2022-04-13 14:43:16 +02:00
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//
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// DiscoveryHashtagsViewController.swift
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// Mastodon
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//
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// Created by MainasuK on 2022-4-13.
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//
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import os.log
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import UIKit
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import Combine
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import MastodonUI
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final class DiscoveryHashtagsViewController: UIViewController, NeedsDependency, MediaPreviewableViewController {
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let logger = Logger(subsystem: "TrendPostsViewController", category: "ViewController")
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weak var context: AppContext! { willSet { precondition(!isViewLoaded) } }
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weak var coordinator: SceneCoordinator! { willSet { precondition(!isViewLoaded) } }
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var disposeBag = Set<AnyCancellable>()
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var viewModel: DiscoveryHashtagsViewModel!
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let mediaPreviewTransitionController = MediaPreviewTransitionController()
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lazy var tableView: UITableView = {
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let tableView = UITableView()
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tableView.rowHeight = UITableView.automaticDimension
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tableView.estimatedRowHeight = 100
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tableView.separatorStyle = .none
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tableView.backgroundColor = .clear
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return tableView
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}()
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2022-04-15 11:34:58 +02:00
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let refreshControl = UIRefreshControl()
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2022-04-13 14:43:16 +02:00
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deinit {
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
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}
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}
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extension DiscoveryHashtagsViewController {
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override func viewDidLoad() {
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super.viewDidLoad()
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view.backgroundColor = ThemeService.shared.currentTheme.value.secondarySystemBackgroundColor
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ThemeService.shared.currentTheme
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.receive(on: DispatchQueue.main)
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.sink { [weak self] theme in
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guard let self = self else { return }
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self.view.backgroundColor = theme.secondarySystemBackgroundColor
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}
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.store(in: &disposeBag)
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tableView.translatesAutoresizingMaskIntoConstraints = false
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view.addSubview(tableView)
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NSLayoutConstraint.activate([
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tableView.topAnchor.constraint(equalTo: view.topAnchor),
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tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
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tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
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tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
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])
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2022-04-15 11:34:58 +02:00
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tableView.refreshControl = refreshControl
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refreshControl.addTarget(self, action: #selector(DiscoveryHashtagsViewController.refreshControlValueChanged(_:)), for: .valueChanged)
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2022-04-13 14:43:16 +02:00
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tableView.delegate = self
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viewModel.setupDiffableDataSource(
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tableView: tableView
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)
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}
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override func viewWillAppear(_ animated: Bool) {
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super.viewWillAppear(animated)
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tableView.deselectRow(with: transitionCoordinator, animated: animated)
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}
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override func viewDidAppear(_ animated: Bool) {
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super.viewDidAppear(animated)
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viewModel.viewDidAppeared.send()
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}
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}
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2022-04-15 11:34:58 +02:00
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extension DiscoveryHashtagsViewController {
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@objc private func refreshControlValueChanged(_ sender: UIRefreshControl) {
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Task { @MainActor in
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do {
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try await viewModel.fetch()
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} catch {
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// do nothing
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}
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sender.endRefreshing()
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} // end Task
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}
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}
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2022-04-13 14:43:16 +02:00
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// MARK: - UITableViewDelegate
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extension DiscoveryHashtagsViewController: UITableViewDelegate {
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func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
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logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): \(indexPath)")
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guard case let .hashtag(tag) = viewModel.diffableDataSource?.itemIdentifier(for: indexPath) else { return }
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let hashtagTimelineViewModel = HashtagTimelineViewModel(context: context, hashtag: tag.name)
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coordinator.present(
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scene: .hashtagTimeline(viewModel: hashtagTimelineViewModel),
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from: self,
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transition: .show
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)
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}
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func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
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guard let cell = cell as? TrendTableViewCell else { return }
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guard let diffableDataSource = viewModel.diffableDataSource else { return }
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guard let item = diffableDataSource.itemIdentifier(for: indexPath) else { return }
