Add extended suggested profiles screen

Closes #355

Packages/Pachyderm/Sources/Pachyderm/Client.swift

@@ -417,32 +417,46 @@ public class Client {
     }
     
     // MARK: - Instance
-    public static func getTrendingHashtags(limit: Int? = nil) -> Request<[Hashtag]> {
+    public static func getTrendingHashtagsDeprecated(limit: Int? = nil, offset: Int? = nil) -> Request<[Hashtag]> {
-        let parameters: [Parameter]
+        var parameters: [Parameter] = []
-        if let limit = limit {
+        if let limit {
-            parameters = ["limit" => limit]
+            parameters.append("limit" => limit)
-        } else {
+        }
-            parameters = []
+        if let offset {
+            parameters.append("offset" => offset)
         }
         return Request<[Hashtag]>(method: .get, path: "/api/v1/trends", queryParameters: parameters)
     }
     
-    public static func getTrendingStatuses(limit: Int? = nil) -> Request<[Status]> {
+    public static func getTrendingHashtags(limit: Int? = nil, offset: Int? = nil) -> Request<[Hashtag]> {
-        let parameters: [Parameter]
+        var parameters: [Parameter] = []
-        if let limit = limit {
+        if let limit {
-            parameters = ["limit" => limit]
+            parameters.append("limit" => limit)
-        } else {
+        }
-            parameters = []
+        if let offset {
+            parameters.append("offset" => offset)
+        }
+        return Request<[Hashtag]>(method: .get, path: "/api/v1/trends/tags", queryParameters: parameters)
+    }
+    
+    public static func getTrendingStatuses(limit: Int? = nil, offset: Int? = nil) -> Request<[Status]> {
+        var parameters: [Parameter] = []
+        if let limit {
+            parameters.append("limit" => limit)
+        }
+        if let offset {
+            parameters.append("offset" => offset)
         }
         return Request(method: .get, path: "/api/v1/trends/statuses", queryParameters: parameters)
     }
     
-    public static func getTrendingLinks(limit: Int? = nil) -> Request<[Card]> {
+    public static func getTrendingLinks(limit: Int? = nil, offset: Int? = nil) -> Request<[Card]> {
-        let parameters: [Parameter]
+        var parameters: [Parameter] = []
-        if let limit = limit {
+        if let limit {
-            parameters = ["limit" => limit]
+            parameters.append("limit" => limit)
-        } else {
+        }
-            parameters = []
+        if let offset {
+            parameters.append("offset" => offset)
         }
         return Request(method: .get, path: "/api/v1/trends/links", queryParameters: parameters)
     }

Tusker.xcodeproj/project.pbxproj

@@ -200,6 +200,7 @@
 		D681E4D7246E32290053414F /* StatusActivityItemSource.swift in Sources */ = {isa = PBXBuildFile; fileRef = D681E4D6246E32290053414F /* StatusActivityItemSource.swift */; };
 		D681E4D9246E346E0053414F /* AccountActivityItemSource.swift in Sources */ = {isa = PBXBuildFile; fileRef = D681E4D8246E346E0053414F /* AccountActivityItemSource.swift */; };
 		D68232F72464F4FD00325FB8 /* ComposeDrawingViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D68232F62464F4FD00325FB8 /* ComposeDrawingViewController.swift */; };
+		D68329EF299540050026EB24 /* MoreTrendsFooterCollectionViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = D68329EE299540050026EB24 /* MoreTrendsFooterCollectionViewCell.swift */; };
 		D686BBE324FBF8110068E6AA /* WrappedProgressView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D686BBE224FBF8110068E6AA /* WrappedProgressView.swift */; };
 		D6895DC228D65274006341DA /* CustomAlertController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6895DC128D65274006341DA /* CustomAlertController.swift */; };
 		D6895DC428D65342006341DA /* ConfirmReblogStatusPreviewView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6895DC328D65342006341DA /* ConfirmReblogStatusPreviewView.swift */; };
@@ -334,6 +335,7 @@
 		D6DD353F22F502EC00A9563A /* Preferences+Notification.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6DD353E22F502EC00A9563A /* Preferences+Notification.swift */; };
 		D6DD8FFD298495A8002AD3FD /* LogoutService.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6DD8FFC298495A8002AD3FD /* LogoutService.swift */; };
 		D6DD8FFF2984D327002AD3FD /* BookmarksViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6DD8FFE2984D327002AD3FD /* BookmarksViewController.swift */; };
+		D6DD996B2998611A0015C962 /* SuggestedProfilesViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6DD996A2998611A0015C962 /* SuggestedProfilesViewController.swift */; };
 		D6DF95C12533F5DE0027A9B6 /* RelationshipMO.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6DF95C02533F5DE0027A9B6 /* RelationshipMO.swift */; };
 		D6DFC69E242C490400ACC392 /* TrackpadScrollGestureRecognizer.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6DFC69D242C490400ACC392 /* TrackpadScrollGestureRecognizer.swift */; };
 		D6DFC6A0242C4CCC00ACC392 /* Weak.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6DFC69F242C4CCC00ACC392 /* Weak.swift */; };
@@ -612,6 +614,7 @@
 		D681E4D6246E32290053414F /* StatusActivityItemSource.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = StatusActivityItemSource.swift; sourceTree = "<group>"; };
 		D681E4D8246E346E0053414F /* AccountActivityItemSource.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AccountActivityItemSource.swift; sourceTree = "<group>"; };
 		D68232F62464F4FD00325FB8 /* ComposeDrawingViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ComposeDrawingViewController.swift; sourceTree = "<group>"; };
+		D68329EE299540050026EB24 /* MoreTrendsFooterCollectionViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MoreTrendsFooterCollectionViewCell.swift; sourceTree = "<group>"; };
 		D686BBE224FBF8110068E6AA /* WrappedProgressView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = WrappedProgressView.swift; sourceTree = "<group>"; };
 		D6895DC128D65274006341DA /* CustomAlertController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CustomAlertController.swift; sourceTree = "<group>"; };
 		D6895DC328D65342006341DA /* ConfirmReblogStatusPreviewView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ConfirmReblogStatusPreviewView.swift; sourceTree = "<group>"; };
@@ -754,6 +757,7 @@
 		D6DD353E22F502EC00A9563A /* Preferences+Notification.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Preferences+Notification.swift"; sourceTree = "<group>"; };
 		D6DD8FFC298495A8002AD3FD /* LogoutService.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LogoutService.swift; sourceTree = "<group>"; };
 		D6DD8FFE2984D327002AD3FD /* BookmarksViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BookmarksViewController.swift; sourceTree = "<group>"; };
+		D6DD996A2998611A0015C962 /* SuggestedProfilesViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SuggestedProfilesViewController.swift; sourceTree = "<group>"; };
 		D6DF95C02533F5DE0027A9B6 /* RelationshipMO.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RelationshipMO.swift; sourceTree = "<group>"; };
 		D6DFC69D242C490400ACC392 /* TrackpadScrollGestureRecognizer.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TrackpadScrollGestureRecognizer.swift; sourceTree = "<group>"; };
 		D6DFC69F242C4CCC00ACC392 /* Weak.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Weak.swift; sourceTree = "<group>"; };
@@ -945,6 +949,8 @@
 				D693A72D25CF91C6003A14E2 /* FeaturedProfileCollectionViewCell.swift */,
 				D693A72E25CF91C6003A14E2 /* FeaturedProfileCollectionViewCell.xib */,
 				D6C3F4FA299035650009FCFF /* TrendsViewController.swift */,
+				D68329EE299540050026EB24 /* MoreTrendsFooterCollectionViewCell.swift */,
+				D6DD996A2998611A0015C962 /* SuggestedProfilesViewController.swift */,
 			);
 			path = Explore;
 			sourceTree = "<group>";
@@ -1965,6 +1971,7 @@
 				D6093FB725BE0CF3004811E6 /* TrendHistoryView.swift in Sources */,
 				D6EBF01723C55E0D00AE061B /* UISceneSession+MastodonController.swift in Sources */,
 				D61F759229365C6C00C0B37F /* CollectionViewController.swift in Sources */,
+				D6DD996B2998611A0015C962 /* SuggestedProfilesViewController.swift in Sources */,
 				D6DD8FFD298495A8002AD3FD /* LogoutService.swift in Sources */,
 				04DACE8C212CB14B009840C4 /* MainTabBarViewController.swift in Sources */,
 				D68E525D24A3E8F00054355A /* InlineTrendsViewController.swift in Sources */,
@@ -2072,6 +2079,7 @@
 				D6A00B1D26379FC900316AD4 /* PollOptionsView.swift in Sources */,
 				D6DF95C12533F5DE0027A9B6 /* RelationshipMO.swift in Sources */,
 				D6ADB6EE28EA74E8009924AB /* UIView+Configure.swift in Sources */,
+				D68329EF299540050026EB24 /* MoreTrendsFooterCollectionViewCell.swift in Sources */,
 				D623A5412635FB3C0095BD04 /* PollOptionView.swift in Sources */,
 				D61F75B1293BD85300C0B37F /* CreateFilterService.swift in Sources */,
 				D65C6BF525478A9C00A6E89C /* BackgroundableViewController.swift in Sources */,

