mastodon-ios/Mastodon/Scene/HomeTimeline/HomeTimelineViewController+...

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//
// HomeTimelineViewController+Provider.swift
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// Mastodon
//
// Created by sxiaojian on 2021/2/5.
//
import os.log
import UIKit
import Combine
import CoreData
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import CoreDataStack
// MARK: - StatusProvider
extension HomeTimelineViewController: StatusProvider {
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func status() -> Future<Status?, Never> {
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return Future { promise in promise(.success(nil)) }
}
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func status(for cell: UITableViewCell?, indexPath: IndexPath?) -> Future<Status?, Never> {
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return Future { promise in
guard let diffableDataSource = self.viewModel.diffableDataSource else {
assertionFailure()
promise(.success(nil))
return
}
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guard let indexPath = indexPath ?? cell.flatMap({ self.tableView.indexPath(for: $0) }),
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let item = diffableDataSource.itemIdentifier(for: indexPath) else {
promise(.success(nil))
return
}
switch item {
case .homeTimelineIndex(let objectID, _):
let managedObjectContext = self.viewModel.fetchedResultsController.managedObjectContext
managedObjectContext.perform {
let timelineIndex = managedObjectContext.object(with: objectID) as? HomeTimelineIndex
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promise(.success(timelineIndex?.status))
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}
default:
promise(.success(nil))
}
}
}
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func status(for cell: UICollectionViewCell) -> Future<Status?, Never> {
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return Future { promise in promise(.success(nil)) }
}
var managedObjectContext: NSManagedObjectContext {
return viewModel.fetchedResultsController.managedObjectContext
}
var tableViewDiffableDataSource: UITableViewDiffableDataSource<StatusSection, Item>? {
return viewModel.diffableDataSource
}
func item(for cell: UITableViewCell?, indexPath: IndexPath?) -> Item? {
guard let diffableDataSource = self.viewModel.diffableDataSource else {
assertionFailure()
return nil
}
guard let indexPath = indexPath ?? cell.flatMap({ self.tableView.indexPath(for: $0) }),
let item = diffableDataSource.itemIdentifier(for: indexPath) else {
return nil
}
return item
}
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func items(indexPaths: [IndexPath]) -> [Item] {
guard let diffableDataSource = self.viewModel.diffableDataSource else {
assertionFailure()
return []
}
var items: [Item] = []
for indexPath in indexPaths {
guard let item = diffableDataSource.itemIdentifier(for: indexPath) else { continue }
items.append(item)
}
return items
}
func statusObjectItems(indexPaths: [IndexPath]) -> [StatusObjectItem] {
guard let diffableDataSource = self.viewModel.diffableDataSource else { return [] }
let items = indexPaths.compactMap { diffableDataSource.itemIdentifier(for: $0)?.statusObjectItem }
return items
}
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}
extension HomeTimelineViewController: UserProvider {}