2022-09-24 14:49:06 +00:00
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//
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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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2022-10-08 18:53:21 +00:00
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class TimelineViewController: UIViewController, TimelineLikeCollectionViewController, RefreshableViewController {
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2022-09-24 14:49:06 +00:00
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let timeline: Timeline
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weak var mastodonController: MastodonController!
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2022-09-24 15:32:50 +00:00
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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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2022-10-01 19:32:06 +00:00
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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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2022-10-08 18:53:21 +00:00
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addKeyCommand(MenuController.refreshCommand(discoverabilityTitle: "Refresh Timeline"))
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2022-09-24 14:49:06 +00:00
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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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2022-10-08 18:33:07 +00:00
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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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2022-10-03 01:34:06 +00:00
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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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2022-10-03 01:34:06 +00:00
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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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2022-10-01 19:08:51 +00:00
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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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2022-09-24 15:32:50 +00:00
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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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2022-10-03 01:34:06 +00:00
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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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2022-10-04 04:02:41 +00:00
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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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2022-09-24 14:49:06 +00:00
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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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2022-09-24 14:49:06 +00:00
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}
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override func viewWillAppear(_ animated: Bool) {
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super.viewWillAppear(animated)
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2022-10-06 02:28:10 +00:00
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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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2022-09-24 14:49:06 +00:00
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Task {
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await controller.loadInitial()
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}
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}
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2022-10-09 23:11:34 +00:00
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override func viewDidAppear(_ animated: Bool) {
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super.viewDidAppear(animated)
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if isShowingTimelineDescription,
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case .public(let local) = timeline {
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if local {
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Preferences.shared.hasShownLocalTimelineDescription = true
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} else {
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Preferences.shared.hasShownFederatedTimelineDescription = true
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}
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}
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}
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2022-10-09 21:06:10 +00:00
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override func viewDidDisappear(_ animated: Bool) {
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super.viewDidDisappear(animated)
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2022-10-10 00:11:00 +00:00
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pruneOffscreenRows()
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2022-10-09 21:06:10 +00:00
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}
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2022-10-01 19:32:06 +00:00
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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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2022-10-10 00:11:00 +00:00
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private func pruneOffscreenRows() {
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guard let lastVisibleIndexPath = collectionView.indexPathsForVisibleItems.last else {
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return
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}
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var snapshot = dataSource.snapshot()
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2022-10-10 20:21:08 +00:00
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guard snapshot.indexOfSection(.statuses) != nil else {
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return
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}
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2022-10-10 00:11:00 +00:00
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let items = snapshot.itemIdentifiers(inSection: .statuses)
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let pageSize = 20
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let numberOfPagesToPrune = (items.count - lastVisibleIndexPath.row - 1) / pageSize
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if numberOfPagesToPrune > 0 {
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let itemsToRemove = Array(items.suffix(numberOfPagesToPrune * pageSize))
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snapshot.deleteItems(itemsToRemove)
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}
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dataSource.apply(snapshot, animatingDifferences: false)
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if case .status(id: let id, state: _) = snapshot.itemIdentifiers(inSection: .statuses).last {
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older = .before(id: id, count: nil)
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}
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}
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2022-10-08 18:53:21 +00:00
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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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2022-10-06 02:28:10 +00:00
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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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2022-09-24 14:49:06 +00:00
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}
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}
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2022-10-01 19:08:51 +00:00
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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)
|
|
|
|
let (statuses, _) = try await mastodonController.run(request)
|
|
|
|
|
|
|
|
if !statuses.isEmpty {
|
|
|
|
self.older = .before(id: statuses.last!.id, count: nil)
|
|
|
|
}
|
|
|
|
|
|
|
|
return await withCheckedContinuation { continuation in
|
|
|
|
mastodonController.persistentContainer.addAll(statuses: statuses) {
|
|
|
|
continuation.resume(returning: statuses.map(\.id))
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2022-09-24 15:32:50 +00:00
|
|
|
enum Error: TimelineLikeCollectionViewError {
|
2022-09-24 14:49:06 +00:00
|
|
|
case noClient
|
|
|
|
case noNewer
|
|
|
|
case noOlder
|
|
|
|
case allCaughtUp
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
extension TimelineViewController: UICollectionViewDelegate {
|
|
|
|
func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
|
|
|
|
guard case .statuses = dataSource.sectionIdentifier(for: indexPath.section),
|
|
|
|
case .status(_, _) = dataSource.itemIdentifier(for: indexPath) else {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
let itemsInSection = collectionView.numberOfItems(inSection: indexPath.section)
|
|
|
|
if indexPath.row == itemsInSection - 1 {
|
|
|
|
Task {
|
|
|
|
await controller.loadOlder()
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2022-10-01 19:32:06 +00:00
|
|
|
|
2022-10-06 02:28:10 +00:00
|
|
|
func collectionView(_ collectionView: UICollectionView, shouldSelectItemAt indexPath: IndexPath) -> Bool {
|
|
|
|
return dataSource.itemIdentifier(for: indexPath)?.isSelectable ?? false
|
|
|
|
}
|
|
|
|
|
2022-10-01 19:32:06 +00:00
|
|
|
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
|
|
|
|
guard let item = dataSource.itemIdentifier(for: indexPath) else {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
switch item {
|
|
|
|
case .publicTimelineDescription:
|
|
|
|
removeTimelineDescriptionCell()
|
2022-10-06 02:28:10 +00:00
|
|
|
case .status(id: let id, state: let state):
|
2022-10-10 18:23:22 +00:00
|
|
|
let status = mastodonController.persistentContainer.status(for: id)!
