637 lines
25 KiB
Swift
637 lines
25 KiB
Swift
// Copyright © 2022 Rangeproof Pty Ltd. All rights reserved.
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import UIKit
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import Combine
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import GRDB
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import DifferenceKit
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import SessionUIKit
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import SessionUtilitiesKit
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import SignalUtilitiesKit
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protocol SessionViewModelAccessible {
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var viewModelType: AnyObject.Type { get }
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}
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class SessionTableViewController<NavItemId: Equatable, Section: SessionTableSection, SettingItem: Hashable & Differentiable>: BaseVC, UITableViewDataSource, UITableViewDelegate, SessionViewModelAccessible {
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typealias SectionModel = SessionTableViewModel<NavItemId, Section, SettingItem>.SectionModel
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private let viewModel: SessionTableViewModel<NavItemId, Section, SettingItem>
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private var hasLoadedInitialTableData: Bool = false
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private var isLoadingMore: Bool = false
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private var isAutoLoadingNextPage: Bool = false
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private var viewHasAppeared: Bool = false
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private var dataStreamJustFailed: Bool = false
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private var dataChangeCancellable: AnyCancellable?
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private var disposables: Set<AnyCancellable> = Set()
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private var onFooterTap: (() -> ())?
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public var viewModelType: AnyObject.Type { return type(of: viewModel) }
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// MARK: - Components
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private lazy var tableView: UITableView = {
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let result: UITableView = UITableView()
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result.translatesAutoresizingMaskIntoConstraints = false
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result.separatorStyle = .none
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result.themeBackgroundColor = .clear
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result.showsVerticalScrollIndicator = false
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result.showsHorizontalScrollIndicator = false
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result.register(view: SessionCell.self)
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result.registerHeaderFooterView(view: SessionHeaderView.self)
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result.dataSource = self
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result.delegate = self
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if #available(iOS 15.0, *) {
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result.sectionHeaderTopPadding = 0
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}
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return result
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}()
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private lazy var emptyStateLabel: UILabel = {
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let result: UILabel = UILabel()
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result.translatesAutoresizingMaskIntoConstraints = false
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result.isUserInteractionEnabled = false
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result.font = .systemFont(ofSize: Values.smallFontSize)
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result.themeTextColor = .textSecondary
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result.textAlignment = .center
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result.numberOfLines = 0
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result.isHidden = true
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return result
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}()
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private lazy var fadeView: GradientView = {
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let result: GradientView = GradientView()
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result.themeBackgroundGradient = [
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.value(.backgroundPrimary, alpha: 0), // Want this to take up 20% (~25pt)
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.backgroundPrimary,
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.backgroundPrimary,
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.backgroundPrimary,
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.backgroundPrimary
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]
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result.set(.height, to: Values.footerGradientHeight(window: UIApplication.shared.keyWindow))
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result.isHidden = true
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return result
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}()
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private lazy var footerButton: SessionButton = {
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let result: SessionButton = SessionButton(style: .bordered, size: .medium)
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result.translatesAutoresizingMaskIntoConstraints = false
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result.addTarget(self, action: #selector(footerButtonTapped), for: .touchUpInside)
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result.isHidden = true
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return result
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}()
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// MARK: - Initialization
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init(viewModel: SessionTableViewModel<NavItemId, Section, SettingItem>) {
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self.viewModel = viewModel
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Storage.shared.addObserver(viewModel.pagedDataObserver)
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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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deinit {
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NotificationCenter.default.removeObserver(self)
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}
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// MARK: - Lifecycle
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override func viewDidLoad() {
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super.viewDidLoad()
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ViewControllerUtilities.setUpDefaultSessionStyle(
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for: self,
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title: viewModel.title,
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hasCustomBackButton: false
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)
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view.themeBackgroundColor = .backgroundPrimary
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view.addSubview(tableView)
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view.addSubview(emptyStateLabel)
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view.addSubview(fadeView)
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view.addSubview(footerButton)
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setupLayout()
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setupBinding()
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// Notifications
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NotificationCenter.default.addObserver(
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self,
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selector: #selector(applicationDidBecomeActive(_:)),
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name: UIApplication.didBecomeActiveNotification,
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object: nil
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)
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NotificationCenter.default.addObserver(
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self,
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selector: #selector(applicationDidResignActive(_:)),
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name: UIApplication.didEnterBackgroundNotification, object: nil
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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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startObservingChanges()
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}
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override func viewDidAppear(_ animated: Bool) {
