Fix update on LoadableImage (#973)

* Refactor LoadableImage

* Cleanup

ElementX/Sources/Other/SwiftUI/Views/LoadableAvatarImage.swift

@@ -53,9 +53,6 @@ struct LoadableAvatarImage: View {
             } placeholder: {
                 PlaceholderAvatarImage(name: name, contentID: contentID)
             }
-            // Binds the lifecycle of the LoadableImage to the associated URL.
-            // This fixes the problem of the cache returning old values after a change in the URL.
-            .id(url)
         } else {
             PlaceholderAvatarImage(name: name, contentID: contentID)
         }

ElementX/Sources/Other/SwiftUI/Views/LoadableImage.swift

@@ -17,17 +17,14 @@
 import Kingfisher
 import SwiftUI
 
-struct LoadableImage<TransformerView: View, PlaceholderView: View>: View, ImageDataProvider {
+struct LoadableImage<TransformerView: View, PlaceholderView: View>: View {
     private let mediaSource: MediaSourceProxy
     private let blurhash: String?
     private let size: CGSize?
     private let imageProvider: ImageProviderProtocol?
-    
+    private let transformer: (AnyView) -> TransformerView
-    private var transformer: (AnyView) -> TransformerView
     private let placeholder: () -> PlaceholderView
     
-    @StateObject private var contentLoader: ContentLoader
-    
     /// A SwiftUI view that automatically fetches images
     /// It will try fetching the image from in-memory cache and if that's not available
     /// it will fire a task to load it through the image provider
@@ -46,11 +43,8 @@ struct LoadableImage<TransformerView: View, PlaceholderView: View>: View, ImageD
         self.blurhash = blurhash
         self.size = size
         self.imageProvider = imageProvider
-        
         self.transformer = transformer
         self.placeholder = placeholder
-        
-        _contentLoader = StateObject(wrappedValue: ContentLoader(mediaSource: mediaSource, size: size, imageProvider: imageProvider))
     }
     
     init(url: URL,
@@ -67,9 +61,46 @@ struct LoadableImage<TransformerView: View, PlaceholderView: View>: View, ImageD
                   placeholder: placeholder)
     }
     
+    var body: some View {
+        LoadableImageContent(mediaSource: mediaSource,
+                             blurhash: blurhash,
+                             size: size,
+                             imageProvider: imageProvider,
+                             transformer: transformer,
+                             placeholder: placeholder)
+            // Binds the lifecycle of the LoadableImage to the associated URL.
+            // This fixes the problem of the cache returning old values after a change in the URL.
+            .id(mediaSource.url)
+    }
+}
+
+private struct LoadableImageContent<TransformerView: View, PlaceholderView: View>: View, ImageDataProvider {
+    private let mediaSource: MediaSourceProxy
+    private let blurhash: String?
+    private let size: CGSize?
+    private let imageProvider: ImageProviderProtocol?
+    private let transformer: (AnyView) -> TransformerView
+    private let placeholder: () -> PlaceholderView
+    
+    @StateObject private var contentLoader: ContentLoader
+    
+    init(mediaSource: MediaSourceProxy,
+         blurhash: String? = nil,
+         size: CGSize? = nil,
+         imageProvider: ImageProviderProtocol?,
+         transformer: @escaping (AnyView) -> TransformerView,
+         placeholder: @escaping () -> PlaceholderView) {
+        self.mediaSource = mediaSource
+        self.blurhash = blurhash
+        self.size = size
+        self.imageProvider = imageProvider
+        self.transformer = transformer
+        self.placeholder = placeholder
+        _contentLoader = StateObject(wrappedValue: ContentLoader(mediaSource: mediaSource, size: size, imageProvider: imageProvider))
+    }
+    
     var body: some View {
         let _ = Task {
-            // Future improvement: Does guarding against a nil image prevent the image being updated when the URL changes?
             guard contentLoader.content == nil else {
                 return
             }