Reuse conversation tree where possible when selecting a status in a conversation
This commit is contained in:
parent
a314521b96
commit
7cadcf1e86
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@ -45,11 +45,15 @@ class ConversationCollectionViewController: UIViewController, CollectionViewCont
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(collectionView.cellForItem(at: $0) as? TimelineStatusCollectionViewCell)?.trailingSwipeActions()
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}
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config.itemSeparatorHandler = { [unowned self] indexPath, sectionConfig in
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let rowsInSection = self.collectionView.numberOfItems(inSection: indexPath.section)
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let lastInSection = indexPath.row == rowsInSection - 1
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var config = sectionConfig
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config.topSeparatorVisibility = .hidden
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config.bottomSeparatorVisibility = lastInSection ? .visible : .hidden
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if case .ancestors = self.dataSource.sectionIdentifier(for: indexPath.section) {
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config.bottomSeparatorVisibility = .hidden
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} else if indexPath.row == self.collectionView.numberOfItems(inSection: indexPath.section) - 1 {
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config.bottomSeparatorVisibility = .visible
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} else {
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config.bottomSeparatorVisibility = .hidden
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}
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config.bottomSeparatorInsets = TimelineStatusCollectionViewCell.separatorInsets
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return config
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}
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@ -89,7 +93,7 @@ class ConversationCollectionViewController: UIViewController, CollectionViewCont
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}
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return UICollectionViewDiffableDataSource(collectionView: collectionView) { [unowned self] collectionView, indexPath, itemIdentifier in
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switch itemIdentifier {
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case let .status(id: id, state: state, prevLink: prevLink, nextLink: nextLink):
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case let .status(id: id, node: _, state: state, prevLink: prevLink, nextLink: nextLink):
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if id == self.mainStatusID {
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return collectionView.dequeueConfiguredReusableCell(using: mainStatusCell, for: indexPath, item: (id, state, prevLink))
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} else {
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@ -113,36 +117,28 @@ class ConversationCollectionViewController: UIViewController, CollectionViewCont
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loadViewIfNeeded()
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var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
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snapshot.appendSections([.statuses])
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snapshot.appendSections([.ancestors, .mainStatus])
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if status.inReplyToID != nil {
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snapshot.appendItems([.loadingIndicator], toSection: .statuses)
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snapshot.appendItems([.loadingIndicator], toSection: .ancestors)
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}
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let mainStatusItem = Item.status(id: mainStatusID, state: mainStatusState, prevLink: status.inReplyToID != nil, nextLink: false)
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snapshot.appendItems([mainStatusItem], toSection: .statuses)
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// this will be replace with the actual node in the tree once it's loaded
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let tempMainNode = ConversationNode(status: status)
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let mainStatusItem = Item.status(id: mainStatusID, node: tempMainNode, state: mainStatusState, prevLink: status.inReplyToID != nil, nextLink: false)
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snapshot.appendItems([mainStatusItem], toSection: .mainStatus)
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dataSource.apply(snapshot, animatingDifferences: false)
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}
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func addContext(_ context: ConversationContext, for mainStatus: StatusMO) async {
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await mastodonController.persistentContainer.addAll(statuses: context.ancestors + context.descendants)
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// fetch all descendant status managed objects
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let descendantIDs = context.descendants.map(\.id)
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let request = StatusMO.fetchRequest()
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request.predicate = NSPredicate(format: "id IN %@", descendantIDs)
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let descendants = try? mastodonController.persistentContainer.viewContext.fetch(request)
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let tree = ConversationTree.build(from: context, mainStatus: mainStatus, descendants: descendants ?? [])
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func addTree(_ tree: ConversationTree, mainStatus: StatusMO) {
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var snapshot = dataSource.snapshot()
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snapshot.deleteItems([.loadingIndicator])
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let mainStatusItem = Item.status(id: mainStatusID, state: mainStatusState, prevLink: mainStatus.inReplyToID != nil, nextLink: false)
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let parentItems = tree.ancestors.enumerated().map { index, id in
