NetNewsWire/iOS/SceneCoordinator.swift

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//
// NavigationModelController.swift
// NetNewsWire-iOS
//
// Created by Maurice Parker on 4/21/19.
// Copyright © 2019 Ranchero Software. All rights reserved.
//
import UIKit
import UserNotifications
import Account
import Articles
import RSCore
import RSTree
enum SearchScope: Int {
case timeline = 0
case global = 1
}
class SceneCoordinator: NSObject, UndoableCommandRunner, UnreadCountProvider {
var undoableCommands = [UndoableCommand]()
var undoManager: UndoManager? {
return rootSplitViewController.undoManager
}
private var activityManager = ActivityManager()
private var isShowingExtractedArticle = false
private var articleExtractor: ArticleExtractor? = nil
private var rootSplitViewController: RootSplitViewController!
private var masterNavigationController: UINavigationController!
private var masterFeedViewController: MasterFeedViewController!
private var masterTimelineViewController: MasterTimelineViewController?
private var subSplitViewController: UISplitViewController? {
return rootSplitViewController.children.last as? UISplitViewController
}
private var articleViewController: ArticleViewController? {
if let detail = masterNavigationController.viewControllers.last as? ArticleViewController {
return detail
}
if let subSplit = subSplitViewController {
if let navController = subSplit.viewControllers.last as? UINavigationController {
return navController.topViewController as? ArticleViewController
}
} else {
if let navController = rootSplitViewController.viewControllers.last as? UINavigationController {
return navController.topViewController as? ArticleViewController
}
}
return nil
}
private let fetchAndMergeArticlesQueue = CoalescingQueue(name: "Fetch and Merge Articles", interval: 0.5)
private var fetchSerialNumber = 0
private let fetchRequestQueue = FetchRequestQueue()
private var animatingChanges = false
private var shadowTable = [[Node]]()
private var lastSearchString = ""
private var lastSearchScope: SearchScope? = nil
private var isSearching: Bool = false
private var searchArticleIds: Set<String>? = nil
private var isTimelineViewControllerPending = false
private var isArticleViewControllerPending = false
private(set) var sortDirection = AppDefaults.timelineSortDirection {
didSet {
if sortDirection != oldValue {
sortParametersDidChange()
}
}
}
private(set) var groupByFeed = AppDefaults.timelineGroupByFeed {
didSet {
if groupByFeed != oldValue {
sortParametersDidChange()
}
}
}
var displayUndoAvailableTip: Bool {
get { AppDefaults.displayUndoAvailableTip }
set { AppDefaults.displayUndoAvailableTip = newValue }
}
private let treeControllerDelegate = FeedTreeControllerDelegate()
private lazy var treeController: TreeController = {
return TreeController(delegate: treeControllerDelegate)
}()
var stateRestorationActivity: NSUserActivity? {
return activityManager.stateRestorationActivity
}
var isRootSplitCollapsed: Bool {
return rootSplitViewController.isCollapsed
}
var isThreePanelMode: Bool {
return subSplitViewController != nil
}
var rootNode: Node {
return treeController.rootNode
}
private(set) var currentFeedIndexPath: IndexPath?
var timelineIconImage: IconImage? {
if let feed = timelineFetcher as? Feed {
let feedIconImage = appDelegate.feedIconDownloader.icon(for: feed)
if feedIconImage != nil {
return feedIconImage
}
if let faviconIconImage = appDelegate.faviconDownloader.faviconAsIcon(for: feed) {
return faviconIconImage
}
}
return (timelineFetcher as? SmallIconProvider)?.smallIcon
}
var timelineName: String? {
return (timelineFetcher as? DisplayNameProvider)?.nameForDisplay
}
var timelineFetcher: ArticleFetcher? {
didSet {
timelineMiddleIndexPath = nil
if timelineFetcher is Feed {
showFeedNames = false
} else {
showFeedNames = true
}
if isSearching {
fetchAndReplaceArticlesAsync {
self.masterTimelineViewController?.reinitializeArticles()
}
} else {
fetchAndReplaceArticlesSync()
masterTimelineViewController?.reinitializeArticles()
}
}
}
var timelineMiddleIndexPath: IndexPath?
private(set) var showFeedNames = false
private(set) var showIcons = false
var isPrevFeedAvailable: Bool {
guard let indexPath = currentFeedIndexPath else {
return false
}
return indexPath.section > 0 || indexPath.row > 0
}
var isNextFeedAvailable: Bool {
guard let indexPath = currentFeedIndexPath else {
return false
}
let nextIndexPath: IndexPath = {
if indexPath.row + 1 >= shadowTable[indexPath.section].count {
return IndexPath(row: 0, section: indexPath.section + 1)
} else {
return IndexPath(row: indexPath.row + 1, section: indexPath.section)
}
}()
return nextIndexPath.section < shadowTable.count && nextIndexPath.row < shadowTable[nextIndexPath.section].count
}
var prevFeedIndexPath: IndexPath? {
guard isPrevFeedAvailable, let indexPath = currentFeedIndexPath else {
return nil
}
let prevIndexPath: IndexPath = {
if indexPath.row - 1 < 0 {
return IndexPath(row: shadowTable[indexPath.section - 1].count - 1, section: indexPath.section - 1)
} else {
return IndexPath(row: indexPath.row - 1, section: indexPath.section)
}
}()
return prevIndexPath
}
var nextFeedIndexPath: IndexPath? {
guard isNextFeedAvailable, let indexPath = currentFeedIndexPath else {
return nil
}
let nextIndexPath: IndexPath = {
if indexPath.row + 1 >= shadowTable[indexPath.section].count {
return IndexPath(row: 0, section: indexPath.section + 1)
} else {
return IndexPath(row: indexPath.row + 1, section: indexPath.section)
}
}()
return nextIndexPath
}
var isPrevArticleAvailable: Bool {
guard let articleRow = currentArticleRow else {
return false
}
return articleRow > 0
}
var isNextArticleAvailable: Bool {
guard let articleRow = currentArticleRow else {
return false
}
return articleRow + 1 < articles.count
}
var prevArticle: Article? {
guard isPrevArticleAvailable, let articleRow = currentArticleRow else {
return nil
}
return articles[articleRow - 1]
}
var nextArticle: Article? {
guard isNextArticleAvailable, let articleRow = currentArticleRow else {
return nil
}
return articles[articleRow + 1]
}
var firstUnreadArticleIndexPath: IndexPath? {
for (row, article) in articles.enumerated() {
if !article.status.read {
return IndexPath(row: row, section: 0)
}
}
return nil
}
var currentArticle: Article?
