Extract common functionality into TimelineLikeTableViewController

This commit is contained in:
Shadowfacts 2020-11-15 15:48:49 -05:00
parent b45dc19811
commit dfad8740eb
Signed by untrusted user: shadowfacts
GPG Key ID: 94A5AB95422746E5
6 changed files with 535 additions and 594 deletions

View File

@ -116,16 +116,15 @@
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@ -1865,7 +1869,6 @@
D6F953F021251A2900CF0F2B /* MastodonController.swift in Sources */, D6F953F021251A2900CF0F2B /* MastodonController.swift in Sources */,
0411610022B442870030A9B7 /* LoadingLargeImageViewController.swift in Sources */, 0411610022B442870030A9B7 /* LoadingLargeImageViewController.swift in Sources */,
D6A4DCE525537C7A00D9DE31 /* FastSwitchingAccountView.swift in Sources */, D6A4DCE525537C7A00D9DE31 /* FastSwitchingAccountView.swift in Sources */,
D6412B0724B0237700F5412E /* ProfileStatusesViewController.swift in Sources */,
D6A4DCCC2553667800D9DE31 /* FastAccountSwitcherViewController.swift in Sources */, D6A4DCCC2553667800D9DE31 /* FastAccountSwitcherViewController.swift in Sources */,
D611C2CF232DC61100C86A49 /* HashtagTableViewCell.swift in Sources */, D611C2CF232DC61100C86A49 /* HashtagTableViewCell.swift in Sources */,
D627944F23A9C99800D38C68 /* EditListAccountsViewController.swift in Sources */, D627944F23A9C99800D38C68 /* EditListAccountsViewController.swift in Sources */,
@ -1887,6 +1890,7 @@
D6CA6A92249FAD8900AD45C1 /* AudioSessionHelper.swift in Sources */, D6CA6A92249FAD8900AD45C1 /* AudioSessionHelper.swift in Sources */,
D6C143FD25354FD0007DC240 /* EmojiCollectionViewCell.swift in Sources */, D6C143FD25354FD0007DC240 /* EmojiCollectionViewCell.swift in Sources */,
D60D2B8223844C71001B87A3 /* BaseStatusTableViewCell.swift in Sources */, D60D2B8223844C71001B87A3 /* BaseStatusTableViewCell.swift in Sources */,
D63A8D0B2561C27F00D9DFFF /* ProfileStatusesViewController.swift in Sources */,
D60E2F272442372B005F8713 /* StatusMO.swift in Sources */, D60E2F272442372B005F8713 /* StatusMO.swift in Sources */,
D60E2F2C24423EAD005F8713 /* LazilyDecoding.swift in Sources */, D60E2F2C24423EAD005F8713 /* LazilyDecoding.swift in Sources */,
D677284A24ECBDF400C732D3 /* ComposeCurrentAccount.swift in Sources */, D677284A24ECBDF400C732D3 /* ComposeCurrentAccount.swift in Sources */,
@ -1988,6 +1992,7 @@
D6FF9860255C717400845181 /* AccountSwitchingContainerViewController.swift in Sources */, D6FF9860255C717400845181 /* AccountSwitchingContainerViewController.swift in Sources */,
D670F8B62537DC890046588A /* EmojiPickerWrapper.swift in Sources */, D670F8B62537DC890046588A /* EmojiPickerWrapper.swift in Sources */,
D6B81F442560390300F6E31D /* MenuController.swift in Sources */, D6B81F442560390300F6E31D /* MenuController.swift in Sources */,
D65234E12561AA68001AF9CF /* NotificationsTableViewController.swift in Sources */,
D67C57AF21E28EAD00C3118B /* Array+Uniques.swift in Sources */, D67C57AF21E28EAD00C3118B /* Array+Uniques.swift in Sources */,
D6945C3223AC4D36005C403C /* HashtagTimelineViewController.swift in Sources */, D6945C3223AC4D36005C403C /* HashtagTimelineViewController.swift in Sources */,
D647D92824257BEB0005044F /* AttachmentPreviewViewController.swift in Sources */, D647D92824257BEB0005044F /* AttachmentPreviewViewController.swift in Sources */,
@ -1997,7 +2002,6 @@
D681E4D7246E32290053414F /* StatusActivityItemSource.swift in Sources */, D681E4D7246E32290053414F /* StatusActivityItemSource.swift in Sources */,
D646C95A213B5D0500269FB5 /* LargeImageInteractionController.swift in Sources */, D646C95A213B5D0500269FB5 /* LargeImageInteractionController.swift in Sources */,
D6A3BC7C232195C600FD64D5 /* ActionNotificationGroupTableViewCell.swift in Sources */, D6A3BC7C232195C600FD64D5 /* ActionNotificationGroupTableViewCell.swift in Sources */,
D6F953EC212519E700CF0F2B /* TimelineTableViewController.swift in Sources */,
D62275A824F1CA2800B82A16 /* ComposeReplyContentView.swift in Sources */, D62275A824F1CA2800B82A16 /* ComposeReplyContentView.swift in Sources */,
D677284824ECBCB100C732D3 /* ComposeView.swift in Sources */, D677284824ECBCB100C732D3 /* ComposeView.swift in Sources */,
D68232F72464F4FD00325FB8 /* ComposeDrawingViewController.swift in Sources */, D68232F72464F4FD00325FB8 /* ComposeDrawingViewController.swift in Sources */,
@ -2007,12 +2011,12 @@
D68015402401A6BA00D6103B /* ComposingPrefsView.swift in Sources */, D68015402401A6BA00D6103B /* ComposingPrefsView.swift in Sources */,
D67895BC24671E6D00D4CD9E /* PKDrawing+Render.swift in Sources */, D67895BC24671E6D00D4CD9E /* PKDrawing+Render.swift in Sources */,
04D14BB022B34A2800642648 /* GalleryViewController.swift in Sources */, 04D14BB022B34A2800642648 /* GalleryViewController.swift in Sources */,
D641C773213CAA25004B4513 /* NotificationsTableViewController.swift in Sources */,
D6C1B2082545D1EC00DAAA66 /* StatusCardView.swift in Sources */, D6C1B2082545D1EC00DAAA66 /* StatusCardView.swift in Sources */,
D6412B0524B0227D00F5412E /* ProfileViewController.swift in Sources */, D6412B0524B0227D00F5412E /* ProfileViewController.swift in Sources */,
D64BC18A23C16487000D0238 /* UnpinStatusActivity.swift in Sources */, D64BC18A23C16487000D0238 /* UnpinStatusActivity.swift in Sources */,
D64D8CA92463B494006B0BAA /* MultiThreadDictionary.swift in Sources */, D64D8CA92463B494006B0BAA /* MultiThreadDictionary.swift in Sources */,
D6757A7C2157E01900721E32 /* XCBManager.swift in Sources */, D6757A7C2157E01900721E32 /* XCBManager.swift in Sources */,
D65234D325618EFA001AF9CF /* TimelineTableViewController.swift in Sources */,
D68E6F5F253C9B2D001A1B4C /* BaseEmojiLabel.swift in Sources */, D68E6F5F253C9B2D001A1B4C /* BaseEmojiLabel.swift in Sources */,
D6F1F84D2193B56E00F5FE67 /* Cache.swift in Sources */, D6F1F84D2193B56E00F5FE67 /* Cache.swift in Sources */,
D6F0B12B24A3071C001E48C3 /* MainSplitViewController.swift in Sources */, D6F0B12B24A3071C001E48C3 /* MainSplitViewController.swift in Sources */,

View File

@ -58,8 +58,7 @@ class ListTimelineViewController: TimelineTableViewController {
dismiss(animated: true) dismiss(animated: true)
// todo: show loading indicator // todo: show loading indicator
timelineSegments = [] reloadInitialItems()
loadInitialStatuses()
} }
} }

View File

@ -9,7 +9,7 @@
import UIKit import UIKit
import Pachyderm import Pachyderm
class NotificationsTableViewController: EnhancedTableViewController { class NotificationsTableViewController: TimelineLikeTableViewController<NotificationGroup> {
private let statusCell = "statusCell" private let statusCell = "statusCell"
private let actionGroupCell = "actionGroupCell" private let actionGroupCell = "actionGroupCell"
@ -20,125 +20,112 @@ class NotificationsTableViewController: EnhancedTableViewController {
weak var mastodonController: MastodonController! weak var mastodonController: MastodonController!
