1390 lines
63 KiB
Swift
1390 lines
63 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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import Sentry
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protocol TimelineViewControllerDelegate: AnyObject {
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func timelineViewController(_ timelineViewController: TimelineViewController, willShowJumpToPresentToastWith animator: UIViewPropertyAnimator?)
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func timelineViewController(_ timelineViewController: TimelineViewController, willDismissJumpToPresentToastWith animator: UIViewPropertyAnimator?)
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func timelineViewController(_ timelineViewController: TimelineViewController, willShowSyncToastWith animator: UIViewPropertyAnimator?)
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func timelineViewController(_ timelineViewController: TimelineViewController, willDismissSyncToastWith animator: UIViewPropertyAnimator?)
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}
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extension TimelineViewControllerDelegate {
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func timelineViewController(_ timelineViewController: TimelineViewController, willShowJumpToPresentToastWith animator: UIViewPropertyAnimator?) {}
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func timelineViewController(_ timelineViewController: TimelineViewController, willDismissJumpToPresentToastWith animator: UIViewPropertyAnimator?) {}
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func timelineViewController(_ timelineViewController: TimelineViewController, willShowSyncToastWith animator: UIViewPropertyAnimator?) {}
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func timelineViewController(_ timelineViewController: TimelineViewController, willDismissSyncToastWith animator: UIViewPropertyAnimator?) {}
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}
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class TimelineViewController: UIViewController, TimelineLikeCollectionViewController, CollectionViewController, RefreshableViewController, StateRestorableViewController {
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weak var delegate: TimelineViewControllerDelegate?
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let timeline: Timeline
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weak var mastodonController: MastodonController!
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let filterer: Filterer
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var persistsState = false
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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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private var cancellables = Set<AnyCancellable>()
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private var userActivityNeedsUpdate = PassthroughSubject<Void, Never>()
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private var contentOffsetObservation: NSKeyValueObservation?
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// the last time this VC disappeared or the scene was backgrounded while it was active, used to decide if we want to check for present when reappearing
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private var disappearedAt: Date?
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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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let filterContext: FilterV1.Context
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switch timeline {
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case .home, .list(id: _):
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filterContext = .home
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default:
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filterContext = .public
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}
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self.filterer = Filterer(mastodonController: mastodonController, context: filterContext)
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self.filterer.htmlConverter.font = TimelineStatusCollectionViewCell.contentFont
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self.filterer.htmlConverter.monospaceFont = TimelineStatusCollectionViewCell.monospaceFont
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self.filterer.htmlConverter.paragraphStyle = TimelineStatusCollectionViewCell.contentParagraphStyle
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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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if let accountID = mastodonController.accountInfo?.id {
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self.userActivity = UserActivityManager.showTimelineActivity(timeline: timeline, accountID: accountID)
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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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override func viewDidLoad() {
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super.viewDidLoad()
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var config = UICollectionLayoutListConfiguration(appearance: .plain)
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config.backgroundColor = .appBackground
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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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} else if case .status(id: _, collapseState: _, filterState: let filterState) = item,
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filterer.isKnownHide(state: filterState) {
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config.topSeparatorVisibility = .hidden
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config.bottomSeparatorVisibility = .hidden
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} else {
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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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// just setting layout.configuration.contentInsetsReference doesn't work with UICollectionViewCompositionalLayout.list
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let layout = UICollectionViewCompositionalLayout { sectionIndex, environment in
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let section = NSCollectionLayoutSection.list(using: config, layoutEnvironment: environment)
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if UIDevice.current.userInterfaceIdiom == .pad || UIDevice.current.userInterfaceIdiom == .mac {
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section.contentInsetsReference = .readableContent
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}
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return section
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}
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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.allowsFocus = true
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collectionView.backgroundColor = .appBackground
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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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contentOffsetObservation = collectionView.observe(\.contentOffset) { [weak self] _, _ in
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if let indexPath = self?.dataSource.indexPath(for: .gap),
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let cell = self?.collectionView.cellForItem(at: indexPath) as? TimelineGapCollectionViewCell {
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cell.update()
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}
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}
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filterer.filtersChanged = { [unowned self] actionsChanged in
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self.reapplyFilters(actionsChanged: actionsChanged)
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}
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NotificationCenter.default.addObserver(self, selector: #selector(sceneWillEnterForeground), name: UIScene.willEnterForegroundNotification, object: nil)
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NotificationCenter.default.addObserver(self, selector: #selector(sceneDidEnterBackground), name: UIScene.didEnterBackgroundNotification, object: nil)
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NotificationCenter.default.publisher(for: .timelinePositionChanged)
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.filter { [unowned self] in
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if Preferences.shared.timelineSyncMode == .icloud,
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let timelinePosition = $0.object as? TimelinePosition,
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timelinePosition.accountID == self.mastodonController.accountInfo?.id,
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timelinePosition.timeline == self.timeline {
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return true
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} else {
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return false
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}
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}
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.debounce(for: .milliseconds(500), scheduler: DispatchQueue.main)
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.sink { [unowned self] _ in
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Task {
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_ = await syncPositionFromICloudIfNecessary(alwaysPrompt: true)
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}
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}
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.store(in: &cancellables)
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NotificationCenter.default.addObserver(self, selector: #selector(handleStatusDeleted), name: .statusDeleted, object: nil)
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if userActivity != nil {
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userActivityNeedsUpdate
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.debounce(for: .seconds(1), scheduler: DispatchQueue.main)
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.sink { [unowned self] _ in
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if let info = self.timelinePositionInfo(),
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let userActivity = self.userActivity {
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UserActivityManager.addTimelinePositionInfo(to: userActivity, statusIDs: info.statusIDs, centerStatusID: info.centerStatusID)
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}
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}
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.store(in: &cancellables)
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}
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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: CollapseState, filterResult: Filterer.Result, precomputedContent: NSAttributedString?) {
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cell.delegate = self
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if case .home = timeline {
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cell.showFollowedHashtags = true
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} else {
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cell.showFollowedHashtags = false
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}
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cell.updateUI(statusID: id, state: state, filterResult: filterResult, precomputedContent: precomputedContent)
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}
