController needs to be able to customize it
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func configureStatusCell(_ cell: TimelineStatusCollectionViewCell, id: String, state: StatusState) {
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cell.delegate = self
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cell.updateUI(statusID: id, state: state)
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}
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private func createDataSource() -> UICollectionViewDiffableDataSource<Section, Item> {
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let statusCell = UICollectionView.CellRegistration<TimelineStatusCollectionViewCell, (String, StatusState)> { [unowned self] cell, indexPath, item in
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self.configureStatusCell(cell, id: item.0, state: item.1)
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}
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let gapCell = UICollectionView.CellRegistration<TimelineGapCollectionViewCell, Void> { [unowned self] cell, indexPath, _ in
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cell.fillGap = { [unowned self] direction in
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Task {
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await self.controller.fillGap(in: direction)
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}
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}
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}
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let timelineDescriptionCell = UICollectionView.CellRegistration<PublicTimelineDescriptionCollectionViewCell, Item> { [unowned self] cell, indexPath, item in
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guard case .public(let local) = timeline else {
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fatalError()
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}
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cell.mastodonController = self.mastodonController
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cell.local = local
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cell.didDismiss = { [unowned self] in
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self.removeTimelineDescriptionCell()
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}
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}
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return UICollectionViewDiffableDataSource(collectionView: collectionView) { [unowned self] collectionView, indexPath, itemIdentifier in
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switch itemIdentifier {
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case .status(id: let id, state: let state):
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return collectionView.dequeueConfiguredReusableCell(using: statusCell, for: indexPath, item: (id, state))
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case .gap:
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return collectionView.dequeueConfiguredReusableCell(using: gapCell, for: indexPath, item: ())
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case .loadingIndicator:
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return loadingIndicatorCell(for: indexPath)
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case .confirmLoadMore:
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return confirmLoadMoreCell(for: indexPath)
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case .publicTimelineDescription:
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self.isShowingTimelineDescription = true
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return collectionView.dequeueConfiguredReusableCell(using: timelineDescriptionCell, for: indexPath, item: itemIdentifier)
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}
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}
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}
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// non-private, because ListTimelineViewController needs to be able to reload it from scratch
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func applyInitialSnapshot() {
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var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
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if case .public(let local) = timeline,
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(local && !Preferences.shared.hasShownLocalTimelineDescription) ||
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(!local && !Preferences.shared.hasShownFederatedTimelineDescription) {
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snapshot.appendSections([.header])
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snapshot.appendItems([.publicTimelineDescription], toSection: .header)
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}
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dataSource.apply(snapshot, animatingDifferences: false)
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}
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override func viewWillAppear(_ animated: Bool) {
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super.viewWillAppear(animated)
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collectionView.indexPathsForSelectedItems?.forEach {
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collectionView.deselectItem(at: $0, animated: true)
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}
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Task {
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if case .notLoadedInitial = controller.state {
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await controller.loadInitial()
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}
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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 isShowingTimelineDescription,
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case .public(let 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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// pruneOffscreenRows()
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}
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private func removeTimelineDescriptionCell() {
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var snapshot = dataSource.snapshot()
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snapshot.deleteSections([.header])
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dataSource.apply(snapshot, animatingDifferences: true)
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isShowingTimelineDescription = false
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}
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// private func pruneOffscreenRows() {
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// guard let lastVisibleIndexPath = collectionView.indexPathsForVisibleItems.last else {
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// return
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// }
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// var snapshot = dataSource.snapshot()
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// guard snapshot.indexOfSection(.statuses) != nil else {
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// return
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// }
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// let items = snapshot.itemIdentifiers(inSection: .statuses)
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// let pageSize = 20
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// let numberOfPagesToPrune = (items.count - lastVisibleIndexPath.row - 1) / pageSize
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// if numberOfPagesToPrune > 0 {
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// let itemsToRemove = Array(items.suffix(numberOfPagesToPrune * pageSize))
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// snapshot.deleteItems(itemsToRemove)
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//
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// dataSource.apply(snapshot, animatingDifferences: false)
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//
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// if case .status(id: let id, state: _) = snapshot.itemIdentifiers(inSection: .statuses).last {
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// older = .before(id: id, count: nil)
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// }
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// }
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// }
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@objc func refresh() {
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Task {
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if case .notLoadedInitial = controller.state {
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await controller.loadInitial()
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} else {
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// I'm not sure whether this should move into TimelineLikeController/TimelineLikeCollectionViewController
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let (_, presentItems) = await (controller.loadNewer(), try? loadInitial())
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if let presentItems,
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case .status(id: let id, state: _) = dataSource.snapshot().itemIdentifiers(inSection: .statuses).first {
