forked from shadowfacts/Tusker
368 lines
13 KiB
Swift
368 lines
13 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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// TODO: gonna need a thing to replicate all of EnhancedTableViewController
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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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private var newer: RequestRange?
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private var older: RequestRange?
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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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var collectionView: UICollectionView {
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view as! UICollectionView
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}
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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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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 loadView() {
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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 = NSDirectionalEdgeInsets(top: 0, leading: 16, bottom: 0, trailing: 0)
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config.bottomSeparatorInsets = NSDirectionalEdgeInsets(top: 0, leading: 16, bottom: 0, trailing: 0)
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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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view = UICollectionView(frame: .zero, collectionViewLayout: layout)
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collectionView.delegate = self
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collectionView.dragDelegate = self
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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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}
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override func viewDidLoad() {
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super.viewDidLoad()
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}
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private func createDataSource() -> UICollectionViewDiffableDataSource<Section, Item> {
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let statusCell = UICollectionView.CellRegistration<TimelineStatusCollectionViewCell, Item> { [unowned self] cell, indexPath, item in
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guard case .status(id: let id, state: let state) = item,
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let status = mastodonController.persistentContainer.status(for: id) else {
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fatalError()
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}
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cell.mastodonController = mastodonController
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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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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(_, _):
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return collectionView.dequeueConfiguredReusableCell(using: statusCell, for: indexPath, item: itemIdentifier)
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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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private func applyInitialSnapshot() {
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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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var snapshot = dataSource.snapshot()
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snapshot.appendSections([.header])
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snapshot.appendItems([.publicTimelineDescription], toSection: .header)
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dataSource.apply(snapshot, animatingDifferences: false)
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}
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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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await controller.loadInitial()
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}
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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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@objc func refresh() {
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Task {
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await controller.loadNewer()
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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 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 (.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 .loadingIndicator:
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hasher.combine(1)
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case .confirmLoadMore:
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hasher.combine(2)
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case .publicTimelineDescription:
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hasher.combine(3)
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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:
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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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guard let mastodonController else {
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throw Error.noClient
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}
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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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if !statuses.isEmpty {
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newer = .after(id: statuses.first!.id, count: nil)
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older = .before(id: statuses.last!.id, count: nil)
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}
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return await withCheckedContinuation { continuation in
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mastodonController.persistentContainer.addAll(statuses: statuses) {
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continuation.resume(returning: statuses.map(\.id))
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}
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}
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}
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func loadNewer() async throws -> [TimelineItem] {
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guard let newer else {
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throw Error.noNewer
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}
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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 Error.allCaughtUp
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}
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self.newer = .after(id: statuses.first!.id, count: nil)
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return await withCheckedContinuation { continuation in
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mastodonController.persistentContainer.addAll(statuses: statuses) {
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continuation.resume(returning: statuses.map(\.id))
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}
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}
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}
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func loadOlder() async throws -> [TimelineItem] {
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guard let older else {
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throw Error.noOlder
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}
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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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if !statuses.isEmpty {
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self.older = .before(id: statuses.last!.id, count: nil)
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}
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return await withCheckedContinuation { continuation in
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mastodonController.persistentContainer.addAll(statuses: statuses) {
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continuation.resume(returning: statuses.map(\.id))
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}
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}
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}
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enum Error: TimelineLikeCollectionViewError {
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case noClient
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case noNewer
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case noOlder
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case allCaughtUp
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}
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}
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extension TimelineViewController: UICollectionViewDelegate {
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func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
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guard case .statuses = dataSource.sectionIdentifier(for: indexPath.section),
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case .status(_, _) = dataSource.itemIdentifier(for: indexPath) else {
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return
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}
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let itemsInSection = collectionView.numberOfItems(inSection: indexPath.section)
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if indexPath.row == itemsInSection - 1 {
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Task {
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await controller.loadOlder()
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}
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}
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}
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func collectionView(_ collectionView: UICollectionView, shouldSelectItemAt indexPath: IndexPath) -> Bool {
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return dataSource.itemIdentifier(for: indexPath)?.isSelectable ?? false
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}
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func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
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guard let item = dataSource.itemIdentifier(for: indexPath) else {
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return
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}
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switch item {
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case .publicTimelineDescription:
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removeTimelineDescriptionCell()
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case .status(id: let id, state: let state):
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selected(status: id, state: state.copy())
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case .loadingIndicator, .confirmLoadMore:
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fatalError("unreachable")
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}
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}
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func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
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if isShowingTimelineDescription {
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removeTimelineDescriptionCell()
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}
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}
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}
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extension TimelineViewController: UICollectionViewDragDelegate {
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func collectionView(_ collectionView: UICollectionView, itemsForBeginning session: UIDragSession, at indexPath: IndexPath) -> [UIDragItem] {
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(collectionView.cellForItem(at: indexPath) as? TimelineStatusCollectionViewCell)?.dragItemsForBeginning(session: session) ?? []
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}
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}
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extension TimelineViewController: TuskerNavigationDelegate {
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var apiController: MastodonController { mastodonController }
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}
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extension TimelineViewController: MenuActionProvider {
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}
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extension TimelineViewController: StatusCollectionViewCellDelegate {
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func statusCellNeedsReconfigure(_ cell: StatusCollectionViewCell, animated: Bool) {
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if let indexPath = collectionView.indexPath(for: cell) {
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var snapshot = dataSource.snapshot()
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snapshot.reconfigureItems([dataSource.itemIdentifier(for: indexPath)!])
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dataSource.apply(snapshot, animatingDifferences: animated)
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}
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}
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}
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