private(set) var articles = ArticleArray()
private var currentArticleRow: Int? {
guard let article = currentArticle else { return nil }
return articles.firstIndex(of: article)
}
var isTimelineUnreadAvailable: Bool {
if let unreadProvider = timelineFetcher as? UnreadCountProvider {
return unreadProvider.unreadCount > 0
}
return false
}
var isAnyUnreadAvailable: Bool {
return appDelegate.unreadCount > 0
}
var unreadCount: Int = 0 {
didSet {
if unreadCount != oldValue {
postUnreadCountDidChangeNotification()
}
}
}
override init() {
super.init()
for section in treeController.rootNode.childNodes {
section.isExpanded = true
shadowTable.append([Node]())
}
rebuildShadowTable()
NotificationCenter.default.addObserver(self, selector: #selector(statusesDidChange(_:)), name: .StatusesDidChange, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(containerChildrenDidChange(_:)), name: .ChildrenDidChange, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(batchUpdateDidPerform(_:)), name: .BatchUpdateDidPerform, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(displayNameDidChange(_:)), name: .DisplayNameDidChange, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(accountStateDidChange(_:)), name: .AccountStateDidChange, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(userDidAddAccount(_:)), name: .UserDidAddAccount, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(userDidDeleteAccount(_:)), name: .UserDidDeleteAccount, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(userDefaultsDidChange(_:)), name: UserDefaults.didChangeNotification, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(accountDidDownloadArticles(_:)), name: .AccountDidDownloadArticles, object: nil)
}
func start(for size: CGSize) -> UIViewController {
rootSplitViewController = RootSplitViewController()
rootSplitViewController.coordinator = self
rootSplitViewController.preferredDisplayMode = .allVisible
rootSplitViewController.viewControllers = [ThemedNavigationController.template()]
rootSplitViewController.delegate = self
masterNavigationController = (rootSplitViewController.viewControllers.first as! UINavigationController)
masterNavigationController.delegate = self
masterFeedViewController = UIStoryboard.main.instantiateController(ofType: MasterFeedViewController.self)
masterFeedViewController.coordinator = self
masterNavigationController.pushViewController(masterFeedViewController, animated: false)
let articleViewController = UIStoryboard.main.instantiateController(ofType: ArticleViewController.self)
articleViewController.coordinator = self
let detailNavigationController = addNavControllerIfNecessary(articleViewController, showButton: true)
rootSplitViewController.showDetailViewController(detailNavigationController, sender: self)
configureThreePanelMode(for: size)
return rootSplitViewController
}
func handle(_ activity: NSUserActivity) {
selectFeed(nil)
guard let activityType = ActivityType(rawValue: activity.activityType) else { return }
switch activityType {
case .selectToday:
handleSelectToday()
case .selectAllUnread:
handleSelectAllUnread()
case .selectStarred:
handleSelectStarred()
case .selectFolder:
handleSelectFolder(activity.userInfo)
case .selectFeed:
handleSelectFeed(activity.userInfo)
case .nextUnread:
selectFirstUnreadInAllUnread()
case .readArticle:
handleReadArticle(activity.userInfo)
case .addFeedIntent:
showAdd(.feed)
}
}
func handle(_ response: UNNotificationResponse) {
let userInfo = response.notification.request.content.userInfo
handleReadArticle(userInfo)
}
func configureThreePanelMode(for size: CGSize) {
guard rootSplitViewController.traitCollection.userInterfaceIdiom == .pad && !rootSplitViewController.isCollapsed else {
return
}
if size.width > size.height {
if !isThreePanelMode {
transitionToThreePanelMode()
}
} else {
if isThreePanelMode {
transitionFromThreePanelMode()
}
}
}
func selectFirstUnreadInAllUnread() {
selectFeed(IndexPath(row: 1, section: 0))
selectFirstUnreadArticleInTimeline()
}
func showSearch() {
selectFeed(nil)
installTimelineControllerIfNecessary(animated: false)
DispatchQueue.main.asyncAfter(deadline: .now()) {
self.masterTimelineViewController!.showSearchAll()
}
}
// MARK: Notifications
@objc func statusesDidChange(_ note: Notification) {
updateUnreadCount()
}
@objc func containerChildrenDidChange(_ note: Notification) {
if timelineFetcherContainsAnyPseudoFeed() || timelineFetcherContainsAnyFolder() {
fetchAndReplaceArticlesAsync() {}
}
rebuildBackingStores()
}
@objc func batchUpdateDidPerform(_ notification: Notification) {
rebuildBackingStores()
}
@objc func displayNameDidChange(_ note: Notification) {
rebuildBackingStores()
}
@objc func accountStateDidChange(_ note: Notification) {
if timelineFetcherContainsAnyPseudoFeed() {
fetchAndReplaceArticlesSync()
}
guard let account = note.userInfo?[Account.UserInfoKey.account] as? Account else {
assertionFailure()
return
}
rebuildBackingStores() {
// If we are activating an account, then automatically expand it
if account.isActive, let node = self.treeController.rootNode.childNodeRepresentingObject(account) {
node.isExpanded = true
}
}
}
@objc func userDidAddAccount(_ note: Notification) {
if timelineFetcherContainsAnyPseudoFeed() {
fetchAndReplaceArticlesSync()
}
rebuildBackingStores() {
// Automatically expand any new accounts
if let account = note.userInfo?[Account.UserInfoKey.account] as? Account,
let node = self.treeController.rootNode.childNodeRepresentingObject(account) {
node.isExpanded = true
}
}
}
@objc func userDidDeleteAccount(_ note: Notification) {
if timelineFetcherContainsAnyPseudoFeed() {
fetchAndReplaceArticlesSync()
}
rebuildBackingStores()
}
@objc func userDefaultsDidChange(_ note: Notification) {
self.sortDirection = AppDefaults.timelineSortDirection