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// if there's no overlap between presentItems and the existing items in the data source, prompt the user to scroll to present
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if !presentItems.contains(id) {
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var snapshot = self.dataSource.snapshot()
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let currentItems = snapshot.itemIdentifiers(inSection: .statuses)
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guard let item = currentItems.first,
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case .status(id: id, state: _) = item else {
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return
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}
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// remove any existing gap if there is one
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if let index = currentItems.lastIndex(of: .gap) {
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snapshot.deleteItems(Array(currentItems[index...]))
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}
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snapshot.insertItems([.gap], beforeItem: item)
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snapshot.insertItems(presentItems.map { .status(id: $0, state: .unknown) }, beforeItem: .gap)
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// use a snapshot of the collection view to hide the flicker as the content offset changes and then changes back
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let snapshotView = collectionView.snapshotView(afterScreenUpdates: false)!
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snapshotView.layer.zPosition = 1000
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snapshotView.frame = view.bounds
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view.addSubview(snapshotView)
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let bottomOffset = collectionView.contentSize.height - collectionView.contentOffset.y
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self.dataSource.apply(snapshot, animatingDifferences: false) {
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self.collectionView.contentOffset = CGPoint(x: 0, y: self.collectionView.contentSize.height - bottomOffset)
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snapshotView.removeFromSuperview()
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}
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var config = ToastConfiguration(title: "Jump to present")
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config.edge = .top
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config.systemImageName = "arrow.up"
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config.dismissAutomaticallyAfter = 2
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config.action = { [unowned self] toast in
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toast.dismissToast(animated: true)
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self.collectionView.scrollToTop()
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}
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self.showToast(configuration: config, animated: true)
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}
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}
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}
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#if !targetEnvironment(macCatalyst)
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collectionView.refreshControl?.endRefreshing()
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#endif
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}
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}
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}
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extension TimelineViewController {
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enum Section: TimelineLikeCollectionViewSection {
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case header
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case statuses
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case footer
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static var entries: Self { .statuses }
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}
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enum Item: TimelineLikeCollectionViewItem {
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typealias TimelineItem = String // status ID
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case status(id: String, state: StatusState)
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case gap
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case loadingIndicator
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case confirmLoadMore
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case publicTimelineDescription
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static func fromTimelineItem(_ id: String) -> Self {
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return .status(id: id, state: .unknown)
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}
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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 (.gap, .gap):
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return true
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case (.loadingIndicator, .loadingIndicator):
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return true
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case (.confirmLoadMore, .confirmLoadMore):
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return true
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case (.publicTimelineDescription, .publicTimelineDescription):
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return true
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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 .status(id: let id, state: _):
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hasher.combine(0)
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hasher.combine(id)
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case .gap:
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hasher.combine(1)
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case .loadingIndicator:
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hasher.combine(2)
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case .confirmLoadMore:
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hasher.combine(3)
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case .publicTimelineDescription:
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hasher.combine(4)
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}
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}
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var hideSeparators: Bool {
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switch self {
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case .loadingIndicator, .publicTimelineDescription, .confirmLoadMore:
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return true
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default:
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return false
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}
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}
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var isSelectable: Bool {
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switch self {
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case .publicTimelineDescription, .status(id: _, state: _):
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return true
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default:
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return false
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}
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}
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}
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}
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// MARK: TimelineLikeControllerDelegate
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extension TimelineViewController {
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typealias TimelineItem = String // status ID
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func loadInitial() async throws -> [TimelineItem] {
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try await Task.sleep(nanoseconds: 1 * NSEC_PER_SEC)
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let request = Client.getStatuses(timeline: timeline)
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let (statuses, _) = try await mastodonController.run(request)
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await withCheckedContinuation { continuation in
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mastodonController.persistentContainer.addAll(statuses: statuses) {
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continuation.resume()
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}
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}
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return statuses.map(\.id)
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}
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func loadNewer() async throws -> [TimelineItem] {
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let statusesSection = dataSource.snapshot().indexOfSection(.statuses)!