private let excludedTypes: [Pachyderm.Notification.Kind] private let excludedTypes: [Pachyderm.Notification.Kind]
private let groupTypes = [Notification.Kind.favourite, .reblog, .follow] private let groupTypes = [Pachyderm.Notification.Kind.favourite, .reblog, .follow]
private var loaded = false
private var groups: [NotificationGroup] = []
private let pageSize = 20
private var newer: RequestRange? private var newer: RequestRange?
private var older: RequestRange? private var older: RequestRange?
private var lastLastVisibleRow: IndexPath?
init(allowedTypes: [Pachyderm.Notification.Kind], mastodonController: MastodonController) { init(allowedTypes: [Pachyderm.Notification.Kind], mastodonController: MastodonController) {
self.excludedTypes = Array(Set(Pachyderm.Notification.Kind.allCases).subtracting(allowedTypes)) self.excludedTypes = Array(Set(Pachyderm.Notification.Kind.allCases).subtracting(allowedTypes))
self.mastodonController = mastodonController self.mastodonController = mastodonController
super.init(style: .plain) super.init()
#if !targetEnvironment(macCatalyst)
self.refreshControl = UIRefreshControl()
refreshControl!.addTarget(self, action: #selector(refreshNotifications), for: .valueChanged)
#endif
addKeyCommand(MenuController.refreshCommand(discoverabilityTitle: NSLocalizedString("Refresh Notifications", comment: "refresh notifications command discoverability title")))
} }
required init?(coder aDecoder: NSCoder) { required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented") fatalError("init(coder:) has not been implemented")
} }
override class func refreshCommandTitle() -> String {
return NSLocalizedString("Refresh Notifications", comment: "refresh notifications command discoverability title")
}
override func viewDidLoad() { override func viewDidLoad() {
super.viewDidLoad() super.viewDidLoad()
tableView.rowHeight = UITableView.automaticDimension
tableView.estimatedRowHeight = 140
tableView.register(UINib(nibName: "TimelineStatusTableViewCell", bundle: .main), forCellReuseIdentifier: statusCell) tableView.register(UINib(nibName: "TimelineStatusTableViewCell", bundle: .main), forCellReuseIdentifier: statusCell)
tableView.register(UINib(nibName: "ActionNotificationGroupTableViewCell", bundle: .main), forCellReuseIdentifier: actionGroupCell) tableView.register(UINib(nibName: "ActionNotificationGroupTableViewCell", bundle: .main), forCellReuseIdentifier: actionGroupCell)
tableView.register(UINib(nibName: "FollowNotificationGroupTableViewCell", bundle: .main), forCellReuseIdentifier: followGroupCell) tableView.register(UINib(nibName: "FollowNotificationGroupTableViewCell", bundle: .main), forCellReuseIdentifier: followGroupCell)
tableView.register(UINib(nibName: "FollowRequestNotificationTableViewCell", bundle: .main), forCellReuseIdentifier: followRequestCell) tableView.register(UINib(nibName: "FollowRequestNotificationTableViewCell", bundle: .main), forCellReuseIdentifier: followRequestCell)
tableView.register(UINib(nibName: "BasicTableViewCell", bundle: .main), forCellReuseIdentifier: unknownCell) tableView.register(UINib(nibName: "BasicTableViewCell", bundle: .main), forCellReuseIdentifier: unknownCell)
tableView.prefetchDataSource = self
} }
override func viewWillAppear(_ animated: Bool) { override func loadInitialItems(completion: @escaping ([NotificationGroup]) -> Void) {
super.viewWillAppear(animated)
if !loaded {
loaded = true
let request = Client.getNotifications(excludeTypes: excludedTypes) let request = Client.getNotifications(excludeTypes: excludedTypes)
mastodonController.run(request) { result in mastodonController.run(request) { (response) in
guard case let .success(notifications, pagination) = result else { fatalError() } guard case let .success(notifications, pagination) = response else { fatalError() }
let groups = NotificationGroup.createGroups(notifications: notifications, only: self.groupTypes) let groups = NotificationGroup.createGroups(notifications: notifications, only: self.groupTypes)
self.groups.append(contentsOf: groups)
self.newer = pagination?.newer self.newer = pagination?.newer
self.older = pagination?.older self.older = pagination?.older
self.mastodonController.persistentContainer.addAll(notifications: notifications) { self.mastodonController.persistentContainer.addAll(notifications: notifications) {
DispatchQueue.main.async { completion(groups)
self.tableView.reloadData()
}
}
} }
} }
} }
override func viewWillDisappear(_ animated: Bool) { override func loadOlder(completion: @escaping ([NotificationGroup]) -> Void) {
super.viewWillDisappear(animated) guard let older = older else {
completion([])
pruneOffscreenRows()
}
private func pruneOffscreenRows() {
guard let lastVisibleRow = lastLastVisibleRow else {
return return
} }
let lastRowIndex = groups.count - 1
if lastVisibleRow.row < lastRowIndex - pageSize { let request = Client.getNotifications(excludeTypes: excludedTypes, range: older)
// if there are more than 20 rows below the lats visible one mastodonController.run(request) { (response) in
guard case let .success(newNotifications, pagination) = response else { fatalError() }
let rowIndicesToRemove = (lastVisibleRow.row + pageSize)..<groups.count self.older = pagination?.older
let groupsToRemove = groups[rowIndicesToRemove] let groups = NotificationGroup.createGroups(notifications: newNotifications, only: self.groupTypes)
for group in groupsToRemove {
for notification in group.notifications { self.mastodonController.persistentContainer.addAll(notifications: newNotifications) {
if let id = notification.status?.id { completion(groups)
mastodonController.persistentContainer.status(for: id)?.decrementReferenceCount()
} }
} }
} }
groups.removeSubrange(rowIndicesToRemove) override func loadNewer(completion: @escaping ([NotificationGroup]) -> Void) {
guard let newer = newer else {
completion([])
return
}
let removedIndexPaths = rowIndicesToRemove.map { IndexPath(row: $0, section: 0) } let request = Client.getNotifications(excludeTypes: excludedTypes, range: newer)
UIView.performWithoutAnimation { mastodonController.run(request) { (response) in
tableView.deleteRows(at: removedIndexPaths, with: .none) guard case let .success(newNotifications, pagination) = response else { fatalError() }
self.newer = pagination?.newer
let groups = NotificationGroup.createGroups(notifications: newNotifications, only: self.groupTypes)
self.mastodonController.persistentContainer.addAll(notifications: newNotifications) {
completion(groups)
} }
} }
} }
// MARK: - Table view data source private func dismissNotificationsInGroup(at indexPath: IndexPath, completion: (() -> Void)? = nil) {
let group = DispatchGroup()
override func numberOfSections(in tableView: UITableView) -> Int { item(for: indexPath).notifications
return 1 .map { Pachyderm.Notification.dismiss(id: $0.id) }
.forEach { (request) in
group.enter()
mastodonController.run(request) { (_) in
group.leave()
}
}
group.notify(queue: .main) {
self.sections[indexPath.section].remove(at: indexPath.row)
self.tableView.deleteRows(at: [indexPath], with: .automatic)
completion?()
}
} }
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { // MARK: - UITableViewDataSource
return groups.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let group = groups[indexPath.row] let group = item(for: indexPath)
switch group.kind { switch group.kind {
case .mention: case .mention:
@ -176,45 +163,7 @@ class NotificationsTableViewController: EnhancedTableViewController {