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Item.status(id: id, state: .unknown, prevLink: index > 0, nextLink: true)
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let mainStatusItem = Item.status(id: mainStatusID, node: tree.mainStatus, state: mainStatusState, prevLink: mainStatus.inReplyToID != nil, nextLink: false)
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let parentItems = tree.ancestors.enumerated().map { index, node in
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Item.status(id: node.status.id, node: node, state: .unknown, prevLink: index > 0, nextLink: true)
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}
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snapshot.insertItems(parentItems, beforeItem: mainStatusItem)
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snapshot.appendItems(parentItems, toSection: .ancestors)
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snapshot.reloadItems([mainStatusItem])
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// convert sub-threads into items for section and add to snapshot
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@ -156,7 +152,7 @@ class ConversationCollectionViewController: UIViewController, CollectionViewCont
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position = .centeredVertically
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} else {
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item = snapshot.itemIdentifiers.first {
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if case .status(id: self.statusIDToScrollToOnLoad, _, _, _) = $0 {
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if case .status(id: self.statusIDToScrollToOnLoad, _, _, _, _) = $0 {
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return true
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} else {
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return false
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@ -185,7 +181,7 @@ class ConversationCollectionViewController: UIViewController, CollectionViewCont
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for node in childThreads {
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let section = Section.childThread(firstStatusID: node.status.id)
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snapshot.appendSections([section])
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snapshot.appendItems([.status(id: node.status.id, state: .unknown, prevLink: false, nextLink: !node.children.isEmpty)], toSection: section)
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snapshot.appendItems([.status(id: node.status.id, node: node, state: .unknown, prevLink: false, nextLink: !node.children.isEmpty)], toSection: section)
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var currentNode = node
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while true {
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@ -208,7 +204,7 @@ class ConversationCollectionViewController: UIViewController, CollectionViewCont
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}
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currentNode = next
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snapshot.appendItems([.status(id: next.status.id, state: .unknown, prevLink: true, nextLink: !next.children.isEmpty)], toSection: section)
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snapshot.appendItems([.status(id: next.status.id, node: next, state: .unknown, prevLink: true, nextLink: !next.children.isEmpty)], toSection: section)
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}
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}
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}
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@ -217,7 +213,7 @@ class ConversationCollectionViewController: UIViewController, CollectionViewCont
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var snapshot = dataSource.snapshot()
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var cellsToMask: [StatusCollectionViewCell] = []
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for item in snapshot.itemIdentifiers {
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guard case .status(id: _, state: let state, prevLink: _, nextLink: _) = item,
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guard case .status(id: _, node: _, state: let state, prevLink: _, nextLink: _) = item,
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state.collapsible == true else {
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continue
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}
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@ -248,17 +244,18 @@ class ConversationCollectionViewController: UIViewController, CollectionViewCont
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extension ConversationCollectionViewController {
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enum Section: Hashable {
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case statuses
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case ancestors
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case mainStatus
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case childThread(firstStatusID: String)
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}
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enum Item: Hashable {
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case status(id: String, state: CollapseState, prevLink: Bool, nextLink: Bool)
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case status(id: String, node: ConversationNode, state: CollapseState, prevLink: Bool, nextLink: Bool)
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case expandThread(childThreads: [ConversationNode], inline: Bool)
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case loadingIndicator
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static func ==(lhs: Item, rhs: Item) -> Bool {
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switch (lhs, rhs) {
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case let (.status(id: a, state: _, prevLink: aPrev, nextLink: aNext), .status(id: b, state: _, prevLink: bPrev, nextLink: bNext)):
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case let (.status(id: a, node: _, state: _, prevLink: aPrev, nextLink: aNext), .status(id: b, node: _, state: _, prevLink: bPrev, nextLink: bNext)):
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return a == b && aPrev == bPrev && aNext == bNext
