metatext-app-ios-iphone-ipad/View Controllers/TableViewController.swift

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Swift
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// Copyright © 2020 Metabolist. All rights reserved.
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import AVKit
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import Combine
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import Kingfisher
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import Mastodon
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import SafariServices
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import SwiftUI
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import ViewModels
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// swiftlint:disable file_length
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class TableViewController: UITableViewController {
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var transitionViewTag = -1
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private let viewModel: CollectionViewModel
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private let rootViewModel: RootViewModel
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private let loadingTableFooterView = LoadingTableFooterView()
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private let webfingerIndicatorView = WebfingerIndicatorView()
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@Published private var loading = false
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private var visibleLoadMoreViews = Set<LoadMoreView>()
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private var cancellables = Set<AnyCancellable>()
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private var cellHeightCaches = [CGFloat: [CollectionItem: CGFloat]]()
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private var shouldKeepPlayingVideoAfterDismissal = false
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private let insetBottom: Bool
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private weak var parentNavigationController: UINavigationController?
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private lazy var dataSource: TableViewDataSource = {
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.init(tableView: tableView, viewModel: viewModel)
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}()
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init(viewModel: CollectionViewModel,
rootViewModel: RootViewModel,
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insetBottom: Bool = true,
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parentNavigationController: UINavigationController? = nil) {
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self.viewModel = viewModel
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self.rootViewModel = rootViewModel
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self.insetBottom = insetBottom
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self.parentNavigationController = parentNavigationController
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super.init(style: .plain)
}
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@available(*, unavailable)
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required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
tableView.dataSource = dataSource
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tableView.prefetchDataSource = self
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tableView.cellLayoutMarginsFollowReadableWidth = true
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tableView.tableFooterView = UIView()
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tableView.contentInset.bottom = bottomInset
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tableView.isAccessibilityElement = false
tableView.shouldGroupAccessibilityChildren = true
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if viewModel.canRefresh {
refreshControl = UIRefreshControl()
refreshControl?.addAction(
UIAction { [weak self] _ in
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self?.refreshIfAble() },
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for: .valueChanged)
}
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view.addSubview(webfingerIndicatorView)
webfingerIndicatorView.translatesAutoresizingMaskIntoConstraints = false
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NSLayoutConstraint.activate([
webfingerIndicatorView.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor),
webfingerIndicatorView.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor)
])
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setupViewModelBindings()
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viewModel.request(maxId: nil, minId: nil, search: nil)
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}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
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refreshIfAble()
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}
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override func scrollViewDidScroll(_ scrollView: UIScrollView) {
guard scrollView.isDragging else { return }
let up = scrollView.panGestureRecognizer.translation(in: scrollView.superview).y > 0
for loadMoreView in visibleLoadMoreViews {
loadMoreView.directionChanged(up: up)
}
}
override func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
for loadMoreView in visibleLoadMoreViews {
loadMoreView.finalizeDirectionChange()
}
}
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override func tableView(_ tableView: UITableView,
willDisplay cell: UITableViewCell,