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private func createDataSource() -> UICollectionViewDiffableDataSource<Section, Item> {
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let statusCell = UICollectionView.CellRegistration<TimelineStatusCollectionViewCell, (String, CollapseState, Filterer.Result, NSAttributedString?)> { [unowned self] cell, indexPath, item in
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self.configureStatusCell(cell, id: item.0, state: item.1, filterResult: item.2, precomputedContent: item.3)
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}
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let zeroHeightCell = UICollectionView.CellRegistration<ZeroHeightCollectionViewCell, Void> { _, _, _ in
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}
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let gapCell = UICollectionView.CellRegistration<TimelineGapCollectionViewCell, Void> { [unowned self] cell, indexPath, _ in
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cell.showsIndicator = false
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cell.fillGap = { [unowned self] direction in
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await self.controller.fillGap(in: direction)
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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, collapseState: let state, filterState: let filterState):
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let (result, attributedString) = filterResult(state: filterState, statusID: id)
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switch result {
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case .allow, .warn(_):
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return collectionView.dequeueConfiguredReusableCell(using: statusCell, for: indexPath, item: (id, state, result, attributedString))
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case .hide:
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return collectionView.dequeueConfiguredReusableCell(using: zeroHeightCell, for: indexPath, item: ())
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}
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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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clearSelectionOnAppear(animated: animated)
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if case .notLoadedInitial = controller.state {
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Task {
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if await restoreState() {
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await checkPresent(jumpImmediately: false, animateImmediateJump: false)
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} else {
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await controller.loadInitial()
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}
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}
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} else {
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syncAndCheckPresentIfEnoughTimeElapsed()
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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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disappearedAt = Date()
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saveState()
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}
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private func currentCenterVisibleIndexPath(snapshot: NSDiffableDataSourceSnapshot<Section, Item>?) -> IndexPath? {
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let snapshot = snapshot ?? dataSource.snapshot()
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let visible = collectionView.indexPathsForVisibleItems.sorted()
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let visibleRect = CGRect(origin: collectionView.contentOffset, size: collectionView.bounds.size)
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let midPoint = CGPoint(x: visibleRect.midX, y: visibleRect.midY)
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guard !visible.isEmpty,
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let statusesSection = snapshot.sectionIdentifiers.firstIndex(of: .statuses),
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let rawCenterVisible = collectionView.indexPathForItem(at: midPoint),
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let centerVisible = visible.first(where: { $0.section == statusesSection && $0 >= rawCenterVisible }) else {
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return nil
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}
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return centerVisible
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}
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private func timelinePositionInfo() -> (statusIDs: [String], centerStatusID: String)? {
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guard isViewLoaded else {
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return nil
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}
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let snapshot = dataSource.snapshot()
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guard let centerVisible = currentCenterVisibleIndexPath(snapshot: snapshot) else {
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return nil
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}
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let allItems = snapshot.itemIdentifiers(inSection: .statuses)
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let startIndex = max(0, centerVisible.row - 20)
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let endIndex = min(allItems.count - 1, centerVisible.row + 20)
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let centerVisibleItem: Item
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var items = allItems[startIndex...endIndex]
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if let gapIndex = items.firstIndex(of: .gap) {
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// if the gap is above the top visible item, we take everything below the gap
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// otherwise, we take everything above the gap
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if gapIndex <= centerVisible.row {
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items = allItems[(gapIndex + 1)...endIndex]
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if gapIndex == centerVisible.row {
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centerVisibleItem = allItems.first!
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} else {
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assert(items.indices.contains(centerVisible.row))
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centerVisibleItem = allItems[centerVisible.row]
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}
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} else {
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items = allItems[startIndex..<gapIndex]
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centerVisibleItem = allItems[centerVisible.row]
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}
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} else {
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centerVisibleItem = allItems[centerVisible.row]
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}
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let ids = items.map {
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if case .status(id: let id, _, _) = $0 {
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return id
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} else {
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fatalError()
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}
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}
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let centerVisibleID: String
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if case .status(id: let id, _, _) = centerVisibleItem {
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centerVisibleID = id
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} else {
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fatalError()
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}
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return (ids, centerVisibleID)
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}
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private func saveState() {
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guard persistsState,
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let accountInfo = mastodonController.accountInfo,
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let (ids, centerVisibleID) = timelinePositionInfo() else {
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return
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}
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switch Preferences.shared.timelineSyncMode {
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case .icloud:
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stateRestorationLogger.debug("TimelineViewController: saving state to persistent store with with centerID \(centerVisibleID)")
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let context = mastodonController.persistentContainer.viewContext
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let position = mastodonController.persistentContainer.getTimelinePosition(timeline: timeline) ?? TimelinePosition(timeline: timeline, account: accountInfo, context: context)
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position.statusIDs = ids
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position.centerStatusID = centerVisibleID
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mastodonController.persistentContainer.save(context: context)
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case .mastodon:
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guard case .home = timeline else {
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return
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}
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stateRestorationLogger.debug("TimelineViewController: updating timeline marker with last read ID \(centerVisibleID)")
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Task {
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do {
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let req = TimelineMarkers.update(timeline: .home, lastReadID: centerVisibleID)
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_ = try await mastodonController.run(req)
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} catch {
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stateRestorationLogger.error("TimelineViewController: failed to update timeline marker: \(String(describing: error))")
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let event = Event(error: error)
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event.message = SentryMessage(formatted: "Failed to update timeline marker")
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SentrySDK.capture(event: event)
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}
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}
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}
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}
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func stateRestorationActivity() -> NSUserActivity? {
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guard isViewLoaded,
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let currentAccountID = mastodonController.accountInfo?.id else {
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return nil
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}
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let activity = UserActivityManager.showTimelineActivity(timeline: timeline, accountID: currentAccountID)!
