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Prune offscreen rows on new timeline

This commit is contained in:
Shadowfacts 2022-10-09 20:11:00 -04:00
parent e78bec8409
commit a703b7cc0a
1 changed files with 20 additions and 1 deletions
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21
Tusker/Screens/Timeline/TimelineViewController.swift
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@ -160,7 +160,7 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
override func viewDidDisappear(_ animated: Bool) {
super.viewDidDisappear(animated)
// TODO: prune offscreen rows
pruneOffscreenRows()
}
private func removeTimelineDescriptionCell() {
@ -170,6 +170,25 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
isShowingTimelineDescription = false
}
private func pruneOffscreenRows() {
guard let lastVisibleIndexPath = collectionView.indexPathsForVisibleItems.last else {
return
}
var snapshot = dataSource.snapshot()
let items = snapshot.itemIdentifiers(inSection: .statuses)
let pageSize = 20
let numberOfPagesToPrune = (items.count - lastVisibleIndexPath.row - 1) / pageSize
if numberOfPagesToPrune > 0 {
let itemsToRemove = Array(items.suffix(numberOfPagesToPrune * pageSize))
snapshot.deleteItems(itemsToRemove)
}
dataSource.apply(snapshot, animatingDifferences: false)
if case .status(id: let id, state: _) = snapshot.itemIdentifiers(inSection: .statuses).last {
older = .before(id: id, count: nil)
}
}
@objc func refresh() {
Task {
await controller.loadNewer()