448 lines
18 KiB
Swift
448 lines
18 KiB
Swift
//
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// LocalPredicateStatusesViewController.swift
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// Tusker
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//
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// Created by Shadowfacts on 2/4/23.
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// Copyright © 2023 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 CoreData
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class LocalPredicateStatusesViewController: UIViewController, CollectionViewController, RefreshableViewController {
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private static let pageSize = 40
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let mastodonController: MastodonController
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private let predicate: (StatusMO) -> Bool
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private let predicateTitle: String
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private let request: (RequestRange) -> Request<[Status]>
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var collectionView: UICollectionView! {
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view as? UICollectionView
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}
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private var dataSource: UICollectionViewDiffableDataSource<Section, Item>!
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private var state = State.unloaded
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private var newer: RequestRange?
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private var older: RequestRange?
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init(predicate: @escaping (StatusMO) -> Bool, predicateTitle: String, request: @escaping (RequestRange) -> Request<[Status]>, mastodonController: MastodonController) {
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self.mastodonController = mastodonController
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self.predicate = predicate
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self.predicateTitle = predicateTitle
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self.request = request
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super.init(nibName: nil, bundle: nil)
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self.title = predicateTitle
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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.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, sectionConfig in
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guard let item = dataSource.itemIdentifier(for: indexPath) else {
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return sectionConfig
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}
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var config = sectionConfig
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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 {
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config.topSeparatorInsets = TimelineStatusCollectionViewCell.separatorInsets
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config.bottomSeparatorInsets = TimelineStatusCollectionViewCell.separatorInsets
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}
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return config
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}
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let layout = UICollectionViewCompositionalLayout { sectionIndex, environment in
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let section = NSCollectionLayoutSection.list(using: config, layoutEnvironment: environment)
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section.readableContentInset(in: environment)
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return section
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}
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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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collectionView.allowsFocus = true
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dataSource = createDataSource()
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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)> { [unowned self] cell, indexPath, item in
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cell.delegate = self
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cell.updateUI(statusID: item.0, state: item.1, filterResult: .allow, precomputedContent: nil)
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}
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let loadingCell = UICollectionView.CellRegistration<LoadingCollectionViewCell, Void> { cell, indexPath, itemIdentifier in
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cell.indicator.startAnimating()
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}
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return UICollectionViewDiffableDataSource(collectionView: collectionView) { collectionView, indexPath, itemIdentifier in
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switch itemIdentifier {
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case .status(id: let id, state: let state, addedLocally: _):
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return collectionView.dequeueConfiguredReusableCell(using: statusCell, for: indexPath, item: (id, state))
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case .loadingIndicator:
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return collectionView.dequeueConfiguredReusableCell(using: loadingCell, for: indexPath, item: ())
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}
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}
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}
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override func viewDidLoad() {
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super.viewDidLoad()
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#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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addKeyCommand(MenuController.refreshCommand(discoverabilityTitle: "Refresh \(predicateTitle)"))
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NotificationCenter.default.addObserver(self, selector: #selector(handleStatusDeleted), name: .statusDeleted, object: mastodonController)
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NotificationCenter.default.addObserver(self, selector: #selector(managedObjectsDidChange), name: .NSManagedObjectContextObjectsDidChange, object: mastodonController.persistentContainer.viewContext)
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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 .unloaded = state {
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Task {
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await loadInitial()
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}
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}
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}
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private func apply(snapshot: NSDiffableDataSourceSnapshot<Section, Item>, animatingDifferences: Bool) async {
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await Task { @MainActor in
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self.dataSource.apply(snapshot, animatingDifferences: animatingDifferences)
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}.value
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}
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@MainActor
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private func loadInitial() async {
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state = .loadingInitial
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var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
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snapshot.appendSections([.statuses])
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snapshot.appendItems([.loadingIndicator])
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await apply(snapshot: snapshot, animatingDifferences: false)
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do {
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let req = request(.count(Self.pageSize))
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let (statuses, pagination) = try await mastodonController.run(req)
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newer = pagination?.newer
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older = pagination?.older
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await mastodonController.persistentContainer.addAll(statuses: statuses)
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var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
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snapshot.appendSections([.statuses])
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snapshot.appendItems(statuses.map { .status(id: $0.id, state: .unknown, addedLocally: false) })
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await apply(snapshot: snapshot, animatingDifferences: true)
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state = .loaded
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} catch {
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let config = ToastConfiguration(from: error, with: "Error Loading \(predicateTitle)", in: self) { [weak self] toast in
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toast.dismissToast(animated: true)
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await self?.loadInitial()
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}
