305 lines
12 KiB
Swift
305 lines
12 KiB
Swift
//
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// TrendingLinksViewController.swift
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// Tusker
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//
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// Created by Shadowfacts on 4/2/22.
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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 WebURLFoundationExtras
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import SafariServices
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import Combine
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class TrendingLinksViewController: UIViewController, CollectionViewController {
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weak var mastodonController: MastodonController!
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var collectionView: UICollectionView!
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private var dataSource: UICollectionViewDiffableDataSource<Section, Item>!
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private var state = State.unloaded
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private let confirmLoadMore = PassthroughSubject<Void, Never>()
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init(mastodonController: MastodonController) {
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self.mastodonController = mastodonController
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super.init(nibName: nil, bundle: nil)
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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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title = NSLocalizedString("Trending Links", comment: "trending links screen title")
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let layout = UICollectionViewCompositionalLayout { [unowned self] sectionIndex, environment in
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switch dataSource.sectionIdentifier(for: sectionIndex) {
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case nil:
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fatalError()
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case .loadingIndicator:
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var config = UICollectionLayoutListConfiguration(appearance: .grouped)
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config.backgroundColor = .appGroupedBackground
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config.showsSeparators = false
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return .list(using: config, layoutEnvironment: environment)
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case .links:
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let size = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1), heightDimension: .estimated(280))
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let item = NSCollectionLayoutItem(layoutSize: size)
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let item2 = NSCollectionLayoutItem(layoutSize: size)
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let group = NSCollectionLayoutGroup.vertical(layoutSize: size, subitems: [item, item2])
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group.contentInsets = NSDirectionalEdgeInsets(top: 0, leading: 16, bottom: 0, trailing: 16)
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group.interItemSpacing = .fixed(16)
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let section = NSCollectionLayoutSection(group: group)
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section.interGroupSpacing = 16
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section.contentInsets = NSDirectionalEdgeInsets(top: 16, leading: 0, bottom: 16, trailing: 0)
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return section
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}
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}
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collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
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collectionView.translatesAutoresizingMaskIntoConstraints = false
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collectionView.delegate = self
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collectionView.dragDelegate = self
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collectionView.backgroundColor = .appGroupedBackground
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collectionView.allowsFocus = true
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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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dataSource = createDataSource()
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}
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private func createDataSource() -> UICollectionViewDiffableDataSource<Section, Item> {
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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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let linkCell = UICollectionView.CellRegistration<TrendingLinkCardCollectionViewCell, Card>(cellNib: UINib(nibName: "TrendingLinkCardCollectionViewCell", bundle: .main)) { cell, indexPath, item in
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cell.verticalSize = .compact
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cell.updateUI(card: item)
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}
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let confirmLoadMoreCell = UICollectionView.CellRegistration<ConfirmLoadMoreCollectionViewCell, Bool> { cell, indexPath, isLoading in
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cell.confirmLoadMore = self.confirmLoadMore
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cell.isLoading = isLoading
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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 .loadingIndicator:
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return collectionView.dequeueConfiguredReusableCell(using: loadingCell, for: indexPath, item: ())
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case .link(let card):
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return collectionView.dequeueConfiguredReusableCell(using: linkCell, for: indexPath, item: card)
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case .confirmLoadMore(let loading):
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return collectionView.dequeueConfiguredReusableCell(using: confirmLoadMoreCell, for: indexPath, item: loading)
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}
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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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Task {
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await loadInitial()
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}
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}
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@MainActor
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private func loadInitial() async {
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guard case .unloaded = state else {
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return
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}
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state = .loading
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var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
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snapshot.appendSections([.loadingIndicator])
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snapshot.appendItems([.loadingIndicator])
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await dataSource.apply(snapshot)
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do {
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let request = Client.getTrendingLinks()
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let (links, _) = try await mastodonController.run(request)
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snapshot.deleteSections([.loadingIndicator])
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snapshot.appendSections([.links])
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snapshot.appendItems(links.map { .link($0) })
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state = .loaded
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await dataSource.apply(snapshot)
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} catch {
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await dataSource.apply(NSDiffableDataSourceSnapshot())
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state = .unloaded
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let config = ToastConfiguration(from: error, with: "Error Loading Trending Links", 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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self.showToast(configuration: config, animated: true)
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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 else {
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return
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}
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state = .loadingOlder
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let origSnapshot = dataSource.snapshot()
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var snapshot = origSnapshot
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if Preferences.shared.disableInfiniteScrolling {
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snapshot.appendSections([.loadingIndicator])