} }
} }
// MARK: - Table view delegate // MARK: - UITableViewDelegate
override func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
lastLastVisibleRow = tableView.indexPathsForVisibleRows?.last
if indexPath.row == groups.count - 1 {
guard let older = older else { return }
let request = Client.getNotifications(excludeTypes: excludedTypes, range: older)
mastodonController.run(request) { result in
guard case let .success(newNotifications, pagination) = result else { fatalError() }
let groups = NotificationGroup.createGroups(notifications: newNotifications, only: self.groupTypes)
let newIndexPaths = (self.groups.count..<(self.groups.count + groups.count)).map {
IndexPath(row: $0, section: 0)
}
self.groups.append(contentsOf: groups)
self.older = pagination?.older
self.mastodonController.persistentContainer.addAll(notifications: newNotifications) {
DispatchQueue.main.async {
UIView.performWithoutAnimation {
self.tableView.insertRows(at: newIndexPaths, with: .automatic)
}
}
}
}
}
}
override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
override func tableView(_ tableView: UITableView, leadingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
return (tableView.cellForRow(at: indexPath) as? TableViewSwipeActionProvider)?.leadingSwipeActionsConfiguration()
}
override func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? { override func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
let dismissAction = UIContextualAction(style: .destructive, title: NSLocalizedString("Dismiss", comment: "dismiss notification swipe action title")) { (action, view, completion) in let dismissAction = UIContextualAction(style: .destructive, title: NSLocalizedString("Dismiss", comment: "dismiss notification swipe action title")) { (action, view, completion) in
@ -223,7 +172,9 @@ class NotificationsTableViewController: EnhancedTableViewController {
} }
} }
dismissAction.image = UIImage(systemName: "clear.fill") dismissAction.image = UIImage(systemName: "clear.fill")
let cellConfiguration = (tableView.cellForRow(at: indexPath) as? TableViewSwipeActionProvider)?.trailingSwipeActionsConfiguration() let cellConfiguration = (tableView.cellForRow(at: indexPath) as? TableViewSwipeActionProvider)?.trailingSwipeActionsConfiguration()
let config: UISwipeActionsConfiguration let config: UISwipeActionsConfiguration
if let cellConfiguration = cellConfiguration { if let cellConfiguration = cellConfiguration {
config = UISwipeActionsConfiguration(actions: cellConfiguration.actions + [dismissAction]) config = UISwipeActionsConfiguration(actions: cellConfiguration.actions + [dismissAction])
@ -237,78 +188,27 @@ class NotificationsTableViewController: EnhancedTableViewController {
override func getSuggestedContextMenuActions(tableView: UITableView, indexPath: IndexPath, point: CGPoint) -> [UIAction] { override func getSuggestedContextMenuActions(tableView: UITableView, indexPath: IndexPath, point: CGPoint) -> [UIAction] {
return [ return [
UIAction(title: "Dismiss Notification", image: UIImage(systemName: "clear.fill"), identifier: .init("dismissnotification"), discoverabilityTitle: nil, attributes: [], state: .off, handler: { (_) in UIAction(title: "Dismiss Notification", image: UIImage(systemName: "clear.fill"), identifier: .init("dismissnotification"), handler: { (_) in
self.dismissNotificationsInGroup(at: indexPath) self.dismissNotificationsInGroup(at: indexPath)
}) })
] ]
} }
func dismissNotificationsInGroup(at indexPath: IndexPath, completion: (() -> Void)? = nil) {
let group = DispatchGroup()
groups[indexPath.row].notifications
.map { Pachyderm.Notification.dismiss(id: $0.id) }
.forEach { (request) in
group.enter()
mastodonController.run(request) { (response) in
group.leave()
}
}
group.notify(queue: .main) {
self.groups.remove(at: indexPath.row)
self.tableView.deleteRows(at: [indexPath], with: .automatic)
completion?()
}
}
@objc func refreshNotifications() {
guard let newer = newer else { return }
let request = Client.getNotifications(excludeTypes: excludedTypes, range: newer)
mastodonController.run(request) { result in
guard case let .success(newNotifications, pagination) = result else { fatalError() }
let groups = NotificationGroup.createGroups(notifications: newNotifications, only: self.groupTypes)
self.groups.insert(contentsOf: groups, at: 0)
if let newer = pagination?.newer {
self.newer = newer
}
self.mastodonController.persistentContainer.addAll(notifications: newNotifications) {
DispatchQueue.main.async {
let newIndexPaths = (0..<groups.count).map {
IndexPath(row: $0, section: 0)
}
UIView.performWithoutAnimation {
self.tableView.insertRows(at: newIndexPaths, with: .automatic)
}
self.refreshControl?.endRefreshing()
// maintain the current position in the list (don't scroll to top)
self.tableView.scrollToRow(at: IndexPath(row: newNotifications.count, section: 0), at: .top, animated: false)
}
}
}
} }
extension NotificationsTableViewController: TuskerNavigationDelegate {
var apiController: MastodonController { mastodonController }
} }
extension NotificationsTableViewController: StatusTableViewCellDelegate { extension NotificationsTableViewController: StatusTableViewCellDelegate {
var apiController: MastodonController { mastodonController }
func statusCellCollapsedStateChanged(_ cell: BaseStatusTableViewCell) { func statusCellCollapsedStateChanged(_ cell: BaseStatusTableViewCell) {
// causes the table view to recalculate the cell heights cellHeightChanged()
tableView.beginUpdates()
tableView.endUpdates()
} }
} }
extension NotificationsTableViewController: UITableViewDataSourcePrefetching { extension NotificationsTableViewController: UITableViewDataSourcePrefetching {
func tableView(_ tableView: UITableView, prefetchRowsAt indexPaths: [IndexPath]) { func tableView(_ tableView: UITableView, prefetchRowsAt indexPaths: [IndexPath]) {
for indexPath in indexPaths { for indexPath in indexPaths {
for notification in groups[indexPath.row].notifications { for notification in item(for: indexPath).notifications {
// todo: this account object could be stale
_ = ImageCache.avatars.get(notification.account.avatar, completion: nil) _ = ImageCache.avatars.get(notification.account.avatar, completion: nil)
} }
} }
@ -316,21 +216,9 @@ extension NotificationsTableViewController: UITableViewDataSourcePrefetching {
func tableView(_ tableView: UITableView, cancelPrefetchingForRowsAt indexPaths: [IndexPath]) { func tableView(_ tableView: UITableView, cancelPrefetchingForRowsAt indexPaths: [IndexPath]) {
for indexPath in indexPaths { for indexPath in indexPaths {
for notification in groups[indexPath.row].notifications { for notification in item(for: indexPath).notifications {
ImageCache.avatars.cancelWithoutCallback(notification.account.avatar) ImageCache.avatars.cancelWithoutCallback(notification.account.avatar)
} }
} }
} }
} }
extension NotificationsTableViewController: RefreshableViewController {
func refresh() {
refreshNotifications()
}
}
extension NotificationsTableViewController: BackgroundableViewController {
func sceneDidEnterBackground() {
pruneOffscreenRows()
}
}

View File

@ -9,7 +9,7 @@
import UIKit import UIKit
import Pachyderm import Pachyderm
class ProfileStatusesViewController: EnhancedTableViewController { class ProfileStatusesViewController: TimelineLikeTableViewController<TimelineEntry> {
weak var mastodonController: MastodonController! weak var mastodonController: MastodonController!
