Add preference for inverted alt text badge

Closes #423

Packages/TuskerPreferences/Sources/TuskerPreferences/Preferences.swift

@@ -87,6 +87,7 @@ public final class Preferences: Codable, ObservableObject {
         self.automaticallyPlayGifs = try container.decode(Bool.self, forKey: .automaticallyPlayGifs)
         self.showUncroppedMediaInline = try container.decodeIfPresent(Bool.self, forKey: .showUncroppedMediaInline) ?? true
         self.showAttachmentBadges = try container.decodeIfPresent(Bool.self, forKey: .showAttachmentBadges) ?? true
+        self.attachmentAltBadgeInverted = try container.decodeIfPresent(Bool.self, forKey: .attachmentAltBadgeInverted) ?? false
         
         self.openLinksInApps = try container.decode(Bool.self, forKey: .openLinksInApps)
         self.useInAppSafari = try container.decode(Bool.self, forKey: .useInAppSafari)
@@ -145,6 +146,7 @@ public final class Preferences: Codable, ObservableObject {
         try container.encode(automaticallyPlayGifs, forKey: .automaticallyPlayGifs)
         try container.encode(showUncroppedMediaInline, forKey: .showUncroppedMediaInline)
         try container.encode(showAttachmentBadges, forKey: .showAttachmentBadges)
+        try container.encode(attachmentAltBadgeInverted, forKey: .attachmentAltBadgeInverted)
         
         try container.encode(openLinksInApps, forKey: .openLinksInApps)
         try container.encode(useInAppSafari, forKey: .useInAppSafari)
@@ -211,6 +213,7 @@ public final class Preferences: Codable, ObservableObject {
     @Published public var automaticallyPlayGifs = true
     @Published public var showUncroppedMediaInline = true
     @Published public var showAttachmentBadges = true
+    @Published public var attachmentAltBadgeInverted = false
     
     // MARK: Behavior
     @Published public var openLinksInApps = true
@@ -274,6 +277,7 @@ public final class Preferences: Codable, ObservableObject {
         case automaticallyPlayGifs
         case showUncroppedMediaInline
         case showAttachmentBadges
+        case attachmentAltBadgeInverted
         
         case openLinksInApps
         case useInAppSafari

Tusker/Screens/Preferences/MediaPrefsView.swift

@@ -44,8 +44,13 @@ struct MediaPrefsView: View {
             }
             
             Toggle(isOn: $preferences.showAttachmentBadges) {
-                Text("Show GIF/ALT Badges")
+                Text("Show GIF/\(Text("Alt").font(.body.lowercaseSmallCaps())) Badges")
             }
+            
+            Toggle(isOn: $preferences.attachmentAltBadgeInverted) {
+                Text("Show Badge when Missing \(Text("Alt").font(.body.lowercaseSmallCaps()))")
+            }
+            .disabled(!preferences.showAttachmentBadges)
         }
         .appGroupedListRowBackground()
     }

Tusker/Views/Attachments/AttachmentView.swift

@@ -30,6 +30,8 @@ class AttachmentView: GIFImageView {
     var attachment: Attachment!
     var index: Int!
     
+    private var currentBadges: Badges = []
+    
     private var loadAttachmentTask: Task<Void, Never>?
     private var source: Source?
     var attachmentImage: UIImage? {
@@ -103,8 +105,9 @@ class AttachmentView: GIFImageView {
             }
         }
         
-        if getBadges().isEmpty != Preferences.shared.showAttachmentBadges {
-            createBadgesView(getBadges())
+        let newBadges = getBadges()
+        if currentBadges != newBadges {
+            createBadgesView(newBadges)
         }
     }
     
@@ -175,8 +178,13 @@ class AttachmentView: GIFImageView {
             return []
         }
         var badges: Badges = []
-        if attachment.description?.isEmpty == false {
+        let hasDescription = attachment.description?.isEmpty == false
+        if hasDescription,
+           !Preferences.shared.attachmentAltBadgeInverted {
             badges.formUnion(.alt)
+        } else if !hasDescription,
+                  Preferences.shared.attachmentAltBadgeInverted {
+            badges.formUnion(.noAlt)
         }
         if attachment.kind == .gifv || attachment.url.pathExtension == "gif" {
             badges.formUnion(.gif)
@@ -354,6 +362,8 @@ class AttachmentView: GIFImageView {
     }
     
     private func createBadgesView(_ badges: Badges) {
+        currentBadges = badges
+        
         guard !badges.isEmpty else {
             badgeContainer?.removeFromSuperview()
             badgeContainer = nil
@@ -393,6 +403,9 @@ class AttachmentView: GIFImageView {
         if badges.contains(.alt) {
             makeBadgeView(text: "ALT")
         }
+        if badges.contains(.noAlt) {
+            makeBadgeView(text: "No ALT")
+        }
         
         let first = stack.arrangedSubviews.first!
         first.layer.masksToBounds = true
@@ -445,6 +458,7 @@ fileprivate extension AttachmentView {
     struct Badges: OptionSet {
         static let gif = Badges(rawValue: 1 << 0)
         static let alt = Badges(rawValue: 1 << 1)
+        static let noAlt = Badges(rawValue: 1 << 2)
         
         let rawValue: Int
     }