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snapshot.appendItems([.confirmLoadMore(false)], toSection: .loadingIndicator)
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await dataSource.apply(snapshot)
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for await _ in confirmLoadMore.values {
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break
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}
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snapshot.deleteItems([.confirmLoadMore(false)])
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snapshot.appendItems([.confirmLoadMore(true)], toSection: .loadingIndicator)
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await dataSource.apply(snapshot, animatingDifferences: false)
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} else {
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snapshot.appendSections([.loadingIndicator])
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snapshot.appendItems([.loadingIndicator], toSection: .loadingIndicator)
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await dataSource.apply(snapshot)
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}
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do {
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let request = Client.getTrendingLinks(offset: origSnapshot.itemIdentifiers.count)
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let (links, _) = try await mastodonController.run(request)
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var snapshot = origSnapshot
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snapshot.appendItems(links.map { .link($0) }, toSection: .links)
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await dataSource.apply(snapshot)
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} catch {
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await dataSource.apply(origSnapshot)
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let config = ToastConfiguration(from: error, with: "Erorr Loading More Links", 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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self.showToast(configuration: config, animated: true)
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}
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}
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}
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extension TrendingLinksViewController {
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enum State {
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case unloaded
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case loading
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case loaded
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case loadingOlder
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}
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}
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extension TrendingLinksViewController {
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enum Section {
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case loadingIndicator
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case links
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}
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enum Item: Hashable {
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case loadingIndicator
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case link(Card)
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case confirmLoadMore(Bool)
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static func ==(lhs: Item, rhs: Item) -> Bool {
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switch (lhs, rhs) {
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case (.loadingIndicator, .loadingIndicator):
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return true
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case (.link(let a), .link(let b)):
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return a.url == b.url
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case (.confirmLoadMore(let a), .confirmLoadMore(let b)):
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return a == b
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default:
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return false
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}
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}
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func hash(into hasher: inout Hasher) {
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switch self {
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case .loadingIndicator:
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hasher.combine(0)
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case .link(let card):
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hasher.combine(1)
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hasher.combine(card.url)
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case .confirmLoadMore(let loading):
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hasher.combine(2)
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hasher.combine(loading)
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}
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}
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var shouldSelect: Bool {
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if case .link(_) = self {
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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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}
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}
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extension TrendingLinksViewController: UICollectionViewDelegate {
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func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
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if indexPath.section == collectionView.numberOfSections - 1,
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indexPath.row == collectionView.numberOfItems(inSection: indexPath.section) - 1 {
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Task {
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await 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)?.shouldSelect ?? false
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}
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func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
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guard case .link(let card) = dataSource.itemIdentifier(for: indexPath),
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let url = URL(card.url) else {
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return
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}
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selected(url: url)
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}
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func collectionView(_ collectionView: UICollectionView, contextMenuConfigurationForItemAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration? {
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guard case .link(let card) = dataSource.itemIdentifier(for: indexPath),
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let url = URL(card.url),
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let cell = collectionView.cellForItem(at: indexPath) else {
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return nil
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}
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return UIContextMenuConfiguration {
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let vc = SFSafariViewController(url: url)
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vc.preferredControlTintColor = Preferences.shared.accentColor.color
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return vc
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} actionProvider: { _ in
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UIMenu(children: self.actionsForTrendingLink(card: card, source: .view(cell)))
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}
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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 TrendingLinksViewController: UICollectionViewDragDelegate {
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func collectionView(_ collectionView: UICollectionView, itemsForBeginning session: UIDragSession, at indexPath: IndexPath) -> [UIDragItem] {
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guard case .link(let card) = dataSource.itemIdentifier(for: indexPath),
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let url = URL(card.url) else {
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return []
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}
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return [UIDragItem(itemProvider: NSItemProvider(object: url as NSURL))]
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}
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}
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extension TrendingLinksViewController: TuskerNavigationDelegate {
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var apiController: MastodonController! { mastodonController }
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}
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extension TrendingLinksViewController: ToastableViewController {
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}
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extension TrendingLinksViewController: MenuActionProvider {
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}
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