@ -19,20 +19,15 @@ class ProfileStatusesViewController: EnhancedTableViewController {
let kind: Kind let kind: Kind
private var pinnedStatuses: [(id: String, state: StatusState)] = []
private var timelineSegments: [[(id: String, state: StatusState)]] = []
private var older: RequestRange? private var older: RequestRange?
private var newer: RequestRange? private var newer: RequestRange?
var loaded = false
init(accountID: String?, kind: Kind, mastodonController: MastodonController) { init(accountID: String?, kind: Kind, mastodonController: MastodonController) {
self.accountID = accountID self.accountID = accountID
self.kind = kind self.kind = kind
self.mastodonController = mastodonController self.mastodonController = mastodonController
super.init(style: .plain) super.init()
} }
required init?(coder: NSCoder) { required init?(coder: NSCoder) {
@ -42,76 +37,117 @@ class ProfileStatusesViewController: EnhancedTableViewController {
override func viewDidLoad() { override func viewDidLoad() {
super.viewDidLoad() super.viewDidLoad()
view.backgroundColor = .systemBackground
#if !targetEnvironment(macCatalyst)
refreshControl = UIRefreshControl()
refreshControl!.addTarget(self, action: #selector(refreshStatuses), for: .valueChanged)
#endif
addKeyCommand(MenuController.refreshCommand(discoverabilityTitle: NSLocalizedString("Refresh Statuses", comment: "refresh statuses command discoverability title")))
tableView.rowHeight = UITableView.automaticDimension
tableView.estimatedRowHeight = 140
tableView.register(UINib(nibName: "TimelineStatusTableViewCell", bundle: .main), forCellReuseIdentifier: "statusCell") tableView.register(UINib(nibName: "TimelineStatusTableViewCell", bundle: .main), forCellReuseIdentifier: "statusCell")
tableView.prefetchDataSource = self
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
if !loaded,
let accountID = accountID,
let account = mastodonController.persistentContainer.account(for: accountID) {
updateUI(account: account)
}
} }
func updateUI(account: AccountMO) { func updateUI(account: AccountMO) {
guard !loaded else { return } loadInitial()
loaded = true }
if kind == .statuses { override class func refreshCommandTitle() -> String {
return NSLocalizedString("Refresh Statuses", comment: "refresh statuses command discoverability title")
}
override func headerSectionsCount() -> Int {
return 1
}
override func loadInitial() {
guard accountID != nil else {
return
}
if !loaded {
loadPinnedStatuses()
}
super.loadInitial()
}
private func loadPinnedStatuses() {
guard kind == .statuses else {
return
}
getPinnedStatuses { (response) in getPinnedStatuses { (response) in
guard case let .success(statuses, _) = response else { guard case let .success(statuses, _) = response,
!statuses.isEmpty else {
// todo: error message // todo: error message
return return
} }
if statuses.isEmpty { return }
self.mastodonController.persistentContainer.addAll(statuses: statuses) { self.mastodonController.persistentContainer.addAll(statuses: statuses) {
self.pinnedStatuses = statuses.map { ($0.id, .unknown) } let items = statuses.map { ($0.id, StatusState.unknown) }
let indexPaths = (0..<statuses.count).map { IndexPath(row: $0, section: 0) }
DispatchQueue.main.async { DispatchQueue.main.async {
UIView.performWithoutAnimation { UIView.performWithoutAnimation {
self.tableView.insertRows(at: indexPaths, with: .none) if self.sections.count < 1 {
self.sections.append(items)
self.tableView.insertSections(IndexSet(integer: 0), with: .none)
} else {
self.sections[0] = items
self.tableView.reloadSections(IndexSet(integer: 0), with: .none)
}
} }
} }
} }
} }
} }
override func loadInitialItems(completion: @escaping ([TimelineEntry]) -> Void) {
getStatuses { (response) in getStatuses { (response) in
guard case let .success(statuses, pagination) = response else { guard case let .success(statuses, pagination) = response,
!statuses.isEmpty else {
// todo: error message // todo: error message
return return
} }
if statuses.isEmpty { return }
self.mastodonController.persistentContainer.addAll(statuses: statuses) {
self.timelineSegments.append(statuses.map { ($0.id, .unknown) })
self.older = pagination?.older self.older = pagination?.older
self.newer = pagination?.newer self.newer = pagination?.newer
DispatchQueue.main.async { self.mastodonController.persistentContainer.addAll(statuses: statuses) {
UIView.performWithoutAnimation { completion(statuses.map { ($0.id, .unknown) })
self.tableView.insertSections(IndexSet(integer: 1), with: .none)
} }
} }
} }
override func loadOlder(completion: @escaping ([TimelineEntry]) -> Void) {
guard let older = older else {
completion([])
return
}
getStatuses(for: older) { (response) in
guard case let .success(statuses, pagination) = response else {
// todo: error message
completion([])
return
}
self.older = pagination?.older
self.mastodonController.persistentContainer.addAll(statuses: statuses) {
completion(statuses.map { ($0.id, .unknown) })
}
}
}
override func loadNewer(completion: @escaping ([TimelineEntry]) -> Void) {
guard let newer = newer else {
completion([])
return
}
getStatuses(for: newer) { (response) in
guard case let .success(statuses, pagination) = response else {
// todo: error message
completion([])
return
}
self.newer = pagination?.newer
self.mastodonController.persistentContainer.addAll(statuses: statuses) {
completion(statuses.map { ($0.id, .unknown) })
}
} }
} }
@ -133,47 +169,19 @@ class ProfileStatusesViewController: EnhancedTableViewController {
mastodonController.run(request, completion: completion) mastodonController.run(request, completion: completion)
} }
// MARK: Interaction override func refresh() {
super.refresh()
@objc func refreshStatuses() {
guard let newer = newer else { return }
getStatuses(for: newer) { (response) in
guard case let .success(newStatuses, pagination) = response else {
// todo: error message
return
}
self.mastodonController.persistentContainer.addAll(statuses: newStatuses) {
// if there's no newer request range (because no statuses were returned),
// we don't want to change the current newer pagination, so that we can
// continue to load statuses newer than whatever was last loaded
if let newer = pagination?.newer {
self.newer = newer
}
let indexPaths = (0..<newStatuses.count).map { IndexPath(row: $0, section: 1) }
DispatchQueue.main.async {
self.timelineSegments[0].insert(contentsOf: newStatuses.map { ($0.id, .unknown) }, at: 0)
UIView.performWithoutAnimation {
self.tableView.insertRows(at: indexPaths, with: .none)
}
self.refreshControl?.endRefreshing()
}
}
}
if kind == .statuses { if kind == .statuses {
getPinnedStatuses { (response) in getPinnedStatuses { (response) in
guard case let .success(newPinnedStatuses, _) = response else { guard case let .success(newPinnedStatues, _) = response else {
// todo: error message // todo: error message
return return
} }
self.mastodonController.persistentContainer.addAll(statuses: newPinnedStatuses) { self.mastodonController.persistentContainer.addAll(statuses: newPinnedStatues) {
let oldPinnedStatuses = self.pinnedStatuses let oldPinnedStatuses = self.sections[0]