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case let (.expandThread(childThreads: a, inline: aInline), .expandThread(childThreads: b, inline: bInline)):
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return a.count == b.count && zip(a, b).allSatisfy { $0.status.id == $1.status.id } && aInline == bInline
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@ -271,7 +268,7 @@ extension ConversationCollectionViewController {
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func hash(into hasher: inout Hasher) {
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switch self {
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case let .status(id: id, state: _, prevLink: prevLink, nextLink: nextLink):
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case let .status(id: id, node: _, state: _, prevLink: prevLink, nextLink: nextLink):
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hasher.combine(0)
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hasher.combine(id)
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hasher.combine(prevLink)
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@ -292,7 +289,7 @@ extension ConversationCollectionViewController {
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extension ConversationCollectionViewController: UICollectionViewDelegate {
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func collectionView(_ collectionView: UICollectionView, shouldSelectItemAt indexPath: IndexPath) -> Bool {
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switch dataSource.itemIdentifier(for: indexPath) {
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case .status(id: let id, state: _, prevLink: _, nextLink: _):
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case .status(id: let id, node: _, state: _, prevLink: _, nextLink: _):
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return id != mainStatusID
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case .expandThread(childThreads: _, inline: _):
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return true
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@ -307,12 +304,24 @@ extension ConversationCollectionViewController: UICollectionViewDelegate {
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break
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case .loadingIndicator:
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break
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case .status(id: let id, state: let state, _, _):
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selected(status: id, state: state.copy())
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case .status(id: let id, node: let node, state: let state, _, _):
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// we can only take the fast path if the user tapped on a descendant status.
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// if the current main status is C, or one of its descendants, and the user taps A, then B won't be loaded:
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// A
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// / \
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// B C
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if case .childThread(_) = dataSource.sectionIdentifier(for: indexPath.section) {
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let tree = ConversationTree(ancestors: buildNewAncestors(above: indexPath), mainStatus: node)
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let conv = ConversationViewController(preloadedTree: tree, state: state.copy(), mastodonController: mastodonController)
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conv.showStatusesAutomatically = showStatusesAutomatically
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show(conv)
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} else {
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selected(status: id, state: state.copy())
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}
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case .expandThread(childThreads: let childThreads, inline: _):
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if case .status(id: let id, state: let state, _, _) = dataSource.itemIdentifier(for: IndexPath(row: indexPath.row - 1, section: indexPath.section)) {
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// todo: it would be nice to avoid re-fetching the context here, since we should have all the necessary information already
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let conv = ConversationViewController(for: id, state: state.copy(), mastodonController: mastodonController)
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if case .status(id: _, node: let node, state: let state, _, _) = dataSource.itemIdentifier(for: IndexPath(row: indexPath.row - 1, section: indexPath.section)) {
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let tree = ConversationTree(ancestors: buildNewAncestors(above: indexPath), mainStatus: node)
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let conv = ConversationViewController(preloadedTree: tree, state: state.copy(), mastodonController: mastodonController)
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conv.statusIDToScrollToOnLoad = childThreads.first!.status.id
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conv.showStatusesAutomatically = showStatusesAutomatically
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show(conv)
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@ -320,6 +329,34 @@ extension ConversationCollectionViewController: UICollectionViewDelegate {
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}
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}
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// ConversationNode doesn't know about its parent, so we reconstruct that info from the data source
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private func buildNewAncestors(above indexPath: IndexPath) -> [ConversationNode] {
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let snapshot = dataSource.snapshot()
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let currentAncestors = snapshot.itemIdentifiers(inSection: .ancestors).compactMap {
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if case .status(id: _, node: let node, _, _, _) = $0 {
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return node
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} else {
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return nil
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}
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}