Tusker/Screens/Explore/MoreTrendsFooterCollectionViewCell.swift

@@ -0,0 +1,84 @@
+//
+//  MoreTrendsFooterCollectionViewCell.swift
+//  Tusker
+//
+//  Created by Shadowfacts on 2/9/23.
+//  Copyright © 2023 Shadowfacts. All rights reserved.
+//
+
+import UIKit
+
+class MoreTrendsFooterCollectionViewCell: UICollectionViewCell {
+    
+    weak var delegate: TuskerNavigationDelegate?
+    
+    private var button = UIButton()
+    
+    private var kind: Kind!
+    
+    override init(frame: CGRect) {
+        super.init(frame: frame)
+        
+        button.addTarget(self, action: #selector(buttonPressed), for: .touchUpInside)
+        button.translatesAutoresizingMaskIntoConstraints = false
+        contentView.addSubview(button)
+        NSLayoutConstraint.activate([
+            button.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
+            button.topAnchor.constraint(equalTo: contentView.topAnchor),
+            button.bottomAnchor.constraint(equalTo: contentView.bottomAnchor),
+        ])
+    }
+    
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    func updateUI(_ kind: Kind) {
+        guard self.kind != kind else {
+            return
+        }
+        self.kind = kind
+        
+        var config = UIButton.Configuration.plain()
+        var title: AttributedString
+        switch kind {
+        case .hashtags:
+            title = "More Trending Hashtags"
+        case .links:
+            title = "More Trending Links"
+        case .profileSuggestions:
+            title = "More Suggested Accounts"
+        }
+        title.font = .preferredFont(forTextStyle: .body).withTraits(.traitBold)!
+        config.attributedTitle = title
+        config.image = UIImage(systemName: "chevron.right")
+        config.imagePlacement = .trailing
+        config.buttonSize = .mini
+        button.configuration = config
+    }
+    
+    @objc private func buttonPressed() {
+        guard let delegate else {
+            return
+        }
+        switch kind {
+        case nil:
+            return
+        case .hashtags:
+            delegate.show(TrendingHashtagsViewController(mastodonController: delegate.apiController))
+        case .links:
+            delegate.show(TrendingLinksViewController(mastodonController: delegate.apiController))
+        case .profileSuggestions:
+            delegate.show(SuggestedProfilesViewController(mastodonController: delegate.apiController))
+        }
+    }
+    
+}
+
+extension MoreTrendsFooterCollectionViewCell {
+    enum Kind {
+        case hashtags
+        case links
+        case profileSuggestions
+    }
+}