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guard case .status(id: let id, state: _) = dataSource.itemIdentifier(for: IndexPath(row: 0, section: statusesSection)) else {
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throw Error.noNewer
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}
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let newer = RequestRange.after(id: id, count: nil)
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let request = Client.getStatuses(timeline: timeline, range: newer)
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let (statuses, _) = try await mastodonController.run(request)
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guard !statuses.isEmpty else {
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throw TimelineViewController.Error.allCaughtUp
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}
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await withCheckedContinuation { continuation in
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mastodonController.persistentContainer.addAll(statuses: statuses) {
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continuation.resume()
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}
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}
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return statuses.map(\.id)
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}
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func loadOlder() async throws -> [TimelineItem] {
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let snapshot = dataSource.snapshot()
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let statusesSection = snapshot.indexOfSection(.statuses)!
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guard case .status(id: let id, state: _) = dataSource.itemIdentifier(for: IndexPath(row: snapshot.numberOfItems(inSection: .statuses) - 1, section: statusesSection)) else {
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throw Error.noNewer
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}
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let older = RequestRange.before(id: id, count: nil)
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let request = Client.getStatuses(timeline: timeline, range: older)
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let (statuses, _) = try await mastodonController.run(request)
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guard !statuses.isEmpty else {
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return []
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}
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await withCheckedContinuation { continuation in
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mastodonController.persistentContainer.addAll(statuses: statuses) {
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continuation.resume()
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}
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}
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return statuses.map(\.id)
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}
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func loadGap(in direction: TimelineGapDirection) async throws -> [TimelineItem] {
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guard let gapIndexPath = dataSource.indexPath(for: .gap) else {
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throw Error.noGap
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}
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let statusItemsCount = collectionView.numberOfItems(inSection: gapIndexPath.section)
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let range: RequestRange
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switch direction {
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case .above:
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guard gapIndexPath.row > 0,
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case .status(id: let id, state: _) = dataSource.itemIdentifier(for: IndexPath(row: gapIndexPath.row - 1, section: gapIndexPath.section)) else {
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// not really the right error but w/e
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throw Error.noGap
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}
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range = .before(id: id, count: nil)
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case .below:
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guard gapIndexPath.row < statusItemsCount - 1,
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case .status(id: let id, state: _) = dataSource.itemIdentifier(for: IndexPath(row: gapIndexPath.row + 1, section: gapIndexPath.section)) else {
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throw Error.noGap
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}
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range = .after(id: id, count: nil)
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}
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let request = Client.getStatuses(timeline: timeline, range: range)
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let (statuses, _) = try await mastodonController.run(request)
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guard !statuses.isEmpty else {
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return []
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}
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// NOTE: closing the gap (if necessary) happens in handleFillGap
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await withCheckedContinuation { continuation in
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mastodonController.persistentContainer.addAll(statuses: statuses) {
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continuation.resume()
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}
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}
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return statuses.map(\.id)
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}
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func handleLoadGapError(_ error: Swift.Error, direction: TimelineGapDirection) async {
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// TODO: better title, involving direction?