forRowAt indexPath: IndexPath) {
guard let item = dataSource.itemIdentifier(for: indexPath) else { return }
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var heightCache = cellHeightCaches[tableView.frame.width] ?? [CollectionItem: CGFloat]()
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heightCache[item] = cell.frame.height
cellHeightCaches[tableView.frame.width] = heightCache
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if !loading,
indexPath.section == dataSource.numberOfSections(in: tableView) - 1,
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indexPath.row == dataSource.tableView(tableView, numberOfRowsInSection: indexPath.section) - 1 {
viewModel.requestNextPage(fromIndexPath: indexPath)
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}
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if let loadMoreView = cell.contentView as? LoadMoreView {
visibleLoadMoreViews.insert(loadMoreView)
}
}
override func tableView(_ tableView: UITableView,
didEndDisplaying cell: UITableViewCell,
forRowAt indexPath: IndexPath) {
if let loadMoreView = cell.contentView as? LoadMoreView {
visibleLoadMoreViews.remove(loadMoreView)
}
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}
override func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
guard let item = dataSource.itemIdentifier(for: indexPath) else { return UITableView.automaticDimension }
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return cellHeightCaches[tableView.frame.width]?[item]
?? item.estimatedHeight(width: tableView.readableContentGuide.layoutFrame.width,
identityContext: viewModel.identityContext)
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}
override func tableView(_ tableView: UITableView, shouldHighlightRowAt indexPath: IndexPath) -> Bool {
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if case .loadMore = dataSource.itemIdentifier(for: indexPath), UIAccessibility.isVoiceOverRunning {
return false
}
return viewModel.canSelect(indexPath: indexPath)
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}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
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tableView.deselectRow(at: indexPath, animated: true)
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viewModel.select(indexPath: indexPath)
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}
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override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
sizeTableHeaderFooterViews()
}
}
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extension TableViewController {
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func report(reportViewModel: ReportViewModel) {
let reportViewController = ReportViewController(viewModel: reportViewModel)
let navigationController = UINavigationController(rootViewController: reportViewController)
present(navigationController, animated: true)
}
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func sizeTableHeaderFooterViews() {
// https://useyourloaf.com/blog/variable-height-table-view-header/
if let headerView = tableView.tableHeaderView {
let size = headerView.systemLayoutSizeFitting(
CGSize(width: tableView.frame.width, height: .greatestFiniteMagnitude),
withHorizontalFittingPriority: .required,
verticalFittingPriority: .fittingSizeLevel)
if headerView.frame.size.height != size.height {
headerView.frame.size.height = size.height
tableView.tableHeaderView = headerView
tableView.layoutIfNeeded()
}
view.insertSubview(webfingerIndicatorView, aboveSubview: headerView)
}
if let footerView = tableView.tableFooterView {
let size = footerView.systemLayoutSizeFitting(
CGSize(width: tableView.frame.width, height: .greatestFiniteMagnitude),
withHorizontalFittingPriority: .required,
verticalFittingPriority: .fittingSizeLevel)
if footerView.frame.size.height != size.height {
footerView.frame.size.height = size.height
tableView.tableFooterView = footerView
tableView.layoutIfNeeded()
}
}
}
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func handle(navigation: Navigation) {
switch navigation {
case let .collection(collectionService):
let vc = TableViewController(
viewModel: CollectionItemsViewModel(
collectionService: collectionService,
identityContext: viewModel.identityContext),
rootViewModel: rootViewModel,
parentNavigationController: parentNavigationController)
if let parentNavigationController = parentNavigationController {
parentNavigationController.pushViewController(vc, animated: true)
} else {
show(vc, sender: self)
}
case let .profile(profileService):
let vc = ProfileViewController(
viewModel: ProfileViewModel(
profileService: profileService,
identityContext: viewModel.identityContext),
rootViewModel: rootViewModel,
identityContext: viewModel.identityContext,
parentNavigationController: parentNavigationController)
if let parentNavigationController = parentNavigationController {
parentNavigationController.pushViewController(vc, animated: true)
} else {
show(vc, sender: self)
}
case let .notification(notificationService):
navigate(toNotification: notificationService.notification)
case let .url(url):
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open(url: url)
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case .searchScope:
break
case .webfingerStart:
webfingerIndicatorView.startAnimating()
case .webfingerEnd:
webfingerIndicatorView.stopAnimating()
}
}
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}
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extension TableViewController: UITableViewDataSourcePrefetching {
func tableView(_ tableView: UITableView, prefetchRowsAt indexPaths: [IndexPath]) {
let urls = indexPaths.compactMap(dataSource.itemIdentifier(for:))