Tusker/Screens/Explore/SuggestedProfilesViewController.swift

@@ -0,0 +1,212 @@
+//
+//  SuggestedProfilesViewController.swift
+//  Tusker
+//
+//  Created by Shadowfacts on 2/11/23.
+//  Copyright © 2023 Shadowfacts. All rights reserved.
+//
+
+import UIKit
+import Pachyderm
+
+class SuggestedProfilesViewController: UIViewController, CollectionViewController {
+    
+    weak var mastodonController: MastodonController!
+    
+    var collectionView: UICollectionView!
+    private var dataSource: UICollectionViewDiffableDataSource<Section, Item>!
+    
+    private var state = State.unloaded
+    
+    init(mastodonController: MastodonController) {
+        self.mastodonController = mastodonController
+        
+        super.init(nibName: nil, bundle: nil)
+    }
+    
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        title = "Suggested Accounts"
+        
+        let layout = UICollectionViewCompositionalLayout { [unowned self] sectionIndex, environment in
+            switch dataSource.sectionIdentifier(for: sectionIndex) {
+            case nil:
+                fatalError()
+                
+            case .loadingIndicator:
+                var config = UICollectionLayoutListConfiguration(appearance: .grouped)
+                config.backgroundColor = .appGroupedBackground
+                config.showsSeparators = false
+                return .list(using: config, layoutEnvironment: environment)
+                
+            case .accounts:
+                let size = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1), heightDimension: .estimated(280))
+                let item = NSCollectionLayoutItem(layoutSize: size)
+                let item2 = NSCollectionLayoutItem(layoutSize: size)
+                let group = NSCollectionLayoutGroup.vertical(layoutSize: size, subitems: [item, item2])
+                group.contentInsets = NSDirectionalEdgeInsets(top: 0, leading: 16, bottom: 0, trailing: 16)
+                group.interItemSpacing = .fixed(16)
+                let section = NSCollectionLayoutSection(group: group)
+                section.interGroupSpacing = 16
+                section.contentInsets = NSDirectionalEdgeInsets(top: 16, leading: 0, bottom: 16, trailing: 0)
+                return section
+            }
+        }
+        collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
+        collectionView.translatesAutoresizingMaskIntoConstraints = false
+        collectionView.delegate = self
+        collectionView.dragDelegate = self
+        collectionView.backgroundColor = .appGroupedBackground
+        collectionView.allowsFocus = true
+        view.addSubview(collectionView)
+        NSLayoutConstraint.activate([
+            collectionView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+            collectionView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+            collectionView.topAnchor.constraint(equalTo: view.topAnchor),
+            collectionView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+        ])
+        
+        dataSource = createDataSource()
+    }
+    
+    private func createDataSource() -> UICollectionViewDiffableDataSource<Section, Item> {
+        let loadingCell = UICollectionView.CellRegistration<LoadingCollectionViewCell, Void> { cell, indexPath, itemIdentifier in
+            cell.indicator.startAnimating()
+        }
+        let accountCell = UICollectionView.CellRegistration<SuggestedProfileCardCollectionViewCell, (String, Suggestion.Source)>(cellNib: UINib(nibName: "SuggestedProfileCardCollectionViewCell", bundle: .main)) { cell, indexPath, item in
+            cell.delegate = self
+            cell.updateUI(accountID: item.0, source: item.1)
+        }
+        return UICollectionViewDiffableDataSource(collectionView: collectionView) { collectionView, indexPath, itemIdentifier in
+            switch itemIdentifier {
+            case .loadingIndicator:
+                return collectionView.dequeueConfiguredReusableCell(using: loadingCell, for: indexPath, item: ())
+            case .account(let id, let source):
+                return collectionView.dequeueConfiguredReusableCell(using: accountCell, for: indexPath, item: (id, source))
+            }
+        }
+    }
+    
+    override func viewWillAppear(_ animated: Bool) {
+        super.viewWillAppear(animated)
+        
+        Task {
+            await loadInitial()
+        }
+    }
+    
+    @MainActor
+    private func loadInitial() async {
+        guard case .unloaded = state else {
+            return
+        }
+        state = .loading
+        
+        var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
+        snapshot.appendSections([.loadingIndicator])
+        snapshot.appendItems([.loadingIndicator])
+        await dataSource.apply(snapshot)
+        
+        do {
+            let request = Client.getSuggestions(limit: 80)
+            let (suggestions, _) = try await mastodonController.run(request)
+            
+            await mastodonController.persistentContainer.addAll(accounts: suggestions.map(\.account))
+            
+            var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
+            snapshot.appendSections([.accounts])
+            snapshot.appendItems(suggestions.map { .account($0.account.id, $0.source) })
+            await dataSource.apply(snapshot)
+            
+            state = .loaded
+        } catch {
+            state = .unloaded
+            let config = ToastConfiguration(from: error, with: "Error Loading Suggested Accounts", in: self) { [weak self] toast in
+                toast.dismissToast(animated: true)
+                await self?.loadInitial()
+            }
+            showToast(configuration: config, animated: true)
+        }
+    }
+    
+}
+
+extension SuggestedProfilesViewController {
+    enum State {
+        case unloaded
+        case loading
+        case loaded
+    }
+}
+
+extension SuggestedProfilesViewController {
+    enum Section {
+        case loadingIndicator
+        case accounts
+    }
+    enum Item: Hashable {
+        case loadingIndicator
+        case account(String, Suggestion.Source)
+    }
+}
+
+extension SuggestedProfilesViewController: UICollectionViewDelegate {
+    func collectionView(_ collectionView: UICollectionView, shouldSelectItemAt indexPath: IndexPath) -> Bool {
+        if case .account(_, _) = dataSource.itemIdentifier(for: indexPath) {
+            return true
+        } else {
+            return false
+        }
+    }
+    
+    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
+        guard case .account(let id, _) = dataSource.itemIdentifier(for: indexPath) else {
+            return
+        }
+        selected(account: id)
+    }
+    
+    func collectionView(_ collectionView: UICollectionView, contextMenuConfigurationForItemAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration? {
+        guard case .account(let id, _) = dataSource.itemIdentifier(for: indexPath),
+              let cell = collectionView.cellForItem(at: indexPath) else {
+            return nil
+        }
+        return UIContextMenuConfiguration {
+            ProfileViewController(accountID: id, mastodonController: self.mastodonController)
+        } actionProvider: { _ in
+            UIMenu(children: self.actionsForProfile(accountID: id, source: .view(cell)))
+        }
+    }
+    
+    func collectionView(_ collectionView: UICollectionView, willPerformPreviewActionForMenuWith configuration: UIContextMenuConfiguration, animator: UIContextMenuInteractionCommitAnimating) {
+        MenuPreviewHelper.willPerformPreviewAction(animator: animator, presenter: self)
+    }
+}
+
+extension SuggestedProfilesViewController: UICollectionViewDragDelegate {
+    func collectionView(_ collectionView: UICollectionView, itemsForBeginning session: UIDragSession, at indexPath: IndexPath) -> [UIDragItem] {
+        guard case .account(let id, _) = dataSource.itemIdentifier(for: indexPath),
+              let account = mastodonController.persistentContainer.account(for: id) else {
+            return []
+        }
+        let provider = NSItemProvider(object: account.url as NSURL)
+        let activity = UserActivityManager.showProfileActivity(id: id, accountID: mastodonController.accountInfo!.id)
+        provider.registerObject(activity, visibility: .all)
+        return [UIDragItem(itemProvider: provider)]
+    }
+}
+
+extension SuggestedProfilesViewController: TuskerNavigationDelegate {
+    var apiController: MastodonController! { mastodonController }
+}
+
+extension SuggestedProfilesViewController: MenuActionProvider {
+}
+
+extension SuggestedProfilesViewController: ToastableViewController {
+}

Tusker/Screens/Explore/TrendingHashtagsViewController.swift

@@ -9,6 +9,7 @@
 import UIKit
 import Pachyderm
 import WebURLFoundationExtras
+import Combine
 
 class TrendingHashtagsViewController: UIViewController {
 
@@ -17,6 +18,9 @@ class TrendingHashtagsViewController: UIViewController {
     private var collectionView: UICollectionView!
     private var dataSource: UICollectionViewDiffableDataSource<Section, Item>!
     
+    private var state = State.unloaded
+    private var confirmLoadMore = PassthroughSubject<Void, Never>()
+    
     init(mastodonController: MastodonController) {
         self.mastodonController = mastodonController
         
@@ -32,9 +36,21 @@ class TrendingHashtagsViewController: UIViewController {
 
         title = NSLocalizedString("Trending Hashtags", comment: "trending hashtags screen title")
         
-        view.backgroundColor = .systemGroupedBackground
+        view.backgroundColor = .appGroupedBackground
         
-        let config = UICollectionLayoutListConfiguration(appearance: .grouped)
+        var config = UICollectionLayoutListConfiguration(appearance: .grouped)
+        config.backgroundColor = .appGroupedBackground
+        config.itemSeparatorHandler = { [unowned self] indexPath, sectionConfig in
+            guard let item = dataSource.itemIdentifier(for: indexPath) else {
+                return sectionConfig
+            }
+            var config = sectionConfig
+            if item.hideSeparators {
+                config.topSeparatorVisibility = .hidden
+                config.bottomSeparatorVisibility = .hidden
+            }
+            return config
+        }
         let layout = UICollectionViewCompositionalLayout.list(using: config)
         collectionView = UICollectionView(frame: view.bounds, collectionViewLayout: layout)
         collectionView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
@@ -43,14 +59,24 @@ class TrendingHashtagsViewController: UIViewController {
         collectionView.allowsFocus = true
         view.addSubview(collectionView)
         
-        let registration = UICollectionView.CellRegistration<TrendingHashtagCollectionViewCell, Hashtag> { cell, indexPath, hashtag in
+        let loadingCell = UICollectionView.CellRegistration<LoadingCollectionViewCell, Void> { cell, indexPath, itemIdentifier in
+            cell.indicator.startAnimating()
+        }
+        let hashtagCell = UICollectionView.CellRegistration<TrendingHashtagCollectionViewCell, Hashtag> { cell, indexPath, hashtag in
             cell.updateUI(hashtag: hashtag)
         }
-        
+        let confirmLoadMoreCell = UICollectionView.CellRegistration<ConfirmLoadMoreCollectionViewCell, Bool> { [unowned self] cell, indexPath, isLoading in
+            cell.confirmLoadMore = self.confirmLoadMore
+            cell.isLoading = isLoading
+        }
         dataSource = UICollectionViewDiffableDataSource<Section, Item>(collectionView: collectionView) { (collectionView, indexPath, item) in
             switch item {
-            case let .tag(hashtag):
+            case .loadingIndicator:
-                return collectionView.dequeueConfiguredReusableCell(using: registration, for: indexPath, item: hashtag)
+                return collectionView.dequeueConfiguredReusableCell(using: loadingCell, for: indexPath, item: ())
+            case .tag(let hashtag):
+                return collectionView.dequeueConfiguredReusableCell(using: hashtagCell, for: indexPath, item: hashtag)
+            case .confirmLoadMore(let loading):
+                return collectionView.dequeueConfiguredReusableCell(using: confirmLoadMoreCell, for: indexPath, item: loading)
             }
         }
     }
@@ -58,18 +84,104 @@ class TrendingHashtagsViewController: UIViewController {
     override func viewWillAppear(_ animated: Bool) {
         super.viewWillAppear(animated)
         