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if let lastItem = diffableDataSource.snapshot().itemIdentifiers.last, item == lastItem {
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cell.configureSeparator(style: .edge)
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}
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}
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}
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// MARK: ScrollViewContainer
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extension DiscoveryHashtagsViewController: ScrollViewContainer {
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var scrollView: UIScrollView? {
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tableView
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}
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}
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2022-05-11 12:40:21 +02:00
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extension DiscoveryHashtagsViewController {
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override var keyCommands: [UIKeyCommand]? {
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return navigationKeyCommands
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}
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}
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// MARK: - TableViewControllerNavigateable
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extension DiscoveryHashtagsViewController: TableViewControllerNavigateable {
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@objc func navigateKeyCommandHandlerRelay(_ sender: UIKeyCommand) {
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navigateKeyCommandHandler(sender)
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}
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func navigate(direction: TableViewNavigationDirection) {
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if let indexPathForSelectedRow = tableView.indexPathForSelectedRow {
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// navigate up/down on the current selected item
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navigateToTag(direction: direction, indexPath: indexPathForSelectedRow)
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} else {
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// set first visible item selected
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2022-05-11 12:44:17 +02:00
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navigateToFirstVisibleTag()
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2022-05-11 12:40:21 +02:00
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}
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}
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private func navigateToTag(direction: TableViewNavigationDirection, indexPath: IndexPath) {
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guard let diffableDataSource = viewModel.diffableDataSource else { return }
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let items = diffableDataSource.snapshot().itemIdentifiers
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guard let selectedItem = diffableDataSource.itemIdentifier(for: indexPath),
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let selectedItemIndex = items.firstIndex(of: selectedItem) else {
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return
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}
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let _navigateToItem: DiscoveryItem? = {
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var index = selectedItemIndex
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while 0..<items.count ~= index {
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index = {
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switch direction {
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case .up: return index - 1
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case .down: return index + 1
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}
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}()
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guard 0..<items.count ~= index else { return nil }
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let item = items[index]
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guard Self.validNavigateableItem(item) else { continue }
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return item
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}
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return nil
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}()
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guard let item = _navigateToItem, let indexPath = diffableDataSource.indexPath(for: item) else { return }
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let scrollPosition: UITableView.ScrollPosition = overrideNavigationScrollPosition ?? Self.navigateScrollPosition(tableView: tableView, indexPath: indexPath)
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tableView.selectRow(at: indexPath, animated: true, scrollPosition: scrollPosition)
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}
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2022-05-11 12:44:17 +02:00
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private func navigateToFirstVisibleTag() {
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2022-05-11 12:40:21 +02:00
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guard let indexPathsForVisibleRows = tableView.indexPathsForVisibleRows else { return }
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guard let diffableDataSource = viewModel.diffableDataSource else { return }
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var visibleItems: [DiscoveryItem] = indexPathsForVisibleRows.sorted().compactMap { indexPath in
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guard let item = diffableDataSource.itemIdentifier(for: indexPath) else { return nil }
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guard Self.validNavigateableItem(item) else { return nil }
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return item
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}
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if indexPathsForVisibleRows.first?.row != 0, visibleItems.count > 1 {
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// drop first when visible not the first cell of table
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visibleItems.removeFirst()
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}
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guard let item = visibleItems.first, let indexPath = diffableDataSource.indexPath(for: item) else { return }
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let scrollPosition: UITableView.ScrollPosition = overrideNavigationScrollPosition ?? Self.navigateScrollPosition(tableView: tableView, indexPath: indexPath)
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tableView.selectRow(at: indexPath, animated: true, scrollPosition: scrollPosition)
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}
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static func validNavigateableItem(_ item: DiscoveryItem) -> Bool {
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switch item {
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case .hashtag:
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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 open() {
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guard let indexPathForSelectedRow = tableView.indexPathForSelectedRow else { return }
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guard let diffableDataSource = viewModel.diffableDataSource else { return }
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guard let item = diffableDataSource.itemIdentifier(for: indexPathForSelectedRow) else { return }
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guard case let .hashtag(tag) = item else { return }
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let hashtagTimelineViewModel = HashtagTimelineViewModel(context: context, hashtag: tag.name)
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coordinator.present(
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scene: .hashtagTimeline(viewModel: hashtagTimelineViewModel),
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from: self,
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transition: .show
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)
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}
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}
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