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showToast(configuration: config, animated: true)
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await apply(snapshot: NSDiffableDataSourceSnapshot(), animatingDifferences: false)
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state = .unloaded
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}
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}
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@MainActor
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private func loadOlder() async {
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guard case .loaded = state,
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let older else {
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return
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}
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state = .loadingOlder
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var snapshot = dataSource.snapshot()
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snapshot.appendItems([.loadingIndicator])
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await apply(snapshot: snapshot, animatingDifferences: false)
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do {
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let req = request(older.withCount(Self.pageSize))
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let (statuses, pagination) = try await mastodonController.run(req)
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self.older = pagination?.older
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await mastodonController.persistentContainer.addAll(statuses: statuses)
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snapshot.deleteItems([.loadingIndicator])
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snapshot.appendItems(statuses.map { .status(id: $0.id, state: .unknown, addedLocally: false) })
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await apply(snapshot: snapshot, animatingDifferences: true)
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} catch {
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let config = ToastConfiguration(from: error, with: "Error Loading Older \(predicateTitle)", in: self) { [weak self] toast in
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toast.dismissToast(animated: true)
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await self?.loadOlder()
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}
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showToast(configuration: config, animated: true)
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var snapshot = dataSource.snapshot()
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snapshot.deleteItems([.loadingIndicator])
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await apply(snapshot: snapshot, animatingDifferences: false)
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}
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state = .loaded
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}
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@objc private func handleStatusDeleted(_ notification: Foundation.Notification) {
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guard let userInfo = notification.userInfo,
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let statusIDs = userInfo["statusIDs"] as? [String] else {
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return
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}
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var snapshot = dataSource.snapshot()
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let toDelete = statusIDs.map { id in
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Item.status(id: id, state: .unknown, addedLocally: false)
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}.filter { item in
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snapshot.itemIdentifiers.contains(item)
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}
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if !toDelete.isEmpty {
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snapshot.deleteItems(toDelete)
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Task {
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await apply(snapshot: snapshot, animatingDifferences: true)
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}
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}
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}
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@objc private func managedObjectsDidChange(_ notification: Foundation.Notification) {
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// only perform local updates while the vc is idle
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// otherwise loading the bookmarks ends up inserting them out of order
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guard case .loaded = state else {
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return
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}
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var snapshot = dataSource.snapshot()
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func prepend(item: Item) {
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if let first = snapshot.itemIdentifiers.first {
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snapshot.insertItems([item], beforeItem: first)
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} else {
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snapshot.appendItems([item])
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}
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}
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var hasChanges = false
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if let inserted = notification.userInfo?[NSInsertedObjectsKey] as? Set<NSManagedObject> {
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for case let status as StatusMO in inserted where predicate(status) {
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prepend(item: .status(id: status.id, state: .unknown, addedLocally: true))
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hasChanges = true
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}
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}
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if let updated = notification.userInfo?[NSUpdatedObjectsKey] as? Set<NSManagedObject> {
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for case let status as StatusMO in updated {
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let item = Item.status(id: status.id, state: .unknown, addedLocally: true)
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let exists = snapshot.itemIdentifiers.contains(item)
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if predicate(status) && !exists {
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prepend(item: item)
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hasChanges = true
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} else if !predicate(status) && exists {
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snapshot.deleteItems([item])
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hasChanges = true
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}
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}
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}
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if hasChanges {
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Task {
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await apply(snapshot: snapshot, animatingDifferences: true)
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}
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}
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}
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// MARK: Interaction
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@objc func refresh() {
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guard case .loaded = state,
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let newer else {
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#if !targetEnvironment(macCatalyst)
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collectionView.refreshControl!.endRefreshing()
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#endif
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return
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}
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state = .loadingNewer
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Task {
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do {
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let req = request(newer.withCount(Self.pageSize))
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let (statuses, pagination) = try await mastodonController.run(req)
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self.newer = pagination?.newer
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await mastodonController.persistentContainer.addAll(statuses: statuses)
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var snapshot = dataSource.snapshot()
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let localItems: [String: CollapseState] = Dictionary(uniqueKeysWithValues: snapshot.itemIdentifiers.compactMap {
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if case .status(id: let id, state: let state, addedLocally: true) = $0 {
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return (id, state)
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} else {
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return nil
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}
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})