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activity.isEligibleForPrediction = false
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return activity
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}
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func restoreState() async -> Bool {
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guard persistsState,
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Preferences.shared.timelineStateRestoration else {
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return false
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}
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loadViewIfNeeded()
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var loaded = false
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await controller.restoreInitial { @MainActor in
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switch Preferences.shared.timelineSyncMode {
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case .icloud:
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guard let position = mastodonController.persistentContainer.getTimelinePosition(timeline: timeline) else {
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return
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}
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let hasStatusesToRestore = await loadStatusesToRestore(position: position)
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if hasStatusesToRestore {
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applyItemsToRestore(position: position)
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loaded = true
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}
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case .mastodon:
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guard case .home = timeline else {
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return
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}
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loaded = await restoreStatusesFromMarkerPosition()
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}
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}
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return loaded
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}
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func restoreStateFromHandoff(statusIDs: [String], centerStatusID: String) async {
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let crumb = Breadcrumb(level: .debug, category: "TimelineViewController")
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crumb.message = "Restoring state from handoff activity"
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SentrySDK.addBreadcrumb(crumb)
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await controller.restoreInitial { @MainActor in
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let position = TimelinePosition(context: mastodonController.persistentContainer.viewContext)
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position.statusIDs = statusIDs
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position.centerStatusID = centerStatusID
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let hasStatusesToRestore = await loadStatusesToRestore(position: position)
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if hasStatusesToRestore {
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applyItemsToRestore(position: position)
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}
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mastodonController.persistentContainer.viewContext.delete(position)
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}
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}
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@MainActor
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private func loadStatusesToRestore(position: TimelinePosition) async -> Bool {
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let originalPositionStatusIDs = position.statusIDs
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let unloaded = position.statusIDs.filter({ mastodonController.persistentContainer.status(for: $0) == nil })
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guard !unloaded.isEmpty else {
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return true
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}
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let results = await withTaskGroup(of: (String, Result<Status, Swift.Error>).self) { group -> [(String, Result<Status, Swift.Error>)] in
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for id in unloaded {
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group.addTask {
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do {
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let (status, _) = try await self.mastodonController.run(Client.getStatus(id: id))
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return (id, .success(status))
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} catch {
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return (id, .failure(error))
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}
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}
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}
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return await group.reduce(into: []) { partialResult, result in
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partialResult.append(result)
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}
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}
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var statuses = [Status]()
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for (id, result) in results {
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|
switch result {
|
|
case .success(let status):
|
|
statuses.append(status)
|
|
case .failure(let error):
|
|
let crumb = Breadcrumb(level: .error, category: "TimelineViewController")
|
|
crumb.message = "Error loading status"
|
|
crumb.data = [
|
|
"error": String(describing: error),
|
|
"id": id
|
|
]
|
|
SentrySDK.addBreadcrumb(crumb)
|
|
}
|
|
}
|
|
await mastodonController.persistentContainer.addAll(statuses: statuses, in: mastodonController.persistentContainer.viewContext)
|
|
|
|
// if an icloud sync completed in between starting to load the statuses and finishing, try to load again
|
|
if position.statusIDs != originalPositionStatusIDs {
|
|
let crumb = Breadcrumb(level: .info, category: "TimelineViewController")
|
|
crumb.message = "TimelinePosition statusIDs changed, retrying load"
|
|
SentrySDK.addBreadcrumb(crumb)
|
|