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super.viewDidAppear(animated)
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viewHasAppeared = true
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autoLoadNextPageIfNeeded()
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}
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override func viewWillDisappear(_ animated: Bool) {
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super.viewWillDisappear(animated)
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stopObservingChanges()
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}
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@objc func applicationDidBecomeActive(_ notification: Notification) {
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/// Need to dispatch to the next run loop to prevent a possible crash caused by the database resuming mid-query
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DispatchQueue.main.async { [weak self] in
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self?.startObservingChanges()
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}
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}
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@objc func applicationDidResignActive(_ notification: Notification) {
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stopObservingChanges()
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}
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private func setupLayout() {
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tableView.pin(to: view)
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emptyStateLabel.pin(.top, to: .top, of: self.view, withInset: Values.massiveSpacing)
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emptyStateLabel.pin(.leading, to: .leading, of: self.view, withInset: Values.mediumSpacing)
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emptyStateLabel.pin(.trailing, to: .trailing, of: self.view, withInset: -Values.mediumSpacing)
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fadeView.pin(.leading, to: .leading, of: self.view)
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fadeView.pin(.trailing, to: .trailing, of: self.view)
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fadeView.pin(.bottom, to: .bottom, of: self.view)
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footerButton.center(.horizontal, in: self.view)
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footerButton.pin(.bottom, to: .bottom, of: self.view.safeAreaLayoutGuide, withInset: -Values.smallSpacing)
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}
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// MARK: - Updating
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private func startObservingChanges() {
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// Start observing for data changes
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dataChangeCancellable = viewModel.observableTableData
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.receive(
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on: DispatchQueue.main,
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// If we haven't done the initial load the trigger it immediately (blocking the main
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// thread so we remain on the launch screen until it completes to be consistent with
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// the old behaviour)
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immediatelyIfMain: !hasLoadedInitialTableData
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)
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.sink(
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receiveCompletion: { [weak self] result in
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switch result {
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case .failure(let error):
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let title: String = (self?.viewModel.title ?? "unknown")
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// If we got an error then try to restart the stream once, otherwise log the error
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guard self?.dataStreamJustFailed == false else {
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SNLog("Unable to recover database stream in '\(title)' settings with error: \(error)")
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return
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}
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SNLog("Atempting recovery for database stream in '\(title)' settings with error: \(error)")
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self?.dataStreamJustFailed = true
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self?.startObservingChanges()
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case .finished: break
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}
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},
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receiveValue: { [weak self] updatedData, changeset in
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self?.dataStreamJustFailed = false
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self?.handleDataUpdates(updatedData, changeset: changeset)
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}
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)
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}
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private func stopObservingChanges() {
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// Stop observing database changes
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dataChangeCancellable?.cancel()
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}
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private func handleDataUpdates(
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_ updatedData: [SectionModel],
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changeset: StagedChangeset<[SectionModel]>,
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initialLoad: Bool = false
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) {
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// Ensure the first load runs without animations (if we don't do this the cells will animate
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// in from a frame of CGRect.zero)
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guard hasLoadedInitialTableData else {
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hasLoadedInitialTableData = true
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UIView.performWithoutAnimation {
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handleDataUpdates(updatedData, changeset: changeset, initialLoad: true)
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}
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return
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}
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// Show the empty state if there is no data
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let itemCount: Int = updatedData
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.map { $0.elements.count }
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.reduce(0, +)
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emptyStateLabel.isHidden = (itemCount > 0)
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CATransaction.begin()
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CATransaction.setCompletionBlock { [weak self] in
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// Complete page loading
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self?.isLoadingMore = false
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self?.autoLoadNextPageIfNeeded()
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}
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// Reload the table content (animate changes after the first load)
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tableView.reload(
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using: changeset,
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deleteSectionsAnimation: .none,
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insertSectionsAnimation: .none,
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reloadSectionsAnimation: .none,
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deleteRowsAnimation: .fade,
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insertRowsAnimation: .fade,
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reloadRowsAnimation: .fade,
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interrupt: { $0.changeCount > 100 } // Prevent too many changes from causing performance issues
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) { [weak self] updatedData in
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self?.viewModel.updateTableData(updatedData)
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}
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CATransaction.commit()
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}
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private func autoLoadNextPageIfNeeded() {
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guard !self.isAutoLoadingNextPage && !self.isLoadingMore else { return }
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self.isAutoLoadingNextPage = true
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DispatchQueue.main.asyncAfter(deadline: .now() + PagedData.autoLoadNextPageDelay) { [weak self] in
