Show message on remote profiles with no statuses

Closes #279

Tusker.xcodeproj/project.pbxproj

@@ -222,6 +222,7 @@
 		D690797324A4EF9700023A34 /* UIBezierPath+Helpers.swift in Sources */ = {isa = PBXBuildFile; fileRef = D690797224A4EF9700023A34 /* UIBezierPath+Helpers.swift */; };
 		D691771129A2B76A0054D7EF /* MainActor+Unsafe.swift in Sources */ = {isa = PBXBuildFile; fileRef = D691771029A2B76A0054D7EF /* MainActor+Unsafe.swift */; };
 		D691771529A6FCAB0054D7EF /* StateRestorableViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D691771429A6FCAB0054D7EF /* StateRestorableViewController.swift */; };
+		D691771729A710520054D7EF /* ProfileNoContentCollectionViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = D691771629A710520054D7EF /* ProfileNoContentCollectionViewCell.swift */; };
 		D693A72825CF282E003A14E2 /* TrendingHashtagsViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D693A72725CF282E003A14E2 /* TrendingHashtagsViewController.swift */; };
 		D693A72A25CF8C1E003A14E2 /* ProfileDirectoryViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D693A72925CF8C1E003A14E2 /* ProfileDirectoryViewController.swift */; };
 		D693A72F25CF91C6003A14E2 /* FeaturedProfileCollectionViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = D693A72D25CF91C6003A14E2 /* FeaturedProfileCollectionViewCell.swift */; };
@@ -639,6 +640,7 @@
 		D690797224A4EF9700023A34 /* UIBezierPath+Helpers.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "UIBezierPath+Helpers.swift"; sourceTree = "<group>"; };
 		D691771029A2B76A0054D7EF /* MainActor+Unsafe.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "MainActor+Unsafe.swift"; sourceTree = "<group>"; };
 		D691771429A6FCAB0054D7EF /* StateRestorableViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = StateRestorableViewController.swift; sourceTree = "<group>"; };
+		D691771629A710520054D7EF /* ProfileNoContentCollectionViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ProfileNoContentCollectionViewCell.swift; sourceTree = "<group>"; };
 		D693A72725CF282E003A14E2 /* TrendingHashtagsViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TrendingHashtagsViewController.swift; sourceTree = "<group>"; };
 		D693A72925CF8C1E003A14E2 /* ProfileDirectoryViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ProfileDirectoryViewController.swift; sourceTree = "<group>"; };
 		D693A72D25CF91C6003A14E2 /* FeaturedProfileCollectionViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FeaturedProfileCollectionViewCell.swift; sourceTree = "<group>"; };
@@ -1096,6 +1098,7 @@
 				D61DC84C28F500D200B82C6E /* ProfileViewController.swift */,
 				D61ABEF728EFC3F900B29151 /* ProfileStatusesViewController.swift */,
 				D61DC84A28F4FD2000B82C6E /* ProfileHeaderCollectionViewCell.swift */,
+				D691771629A710520054D7EF /* ProfileNoContentCollectionViewCell.swift */,
 			);
 			path = Profile;
 			sourceTree = "<group>";
@@ -1969,6 +1972,7 @@
 				0427033A22B31269000D31B6 /* AdvancedPrefsView.swift in Sources */,
 				D6C3F4F5298ED0890009FCFF /* LocalPredicateStatusesViewController.swift in Sources */,
 				D662AEEF263A3B880082A153 /* PollFinishedTableViewCell.swift in Sources */,
+				D691771729A710520054D7EF /* ProfileNoContentCollectionViewCell.swift in Sources */,
 				D626493C23C1000300612E6E /* AlbumTableViewCell.swift in Sources */,
 				D62275A624F1C81800B82A16 /* ComposeReplyView.swift in Sources */,
 				D60E2F292442372B005F8713 /* AccountMO.swift in Sources */,