self.groupByFeed = AppDefaults.timelineGroupByFeed
}
@objc func accountDidDownloadArticles(_ note: Notification) {
guard let feeds = note.userInfo?[Account.UserInfoKey.feeds] as? Set<Feed> else {
return
}
let shouldFetchAndMergeArticles = timelineFetcherContainsAnyFeed(feeds) || timelineFetcherContainsAnyPseudoFeed()
if shouldFetchAndMergeArticles {
queueFetchAndMergeArticles()
}
}
// MARK: API
func shadowNodesFor(section: Int) -> [Node] {
return shadowTable[section]
}
func cappedIndexPath(_ indexPath: IndexPath) -> IndexPath {
guard indexPath.section < shadowTable.count && indexPath.row < shadowTable[indexPath.section].count else {
return IndexPath(row: shadowTable[shadowTable.count - 1].count - 1, section: shadowTable.count - 1)
}
return indexPath
}
func unreadCountFor(_ node: Node) -> Int {
// The coordinator supplies the unread count for the currently selected feed node
if let indexPath = currentFeedIndexPath, let selectedNode = nodeFor(indexPath), selectedNode == node {
return unreadCount
}
if let unreadCountProvider = node.representedObject as? UnreadCountProvider {
return unreadCountProvider.unreadCount
}
return 0
}
func expand(_ node: Node) {
node.isExpanded = true
animatingChanges = true
rebuildShadowTable()
animatingChanges = false
}
func expandAllSectionsAndFolders() {
for sectionNode in treeController.rootNode.childNodes {
sectionNode.isExpanded = true
for topLevelNode in sectionNode.childNodes {
if topLevelNode.representedObject is Folder {
topLevelNode.isExpanded = true
}
}
}
animatingChanges = true
rebuildShadowTable()
animatingChanges = false
}
func collapse(_ node: Node) {
node.isExpanded = false
animatingChanges = true
rebuildShadowTable()
animatingChanges = false
}
func collapseAllFolders() {
for sectionNode in treeController.rootNode.childNodes {
sectionNode.isExpanded = true
for topLevelNode in sectionNode.childNodes {
if topLevelNode.representedObject is Folder {
topLevelNode.isExpanded = true
}
}
}
animatingChanges = true
rebuildShadowTable()
animatingChanges = false
}
func masterFeedIndexPathForCurrentTimeline() -> IndexPath? {
guard let node = treeController.rootNode.descendantNodeRepresentingObject(timelineFetcher as AnyObject) else {
return nil
}
return indexPathFor(node)
}
func selectFeed(_ indexPath: IndexPath?, animated: Bool = false) {
guard indexPath != currentFeedIndexPath else { return }
selectArticle(nil)
currentFeedIndexPath = indexPath
masterFeedViewController.updateFeedSelection()
if let ip = indexPath, let node = nodeFor(ip), let fetcher = node.representedObject as? ArticleFetcher {
timelineFetcher = fetcher
updateSelectingActivity(with: node)
installTimelineControllerIfNecessary(animated: animated)
} else {
timelineFetcher = nil
activityManager.invalidateSelecting()
if rootSplitViewController.isCollapsed && navControllerForTimeline().viewControllers.last is MasterTimelineViewController {
navControllerForTimeline().popViewController(animated: animated)
}
}
}
func selectPrevFeed() {
if let indexPath = prevFeedIndexPath {
selectFeed(indexPath)
}
}
func selectNextFeed() {
if let indexPath = nextFeedIndexPath {
selectFeed(indexPath)
}
}
func selectTodayFeed() {
masterFeedViewController?.ensureSectionIsExpanded(0) {
self.selectFeed(IndexPath(row: 0, section: 0))
}
}
func selectAllUnreadFeed() {
masterFeedViewController?.ensureSectionIsExpanded(0) {
self.selectFeed(IndexPath(row: 1, section: 0))
}
}
func selectStarredFeed() {
masterFeedViewController?.ensureSectionIsExpanded(0) {
self.selectFeed(IndexPath(row: 2, section: 0))
}
}
func selectArticle(_ article: Article?, animated: Bool = false) {
guard article != currentArticle else { return }
stopArticleExtractor()
currentArticle = article
activityManager.reading(currentArticle)
if article == nil {
if rootSplitViewController.isCollapsed {
if masterNavigationController.children.last is ArticleViewController {
masterNavigationController.popViewController(animated: animated)
}
} else {
articleViewController?.state = .noSelection
}
masterTimelineViewController?.updateArticleSelection(animated: animated)
return
}
let currentArticleViewController: ArticleViewController
if articleViewController == nil {
currentArticleViewController = UIStoryboard.main.instantiateController(ofType: ArticleViewController.self)
currentArticleViewController.coordinator = self
installArticleController(currentArticleViewController, animated: animated)
} else {
currentArticleViewController = articleViewController!
}
masterTimelineViewController?.updateArticleSelection(animated: animated)
if article!.feed?.isArticleExtractorAlwaysOn ?? false {
startArticleExtractorForCurrentLink()
currentArticleViewController.state = .loading
} else {
currentArticleViewController.state = .article(article!)
}
markArticles(Set([article!]), statusKey: .read, flag: true)
}
func beginSearching() {
isSearching = true
searchArticleIds = Set(articles.map { $0.articleID })
timelineFetcher = nil
}
func endSearching() {
isSearching = false
lastSearchString = ""
lastSearchScope = nil
searchArticleIds = nil
if let ip = currentFeedIndexPath, let node = nodeFor(ip), let fetcher = node.representedObject as? ArticleFetcher {
timelineFetcher = fetcher
} else {
timelineFetcher = nil
}
selectArticle(nil)
}
func searchArticles(_ searchString: String, _ searchScope: SearchScope) {
guard isSearching else { return }
if searchString.count < 3 {
timelineFetcher = nil
return
}
if searchString != lastSearchString || searchScope != lastSearchScope {
switch searchScope {
case .global:
timelineFetcher = SmartFeed(delegate: SearchFeedDelegate(searchString: searchString))
case .timeline:
timelineFetcher = SmartFeed(delegate: SearchTimelineFeedDelegate(searchString: searchString, articleIDs: searchArticleIds!))