let pinnedStatuses = newPinnedStatuses.map { (status) -> (id: String, state: StatusState) in let pinnedStatues = newPinnedStatues.map { (status) -> TimelineEntry in
let state: StatusState let state: StatusState
if let (_, oldState) = oldPinnedStatuses.first(where: { $0.id == status.id }) { if let (_, oldState) = oldPinnedStatuses.first(where: { $0.id == status.id }) {
state = oldState state = oldState
@ -183,7 +191,11 @@ class ProfileStatusesViewController: EnhancedTableViewController {
return (status.id, state) return (status.id, state)
} }
DispatchQueue.main.async { DispatchQueue.main.async {
self.pinnedStatuses = pinnedStatuses if self.sections.count < 1 {
self.sections.append(pinnedStatues)
} else {
self.sections[0] = pinnedStatues
}
UIView.performWithoutAnimation { UIView.performWithoutAnimation {
self.tableView.reloadSections(IndexSet(integer: 0), with: .none) self.tableView.reloadSections(IndexSet(integer: 0), with: .none)
} }
@ -193,83 +205,19 @@ class ProfileStatusesViewController: EnhancedTableViewController {
} }
} }
// MARK: Table view data source // MARK: - UITableViewDatasource
override func numberOfSections(in tableView: UITableView) -> Int {
// 1 for pinned, rest for timeline
return 1 + timelineSegments.count
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if section == 0 {
return pinnedStatuses.count
} else {
return timelineSegments[section - 1].count
}
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "statusCell", for: indexPath) as! TimelineStatusTableViewCell let cell = tableView.dequeueReusableCell(withIdentifier: "statusCell", for: indexPath) as! TimelineStatusTableViewCell
cell.delegate = self cell.delegate = self
cell.showPinned = indexPath.section == 0
if indexPath.section == 0 { let (id, state) = item(for: indexPath)
cell.showPinned = true
let (id, state) = pinnedStatuses[indexPath.row]
cell.updateUI(statusID: id, state: state) cell.updateUI(statusID: id, state: state)
} else {
cell.showPinned = false
let (id, state) = timelineSegments[indexPath.section - 1][indexPath.row]
cell.updateUI(statusID: id, state: state)
}
return cell return cell
} }
override func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
// load older statuses if at bottom
if timelineSegments.count > 0,
indexPath.section == timelineSegments.count,
indexPath.row == timelineSegments[indexPath.section - 1].count - 1 {
guard let older = older else { return }
getStatuses(for: older) { (response) in
guard case let .success(newStatuses, pagination) = response else {
// todo: error message
return
}
self.mastodonController.persistentContainer.addAll(statuses: newStatuses) {
// if there is no older request range, we want to set ours to nil
// otherwise we would end up loading the same statuses again
self.older = pagination?.older
DispatchQueue.main.async {
let start = self.timelineSegments[indexPath.section - 1].count
let indexPaths = (0..<newStatuses.count).map { IndexPath(row: start + $0, section: indexPath.section) }
self.timelineSegments[indexPath.section - 1].append(contentsOf: newStatuses.map { ($0.id, .unknown) })
UIView.performWithoutAnimation {
self.tableView.insertRows(at: indexPaths, with: .none)
}
}
}
}
}
}
override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
override func tableView(_ tableView: UITableView, leadingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
return (tableView.cellForRow(at: indexPath) as? TableViewSwipeActionProvider)?.leadingSwipeActionsConfiguration()
}
override func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
return (tableView.cellForRow(at: indexPath) as? TableViewSwipeActionProvider)?.trailingSwipeActionsConfiguration()
}
} }
extension ProfileStatusesViewController { extension ProfileStatusesViewController {
@ -278,26 +226,25 @@ extension ProfileStatusesViewController {
} }
} }
extension ProfileStatusesViewController: StatusTableViewCellDelegate { extension ProfileStatusesViewController: TuskerNavigationDelegate {
var apiController: MastodonController { mastodonController } var apiController: MastodonController { mastodonController }
}
extension ProfileStatusesViewController: StatusTableViewCellDelegate {
func statusCellCollapsedStateChanged(_ cell: BaseStatusTableViewCell) { func statusCellCollapsedStateChanged(_ cell: BaseStatusTableViewCell) {
// causes the table view to recalculate the cell heights cellHeightChanged()
tableView.beginUpdates()
tableView.endUpdates()
} }
} }
extension ProfileStatusesViewController: UITableViewDataSourcePrefetching { extension ProfileStatusesViewController: UITableViewDataSourcePrefetching {
func tableView(_ tableView: UITableView, prefetchRowsAt indexPaths: [IndexPath]) { func tableView(_ tableView: UITableView, prefetchRowsAt indexPaths: [IndexPath]) {
for indexPath in indexPaths { for indexPath in indexPaths {
let statusID: String let statusID = item(for: indexPath).id
if indexPath.section == 0 {
statusID = pinnedStatuses[indexPath.row].id guard let status = mastodonController.persistentContainer.status(for: statusID) else {
} else { continue
statusID = timelineSegments[indexPath.section - 1][indexPath.row].id
} }
guard let status = mastodonController.persistentContainer.status(for: statusID) else { continue }
_ = ImageCache.avatars.get(status.account.avatar, completion: nil) _ = ImageCache.avatars.get(status.account.avatar, completion: nil)
for attachment in status.attachments where attachment.kind == .image { for attachment in status.attachments where attachment.kind == .image {
_ = ImageCache.attachments.get(attachment.url, completion: nil) _ = ImageCache.attachments.get(attachment.url, completion: nil)
@ -307,13 +254,11 @@ extension ProfileStatusesViewController: UITableViewDataSourcePrefetching {
func tableView(_ tableView: UITableView, cancelPrefetchingForRowsAt indexPaths: [IndexPath]) { func tableView(_ tableView: UITableView, cancelPrefetchingForRowsAt indexPaths: [IndexPath]) {
for indexPath in indexPaths { for indexPath in indexPaths {
let statusID: String let statusID = item(for: indexPath).id
if indexPath.section == 0 {
statusID = pinnedStatuses[indexPath.row].id guard let status = mastodonController.persistentContainer.status(for: statusID) else {
} else { continue
statusID = timelineSegments[indexPath.section - 1][indexPath.row].id
} }
guard let status = mastodonController.persistentContainer.status(for: statusID) else { continue }
ImageCache.avatars.cancelWithoutCallback(status.account.avatar) ImageCache.avatars.cancelWithoutCallback(status.account.avatar)
for attachment in status.attachments where attachment.kind == .image { for attachment in status.attachments where attachment.kind == .image {
ImageCache.avatars.cancelWithoutCallback(attachment.url) ImageCache.avatars.cancelWithoutCallback(attachment.url)
@ -321,9 +266,3 @@ extension ProfileStatusesViewController: UITableViewDataSourcePrefetching {
} }
} }
} }
extension ProfileStatusesViewController: RefreshableViewController {
func refresh() {
refreshStatuses()
}
}

View File

@ -1,5 +1,5 @@
// //
// StatusesTableViewController.swift // TimelineTableViewController.swift
// Tusker // Tusker
// //
// Created by Shadowfacts on 8/15/18. // Created by Shadowfacts on 8/15/18.