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let config = ToastConfiguration(from: error, with: "Error Loading", in: self) { [weak self] toast in
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toast.dismissToast(animated: true)
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Task {
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await self?.controller.fillGap(in: direction)
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}
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}
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self.showToast(configuration: config, animated: true)
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}
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func handleFillGap(_ timelineItems: [String], direction: TimelineGapDirection) async {
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var snapshot = dataSource.snapshot()
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let addedItems: Bool
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let statusItems = snapshot.itemIdentifiers(inSection: .statuses)
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let gapIndex = statusItems.firstIndex(of: .gap)!
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switch direction {
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case .above:
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// dropFirst to remove .gap item
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let afterGap = statusItems[gapIndex...].dropFirst().prefix(20)
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precondition(!afterGap.contains(.gap))
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// if there is any overlap, the first overlapping item will be the first item below the gap
|
|
var indexOfFirstTimelineItemExistingBelowGap: Int?
|
|
if case .status(id: let id, state: _) = afterGap.first {
|
|
indexOfFirstTimelineItemExistingBelowGap = timelineItems.firstIndex(of: id)
|
|
}
|
|
|
|
// the end index of the range of timelineItems that don't yet exist in the data source
|
|
let endIndex = indexOfFirstTimelineItemExistingBelowGap ?? timelineItems.endIndex
|
|
let toInsert = timelineItems[..<endIndex].map { Item.status(id: $0, state: .unknown) }
|
|
if toInsert.isEmpty {
|
|
addedItems = false
|
|
} else {
|
|
snapshot.insertItems(toInsert, beforeItem: .gap)
|
|
addedItems = true
|
|
}
|
|
|
|
// if there's any overlap between the items we loaded to insert above the gap
|
|
// and the items that already exist below the gap, we've completely filled the gap
|
|
if indexOfFirstTimelineItemExistingBelowGap != nil {
|
|
snapshot.deleteItems([.gap])
|
|
}
|
|
|
|
case .below:
|
|
let beforeGap = statusItems[..<gapIndex].suffix(20)
|
|
precondition(!beforeGap.contains(.gap))
|
|
|
|
// if there's any overlap, last overlapping item will be the last item below the gap
|
|
var indexOfLastTimelineItemExistingAboveGap: Int?
|
|
if case .status(id: let id, state: _) = beforeGap.last {
|
|
indexOfLastTimelineItemExistingAboveGap = timelineItems.lastIndex(of: id)
|
|
}
|
|
|
|
// the start index of the reange of timeline items that don't yet exist in the data source
|
|
let startIndex: Int
|
|
if let indexOfLastTimelineItemExistingAboveGap {
|
|
// index(after:) because the beginning of the range is inclusive, but we don't want the item at indexOfLastTimelineItemExistingAboveGap
|
|
startIndex = timelineItems.index(after: indexOfLastTimelineItemExistingAboveGap)
|
|
} else {
|
|
startIndex = timelineItems.startIndex
|
|
}
|
|
let toInsert = timelineItems[startIndex...].map { Item.status(id: $0, state: .unknown) }
|
|
if toInsert.isEmpty {
|
|
addedItems = false
|
|
} else {
|
|
snapshot.insertItems(toInsert, afterItem: .gap)
|
|
addedItems = true
|
|
}
|
|
|
|
// if there's any overlap between the items we loaded to insert below the gap
|
|
// and the items that already exist above the gap, we've completely filled the gap
|
|
if indexOfLastTimelineItemExistingAboveGap != nil {
|
|
snapshot.deleteItems([.gap])
|
|
}
|
|
}
|
|
|
|
// if we didn't add any items, that implies the gap was removed, and we want to to make clear what's happening
|
|
if !addedItems {
|
|
var config = ToastConfiguration(title: "There's nothing in between!")