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var newItems: [Item] = []
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for status in statuses {
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let state: CollapseState
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if let existing = localItems[status.id] {
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state = existing
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snapshot.deleteItems([.status(id: status.id, state: existing, addedLocally: true)])
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} else {
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state = .unknown
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}
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newItems.append(.status(id: status.id, state: state, addedLocally: false))
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}
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if let first = snapshot.itemIdentifiers.first {
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snapshot.insertItems(newItems, beforeItem: first)
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} else {
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snapshot.appendItems(newItems)
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}
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await apply(snapshot: snapshot, animatingDifferences: true)
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} catch {
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let config = ToastConfiguration(from: error, with: "Error Refreshing \(predicateTitle)", in: self) { [weak self] toast in
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toast.dismissToast(animated: true)
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self?.refresh()
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}
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showToast(configuration: config, animated: true)
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}
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#if !targetEnvironment(macCatalyst)
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collectionView.refreshControl!.endRefreshing()
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#endif
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state = .loaded
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}
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}
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}
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extension LocalPredicateStatusesViewController {
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enum Section {
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case statuses
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}
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enum Item: Equatable, Hashable {
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case status(id: String, state: CollapseState, addedLocally: Bool)
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case loadingIndicator
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var hideSeparators: Bool {
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switch self {
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case .loadingIndicator:
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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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static func ==(lhs: Item, rhs: Item) -> Bool {
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switch (lhs, rhs) {
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case (.status(id: let a, _, _), .status(id: let b, _, _)):
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return a == b
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case (.loadingIndicator, .loadingIndicator):
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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, _, _):
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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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}
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}
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}
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}
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extension LocalPredicateStatusesViewController {
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enum State {
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case unloaded
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case loadingInitial
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case loaded
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case loadingOlder
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case loadingNewer
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}
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}
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extension LocalPredicateStatusesViewController: UICollectionViewDelegate {
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func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
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if indexPath.section == 0,
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indexPath.row == collectionView.numberOfItems(inSection: indexPath.section) - 1 {
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Task {
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await self.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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if case .status(_, _, _) = dataSource.itemIdentifier(for: indexPath) {
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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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func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
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if case .status(id: let id, state: let state, _) = dataSource.itemIdentifier(for: indexPath) {
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selected(status: id, state: state.copy())
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}
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}
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func collectionView(_ collectionView: UICollectionView, contextMenuConfigurationForItemAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration? {
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return (collectionView.cellForItem(at: indexPath) as? TimelineStatusCollectionViewCell)?.contextMenuConfiguration()
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}
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func collectionView(_ collectionView: UICollectionView, willPerformPreviewActionForMenuWith configuration: UIContextMenuConfiguration, animator: UIContextMenuInteractionCommitAnimating) {
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MenuPreviewHelper.willPerformPreviewAction(animator: animator, presenter: self)
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}
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}
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extension LocalPredicateStatusesViewController: UICollectionViewDragDelegate {
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func collectionView(_ collectionView: UICollectionView, itemsForBeginning session: UIDragSession, at indexPath: IndexPath) -> [UIDragItem] {
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return (collectionView.cellForItem(at: indexPath) as? TimelineStatusCollectionViewCell)?.dragItemsForBeginning(session: session) ?? []
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}
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}
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extension LocalPredicateStatusesViewController: TuskerNavigationDelegate {
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var apiController: MastodonController! { mastodonController }
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}
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extension LocalPredicateStatusesViewController: StatusCollectionViewCellDelegate {
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func statusCellNeedsReconfigure(_ cell: StatusCollectionViewCell, animated: Bool, completion: (() -> Void)?) {
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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, completion: completion)
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}
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}
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func statusCellShowFiltered(_ cell: StatusCollectionViewCell) {
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// filtering isn't supported here
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}
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}
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extension LocalPredicateStatusesViewController: TabBarScrollableViewController {
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func tabBarScrollToTop() {
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collectionView.scrollToTop()
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}
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}
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extension LocalPredicateStatusesViewController: StatusBarTappableViewController {
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func handleStatusBarTapped(xPosition: CGFloat) -> StatusBarTapActionResult {
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collectionView.scrollToTop()
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return .stop
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}
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}
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