osx: implements quicklook

osx/kordophone2/Transcript/TranscriptDisplayItemViews.swift

@@ -90,7 +90,8 @@ struct ImageItemView: View
     @Environment(\.xpcClient) var xpcClient
     
     @State private var containerWidth: CGFloat? = nil
-    
+    @State private var isDownloadingFullAttachment: Bool = false
+
     private var aspectRatio: CGFloat {
         attachment.size?.aspectRatio ?? 1.0
     }
@@ -102,17 +103,36 @@ struct ImageItemView: View
     var body: some View {
         BubbleView(sender: sender, date: date) {
             let maxWidth = CGFloat.minimum(.imageMaxWidth, containerWidth ?? .imageMaxWidth)
-            if let img {
-                Image(nsImage: img)
-                    .resizable()
-                    .scaledToFit()
-                    .frame(maxWidth: maxWidth)
-            } else {
-                Rectangle()
-                    .fill(.gray.opacity(0.4))
-                    .frame(width: preferredWidth, height: preferredWidth / aspectRatio)
-                    .frame(maxWidth: maxWidth)
+
+            Group {
+                if let img {
+                    Image(nsImage: img)
+                        .resizable()
+                        .scaledToFit()
+                        .frame(maxWidth: maxWidth)
+                } else {
+                    Rectangle()
+                        .fill(.gray.opacity(0.4))
+                        .frame(width: preferredWidth, height: preferredWidth / aspectRatio)
+                        .frame(maxWidth: maxWidth)
+                }
             }
+
+            // Download indicator
+            .overlay {
+                if isDownloadingFullAttachment {
+                    ZStack {
+                        Rectangle()
+                            .fill(.black.opacity(0.2))
+
+                        ProgressView()
+                            .progressViewStyle(.circular)
+                    }
+                }
+            }
+        }
+        .onTapGesture(count: 2) {
+            openAttachment()
         }
         .onGeometryChange(for: CGFloat.self,
                           of: { $0.size.width },
@@ -136,6 +156,24 @@ struct ImageItemView: View
             }
         }
     }
+
+    private func openAttachment() {
+        Task {
+            var path = attachment.fullsizePath
+            if !attachment.isFullsizeDownloaded {
+                isDownloadingFullAttachment = true
+                try await xpcClient.downloadAttachment(attachmentId: attachment.id, preview: false, awaitCompletion: true)
+
+                // Need to re-fetch this -- the extension may have changed.
+                let info = try await xpcClient.getAttachmentInfo(attachmentId: attachment.id)
+                path = info.path
+
+                isDownloadingFullAttachment = false
+            }
+
+            PreviewPanel.shared.show(url: URL(filePath: path))
+        }
+    }
 }
 
 struct PlaceholderImageItemView: View