-        let request = Client.getTrendingHashtags(limit: 10)
         Task {
-            guard let (hashtags, _) = try? await mastodonController.run(request) else {
+            await loadInitial()
-                return
-            }
-            var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
-            snapshot.appendSections([.trendingTags])
-            snapshot.appendItems(hashtags.map { .tag($0) })
-            await dataSource.apply(snapshot)
         }
     }
     
+    private func request(offset: Int?) -> Request<[Hashtag]> {
+        if mastodonController.instanceFeatures.hasMastodonVersion(3, 5, 0) {
+            return Client.getTrendingHashtags(offset: offset)
+        } else {
+            return Client.getTrendingHashtagsDeprecated(offset: offset)
+        }
+    }
+    
+    @MainActor
+    private func loadInitial() async {
+        guard case .unloaded = state else {
+            return
+        }
+        state = .loadingInitial
+        
+        var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
+        snapshot.appendSections([.trendingTags])
+        snapshot.appendItems([.loadingIndicator])
+        await dataSource.apply(snapshot)
+        
+        do {
+            let request = self.request(offset: nil)
+            let (hashtags, _) = try await mastodonController.run(request)
+            snapshot.deleteItems([.loadingIndicator])
+            snapshot.appendItems(hashtags.map { .tag($0) })
+            state = .loaded
+            await dataSource.apply(snapshot)
+        } catch {
+            snapshot.deleteItems([.loadingIndicator])
+            await dataSource.apply(snapshot)
+            state = .unloaded
+            
+            let config = ToastConfiguration(from: error, with: "Error Loading Trending Tags", in: self) { [weak self] toast in
+                toast.dismissToast(animated: true)
+                await self?.loadInitial()
+            }
+            self.showToast(configuration: config, animated: true)
+        }
+    }
+    
+    @MainActor
+    private func loadOlder() async {
+        guard case .loaded = state else {
+            return
+        }
+        state = .loadingOlder
+        
+        let origSnapshot = dataSource.snapshot()
+        var snapshot = origSnapshot
+        if Preferences.shared.disableInfiniteScrolling {
+            snapshot.appendItems([.confirmLoadMore(false)])
+            await dataSource.apply(snapshot)
+            
+            for await _ in confirmLoadMore.values {
+                break
+            }
+            
+            snapshot.deleteItems([.confirmLoadMore(false)])
+            snapshot.appendItems([.confirmLoadMore(true)])
+            await dataSource.apply(snapshot, animatingDifferences: false)
+        } else {
+            snapshot.appendItems([.loadingIndicator])
+            await dataSource.apply(snapshot)
+        }
+        
+        do {
+            let request = self.request(offset: snapshot.itemIdentifiers.count - 1)
+            let (hashtags, _) = try await mastodonController.run(request)
+            var snapshot = origSnapshot
+            snapshot.appendItems(hashtags.map { .tag($0) })
+            await dataSource.apply(snapshot)
+        } catch {
+            await dataSource.apply(origSnapshot)
+            
+            let config = ToastConfiguration(from: error, with: "Error Loading More Tags", in: self) { [weak self] toast in
+                toast.dismissToast(animated: true)
+                await self?.loadOlder()
+            }
+            self.showToast(configuration: config, animated: true)
+        }
+        
+        state = .loaded
+    }
+    
+}
+
+extension TrendingHashtagsViewController {
+    enum State {
+        case unloaded
+        case loadingInitial
+        case loaded
+        case loadingOlder
+    }
 }
 
 extension TrendingHashtagsViewController {
@@ -77,11 +189,45 @@ extension TrendingHashtagsViewController {
         case trendingTags
     }
     enum Item: Hashable {
+        case loadingIndicator
         case tag(Hashtag)
+        case confirmLoadMore(Bool)
+        
+        var hideSeparators: Bool {
+            switch self {
+            case .loadingIndicator:
+                return true
+            case .tag(_):
+                return false
+            case .confirmLoadMore(_):
+                return false
+            }
+        }
+        
+        var shouldSelect: Bool {
+            if case .tag(_) = self {
+                return true
+            } else {
+                return false
+            }
+        }
     }
 }
 
 extension TrendingHashtagsViewController: UICollectionViewDelegate {
+    func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
+        if indexPath.section == collectionView.numberOfSections - 1,
+           indexPath.row == collectionView.numberOfItems(inSection: indexPath.section) - 1 {
+            Task {
+                await self.loadOlder()
+            }
+        }
+    }
+    
+    func collectionView(_ collectionView: UICollectionView, shouldSelectItemAt indexPath: IndexPath) -> Bool {
+        return dataSource.itemIdentifier(for: indexPath)?.shouldSelect ?? false
+    }
+    
     func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
         guard let item = dataSource.itemIdentifier(for: indexPath),
               case let .tag(hashtag) = item else {

Tusker/Screens/Explore/TrendingLinkCardCollectionViewCell.swift

@@ -21,6 +21,29 @@ class TrendingLinkCardCollectionViewCell: UICollectionViewCell {
     @IBOutlet weak var providerLabel: UILabel!
     @IBOutlet weak var activityLabel: UILabel!
     @IBOutlet weak var historyView: TrendHistoryView!
+    private var thumbnailAspectRatioConstraint: NSLayoutConstraint?
+    
+    var verticalSize: VerticalSize! {
+        didSet {
+            guard oldValue != verticalSize else {
+                return
+            }
+            switch verticalSize {
+            case nil:
+                fatalError()
+            case .regular:
+                thumbnailAspectRatioConstraint?.isActive = false
+                thumbnailAspectRatioConstraint = thumbnailView.widthAnchor.constraint(equalTo: thumbnailView.heightAnchor, multiplier: 4/3)
+                thumbnailAspectRatioConstraint!.isActive = true
+                descriptionLabel.numberOfLines = 3
+            case .compact:
+                thumbnailAspectRatioConstraint?.isActive = false
+                thumbnailAspectRatioConstraint = thumbnailView.widthAnchor.constraint(equalTo: thumbnailView.heightAnchor, multiplier: 2/1)
+                thumbnailAspectRatioConstraint!.isActive = true
+                descriptionLabel.numberOfLines = 5
+            }
+        }
+    }
     
     private var hoverGestureAnimator: UIViewPropertyAnimator?
     
@@ -37,6 +60,8 @@ class TrendingLinkCardCollectionViewCell: UICollectionViewCell {
         contentView.backgroundColor = .appGroupedCellBackground
         updateLayerColors()
         
+        verticalSize = .regular
+        
         addGestureRecognizer(UIHoverGestureRecognizer(target: self, action: #selector(hoverRecognized)))
     }
     
@@ -137,3 +162,9 @@ class TrendingLinkCardCollectionViewCell: UICollectionViewCell {
     }
     
 }
+
+extension TrendingLinkCardCollectionViewCell {
+    enum VerticalSize {
+        case regular, compact
+    }
+}

Tusker/Screens/Explore/TrendingLinkCardCollectionViewCell.xib

@@ -21,7 +21,7 @@
                     <imageView clipsSubviews="YES" userInteractionEnabled="NO" contentMode="scaleAspectFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" translatesAutoresizingMaskIntoConstraints="NO" id="h3b-Mf-lD6" customClass="CachedImageView" customModule="Tusker" customModuleProvider="target">
                         <rect key="frame" x="0.0" y="0.0" width="300" height="225"/>
                         <constraints>
-                            <constraint firstAttribute="width" secondItem="h3b-Mf-lD6" secondAttribute="height" multiplier="4:3" id="QDY-8a-LYC"/>
+                            <constraint firstAttribute="width" secondItem="h3b-Mf-lD6" secondAttribute="height" multiplier="4:3" placeholder="YES" id="QDY-8a-LYC"/>
                         </constraints>
                     </imageView>
                     <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" alignment="top" spacing="4" translatesAutoresizingMaskIntoConstraints="NO" id="LpU-m4-guC">
@@ -56,9 +56,9 @@
                         </constraints>
                     </view>
                     <visualEffectView opaque="NO" contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="cWo-9n-z42">
-                        <rect key="frame" x="0.0" y="196.33333333333334" width="300" height="28.666666666666657"/>
+                        <rect key="frame" x="0.0" y="196.66666666666666" width="300" height="28.333333333333343"/>
                         <view key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" insetsLayoutMarginsFromSafeArea="NO" id="ktv-3s-cp9">
-                            <rect key="frame" x="0.0" y="0.0" width="300" height="28.666666666666657"/>
+                            <rect key="frame" x="0.0" y="0.0" width="300" height="28.333333333333343"/>
                             <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                             <subviews>
                                 <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Title" textAlignment="natural" lineBreakMode="tailTruncation" numberOfLines="2" baselineAdjustment="alignBaselines" adjustsLetterSpacingToFitWidth="YES" showsExpansionTextWhenTruncated="YES" adjustsFontForContentSizeCategory="YES" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Ho3-cU-IGi">

