330 lines
13 KiB
Swift
330 lines
13 KiB
Swift
//
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// SearchViewController.swift
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// Tusker
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//
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// Created by Shadowfacts on 6/24/20.
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// Copyright © 2020 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 SafariServices
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import WebURLFoundationExtras
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class SearchViewController: UIViewController {
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weak var mastodonController: MastodonController!
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private var collectionView: UICollectionView!
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private var dataSource: UICollectionViewDiffableDataSource<Section, Item>!
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var resultsController: SearchResultsViewController!
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var searchController: UISearchController!
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var searchControllerStatusOnAppearance: Bool? = nil
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init(mastodonController: MastodonController) {
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self.mastodonController = mastodonController
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super.init(nibName: nil, bundle: nil)
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title = NSLocalizedString("Explore", comment: "explore tab title")
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}
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required init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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override func viewDidLoad() {
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super.viewDidLoad()
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let layout = UICollectionViewCompositionalLayout { [unowned self] sectionIndex, environment in
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let sectionIdentifier = self.dataSource.snapshot().sectionIdentifiers[sectionIndex]
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switch sectionIdentifier {
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case .trendingHashtags:
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var listConfig = UICollectionLayoutListConfiguration(appearance: .grouped)
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listConfig.headerMode = .supplementary
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return .list(using: listConfig, layoutEnvironment: environment)
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case .trendingLinks:
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let itemSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1), heightDimension: .fractionalHeight(1))
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let item = NSCollectionLayoutItem(layoutSize: itemSize)
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// todo: i really wish i could just say the height is automatic and let autolayout figure out what it needs to be
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// using .estimated(whatever) constrains the height to exactly whatever
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let groupSize = NSCollectionLayoutSize(widthDimension: .absolute(250), heightDimension: .estimated(280))
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let group = NSCollectionLayoutGroup.horizontal(layoutSize: groupSize, subitems: [item])
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group.edgeSpacing = NSCollectionLayoutEdgeSpacing(leading: .fixed(8), top: nil, trailing: .fixed(8), bottom: nil)
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let section = NSCollectionLayoutSection(group: group)
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section.orthogonalScrollingBehavior = .continuousGroupLeadingBoundary
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section.boundarySupplementaryItems = [
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NSCollectionLayoutBoundarySupplementaryItem(layoutSize: NSCollectionLayoutSize(widthDimension: .fractionalWidth(1), heightDimension: .estimated(12)), elementKind: UICollectionView.elementKindSectionHeader, alignment: .topLeading)
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]
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return section
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default:
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fatalError("unimplemented")
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}
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}
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collectionView = UICollectionView(frame: view.bounds, collectionViewLayout: layout)
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collectionView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
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collectionView.delegate = self
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collectionView.dragDelegate = self
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collectionView.backgroundColor = .secondarySystemBackground
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view.addSubview(collectionView)
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dataSource = createDataSource()
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resultsController = SearchResultsViewController(mastodonController: mastodonController)
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resultsController.exploreNavigationController = self.navigationController
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searchController = UISearchController(searchResultsController: resultsController)
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searchController.obscuresBackgroundDuringPresentation = true
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searchController.searchBar.autocapitalizationType = .none
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searchController.searchBar.delegate = resultsController
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searchController.hidesNavigationBarDuringPresentation = false
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definesPresentationContext = true
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navigationItem.searchController = searchController
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navigationItem.hidesSearchBarWhenScrolling = false
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if #available(iOS 16.0, *) {
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navigationItem.preferredSearchBarPlacement = .stacked
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}
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NotificationCenter.default.addObserver(self, selector: #selector(preferencesChanged), name: .preferencesChanged, object: nil)
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}
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override func viewWillAppear(_ animated: Bool) {
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super.viewWillAppear(animated)
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Task(priority: .userInitiated) {
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if (try? await mastodonController.getOwnInstance()) != nil {
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await applySnapshot()
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}
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}
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}
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override func viewDidAppear(_ animated: Bool) {
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super.viewDidAppear(animated)
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// this is a workaround for the issue that setting isActive on a search controller that is not visible
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// does not cause it to automatically become active once it becomes visible
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// see FB7814561
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if let active = searchControllerStatusOnAppearance {
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searchController.isActive = active
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searchControllerStatusOnAppearance = nil
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}
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}
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private func createDataSource() -> UICollectionViewDiffableDataSource<Section, Item> {
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let sectionHeaderCell = UICollectionView.SupplementaryRegistration<UICollectionViewListCell>(elementKind: UICollectionView.elementKindSectionHeader) { [unowned self] (headerView, collectionView, indexPath) in
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let section = self.dataSource.snapshot().sectionIdentifiers[indexPath.section]
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var config = UIListContentConfiguration.groupedHeader()
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config.text = section.title
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headerView.contentConfiguration = config
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}
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let trendingHashtagCell = UICollectionView.CellRegistration<TrendingHashtagCollectionViewCell, Hashtag> { (cell, indexPath, hashtag) in
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cell.updateUI(hashtag: hashtag)
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}
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let trendingLinkCell = UICollectionView.CellRegistration<TrendingLinkCardCollectionViewCell, Card>(cellNib: UINib(nibName: "TrendingLinkCardCollectionViewCell", bundle: .main)) { (cell, indexPath, card) in
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cell.updateUI(card: card)
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}
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let dataSource = UICollectionViewDiffableDataSource<Section, Item>(collectionView: collectionView) { collectionView, indexPath, item in
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switch item {
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case let .tag(hashtag):
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return collectionView.dequeueConfiguredReusableCell(using: trendingHashtagCell, for: indexPath, item: hashtag)
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case let .link(card):
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return collectionView.dequeueConfiguredReusableCell(using: trendingLinkCell, for: indexPath, item: card)
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default:
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fatalError("todo")
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}
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}
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dataSource.supplementaryViewProvider = { (collectionView, elementKind, indexPath) in
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if elementKind == UICollectionView.elementKindSectionHeader {
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return collectionView.dequeueConfiguredReusableSupplementary(using: sectionHeaderCell, for: indexPath)
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} else {
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return nil
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}
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}
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return dataSource