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self?.isAutoLoadingNextPage = false
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// Note: We sort the headers as we want to prioritise loading newer pages over older ones
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let sections: [(Section, CGRect)] = (self?.viewModel.tableData
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.enumerated()
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.map { index, section in
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(section.model, (self?.tableView.rectForHeader(inSection: index) ?? .zero))
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})
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.defaulting(to: [])
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let shouldLoadMore: Bool = sections
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.contains { section, headerRect in
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section.style == .loadMore &&
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headerRect != .zero &&
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(self?.tableView.bounds.contains(headerRect) == true)
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}
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guard shouldLoadMore else { return }
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self?.isLoadingMore = true
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DispatchQueue.global(qos: .userInitiated).async { [weak self] in
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self?.viewModel.loadPageAfter()
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}
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}
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}
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// MARK: - Binding
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private func setupBinding() {
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viewModel.isEditing
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.receive(on: DispatchQueue.main)
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.sink { [weak self] isEditing in
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UIView.animate(withDuration: 0.25) {
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self?.setEditing(isEditing, animated: true)
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self?.tableView.visibleCells
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.compactMap { $0 as? SessionCell }
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.filter { $0.interactionMode == .editable || $0.interactionMode == .alwaysEditing }
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.enumerated()
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.forEach { index, cell in
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cell.update(
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isEditing: (isEditing || cell.interactionMode == .alwaysEditing),
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becomeFirstResponder: (
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isEditing &&
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index == 0 &&
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cell.interactionMode != .alwaysEditing
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),
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animated: true
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)
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}
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self?.tableView.beginUpdates()
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self?.tableView.endUpdates()
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}
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}
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.store(in: &disposables)
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viewModel.leftNavItems
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.receive(on: DispatchQueue.main, immediatelyIfMain: true)
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.sink { [weak self] maybeItems in
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self?.navigationItem.setLeftBarButtonItems(
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maybeItems.map { items in
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items.map { item -> DisposableBarButtonItem in
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let buttonItem: DisposableBarButtonItem = item.createBarButtonItem()
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buttonItem.themeTintColor = .textPrimary
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buttonItem.tapPublisher
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.map { _ in item.id }
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.sink(receiveValue: { _ in item.action?() })
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.store(in: &buttonItem.disposables)
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return buttonItem
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}
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},
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animated: true
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)
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}
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.store(in: &disposables)
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viewModel.rightNavItems
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.receive(on: DispatchQueue.main, immediatelyIfMain: true)
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.sink { [weak self] maybeItems in
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self?.navigationItem.setRightBarButtonItems(
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maybeItems.map { items in
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items.map { item -> DisposableBarButtonItem in
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let buttonItem: DisposableBarButtonItem = item.createBarButtonItem()
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buttonItem.themeTintColor = .textPrimary
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buttonItem.tapPublisher
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.map { _ in item.id }
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.sink(receiveValue: { _ in item.action?() })
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.store(in: &buttonItem.disposables)
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return buttonItem
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}
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},
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animated: true
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)
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}
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.store(in: &disposables)
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viewModel.emptyStateTextPublisher
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.receive(on: DispatchQueue.main, immediatelyIfMain: true)
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.sink { [weak self] text in
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self?.emptyStateLabel.text = text
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}
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.store(in: &disposables)
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viewModel.footerView
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.receive(on: DispatchQueue.main, immediatelyIfMain: true)
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.sink { [weak self] footerView in
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self?.tableView.tableFooterView = footerView
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}
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.store(in: &disposables)
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viewModel.footerButtonInfo
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.receive(on: DispatchQueue.main, immediatelyIfMain: true)
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.sink { [weak self] buttonInfo in
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if let buttonInfo: SessionButton.Info = buttonInfo {
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self?.footerButton.setTitle(buttonInfo.title, for: .normal)
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self?.footerButton.setStyle(buttonInfo.style)
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self?.footerButton.isEnabled = buttonInfo.isEnabled
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}
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self?.onFooterTap = buttonInfo?.onTap
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self?.fadeView.isHidden = (buttonInfo == nil)
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self?.footerButton.isHidden = (buttonInfo == nil)
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// If we have a footerButton then we want to manually control the contentInset
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self?.tableView.contentInsetAdjustmentBehavior = (buttonInfo == nil ? .automatic : .never)
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self?.tableView.contentInset = UIEdgeInsets(
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top: 0,
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left: 0,
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bottom: (buttonInfo == nil ?