.reduce(Set<URL>()) { $0.union($1.mediaPrefetchURLs(identityContext: viewModel.identityContext)) }
var imageOptions = KingfisherManager.shared.defaultOptions
imageOptions.append(.requestModifier(PrefetchRequestModifier()))
for url in urls {
KingfisherManager.shared.retrieveImage(with: url, completionHandler: nil)
}
}
}
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extension TableViewController: AVPlayerViewControllerDelegate {
func playerViewController(
_ playerViewController: AVPlayerViewController,
willEndFullScreenPresentationWithAnimationCoordinator coordinator: UIViewControllerTransitionCoordinator) {
try? AVAudioSession.sharedInstance().setCategory(.ambient, mode: .default)
playerViewController.player?.isMuted = true
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coordinator.animate(alongsideTransition: nil) { _ in
if self.shouldKeepPlayingVideoAfterDismissal {
playerViewController.player?.play()
}
}
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}
}
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extension TableViewController: ZoomAnimatorDelegate {
func transitionWillStartWith(zoomAnimator: ZoomAnimator) {
view.layoutIfNeeded()
guard let imageViewController = (presentedViewController as? ImageNavigationController)?.currentViewController
else { return }
if imageViewController.playerView.tag != 0 {
transitionViewTag = imageViewController.playerView.tag
} else if imageViewController.imageView.tag != 0 {
transitionViewTag = imageViewController.imageView.tag
}
}
func transitionDidEndWith(zoomAnimator: ZoomAnimator) {
}
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func referenceView(for zoomAnimator: ZoomAnimator) -> UIView? {
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view.viewWithTag(transitionViewTag)
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}
func referenceViewFrameInTransitioningView(for zoomAnimator: ZoomAnimator) -> CGRect? {
guard let referenceView = referenceView(for: zoomAnimator) else { return nil }
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return parent?.view.convert(referenceView.frame, from: referenceView.superview)
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}
}
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extension TableViewController: ScrollableToTop {
func scrollToTop(animated: Bool) {
tableView.scrollToTop(animated: animated)
}
}
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private extension TableViewController {
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static let bottomInset: CGFloat = .newStatusButtonDimension + .defaultSpacing * 4
static let loadingFooterDebounceInterval: TimeInterval = 0.75
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var bottomInset: CGFloat { insetBottom ? Self.bottomInset : 0 }
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// swiftlint:disable:next function_body_length
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func setupViewModelBindings() {
viewModel.title.sink { [weak self] in self?.navigationItem.title = $0 }.store(in: &cancellables)
viewModel.titleLocalizationComponents.receive(on: DispatchQueue.main).sink { [weak self] in
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guard let key = $0.first else { return }
self?.navigationItem.title = String(
format: NSLocalizedString(key, comment: ""),
arguments: Array($0.suffix(from: 1)))
}
.store(in: &cancellables)
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viewModel.updates.receive(on: DispatchQueue.main)
.sink { [weak self] in self?.update($0) }
.store(in: &cancellables)
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viewModel.events.receive(on: DispatchQueue.main)
.sink { [weak self] in self?.handle(event: $0) }
.store(in: &cancellables)
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viewModel.expandAll.receive(on: DispatchQueue.main)
.sink { [weak self] in self?.set(expandAllState: $0) }
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.store(in: &cancellables)
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viewModel.loading.receive(on: DispatchQueue.main).assign(to: &$loading)
$loading.combineLatest(
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$loading.debounce(
for: .seconds(Self.loadingFooterDebounceInterval),
scheduler: DispatchQueue.main))
.sink { [weak self] loading, debouncedLoading in
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guard let self = self else { return }
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let refreshControlVisibile = self.refreshControl?.isRefreshing ?? false
if !loading, refreshControlVisibile {
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self.refreshControl?.endRefreshing()
}
self.tableView.tableFooterView =
loading && debouncedLoading && !refreshControlVisibile ? self.loadingTableFooterView : UIView()
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self.sizeTableHeaderFooterViews()
}
.store(in: &cancellables)
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viewModel.alertItems
.compactMap { $0 }
.sink { [weak self] in self?.present(alertItem: $0) }
.store(in: &cancellables)
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tableView.publisher(for: \.contentOffset)
.compactMap { [weak self] _ in self?.tableView.indexPathsForVisibleRows?.first }
.sink { [weak self] in self?.viewModel.viewedAtTop(indexPath: $0) }
.store(in: &cancellables)
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NotificationCenter.default.publisher(for: UIScene.willEnterForegroundNotification)
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.merge(with: NotificationCenter.default.publisher(for: NewStatusViewController.newStatusPostedNotification))
.sink { [weak self] _ in self?.refreshIfAble() }