Tusker/Screens/Explore/TrendingLinksViewController.swift

@@ -10,19 +10,22 @@ import UIKit
 import Pachyderm
 import WebURLFoundationExtras
 import SafariServices
+import Combine
 
-class TrendingLinksViewController: EnhancedTableViewController {
+class TrendingLinksViewController: UIViewController, CollectionViewController {
     
     weak var mastodonController: MastodonController!
     
-    private var dataSource: UITableViewDiffableDataSource<Section, Item>!
+    var collectionView: UICollectionView!
+    private var dataSource: UICollectionViewDiffableDataSource<Section, Item>!
+    
+    private var state = State.unloaded
+    private let confirmLoadMore = PassthroughSubject<Void, Never>()
     
     init(mastodonController: MastodonController) {
         self.mastodonController = mastodonController
         
-        super.init(style: .grouped)
+        super.init(nibName: nil, bundle: nil)
-        
-        dragEnabled = true
     }
     
     required init?(coder: NSCoder) {
@@ -34,73 +37,259 @@ class TrendingLinksViewController: EnhancedTableViewController {
 
         title = NSLocalizedString("Trending Links", comment: "trending links screen title")
         
-        tableView.register(TrendingLinkTableViewCell.self, forCellReuseIdentifier: "trendingLinkCell")
+        let layout = UICollectionViewCompositionalLayout { [unowned self] sectionIndex, environment in
-        tableView.estimatedRowHeight = 100
+            switch dataSource.sectionIdentifier(for: sectionIndex) {
-        tableView.allowsFocus = true
+            case nil:
-        tableView.backgroundColor = .appGroupedBackground
+                fatalError()
+                
+            case .loadingIndicator:
+                var config = UICollectionLayoutListConfiguration(appearance: .grouped)
+                config.backgroundColor = .appGroupedBackground
+                config.showsSeparators = false
+                return .list(using: config, layoutEnvironment: environment)
+                
+            case .links:
+                let size = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1), heightDimension: .estimated(280))
+                let item = NSCollectionLayoutItem(layoutSize: size)
+                let item2 = NSCollectionLayoutItem(layoutSize: size)
+                let group = NSCollectionLayoutGroup.vertical(layoutSize: size, subitems: [item, item2])
+                group.contentInsets = NSDirectionalEdgeInsets(top: 0, leading: 16, bottom: 0, trailing: 16)
+                group.interItemSpacing = .fixed(16)
+                let section = NSCollectionLayoutSection(group: group)
+                section.interGroupSpacing = 16
+                section.contentInsets = NSDirectionalEdgeInsets(top: 16, leading: 0, bottom: 16, trailing: 0)
+                return section
+            }
+        }
+        collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
+        collectionView.translatesAutoresizingMaskIntoConstraints = false
+        collectionView.delegate = self
+        collectionView.dragDelegate = self
+        collectionView.backgroundColor = .appGroupedBackground
+        collectionView.allowsFocus = true
+        view.addSubview(collectionView)
+        NSLayoutConstraint.activate([
+            collectionView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+            collectionView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+            collectionView.topAnchor.constraint(equalTo: view.topAnchor),
+            collectionView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+        ])
         
-        dataSource = UITableViewDiffableDataSource(tableView: tableView, cellProvider: { tableView, indexPath, item in
+        dataSource = createDataSource()
-            let cell = tableView.dequeueReusableCell(withIdentifier: "trendingLinkCell", for: indexPath) as! TrendingLinkTableViewCell
+    }
-            cell.updateUI(card: item.card)
+    
-            return cell
+    private func createDataSource() -> UICollectionViewDiffableDataSource<Section, Item> {
-        })
+        let loadingCell = UICollectionView.CellRegistration<LoadingCollectionViewCell, Void> { cell, indexPath, itemIdentifier in
+            cell.indicator.startAnimating()
+        }
+        let linkCell = UICollectionView.CellRegistration<TrendingLinkCardCollectionViewCell, Card>(cellNib: UINib(nibName: "TrendingLinkCardCollectionViewCell", bundle: .main)) { cell, indexPath, item in
+            cell.verticalSize = .compact
+            cell.updateUI(card: item)
+        }
+        let confirmLoadMoreCell = UICollectionView.CellRegistration<ConfirmLoadMoreCollectionViewCell, Bool> { cell, indexPath, isLoading in
+            cell.confirmLoadMore = self.confirmLoadMore
+            cell.isLoading = isLoading
+        }
+        return UICollectionViewDiffableDataSource(collectionView: collectionView) { collectionView, indexPath, itemIdentifier in
+            switch itemIdentifier {
+            case .loadingIndicator:
+                return collectionView.dequeueConfiguredReusableCell(using: loadingCell, for: indexPath, item: ())
+            case .link(let card):
+                return collectionView.dequeueConfiguredReusableCell(using: linkCell, for: indexPath, item: card)
+            case .confirmLoadMore(let loading):
+                return collectionView.dequeueConfiguredReusableCell(using: confirmLoadMoreCell, for: indexPath, item: loading)
+            }
+        }
     }
     
     override func viewWillAppear(_ animated: Bool) {
         super.viewWillAppear(animated)
         
-        let request = Client.getTrendingLinks()
         Task {
-            guard let (links, _) = try? await mastodonController.run(request) else {
+            await loadInitial()
-                return
-            }
-            var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
-            snapshot.appendSections([.links])
-            snapshot.appendItems(links.map(Item.init))
-            await dataSource.apply(snapshot)
         }
     }
     
-    // MARK: - Table View Delegate
+    @MainActor
+    private func loadInitial() async {
+        guard case .unloaded = state else {
+            return
+        }
+        state = .loading
+        
+        var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
+        snapshot.appendSections([.loadingIndicator])
+        snapshot.appendItems([.loadingIndicator])
+        await dataSource.apply(snapshot)
+        
+        do {
+            let request = Client.getTrendingLinks()
+            let (links, _) = try await mastodonController.run(request)
+            snapshot.deleteSections([.loadingIndicator])
+            snapshot.appendSections([.links])
+            snapshot.appendItems(links.map { .link($0) })
+            state = .loaded
+            await dataSource.apply(snapshot)
+        } catch {
+            await dataSource.apply(NSDiffableDataSourceSnapshot())
+            state = .unloaded
+            let config = ToastConfiguration(from: error, with: "Error Loading Trending Links", in: self) { [weak self] toast in
+                toast.dismissToast(animated: true)
+                await self?.loadInitial()
+            }
+            self.showToast(configuration: config, animated: true)
+        }
+    }
     