@ -9,41 +9,29 @@
import UIKit import UIKit
import Pachyderm import Pachyderm
class TimelineTableViewController: EnhancedTableViewController, StatusTableViewCellDelegate { typealias TimelineEntry = (id: String, state: StatusState)
var timeline: Timeline! class TimelineTableViewController: TimelineLikeTableViewController<TimelineEntry> {
let timeline: Timeline
weak var mastodonController: MastodonController! weak var mastodonController: MastodonController!
private var loaded = false
var timelineSegments: [[(id: String, state: StatusState)]] = []
private let pageSize = 20
private var newer: RequestRange? private var newer: RequestRange?
private var older: RequestRange? private var older: RequestRange?
private var lastLastVisibleRow: IndexPath?
init(for timeline: Timeline, mastodonController: MastodonController) { init(for timeline: Timeline, mastodonController: MastodonController) {
self.timeline = timeline self.timeline = timeline
self.mastodonController = mastodonController self.mastodonController = mastodonController
super.init(style: .plain) super.init()
title = timeline.title title = timeline.title
tabBarItem.image = timeline.tabBarImage tabBarItem.image = timeline.tabBarImage
#if !targetEnvironment(macCatalyst)
self.refreshControl = UIRefreshControl()
refreshControl!.addTarget(self, action: #selector(refreshStatuses), for: .valueChanged)
#endif
addKeyCommand(MenuController.refreshCommand(discoverabilityTitle: NSLocalizedString("Refresh Statuses", comment: "refresh statuses command discoverability title")))
userActivity = UserActivityManager.showTimelineActivity(timeline: timeline) userActivity = UserActivityManager.showTimelineActivity(timeline: timeline)
} }
required init?(coder aDecoder: NSCoder) { required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented") fatalError("init(coder:) has not been implemented")
} }
@ -52,120 +40,89 @@ class TimelineTableViewController: EnhancedTableViewController, StatusTableViewC
// decrement reference counts of any statuses we still have // decrement reference counts of any statuses we still have
// if the app is currently being quit, this will not affect the persisted data because // if the app is currently being quit, this will not affect the persisted data because
// the persistent container would already have been saved in SceneDelegate.sceneDidEnterBackground(_:) // the persistent container would already have been saved in SceneDelegate.sceneDidEnterBackground(_:)
for segment in timelineSegments { for section in sections {
for (id, _) in segment { for (id, _) in section {
persistentContainer.status(for: id)?.decrementReferenceCount() persistentContainer.status(for: id)?.decrementReferenceCount()
} }
} }
} }
func statusID(for indexPath: IndexPath) -> String {
return timelineSegments[indexPath.section][indexPath.row].id
}
override func viewDidLoad() { override func viewDidLoad() {
super.viewDidLoad() super.viewDidLoad()
tableView.rowHeight = UITableView.automaticDimension tableView.register(UINib(nibName: "TimelineStatusTableViewCell", bundle: .main), forCellReuseIdentifier: "statusCell")
tableView.estimatedRowHeight = 140
tableView.register(UINib(nibName: "TimelineStatusTableViewCell", bundle: nil), forCellReuseIdentifier: "statusCell")
tableView.prefetchDataSource = self
} }
override func viewWillAppear(_ animated: Bool) { override class func refreshCommandTitle() -> String {
super.viewWillAppear(animated) return NSLocalizedString("Refresh Statuses", comment: "refresh status command discoverability title")
loadInitialStatuses()
} }
override func viewWillDisappear(_ animated: Bool) { override func willRemoveRows(at indexPaths: [IndexPath]) {
super.viewWillDisappear(animated) for indexPath in indexPaths {
let id = item(for: indexPath).id
pruneOffscreenRows() mastodonController.persistentContainer.status(for: id)?.decrementReferenceCount()
}
} }
func loadInitialStatuses() { override func loadInitialItems(completion: @escaping ([TimelineEntry]) -> Void) {
guard !loaded else { return }
loaded = true
let request = Client.getStatuses(timeline: timeline) let request = Client.getStatuses(timeline: timeline)
mastodonController.run(request) { response in
mastodonController?.run(request) { (response) in
guard case let .success(statuses, pagination) = response else { fatalError() } guard case let .success(statuses, pagination) = response else { fatalError() }
// todo: possible race condition here? we update the underlying data before waiting to reload the table view
self.timelineSegments.insert(statuses.map { ($0.id, .unknown) }, at: 0)
self.newer = pagination?.newer self.newer = pagination?.newer
self.older = pagination?.older self.older = pagination?.older
self.mastodonController.persistentContainer.addAll(statuses: statuses) {
DispatchQueue.main.async { self.mastodonController?.persistentContainer.addAll(statuses: statuses) {
self.tableView.reloadData() completion(statuses.map { ($0.id, .unknown) })
}
} }
} }
} }
private func pruneOffscreenRows() { override func loadOlder(completion: @escaping ([TimelineEntry]) -> Void) {
guard let lastVisibleRow = lastLastVisibleRow else { guard let older = older else {
completion([])
return return
} }
let lastSectionIndex = timelineSegments.count - 1
if lastVisibleRow.section < lastSectionIndex { let request = Client.getStatuses(timeline: timeline, range: older)
// if there is a section below the last visible one
let sectionsToRemove = (lastVisibleRow.section + 1)...lastSectionIndex mastodonController.run(request) { (response) in
guard case let .success(statuses, pagination) = response else { fatalError() }
for section in sectionsToRemove { self.older = pagination?.older
for (id, _) in timelineSegments.remove(at: section) {
mastodonController.persistentContainer.status(for: id)?.decrementReferenceCount()
}
}
UIView.performWithoutAnimation {
tableView.deleteSections(IndexSet(sectionsToRemove), with: .none)
}
} else if lastVisibleRow.section == lastSectionIndex {
let lastSection = timelineSegments.last!