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let currentMainStatus = snapshot.itemIdentifiers(inSection: .mainStatus).compactMap {
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if case .status(id: _, node: let node, _, _, _) = $0 {
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return node
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} else {
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return nil
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}
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}
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let parentsInCurrentSection = snapshot.itemIdentifiers(inSection: dataSource.sectionIdentifier(for: indexPath.section)!)[0..<indexPath.row].compactMap {
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if case .status(id: _, node: let node, _, _, _) = $0 {
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return node
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} else {
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return nil
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}
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}
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return currentAncestors + currentMainStatus + parentsInCurrentSection
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}
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func collectionView(_ collectionView: UICollectionView, contextMenuConfigurationForItemAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration? {
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return (collectionView.cellForItem(at: indexPath) as? TimelineStatusCollectionViewCell)?.contextMenuConfiguration()
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}
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@ -19,32 +19,56 @@ class ConversationNode {
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}
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}
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struct ConversationTree {
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let ancestors: [String]
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let descendants: [ConversationNode]
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static func build(from context: ConversationContext, mainStatus: StatusMO, descendants: [StatusMO]) -> ConversationTree {
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let ancestors = getDirectParents(inReplyTo: mainStatus.inReplyToID, from: context)
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let childThreads = getDescendantThreads(mainStatus: mainStatus, descendants: descendants)
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return ConversationTree(ancestors: ancestors, descendants: childThreads)
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let ancestors: [ConversationNode]
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let mainStatus: ConversationNode
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var descendants: [ConversationNode] {
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mainStatus.children
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}
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private static func getDirectParents(inReplyTo inReplyToID: String?, from context: ConversationContext) -> [String] {
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var statuses = context.ancestors
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var parents = [String]()
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init(ancestors: [ConversationNode], mainStatus: ConversationNode) {
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self.ancestors = ancestors
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self.mainStatus = mainStatus
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}
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static func build(for mainStatus: StatusMO, ancestors: [StatusMO], descendants: [StatusMO]) -> ConversationTree {
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let mainStatusNode = ConversationNode(status: mainStatus)
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let ancestors = buildAncestorNodes(mainStatusNode: mainStatusNode, ancestors: ancestors)
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buildDescendantNodes(mainStatusNode: mainStatusNode, descendants: descendants)
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return ConversationTree(ancestors: ancestors, mainStatus: mainStatusNode)
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}
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private static func buildAncestorNodes(mainStatusNode: ConversationNode, ancestors: [StatusMO]) -> [ConversationNode] {
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var statuses = ancestors
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var parents = [ConversationNode]()
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var parentID: String? = inReplyToID
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var parentID: String? = mainStatusNode.status.inReplyToID
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while let currentParentID = parentID,
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let parentIndex = statuses.firstIndex(where: { $0.id == currentParentID }) {
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let parentStatus = statuses.remove(at: parentIndex)
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parents.insert(parentStatus.id, at: 0)
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let node = ConversationNode(status: parentStatus)
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parents.insert(node, at: 0)
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parentID = parentStatus.inReplyToID
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}
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// once the parents list is built and in-order, then we walk through and set each node's children
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for (index, node) in parents.enumerated() {
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if index == parents.count - 1 {
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// the last parent is the direct parent of the main status
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node.children = [mainStatusNode]
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} else {
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// otherwise, it's the parent of the status that comes immediately after it in the parents list
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node.children = [parents[index + 1]]