return await loadStatusesToRestore(position: position)
|
|
}
|
|
|
|
// update the timeline position in case some statuses couldn't be loaded
|
|
if let center = position.centerStatusID,
|
|
let centerIndex = position.statusIDs.firstIndex(of: center) {
|
|
let nearestLoadedStatusToCenter = position.statusIDs[centerIndex...].first(where: { id in
|
|
// was already loaded or was just now loaded
|
|
!unloaded.contains(id) || statuses.contains(where: { $0.id == id })
|
|
})
|
|
position.centerStatusID = nearestLoadedStatusToCenter
|
|
}
|
|
position.statusIDs = position.statusIDs.filter { id in
|
|
!unloaded.contains(id) || statuses.contains(where: { $0.id == id })
|
|
}
|
|
|
|
return !position.statusIDs.isEmpty
|
|
}
|
|
|
|
@MainActor
|
|
private func applyItemsToRestore(position: TimelinePosition) {
|
|
var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
|
|
snapshot.appendSections([.statuses])
|
|
let statusIDs = position.statusIDs
|
|
let centerStatusID = position.centerStatusID
|
|
let items = position.statusIDs.map { Item.status(id: $0, collapseState: .unknown, filterState: .unknown) }
|
|
snapshot.appendItems(items, toSection: .statuses)
|
|
let crumb = Breadcrumb(level: .info, category: "TimelineViewController")
|
|
crumb.message = "Restoring statuses"
|
|
crumb.data = [
|
|
"statusIDs": position.statusIDs
|
|
]
|
|
SentrySDK.addBreadcrumb(crumb)
|
|
dataSource.apply(snapshot, animatingDifferences: false) {
|
|
if let centerStatusID,
|
|
let index = statusIDs.firstIndex(of: centerStatusID) {
|
|
self.scrollToItem(item: items[index])
|
|
stateRestorationLogger.fault("TimelineViewController: restored statuses with center ID \(centerStatusID)")
|
|
} else {
|
|
stateRestorationLogger.fault("TimelineViewController: restored statuses, but couldn't find center ID")
|
|
}
|
|
}
|
|
}
|
|
|
|
@MainActor
|
|
private func restoreStatusesFromMarkerPosition() async -> Bool {
|
|
do {
|
|
let (marker, _) = try await mastodonController.run(TimelineMarkers.request(timelines: [.home]))
|
|
guard let home = marker.home else {
|
|
return false
|
|
}
|
|
async let status = try await mastodonController.run(Client.getStatus(id: home.lastReadID)).0
|
|
async let olderStatuses = try await mastodonController.run(Client.getStatuses(timeline: .home, range: .before(id: home.lastReadID, count: Self.pageSize))).0
|
|
|
|
let allStatuses = try await [status] + olderStatuses
|
|
await mastodonController.persistentContainer.addAll(statuses: allStatuses)
|
|
|
|
var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
|
|
snapshot.appendSections([.statuses])
|
|
let items = allStatuses.map { Item.status(id: $0.id, collapseState: .unknown, filterState: .unknown) }
|
|
snapshot.appendItems(items)
|
|
await dataSource.apply(snapshot, animatingDifferences: false)
|
|
collectionView.contentOffset = CGPoint(x: 0, y: -collectionView.adjustedContentInset.top)
|
|
|
|
stateRestorationLogger.debug("TimelineViewController: restored from timeline marker with last read ID: \(home.lastReadID)")
|
|
|
|
return true
|
|
} catch {
|
|
stateRestorationLogger.error("TimelineViewController: failed to load from timeline marker: \(String(describing: error))")
|
|
let event = Event(error: error)
|
|
event.message = SentryMessage(formatted: "Failed to load from timeline marker")
|
|
SentrySDK.capture(event: event)
|
|
return false
|
|
}
|
|
}
|
|
|
|
private func scrollToItem(item: Item) {
|
|
guard let indexPath = dataSource.indexPath(for: item) else {
|
|
return
|
|
}
|
|
// it sometimes takes multiple attempts to convert on the right scroll position
|
|
// since we're dealing with a bunch of unmeasured cells, so just try a few times in a loop
|
|
var count = 0
|
|
while count < 5 {
|
|
count += 1
|
|
let origOffset = self.collectionView.contentOffset
|
|
self.collectionView.layoutIfNeeded()
|
|
self.collectionView.scrollToItem(at: indexPath, at: .centeredVertically, animated: false)
|
|
let newOffset = self.collectionView.contentOffset
|
|
if abs(origOffset.y - newOffset.y) <= 1 {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
private func removeTimelineDescriptionCell() {
|
|
var snapshot = dataSource.snapshot()
|
|
snapshot.deleteItems([.publicTimelineDescription])
|
|
dataSource.apply(snapshot, animatingDifferences: true)
|
|
isShowingTimelineDescription = false
|
|
}
|
|
|
|
private func filterResult(state: FilterState, statusID: String) -> (Filterer.Result, NSAttributedString?) {
|
|
let status = {
|
|
guard let status = self.mastodonController.persistentContainer.status(for: statusID) else {
|
|
let crumb = Breadcrumb(level: .fatal, category: "TimelineViewController")
|
|
crumb.message = "Looking up status \(statusID)"
|
|
SentrySDK.addBreadcrumb(crumb)
|
|
preconditionFailure("Missing status for filtering")
|
|
}
|
|
// if the status is a reblog of another one, filter based on that one
|
|
if let reblogged = status.reblog {
|
|
return (reblogged, true)
|
|
} else {
|
|
return (status, false)
|
|
}
|
|
}
|
|
return filterer.resolve(state: state, status: status)
|
|
}
|
|
|
|
private func reapplyFilters(actionsChanged: Bool) {
|
|
let visible = collectionView.indexPathsForVisibleItems
|
|
let items = visible
|
|
.compactMap { dataSource.itemIdentifier(for: $0) }
|
|
.filter {
|
|
if case .status(_, _, _) = $0 {
|
|
return true
|
|
} else {
|
|
return false
|
|
}
|
|
}
|
|
guard !items.isEmpty else {
|
|
return
|
|
}
|
|
var snapshot = dataSource.snapshot()
|
|
if actionsChanged {
|
|
// need to reload not just reconfigure because hidden posts use a separate cell type
|
|
snapshot.reloadItems(items)
|
|
} else {
|
|
// reconfigure when possible to avoid the content offset jumping around
|
|
snapshot.reconfigureItems(items)
|
|
}
|
|
dataSource.apply(snapshot)
|
|
}
|
|
|
|
@objc private func sceneWillEnterForeground(_ notification: Foundation.Notification) {
|
|
guard let scene = notification.object as? UIScene,
|
|
// view.window is nil when the VC is not on screen
|
|
view.window?.windowScene == scene else {
|
|
return
|
|
}
|
|
syncAndCheckPresentIfEnoughTimeElapsed()
|
|
}
|
|
|
|
@objc private func sceneDidEnterBackground(_ notification: Foundation.Notification) {
|
|
guard let scene = notification.object as? UIScene,
|
|
// view.window is nil when the VC is not on screen
|
|
view.window?.windowScene == scene else {
|
|
return
|
|
}
|
|
disappearedAt = Date()
|
|
saveState()
|
|
}
|
|
|
|
func syncPositionIfNecessary(alwaysPrompt: Bool) async -> Bool {
|
|
switch Preferences.shared.timelineSyncMode {
|
|
case .icloud:
|
|
return await syncPositionFromICloudIfNecessary(alwaysPrompt: alwaysPrompt)
|
|
case .mastodon:
|
|
return await restoreStatusesFromMarkerPosition()
|
|
}
|
|
}
|
|
|
|
private func syncPositionFromICloudIfNecessary(alwaysPrompt: Bool) async -> Bool {
|