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0 :
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Values.footerGradientHeight(window: UIApplication.shared.keyWindow)
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),
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right: 0
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)
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}
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.store(in: &disposables)
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viewModel.showToast
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.receive(on: DispatchQueue.main)
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.sink { [weak self] text, color in
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guard let view: UIView = self?.view else { return }
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let toastController: ToastController = ToastController(text: text, background: color)
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toastController.presentToastView(fromBottomOfView: view, inset: Values.largeSpacing)
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}
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.store(in: &disposables)
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viewModel.transitionToScreen
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.receive(on: DispatchQueue.main)
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.sink { [weak self] viewController, transitionType in
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switch transitionType {
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case .push:
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self?.navigationController?.pushViewController(viewController, animated: true)
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case .present:
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let presenter: UIViewController? = (self?.presentedViewController ?? self)
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if UIDevice.current.isIPad {
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viewController.popoverPresentationController?.permittedArrowDirections = []
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viewController.popoverPresentationController?.sourceView = presenter?.view
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viewController.popoverPresentationController?.sourceRect = (presenter?.view.bounds ?? UIScreen.main.bounds)
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}
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presenter?.present(viewController, animated: true)
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}
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}
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.store(in: &disposables)
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viewModel.dismissScreen
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.receive(on: DispatchQueue.main)
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.sink { [weak self] dismissType in
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switch dismissType {
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case .auto:
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guard
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let viewController: UIViewController = self,
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(self?.navigationController?.viewControllers
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.firstIndex(of: viewController))
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.defaulting(to: 0) > 0
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else {
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self?.dismiss(animated: true)
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return
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}
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self?.navigationController?.popViewController(animated: true)
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case .dismiss: self?.dismiss(animated: true)
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case .pop: self?.navigationController?.popViewController(animated: true)
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case .popToRoot: self?.navigationController?.popToRootViewController(animated: true)
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}
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}
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.store(in: &disposables)
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}
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@objc private func footerButtonTapped() {
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onFooterTap?()
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}
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// MARK: - UITableViewDataSource
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func numberOfSections(in tableView: UITableView) -> Int {
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return self.viewModel.tableData.count
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}
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func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
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return self.viewModel.tableData[section].elements.count
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}
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func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
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let section: SectionModel = viewModel.tableData[indexPath.section]
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let info: SessionCell.Info<SettingItem> = section.elements[indexPath.row]
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let cell: SessionCell = tableView.dequeue(type: SessionCell.self, for: indexPath)
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cell.update(with: info)
