310 lines
12 KiB
Swift
310 lines
12 KiB
Swift
//
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// HomeViewController.swift
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// Reader
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//
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// Created by Shadowfacts on 11/25/21.
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//
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import UIKit
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import CoreData
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protocol HomeViewControllerDelegate: AnyObject {
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func switchToAccount(_ account: LocalData.Account)
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}
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class HomeViewController: UIViewController {
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weak var delegate: HomeViewControllerDelegate?
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weak var itemsDelegate: ItemsViewControllerDelegate?
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let fervorController: FervorController
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var enableStretchyMenu = true
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private var collectionView: UICollectionView!
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private var dataSource: UICollectionViewDiffableDataSource<Section, Item>!
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private var groupResultsController: NSFetchedResultsController<Group>!
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private var feedResultsController: NSFetchedResultsController<Feed>!
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init(fervorController: FervorController) {
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self.fervorController = fervorController
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super.init(nibName: nil, bundle: nil)
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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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// todo: account info
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title = "Reader"
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if enableStretchyMenu {
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view.addInteraction(StretchyMenuInteraction(delegate: self))
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}
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if UIDevice.current.userInterfaceIdiom != .mac {
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view.backgroundColor = .appBackground
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}
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var config = UICollectionLayoutListConfiguration(appearance: UIDevice.current.userInterfaceIdiom == .mac ? .sidebar : .grouped)
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config.headerMode = .supplementary
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config.backgroundColor = .clear
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config.separatorConfiguration.topSeparatorVisibility = .visible
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config.separatorConfiguration.topSeparatorInsets = NSDirectionalEdgeInsets(top: 0, leading: 20, bottom: 0, trailing: 0)
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config.separatorConfiguration.bottomSeparatorVisibility = .hidden
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config.itemSeparatorHandler = { indexPath, defaultConfig in
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var config = defaultConfig
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if indexPath.section == 0 && indexPath.row == 0 {
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config.topSeparatorVisibility = .hidden
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}
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return config
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}
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let layout = UICollectionViewCompositionalLayout.list(using: config)
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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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view.addSubview(collectionView)
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dataSource = createDataSource()
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var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
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snapshot.appendSections([.all, .groups, .feeds])
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snapshot.appendItems([.unread, .all], toSection: .all)
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dataSource.apply(snapshot, animatingDifferences: false)
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let groupReq = Group.fetchRequest()
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groupReq.sortDescriptors = [NSSortDescriptor(key: "title", ascending: true)]
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groupResultsController = NSFetchedResultsController(fetchRequest: groupReq, managedObjectContext: fervorController.persistentContainer.viewContext, sectionNameKeyPath: nil, cacheName: nil)
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groupResultsController.delegate = self
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try! groupResultsController.performFetch()
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let feedReq = Feed.fetchRequest()
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feedReq.sortDescriptors = [NSSortDescriptor(key: "title", ascending: true)]
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feedResultsController = NSFetchedResultsController(fetchRequest: feedReq, managedObjectContext: fervorController.persistentContainer.viewContext, sectionNameKeyPath: nil, cacheName: nil)
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feedResultsController.delegate = self
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try! feedResultsController.performFetch()
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}
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override func viewWillAppear(_ animated: Bool) {
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super.viewWillAppear(animated)
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if let indexPaths = collectionView.indexPathsForSelectedItems {
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for indexPath in indexPaths {
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collectionView.deselectItem(at: indexPath, animated: true)
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}
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}
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var snapshot = dataSource.snapshot()
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// reconfigure so that unread counts update
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snapshot.reconfigureItems(snapshot.itemIdentifiers)
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dataSource.apply(snapshot)
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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) { supplementaryView, elementKind, indexPath in
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let section = self.dataSource.sectionIdentifier(for: indexPath.section)!
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var config = supplementaryView.defaultContentConfiguration()
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config.text = section.title
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supplementaryView.contentConfiguration = config
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}
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let listCell = UICollectionView.CellRegistration<HomeCollectionViewCell, Item> { cell, indexPath, item in
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var config = UIListContentConfiguration.valueCell()
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config.text = item.title
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if let req = item.countFetchRequest,
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let count = try? self.fervorController.persistentContainer.viewContext.count(for: req) {
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config.secondaryText = "\(count)"
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config.secondaryTextProperties.color = .tintColor
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}
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cell.contentConfiguration = config
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cell.accessories = [.disclosureIndicator()]
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}
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let dataSource = UICollectionViewDiffableDataSource<Section, Item>(collectionView: collectionView) { collectionView, indexPath, item in
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return collectionView.dequeueConfiguredReusableCell(using: listCell, for: indexPath, item: item)
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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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}
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extension HomeViewController {
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enum Section: Hashable {
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case all
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case groups
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case feeds
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var title: String {
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switch self {
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case .all:
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return ""
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case .groups:
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return "Groups"
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case .feeds:
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return "Feeds"
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}
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}
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}
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enum Item: Hashable {
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case unread
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case all
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case group(Group)
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case feed(Feed)
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var title: String {
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switch self {
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case .unread:
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return "Unread Articles"
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case .all:
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return "All Articles"
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case let .group(group):
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return group.title
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case let .feed(feed):
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return feed.title!