|
guard persistsState,
|
|
let timelinePosition = mastodonController.persistentContainer.getTimelinePosition(timeline: timeline) else {
|
|
return false
|
|
}
|
|
let snapshot = dataSource.snapshot()
|
|
guard let centerVisible = currentCenterVisibleIndexPath(snapshot: snapshot),
|
|
snapshot.sectionIdentifiers.contains(.statuses) else {
|
|
return false
|
|
}
|
|
let statusesSection = snapshot.itemIdentifiers(inSection: .statuses)
|
|
let centerVisibleStatusID: String
|
|
switch statusesSection[centerVisible.row] {
|
|
case .gap:
|
|
guard case .status(let id, _, _) = statusesSection[centerVisible.row + 1] else {
|
|
fatalError()
|
|
}
|
|
centerVisibleStatusID = id
|
|
case .status(let id, _, _):
|
|
centerVisibleStatusID = id
|
|
default:
|
|
fatalError()
|
|
}
|
|
guard timelinePosition.centerStatusID != centerVisibleStatusID else {
|
|
return false
|
|
}
|
|
stateRestorationLogger.info("Potential restore with centerStatusID: \(timelinePosition.centerStatusID ?? "<none>")")
|
|
if !alwaysPrompt {
|
|
_ = await restoreState()
|
|
} else {
|
|
var config = ToastConfiguration(title: "Sync Position")
|
|
config.edge = .top
|
|
config.dismissAutomaticallyAfter = 5
|
|
config.systemImageName = "arrow.triangle.2.circlepath"
|
|
config.action = { [unowned self] toast in
|
|
toast.isUserInteractionEnabled = false
|
|
UIView.animateKeyframes(withDuration: 1, delay: 0, options: .repeat) {
|
|
UIView.addKeyframe(withRelativeStartTime: 0, relativeDuration: 0.5) {
|
|
toast.imageView!.transform = CGAffineTransform(rotationAngle: 0.5 * .pi)
|
|
}
|
|
UIView.addKeyframe(withRelativeStartTime: 0.5, relativeDuration: 0.5) {
|
|
// the translation is because the symbol isn't perfectly centered
|
|
toast.imageView!.transform = CGAffineTransform(translationX: -0.5, y: 0).rotated(by: .pi)
|
|
}
|
|
}
|
|
Task {
|
|
_ = await self.restoreState()
|
|
toast.dismissToast(animated: true)
|
|
}
|
|
}
|
|
config.onAppear = { [unowned self] animator in
|
|
self.delegate?.timelineViewController(self, willShowSyncToastWith: animator)
|
|
}
|
|
config.onDismiss = { [unowned self] animator in
|
|
self.delegate?.timelineViewController(self, willDismissSyncToastWith: animator)
|
|
}
|
|
showToast(configuration: config, animated: true)
|
|
UIAccessibility.post(notification: .announcement, argument: "Synced Position Updated")
|
|
}
|
|
return true
|
|
}
|
|
|
|
@objc func refresh() {
|
|
Task {
|
|
if case .notLoadedInitial = controller.state {
|
|
await controller.loadInitial()
|
|
#if !targetEnvironment(macCatalyst)
|
|
collectionView.refreshControl?.endRefreshing()
|
|
#endif
|
|
} else {
|
|
@MainActor
|
|
func loadNewerAndEndRefreshing() async {
|
|
await controller.loadNewer()
|
|
#if !targetEnvironment(macCatalyst)
|
|
collectionView.refreshControl?.endRefreshing()
|
|
#endif
|
|
}
|
|
|
|
// I'm not sure whether this should move into TimelineLikeController/TimelineLikeCollectionViewController
|
|
let (_, presentItems) = await (loadNewerAndEndRefreshing(), try? loadInitial())
|
|
if let presentItems, !presentItems.isEmpty {
|
|
insertPresentItemsAndShowJumpToast(presentItems)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
private func syncAndCheckPresentIfEnoughTimeElapsed() {
|
|
guard let disappearedAt,
|
|
-disappearedAt.timeIntervalSinceNow > 60 * 60 /* 1 hour */ else {
|
|
return
|
|
}
|
|
self.disappearedAt = nil
|
|
Task {
|
|
if await syncPositionIfNecessary(alwaysPrompt: false) {
|
|
// no-op
|
|
} else {
|
|
await checkPresent(jumpImmediately: false, animateImmediateJump: false)
|
|
}
|
|
}
|
|
}
|
|
|
|
func checkPresent(jumpImmediately: Bool, animateImmediateJump: Bool) async {
|
|
guard case .idle = controller.state,
|
|
let presentItems = try? await loadInitial(),
|
|
!presentItems.isEmpty else {
|
|
return
|
|
}
|
|
if jumpImmediately {
|
|
var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
|
|
snapshot.appendSections([.statuses])
|
|
snapshot.appendItems(presentItems.map { .status(id: $0, collapseState: .unknown, filterState: .unknown) }, toSection: .statuses)
|
|
dataSource.apply(snapshot, animatingDifferences: animateImmediateJump) {
|
|
self.collectionView.scrollToItem(at: IndexPath(row: 0, section: 0), at: .top, animated: animateImmediateJump)
|
|
UIAccessibility.post(notification: .screenChanged, argument: self.collectionView.cellForItem(at: IndexPath(row: 0, section: 0)))
|
|
}
|
|
} else {
|
|
insertPresentItemsAndShowJumpToast(presentItems)
|
|
}
|
|
}
|
|
|
|
private func insertPresentItemsAndShowJumpToast(_ presentItems: [String]) {
|
|
var snapshot = dataSource.snapshot()
|
|
guard snapshot.indexOfSection(.statuses) != nil else {
|
|
return
|
|
}
|
|
let currentItems = snapshot.itemIdentifiers(inSection: .statuses)
|
|
func currentItemsContains(id: String) -> Bool {
|
|
return currentItems.contains { item in
|
|
switch item {
|
|
case .status(id: id, collapseState: _, filterState: _):
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
}
|
|
}
|
|
// if there's no overlap between presentItems and the existing items in the data source, prompt the user
|
|
// we can't be clever here by just checking the first id in currentItems against presentItems, since that may belong to a since-unfollowed user
|
|
if !presentItems.contains(where: { currentItemsContains(id: $0) }) {
|
|
let applySnapshotBeforeScrolling: Bool
|
|
|
|
// remove any existing gap, if there is one
|
|
if let index = currentItems.lastIndex(of: .gap) {
|
|
snapshot.deleteItems(Array(currentItems[index...]))
|
|
|
|
let statusesSection = snapshot.indexOfSection(.statuses)!
|
|
if collectionView.indexPathsForVisibleItems.contains(IndexPath(row: index, section: statusesSection)) {
|
|
// the gap cell is on screen
|
|
applySnapshotBeforeScrolling = false
|
|
} else if let topMostVisibleCell = collectionView.indexPathsForVisibleItems.first(where: { $0.section == statusesSection }),
|
|
index < topMostVisibleCell.row {
|
|
// the gap cell is above the top, so applying the snapshot would remove the currently-viewed statuses
|
|
applySnapshotBeforeScrolling = false
|
|
} else {
|
|
// the gap cell is below the bottom of the screen
|
|
applySnapshotBeforeScrolling = true
|
|
}
|
|
} else {
|
|
// there is no existing gap
|
|
applySnapshotBeforeScrolling = true
|
|
}
|
|
if let first = currentItems.first {
|
|
snapshot.insertItems([.gap], beforeItem: first)
|
|
} else {
|
|
snapshot.appendItems([.gap], toSection: .statuses)
|
|
}
|
|
snapshot.insertItems(presentItems.map { .status(id: $0, collapseState: .unknown, filterState: .unknown) }, beforeItem: .gap)
|
|
|
|
if applySnapshotBeforeScrolling {
|
|
if let firstVisibleIndexPath = collectionView.indexPathsForVisibleItems.min() {
|
|
let firstVisibleItem = dataSource.itemIdentifier(for: firstVisibleIndexPath)!
