220 lines
8.1 KiB
Swift
220 lines
8.1 KiB
Swift
//
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// StatusEditHistoryViewController.swift
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// Tusker
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//
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// Created by Shadowfacts on 5/11/23.
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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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class StatusEditHistoryViewController: UIViewController, CollectionViewController {
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private let statusID: String
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private let mastodonController: MastodonController
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private var state = State.unloaded
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private(set) var collectionView: UICollectionView!
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private var dataSource: UICollectionViewDiffableDataSource<Section, Item>!
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init(statusID: String, mastodonController: MastodonController) {
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self.statusID = statusID
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self.mastodonController = mastodonController
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super.init(nibName: nil, bundle: nil)
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title = "Edit History"
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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: .grouped)
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config.backgroundColor = .appGroupedBackground
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config.itemSeparatorHandler = { [unowned self] indexPath, sectionConfig in
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guard let item = self.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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}
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return config
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}
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if let status = mastodonController.persistentContainer.status(for: statusID),
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status.url?.host != mastodonController.instanceURL.host {
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config.footerMode = .supplementary
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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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collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
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collectionView.delegate = self
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collectionView.translatesAutoresizingMaskIntoConstraints = false
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view.addSubview(collectionView)
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NSLayoutConstraint.activate([
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collectionView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
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collectionView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
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collectionView.topAnchor.constraint(equalTo: view.topAnchor),
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collectionView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
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])
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dataSource = createDataSource()
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}
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private func createDataSource() -> UICollectionViewDiffableDataSource<Section, Item> {
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let editCell = UICollectionView.CellRegistration<StatusEditCollectionViewCell, (StatusEdit, CollapseState, Int)> { [unowned self] cell, indexPath, itemIdentifier in
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cell.delegate = self
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cell.updateUI(edit: itemIdentifier.0, state: itemIdentifier.1, index: itemIdentifier.2)
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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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let dataSource = UICollectionViewDiffableDataSource<Section, Item>(collectionView: collectionView) { collectionView, indexPath, itemIdentifier in
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switch itemIdentifier {
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case .edit(let edit, let state, index: let index):
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return collectionView.dequeueConfiguredReusableCell(using: editCell, for: indexPath, item: (edit, state, index))
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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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let footerCell = UICollectionView.SupplementaryRegistration<UICollectionViewListCell>(elementKind: UICollectionView.elementKindSectionFooter) { supplementaryView, elementKind, indexPath in
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var config = supplementaryView.defaultContentConfiguration()
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config.text = "Edit history for posts originating from instances other than your own may not be complete."
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supplementaryView.contentConfiguration = config
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}
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dataSource.supplementaryViewProvider = { collectionView, elementKind, indexPath in
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return collectionView.dequeueConfiguredReusableSupplementary(using: footerCell, for: indexPath)
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}
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return dataSource
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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 load()
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}
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}
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}
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private func load() 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([.edits])
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snapshot.appendItems([.loadingIndicator])
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await apply(snapshot)
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let req = Status.history(statusID)
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do {
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let (edits, _) = try await mastodonController.run(req)
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var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
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snapshot.appendSections([.edits])
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// show them in reverse chronological order
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snapshot.appendItems(edits.reversed().enumerated().map {
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.edit($1, .unknown, index: $0)
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})
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await apply(snapshot)
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state = .loaded
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} catch {
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state = .unloaded
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let config = ToastConfiguration(from: error, with: "Error Loading Edits", in: self) { [weak self] toast in
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toast.dismissToast(animated: true)
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await self?.load()
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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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private func apply(_ snapshot: NSDiffableDataSourceSnapshot<Section, Item>) async {
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await MainActor.run {
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self.dataSource.apply(snapshot)
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}
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}
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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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}
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}
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extension StatusEditHistoryViewController {
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enum Section {
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case edits
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}
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enum Item: Hashable, Equatable {
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case edit(StatusEdit, CollapseState, index: Int)
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case loadingIndicator
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static func ==(lhs: Item, rhs: Item) -> Bool {
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switch (lhs, rhs) {
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case (.edit(_, _, let a), .edit(_, _, 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 .edit(_, _, index: let index):
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hasher.combine(0)
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hasher.combine(index)
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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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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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}
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}
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extension StatusEditHistoryViewController: UICollectionViewDelegate {
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func collectionView(_ collectionView: UICollectionView, shouldSelectItemAt indexPath: IndexPath) -> Bool {
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return false
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}
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}
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extension StatusEditHistoryViewController: TuskerNavigationDelegate {
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nonisolated var apiController: MastodonController! { mastodonController }
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}
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extension StatusEditHistoryViewController: StatusEditCollectionViewCellDelegate {
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func statusEditCellNeedsReconfigure(_ cell: StatusEditCollectionViewCell, 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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}
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