}
lastSearchString = searchString
lastSearchScope = searchScope
}
}
func selectPrevArticle() {
if let article = prevArticle {
selectArticle(article)
}
}
func selectNextArticle() {
if let article = nextArticle {
selectArticle(article)
}
}
func selectFirstUnread() {
if selectFirstUnreadArticleInTimeline() {
activityManager.selectingNextUnread()
}
}
func selectPrevUnread() {
// This should never happen, but I don't want to risk throwing us
// into an infinate loop searching for an unread that isn't there.
if appDelegate.unreadCount < 1 {
return
}
if selectPrevUnreadArticleInTimeline() {
return
}
selectPrevUnreadFeedFetcher()
selectPrevUnreadArticleInTimeline()
}
func selectNextUnread() {
// This should never happen, but I don't want to risk throwing us
// into an infinate loop searching for an unread that isn't there.
if appDelegate.unreadCount < 1 {
return
}
if selectNextUnreadArticleInTimeline() {
activityManager.selectingNextUnread()
return
}
selectNextUnreadFeedFetcher()
if selectNextUnreadArticleInTimeline() {
activityManager.selectingNextUnread()
}
}
func scrollOrGoToNextUnread() {
if articleViewController?.canScrollDown() ?? false {
articleViewController?.scrollPageDown()
} else {
selectNextUnread()
}
}
func markAllAsRead(_ articles: [Article]) {
markArticlesWithUndo(articles, statusKey: .read, flag: true)
}
func markAllAsReadInTimeline() {
markAllAsRead(articles)
masterNavigationController.popViewController(animated: true)
}
func markAsReadOlderArticlesInTimeline() {
if let article = currentArticle {
markAsReadOlderArticlesInTimeline(article)
}
}
func markAsReadOlderArticlesInTimeline(_ article: Article) {
let articlesToMark = articles.filter { $0.logicalDatePublished < article.logicalDatePublished }
if articlesToMark.isEmpty {
return
}
markAllAsRead(articlesToMark)
}
func markAsReadForCurrentArticle() {
if let article = currentArticle {
markArticlesWithUndo([article], statusKey: .read, flag: true)
}
}
func markAsUnreadForCurrentArticle() {
if let article = currentArticle {
markArticlesWithUndo([article], statusKey: .read, flag: false)
}
}
func toggleReadForCurrentArticle() {
if let article = currentArticle {
toggleRead(article)
}
}
func toggleRead(_ article: Article) {
markArticlesWithUndo([article], statusKey: .read, flag: !article.status.read)
}
func toggleStarredForCurrentArticle() {
if let article = currentArticle {
toggleStar(article)
}
}
func toggleStar(_ article: Article) {
markArticlesWithUndo([article], statusKey: .starred, flag: !article.status.starred)
}
func discloseFeed(_ feed: Feed, animated: Bool, completion: (() -> Void)? = nil) {
masterFeedViewController.discloseFeed(feed, animated: animated) {
completion?()
}
}
func showSettings() {
let settingsNavController = UIStoryboard.settings.instantiateInitialViewController() as! UINavigationController
let settingsViewController = settingsNavController.topViewController as! SettingsViewController
settingsNavController.modalPresentationStyle = .formSheet
settingsViewController.presentingParentController = rootSplitViewController
rootSplitViewController.present(settingsNavController, animated: true)
}
func showAccountInspector(for account: Account) {
let accountInspectorNavController =
UIStoryboard.inspector.instantiateViewController(identifier: "AccountInspectorNavigationViewController") as! UINavigationController
let accountInspectorController = accountInspectorNavController.topViewController as! AccountInspectorViewController
accountInspectorNavController.modalPresentationStyle = .formSheet
accountInspectorNavController.preferredContentSize = AccountInspectorViewController.preferredContentSizeForFormSheetDisplay
accountInspectorController.isModal = true
accountInspectorController.account = account
rootSplitViewController.present(accountInspectorNavController, animated: true)
}
func showFeedInspector() {
guard let feed = timelineFetcher as? Feed else {
return
}
showFeedInspector(for: feed)
}
func showFeedInspector(for feed: Feed) {
let feedInspectorNavController =
UIStoryboard.inspector.instantiateViewController(identifier: "FeedInspectorNavigationViewController") as! UINavigationController
let feedInspectorController = feedInspectorNavController.topViewController as! FeedInspectorViewController
feedInspectorController.modalPresentationStyle = .formSheet
feedInspectorController.preferredContentSize = FeedInspectorViewController.preferredContentSizeForFormSheetDisplay
feedInspectorController.feed = feed
rootSplitViewController.present(feedInspectorNavController, animated: true)
}
func showAdd(_ type: AddControllerType, initialFeed: String? = nil, initialFeedName: String? = nil) {
selectFeed(nil)
let addViewController = UIStoryboard.add.instantiateInitialViewController() as! UINavigationController
let containerController = addViewController.topViewController as! AddContainerViewController
containerController.initialControllerType = type
containerController.initialFeed = initialFeed
containerController.initialFeedName = initialFeedName
addViewController.modalPresentationStyle = .formSheet
addViewController.preferredContentSize = AddContainerViewController.preferredContentSizeForFormSheetDisplay
masterFeedViewController.present(addViewController, animated: true)
}
func showFullScreenImage(image: UIImage, transitioningDelegate: UIViewControllerTransitioningDelegate) {
let imageVC = UIStoryboard.main.instantiateController(ofType: ImageViewController.self)
imageVC.image = image
imageVC.modalPresentationStyle = .currentContext
imageVC.transitioningDelegate = transitioningDelegate
rootSplitViewController.present(imageVC, animated: true)
}
func toggleArticleExtractor() {