|
|
applySnapshot(snapshot, maintainingBottomRelativeScrollPositionOf: firstVisibleItem)
|
|
} else {
|
|
dataSource.apply(snapshot, animatingDifferences: false)
|
|
}
|
|
}
|
|
|
|
var config = ToastConfiguration(title: "Jump to Present")
|
|
config.edge = .top
|
|
config.systemImageName = "arrow.up"
|
|
config.dismissAutomaticallyAfter = 4
|
|
config.action = { [unowned self] toast in
|
|
toast.dismissToast(animated: true)
|
|
|
|
let origSnapshot = self.dataSource.snapshot()
|
|
let origItemAtTop: (Item, CGFloat)?
|
|
if let statusesSection = origSnapshot.indexOfSection(.statuses),
|
|
let indexPath = self.collectionView.indexPathsForVisibleItems.sorted().first(where: { $0.section == statusesSection }),
|
|
let cell = self.collectionView.cellForItem(at: indexPath),
|
|
let item = self.dataSource.itemIdentifier(for: indexPath) {
|
|
origItemAtTop = (item, cell.convert(.zero, to: self.view).y - self.view.safeAreaInsets.top)
|
|
} else {
|
|
origItemAtTop = nil
|
|
}
|
|
|
|
// when the user explicitly taps Jump to Present, we drop all the old items to let infinite scrolling work properly when they scroll back down
|
|
var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
|
|
snapshot.appendSections([.statuses])
|
|
snapshot.appendItems(presentItems.map { .status(id: $0, collapseState: .unknown, filterState: .unknown) }, toSection: .statuses)
|
|
// don't animate the snapshot change, the scrolling animation will paper over the switch
|
|
self.dataSource.apply(snapshot, animatingDifferences: false) {
|
|
self.collectionView.scrollToItem(at: IndexPath(row: 0, section: 0), at: .top, animated: true)
|
|
|
|
var config = ToastConfiguration(title: "Go Back")
|
|
config.edge = .top
|
|
config.systemImageName = "arrow.down"
|
|
config.dismissAutomaticallyAfter = 2
|
|
config.action = { [unowned self] toast in
|
|
toast.dismissToast(animated: true)
|
|
// todo: it would be nice if we could animate this, but that doesn't work with the screen-position-maintaining stuff
|
|
if let (item, offset) = origItemAtTop {
|
|
self.applySnapshot(origSnapshot, maintainingScreenPosition: offset, ofItem: item)
|
|
} else {
|
|
self.dataSource.apply(origSnapshot, animatingDifferences: false)
|
|
}
|
|
}
|
|
self.showToast(configuration: config, animated: true)
|
|
}
|
|
}
|
|
config.onAppear = { [unowned self] animator in
|
|
self.delegate?.timelineViewController(self, willShowJumpToPresentToastWith: animator)
|
|
}
|
|
config.onDismiss = { [unowned self] animator in
|
|
self.delegate?.timelineViewController(self, willDismissJumpToPresentToastWith: animator)
|
|
}
|
|
self.showToast(configuration: config, animated: true)
|
|
}
|
|
}
|
|
|
|
// NOTE: this only works when items are being inserted ABOVE the item to maintain
|
|
private func applySnapshot(_ snapshot: NSDiffableDataSourceSnapshot<Section, Item>, maintainingBottomRelativeScrollPositionOf itemToMaintain: Item) {
|
|
var firstItemAfterOriginalGapOffsetFromTop: CGFloat = 0
|
|
if let indexPath = dataSource.indexPath(for: itemToMaintain),
|
|
let cell = collectionView.cellForItem(at: indexPath) {
|
|
// subtract top safe area inset b/c scrollToItem at .top aligns the top of the cell to the top of the safe area
|
|
firstItemAfterOriginalGapOffsetFromTop = cell.convert(.zero, to: view).y - view.safeAreaInsets.top
|
|
}
|
|
applySnapshot(snapshot, maintainingScreenPosition: firstItemAfterOriginalGapOffsetFromTop, ofItem: itemToMaintain)
|
|
}
|
|
|
|
private func applySnapshot(_ snapshot: NSDiffableDataSourceSnapshot<Section, Item>, maintainingScreenPosition offsetFromTop: CGFloat, ofItem itemToMaintain: Item) {
|
|
// use a snapshot of the collection view to hide the flicker as the content offset changes and then changes back
|
|
let snapshotView = collectionView.snapshotView(afterScreenUpdates: false)
|
|
if let snapshotView {
|
|
snapshotView.layer.zPosition = 1000
|
|
snapshotView.frame = view.bounds
|
|
view.addSubview(snapshotView)
|
|
}
|
|
|
|
dataSource.apply(snapshot, animatingDifferences: false) {
|
|
if let indexPathOfItemToMaintain = self.dataSource.indexPath(for: itemToMaintain) {
|
|
// scroll up until we've accumulated enough MEASURED height that we can put the
|
|
// firstItemAfterOriginalGapCell at the top of the screen and then scroll down by
|
|
// firstItemAfterOriginalGapOffsetFromTop without intruding into unmeasured area
|
|
var cur = indexPathOfItemToMaintain
|
|
var amountScrolledUp: CGFloat = 0
|
|
var first = true
|
|
while true {
|
|
if cur.row <= 0 {
|
|
break
|
|
}
|
|
if let cell = self.collectionView.cellForItem(at: indexPathOfItemToMaintain),
|
|
cell.convert(.zero, to: self.view).y - self.view.safeAreaInsets.top > offsetFromTop {
|
|
// if we're breaking from the loop at the first iteration, we need to make sure to still call scrollToItem for the current row
|
|
if first {
|
|
self.collectionView.scrollToItem(at: cur, at: .top, animated: false)
|
|
}
|
|
break
|
|
}
|
|
cur = IndexPath(row: cur.row - 1, section: cur.section)
|
|
self.collectionView.scrollToItem(at: cur, at: .top, animated: false)
|
|
self.collectionView.layoutIfNeeded()
|
|
let attrs = self.collectionView.layoutAttributesForItem(at: cur)!
