Show jump to present toast if necessary when scene re-appears
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ce534c4a05
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9ff1452c68
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@ -125,6 +125,8 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
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cell.update()
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}
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}
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NotificationCenter.default.addObserver(self, selector: #selector(sceneWillEnterForeground), name: UIScene.willEnterForegroundNotification, object: nil)
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}
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// separate method because InstanceTimelineViewController needs to be able to customize it
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@ -242,6 +244,20 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
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// }
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// }
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@objc private func sceneWillEnterForeground(_ notification: Foundation.Notification) {
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guard let scene = notification.object as? UIScene,
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// view.window is nil when the VC is not on screen
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view.window?.windowScene == scene else {
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return
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}
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Task {
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if case .idle = controller.state,
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let presentItems = try? await loadInitial() {
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insertPresentItemsIfNecessary(presentItems)
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}
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}
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}
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@objc func refresh() {
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Task {
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if case .notLoadedInitial = controller.state {
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@ -249,47 +265,8 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
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} else {
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// I'm not sure whether this should move into TimelineLikeController/TimelineLikeCollectionViewController
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let (_, presentItems) = await (controller.loadNewer(), try? loadInitial())
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if let presentItems,
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case .status(id: let id, state: _) = dataSource.snapshot().itemIdentifiers(inSection: .statuses).first {
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// if there's no overlap between presentItems and the existing items in the data source, prompt the user to scroll to present
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if !presentItems.contains(id) {
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var snapshot = self.dataSource.snapshot()
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let currentItems = snapshot.itemIdentifiers(inSection: .statuses)
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guard let item = currentItems.first,
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case .status(id: id, state: _) = item else {
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return
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}
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// remove any existing gap if there is one
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if let index = currentItems.lastIndex(of: .gap) {
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snapshot.deleteItems(Array(currentItems[index...]))
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}
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snapshot.insertItems([.gap], beforeItem: item)
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snapshot.insertItems(presentItems.map { .status(id: $0, state: .unknown) }, beforeItem: .gap)
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// use a snapshot of the collection view to hide the flicker as the content offset changes and then changes back
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let snapshotView = collectionView.snapshotView(afterScreenUpdates: false)!
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snapshotView.layer.zPosition = 1000
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snapshotView.frame = view.bounds
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view.addSubview(snapshotView)
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let bottomOffset = collectionView.contentSize.height - collectionView.contentOffset.y
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self.dataSource.apply(snapshot, animatingDifferences: false) {
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self.collectionView.contentOffset = CGPoint(x: 0, y: self.collectionView.contentSize.height - bottomOffset)
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snapshotView.removeFromSuperview()
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}
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var config = ToastConfiguration(title: "Jump to present")
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config.edge = .top
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config.systemImageName = "arrow.up"
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config.dismissAutomaticallyAfter = 4
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config.action = { [unowned self] toast in
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toast.dismissToast(animated: true)
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self.collectionView.scrollToTop()
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}
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self.showToast(configuration: config, animated: true)
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}
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if let presentItems {
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insertPresentItemsIfNecessary(presentItems)
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}
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}
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#if !targetEnvironment(macCatalyst)
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@ -298,6 +275,68 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
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}
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}
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private func insertPresentItemsIfNecessary(_ presentItems: [String]) {
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var snapshot = dataSource.snapshot()
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let currentItems = snapshot.itemIdentifiers(inSection: .statuses)
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if case .status(id: let firstID, state: _) = currentItems.first,
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// if there's no overlap between presentItems and the existing items in the data source, insert the present items and prompt the user
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!presentItems.contains(firstID) {
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let applySnapshotBeforeScrolling: Bool
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// remove any existing gap, if there is one
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if let index = currentItems.lastIndex(of: .gap) {
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snapshot.deleteItems(Array(currentItems[index...]))
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let statusesSection = snapshot.indexOfSection(.statuses)!
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if collectionView.indexPathsForVisibleItems.contains(IndexPath(row: index, section: statusesSection)) {
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// the gap cell is on screen
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applySnapshotBeforeScrolling = false
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} else if let topMostVisibleCell = collectionView.indexPathsForVisibleItems.first(where: { $0.section == statusesSection }),
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index < topMostVisibleCell.row {
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// the gap cell is above the top, so applying the snapshot would remove the currently-viewed statuses
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applySnapshotBeforeScrolling = false
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} else {
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// the gap cell is below the bottom of the screen
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applySnapshotBeforeScrolling = true
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}
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} else {
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// there is no existing gap
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applySnapshotBeforeScrolling = true
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}
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snapshot.insertItems([.gap], beforeItem: currentItems.first!)
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snapshot.insertItems(presentItems.map { .status(id: $0, state: .unknown) }, beforeItem: .gap)
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if applySnapshotBeforeScrolling {
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// use a snapshot of the collection view to hide the flicker as the content offset changes and then changes back
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let snapshotView = collectionView.snapshotView(afterScreenUpdates: false)!
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snapshotView.layer.zPosition = 1000
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snapshotView.frame = view.bounds
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view.addSubview(snapshotView)
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let bottomOffset = collectionView.contentSize.height - collectionView.contentOffset.y
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self.dataSource.apply(snapshot, animatingDifferences: false) {
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self.collectionView.contentOffset = CGPoint(x: 0, y: self.collectionView.contentSize.height - bottomOffset)
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snapshotView.removeFromSuperview()
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}
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}
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var config = ToastConfiguration(title: "Jump to present")
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config.edge = .top
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config.systemImageName = "arrow.up"
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config.dismissAutomaticallyAfter = 4
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config.action = { [unowned self] toast in
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toast.dismissToast(animated: true)
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if !applySnapshotBeforeScrolling {
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self.dataSource.apply(snapshot, animatingDifferences: false)
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}
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self.collectionView.scrollToTop()
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}
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self.showToast(configuration: config, animated: true)
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}
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}
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}
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extension TimelineViewController {
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