|
|
config.dismissAutomaticallyAfter = 2
|
|
showToast(configuration: config, animated: true)
|
|
}
|
|
|
|
await apply(snapshot, animatingDifferences: true)
|
|
}
|
|
|
|
enum Error: TimelineLikeCollectionViewError {
|
|
case noClient
|
|
case noNewer
|
|
case noOlder
|
|
case allCaughtUp
|
|
case noGap
|
|
}
|
|
}
|
|
|
|
extension TimelineViewController: UICollectionViewDelegate {
|
|
func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
|
|
guard case .statuses = dataSource.sectionIdentifier(for: indexPath.section) else {
|
|
return
|
|
}
|
|
|
|
let itemsInSection = collectionView.numberOfItems(inSection: indexPath.section)
|
|
if indexPath.row == itemsInSection - 1 {
|
|
Task {
|
|
await controller.loadOlder()
|
|
}
|
|
}
|
|
}
|
|
|
|
func collectionView(_ collectionView: UICollectionView, shouldSelectItemAt indexPath: IndexPath) -> Bool {
|
|
return dataSource.itemIdentifier(for: indexPath)?.isSelectable ?? false
|
|
}
|
|
|
|
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
|
|
guard let item = dataSource.itemIdentifier(for: indexPath) else {
|
|
return
|
|
}
|
|
switch item {
|
|
case .publicTimelineDescription:
|
|
removeTimelineDescriptionCell()
|
|
case .status(id: let id, state: let state):
|
|
let status = mastodonController.persistentContainer.status(for: id)!
|
|
// if the status in the timeline is a reblog, show the status that it is a reblog of
|
|
selected(status: status.reblog?.id ?? id, state: state.copy())
|
|
case .gap, .loadingIndicator, .confirmLoadMore:
|
|
fatalError("unreachable")
|
|
}
|
|
}
|
|
|
|
func collectionView(_ collectionView: UICollectionView, contextMenuConfigurationForItemAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration? {
|
|
return (collectionView.cellForItem(at: indexPath) as? TimelineStatusCollectionViewCell)?.contextMenuConfiguration()
|
|
}
|
|
|
|
func collectionView(_ collectionView: UICollectionView, willPerformPreviewActionForMenuWith configuration: UIContextMenuConfiguration, animator: UIContextMenuInteractionCommitAnimating) {
|
|
MenuPreviewHelper.willPerformPreviewAction(animator: animator, presenter: self)
|
|
}
|
|
|
|
func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
|
|
if isShowingTimelineDescription {
|
|
removeTimelineDescriptionCell()
|
|
}
|
|
}
|
|
}
|
|
|
|
extension TimelineViewController: UICollectionViewDragDelegate {
|
|
func collectionView(_ collectionView: UICollectionView, itemsForBeginning session: UIDragSession, at indexPath: IndexPath) -> [UIDragItem] {
|
|
(collectionView.cellForItem(at: indexPath) as? TimelineStatusCollectionViewCell)?.dragItemsForBeginning(session: session) ?? []
|
|
}
|
|
}
|
|
|
|
extension TimelineViewController: TuskerNavigationDelegate {
|
|
var apiController: MastodonController! { mastodonController }
|
|
}
|
|
|
|
extension TimelineViewController: MenuActionProvider {
|
|
}
|
|
|
|
extension TimelineViewController: StatusCollectionViewCellDelegate {
|
|
func statusCellNeedsReconfigure(_ cell: StatusCollectionViewCell, animated: Bool, completion: (() -> Void)?) {
|
|
if let indexPath = collectionView.indexPath(for: cell) {
|
|
var snapshot = dataSource.snapshot()
|
|
snapshot.reconfigureItems([dataSource.itemIdentifier(for: indexPath)!])
|
|
dataSource.apply(snapshot, animatingDifferences: animated, completion: completion)
|
|
}
|
|
}
|
|
}
|
|
|
|
extension TimelineViewController: TabBarScrollableViewController {
|
|
func tabBarScrollToTop() {
|
|
collectionView.scrollToTop()
|
|
}
|
|
}
|
|
|
|
extension TimelineViewController: StatusBarTappableViewController {
|
|
func handleStatusBarTapped(xPosition: CGFloat) -> StatusBarTapActionResult {
|
|
collectionView.scrollToTop()
|
|
return .stop
|
|
}
|
|
}
|