Convert edit list screen to collection view
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@ -10,18 +10,21 @@ import UIKit
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import Pachyderm
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import Combine
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class EditListAccountsViewController: EnhancedTableViewController {
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class EditListAccountsViewController: UIViewController, CollectionViewController {
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private var list: List
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let mastodonController: MastodonController
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private let mastodonController: MastodonController
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var changedAccounts = false
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private var state = State.unloaded
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var dataSource: DataSource!
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var nextRange: RequestRange?
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private(set) var changedAccounts = false
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var searchResultsController: SearchResultsViewController!
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var searchController: UISearchController!
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private var dataSource: UICollectionViewDiffableDataSource<Section, Item>!
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var collectionView: UICollectionView! { view as? UICollectionView }
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private var nextRange: RequestRange?
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private var searchResultsController: SearchResultsViewController!
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private var searchController: UISearchController!
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private var listRenamedCancellable: AnyCancellable?
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@ -29,7 +32,7 @@ class EditListAccountsViewController: EnhancedTableViewController {
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self.list = list
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self.mastodonController = mastodonController
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super.init(style: .plain)
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super.init(nibName: nil, bundle: nil)
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listChanged()
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@ -46,29 +49,45 @@ class EditListAccountsViewController: EnhancedTableViewController {
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fatalError("init(coder:) has not been implemeneted")
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}
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override func loadView() {
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var config = UICollectionLayoutListConfiguration(appearance: .grouped)
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config.itemSeparatorHandler = { [unowned self] indexPath, sectionConfig in
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var config = sectionConfig
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switch dataSource.itemIdentifier(for: indexPath)! {
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case .loadingIndicator:
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config.topSeparatorVisibility = .hidden
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config.bottomSeparatorVisibility = .hidden
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case .account(id: _):
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config.topSeparatorInsets = TimelineStatusCollectionViewCell.separatorInsets
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config.bottomSeparatorInsets = TimelineStatusCollectionViewCell.separatorInsets
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}
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return config
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}
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config.trailingSwipeActionsConfigurationProvider = { [unowned self] indexPath in
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switch dataSource.itemIdentifier(for: indexPath) {
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case .account(id: let id):
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let remove = UIContextualAction(style: .destructive, title: "Remove") { [unowned self] _, _, completion in
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Task {
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await self.removeAccount(id: id)
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completion(true)
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}
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}
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return UISwipeActionsConfiguration(actions: [remove])
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default:
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return nil
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}
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}
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let layout = UICollectionViewCompositionalLayout.list(using: config)
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view = UICollectionView(frame: .zero, collectionViewLayout: layout)
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collectionView.delegate = self
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collectionView.allowsSelection = false
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collectionView.backgroundColor = .appGroupedBackground
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dataSource = createDataSource()
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}
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override func viewDidLoad() {
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super.viewDidLoad()
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tableView.register(UINib(nibName: "AccountTableViewCell", bundle: .main), forCellReuseIdentifier: "accountCell")
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tableView.rowHeight = UITableView.automaticDimension
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tableView.estimatedRowHeight = 66
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tableView.allowsSelection = false
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tableView.backgroundColor = .appGroupedBackground
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dataSource = DataSource(tableView: tableView, cellProvider: { (tableView, indexPath, item) -> UITableViewCell? in
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guard case let .account(id) = item else { fatalError() }
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let cell = tableView.dequeueReusableCell(withIdentifier: "accountCell", for: indexPath) as! AccountTableViewCell
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cell.delegate = self
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cell.updateUI(accountID: id)
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cell.configurationUpdateHandler = { cell, state in
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cell.backgroundConfiguration = .appListGroupedCell(for: state)
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}
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return cell
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})
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dataSource.editListAccountsController = self
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searchResultsController = SearchResultsViewController(mastodonController: mastodonController, scope: .people)
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searchResultsController.following = true
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searchResultsController.delegate = self
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@ -87,7 +106,34 @@ class EditListAccountsViewController: EnhancedTableViewController {
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}
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navigationItem.rightBarButtonItem = UIBarButtonItem(title: NSLocalizedString("Rename", comment: "rename list button title"), style: .plain, target: self, action: #selector(renameButtonPressed))
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}
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private func createDataSource() -> UICollectionViewDiffableDataSource<Section, Item> {
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let loadingCell = UICollectionView.CellRegistration<LoadingCollectionViewCell, Void> { cell, indexPath, itemIdentifier in
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cell.indicator.startAnimating()
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}
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let accountCell = UICollectionView.CellRegistration<AccountCollectionViewCell, String> { [unowned self] cell, indexPath, itemIdentifier in
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cell.delegate = self
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cell.updateUI(accountID: itemIdentifier)
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cell.configurationUpdateHandler = { cell, state in
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cell.backgroundConfiguration = .appListGroupedCell(for: state)
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}
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}
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return UICollectionViewDiffableDataSource(collectionView: collectionView) { collectionView, indexPath, itemIdentifier in
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switch itemIdentifier {
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case .loadingIndicator:
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return collectionView.dequeueConfiguredReusableCell(using: loadingCell, for: indexPath, item: ())
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case .account(id: let id):
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return collectionView.dequeueConfiguredReusableCell(using: accountCell, for: indexPath, item: id)
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}
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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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clearSelectionOnAppear(animated: animated)