|
|
|
|
// if the status in the timeline is a reblog, show the status that it is a reblog of
|
|
|
|
selected(status: status.reblog?.id ?? id, state: state.copy())
|
2022-10-06 02:28:10 +00:00
|
|
|
case .loadingIndicator, .confirmLoadMore:
|
|
|
|
fatalError("unreachable")
|
2022-10-01 19:32:06 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2022-10-08 23:16:10 +00:00
|
|
|
func collectionView(_ collectionView: UICollectionView, contextMenuConfigurationForItemAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration? {
|
|
|
|
return (collectionView.cellForItem(at: indexPath) as? TimelineStatusCollectionViewCell)?.contextMenuConfiguration()
|
|
|
|
}
|
|
|
|
|
|
|
|
func collectionView(_ collectionView: UICollectionView, willPerformPreviewActionForMenuWith configuration: UIContextMenuConfiguration, animator: UIContextMenuInteractionCommitAnimating) {
|
|
|
|
MenuPreviewHelper.willPerformPreviewAction(animator: animator, presenter: self)
|
|
|
|
}
|
|
|
|
|
2022-10-01 19:32:06 +00:00
|
|
|
func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
|
|
|
|
if isShowingTimelineDescription {
|
|
|
|
removeTimelineDescriptionCell()
|
|
|
|
}
|
|
|
|
}
|
2022-09-24 14:49:06 +00:00
|
|
|
}
|
2022-10-04 04:02:41 +00:00
|
|
|
|
2022-10-08 18:59:50 +00:00
|
|
|
extension TimelineViewController: UICollectionViewDragDelegate {
|
|
|
|
func collectionView(_ collectionView: UICollectionView, itemsForBeginning session: UIDragSession, at indexPath: IndexPath) -> [UIDragItem] {
|
|
|
|
(collectionView.cellForItem(at: indexPath) as? TimelineStatusCollectionViewCell)?.dragItemsForBeginning(session: session) ?? []
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2022-10-05 21:40:00 +00:00
|
|
|
extension TimelineViewController: TuskerNavigationDelegate {
|
|
|
|
var apiController: MastodonController { mastodonController }
|
|
|
|
}
|
|
|
|
|
|
|
|
extension TimelineViewController: MenuActionProvider {
|
|
|
|
}
|
|
|
|
|
2022-10-06 03:12:03 +00:00
|
|
|
extension TimelineViewController: StatusCollectionViewCellDelegate {
|
2022-10-08 19:31:08 +00:00
|
|
|
func statusCellNeedsReconfigure(_ cell: StatusCollectionViewCell, animated: Bool, completion: (() -> Void)?) {
|
2022-10-05 21:40:00 +00:00
|
|
|
if let indexPath = collectionView.indexPath(for: cell) {
|
|
|
|
var snapshot = dataSource.snapshot()
|
|
|
|
snapshot.reconfigureItems([dataSource.itemIdentifier(for: indexPath)!])
|
2022-10-08 19:31:08 +00:00
|
|
|
dataSource.apply(snapshot, animatingDifferences: animated, completion: completion)
|
2022-10-05 21:40:00 +00:00
|
|
|
}
|
2022-10-04 04:02:41 +00:00
|
|
|
}
|
|
|
|
}
|