|
|
amountScrolledUp += attrs.size.height
|
|
first = false
|
|
}
|
|
self.collectionView.contentOffset.y += amountScrolledUp
|
|
self.collectionView.contentOffset.y -= offsetFromTop
|
|
}
|
|
|
|
snapshotView?.removeFromSuperview()
|
|
}
|
|
}
|
|
|
|
@objc private func handleStatusDeleted(_ notification: Foundation.Notification) {
|
|
guard let userInfo = notification.userInfo,
|
|
let accountID = mastodonController.accountInfo?.id,
|
|
userInfo["accountID"] as? String == accountID,
|
|
let statusIDs = userInfo["statusIDs"] as? [String] else {
|
|
return
|
|
}
|
|
var snapshot = self.dataSource.snapshot()
|
|
let toDelete = statusIDs
|
|
.map { id in
|
|
Item.status(id: id, collapseState: .unknown, filterState: .unknown)
|
|
}
|
|
.filter { item in
|
|
snapshot.itemIdentifiers.contains(item)
|
|
}
|
|
if !toDelete.isEmpty {
|
|
snapshot.deleteItems(toDelete)
|
|
self.dataSource.apply(snapshot, animatingDifferences: true)
|
|
}
|
|
}
|
|
|
|
// this is only implemented here so it's overridable by InstanceTimelineViewController
|
|
func handleLoadAllError(_ error: Swift.Error) async {
|
|
let config = ToastConfiguration(from: error, with: "Error Loading", in: self) { [weak self] toast in
|
|
toast.dismissToast(animated: true)
|
|
Task {
|
|
await self?.controller.loadInitial()
|
|
}
|
|
}
|
|
self.showToast(configuration: config, animated: true)
|
|
}
|
|
}
|
|
|
|
extension TimelineViewController {
|
|
enum Section: TimelineLikeCollectionViewSection {
|
|
case header
|
|
case statuses
|
|
case footer
|
|
|
|
static var entries: Self { .statuses }
|
|
}
|
|
enum Item: TimelineLikeCollectionViewItem {
|
|
typealias TimelineItem = String // status ID
|
|
|
|
case status(id: String, collapseState: CollapseState, filterState: FilterState)
|
|
case gap
|
|
case loadingIndicator
|
|
case confirmLoadMore
|
|
case publicTimelineDescription
|
|
|
|
static func fromTimelineItem(_ id: String) -> Self {
|
|
return .status(id: id, collapseState: .unknown, filterState: .unknown)
|
|
}
|
|
|
|
static func ==(lhs: Item, rhs: Item) -> Bool {
|
|
switch (lhs, rhs) {
|
|
case let (.status(id: a, _, _), .status(id: b, _, _)):
|
|
return a == b
|
|
case (.gap, .gap):
|
|
return true
|
|
case (.loadingIndicator, .loadingIndicator):
|
|
return true
|
|
case (.confirmLoadMore, .confirmLoadMore):
|
|
return true
|
|
case (.publicTimelineDescription, .publicTimelineDescription):
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
}
|
|
|
|
func hash(into hasher: inout Hasher) {
|
|
switch self {
|
|
case .status(id: let id, _, _):
|
|
hasher.combine(0)
|
|
hasher.combine(id)
|
|
case .gap:
|
|
hasher.combine(1)
|
|
case .loadingIndicator:
|
|
hasher.combine(2)
|
|
case .confirmLoadMore:
|
|
hasher.combine(3)
|
|
case .publicTimelineDescription:
|
|
hasher.combine(4)
|
|
}
|
|
}
|
|
|
|
var hideSeparators: Bool {
|
|
switch self {
|
|
case .loadingIndicator, .publicTimelineDescription, .confirmLoadMore:
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
}
|
|
|
|
var isSelectable: Bool {
|
|
switch self {
|
|
case .publicTimelineDescription, .gap, .status(_, _, _):
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// MARK: TimelineLikeControllerDelegate
|
|
extension TimelineViewController {
|
|
typealias TimelineItem = String // status ID
|
|
|
|
// the maximum mastodon will provide in a single request
|
|
private static let pageSize = 40
|
|
|
|
func loadInitial() async throws -> [TimelineItem] {
|
|
let request = Client.getStatuses(timeline: timeline, range: .count(TimelineViewController.pageSize))
|
|
let (statuses, _) = try await mastodonController.run(request)
|
|
|
|
await withCheckedContinuation { continuation in
|
|
mastodonController.persistentContainer.addAll(statuses: statuses) {
|
|
continuation.resume()
|
|
}
|
|
}
|
|
|
|
return statuses.map(\.id)
|
|
}
|
|
|
|
func loadNewer() async throws -> [TimelineItem] {
|
|
let statusesSection = dataSource.snapshot().indexOfSection(.statuses)!
|
|
guard case .status(id: let id, _, _) = dataSource.itemIdentifier(for: IndexPath(row: 0, section: statusesSection)) else {
|
|
throw Error.noNewer
|
|
}
|
|
let newer = RequestRange.after(id: id, count: TimelineViewController.pageSize)
|
|
|
|
let request = Client.getStatuses(timeline: timeline, range: newer)
|
|
let (statuses, _) = try await mastodonController.run(request)
|
|
|
|
guard !statuses.isEmpty else {
|
|
throw TimelineViewController.Error.allCaughtUp
|
|
}
|
|
|
|
await withCheckedContinuation { continuation in
|
|
mastodonController.persistentContainer.addAll(statuses: statuses) {
|
|
continuation.resume()
|
|
}
|
|
}
|
|
|
|
return statuses.map(\.id)
|
|
}
|
|
|
|
func loadOlder() async throws -> [TimelineItem] {
|
|
let snapshot = dataSource.snapshot()
|
|
let statusesSection = snapshot.indexOfSection(.statuses)!
