forked from shadowfacts/Tusker
Convert TimelineTableViewController to use DiffableTimelineLikeTableViewController
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49572c1fec
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@ -58,7 +58,7 @@ class ListTimelineViewController: TimelineTableViewController {
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dismiss(animated: true)
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// todo: show loading indicator
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reloadInitialItems()
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reloadInitial()
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}
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}
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@ -11,7 +11,7 @@ import Pachyderm
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typealias TimelineEntry = (id: String, state: StatusState)
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class TimelineTableViewController: TimelineLikeTableViewController<TimelineEntry> {
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class TimelineTableViewController: DiffableTimelineLikeTableViewController<TimelineTableViewController.Section, TimelineTableViewController.Item> {
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let timeline: Timeline
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weak var mastodonController: MastodonController!
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@ -44,10 +44,8 @@ class TimelineTableViewController: TimelineLikeTableViewController<TimelineEntry
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// decrement reference counts of any statuses we still have
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// if the app is currently being quit, this will not affect the persisted data because
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// the persistent container would already have been saved in SceneDelegate.sceneDidEnterBackground(_:)
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for section in sections {
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for (id, _) in section {
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persistentContainer.status(for: id)?.decrementReferenceCount()
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}
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for case let .status(id: id, state: _) in dataSource.snapshot().itemIdentifiers {
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persistentContainer.status(for: id)?.decrementReferenceCount()
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}
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}
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@ -57,96 +55,125 @@ class TimelineTableViewController: TimelineLikeTableViewController<TimelineEntry
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tableView.register(UINib(nibName: "TimelineStatusTableViewCell", bundle: .main), forCellReuseIdentifier: "statusCell")
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}
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// MARK: - DiffableTimelineLikeTableViewController
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override class func refreshCommandTitle() -> String {
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return NSLocalizedString("Refresh Statuses", comment: "refresh status command discoverability title")
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}
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override func willRemoveRows(at indexPaths: [IndexPath]) {
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for indexPath in indexPaths {
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let id = item(for: indexPath).id
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mastodonController.persistentContainer.status(for: id)?.decrementReferenceCount()
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}
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}
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override func loadInitialItems(completion: @escaping ([TimelineEntry]) -> Void) {
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let request = Client.getStatuses(timeline: timeline)
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mastodonController?.run(request) { (response) in
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guard case let .success(statuses, pagination) = response else {
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completion([])
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return
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}
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self.newer = pagination?.newer
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self.older = pagination?.older
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self.mastodonController?.persistentContainer.addAll(statuses: statuses) {
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completion(statuses.map { ($0.id, .unknown) })
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}
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}
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}
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override func loadOlder(completion: @escaping ([TimelineEntry]) -> Void) {
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guard let older = older else {
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completion([])
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return
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override func cellProvider(_ tableView: UITableView, _ indexPath: IndexPath, _ item: Item) -> UITableViewCell? {
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guard case let .status(id: id, state: state) = item,
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let cell = tableView.dequeueReusableCell(withIdentifier: "statusCell", for: indexPath) as? TimelineStatusTableViewCell else {
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return nil
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}
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let request = Client.getStatuses(timeline: timeline, range: older)
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mastodonController.run(request) { (response) in
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guard case let .success(statuses, pagination) = response else {
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completion([])
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return
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}
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self.older = pagination?.older
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self.mastodonController?.persistentContainer.addAll(statuses: statuses) {
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completion(statuses.map { ($0.id, .unknown) })
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}
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}
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}
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override func loadNewer(completion: @escaping ([TimelineEntry]) -> Void) {
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guard let newer = newer else {
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completion([])
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return
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}
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let request = Client.getStatuses(timeline: timeline, range: newer)
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mastodonController.run(request) { (response) in
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guard case let .success(statuses, pagination) = response else {
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completion([])
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return
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}
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// if there are no new statuses, pagination is nil
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// if we were to then overwrite self.newer, future refreshes would fail
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if let newer = pagination?.newer {
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self.newer = newer
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}
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self.mastodonController?.persistentContainer.addAll(statuses: statuses) {
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completion(statuses.map { ($0.id, .unknown) })
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}
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}
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}
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// MARK: - UITableViewDataSource
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override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
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guard let cell = tableView.dequeueReusableCell(withIdentifier: "statusCell", for: indexPath) as? TimelineStatusTableViewCell else { fatalError() }
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let (id, state) = item(for: indexPath)
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cell.delegate = self
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cell.updateUI(statusID: id, state: state)
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return cell
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}