let lastRowIndex = lastSection.count - 1
if lastVisibleRow.row < lastRowIndex - 20 {
// if there are more than 20 rows in the current section below the last visible one
let rowIndicesInLastSectionToRemove = (lastVisibleRow.row + 20)..<lastSection.count
let statusesToRemove = lastSection[rowIndicesInLastSectionToRemove]
for (id, _) in statusesToRemove {
mastodonController.persistentContainer.status(for: id)?.decrementReferenceCount()
}
timelineSegments[lastSectionIndex].removeSubrange(rowIndicesInLastSectionToRemove)
let removedIndexPaths = rowIndicesInLastSectionToRemove.map { IndexPath(row: $0, section: lastSectionIndex) }
UIView.performWithoutAnimation {
tableView.deleteRows(at: removedIndexPaths, with: .none)
}
self.mastodonController?.persistentContainer.addAll(statuses: statuses) {
completion(statuses.map { ($0.id, .unknown) })
} }
} }
} }
// MARK: - Table view data source override func loadNewer(completion: @escaping ([TimelineEntry]) -> Void) {
guard let newer = newer else {
override func numberOfSections(in tableView: UITableView) -> Int { completion([])
return timelineSegments.count return
} }
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { let request = Client.getStatuses(timeline: timeline, range: newer)
return timelineSegments[section].count
mastodonController.run(request) { (response) in
guard case let .success(statuses, pagination) = response else { fatalError() }
self.newer = pagination?.newer
self.mastodonController?.persistentContainer.addAll(statuses: statuses) {
completion(statuses.map { ($0.id, .unknown) })
}
}
} }
// MARK: - UITableViewDataSource
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
guard let cell = tableView.dequeueReusableCell(withIdentifier: "statusCell", for: indexPath) as? TimelineStatusTableViewCell else { fatalError() } guard let cell = tableView.dequeueReusableCell(withIdentifier: "statusCell", for: indexPath) as? TimelineStatusTableViewCell else { fatalError() }
let (id, state) = timelineSegments[indexPath.section][indexPath.row] let (id, state) = item(for: indexPath)
cell.delegate = self cell.delegate = self
cell.updateUI(statusID: id, state: state) cell.updateUI(statusID: id, state: state)
@ -173,104 +130,24 @@ class TimelineTableViewController: EnhancedTableViewController, StatusTableViewC
return cell return cell
} }
// MARK: - Table view delegate
override func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
// this assumes that indexPathsForVisibleRows is always in order
lastLastVisibleRow = tableView.indexPathsForVisibleRows?.last
// load older statuses, if necessary
if indexPath.section == timelineSegments.count - 1,
indexPath.row == timelineSegments[indexPath.section].count - 1 {
guard let older = older else { return }
let request = Client.getStatuses(timeline: timeline, range: older)
mastodonController.run(request) { response in
guard case let .success(newStatuses, pagination) = response else { fatalError() }
self.older = pagination?.older
self.mastodonController.persistentContainer.addAll(statuses: newStatuses) {
DispatchQueue.main.async {
let newRows = self.timelineSegments.last!.count..<(self.timelineSegments.last!.count + newStatuses.count)
let newIndexPaths = newRows.map { IndexPath(row: $0, section: self.timelineSegments.count - 1) }
self.timelineSegments[self.timelineSegments.count - 1].append(contentsOf: newStatuses.map { ($0.id, .unknown) })
UIView.performWithoutAnimation {
self.tableView.insertRows(at: newIndexPaths, with: .none)
}
}
}
}
}
} }
override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool { extension TimelineTableViewController: TuskerNavigationDelegate {
return true
}
override func tableView(_ tableView: UITableView, leadingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
return (tableView.cellForRow(at: indexPath) as? TableViewSwipeActionProvider)?.leadingSwipeActionsConfiguration()
}
override func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
return (tableView.cellForRow(at: indexPath) as? TableViewSwipeActionProvider)?.trailingSwipeActionsConfiguration()
}
// MARK: - Interaction
@objc func refreshStatuses() {
guard let newer = newer else { return }
let request = Client.getStatuses(timeline: timeline, range: newer)
mastodonController.run(request) { response in
guard case let .success(newStatuses, pagination) = response else { fatalError() }
// If there is no new newer pagination, don't reset it, so that the user can continue refreshing for more recent statuses
// Otherwise, when no new statuses were loaded, it would get reset and the the user would be unable to refresh
if let newer = pagination?.newer {
self.newer = newer
}
self.mastodonController.persistentContainer.addAll(statuses: newStatuses) {
DispatchQueue.main.async {
self.timelineSegments[0].insert(contentsOf: newStatuses.map { ($0.id, .unknown) }, at: 0)
let newIndexPaths = (0..<newStatuses.count).map {
IndexPath(row: $0, section: 0)
}
UIView.performWithoutAnimation {
self.tableView.insertRows(at: newIndexPaths, with: .automatic)
}
self.refreshControl?.endRefreshing()
// maintain the current position in the list (don't scroll to the top)
self.tableView.scrollToRow(at: IndexPath(row: newStatuses.count, section: 0), at: .top, animated: false)
}
}
}
}
@objc func composePressed(_ sender: Any) {
compose()
}
// MARK: - TuskerNavigationDelegate
var apiController: MastodonController { mastodonController } var apiController: MastodonController { mastodonController }
// MARK: - StatusTableViewCellDelegate
func statusCellCollapsedStateChanged(_ cell: BaseStatusTableViewCell) {
// causes the table view to recalculate the cell heights
tableView.beginUpdates()
tableView.endUpdates()
} }
extension TimelineTableViewController: StatusTableViewCellDelegate {
func statusCellCollapsedStateChanged(_ cell: BaseStatusTableViewCell) {
cellHeightChanged()
}
} }
extension TimelineTableViewController: UITableViewDataSourcePrefetching { extension TimelineTableViewController: UITableViewDataSourcePrefetching {
func tableView(_ tableView: UITableView, prefetchRowsAt indexPaths: [IndexPath]) { func tableView(_ tableView: UITableView, prefetchRowsAt indexPaths: [IndexPath]) {
for indexPath in indexPaths { for indexPath in indexPaths {
guard let status = mastodonController.persistentContainer.status(for: statusID(for: indexPath)) else { continue } guard let status = mastodonController.persistentContainer.status(for: item(for: indexPath).id) else {
continue
}
_ = ImageCache.avatars.get(status.account.avatar, completion: nil) _ = ImageCache.avatars.get(status.account.avatar, completion: nil)
for attachment in status.attachments where attachment.kind == .image { for attachment in status.attachments where attachment.kind == .image {
_ = ImageCache.attachments.get(attachment.url, completion: nil) _ = ImageCache.attachments.get(attachment.url, completion: nil)
@ -282,8 +159,11 @@ extension TimelineTableViewController: UITableViewDataSourcePrefetching {
for indexPath in indexPaths { for indexPath in indexPaths {
// todo: this means when removing cells, we can't cancel prefetching // todo: this means when removing cells, we can't cancel prefetching
// is this an issue? // is this an issue?
guard indexPath.section < timelineSegments.count, indexPath.row < timelineSegments[indexPath.section].count, guard indexPath.section < sections.count,
let status = mastodonController.persistentContainer.status(for: statusID(for: indexPath)) else { continue } indexPath.row < sections[indexPath.section].count,
let status = mastodonController.persistentContainer.status(for: item(for: indexPath).id) else {
continue
}
ImageCache.avatars.cancelWithoutCallback(status.account.avatar) ImageCache.avatars.cancelWithoutCallback(status.account.avatar)
for attachment in status.attachments where attachment.kind == .image { for attachment in status.attachments where attachment.kind == .image {
ImageCache.attachments.cancelWithoutCallback(attachment.url) ImageCache.attachments.cancelWithoutCallback(attachment.url)
@ -291,15 +171,3 @@ extension TimelineTableViewController: UITableViewDataSourcePrefetching {
} }
} }
} }
extension TimelineTableViewController: RefreshableViewController {
func refresh() {
refreshStatuses()
}
}
extension TimelineTableViewController: BackgroundableViewController {
func sceneDidEnterBackground() {
pruneOffscreenRows()
}
}

View File

@ -0,0 +1,243 @@
//
// TimelineLikeTableViewController.swift
// Tusker
//
// Created by Shadowfacts on 11/15/20.