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}
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@MainActor
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private func applySnapshot() async {
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guard mastodonController.instanceFeatures.trends,
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!Preferences.shared.hideDiscover else {
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await dataSource.apply(NSDiffableDataSourceSnapshot())
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return
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}
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var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
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let hashtagsReq = Client.getTrendingHashtags(limit: 5)
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async let hashtags = try? mastodonController.run(hashtagsReq).0
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let linksReq = Client.getTrendingLinks(limit: 10)
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async let links = try? mastodonController.run(linksReq).0
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if let hashtags = await hashtags {
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snapshot.appendSections([.trendingHashtags])
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snapshot.appendItems(hashtags.map { .tag($0) }, toSection: .trendingHashtags)
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}
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if let links = await links {
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snapshot.appendSections([.trendingLinks])
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snapshot.appendItems(links.map { .link($0) }, toSection: .trendingLinks)
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}
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await dataSource.apply(snapshot)
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}
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@objc private func preferencesChanged() {
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Task {
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await applySnapshot()
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}
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}
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}
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extension SearchViewController {
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enum Section {
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case trendingHashtags
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case trendingLinks
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case trendingStatuses
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case profileSuggestions
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var title: String {
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switch self {
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case .trendingHashtags:
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return "Trending Hashtags"
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case .trendingLinks:
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return "Trending Links"
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case .trendingStatuses:
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return "Trending Statuses"
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case .profileSuggestions:
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return "Suggested Accounts"
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}
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}
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}
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enum Item: Equatable, Hashable {
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case status(String)
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case tag(Hashtag)
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case link(Card)
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static func == (lhs: SearchViewController.Item, rhs: SearchViewController.Item) -> Bool {
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switch (lhs, rhs) {
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case let (.status(a), .status(b)):
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return a == b
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case let (.tag(a), .tag(b)):
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return a == b
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case let (.link(a), .link(b)):
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return a.url == b.url
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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 let .status(id):
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hasher.combine("status")
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hasher.combine(id)
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case let .tag(tag):
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hasher.combine("tag")
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hasher.combine(tag.name)
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case let .link(card):
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hasher.combine("link")
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hasher.combine(card.url)
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}
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}
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}
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}
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extension SearchViewController: UICollectionViewDelegate {
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func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
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guard let item = dataSource.itemIdentifier(for: indexPath) else {
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return
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}
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switch item {
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case let .tag(hashtag):
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show(HashtagTimelineViewController(for: hashtag, mastodonController: mastodonController), sender: nil)
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case let .link(card):
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if let url = URL(card.url) {
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selected(url: url)
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}
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default:
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fatalError("todo")
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}
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}
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func collectionView(_ collectionView: UICollectionView, contextMenuConfigurationForItemAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration? {
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guard let item = dataSource.itemIdentifier(for: indexPath) else {
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return nil
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}
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switch item {
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case let .tag(hashtag):
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return UIContextMenuConfiguration(identifier: nil) {
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HashtagTimelineViewController(for: hashtag, mastodonController: self.mastodonController)
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} actionProvider: { (_) in
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UIMenu(children: self.actionsForHashtag(hashtag, source: .view(self.collectionView.cellForItem(at: indexPath))))
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}
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case let .link(card):
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guard let url = URL(card.url) else {
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return nil
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}
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return UIContextMenuConfiguration {
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SFSafariViewController(url: url)
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} actionProvider: { _ in
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UIMenu(children: self.actionsForTrendingLink(card: card))
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}
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default:
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fatalError("todo")
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}
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}
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}
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extension SearchViewController: UICollectionViewDragDelegate {
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func collectionView(_ collectionView: UICollectionView, itemsForBeginning session: UIDragSession, at indexPath: IndexPath) -> [UIDragItem] {
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guard let item = dataSource.itemIdentifier(for: indexPath) else {
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return []
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}
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switch item {
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case let .tag(hashtag):
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guard let url = URL(hashtag.url) else {
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return []
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}
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let provider = NSItemProvider(object: url as NSURL)
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if let activity = UserActivityManager.showTimelineActivity(timeline: .tag(hashtag: hashtag.name), accountID: mastodonController.accountInfo!.id) {
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activity.displaysAuxiliaryScene = true
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provider.registerObject(activity, visibility: .all)
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}
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return [UIDragItem(itemProvider: provider)]
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case let .link(card):
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guard let url = URL(card.url) else {
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return []
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}
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return [UIDragItem(itemProvider: NSItemProvider(object: url as NSURL))]
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default:
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fatalError("todo")
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}
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}
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}
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extension SearchViewController: TuskerNavigationDelegate {
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var apiController: MastodonController! { mastodonController }
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}
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extension SearchViewController: ToastableViewController {
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}
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extension SearchViewController: MenuActionProvider {
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}
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