-    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
+    @MainActor
-        guard let item = dataSource.itemIdentifier(for: indexPath),
+    private func loadOlder() async {
-              let url = URL(item.card.url) else {
+        guard case .loaded = state else {
+            return
+        }
+        state = .loadingOlder
+        
+        let origSnapshot = dataSource.snapshot()
+        var snapshot = origSnapshot
+        if Preferences.shared.disableInfiniteScrolling {
+            snapshot.appendSections([.loadingIndicator])
+            snapshot.appendItems([.confirmLoadMore(false)], toSection: .loadingIndicator)
+            await dataSource.apply(snapshot)
+            
+            for await _ in confirmLoadMore.values {
+                break
+            }
+            
+            snapshot.deleteItems([.confirmLoadMore(false)])
+            snapshot.appendItems([.confirmLoadMore(true)], toSection: .loadingIndicator)
+            await dataSource.apply(snapshot, animatingDifferences: false)
+        } else {
+            snapshot.appendSections([.loadingIndicator])
+            snapshot.appendItems([.loadingIndicator], toSection: .loadingIndicator)
+            await dataSource.apply(snapshot)
+        }
+        
+        do {
+            let request = Client.getTrendingLinks(offset: origSnapshot.itemIdentifiers.count)
+            let (links, _) = try await mastodonController.run(request)
+            var snapshot = origSnapshot
+            snapshot.appendItems(links.map { .link($0) }, toSection: .links)
+            await dataSource.apply(snapshot)
+        } catch {
+            await dataSource.apply(origSnapshot)
+            let config = ToastConfiguration(from: error, with: "Erorr Loading More Links", in: self) { [weak self] toast in
+                toast.dismissToast(animated: true)
+                await self?.loadOlder()
+            }
+            self.showToast(configuration: config, animated: true)
+        }
+    }
+    
+}
+
+extension TrendingLinksViewController {
+    enum State {
+        case unloaded
+        case loading
+        case loaded
+        case loadingOlder
+    }
+}
+
+extension TrendingLinksViewController {
+    enum Section {
+        case loadingIndicator
+        case links
+    }
+    enum Item: Hashable {
+        case loadingIndicator
+        case link(Card)
+        case confirmLoadMore(Bool)
+        
+        static func ==(lhs: Item, rhs: Item) -> Bool {
+            switch (lhs, rhs) {
+            case (.loadingIndicator, .loadingIndicator):
+                return true
+            case (.link(let a), .link(let b)):
+                return a.url == b.url
+            case (.confirmLoadMore(let a), .confirmLoadMore(let b)):
+                return a == b
+            default:
+                return false
+            }
+        }
+        
+        func hash(into hasher: inout Hasher) {
+            switch self {
+            case .loadingIndicator:
+                hasher.combine(0)
+            case .link(let card):
+                hasher.combine(1)
+                hasher.combine(card.url)
+            case .confirmLoadMore(let loading):
+                hasher.combine(2)
+                hasher.combine(loading)
+            }
+        }
+        
+        var shouldSelect: Bool {
+            if case .link(_) = self {
+                return true
+            } else {
+                return false
+            }
+        }
+    }
+}
+
+extension TrendingLinksViewController: UICollectionViewDelegate {
+    func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
+        if indexPath.section == collectionView.numberOfSections - 1,
+           indexPath.row == collectionView.numberOfItems(inSection: indexPath.section) - 1 {
+            Task {
+                await loadOlder()
+            }
+        }
+    }
+    
+    func collectionView(_ collectionView: UICollectionView, shouldSelectItemAt indexPath: IndexPath) -> Bool {
+        return dataSource.itemIdentifier(for: indexPath)?.shouldSelect ?? false
+    }
+    
+    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
+        guard case .link(let card) = dataSource.itemIdentifier(for: indexPath),
+              let url = URL(card.url) else {
             return
         }
         selected(url: url)
     }
     
-    override func tableView(_ tableView: UITableView, contextMenuConfigurationForRowAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration? {
+    func collectionView(_ collectionView: UICollectionView, contextMenuConfigurationForItemAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration? {
-        guard let item = dataSource.itemIdentifier(for: indexPath),
+        guard case .link(let card) = dataSource.itemIdentifier(for: indexPath),
-              let url = URL(item.card.url) else {
+              let url = URL(card.url),
+              let cell = collectionView.cellForItem(at: indexPath) else {
             return nil
         }
-        return UIContextMenuConfiguration(identifier: nil) {
+        return UIContextMenuConfiguration {
             let vc = SFSafariViewController(url: url)
             vc.preferredControlTintColor = Preferences.shared.accentColor.color
             return vc
         } actionProvider: { _ in
-            return UIMenu(children: self.actionsForTrendingLink(card: item.card))
+            UIMenu(children: self.actionsForTrendingLink(card: card, source: .view(cell)))
         }
     }
-
+    
+    func collectionView(_ collectionView: UICollectionView, willPerformPreviewActionForMenuWith configuration: UIContextMenuConfiguration, animator: UIContextMenuInteractionCommitAnimating) {
+        MenuPreviewHelper.willPerformPreviewAction(animator: animator, presenter: self)
+    }
 }
 
-extension TrendingLinksViewController {
+extension TrendingLinksViewController: UICollectionViewDragDelegate {
-    enum Section {
+    func collectionView(_ collectionView: UICollectionView, itemsForBeginning session: UIDragSession, at indexPath: IndexPath) -> [UIDragItem] {
-        case links
+        guard case .link(let card) = dataSource.itemIdentifier(for: indexPath),
-    }
+              let url = URL(card.url) else {
-    struct Item: Hashable {
+            return []
-        let card: Card
-        
-        static func ==(lhs: Item, rhs: Item) -> Bool {
-            return lhs.card.url == rhs.card.url
-        }
-        
-        func hash(into hasher: inout Hasher) {
-            hasher.combine(card.url)
         }
+        return [UIDragItem(itemProvider: NSItemProvider(object: url as NSURL))]
     }
 }
 

Tusker/Screens/Explore/TrendsViewController.swift

@@ -9,6 +9,7 @@
 import UIKit
 import Pachyderm
 import SafariServices
+import Combine
 
 class TrendsViewController: UIViewController, CollectionViewController {
     
@@ -18,6 +19,8 @@ class TrendsViewController: UIViewController, CollectionViewController {
     private var dataSource: UICollectionViewDiffableDataSource<Section, Item>!
     
     private var loadTask: Task<Void, Never>?
+    private var trendingStatusesState = TrendingStatusesState.unloaded
+    private let confirmLoadMoreStatuses = PassthroughSubject<Void, Never>()
     
     private var isShowingTrends = false
     private var shouldShowTrends: Bool {
@@ -42,9 +45,16 @@ class TrendsViewController: UIViewController, CollectionViewController {
         let layout = UICollectionViewCompositionalLayout { [unowned self] sectionIndex, environment in
             let sectionIdentifier = self.dataSource.snapshot().sectionIdentifiers[sectionIndex]
             switch sectionIdentifier {
+            case .loadingIndicator:
+                var listConfig = UICollectionLayoutListConfiguration(appearance: .grouped)
+                listConfig.backgroundColor = .appGroupedBackground
+                listConfig.showsSeparators = false
+                return .list(using: listConfig, layoutEnvironment: environment)
+                
             case .trendingHashtags:
                 var listConfig = UICollectionLayoutListConfiguration(appearance: .grouped)
                 listConfig.headerMode = .supplementary
+                listConfig.footerMode = .supplementary
                 listConfig.backgroundColor = .appGroupedBackground
                 return .list(using: listConfig, layoutEnvironment: environment)
                 
