feat: Development commit

2 files changed, 121 insertions, 0 deletions

diff --git a/Sora/Views/Post/Details/Carousel/PostDetailsCarouselItemView.swift b/Sora/Views/Post/Details/Carousel/PostDetailsCarouselItemView.swift
new file mode 100644
index 0000000..c4aa292
--- /dev/null
+++ b/Sora/Views/Post/Details/Carousel/PostDetailsCarouselItemView.swift
@@ -0,0 +1,37 @@
+import SwiftUI
+
+struct PostDetailsCarouselItemView: View {
+  var post: BooruPost
+  var index: Int
+  @Binding var loadingStage: BooruPostLoadingState
+  var imageURL: (BooruPost) -> URL?
+  private var systemBackgroundColor: Color {
+    #if os(iOS)
+      return Color(.systemBackground)
+    #elseif os(macOS)
+      return Color(.windowBackgroundColor)
+    #else
+      return Color.gray
+    #endif
+  }
+
+  var body: some View {
+    ZStack {
+      PostDetailsImageView(
+        url: post.previewURL,
+        loadingStage: $loadingStage
+      )
+
+      PostDetailsImageView(
+        url: imageURL(post),
+        loadingStage: $loadingStage,
+        finalLoadingState: .loaded,
+        post: post
+      )
+      .background(
+        loadingStage == .loaded ? systemBackgroundColor : Color.clear
+      )
+    }
+    .tag(index)
+  }
+}
diff --git a/Sora/Views/Post/Details/Carousel/PostDetailsCarouselView.swift b/Sora/Views/Post/Details/Carousel/PostDetailsCarouselView.swift
new file mode 100644
index 0000000..61d3aef
--- /dev/null
+++ b/Sora/Views/Post/Details/Carousel/PostDetailsCarouselView.swift
@@ -0,0 +1,84 @@
+import SwiftUI
+
+struct PostDetailsCarouselView: View {
+  @EnvironmentObject var manager: BooruManager
+  @EnvironmentObject var settings: SettingsManager
+  let posts: [BooruPost]
+  let focusedPost: BooruPost?
+  @Binding var loadingStage: BooruPostLoadingState
+  @State private var currentIndex: Int
+  private let cacheManager = ImageCacheManager.shared
+
+  init(
+    posts: [BooruPost],
+    loadingStage: Binding<BooruPostLoadingState>,
+    focusedPost: BooruPost? = nil
+  ) {
+    self.posts = posts
+    self.focusedPost = focusedPost
+    _loadingStage = loadingStage
+
+    if let focused = focusedPost,
+      let index = posts.firstIndex(where: { $0.id == focused.id })
+    {
+      self._currentIndex = State(initialValue: index)
+    } else {
+      self._currentIndex = State(initialValue: 0)
+    }
+  }
+
+  func imageURL(post: BooruPost) -> URL? {
+    switch settings.detailViewQuality {
+    case .preview:
+      post.previewURL
+
+    case .sample:
+      post.sampleURL
+
+    case .original:
+      post.fileURL
+    }
+  }
+
+  var body: some View {
+    TabView(selection: $currentIndex) {
+      ForEach(Array(posts.enumerated()), id: \.offset) { index, post in
+        PostDetailsCarouselItemView(
+          post: post,
+          index: index,
+          loadingStage: $loadingStage,
+          imageURL: imageURL
+        )
+      }
+    }
+    .onChange(of: currentIndex) {
+      if currentIndex == posts.count - 1 { manager.loadNextPage() }
+
+      preloadNearbyImages()
+    }
+    .onAppear(perform: preloadNearbyImages)
+    #if !os(macOS)
+      .tabViewStyle(PageTabViewStyle(indexDisplayMode: .never))
+    #endif
+  }
+
+  private func preloadNearbyImages() {
+    let preloadRange = settings.preloadedCarouselImages
+
+    guard preloadRange > 0 else { return }
+
+    let startIndex = max(0, currentIndex - preloadRange)
+    let endIndex = min(posts.count - 1, currentIndex + preloadRange)
+    var urlsToPreload: [URL] = []
+
+    for index in startIndex...endIndex {
+      if let url = imageURL(post: posts[index]) {
+        urlsToPreload.append(url)
+      }
+
+      urlsToPreload.append(posts[index].previewURL)
+    }
+
+    cacheManager.preloadImages(urlsToPreload)
+  }
+}