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cell.update(
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isEditing: (self.isEditing || (info.title?.interaction == .alwaysEditing)),
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becomeFirstResponder: false,
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animated: false
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)
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cell.textPublisher
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.sink(receiveValue: { [weak self] text in
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self?.viewModel.textChanged(text, for: info.id)
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})
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.store(in: &cell.disposables)
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return cell
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}
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func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
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let section: SectionModel = viewModel.tableData[section]
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let result: SessionHeaderView = tableView.dequeueHeaderFooterView(type: SessionHeaderView.self)
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result.update(
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title: section.model.title,
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style: section.model.style
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)
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return result
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}
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// MARK: - UITableViewDelegate
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func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
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return viewModel.tableData[section].model.style.height
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}
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func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
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return UITableView.automaticDimension
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}
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func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
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return UITableView.automaticDimension
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}
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func tableView(_ tableView: UITableView, willDisplayHeaderView view: UIView, forSection section: Int) {
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guard self.hasLoadedInitialTableData && self.viewHasAppeared && !self.isLoadingMore else { return }
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let section: SectionModel = self.viewModel.tableData[section]
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|
|
switch section.model.style {
|
|
case .loadMore:
|
|
self.isLoadingMore = true
|
|
|
|
DispatchQueue.global(qos: .userInitiated).async { [weak self] in
|
|
self?.viewModel.loadPageAfter()
|
|
}
|
|
|
|
default: break
|
|
}
|
|
}
|
|
|
|
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
|
|
tableView.deselectRow(at: indexPath, animated: true)
|
|
|
|
let section: SectionModel = self.viewModel.tableData[indexPath.section]
|
|
let info: SessionCell.Info<SettingItem> = section.elements[indexPath.row]
|
|
|
|
// Do nothing if the item is disabled
|
|
guard info.isEnabled else { return }
|
|
|
|
// Get the view that was tapped (for presenting on iPad)
|
|
let tappedView: UIView? = {
|
|
guard let cell: SessionCell = tableView.cellForRow(at: indexPath) as? SessionCell else {
|
|
return nil
|
|
}
|
|
|
|
switch (info.leftAccessory, info.rightAccessory) {
|
|
case (_, .highlightingBackgroundLabel(_, _)):
|
|
return (!cell.rightAccessoryView.isHidden ? cell.rightAccessoryView : cell)
|
|
|
|
case (.highlightingBackgroundLabel(_, _), _):
|
|
return (!cell.leftAccessoryView.isHidden ? cell.leftAccessoryView : cell)
|
|
|
|
default:
|
|
return cell
|
|
}
|
|
}()
|
|
let maybeOldSelection: (Int, SessionCell.Info<SettingItem>)? = section.elements
|
|
.enumerated()
|
|
.first(where: { index, info in
|
|
switch (info.leftAccessory, info.rightAccessory) {
|
|
case (_, .radio(_, let isSelected, _, _)): return isSelected()
|
|
case (.radio(_, let isSelected, _, _), _): return isSelected()
|
|
default: return false
|
|
}
|
|
})
|
|
|
|
let performAction: () -> Void = { [weak self, weak tappedView] in
|
|
info.onTap?()
|
|
info.onTapView?(tappedView)
|
|
self?.manuallyReload(indexPath: indexPath, section: section, info: info)
|
|
|
|
// Update the old selection as well
|
|
if let oldSelection: (index: Int, info: SessionCell.Info<SettingItem>) = maybeOldSelection {
|
|
self?.manuallyReload(
|
|
indexPath: IndexPath(
|
|
row: oldSelection.index,
|
|
section: indexPath.section
|
|
),
|
|
section: section,
|
|
info: oldSelection.info
|
|
)
|
|
}
|
|
}
|
|
|
|
guard
|
|
let confirmationInfo: ConfirmationModal.Info = info.confirmationInfo,
|
|
confirmationInfo.showCondition.shouldShow(for: info.currentBoolValue)
|
|
else {
|
|
performAction()
|
|
return
|
|
}
|
|
|
|
// Show a confirmation modal before continuing
|
|
let confirmationModal: ConfirmationModal = ConfirmationModal(
|
|
targetView: tappedView,
|
|
info: confirmationInfo
|
|
.with(onConfirm: { _ in performAction() })
|
|
)
|
|
present(confirmationModal, animated: true, completion: nil)
|
|
}
|
|
|
|
private func manuallyReload(
|
|
indexPath: IndexPath,
|
|
section: SectionModel,
|
|
info: SessionCell.Info<SettingItem>
|
|
) {
|
|
// Try update the existing cell to have a nice animation instead of reloading the cell
|
|
if let existingCell: SessionCell = tableView.cellForRow(at: indexPath) as? SessionCell {
|
|
existingCell.update(with: info)
|
|
}
|
|
else {
|
|
tableView.reloadRows(at: [indexPath], with: .none)
|
|
}
|
|
}
|
|
}
|