289 lines
10 KiB
Swift
289 lines
10 KiB
Swift
//
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// AccountFollowsListViewController.swift
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// Tusker
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//
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// Created by Shadowfacts on 1/18/23.
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// Copyright © 2023 Shadowfacts. All rights reserved.
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//
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import UIKit
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import Pachyderm
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class AccountFollowsListViewController: UIViewController, CollectionViewController {
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private static nonisolated let pageSize = 40
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let accountID: String
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let mastodonController: MastodonController
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let mode: AccountFollowsViewController.Mode
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var collectionView: UICollectionView! {
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view as? UICollectionView
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}
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private var dataSource: UICollectionViewDiffableDataSource<Section, Item>!
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private var state: State = .unloaded
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private var newer: RequestRange?
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private var older: RequestRange?
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init(accountID: String, mastodonController: MastodonController, mode: AccountFollowsViewController.Mode) {
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self.accountID = accountID
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self.mastodonController = mastodonController
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self.mode = mode
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super.init(nibName: nil, bundle: nil)
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title = mode.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 loadView() {
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var config = UICollectionLayoutListConfiguration(appearance: .plain)
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config.backgroundColor = .appBackground
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config.itemSeparatorHandler = { [unowned self] indexPath, sectionConfig in
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guard let item = self.dataSource.itemIdentifier(for: indexPath) else {
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return sectionConfig
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}
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var config = sectionConfig
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if item.hideSeparators {
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config.topSeparatorVisibility = .hidden
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config.bottomSeparatorVisibility = .hidden
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}
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return config
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}
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let layout = UICollectionViewCompositionalLayout { sectionIndex, environment in
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let section = NSCollectionLayoutSection.list(using: config, layoutEnvironment: environment)
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section.readableContentInset(in: environment)
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return section
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}
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view = UICollectionView(frame: .zero, collectionViewLayout: layout)
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collectionView.delegate = self
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collectionView.dragDelegate = self
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collectionView.allowsFocus = true
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dataSource = createDataSource()
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}
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private func createDataSource() -> UICollectionViewDiffableDataSource<Section, Item> {
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let accountCell = UICollectionView.CellRegistration<AccountCollectionViewCell, String> { [unowned self] cell, indexPath, item in
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cell.delegate = self
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cell.updateUI(accountID: item)
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cell.configurationUpdateHandler = { cell, state in
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cell.backgroundConfiguration = .appListPlainCell(for: state)
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}
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}
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let loadingCell = UICollectionView.CellRegistration<LoadingCollectionViewCell, Void> { cell, indexPath, item in
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cell.indicator.startAnimating()
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}
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return UICollectionViewDiffableDataSource(collectionView: collectionView, cellProvider: { collectionView, indexPath, itemIdentifier in
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switch itemIdentifier {
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case .account(let id):
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return collectionView.dequeueConfiguredReusableCell(using: accountCell, for: indexPath, item: id)
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case .loadingIndicator:
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return collectionView.dequeueConfiguredReusableCell(using: loadingCell, for: indexPath, item: ())
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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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if case .unloaded = state {
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Task {
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await loadInitial()
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}
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}
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}
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private nonisolated func request(for range: RequestRange) -> Request<[Account]> {
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switch mode {
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case .following:
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return Account.getFollowing(accountID, range: range.withCount(Self.pageSize))
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case .followers:
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return Account.getFollowers(accountID, range: range.withCount(Self.pageSize))
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}
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}
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private func apply(snapshot: NSDiffableDataSourceSnapshot<Section, Item>) async {
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await Task { @MainActor in
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self.dataSource.apply(snapshot)
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}.value
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}
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@MainActor
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private func loadInitial() async {
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guard case .unloaded = state else {
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return
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}
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self.state = .loadingInitial
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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 apply(snapshot: snapshot)
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do {
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let (accounts, pagination) = try await mastodonController.run(request(for: .default))
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await mastodonController.persistentContainer.addAll(accounts: accounts)
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guard case .loadingInitial = self.state else {
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return
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}
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self.state = .loaded
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self.newer = pagination?.newer
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self.older = pagination?.older
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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($0.id) })
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await apply(snapshot: snapshot)
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} catch {
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self.state = .unloaded
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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.loadInitial()
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}
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self.showToast(configuration: config, animated: true)
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}
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}
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@MainActor
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private func loadOlder() async {
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guard case .loaded = state,
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let older else {
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return
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}
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self.state = .loadingOlder
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var snapshot = dataSource.snapshot()
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snapshot.appendItems([.loadingIndicator])
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await apply(snapshot: snapshot)
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do {
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let (accounts, pagination) = try await mastodonController.run(request(for: older))
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await mastodonController.persistentContainer.addAll(accounts: accounts)
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guard case .loadingOlder = self.state else {
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return
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}
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self.state = .loaded
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self.older = pagination?.older
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var snapshot = dataSource.snapshot()
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snapshot.deleteItems([.loadingIndicator])
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snapshot.appendItems(accounts.map { .account($0.id) })
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await apply(snapshot: snapshot)
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} catch {
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self.state = .loaded
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let config = ToastConfiguration(from: error, with: "Error Loading More", in: self) { [unowned self] toast in
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toast.dismissToast(animated: true)
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await self.loadOlder()
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}
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self.showToast(configuration: config, animated: true)
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}
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}
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}
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extension AccountFollowsListViewController {
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enum State {
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case unloaded
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case loadingInitial
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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 AccountFollowsListViewController {
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enum Section {
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case accounts
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}
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enum Item: Hashable {
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case account(String)
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case loadingIndicator
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var hideSeparators: Bool {
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switch self {
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case .account(_):
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return false
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case .loadingIndicator:
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return true
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}
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}
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}
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}
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extension AccountFollowsListViewController: UICollectionViewDelegate {
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func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
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if indexPath.section == collectionView.numberOfSections - 1,
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indexPath.row == collectionView.numberOfItems(inSection: indexPath.section) - 1 {
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Task {
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await self.loadOlder()
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}
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}
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}
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func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
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guard case .account(let id) = dataSource.itemIdentifier(for: indexPath) else {
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return
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}
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selected(account: id)
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}
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func collectionView(_ collectionView: UICollectionView, contextMenuConfigurationForItemAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration? {
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guard case .account(let id) = dataSource.itemIdentifier(for: indexPath),
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let cell = collectionView.cellForItem(at: indexPath) else {
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return nil
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}
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return UIContextMenuConfiguration {
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ProfileViewController(accountID: id, mastodonController: self.mastodonController)
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} actionProvider: { _ in
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UIMenu(children: self.actionsForProfile(accountID: id, source: .view(cell)))
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}
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}
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func collectionView(_ collectionView: UICollectionView, willPerformPreviewActionForMenuWith configuration: UIContextMenuConfiguration, animator: UIContextMenuInteractionCommitAnimating) {
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MenuPreviewHelper.willPerformPreviewAction(animator: animator, presenter: self)
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}
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}
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extension AccountFollowsListViewController: UICollectionViewDragDelegate {
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func collectionView(_ collectionView: UICollectionView, itemsForBeginning session: UIDragSession, at indexPath: IndexPath) -> [UIDragItem] {
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guard case .account(let id) = dataSource.itemIdentifier(for: indexPath),
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let currentAccountID = mastodonController.accountInfo?.id,
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let account = mastodonController.persistentContainer.account(for: id) else {
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return []
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}
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let provider = NSItemProvider(object: account.url as NSURL)
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let activity = UserActivityManager.showProfileActivity(id: id, accountID: currentAccountID)
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activity.displaysAuxiliaryScene = true
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provider.registerObject(activity, visibility: .all)
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return [UIDragItem(itemProvider: provider)]
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}
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}
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extension AccountFollowsListViewController: TuskerNavigationDelegate {
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var apiController: MastodonController! { mastodonController }
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}
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extension AccountFollowsListViewController: MenuActionProvider {
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}
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extension AccountFollowsListViewController: ToastableViewController {
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}
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extension AccountFollowsListViewController: StatusBarTappableViewController {
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func handleStatusBarTapped(xPosition: CGFloat) -> StatusBarTapActionResult {
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collectionView.scrollToTop()
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return .stop
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}
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}
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