Tusker/Screens/Profile/ProfileNoContentCollectionViewCell.swift

@@ -0,0 +1,81 @@
+//
+//  ProfileNoContentCollectionViewCell.swift
+//  Tusker
+//
+//  Created by Shadowfacts on 2/22/23.
+//  Copyright © 2023 Shadowfacts. All rights reserved.
+//
+
+import UIKit
+
+class ProfileNoContentCollectionViewCell: UICollectionViewListCell {
+    
+    weak var delegate: TuskerNavigationDelegate?
+    private var accountURL: URL?
+    
+    private var button: UIButton!
+    
+    override init(frame: CGRect) {
+        super.init(frame: frame)
+        
+        let title = UILabel()
+        title.text = "There's nothing here"
+        title.adjustsFontForContentSizeCategory = true
+        title.font = .preferredFont(forTextStyle: .headline)
+        title.numberOfLines = 0
+        title.textAlignment = .center
+        title.textColor = .secondaryLabel
+        
+        let body = UILabel()
+        body.text = "Your instance may not show all of the posts from accounts on other instances."
+        body.adjustsFontForContentSizeCategory = true
+        body.font = .preferredFont(forTextStyle: .body)
+        body.numberOfLines = 0
+        body.textAlignment = .center
+        body.textColor = .secondaryLabel
+        
+        button = UIButton(configuration: .plain(), primaryAction: UIAction(handler: { [unowned self] _ in
+            if let delegate = self.delegate,
+               let accountURL = self.accountURL {
+                delegate.selected(url: accountURL)
+            }
+        }))
+        
+        let stack = UIStackView(arrangedSubviews: [
+            title,
+            body,
+            button,
+        ])
+        stack.axis = .vertical
+        stack.alignment = .center
+        stack.spacing = 4
+        stack.translatesAutoresizingMaskIntoConstraints = false
+        contentView.addSubview(stack)
+        NSLayoutConstraint.activate([
+            stack.leadingAnchor.constraint(equalToSystemSpacingAfter: contentView.leadingAnchor, multiplier: 1),
+            contentView.trailingAnchor.constraint(equalToSystemSpacingAfter: stack.trailingAnchor, multiplier: 1),
+            stack.topAnchor.constraint(equalToSystemSpacingBelow: contentView.topAnchor, multiplier: 1),
+            contentView.bottomAnchor.constraint(equalToSystemSpacingBelow: stack.bottomAnchor, multiplier: 1),
+        ])
+    }
+    
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    func updateUI(accountURL: URL) {
+        self.accountURL = accountURL
+        
+        var title: AttributedString = "View on "
+        var host = AttributedString(accountURL.host!)
+        host.font = .preferredFont(forTextStyle: .body).withTraits(.traitBold)
+        title += host
+        
+        var config = UIButton.Configuration.plain()
+        config.attributedTitle = title
+        config.image = UIImage(systemName: "safari")
+        config.imagePadding = 4
+        button.configuration = config
+    }
+    
+}

Tusker/Screens/Profile/ProfileStatusesViewController.swift

@@ -159,6 +159,10 @@ class ProfileStatusesViewController: UIViewController, TimelineLikeCollectionVie
         }
         let zeroHeightCell = UICollectionView.CellRegistration<ZeroHeightCollectionViewCell, Void> { _, _, _ in
         }
+        let noContentCell = UICollectionView.CellRegistration<ProfileNoContentCollectionViewCell, URL> { [unowned self] cell, _, item in
+            cell.delegate = self
+            cell.updateUI(accountURL: item)
+        }
         return UICollectionViewDiffableDataSource(collectionView: collectionView) { [unowned self] collectionView, indexPath, itemIdentifier in
             switch itemIdentifier {
             case .header(let id):
@@ -197,6 +201,8 @@ class ProfileStatusesViewController: UIViewController, TimelineLikeCollectionVie
                 return loadingIndicatorCell(for: indexPath)
             case .confirmLoadMore:
                 return confirmLoadMoreCell(for: indexPath)
+            case .noContent(let accountURL):
+                return collectionView.dequeueConfiguredReusableCell(using: noContentCell, for: indexPath, item: accountURL)
             }
         }
     }
@@ -225,7 +231,7 @@ class ProfileStatusesViewController: UIViewController, TimelineLikeCollectionVie
         guard isViewLoaded,
               let accountID,
               state == .unloaded,
-              mastodonController.persistentContainer.account(for: accountID) != nil else {
+              let account = mastodonController.persistentContainer.account(for: accountID) else {
             return
         }
         
@@ -246,6 +252,14 @@ class ProfileStatusesViewController: UIViewController, TimelineLikeCollectionVie
         await controller.loadInitial()
         await tryLoadPinned()
         
+        var newSnapshot = dataSource.snapshot()
+        if newSnapshot.numberOfItems(inSection: .pinned) == 0,
+           newSnapshot.numberOfItems(inSection: .statuses) == 0,
+           account.url.host != mastodonController.instanceURL.host {
+            newSnapshot.appendItems([.noContent(accountURL: account.url)], toSection: .pinned)
+            await apply(newSnapshot, animatingDifferences: true)
+        }
+        
         state = .loaded
         
         // remove any content inset that was added when switching pages to this VC
@@ -410,6 +424,7 @@ extension ProfileStatusesViewController {
         case status(id: String, collapseState: CollapseState, filterState: FilterState, pinned: Bool)
         case loadingIndicator
         case confirmLoadMore
+        case noContent(accountURL: URL)
         
         static func fromTimelineItem(_ item: String) -> Self {
             return .status(id: item, collapseState: .unknown, filterState: .unknown, pinned: false)
@@ -425,6 +440,8 @@ extension ProfileStatusesViewController {
                 return true
             case (.confirmLoadMore, .confirmLoadMore):
                 return true
+            case (.noContent(let a), .noContent(let b)):
+                return a == b
             default:
                 return false
             }
@@ -443,12 +460,15 @@ extension ProfileStatusesViewController {
                 hasher.combine(2)
             case .confirmLoadMore:
                 hasher.combine(3)
+            case .noContent(let accountURL):
+                hasher.combine(4)
+                hasher.combine(accountURL)
             }
         }
         
         var hideSeparators: Bool {
             switch self {
-            case .loadingIndicator, .confirmLoadMore:
+            case .loadingIndicator, .confirmLoadMore, .noContent(_):
                 return true
             default:
                 return false