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.store(in: &cancellables)
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}
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func update(_ update: CollectionUpdate) {
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let positionMaintenanceOffset: CGFloat
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let preUpdateContentOffsetY = tableView.contentOffset.y
var setPreviousOffset = false
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if let itemId = update.maintainScrollPositionItemId,
let indexPath = dataSource.indexPath(itemId: itemId) {
positionMaintenanceOffset = tableView.rectForRow(at: indexPath).origin.y
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- tableView.safeAreaInsets.top - preUpdateContentOffsetY
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} else {
positionMaintenanceOffset = 0
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}
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if let headerView = tableView.tableHeaderView,
let headerViewWindowFrame = view.window?.convert(headerView.frame, from: headerView),
headerViewWindowFrame.maxY > 0 {
setPreviousOffset = true
}
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self.dataSource.apply(update.sections.snapshot(), animatingDifferences: false) { [weak self] in
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guard let self = self else { return }
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if let itemId = update.maintainScrollPositionItemId,
let indexPath = self.dataSource.indexPath(itemId: itemId),
!self.tableView.isDragging,
!self.tableView.isDecelerating {
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if update.shouldAdjustContentInset {
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self.tableView.contentInset.bottom = max(
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self.tableView.safeAreaLayoutGuide.layoutFrame.height
- self.tableView.rectForRow(at: indexPath).height,
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self.bottomInset)
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}
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self.tableView.scrollToRow(at: indexPath, at: .top, animated: false)
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self.tableView.contentOffset.y -= positionMaintenanceOffset
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} else if setPreviousOffset {
self.tableView.contentOffset.y = preUpdateContentOffsetY
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}
}
}
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func handle(event: CollectionItemEvent) {
switch event {
case .ignorableOutput:
break
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case .refresh:
refreshIfAble()
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case let .share(url):
share(url: url)
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case let .navigation(navigation):
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handle(navigation: navigation)
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case let .attachment(attachmentViewModel, statusViewModel):
present(attachmentViewModel: attachmentViewModel, statusViewModel: statusViewModel)
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case let .compose(inReplyToViewModel, redraft):
compose(inReplyToViewModel: inReplyToViewModel, redraft: redraft)
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case let .confirmDelete(statusViewModel, redraft):
confirmDelete(statusViewModel: statusViewModel, redraft: redraft)
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case let .report(reportViewModel):
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report(reportViewModel: reportViewModel)
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case let .accountListEdit(accountViewModel, edit):
accountListEdit(accountViewModel: accountViewModel, edit: edit)
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}
}
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func navigate(toNotification: MastodonNotification) {
guard let item = dataSource.snapshot().itemIdentifiers.first(where: {
guard case let .notification(notification, _) = $0 else { return false }
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return notification.id == toNotification.id
}),
let indexPath = dataSource.indexPath(for: item)
else { return }
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tableView.scrollToRow(at: indexPath, at: .none, animated: !UIAccessibility.isReduceMotionEnabled)
viewModel.select(indexPath: indexPath)
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}
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func open(url: URL) {
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func openWithRegardToBrowserSetting(url: URL) {
if viewModel.identityContext.appPreferences.openLinksInDefaultBrowser {
UIApplication.shared.open(url)
} else {
present(SFSafariViewController(url: url), animated: true)
}
}
if viewModel.identityContext.appPreferences.useUniversalLinks {
UIApplication.shared.open(url, options: [.universalLinksOnly: true]) { success in
if !success {
openWithRegardToBrowserSetting(url: url)
}
}
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} else {
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openWithRegardToBrowserSetting(url: url)
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}
}
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func present(attachmentViewModel: AttachmentViewModel, statusViewModel: StatusViewModel) {
switch attachmentViewModel.attachment.type {
case .audio, .video:
let playerViewController = AVPlayerViewController()
let player: AVPlayer
if attachmentViewModel.attachment.type == .video {
