Convert follow notification to collection view cell

Tusker.xcodeproj/project.pbxproj

@@ -122,6 +122,7 @@
 		D646DCAE2A06C8C90059ECEB /* ProfileFieldVerificationView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D646DCAD2A06C8C90059ECEB /* ProfileFieldVerificationView.swift */; };
 		D646DCD22A06F2510059ECEB /* NotificationsCollectionViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D646DCD12A06F2510059ECEB /* NotificationsCollectionViewController.swift */; };
 		D646DCD42A0729440059ECEB /* ActionNotificationGroupCollectionViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = D646DCD32A0729440059ECEB /* ActionNotificationGroupCollectionViewCell.swift */; };
+		D646DCD62A07ED970059ECEB /* FollowNotificationGroupCollectionViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = D646DCD52A07ED970059ECEB /* FollowNotificationGroupCollectionViewCell.swift */; };
 		D647D92824257BEB0005044F /* AttachmentPreviewViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D647D92724257BEB0005044F /* AttachmentPreviewViewController.swift */; };
 		D64AAE9126C80DC600FC57FB /* ToastView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D64AAE9026C80DC600FC57FB /* ToastView.swift */; };
 		D64AAE9526C88C5000FC57FB /* ToastableViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D64AAE9426C88C5000FC57FB /* ToastableViewController.swift */; };
@@ -519,6 +520,7 @@
 		D646DCAD2A06C8C90059ECEB /* ProfileFieldVerificationView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ProfileFieldVerificationView.swift; sourceTree = "<group>"; };
 		D646DCD12A06F2510059ECEB /* NotificationsCollectionViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NotificationsCollectionViewController.swift; sourceTree = "<group>"; };
 		D646DCD32A0729440059ECEB /* ActionNotificationGroupCollectionViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ActionNotificationGroupCollectionViewCell.swift; sourceTree = "<group>"; };
+		D646DCD52A07ED970059ECEB /* FollowNotificationGroupCollectionViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FollowNotificationGroupCollectionViewCell.swift; sourceTree = "<group>"; };
 		D647D92724257BEB0005044F /* AttachmentPreviewViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AttachmentPreviewViewController.swift; sourceTree = "<group>"; };
 		D64AAE9026C80DC600FC57FB /* ToastView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ToastView.swift; sourceTree = "<group>"; };
 		D64AAE9426C88C5000FC57FB /* ToastableViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ToastableViewController.swift; sourceTree = "<group>"; };
@@ -1075,6 +1077,7 @@
 				D65234E02561AA68001AF9CF /* NotificationsTableViewController.swift */,
 				D646DCD12A06F2510059ECEB /* NotificationsCollectionViewController.swift */,
 				D646DCD32A0729440059ECEB /* ActionNotificationGroupCollectionViewCell.swift */,
+				D646DCD52A07ED970059ECEB /* FollowNotificationGroupCollectionViewCell.swift */,
 			);
 			path = Notifications;
 			sourceTree = "<group>";
@@ -2073,6 +2076,7 @@
 				D693A72F25CF91C6003A14E2 /* FeaturedProfileCollectionViewCell.swift in Sources */,
 				D627943223A5466600D38C68 /* SelectableTableViewCell.swift in Sources */,
 				D6EAE0DB2550CC8A002DB0AC /* FocusableTextField.swift in Sources */,
+				D646DCD62A07ED970059ECEB /* FollowNotificationGroupCollectionViewCell.swift in Sources */,
 				D623A53D2635F5590095BD04 /* StatusPollView.swift in Sources */,
 				D64AAE9726C88DC400FC57FB /* ToastConfiguration.swift in Sources */,
 				D63661C02381C144004B9E16 /* PreferencesNavigationController.swift in Sources */,