@@ -57,9 +67,10 @@ class TrendsViewController: UIViewController, CollectionViewController {
                 let section = NSCollectionLayoutSection(group: group)
                 section.orthogonalScrollingBehavior = .groupPaging
                 section.boundarySupplementaryItems = [
-                    NSCollectionLayoutBoundarySupplementaryItem(layoutSize: NSCollectionLayoutSize(widthDimension: .fractionalWidth(1), heightDimension: .estimated(12)), elementKind: UICollectionView.elementKindSectionHeader, alignment: .topLeading)
+                    NSCollectionLayoutBoundarySupplementaryItem(layoutSize: NSCollectionLayoutSize(widthDimension: .fractionalWidth(1), heightDimension: .estimated(12)), elementKind: UICollectionView.elementKindSectionHeader, alignment: .topLeading),
+                    NSCollectionLayoutBoundarySupplementaryItem(layoutSize: NSCollectionLayoutSize(widthDimension: .fractionalWidth(1), heightDimension: .estimated(30)), elementKind: UICollectionView.elementKindSectionFooter, alignment: .bottomLeading),
                 ]
-                section.contentInsets = NSDirectionalEdgeInsets(top: 0, leading: 0, bottom: 16, trailing: 0)
+                section.contentInsets = .zero
                 return section
 
             case .profileSuggestions:
@@ -71,15 +82,25 @@ class TrendsViewController: UIViewController, CollectionViewController {
                 let section = NSCollectionLayoutSection(group: group)
                 section.orthogonalScrollingBehavior = .groupPaging
                 section.boundarySupplementaryItems = [
-                    NSCollectionLayoutBoundarySupplementaryItem(layoutSize: NSCollectionLayoutSize(widthDimension: .fractionalWidth(1), heightDimension: .estimated(12)), elementKind: UICollectionView.elementKindSectionHeader, alignment: .topLeading)
+                    NSCollectionLayoutBoundarySupplementaryItem(layoutSize: NSCollectionLayoutSize(widthDimension: .fractionalWidth(1), heightDimension: .estimated(12)), elementKind: UICollectionView.elementKindSectionHeader, alignment: .topLeading),
+                    NSCollectionLayoutBoundarySupplementaryItem(layoutSize: NSCollectionLayoutSize(widthDimension: .fractionalWidth(1), heightDimension: .estimated(30)), elementKind: UICollectionView.elementKindSectionFooter, alignment: .bottomLeading),
                 ]
-                section.contentInsets = NSDirectionalEdgeInsets(top: 0, leading: 0, bottom: 16, trailing: 0)
+                section.contentInsets = .zero
                 return section
                 
             case .trendingStatuses:
                 var listConfig = UICollectionLayoutListConfiguration(appearance: .grouped)
                 listConfig.headerMode = .supplementary
                 listConfig.backgroundColor = .appGroupedBackground
+                listConfig.itemSeparatorHandler = { [unowned self] indexPath, sectionConfig in
+                    var config = sectionConfig
+                    if let item = dataSource.itemIdentifier(for: indexPath),
+                       item.hideListSeparators {
+                        config.topSeparatorVisibility = .hidden
+                        config.bottomSeparatorVisibility = .hidden
+                    }
+                    return config
+                }
                 return .list(using: listConfig, layoutEnvironment: environment)
             }
         }
@@ -103,7 +124,23 @@ class TrendsViewController: UIViewController, CollectionViewController {
             config.text = section.title
             headerView.contentConfiguration = config
         }
+        let moreCell = UICollectionView.SupplementaryRegistration<MoreTrendsFooterCollectionViewCell>(elementKind: UICollectionView.elementKindSectionFooter) { [unowned self] supplementaryView, elementKind, indexPath in
+            supplementaryView.delegate = self
+            switch self.dataSource.sectionIdentifier(for: indexPath.section) {
+            case nil, .loadingIndicator, .trendingStatuses:
+                fatalError()
+            case .trendingHashtags:
+                supplementaryView.updateUI(.hashtags)
+            case .trendingLinks:
+                supplementaryView.updateUI(.links)
+            case .profileSuggestions:
+                supplementaryView.updateUI(.profileSuggestions)
+            }
+        }
         
+        let loadingCell = UICollectionView.CellRegistration<LoadingCollectionViewCell, Void> { cell, indexPath, itemIdentifier in
+            cell.indicator.startAnimating()
+        }
         let trendingHashtagCell = UICollectionView.CellRegistration<TrendingHashtagCollectionViewCell, Hashtag> { (cell, indexPath, hashtag) in
             cell.updateUI(hashtag: hashtag)
         }
@@ -119,9 +156,16 @@ class TrendsViewController: UIViewController, CollectionViewController {
             cell.delegate = self
             cell.updateUI(accountID: item.0, source: item.1)
         }
+        let confirmLoadMoreCell = UICollectionView.CellRegistration<ConfirmLoadMoreCollectionViewCell, Bool> { [unowned self] cell, indexPath, isLoading in
+            cell.confirmLoadMore = self.confirmLoadMoreStatuses
+            cell.isLoading = isLoading
+        }
         
         let dataSource = UICollectionViewDiffableDataSource<Section, Item>(collectionView: collectionView) { collectionView, indexPath, item in
             switch item {
+            case .loadingIndicator:
+                return collectionView.dequeueConfiguredReusableCell(using: loadingCell, for: indexPath, item: ())
+                
             case let .tag(hashtag):
                 return collectionView.dequeueConfiguredReusableCell(using: trendingHashtagCell, for: indexPath, item: hashtag)
                 
@@ -133,11 +177,16 @@ class TrendsViewController: UIViewController, CollectionViewController {
                 
             case let .account(id, source):
                 return collectionView.dequeueConfiguredReusableCell(using: accountCell, for: indexPath, item: (id, source))
+                
+            case let .confirmLoadMoreStatuses(loading):
+                return collectionView.dequeueConfiguredReusableCell(using: confirmLoadMoreCell, for: indexPath, item: loading)
             }
         }
         dataSource.supplementaryViewProvider = { (collectionView, elementKind, indexPath) in
             if elementKind == UICollectionView.elementKindSectionHeader {
                 return collectionView.dequeueConfiguredReusableSupplementary(using: sectionHeaderCell, for: indexPath)
+            } else if elementKind == UICollectionView.elementKindSectionFooter {
+                return collectionView.dequeueConfiguredReusableSupplementary(using: moreCell, for: indexPath)
             } else {
                 return nil
             }
@@ -171,6 +220,11 @@ class TrendsViewController: UIViewController, CollectionViewController {
         }
         
         var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
+        snapshot.appendSections([.loadingIndicator])
+        snapshot.appendItems([.loadingIndicator])
+        await apply(snapshot: snapshot)
+        
+        snapshot = NSDiffableDataSourceSnapshot()
 
         let hashtagsReq = Client.getTrendingHashtags(limit: 5)
         let hashtags = try? await mastodonController.run(hashtagsReq).0
@@ -214,9 +268,60 @@ class TrendsViewController: UIViewController, CollectionViewController {
 
         if !Task.isCancelled {
             await apply(snapshot: snapshot)
+            if snapshot.sectionIdentifiers.contains(.trendingStatuses) {
+                self.trendingStatusesState = .loaded
+            } else {
+                self.trendingStatusesState = .unloaded
+            }
         }
     }
     