guard let article = currentArticle else {
return
}
guard articleExtractor?.state != .processing else {
stopArticleExtractor()
articleViewController?.state = .article(article)
return
}
guard !isShowingExtractedArticle else {
isShowingExtractedArticle = false
articleViewController?.articleExtractorButtonState = .off
articleViewController?.state = .article(article)
return
}
if let articleExtractor = articleExtractor, let extractedArticle = articleExtractor.article {
if currentArticle?.preferredLink == articleExtractor.articleLink {
isShowingExtractedArticle = true
articleViewController?.articleExtractorButtonState = .on
articleViewController?.state = .extracted(article, extractedArticle)
}
} else {
startArticleExtractorForCurrentLink()
}
}
func homePageURLForFeed(_ indexPath: IndexPath) -> URL? {
guard let node = nodeFor(indexPath),
let feed = node.representedObject as? Feed,
let homePageURL = feed.homePageURL,
let url = URL(string: homePageURL) else {
return nil
}
return url
}
func showBrowserForFeed(_ indexPath: IndexPath) {
if let url = homePageURLForFeed(indexPath) {
UIApplication.shared.open(url, options: [:])
}
}
func showBrowserForCurrentFeed() {
if let ip = currentFeedIndexPath, let url = homePageURLForFeed(ip) {
UIApplication.shared.open(url, options: [:])
}
}
func showBrowserForArticle(_ article: Article) {
guard let preferredLink = article.preferredLink, let url = URL(string: preferredLink) else {
return
}
UIApplication.shared.open(url, options: [:])
}
func showBrowserForCurrentArticle() {
guard let preferredLink = currentArticle?.preferredLink, let url = URL(string: preferredLink) else {
return
}
UIApplication.shared.open(url, options: [:])
}
func navigateToFeeds() {
masterFeedViewController?.focus()
selectArticle(nil)
}
func navigateToTimeline() {
if currentArticle == nil && articles.count > 0 {
selectArticle(articles[0])
}
masterTimelineViewController?.focus()
}
func navigateToDetail() {
articleViewController?.focus()
}
}
// MARK: UISplitViewControllerDelegate
extension SceneCoordinator: UISplitViewControllerDelegate {
func splitViewController(_ splitViewController: UISplitViewController, collapseSecondary secondaryViewController:UIViewController, onto primaryViewController:UIViewController) -> Bool {
return currentArticle == nil
}
func splitViewController(_ splitViewController: UISplitViewController, separateSecondaryFrom primaryViewController: UIViewController) -> UIViewController? {
if currentArticle == nil {
let articleViewController = UIStoryboard.main.instantiateController(ofType: ArticleViewController.self)
articleViewController.coordinator = self
return articleViewController
}
return nil
}
}
// MARK: UINavigationControllerDelegate
extension SceneCoordinator: UINavigationControllerDelegate {
func navigationController(_ navigationController: UINavigationController, didShow viewController: UIViewController, animated: Bool) {
if UIApplication.shared.applicationState == .background {
return
}
// If we are showing the Feeds and only the feeds start clearing stuff
if viewController === masterFeedViewController && !isThreePanelMode && !isTimelineViewControllerPending {
activityManager.invalidateCurrentActivities()
selectFeed(nil)
return
}
if viewController is MasterTimelineViewController {
isTimelineViewControllerPending = false
}
// If we are using a phone and navigate away from the detail, clear up the article resources (including activity).
// Don't clear it if we have pushed an ArticleViewController, but don't yet see it on the navigation stack.
// This happens when we are going to the next unread and we need to grab another timeline to continue. The
// ArticleViewController will be pushed, but we will breifly show the Timeline. Don't clear things out when that happens.
if viewController === masterTimelineViewController && !isThreePanelMode && rootSplitViewController.isCollapsed && !isArticleViewControllerPending {
stopArticleExtractor()
currentArticle = nil
masterTimelineViewController?.updateArticleSelection(animated: animated)
activityManager.invalidateReading()
return
}
if viewController is ArticleViewController {
isArticleViewControllerPending = false
}
}
}
// MARK: ArticleExtractorDelegate
extension SceneCoordinator: ArticleExtractorDelegate {
func articleExtractionDidFail(with: Error) {
stopArticleExtractor()
articleViewController?.articleExtractorButtonState = .error
}
func articleExtractionDidComplete(extractedArticle: ExtractedArticle) {
if let article = currentArticle, articleExtractor?.state != .cancelled {
isShowingExtractedArticle = true
articleViewController?.state = .extracted(article, extractedArticle)
articleViewController?.articleExtractorButtonState = .on
}
}
}
// MARK: Private
private extension SceneCoordinator {
func markArticlesWithUndo(_ articles: [Article], statusKey: ArticleStatus.Key, flag: Bool) {
guard let undoManager = undoManager, let markReadCommand = MarkStatusCommand(initialArticles: articles, statusKey: statusKey, flag: flag, undoManager: undoManager) else {
return
}
runCommand(markReadCommand)
}
func updateUnreadCount() {
var count = 0
for article in articles {
if !article.status.read {
count += 1
}
}
unreadCount = count
}
func rebuildBackingStores(_ updateExpandedNodes: (() -> Void)? = nil) {
if !animatingChanges && !BatchUpdate.shared.isPerforming {
treeController.rebuild()
updateExpandedNodes?()
rebuildShadowTable()
masterFeedViewController.reloadFeeds()
}
}
func rebuildShadowTable() {
shadowTable = [[Node]]()
for i in 0..<treeController.rootNode.numberOfChildNodes {
var result = [Node]()
let sectionNode = treeController.rootNode.childAtIndex(i)!
