86 lines
3.2 KiB
Swift
86 lines
3.2 KiB
Swift
//
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// ReportViewModel+Diffable.swift
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// Mastodon
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//
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// Created by ihugo on 2021/4/19.
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//
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import UIKit
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import Combine
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import CoreData
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import CoreDataStack
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import MastodonAsset
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import MastodonLocalization
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extension ReportStatusViewModel {
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static let reportItemHeaderContext = ReportItem.HeaderContext(
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primaryLabelText: L10n.Scene.Report.content1,
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secondaryLabelText: L10n.Scene.Report.StepThree.step3Of4
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)
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func setupDiffableDataSource(
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tableView: UITableView
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) {
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diffableDataSource = ReportSection.diffableDataSource(
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tableView: tableView,
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context: context,
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configuration: ReportSection.Configuration(authContext: authContext)
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)
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var snapshot = NSDiffableDataSourceSnapshot<ReportSection, ReportItem>()
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snapshot.appendSections([.main])
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diffableDataSource?.apply(snapshot)
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statusFetchedResultsController.$records
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.receive(on: DispatchQueue.main)
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.sink { [weak self] records in
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guard let self = self else { return }
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guard let diffableDataSource = self.diffableDataSource else { return }
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var snapshot = NSDiffableDataSourceSnapshot<ReportSection, ReportItem>()
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snapshot.appendSections([.main])
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snapshot.appendItems([.header(context: ReportStatusViewModel.reportItemHeaderContext)], toSection: .main)
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let items = records.map { ReportItem.status(record: $0) }
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snapshot.appendItems(items, toSection: .main)
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let selectItems = items.filter { item in
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guard case let .status(record) = item else { return false }
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return self.selectStatuses.contains(record)
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}
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guard let currentState = self.stateMachine.currentState else { return }
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switch currentState {
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case is State.Initial,
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is State.Loading,
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is State.Idle,
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is State.Fail:
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snapshot.appendItems([.bottomLoader], toSection: .main)
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case is State.NoMore:
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break
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default:
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assertionFailure()
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break
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}
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diffableDataSource.applySnapshot(snapshot, animated: false) { [weak self] in
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guard let self = self else { return }
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guard let diffableDataSource = self.diffableDataSource else { return }
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let selectIndexPaths = selectItems.compactMap { item in
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diffableDataSource.indexPath(for: item)
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}
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// Only the first selection make the initial selection
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// The later selection could be ignored
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for indexPath in selectIndexPaths {
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tableView.selectRow(at: indexPath, animated: false, scrollPosition: .none)
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}
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}
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}
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.store(in: &disposeBag)
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}
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}
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