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}
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}
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return parents
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}
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private static func getDescendantThreads(mainStatus: StatusMO, descendants: [StatusMO]) -> [ConversationNode] {
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// doesn't return anything, since we're modifying the main status node in-place
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private static func buildDescendantNodes(mainStatusNode: ConversationNode, descendants: [StatusMO]) {
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var descendants = descendants
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func removeAllInReplyTo(id: String) -> [StatusMO] {
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@ -53,12 +77,11 @@ struct ConversationTree {
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return statuses
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}
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let mainStatusNode = ConversationNode(status: mainStatus)
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var nodes: [String: ConversationNode] = [
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mainStatus.id: mainStatusNode
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mainStatusNode.status.id: mainStatusNode
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]
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var idsToCheck = [mainStatus.id]
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var idsToCheck = [mainStatusNode.status.id]
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while !idsToCheck.isEmpty {
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let inReplyToID = idsToCheck.removeFirst()
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@ -74,7 +97,5 @@ struct ConversationTree {
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nodeForID.children.append(replyNode)
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}
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}
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return mainStatusNode.children
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}
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}
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@ -77,6 +77,14 @@ class ConversationViewController: UIViewController {
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super.init(nibName: nil, bundle: nil)
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}
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init(preloadedTree: ConversationTree, state mainStatusState: CollapseState, mastodonController: MastodonController) {
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self.mode = .preloaded(preloadedTree)
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self.mainStatusState = mainStatusState
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self.mastodonController = mastodonController
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super.init(nibName: nil, bundle: nil)
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}
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required init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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@ -115,9 +123,15 @@ class ConversationViewController: UIViewController {
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override func viewWillAppear(_ animated: Bool) {
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super.viewWillAppear(animated)
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Task {
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if case .unloaded = state {
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await loadMainStatus()
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if case .unloaded = state {
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if case .preloaded(let tree) = mode {
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// when everything is preloaded, we're on the fast path and want to avoid any async work
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// just kicking off a MainActor task causes a delay before the content appears, even if the task doesn't suspend
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mainStatusLoaded(tree.mainStatus.status)
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} else {
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Task { @MainActor in
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await loadMainStatus()
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}
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}
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}
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}
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@ -142,9 +156,20 @@ class ConversationViewController: UIViewController {
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// MARK: Loading
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@MainActor
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private func loadMainStatus() async {
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guard let mainStatusID = await resolveStatusIfNecessary() else {
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return
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let mainStatusID: String
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switch mode {
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case .localID(let id):
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mainStatusID = id
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case .resolve(let url):
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if let id = await resolveStatus(url: url) {
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mainStatusID = id
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} else {
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return
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}
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case .preloaded(_):
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fatalError("unreachable")
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}
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@MainActor
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@ -166,7 +191,7 @@ class ConversationViewController: UIViewController {
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Task {
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await doLoadMainStatus()