if sectionNode.isExpanded {
for node in sectionNode.childNodes {
result.append(node)
if node.isExpanded {
for child in node.childNodes {
result.append(child)
}
}
}
}
shadowTable.append(result)
}
}
func nodeFor(_ indexPath: IndexPath) -> Node? {
guard indexPath.section < shadowTable.count && indexPath.row < shadowTable[indexPath.section].count else {
return nil
}
return shadowTable[indexPath.section][indexPath.row]
}
func indexPathFor(_ node: Node) -> IndexPath? {
for i in 0..<shadowTable.count {
if let row = shadowTable[i].firstIndex(of: node) {
return IndexPath(row: row, section: i)
}
}
return nil
}
func indexPathFor(_ object: AnyObject) -> IndexPath? {
guard let node = treeController.rootNode.descendantNodeRepresentingObject(object) else {
return nil
}
return indexPathFor(node)
}
func updateShowIcons() {
if showFeedNames {
self.showIcons = true
return
}
for article in articles {
if let authors = article.authors {
for author in authors {
if author.avatarURL != nil {
self.showIcons = true
return
}
}
}
}
self.showIcons = false
}
// MARK: Select Prev Unread
@discardableResult
func selectPrevUnreadArticleInTimeline() -> Bool {
let startingRow: Int = {
if let articleRow = currentArticleRow {
return articleRow
} else {
return articles.count - 1
}
}()
return selectPrevArticleInTimeline(startingRow: startingRow)
}
func selectPrevArticleInTimeline(startingRow: Int) -> Bool {
guard startingRow >= 0 else {
return false
}
for i in (0...startingRow).reversed() {
let article = articles[i]
if !article.status.read {
selectArticle(article)
return true
}
}
return false
}
func selectPrevUnreadFeedFetcher() {
let indexPath: IndexPath = {
if currentFeedIndexPath == nil {
return IndexPath(row: 0, section: 0)
} else {
return currentFeedIndexPath!
}
}()
// Increment or wrap around the IndexPath
let nextIndexPath: IndexPath = {
if indexPath.row - 1 < 0 {
if indexPath.section - 1 < 0 {
return IndexPath(row: shadowTable[shadowTable.count - 1].count - 1, section: shadowTable.count - 1)
} else {
return IndexPath(row: shadowTable[indexPath.section - 1].count - 1, section: indexPath.section - 1)
}
} else {
return IndexPath(row: indexPath.row - 1, section: indexPath.section)
}
}()
if selectPrevUnreadFeedFetcher(startingWith: nextIndexPath) {
return
}
let maxIndexPath = IndexPath(row: shadowTable[shadowTable.count - 1].count - 1, section: shadowTable.count - 1)
selectPrevUnreadFeedFetcher(startingWith: maxIndexPath)
}
@discardableResult
func selectPrevUnreadFeedFetcher(startingWith indexPath: IndexPath) -> Bool {
for i in (0...indexPath.section).reversed() {
let startingRow: Int = {
if indexPath.section == i {
return indexPath.row
} else {
return shadowTable[i].count - 1
}
}()
for j in (0...startingRow).reversed() {
let prevIndexPath = IndexPath(row: j, section: i)
guard let node = nodeFor(prevIndexPath), let unreadCountProvider = node.representedObject as? UnreadCountProvider else {
assertionFailure()
return true
}
if node.isExpanded {
continue
}
if unreadCountProvider.unreadCount > 0 {
selectFeed(prevIndexPath)
return true
}
}
}
return false
}
// MARK: Select Next Unread
@discardableResult
func selectFirstUnreadArticleInTimeline() -> Bool {
return selectNextArticleInTimeline(startingRow: 0, animated: true)
}
@discardableResult
func selectNextUnreadArticleInTimeline() -> Bool {
let startingRow: Int = {
if let articleRow = currentArticleRow {
return articleRow + 1
} else {
return 0
}
}()
return selectNextArticleInTimeline(startingRow: startingRow, animated: false)
}
func selectNextArticleInTimeline(startingRow: Int, animated: Bool) -> Bool {
guard startingRow < articles.count else {
return false
}
for i in startingRow..<articles.count {
let article = articles[i]
if !article.status.read {
selectArticle(article, animated: animated)
return true
}
}
return false
}
func selectNextUnreadFeedFetcher() {
let indexPath: IndexPath = {
if currentFeedIndexPath == nil {
return IndexPath(row: -1, section: 0)
} else {
return currentFeedIndexPath!
}
}()
// Increment or wrap around the IndexPath
let nextIndexPath: IndexPath = {
if indexPath.row + 1 >= shadowTable[indexPath.section].count {
if indexPath.section + 1 >= shadowTable.count {
return IndexPath(row: 0, section: 0)
} else {
return IndexPath(row: 0, section: indexPath.section + 1)
}
} else {
return IndexPath(row: indexPath.row + 1, section: indexPath.section)
}
}()
if selectNextUnreadFeedFetcher(startingWith: nextIndexPath) {
return
}
selectNextUnreadFeedFetcher(startingWith: IndexPath(row: 0, section: 0))
}
@discardableResult
func selectNextUnreadFeedFetcher(startingWith indexPath: IndexPath) -> Bool {
for i in indexPath.section..<shadowTable.count {
let startingRow: Int = {
if indexPath.section == i {
return indexPath.row
} else {
return 0
}
}()
for j in startingRow..<shadowTable[indexPath.section].count {
let nextIndexPath = IndexPath(row: j, section: i)
guard let node = nodeFor(nextIndexPath), let unreadCountProvider = node.representedObject as? UnreadCountProvider else {
assertionFailure()
return true
}
if node.isExpanded {
continue
}
if unreadCountProvider.unreadCount > 0 {
selectFeed(nextIndexPath)
return true
}
}
}
return false
}
// MARK: Fetching Articles
func startArticleExtractorForCurrentLink() {
if let link = currentArticle?.preferredLink, let extractor = ArticleExtractor(link) {
extractor.delegate = self
extractor.process()
articleExtractor = extractor
articleViewController?.articleExtractorButtonState = .animated
}
}
func stopArticleExtractor() {
articleExtractor?.cancel()
articleExtractor = nil
isShowingExtractedArticle = false
articleViewController?.articleExtractorButtonState = .off
}
func emptyTheTimeline() {
if !articles.isEmpty {
replaceArticles(with: Set<Article>(), animate: true)
}
}
func sortParametersDidChange() {
replaceArticles(with: Set(articles), animate: true)
}
func replaceArticles(with unsortedArticles: Set<Article>, animate: Bool) {
let sortedArticles = Array(unsortedArticles).sortedByDate(sortDirection, groupByFeed: groupByFeed)
if articles != sortedArticles {
articles = sortedArticles
updateShowIcons()
updateUnreadCount()
masterTimelineViewController?.reloadArticles(animate: animate)
}
}
func queueFetchAndMergeArticles() {
fetchAndMergeArticlesQueue.add(self, #selector(fetchAndMergeArticles))
}
@objc func fetchAndMergeArticles() {
guard let timelineFetcher = timelineFetcher else {
return
}
fetchUnsortedArticlesAsync(for: [timelineFetcher]) { [weak self] (unsortedArticles) in
// Merge articles by articleID. For any unique articleID in current articles, add to unsortedArticles.