Tusker/Screens/Notifications/FollowNotificationGroupCollectionViewCell.swift

@@ -0,0 +1,212 @@
+//
+//  FollowNotificationGroupCollectionViewCell.swift
+//  Tusker
+//
+//  Created by Shadowfacts on 5/7/23.
+//  Copyright © 2023 Shadowfacts. All rights reserved.
+//
+
+import UIKit
+import Pachyderm
+
+class FollowNotificationGroupCollectionViewCell: UICollectionViewCell {
+    
+    private let iconView = UIImageView(image: UIImage(systemName: "person.fill.badge.plus")).configure {
+        $0.contentMode = .scaleAspectFit
+        NSLayoutConstraint.activate([
+            $0.heightAnchor.constraint(equalToConstant: 30),
+            $0.widthAnchor.constraint(equalToConstant: 30),
+        ])
+    }
+    
+    private let avatarStack = UIStackView().configure {
+        $0.axis = .horizontal
+        $0.alignment = .fill
+        $0.spacing = 8
+    }
+    
+    private let timestampLabel = UILabel().configure {
+        $0.textColor = .secondaryLabel
+        $0.font = UIFont(descriptor: .preferredFontDescriptor(withTextStyle: .body).addingAttributes([
+            .traits: [
+                UIFontDescriptor.TraitKey.weight: UIFont.Weight.light.rawValue,
+            ]
+        ]), size: 0)
+        $0.adjustsFontForContentSizeCategory = true
+    }
+    
+    private lazy var hStack = UIStackView(arrangedSubviews: [
+        avatarStack,
+        UIView().configure {
+            $0.backgroundColor = .clear
+            $0.setContentHuggingPriority(.init(249), for: .horizontal)
+        },
+        timestampLabel,
+    ]).configure {
+        $0.axis = .horizontal
+        $0.alignment = .fill
+        let heightConstraint = $0.heightAnchor.constraint(equalToConstant: 30)
+        heightConstraint.priority = .init(999)
+        heightConstraint.isActive = true
+    }
+    
+    private lazy var actionLabel = MultiSourceEmojiLabel().configure {
+        $0.font = .preferredFont(forTextStyle: .body)
+        $0.adjustsFontForContentSizeCategory = true
+        $0.numberOfLines = 2
+        $0.lineBreakMode = .byTruncatingTail
+        $0.combiner = { [unowned self] in self.updateActionLabel(names: $0) }
+    }
+    
+    private lazy var vStack = UIStackView(arrangedSubviews: [
+        hStack,
+        actionLabel,
+    ]).configure {
+        $0.axis = .vertical
+        $0.alignment = .fill
+    }
+    
+    weak var delegate: (TuskerNavigationDelegate & MenuActionProvider)?
+    private var mastodonController: MastodonController { delegate!.apiController }
+    
+    private var group: NotificationGroup!
+    
+    private var updateTimestampWorkItem: DispatchWorkItem?
+    
+    deinit {
+        updateTimestampWorkItem?.cancel()
+    }
+    
+    override init(frame: CGRect) {
+        super.init(frame: frame)
+        
+        iconView.translatesAutoresizingMaskIntoConstraints = false
+        contentView.addSubview(iconView)
+        vStack.translatesAutoresizingMaskIntoConstraints = false
+        contentView.addSubview(vStack)
+        NSLayoutConstraint.activate([
+            iconView.topAnchor.constraint(equalTo: vStack.topAnchor),
+            iconView.trailingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: 16 + 50),
+            
+            vStack.leadingAnchor.constraint(equalTo: iconView.trailingAnchor, constant: 8),
+            vStack.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -16),
+            vStack.topAnchor.constraint(equalTo: contentView.topAnchor, constant: 8),
+            vStack.bottomAnchor.constraint(equalTo: contentView.bottomAnchor, constant: -8),
+        ])
+        
+        NotificationCenter.default.addObserver(self, selector: #selector(updateUIForPreferences), name: .preferencesChanged, object: nil)
+    }
+    
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    override func updateConfiguration(using state: UICellConfigurationState) {
+        backgroundConfiguration = .appListPlainCell(for: state)
+    }
+    
+    func updateUI(group: NotificationGroup) {
+        guard group.kind == .follow else {
+            fatalError()
+        }
+        self.group = group
+        
+        let people = group.notifications.compactMap { mastodonController.persistentContainer.account(for: $0.account.id) }
+
+        actionLabel.setEmojis(pairs: people.map {
+            ($0.displayOrUserName, $0.emojis)
+        }, identifier: group.id)
+        updateTimestamp()
+        
+        avatarStack.arrangedSubviews.forEach { $0.removeFromSuperview() }
+        for avatarURL in people.lazy.compactMap(\.avatar).prefix(10) {
+            let imageView = CachedImageView(cache: .avatars)
+            imageView.layer.masksToBounds = true
+            imageView.layer.cornerRadius = Preferences.shared.avatarStyle.cornerRadiusFraction * 30
+            imageView.update(for: avatarURL)
+            avatarStack.addArrangedSubview(imageView)
+        }
+        NSLayoutConstraint.activate(avatarStack.arrangedSubviews.map {
+            $0.widthAnchor.constraint(equalTo: $0.heightAnchor)
+        })
+    }
+    
+    private func updateActionLabel(names: [NSAttributedString]) -> NSAttributedString {
+        // todo: figure out how to localize this
+        let str = NSMutableAttributedString(string: "Followed by ")
+        switch names.count {
+        case 1:
+            str.append(names.first!)
+        case 2:
+            str.append(names.first!)
+            str.append(NSAttributedString(string: " and "))
+            str.append(names.last!)
+        default:
+            for (index, name) in names.enumerated() {
+                str.append(name)
+                if index < names.count - 2 {
+                    str.append(NSAttributedString(string: ", "))
+                } else if index == names.count - 2 {
+                    str.append(NSAttributedString(string: ", and "))
+                }
+            }
+        }
+        return str
+    }
+    
+    @objc private func updateUIForPreferences() {
+        for view in avatarStack.arrangedSubviews {
+            view.layer.cornerRadius = Preferences.shared.avatarStyle.cornerRadius(for: view)
+        }
+    }
+    
+    private func updateTimestamp() {
+        guard let notification = group.notifications.first else {
+                fatalError("Missing cached notification")
+        }
+        
+        timestampLabel.text = notification.createdAt.timeAgoString()
+        
+        let delay: DispatchTimeInterval?
+        switch notification.createdAt.timeAgo().1 {
+        case .second:
+            delay = .seconds(10)
+        case .minute:
+            delay = .seconds(60)
+        default:
+            delay = nil
+        }
+        if let delay = delay {
+            if updateTimestampWorkItem == nil {
+                updateTimestampWorkItem = DispatchWorkItem { [weak self] in
+                    self?.updateTimestamp()
+                }
+            }
+            DispatchQueue.main.asyncAfter(deadline: .now() + delay, execute: updateTimestampWorkItem!)
+        } else {
+            updateTimestampWorkItem = nil
+        }
+    }
+    
+    override func prepareForReuse() {
+        super.prepareForReuse()
+        updateTimestampWorkItem?.cancel()
+    }
+    
+    // MARK: Accessibility
+    
+    override var accessibilityLabel: String? {
+        get {
+            let first = group.notifications.first!
+            var str = "Followed by "
+            str += first.account.displayNameWithoutCustomEmoji
+            if group.notifications.count > 1 {
+                str += " and \(group.notifications.count - 1) more"
+            }
+            str += ", \(first.createdAt.formatted(.relative(presentation: .numeric)))"
+            return str
+        }
+        set {}
+    }
+
+}