|
|
guard case .status(id: let id, _, _) = dataSource.itemIdentifier(for: IndexPath(row: snapshot.numberOfItems(inSection: .statuses) - 1, section: statusesSection)) else {
|
|
throw Error.noNewer
|
|
}
|
|
let older = RequestRange.before(id: id, count: TimelineViewController.pageSize)
|
|
|
|
let request = Client.getStatuses(timeline: timeline, range: older)
|
|
let (statuses, _) = try await mastodonController.run(request)
|
|
|
|
guard !statuses.isEmpty else {
|
|
return []
|
|
}
|
|
|
|
await withCheckedContinuation { continuation in
|
|
mastodonController.persistentContainer.addAll(statuses: statuses) {
|
|
continuation.resume()
|
|
}
|
|
}
|
|
|
|
return statuses.map(\.id)
|
|
}
|
|
|
|
func loadGap(in direction: TimelineGapDirection) async throws -> [TimelineItem] {
|
|
guard let gapIndexPath = dataSource.indexPath(for: .gap) else {
|
|
throw Error.noGap
|
|
}
|
|
let statusItemsCount = collectionView.numberOfItems(inSection: gapIndexPath.section)
|
|
let range: RequestRange
|
|
switch direction {
|
|
case .above:
|
|
guard gapIndexPath.row > 0,
|
|
case .status(id: let id, _, _) = dataSource.itemIdentifier(for: IndexPath(row: gapIndexPath.row - 1, section: gapIndexPath.section)) else {
|
|
// not really the right error but w/e
|
|
throw Error.noGap
|
|
}
|
|
range = .before(id: id, count: TimelineViewController.pageSize)
|
|
case .below:
|
|
guard gapIndexPath.row < statusItemsCount - 1,
|
|
case .status(id: let id, _, _) = dataSource.itemIdentifier(for: IndexPath(row: gapIndexPath.row + 1, section: gapIndexPath.section)) else {
|
|
throw Error.noGap
|
|
}
|
|
range = .after(id: id, count: TimelineViewController.pageSize)
|
|
}
|
|
|
|
let request = Client.getStatuses(timeline: timeline, range: range)
|
|
let (statuses, _) = try await mastodonController.run(request)
|
|
|
|
guard !statuses.isEmpty else {
|
|
return []
|
|
}
|
|
|
|
// NOTE: closing the gap (if necessary) happens in handleFillGap
|
|
|
|
await withCheckedContinuation { continuation in
|
|
mastodonController.persistentContainer.addAll(statuses: statuses) {
|
|
continuation.resume()
|
|
}
|
|
}
|
|
|
|
return statuses.map(\.id)
|
|
}
|
|
|
|
func handleLoadGapError(_ error: Swift.Error, direction: TimelineGapDirection) async {
|
|
// TODO: better title, involving direction?
|
|
let config = ToastConfiguration(from: error, with: "Error Loading", in: self) { [weak self] toast in
|
|
toast.dismissToast(animated: true)
|
|
Task {
|
|
await self?.controller.fillGap(in: direction)
|
|
}
|
|
}
|
|
self.showToast(configuration: config, animated: true)
|
|
}
|
|
|
|
func handleFillGap(_ timelineItems: [String], direction: TimelineGapDirection) async {
|
|
var snapshot = dataSource.snapshot()
|
|
let addedItems: Bool
|
|
|
|
let statusItems = snapshot.itemIdentifiers(inSection: .statuses)
|
|
let gapIndex = statusItems.firstIndex(of: .gap)!
|
|
|
|
switch direction {
|
|
case .above:
|
|
// dropFirst to remove .gap item
|
|
let afterGap = statusItems[gapIndex...].dropFirst().prefix(20)
|
|
precondition(!afterGap.contains(.gap))
|
|
|
|
// 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, _, _) = 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, collapseState: .unknown, filterState: .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])
|
|
}
|
|
|
|
await apply(snapshot, animatingDifferences: !addedItems)
|
|
|
|
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, _, _) = 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, collapseState: .unknown, filterState: .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 addedItems {
|
|
let firstItemAfterOriginalGap = statusItems[gapIndex + 1]
|
|
applySnapshot(snapshot, maintainingBottomRelativeScrollPositionOf: firstItemAfterOriginalGap)
|
|
} else {
|
|
dataSource.apply(snapshot, animatingDifferences: true) {}
|
|
}
|
|
}
|
|
|
|
// 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)
|
|
}
|
|
}
|
|
|
|
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, collapseState: let collapseState, filterState: let filterState):
|
|
if filterState.isWarning {
|
|
filterer.setResult(.allow, for: filterState)
|
|
collectionView.deselectItem(at: indexPath, animated: true)
|
|
var snapshot = dataSource.snapshot()
|
|
snapshot.reconfigureItems([item])
|
|
dataSource.apply(snapshot, animatingDifferences: true)
|
|
} else {
|
|
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: collapseState.copy())
|
|
}
|
|
case .gap:
|
|
let cell = collectionView.cellForItem(at: indexPath) as! TimelineGapCollectionViewCell
|
|
cell.showsIndicator = true
|
|
Task {
|
|
await controller.fillGap(in: cell.direction)
|
|
cell.showsIndicator = false
|
|
}
|
|
case .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()
|
|
}
|
|
}
|
|
|
|
func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
|
|
if !decelerate {
|
|
userActivityNeedsUpdate.send()
|
|
}
|
|
}
|
|
|
|
func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
|
|
userActivityNeedsUpdate.send()
|
|
}
|
|
}
|
|
|
|
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)
|
|
}
|
|
}
|
|
|
|
func statusCellShowFiltered(_ cell: StatusCollectionViewCell) {
|
|
if let indexPath = collectionView.indexPath(for: cell),
|
|
let item = dataSource.itemIdentifier(for: indexPath),
|
|
case .status(id: _, collapseState: _, filterState: let filterState) = item {
|
|
filterer.setResult(.allow, for: filterState)
|
|
var snapshot = dataSource.snapshot()
|
|
snapshot.reconfigureItems([item])
|
|
dataSource.apply(snapshot, animatingDifferences: true)
|
|
}
|
|
}
|
|
}
|
|
|
|
extension TimelineViewController: TabBarScrollableViewController {
|
|
func tabBarScrollToTop() {
|
|
collectionView.scrollToTop()
|
|
}
|
|
}
|
|
|
|
extension TimelineViewController: StatusBarTappableViewController {
|
|
func handleStatusBarTapped(xPosition: CGFloat) -> StatusBarTapActionResult {
|
|
collectionView.scrollToTop()
|
|
return .stop
|
|
}
|
|
}
|