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override func loadInitialItems(completion: @escaping (LoadResult) -> Void) {
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guard let mastodonController = mastodonController else {
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completion(.failure(.noClient))
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return
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}
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let request = Client.getStatuses(timeline: timeline)
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mastodonController.run(request) { response in
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switch response {
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case let .failure(error):
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completion(.failure(.client(error)))
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case let .success(statuses, pagination):
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self.newer = pagination?.newer
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self.older = pagination?.older
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self.mastodonController.persistentContainer.addAll(statuses: statuses) {
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var snapshot = Snapshot()
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snapshot.appendSections([.statuses])
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snapshot.appendItems(statuses.map { .status(id: $0.id, state: .unknown) })
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completion(.success(snapshot))
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}
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}
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}
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}
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override func loadOlderItems(currentSnapshot: Snapshot, completion: @escaping (LoadResult) -> Void) {
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guard let older = older else {
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completion(.failure(.noOlder))
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return
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}
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let request = Client.getStatuses(timeline: timeline, range: older)
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mastodonController.run(request) { response in
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switch response {
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case let .failure(error):
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completion(.failure(.client(error)))
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case let .success(statuses, pagination):
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self.older = pagination?.older
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self.mastodonController.persistentContainer.addAll(statuses: statuses) {
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var snapshot = currentSnapshot
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snapshot.appendItems(statuses.map { .status(id: $0.id, state: .unknown) }, toSection: .statuses)
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completion(.success(snapshot))
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}
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}
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}
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}
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override func loadNewerItems(currentSnapshot: Snapshot, completion: @escaping (LoadResult) -> Void) {
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guard let newer = newer else {
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completion(.failure(.noNewer))
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return
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}
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let request = Client.getStatuses(timeline: timeline, range: newer)
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mastodonController.run(request) { response in
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switch response {
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case let .failure(error):
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completion(.failure(.client(error)))
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case let .success(statuses, pagination):
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// if there are no new statuses, pagination is nil
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// if we were to then overwrite self.newer, future refresh would fail
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if let newer = pagination?.newer {
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self.newer = newer
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}
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self.mastodonController.persistentContainer.addAll(statuses: statuses) {
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var snapshot = currentSnapshot
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let identifiers = statuses.map { Item.status(id: $0.id, state: .unknown) }
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if let first = snapshot.itemIdentifiers(inSection: .statuses).first {
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snapshot.insertItems(identifiers, beforeItem: first)
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} else {
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snapshot.appendItems(identifiers, toSection: .statuses)
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}
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completion(.success(snapshot))
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}
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}
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}
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}
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override func willRemoveItems(_ items: [Item]) {
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for case let .status(id: id, state: _) in items {
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mastodonController.persistentContainer.status(for: id)?.decrementReferenceCount()
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}
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}
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}
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extension TimelineTableViewController {
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enum Section: Hashable, CaseIterable {
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case statuses
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case footer
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}
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enum Item: Hashable {
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case status(id: String, state: StatusState)
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}
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}
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extension TimelineTableViewController: TuskerNavigationDelegate {
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@ -161,17 +188,23 @@ extension TimelineTableViewController: StatusTableViewCellDelegate {
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extension TimelineTableViewController: UITableViewDataSourcePrefetching, StatusTablePrefetching {
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func tableView(_ tableView: UITableView, prefetchRowsAt indexPaths: [IndexPath]) {
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let ids = indexPaths.map { item(for: $0).id }
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let ids: [String] = indexPaths.compactMap {
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if case let .status(id: id, state: _) = dataSource.itemIdentifier(for: $0) {
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return id
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} else {
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return nil
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}
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}
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prefetchStatuses(with: ids)
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}
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func tableView(_ tableView: UITableView, cancelPrefetchingForRowsAt indexPaths: [IndexPath]) {
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let ids: [String] = indexPaths.compactMap {
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guard $0.section < sections.count,
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$0.row < sections[$0.section].count else {
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if case let .status(id: id, state: _) = dataSource.itemIdentifier(for: $0) {
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return id
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} else {
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return nil
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}
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return item(for: $0).id
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}
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cancelPrefetchingStatuses(with: ids)
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}
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