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}
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await mainStatusLoaded(cached)
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mainStatusLoaded(cached)
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} else {
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// otherwise, show a loading indicator while loading the main status
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let indicator = UIActivityIndicatorView(style: .medium)
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@ -174,74 +199,94 @@ class ConversationViewController: UIViewController {
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state = .loading(indicator)
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if let status = await doLoadMainStatus() {
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await mainStatusLoaded(status)
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mainStatusLoaded(status)
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}
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}
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}
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@MainActor
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private func resolveStatusIfNecessary() async -> String? {
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switch mode {
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case .localID(let id):
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return id
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case .resolve(let url):
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let indicator = UIActivityIndicatorView(style: .medium)
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indicator.startAnimating()
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state = .loading(indicator)
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let url = WebURL(url)!.serialized(excludingFragment: true)
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let request = Client.search(query: url, types: [.statuses], resolve: true)
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do {
|
||||
let (results, _) = try await mastodonController.run(request)
|
||||
guard let status = results.statuses.first(where: { $0.url?.serialized() == url }) else {
|
||||
throw UnableToResolveError()
|
||||
}
|
||||
_ = mastodonController.persistentContainer.addOrUpdateOnViewContext(status: status)
|
||||
mode = .localID(status.id)
|
||||
return status.id
|
||||
} catch {
|
||||
state = .unableToResolve(error)
|
||||
return nil
|
||||
private func resolveStatus(url: URL) async -> String? {
|
||||
let indicator = UIActivityIndicatorView(style: .medium)
|
||||
indicator.startAnimating()
|
||||
state = .loading(indicator)
|
||||
|
||||
let url = WebURL(url)!.serialized(excludingFragment: true)
|
||||
let request = Client.search(query: url, types: [.statuses], resolve: true)
|
||||
do {
|
||||
let (results, _) = try await mastodonController.run(request)
|
||||
guard let status = results.statuses.first(where: { $0.url?.serialized() == url }) else {
|
||||
throw UnableToResolveError()
|
||||
}
|
||||
_ = mastodonController.persistentContainer.addOrUpdateOnViewContext(status: status)
|
||||
mode = .localID(status.id)
|
||||
return status.id
|
||||
} catch {
|
||||
state = .unableToResolve(error)
|
||||
return nil
|
||||
}
|
||||
}
|
||||
|
||||
@MainActor
|
||||
private func mainStatusLoaded(_ mainStatus: StatusMO) async {
|
||||
private func mainStatusLoaded(_ mainStatus: StatusMO) {
|
||||
let vc = ConversationCollectionViewController(for: mainStatus.id, state: mainStatusState, mastodonController: mastodonController)
|
||||
vc.statusIDToScrollToOnLoad = statusIDToScrollToOnLoad ?? mainStatus.id
|
||||
vc.showStatusesAutomatically = showStatusesAutomatically
|
||||
vc.addMainStatus(mainStatus)
|
||||
state = .displaying(vc)
|
||||
|
||||
await loadContext(for: mainStatus)
|
||||
if case .preloaded(let tree) = mode {
|
||||
vc.addTree(tree, mainStatus: mainStatus)
|
||||
} else {
|
||||
Task { @MainActor in
|
||||
await loadTree(for: mainStatus)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@MainActor
|
||||
private func loadContext(for mainStatus: StatusMO) async {
|
||||
guard case .displaying(_) = state else {
|
||||
private func loadTree(for mainStatus: StatusMO) async {
|
||||
guard case .displaying(_) = state,
|
||||
let context = await loadContext(for: mainStatus) else {
|
||||
return
|
||||
}
|
||||
|
||||
await mastodonController.persistentContainer.addAll(statuses: context.ancestors + context.descendants)
|
||||
|
||||
let ancestorIDs = context.ancestors.map(\.id)
|
||||
let ancestorsReq = StatusMO.fetchRequest()
|
||||
ancestorsReq.predicate = NSPredicate(format: "id in %@", ancestorIDs)
|
||||
let ancestors = try? mastodonController.persistentContainer.viewContext.fetch(ancestorsReq)
|
||||
|
||||
let descendantIDs = context.descendants.map(\.id)
|
||||
let descendantsReq = StatusMO.fetchRequest()
|
||||
descendantsReq.predicate = NSPredicate(format: "id IN %@", descendantIDs)
|
||||
let descendants = try? mastodonController.persistentContainer.viewContext.fetch(descendantsReq)
|
||||
|
||||
let tree = ConversationTree.build(for: mainStatus, ancestors: ancestors ?? [], descendants: descendants ?? [])
|
||||
|
||||
guard case .displaying(let vc) = state else {
|
||||
return
|
||||
}
|
||||
vc.addTree(tree, mainStatus: mainStatus)
|
||||
}
|
||||
|
||||
private func loadContext(for mainStatus: StatusMO) async -> ConversationContext? {
|
||||
let request = Status.getContext(mainStatus.id)
|
||||
do {
|
||||
let (context, _) = try await mastodonController.run(request)
|
||||
guard case .displaying(let vc) = state else {
|
||||
return
|
||||
}
|
||||
|
||||
await vc.addContext(context, for: mainStatus)
|
||||
return context
|
||||
} catch {
|
||||
guard case .displaying(_) = state else {
|
||||
return
|
||||
return nil
|
||||
}
|
||||
let error = error as! Client.Error
|
||||
|
||||
let config = ToastConfiguration(from: error, with: "Error Loading Context", in: self) { [weak self] toast in
|
||||
toast.dismissToast(animated: true)
|
||||
await self?.loadContext(for: mainStatus)
|
||||
await self?.loadTree(for: mainStatus)
|
||||
}
|
||||
self.showToast(configuration: config, animated: true)
|
||||
|
||||
return nil
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -341,6 +386,7 @@ extension ConversationViewController {
|
|||
enum Mode {
|
||||
case localID(String)
|
||||
case resolve(URL)
|
||||
case preloaded(ConversationTree)
|
||||
}
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue