mastodon-ios/Mastodon/Scene/Account/AccountViewController.swift

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//
// AccountViewController.swift
// Mastodon
//
// Created by Cirno MainasuK on 2021-9-13.
//
import os.log
import UIKit
import Combine
import CoreDataStack
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import PanModal
import MastodonAsset
import MastodonLocalization
import MastodonCore
final class AccountListViewController: UIViewController, NeedsDependency {
let logger = Logger(subsystem: "AccountListViewController", category: "UI")
weak var context: AppContext! { willSet { precondition(!isViewLoaded) } }
weak var coordinator: SceneCoordinator! { willSet { precondition(!isViewLoaded) } }
var disposeBag = Set<AnyCancellable>()
var viewModel: AccountListViewModel!
private(set) lazy var addBarButtonItem: UIBarButtonItem = {
let barButtonItem = UIBarButtonItem(
image: UIImage(systemName: "plus"),
style: .plain,
target: self,
action: #selector(AccountListViewController.addBarButtonItem(_:))
)
return barButtonItem
}()
lazy var dragIndicatorView = DragIndicatorView { [weak self] in
self?.dismiss(animated: true, completion: nil)
}
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var hasLoaded = false
private(set) lazy var tableView: UITableView = {
let tableView = UITableView()
tableView.register(AccountListTableViewCell.self, forCellReuseIdentifier: String(describing: AccountListTableViewCell.self))
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tableView.register(AddAccountTableViewCell.self, forCellReuseIdentifier: String(describing: AddAccountTableViewCell.self))
tableView.backgroundColor = .clear
tableView.separatorStyle = .none
tableView.tableFooterView = UIView()
return tableView
}()
override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
.portraitOnPhone
}
}
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// MARK: - PanModalPresentable
extension AccountListViewController: PanModalPresentable {
var panScrollable: UIScrollView? { tableView }
var showDragIndicator: Bool { false }
var shortFormHeight: PanModalHeight {
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func calculateHeight(of numberOfItems: Int) -> CGFloat {
return CGFloat(numberOfItems * 60 + 64)
}
if hasLoaded {
let height = calculateHeight(of: viewModel.diffableDataSource.snapshot().numberOfItems)
return .contentHeight(CGFloat(height))
}
let request = MastodonAuthentication.sortedFetchRequest
let authenticationCount = (try? context.managedObjectContext.count(for: request)) ?? 0
let count = authenticationCount + 1
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let height = calculateHeight(of: count)
return .contentHeight(height)
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}
var longFormHeight: PanModalHeight {
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return .maxHeightWithTopInset(0)
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}
}
extension AccountListViewController {
override func viewDidLoad() {
super.viewDidLoad()
setupBackgroundColor(theme: ThemeService.shared.currentTheme.value)
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ThemeService.shared.currentTheme
.receive(on: DispatchQueue.main)
.sink { [weak self] theme in
guard let self = self else { return }
self.setupBackgroundColor(theme: theme)
}
.store(in: &disposeBag)
navigationItem.rightBarButtonItem = addBarButtonItem
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dragIndicatorView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(dragIndicatorView)
NSLayoutConstraint.activate([
dragIndicatorView.topAnchor.constraint(equalTo: view.topAnchor),
dragIndicatorView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
dragIndicatorView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
dragIndicatorView.heightAnchor.constraint(equalToConstant: DragIndicatorView.height).priority(.required - 1),
])
tableView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(tableView)
NSLayoutConstraint.activate([
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tableView.topAnchor.constraint(equalTo: dragIndicatorView.bottomAnchor),
tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
])
tableView.delegate = self
viewModel.setupDiffableDataSource(
tableView: tableView,
managedObjectContext: context.managedObjectContext
)
viewModel.dataSourceDidUpdate
.receive(on: DispatchQueue.main)
.sink { [weak self, weak presentingViewController] in
guard let self = self else { return }
// the presentingViewController may deinit.
// Hold it and check the window to prevent PanModel crash
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guard let _ = presentingViewController else { return }
guard self.view.window != nil else { return }
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self.hasLoaded = true
self.panModalSetNeedsLayoutUpdate() // <<< may crash the app
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self.panModalTransition(to: .shortForm)
}
.store(in: &disposeBag)
}
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private func setupBackgroundColor(theme: Theme) {
let backgroundColor = UIColor { traitCollection in
switch traitCollection.userInterfaceLevel {
case .elevated where traitCollection.userInterfaceStyle == .dark:
return theme.systemElevatedBackgroundColor
default:
return theme.systemBackgroundColor.withAlphaComponent(0.9)
}
}
view.backgroundColor = backgroundColor
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}
}
extension AccountListViewController {
@objc private func addBarButtonItem(_ sender: UIBarButtonItem) {
logger.debug("\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public)")
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_ = coordinator.present(scene: .welcome, from: self, transition: .modal(animated: true, completion: nil))
}
override func accessibilityPerformEscape() -> Bool {
logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public)")
dismiss(animated: true, completion: nil)
return true
}
}
// MARK: - UITableViewDelegate
extension AccountListViewController: UITableViewDelegate {
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.deselectRow(at: indexPath, animated: true)
guard let diffableDataSource = viewModel.diffableDataSource else { return }
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guard let item = diffableDataSource.itemIdentifier(for: indexPath) else { return }
switch item {
case .authentication(let record):
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assert(Thread.isMainThread)
guard let authentication = record.object(in: context.managedObjectContext) else { return }
Task { @MainActor in
let isActive = try await context.authenticationService.activeMastodonUser(domain: authentication.domain, userID: authentication.userID)
guard isActive else { return }
self.coordinator.setup()
} // end Task
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case .addAccount:
// TODO: add dismiss entry for welcome scene
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_ = coordinator.present(scene: .welcome, from: self, transition: .modal(animated: true, completion: nil))
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}
}
}