guard let strongSelf = self else {
return
}
let unsortedArticleIDs = unsortedArticles.articleIDs()
var updatedArticles = unsortedArticles
for article in strongSelf.articles {
if !unsortedArticleIDs.contains(article.articleID) {
updatedArticles.insert(article)
}
}
strongSelf.replaceArticles(with: updatedArticles, animate: true)
}
}
func cancelPendingAsyncFetches() {
fetchSerialNumber += 1
fetchRequestQueue.cancelAllRequests()
}
func fetchAndReplaceArticlesSync() {
// To be called when the user has made a change of selection in the sidebar.
// It blocks the main thread, so that theres no async delay,
// so that the entire display refreshes at once.
// Its a better user experience this way.
cancelPendingAsyncFetches()
guard let timelineFetcher = timelineFetcher else {
emptyTheTimeline()
return
}
let fetchedArticles = fetchUnsortedArticlesSync(for: [timelineFetcher])
replaceArticles(with: fetchedArticles, animate: false)
}
func fetchAndReplaceArticlesAsync(completion: @escaping () -> Void) {
// To be called when we need to do an entire fetch, but an async delay is okay.
// Example: we have the Today feed selected, and the calendar day just changed.
cancelPendingAsyncFetches()
guard let timelineFetcher = timelineFetcher else {
emptyTheTimeline()
return
}
fetchUnsortedArticlesAsync(for: [timelineFetcher]) { [weak self] (articles) in
self?.replaceArticles(with: articles, animate: true)
completion()
}
}
func fetchUnsortedArticlesSync(for representedObjects: [Any]) -> Set<Article> {
cancelPendingAsyncFetches()
let articleFetchers = representedObjects.compactMap{ $0 as? ArticleFetcher }
if articleFetchers.isEmpty {
return Set<Article>()
}
var fetchedArticles = Set<Article>()
for articleFetcher in articleFetchers {
fetchedArticles.formUnion(articleFetcher.fetchArticles())
}
return fetchedArticles
}
func fetchUnsortedArticlesAsync(for representedObjects: [Any], callback: @escaping ArticleSetBlock) {
// The callback will *not* be called if the fetch is no longer relevant that is,
// if its been superseded by a newer fetch, or the timeline was emptied, etc., it wont get called.
precondition(Thread.isMainThread)
cancelPendingAsyncFetches()
let fetchOperation = FetchRequestOperation(id: fetchSerialNumber, representedObjects: representedObjects) { [weak self] (articles, operation) in
precondition(Thread.isMainThread)
guard !operation.isCanceled, let strongSelf = self, operation.id == strongSelf.fetchSerialNumber else {
return
}
callback(articles)
}
fetchRequestQueue.add(fetchOperation)
}
func timelineFetcherContainsAnyPseudoFeed() -> Bool {
if timelineFetcher is PseudoFeed {
return true
}
return false
}
func timelineFetcherContainsAnyFolder() -> Bool {
if timelineFetcher is Folder {
return true
}
return false
}
func timelineFetcherContainsAnyFeed(_ feeds: Set<Feed>) -> Bool {
// Return true if theres a match or if a folder contains (recursively) one of feeds
if let feed = timelineFetcher as? Feed {
for oneFeed in feeds {
if feed.feedID == oneFeed.feedID || feed.url == oneFeed.url {
return true
}
}
} else if let folder = timelineFetcher as? Folder {
for oneFeed in feeds {
if folder.hasFeed(with: oneFeed.feedID) || folder.hasFeed(withURL: oneFeed.url) {
return true
}
}
}
return false
}
// MARK: Double Split
func installTimelineControllerIfNecessary(animated: Bool) {
isTimelineViewControllerPending = true
if navControllerForTimeline().viewControllers.filter({ $0 is MasterTimelineViewController }).count < 1 {
masterTimelineViewController = UIStoryboard.main.instantiateController(ofType: MasterTimelineViewController.self)
masterTimelineViewController!.coordinator = self
navControllerForTimeline().pushViewController(masterTimelineViewController!, animated: animated)
}
}
func installArticleController(_ articleController: UIViewController, animated: Bool) {
isArticleViewControllerPending = true
if let subSplit = subSplitViewController {
let controller = addNavControllerIfNecessary(articleController, showButton: false)
subSplit.showDetailViewController(controller, sender: self)
} else if rootSplitViewController.isCollapsed {
let controller = addNavControllerIfNecessary(articleController, showButton: false)
masterNavigationController.pushViewController(controller, animated: animated)
} else {
let controller = addNavControllerIfNecessary(articleController, showButton: true)
rootSplitViewController.showDetailViewController(controller, sender: self)
}
}
func addNavControllerIfNecessary(_ controller: UIViewController, showButton: Bool) -> UIViewController {
if rootSplitViewController.isCollapsed {
return controller
} else {
let navController = ThemedNavigationController.template(rootViewController: controller)
navController.isToolbarHidden = false
if showButton {
controller.navigationItem.leftBarButtonItem = rootSplitViewController.displayModeButtonItem
controller.navigationItem.leftItemsSupplementBackButton = true
} else {
controller.navigationItem.leftBarButtonItem = nil
controller.navigationItem.leftItemsSupplementBackButton = false
}
return navController
}
}
func configureDoubleSplit() {
rootSplitViewController.preferredPrimaryColumnWidthFraction = 0.30
let subSplit = UISplitViewController.template()
subSplit.preferredDisplayMode = .allVisible
subSplit.preferredPrimaryColumnWidthFraction = 0.4285
rootSplitViewController.showDetailViewController(subSplit, sender: self)
}
func navControllerForTimeline() -> UINavigationController {
if let subSplit = subSplitViewController {
return subSplit.viewControllers.first as! UINavigationController
} else {
return masterNavigationController
}
}
@discardableResult
func transitionToThreePanelMode() -> UIViewController {
defer {
masterNavigationController.viewControllers = [masterFeedViewController]
}
let controller: UIViewController = {
if let result = articleViewController {
return result
} else {
let articleViewController = UIStoryboard.main.instantiateController(ofType: ArticleViewController.self)
articleViewController.coordinator = self
return articleViewController
}
}()
configureDoubleSplit()
installTimelineControllerIfNecessary(animated: false)
masterTimelineViewController?.navigationItem.leftBarButtonItem = rootSplitViewController.displayModeButtonItem
masterTimelineViewController?.navigationItem.leftItemsSupplementBackButton = true
// Create the new sub split controller and add the timeline in the primary position
let masterTimelineNavController = subSplitViewController!.viewControllers.first as! UINavigationController
masterTimelineNavController.viewControllers = [masterTimelineViewController!]