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}
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}
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var fetchRequest: NSFetchRequest<Reader.Item> {
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let req = Reader.Item.fetchRequest()
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switch self {
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case .unread:
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req.predicate = NSPredicate(format: "read = NO")
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case .all:
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break
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case .group(let group):
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req.predicate = NSPredicate(format: "feed in %@", group.feeds!)
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case .feed(let feed):
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req.predicate = NSPredicate(format: "feed = %@", feed)
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}
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return req
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}
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var idFetchRequest: NSFetchRequest<NSManagedObjectID> {
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let req = NSFetchRequest<NSManagedObjectID>(entityName: "Item")
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req.resultType = .managedObjectIDResultType
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switch self {
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case .unread:
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req.predicate = NSPredicate(format: "read = NO")
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case .all:
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break
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case .group(let group):
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req.predicate = NSPredicate(format: "feed in %@", group.feeds!)
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case .feed(let feed):
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req.predicate = NSPredicate(format: "feed = %@", feed)
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}
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return req
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}
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var countFetchRequest: NSFetchRequest<Reader.Item>? {
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let req = Reader.Item.fetchRequest()
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switch self {
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case .unread:
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req.predicate = NSPredicate(format: "read = NO")
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case .all:
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return nil
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case .group(let group):
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req.predicate = NSPredicate(format: "read = NO AND feed in %@", group.feeds!)
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case .feed(let feed):
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req.predicate = NSPredicate(format: "read = NO AND feed = %@", feed)
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}
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return req
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}
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}
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}
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extension HomeViewController: NSFetchedResultsControllerDelegate {
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func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChangeContentWith snapshot: NSDiffableDataSourceSnapshotReference) {
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var snapshot = dataSource.snapshot()
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if controller == groupResultsController {
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if snapshot.sectionIdentifiers.contains(.groups) {
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snapshot.deleteItems(snapshot.itemIdentifiers(inSection: .groups))
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}
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snapshot.appendItems(controller.fetchedObjects!.map { .group($0 as! Group) }, toSection: .groups)
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} else if controller == feedResultsController {
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if snapshot.sectionIdentifiers.contains(.feeds) {
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snapshot.deleteItems(snapshot.itemIdentifiers(inSection: .feeds))
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}
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snapshot.appendItems(controller.fetchedObjects!.map { .feed($0 as! Feed) }, toSection: .feeds)
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}
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dataSource.apply(snapshot, animatingDifferences: false)
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}
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}
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extension HomeViewController: 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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let vc = ItemsViewController(fetchRequest: item.idFetchRequest, fervorController: fervorController)
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vc.title = item.title
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vc.delegate = itemsDelegate
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show(vc, sender: nil)
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UISelectionFeedbackGenerator().selectionChanged()
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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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return UIContextMenuConfiguration(identifier: nil, previewProvider: {
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return ItemsViewController(fetchRequest: item.idFetchRequest, fervorController: self.fervorController)
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}, actionProvider: nil)
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}
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func collectionView(_ collectionView: UICollectionView, willPerformPreviewActionForMenuWith configuration: UIContextMenuConfiguration, animator: UIContextMenuInteractionCommitAnimating) {
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guard let vc = animator.previewViewController else {
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return
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}
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animator.preferredCommitStyle = .pop
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animator.addCompletion {
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self.show(vc, sender: nil)
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}
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}
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}
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extension HomeViewController: StretchyMenuInteractionDelegate {
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func stretchyMenuTitle() -> String? {
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return "Switch Accounts"
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}
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func stretchyMenuItems() -> [StretchyMenuItem] {
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var items: [StretchyMenuItem] = LocalData.accounts.map { account in
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var title = account.instanceURL.host!
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if let port = account.instanceURL.port, port != 80 && port != 443 {
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title += ":\(port)"
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}
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let subtitle = account.id == fervorController.account!.id ? "Currently logged in" : nil
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return StretchyMenuItem(title: title, subtitle: subtitle) { [unowned self] in
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guard account.id != self.fervorController.account!.id else { return }
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self.delegate?.switchToAccount(account)
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}
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}
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items.append(StretchyMenuItem(title: "Add Account", subtitle: nil, action: { [unowned self] in
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let login = LoginViewController()
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login.delegate = self
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login.navigationItem.leftBarButtonItem = UIBarButtonItem(systemItem: .cancel, primaryAction: UIAction(handler: { (_) in
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self.dismiss(animated: true)
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}), menu: nil)
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let nav = UINavigationController(rootViewController: login)
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self.present(nav, animated: true)
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}))
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return items
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}
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}
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extension HomeViewController: LoginViewControllerDelegate {
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func didLogin(with controller: FervorController) {
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self.dismiss(animated: true)
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(view.window!.windowScene!.delegate as! SceneDelegate).didLogin(with: controller)
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}
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}
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