mirror of
https://github.com/metabolist/metatext.git
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394 lines
15 KiB
Swift
394 lines
15 KiB
Swift
// Copyright © 2020 Metabolist. All rights reserved.
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import AVKit
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import Combine
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import SafariServices
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import SwiftUI
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import ViewModels
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class TableViewController: UITableViewController {
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private let viewModel: CollectionViewModel
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private let identification: Identification
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private let loadingTableFooterView = LoadingTableFooterView()
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private let webfingerIndicatorView = WebfingerIndicatorView()
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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 transitionViewTag = -1
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private lazy var dataSource: TableViewDataSource = {
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.init(tableView: tableView, viewModelProvider: viewModel.viewModel(indexPath:))
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}()
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init(viewModel: CollectionViewModel, identification: Identification) {
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self.viewModel = viewModel
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self.identification = identification
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super.init(style: .plain)
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}
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@available(*, unavailable)
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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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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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view.addSubview(webfingerIndicatorView)
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webfingerIndicatorView.translatesAutoresizingMaskIntoConstraints = false
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NSLayoutConstraint.activate([
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webfingerIndicatorView.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor),
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webfingerIndicatorView.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor)
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])
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setupViewModelBindings()
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}
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override func viewWillAppear(_ animated: Bool) {
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super.viewWillAppear(animated)
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viewModel.request(maxId: nil, minId: nil)
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}
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override func viewDidAppear(_ animated: Bool) {
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super.viewDidAppear(animated)
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updateAutoplayViews()
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}
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override func viewDidDisappear(_ animated: Bool) {
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super.viewDidDisappear(animated)
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updateAutoplayViews()
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}
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override func scrollViewDidScroll(_ scrollView: UIScrollView) {
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guard scrollView.isDragging else { return }
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let up = scrollView.panGestureRecognizer.translation(in: scrollView.superview).y > 0
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for loadMoreView in visibleLoadMoreViews {
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loadMoreView.directionChanged(up: up)
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}
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updateAutoplayViews()
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}
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override func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
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for loadMoreView in visibleLoadMoreViews {
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loadMoreView.finalizeDirectionChange()
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}
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}
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override func tableView(_ tableView: UITableView,
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willDisplay cell: UITableViewCell,
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forRowAt indexPath: IndexPath) {
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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
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cellHeightCaches[tableView.frame.width] = heightCache
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}
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override func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
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guard let item = dataSource.itemIdentifier(for: indexPath) else { return UITableView.automaticDimension }
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return cellHeightCaches[tableView.frame.width]?[item] ?? UITableView.automaticDimension
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}
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override func tableView(_ tableView: UITableView, shouldHighlightRowAt indexPath: IndexPath) -> Bool {
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viewModel.canSelect(indexPath: indexPath)
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}
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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() {
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super.viewDidLayoutSubviews()
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sizeTableHeaderFooterViews()
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}
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}
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extension TableViewController {
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static let autoplayableAttachmentsView = PassthroughSubject<StatusAttachmentsView?, Never>()
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static let autoplayableAttachmentsViewNotification =
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Notification.Name("com.metabolist.metatext.attachment-view-became-autoplayable")
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}
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extension TableViewController: UITableViewDataSourcePrefetching {
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func tableView(_ tableView: UITableView, prefetchRowsAt indexPaths: [IndexPath]) {
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guard
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let maxId = viewModel.nextPageMaxId,
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let indexPath = indexPaths.last,
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indexPath.section == dataSource.numberOfSections(in: tableView) - 1,
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indexPath.row == dataSource.tableView(tableView, numberOfRowsInSection: indexPath.section) - 1
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else { return }
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viewModel.request(maxId: maxId, minId: nil)
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}
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}
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extension TableViewController {
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func sizeTableHeaderFooterViews() {