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Task {
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await loadAccounts()
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}
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@ -97,10 +143,21 @@ class EditListAccountsViewController: EnhancedTableViewController {
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title = String(format: NSLocalizedString("Edit %@", comment: "edit list screen title"), list.title)
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}
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func loadAccounts() async {
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@MainActor
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private func loadAccounts() async {
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guard state == .unloaded else { return }
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state = .loading
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async let results = try await mastodonController.run(List.getAccounts(list.id))
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var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
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snapshot.appendSections([.accounts])
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snapshot.appendItems([.loadingIndicator])
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await dataSource.apply(snapshot)
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do {
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let request = List.getAccounts(list.id)
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let (accounts, pagination) = try await mastodonController.run(request)
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let (accounts, pagination) = try await results
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self.nextRange = pagination?.older
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await withCheckedContinuation { continuation in
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@ -109,20 +166,61 @@ class EditListAccountsViewController: EnhancedTableViewController {
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}
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}
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var snapshot = self.dataSource.snapshot()
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if snapshot.indexOfSection(.accounts) == nil {
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snapshot.appendSections([.accounts])
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} else {
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snapshot.deleteItems(snapshot.itemIdentifiers(inSection: .accounts))
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}
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var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
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snapshot.appendSections([.accounts])
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snapshot.appendItems(accounts.map { .account(id: $0.id) })
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await dataSource.apply(snapshot)
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state = .loaded
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} catch {
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let config = ToastConfiguration(from: error, with: "Error Loading Accounts", in: self) { [unowned self] toast in
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toast.dismissToast(animated: true)
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await self.loadAccounts()
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}
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self.showToast(configuration: config, animated: true)
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state = .unloaded
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await dataSource.apply(.init())
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}
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}
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private func loadNextPage() async {
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guard state == .loaded,
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let nextRange else { return }
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state = .loading
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async let results = try await mastodonController.run(List.getAccounts(list.id, range: nextRange))
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let origSnapshot = dataSource.snapshot()
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var snapshot = origSnapshot
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snapshot.appendItems([.loadingIndicator])
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await dataSource.apply(snapshot)
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do {
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let (accounts, pagination) = try await results
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self.nextRange = pagination?.older
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await withCheckedContinuation { continuation in
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mastodonController.persistentContainer.addAll(accounts: accounts) {
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continuation.resume()
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}
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}
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var snapshot = origSnapshot
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snapshot.appendItems(accounts.map { .account(id: $0.id) })
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await dataSource.apply(snapshot)
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state = .loaded
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} catch {
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let config = ToastConfiguration(from: error, with: "Error Loading Accounts", in: self) { [unowned self] toast in
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toast.dismissToast(animated: true)
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await self.loadNextPage()
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}
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self.showToast(configuration: config, animated: true)
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state = .loaded
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await dataSource.apply(origSnapshot)
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}
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}
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@ -157,12 +255,6 @@ class EditListAccountsViewController: EnhancedTableViewController {
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}
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}
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// MARK: - Table view delegate
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override func tableView(_ tableView: UITableView, editingStyleForRowAt indexPath: IndexPath) -> UITableViewCell.EditingStyle {
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return .delete
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}
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// MARK: - Interaction
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@objc func renameButtonPressed() {
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@ -171,29 +263,31 @@ class EditListAccountsViewController: EnhancedTableViewController {
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}
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extension EditListAccountsViewController {
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enum State {
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case unloaded
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case loading
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case loaded
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case loadingOlder
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}
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}
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extension EditListAccountsViewController {
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enum Section: Hashable {
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case accounts
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}
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enum Item: Hashable {
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case loadingIndicator
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case account(id: String)
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}
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class DataSource: UITableViewDiffableDataSource<Section, Item> {
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weak var editListAccountsController: EditListAccountsViewController?
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override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
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return true
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}
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override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
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guard editingStyle == .delete,
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case let .account(id) = itemIdentifier(for: indexPath) else {
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return
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}
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}
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extension EditListAccountsViewController: UICollectionViewDelegate {
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func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
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if state == .loaded,
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indexPath.item == collectionView.numberOfItems(inSection: indexPath.section) - 1 {
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Task {
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await self.editListAccountsController?.removeAccount(id: id)
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await loadNextPage()
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}
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}
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}
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