Tusker/Screens/Notifications/NotificationsCollectionViewController.swift

@@ -87,6 +87,10 @@ class NotificationsCollectionViewController: UIViewController, TimelineLikeColle
             cell.delegate = self
             cell.updateUI(group: itemIdentifier)
         }
+        let followCell = UICollectionView.CellRegistration<FollowNotificationGroupCollectionViewCell, NotificationGroup> { [unowned self] cell, indexPath, itemIdentifier in
+            cell.delegate = self
+            cell.updateUI(group: itemIdentifier)
+        }
         let unknownCell = UICollectionView.CellRegistration<UICollectionViewListCell, ()> { cell, indexPath, itemIdentifier in
             var config = cell.defaultContentConfiguration()
             config.text = "Unknown Notification"
@@ -100,6 +104,8 @@ class NotificationsCollectionViewController: UIViewController, TimelineLikeColle
                     return collectionView.dequeueConfiguredReusableCell(using: statusCell, for: indexPath, item: group)
                 case .favourite, .reblog:
                     return collectionView.dequeueConfiguredReusableCell(using: actionGroupCell, for: indexPath, item: group)
+                case .follow:
+                    return collectionView.dequeueConfiguredReusableCell(using: followCell, for: indexPath, item: group)
                 default:
                     return collectionView.dequeueConfiguredReusableCell(using: unknownCell, for: indexPath, item: ())
                 }