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// https://useyourloaf.com/blog/variable-height-table-view-header/
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if let headerView = tableView.tableHeaderView {
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let size = headerView.systemLayoutSizeFitting(
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CGSize(width: tableView.frame.width, height: .greatestFiniteMagnitude),
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withHorizontalFittingPriority: .required,
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verticalFittingPriority: .fittingSizeLevel)
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if headerView.frame.size.height != size.height {
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headerView.frame.size.height = size.height
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tableView.tableHeaderView = headerView
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tableView.layoutIfNeeded()
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}
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view.insertSubview(webfingerIndicatorView, aboveSubview: headerView)
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}
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if let footerView = tableView.tableFooterView {
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let size = footerView.systemLayoutSizeFitting(
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CGSize(width: tableView.frame.width, height: .greatestFiniteMagnitude),
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withHorizontalFittingPriority: .required,
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verticalFittingPriority: .fittingSizeLevel)
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if footerView.frame.size.height != size.height {
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footerView.frame.size.height = size.height
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tableView.tableFooterView = footerView
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tableView.layoutIfNeeded()
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}
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}
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}
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}
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extension TableViewController: AVPlayerViewControllerDelegate {
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func playerViewController(
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_ playerViewController: AVPlayerViewController,
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willEndFullScreenPresentationWithAnimationCoordinator coordinator: UIViewControllerTransitionCoordinator) {
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try? AVAudioSession.sharedInstance().setCategory(.ambient, mode: .default)
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playerViewController.player?.isMuted = true
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updateAutoplayViews()
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}
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}
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extension TableViewController: ZoomAnimatorDelegate {
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func transitionWillStartWith(zoomAnimator: ZoomAnimator) {
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view.layoutIfNeeded()
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guard let imageViewController = (presentedViewController as? ImageNavigationController)?.currentViewController
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else { return }
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if imageViewController.playerView.tag != 0 {
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transitionViewTag = imageViewController.playerView.tag
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} else if imageViewController.imageView.tag != 0 {
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transitionViewTag = imageViewController.imageView.tag
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}
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}
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func transitionDidEndWith(zoomAnimator: ZoomAnimator) {
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}
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func referenceView(for zoomAnimator: ZoomAnimator) -> UIView? {
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tableView.visibleCells.compactMap { $0.viewWithTag(transitionViewTag) }.first
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}
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func referenceViewFrameInTransitioningView(for zoomAnimator: ZoomAnimator) -> CGRect? {
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guard let referenceView = referenceView(for: zoomAnimator) else { return nil }
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return tabBarController?.view.convert(referenceView.frame, from: referenceView.superview)
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}
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}
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private extension TableViewController {
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var visibleLoadMoreViews: [LoadMoreView] {
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tableView.visibleCells.compactMap { $0.contentView as? LoadMoreView }
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}
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func setupViewModelBindings() {
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viewModel.title.sink { [weak self] in self?.navigationItem.title = $0 }.store(in: &cancellables)
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viewModel.updates.sink { [weak self] in self?.update($0) }.store(in: &cancellables)
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viewModel.events.receive(on: DispatchQueue.main)
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.sink { [weak self] in self?.handle(event: $0) }
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.store(in: &cancellables)
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viewModel.expandAll.receive(on: DispatchQueue.main)
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.sink { [weak self] in self?.set(expandAllState: $0) }
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.store(in: &cancellables)
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viewModel.loading.receive(on: RunLoop.main).sink { [weak self] in
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guard let self = self else { return }
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self.tableView.tableFooterView = $0 ? self.loadingTableFooterView : UIView()
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self.sizeTableHeaderFooterViews()
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}
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.store(in: &cancellables)
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tableView.publisher(for: \.contentOffset)
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.compactMap { [weak self] _ in self?.tableView.indexPathsForVisibleRows?.first }
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.sink { [weak self] in self?.viewModel.viewedAtTop(indexPath: $0) }
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.store(in: &cancellables)
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Self.autoplayableAttachmentsView
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.removeDuplicates()
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.sink {
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let notification = Notification(
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name: Self.autoplayableAttachmentsViewNotification,
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object: $0,
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userInfo: nil)
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NotificationCenter.default.post(notification)
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}
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.store(in: &cancellables)
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}
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func update(_ update: CollectionUpdate) {
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var offsetFromNavigationBar: CGFloat?