+    @MainActor
+    private func loadOlderStatuses() async {
+        guard case .loaded = trendingStatusesState else {
+            return
+        }
+        trendingStatusesState = .loadingOlder
+        
+        let origSnapshot = dataSource.snapshot()
+        var snapshot = origSnapshot
+        if Preferences.shared.disableInfiniteScrolling {
+            snapshot.appendItems([.confirmLoadMoreStatuses(false)], toSection: .trendingStatuses)
+            await apply(snapshot: snapshot)
+            
+            for await _ in confirmLoadMoreStatuses.values {
+                break
+            }
+            
+            snapshot.deleteItems([.confirmLoadMoreStatuses(false)])
+            snapshot.appendItems([.confirmLoadMoreStatuses(true)], toSection: .trendingStatuses)
+            await apply(snapshot: snapshot, animatingDifferences: false)
+        } else {
+            snapshot.appendItems([.loadingIndicator], toSection: .trendingStatuses)
+            await apply(snapshot: snapshot)
+        }
+        
+        do {
+            let request = Client.getTrendingStatuses(offset: origSnapshot.itemIdentifiers(inSection: .trendingStatuses).count)
+            let (statuses, _) = try await mastodonController.run(request)
+            
+            await mastodonController.persistentContainer.addAll(statuses: statuses)
+            
+            var snapshot = origSnapshot
+            snapshot.appendItems(statuses.map { .status($0.id, .unknown) }, toSection: .trendingStatuses)
+            await apply(snapshot: snapshot)
+        } catch {
+            await apply(snapshot: origSnapshot)
+            let config = ToastConfiguration(from: error, with: "Error Loading More Trending Statuses", in: self) { [weak self] toast in
+                toast.dismissToast(animated: true)
+                await self?.loadOlderStatuses()
+            }
+            showToast(configuration: config, animated: true)
+        }
+        
+        trendingStatusesState = .loaded
+    }
+    
     @objc private func preferencesChanged() {
         if isShowingTrends != shouldShowTrends {
             loadTask?.cancel()
@@ -226,9 +331,9 @@ class TrendsViewController: UIViewController, CollectionViewController {
         }
     }
     
-    private func apply(snapshot: NSDiffableDataSourceSnapshot<Section, Item>) async {
+    private func apply(snapshot: NSDiffableDataSourceSnapshot<Section, Item>, animatingDifferences: Bool = true) async {
         await Task { @MainActor in
-            self.dataSource.apply(snapshot)
+            self.dataSource.apply(snapshot, animatingDifferences: animatingDifferences)
         }.value
     }
     
@@ -251,15 +356,26 @@ class TrendsViewController: UIViewController, CollectionViewController {
     }
 }
 
+extension TrendsViewController {
+    enum TrendingStatusesState {
+        case unloaded
+        case loaded
+        case loadingOlder
+    }
+}
+
 extension TrendsViewController {
     enum Section {
+        case loadingIndicator
         case trendingHashtags
         case trendingLinks
         case profileSuggestions
         case trendingStatuses
         
-        var title: String {
+        var title: String? {
             switch self {
+            case .loadingIndicator:
+                return nil
             case .trendingHashtags:
                 return "Trending Hashtags"
             case .trendingLinks:
@@ -272,13 +388,17 @@ extension TrendsViewController {
         }
     }
     enum Item: Equatable, Hashable {
+        case loadingIndicator
         case status(String, CollapseState)
         case tag(Hashtag)
         case link(Card)
         case account(String, Suggestion.Source)
+        case confirmLoadMoreStatuses(Bool)
         
         static func == (lhs: Item, rhs: Item) -> Bool {
             switch (lhs, rhs) {
+            case (.loadingIndicator, .loadingIndicator):
+                return true
             case let (.status(a, _), .status(b, _)):
                 return a == b
             case let (.tag(a), .tag(b)):
@@ -287,6 +407,8 @@ extension TrendsViewController {
                 return a.url == b.url
             case let (.account(a, _), .account(b, _)):
                 return a == b
+            case (.confirmLoadMoreStatuses(let a), .confirmLoadMoreStatuses(let b)):
+                return a == b
             default:
                 return false
             }
@@ -294,6 +416,8 @@ extension TrendsViewController {
         
         func hash(into hasher: inout Hasher) {
             switch self {
+            case .loadingIndicator:
+                hasher.combine("loadingIndicator")
             case let .status(id, _):
                 hasher.combine("status")
                 hasher.combine(id)
@@ -306,17 +430,54 @@ extension TrendsViewController {
             case let .account(id, _):
                 hasher.combine("account")
                 hasher.combine(id)
+            case let .confirmLoadMoreStatuses(loading):
+                hasher.combine("confirmLoadMoreStatuses")
+                hasher.combine(loading)
+            }
+        }
+        
+        var shouldSelect: Bool {
+            switch self {
+            case .loadingIndicator, .confirmLoadMoreStatuses(_):
+                return false
+            default:
+                return true
+            }
+        }
+        
+        var hideListSeparators: Bool {
+            switch self {
+            case .loadingIndicator, .confirmLoadMoreStatuses(_):
+                return true
+            default:
+                return false
             }
         }
     }
 }
 
 extension TrendsViewController: UICollectionViewDelegate {
+    func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
+        if case .trendingStatuses = dataSource.sectionIdentifier(for: indexPath.section),
+           indexPath.row == collectionView.numberOfItems(inSection: indexPath.section) - 1 {
+            Task {
+                await self.loadOlderStatuses()
+            }
+        }
+    }
+    
+    func collectionView(_ collectionView: UICollectionView, shouldSelectItemAt indexPath: IndexPath) -> Bool {
+        return dataSource.itemIdentifier(for: indexPath)?.shouldSelect ?? false
+    }
+    
     func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
         guard let item = dataSource.itemIdentifier(for: indexPath) else {
             return
         }
         switch item {
+        case .loadingIndicator, .confirmLoadMoreStatuses(_):
+            return
+            
         case let .tag(hashtag):
             show(HashtagTimelineViewController(for: hashtag, mastodonController: mastodonController), sender: nil)
             
@@ -340,6 +501,9 @@ extension TrendsViewController: UICollectionViewDelegate {
         }
         
         switch item {
+        case .loadingIndicator, .confirmLoadMoreStatuses(_):
+            return nil
+            
         case let .tag(hashtag):
             return UIContextMenuConfiguration(identifier: nil) {
                 HashtagTimelineViewController(for: hashtag, mastodonController: self.mastodonController)
@@ -351,12 +515,13 @@ extension TrendsViewController: UICollectionViewDelegate {
             guard let url = URL(card.url) else {
                 return nil
             }
+            let cell = collectionView.cellForItem(at: indexPath)!
             return UIContextMenuConfiguration {
                 let vc = SFSafariViewController(url: url)
                 vc.preferredControlTintColor = Preferences.shared.accentColor.color
                 return vc
             } actionProvider: { _ in
-                UIMenu(children: self.actionsForTrendingLink(card: card))
+                UIMenu(children: self.actionsForTrendingLink(card: card, source: .view(cell)))
             }
             
         case let .status(id, state):
@@ -424,6 +589,9 @@ extension TrendsViewController: UICollectionViewDragDelegate {
                   return []
               }
         switch item {
+        case .loadingIndicator, .confirmLoadMoreStatuses(_):
+            return []
+            
         case let .tag(hashtag):
             guard let url = URL(hashtag.url) else {
                 return []

Tusker/Screens/Utilities/Previewing.swift

@@ -346,12 +346,16 @@ extension MenuActionProvider {
         }
     }
     
-    func actionsForTrendingLink(card: Card) -> [UIMenuElement] {
+    func actionsForTrendingLink(card: Card, source: PopoverSource) -> [UIMenuElement] {
         guard let url = URL(card.url) else {
             return []
         }
         return [
             openInSafariAction(url: url),
+            createAction(identifier: "share", title: "Share", systemImageName: "square.and.arrow.up", handler: { [weak self] (_) in
+                guard let self else { return }
+                self.navigationDelegate?.showMoreOptions(forURL: url, source: source)
+            }),
             createAction(identifier: "postlink", title: "Post this Link", systemImageName: "square.and.pencil", handler: { [weak self] _ in
                 guard let self = self else { return }
                 let draft = self.mastodonController!.createDraft()

Tusker/Views/Confirm Load More Cell/ConfirmLoadMoreCollectionViewCell.swift

@@ -28,7 +28,7 @@ class ConfirmLoadMoreCollectionViewCell: UICollectionViewCell {
     override init(frame: CGRect) {
         super.init(frame: frame)
         
-        backgroundColor = .systemGroupedBackground
+        backgroundColor = .appGroupedBackground
         
         let label = UILabel()
         label.text = "Infinite scrolling is off. Do you want to keep going?"