// Put the detail or no selection controller in the secondary (or detail) position of the sub split
let navController = addNavControllerIfNecessary(controller, showButton: false)
subSplitViewController!.showDetailViewController(navController, sender: self)
masterFeedViewController.restoreSelectionIfNecessary(adjustScroll: true)
masterTimelineViewController!.restoreSelectionIfNecessary(adjustScroll: false)
// We made sure this was there above when we called configureDoubleSplit
return subSplitViewController!
}
func transitionFromThreePanelMode() {
rootSplitViewController.preferredPrimaryColumnWidthFraction = UISplitViewController.automaticDimension
if let subSplit = rootSplitViewController.viewControllers.last as? UISplitViewController {
// Push a new timeline on to the master navigation controller. For some reason recycling the timeline can freak
// the system out and throw it into an infinite loop.
if currentFeedIndexPath != nil {
masterTimelineViewController = UIStoryboard.main.instantiateController(ofType: MasterTimelineViewController.self)
masterTimelineViewController!.coordinator = self
masterNavigationController.pushViewController(masterTimelineViewController!, animated: false)
}
// Pull the detail or no selection controller out of the sub split second position and move it to the root split controller
// secondary (detail) position.
if let detailNav = subSplit.viewControllers.last as? UINavigationController, let topController = detailNav.topViewController {
let newNav = addNavControllerIfNecessary(topController, showButton: true)
rootSplitViewController.showDetailViewController(newNav, sender: self)
}
}
}
// MARK: NSUserActivity
func updateSelectingActivity(with node: Node) {
switch true {
case node.representedObject === SmartFeedsController.shared.todayFeed:
activityManager.selectingToday()
case node.representedObject === SmartFeedsController.shared.unreadFeed:
activityManager.selectingAllUnread()
case node.representedObject === SmartFeedsController.shared.starredFeed:
activityManager.selectingStarred()
case node.representedObject is Folder:
activityManager.selectingFolder(node.representedObject as! Folder)
case node.representedObject is Feed:
activityManager.selectingFeed(node.representedObject as! Feed)
default:
break
}
}
func handleSelectToday() {
if let indexPath = indexPathFor(SmartFeedsController.shared.todayFeed) {
selectFeed(indexPath)
}
}
func handleSelectAllUnread() {
if let indexPath = indexPathFor(SmartFeedsController.shared.unreadFeed) {
selectFeed(indexPath)
}
}
func handleSelectStarred() {
if let indexPath = indexPathFor(SmartFeedsController.shared.starredFeed) {
selectFeed(indexPath)
}
}
func handleSelectFolder(_ userInfo: [AnyHashable : Any]?) {
guard let accountNode = findAccountNode(userInfo), let folderNode = findFolderNode(userInfo, beginningAt: accountNode) else {
return
}
if let indexPath = indexPathFor(folderNode) {
selectFeed(indexPath)
}
}
func handleSelectFeed(_ userInfo: [AnyHashable : Any]?) {
guard let accountNode = findAccountNode(userInfo), let feedNode = findFeedNode(userInfo, beginningAt: accountNode) else {
return
}
if let feed = feedNode.representedObject as? Feed {
discloseFeed(feed, animated: false)
}
}
func handleReadArticle(_ userInfo: [AnyHashable : Any]?) {
guard let accountNode = findAccountNode(userInfo), let feedNode = findFeedNode(userInfo, beginningAt: accountNode) else {
return
}
discloseFeed(feedNode.representedObject as! Feed, animated: false) {
guard let articleID = userInfo?[DeepLinkKey.articleID.rawValue] as? String else { return }
if let article = self.articles.first(where: { $0.articleID == articleID }) {
self.selectArticle(article)
}
}
}
func findAccountNode(_ userInfo: [AnyHashable : Any]?) -> Node? {
guard let accountID = userInfo?[DeepLinkKey.accountID.rawValue] as? String else {
return nil
}
if let node = treeController.rootNode.descendantNode(where: { ($0.representedObject as? Account)?.accountID == accountID }) {
return node
}
guard let accountName = userInfo?[DeepLinkKey.accountName.rawValue] as? String else {
return nil
}
if let node = treeController.rootNode.descendantNode(where: { ($0.representedObject as? Account)?.nameForDisplay == accountName }) {
return node
}
return nil
}
func findFolderNode(_ userInfo: [AnyHashable : Any]?, beginningAt startingNode: Node) -> Node? {
guard let folderName = userInfo?[DeepLinkKey.folderName.rawValue] as? String else {
return nil
}
if let node = startingNode.descendantNode(where: { ($0.representedObject as? Folder)?.nameForDisplay == folderName }) {
return node
}
return nil
}
func findFeedNode(_ userInfo: [AnyHashable : Any]?, beginningAt startingNode: Node) -> Node? {
guard let feedID = userInfo?[DeepLinkKey.feedID.rawValue] as? String else {
return nil
}
if let node = startingNode.descendantNode(where: { ($0.representedObject as? Feed)?.feedID == feedID }) {
return node
}
return nil
}
}