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if
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let item = update.maintainScrollPosition,
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let indexPath = dataSource.indexPath(for: item),
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let navigationBar = navigationController?.navigationBar {
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let navigationBarMaxY = tableView.convert(navigationBar.bounds, from: navigationBar).maxY
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offsetFromNavigationBar = tableView.rectForRow(at: indexPath).origin.y - navigationBarMaxY
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}
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self.dataSource.apply(update.items.snapshot(), animatingDifferences: false) { [weak self] in
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guard let self = self else { return }
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if
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let item = update.maintainScrollPosition,
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let indexPath = self.dataSource.indexPath(for: item) {
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self.tableView.scrollToRow(at: indexPath, at: .top, animated: false)
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if let offsetFromNavigationBar = offsetFromNavigationBar {
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self.tableView.contentOffset.y -= offsetFromNavigationBar
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}
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}
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self.updateAutoplayViews()
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}
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}
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func handle(event: CollectionItemEvent) {
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switch event {
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case .ignorableOutput:
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break
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case let .share(url):
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share(url: url)
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case let .navigation(navigation):
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switch navigation {
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case let .collection(collectionService):
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show(TableViewController(
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viewModel: CollectionItemsViewModel(
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collectionService: collectionService,
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identification: identification),
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identification: identification),
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sender: self)
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case let .profile(profileService):
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show(ProfileViewController(
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viewModel: ProfileViewModel(
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profileService: profileService,
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identification: identification),
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identification: identification),
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sender: self)
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case let .url(url):
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present(SFSafariViewController(url: url), animated: true)
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case .webfingerStart:
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webfingerIndicatorView.startAnimating()
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case .webfingerEnd:
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webfingerIndicatorView.stopAnimating()
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}
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case let .attachment(attachmentViewModel, statusViewModel):
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present(attachmentViewModel: attachmentViewModel, statusViewModel: statusViewModel)
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}
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}
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func present(attachmentViewModel: AttachmentViewModel, statusViewModel: StatusViewModel) {
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switch attachmentViewModel.attachment.type {
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case .audio, .video:
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let playerViewController = AVPlayerViewController()
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let player: AVPlayer
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if attachmentViewModel.attachment.type == .video {
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player = PlayerCache.shared.player(url: attachmentViewModel.attachment.url)
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} else {
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player = AVPlayer(url: attachmentViewModel.attachment.url)
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}
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playerViewController.delegate = self
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playerViewController.player = player
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present(playerViewController, animated: true) {
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try? AVAudioSession.sharedInstance().setCategory(.playback, mode: .default)
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player.isMuted = false
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player.play()
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}
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case .image, .gifv:
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let imagePageViewController = ImagePageViewController(
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initiallyVisible: attachmentViewModel,
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statusViewModel: statusViewModel)
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let imageNavigationController = ImageNavigationController(imagePageViewController: imagePageViewController)
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imageNavigationController.transitionController.fromDelegate = self
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transitionViewTag = attachmentViewModel.tag
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present(imageNavigationController, animated: true)
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case .unknown:
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break
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}
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}
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func set(expandAllState: ExpandAllState) {
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switch expandAllState {
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case .hidden:
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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", comment: ""),
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image: UIImage(systemName: "eye"),
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primaryAction: UIAction { [weak self] _ in self?.viewModel.toggleExpandAll() })
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case .collapse:
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navigationItem.rightBarButtonItem = UIBarButtonItem(
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title: NSLocalizedString("status.show-less", comment: ""),
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image: UIImage(systemName: "eye.slash"),
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primaryAction: UIAction { [weak self] _ in self?.viewModel.toggleExpandAll() })
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}
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}
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func share(url: URL) {
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let activityViewController = UIActivityViewController(activityItems: [url], applicationActivities: nil)
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present(activityViewController, animated: true, completion: nil)
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}
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func updateAutoplayViews() {
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if let visibleView = navigationController?.visibleViewController?.view,
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view.isDescendant(of: visibleView),
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let superview = view.superview,
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let attachmentsViewClosestToCenter = tableView.visibleCells
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.compactMap({ ($0.contentView as? StatusView)?.attachmentsView })
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.filter(\.shouldAutoplay)
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.min(by: {
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abs(superview.convert($0.frame, from: $0.superview).midY - view.frame.midY)
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< abs(superview.convert($1.frame, from: $1.superview).midY - view.frame.midY)
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}) {
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Self.autoplayableAttachmentsView.send(attachmentsViewClosestToCenter)
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} else {
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Self.autoplayableAttachmentsView.send(nil)
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}
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}
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}
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