player = PlayerCache.shared.player(url: attachmentViewModel.attachment.url)
} else {
player = AVPlayer(url: attachmentViewModel.attachment.url)
}
playerViewController.delegate = self
playerViewController.player = player
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shouldKeepPlayingVideoAfterDismissal = attachmentViewModel.shouldAutoplay
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present(playerViewController, animated: true) {
try? AVAudioSession.sharedInstance().setCategory(.playback, mode: .default)
player.isMuted = false
player.play()
}
case .image, .gifv:
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let imagePageViewController = ImagePageViewController(
initiallyVisible: attachmentViewModel,
statusViewModel: statusViewModel)
let imageNavigationController = ImageNavigationController(imagePageViewController: imagePageViewController)
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imageNavigationController.transitionController.fromDelegate = self
transitionViewTag = attachmentViewModel.tag
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present(imageNavigationController, animated: true)
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case .unknown:
break
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}
}
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func compose(inReplyToViewModel: StatusViewModel?, redraft: Status?) {
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rootViewModel.navigationViewModel?.presentedNewStatusViewModel = rootViewModel.newStatusViewModel(
identityContext: viewModel.identityContext,
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inReplyTo: inReplyToViewModel,
redraft: redraft)
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}
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func confirmDelete(statusViewModel: StatusViewModel, redraft: Bool) {
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let deleteAndRedraftConfirmMessage: String
let deleteConfirmMessage: String
switch viewModel.identityContext.appPreferences.statusWord {
case .toot:
deleteAndRedraftConfirmMessage = NSLocalizedString("status.delete-and-redraft.confirm.toot", comment: "")
deleteConfirmMessage = NSLocalizedString("status.delete.confirm.toot", comment: "")
case .post:
deleteAndRedraftConfirmMessage = NSLocalizedString("status.delete-and-redraft.confirm.post", comment: "")
deleteConfirmMessage = NSLocalizedString("status.delete.confirm.post", comment: "")
}
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let alertController = UIAlertController(
title: nil,
message: redraft
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? deleteAndRedraftConfirmMessage
: deleteConfirmMessage,
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preferredStyle: .alert)
let deleteAction = UIAlertAction(
title: redraft
? NSLocalizedString("status.delete-and-redraft", comment: "")
: NSLocalizedString("status.delete", comment: ""),
style: .destructive) { _ in
redraft ? statusViewModel.deleteAndRedraft() : statusViewModel.delete()
}
let cancelAction = UIAlertAction(title: NSLocalizedString("cancel", comment: ""), style: .cancel) { _ in }
alertController.addAction(deleteAction)
alertController.addAction(cancelAction)
present(alertController, animated: true)
}
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func accountListEdit(accountViewModel: AccountViewModel, edit: CollectionItemEvent.AccountListEdit) {
viewModel.applyAccountListEdit(viewModel: accountViewModel, edit: edit)
}
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func set(expandAllState: ExpandAllState) {
switch expandAllState {
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case .hidden:
navigationItem.rightBarButtonItem = nil
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case .expand:
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navigationItem.rightBarButtonItem = UIBarButtonItem(
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title: NSLocalizedString("status.show-more-all-button.accessibilty-label", comment: ""),
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image: UIImage(systemName: "eye"),
primaryAction: UIAction { [weak self] _ in self?.viewModel.toggleExpandAll() })
case .collapse:
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navigationItem.rightBarButtonItem = UIBarButtonItem(
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title: NSLocalizedString("status.show-less-all-button.accessibilty-label", comment: ""),
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image: UIImage(systemName: "eye.slash"),
primaryAction: UIAction { [weak self] _ in self?.viewModel.toggleExpandAll() })
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}
}
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func share(url: URL) {
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let activityViewController = UIActivityViewController(
activityItems: [url],
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applicationActivities: [OpenInDefaultBrowserActivity()])
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if UIDevice.current.userInterfaceIdiom == .pad {
guard let sourceView = tableView.viewWithTag(url.hashValue) else { return }
activityViewController.popoverPresentationController?.sourceView = sourceView
}
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present(activityViewController, animated: true, completion: nil)
}
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func refreshIfAble() {
if viewModel.canRefresh {
viewModel.request(maxId: nil, minId: nil, search: nil)
}
}
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}
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// swiftlint:enable file_length