// Copyright © 2020 Shadowfacts. All rights reserved.
//
import UIKit
/// A table view controller that manages common functionality between timeline-like UIs.
// For example, this class handles loading new items when the user scrolls to the end,
// refreshing, and pruning offscreen rows automatically.
class TimelineLikeTableViewController<Item>: EnhancedTableViewController, RefreshableViewController {
private(set) var loaded = false
var sections: [[Item]] = []
private let pageSize = 20
private var lastLastVisibleRow: IndexPath?
init() {
super.init(style: .plain)
#if !targetEnvironment(macCatalyst)
self.refreshControl = UIRefreshControl()
self.refreshControl!.addTarget(self, action: #selector(refresh), for: .valueChanged)
#endif
addKeyCommand(MenuController.refreshCommand(discoverabilityTitle: Self.refreshCommandTitle()))
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func item(for indexPath: IndexPath) -> Item {
return sections[indexPath.section][indexPath.row]
}
override func viewDidLoad() {
super.viewDidLoad()
tableView.rowHeight = UITableView.automaticDimension
tableView.estimatedRowHeight = 140
if let prefetchSource = self as? UITableViewDataSourcePrefetching {
tableView.prefetchDataSource = prefetchSource
}
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
loadInitial()
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
pruneOffscreenRows()
}
func loadInitial() {
guard !loaded else { return }
loaded = true
loadInitialItems() { (items) in
guard items.count > 0 else { return }
DispatchQueue.main.async {
if self.sections.count < self.headerSectionsCount() {
self.sections.insert(contentsOf: Array(repeating: [], count: self.headerSectionsCount() - self.sections.count), at: 0)
}
self.sections.append(items)
self.tableView.reloadData()
}
}
}
func reloadInitialItems() {
loaded = false
sections = []
loadInitial()
}
func cellHeightChanged() {
// causes the table view to recalculate the cell heights
tableView.beginUpdates()
tableView.endUpdates()
}
class func refreshCommandTitle() -> String {
return "Refresh"
}
func loadInitialItems(completion: @escaping ([Item]) -> Void) {
fatalError("loadInitialItems(completion:) must be implemented by subclasses")
}
func loadOlder(completion: @escaping ([Item]) -> Void) {
fatalError("loadOlder(completion:) must be implemented by subclasses")
}
func loadNewer(completion: @escaping ([Item]) -> Void) {
fatalError("loadNewer(completion:) must be implemented by subclasses")
}
func willRemoveRows(at indexPaths: [IndexPath]) {
}
func headerSectionsCount() -> Int {
return 0
}
private func pruneOffscreenRows() {
guard let lastVisibleRow = lastLastVisibleRow else {
return
}
let lastSectionIndex = sections.count - 1
if lastVisibleRow.section < lastSectionIndex {
// if there is a section below the last visible one
let sectionsToRemove = (lastVisibleRow.section + 1)...lastSectionIndex
let indexPathsToRemove = sectionsToRemove.flatMap { (section) in
sections[section].indices.map { (row) in
IndexPath(row: row, section: section)
}
}
willRemoveRows(at: indexPathsToRemove)
sections.removeSubrange(sectionsToRemove)
UIView.performWithoutAnimation {
tableView.deleteSections(IndexSet(sectionsToRemove), with: .none)
}
} else if lastVisibleRow.section == lastSectionIndex {
let lastSection = sections.last!
let lastRowIndex = lastSection.count - 1
if lastVisibleRow.row < lastRowIndex - pageSize {
// if there are more than pageSize rows in the current section below the last visible one
let rowIndicesInLastSectionToRemove = (lastVisibleRow.row + 20)..<lastSection.count
let indexPathsToRemove = rowIndicesInLastSectionToRemove.map {
IndexPath(row: $0, section: lastSectionIndex)
}
willRemoveRows(at: indexPathsToRemove)
sections[lastSectionIndex].removeSubrange(rowIndicesInLastSectionToRemove)
UIView.performWithoutAnimation {
tableView.deleteRows(at: indexPathsToRemove, with: .none)
}
}
}
}
// MARK: - UITableViewDataSource
override func numberOfSections(in tableView: UITableView) -> Int {
return sections.count
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return sections[section].count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
fatalError("tableView(_:cellForRowAt:) must be implemented by subclasses")
}
// MARK: - UITableViewDelegate
override func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
// this assumes that indexPathsForVisibleRows is always in order
lastLastVisibleRow = tableView.indexPathsForVisibleRows?.last
if indexPath.section == sections.count - 1,
indexPath.row == sections[indexPath.section].count - 1 {
loadOlder() { (newItems) in
guard newItems.count > 0 else { return }
DispatchQueue.main.async {
let newRows = self.sections.last!.count..<(self.sections.last!.count + newItems.count)
let newIndexPaths = newRows.map { IndexPath(row: $0, section: self.sections.count - 1) }
self.sections[self.sections.count - 1].append(contentsOf: newItems)
UIView.performWithoutAnimation {
self.tableView.insertRows(at: newIndexPaths, with: .none)
}
}
}
}
}
override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
override func tableView(_ tableView: UITableView, leadingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
return (tableView.cellForRow(at: indexPath) as? TableViewSwipeActionProvider)?.leadingSwipeActionsConfiguration()
}
override func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
return (tableView.cellForRow(at: indexPath) as? TableViewSwipeActionProvider)?.trailingSwipeActionsConfiguration()
}
// MARK: - RefreshableViewController
func refresh() {
loadNewer() { (newItems) in
DispatchQueue.main.async {
self.refreshControl?.endRefreshing()
guard newItems.count > 0 else { return }
let firstNonHeaderSection = self.headerSectionsCount()
self.sections[firstNonHeaderSection].insert(contentsOf: newItems, at: 0)
let newIndexPaths = (0..<newItems.count).map { IndexPath(row: $0, section: firstNonHeaderSection) }
UIView.performWithoutAnimation {
self.tableView.insertRows(at: newIndexPaths, with: .none)
}
// maintain the current position in the list (don't scroll to top)
self.tableView.scrollToRow(at: IndexPath(row: newItems.count, section: firstNonHeaderSection), at: .top, animated: false)
}
}
}
}
extension TimelineLikeTableViewController: BackgroundableViewController {
func sceneDidEnterBackground() {
pruneOffscreenRows()
}
}