Play back videos in focused attachment view

Packages/ComposeUI/Sources/ComposeUI/Controllers/FocusedAttachmentController.swift

@@ -7,17 +7,27 @@
 
 import SwiftUI
 import MatchedGeometryPresentation
+import AVKit
 
 class FocusedAttachmentController: ViewController {
     
     unowned let parent: ComposeController
     let attachment: DraftAttachment
     let thumbnailController: AttachmentThumbnailController
+    private let player: AVPlayer?
     
     init(parent: ComposeController, attachment: DraftAttachment, thumbnailController: AttachmentThumbnailController) {
         self.parent = parent
         self.attachment = attachment
         self.thumbnailController = thumbnailController
+        
+        if case let .file(url, type) = attachment.data,
+           type.conforms(to: .movie) {
+            self.player = AVPlayer(url: url)
+            self.player!.isMuted = true
+        } else {
+            self.player = nil
+        }
     }
     
     var view: some View {
@@ -35,16 +45,20 @@ class FocusedAttachmentController: ViewController {
             VStack(spacing: 0) {
                 Spacer(minLength: 0)
                 
-                let attachmentView =
-                    ControllerView(controller: { controller.thumbnailController })
-                        .environment(\.attachmentThumbnailConfiguration, .init(contentMode: .fit, fullSize: true))
+                if let player = controller.player {
+                    VideoPlayer(player: player)
                         .matchedGeometryDestination(id: attachment.id)
-                if #available(iOS 16.0, *) {
+                        .onAppear {
+                            player.play()
+                        }
+                } else if #available(iOS 16.0, *) {
                     ZoomableScrollView {
                         attachmentView
+                            .matchedGeometryDestination(id: attachment.id)
                     }
                 } else {
                     attachmentView
+                        .matchedGeometryDestination(id: attachment.id)
                 }
                 
                 Spacer(minLength: 0)
@@ -71,6 +85,11 @@ class FocusedAttachmentController: ViewController {
                 .padding([.top, .leading], 4)
             })
         }
+        
+        private var attachmentView: some View {
+            ControllerView(controller: { controller.thumbnailController })
+                .environment(\.attachmentThumbnailConfiguration, .init(contentMode: .fit, fullSize: true))
+        }
     }
 }