Setup the threaded timeline media preview action

ElementX/Sources/Screens/ThreadTimelineScreen/ThreadTimelineScreenCoordinator.swift

@@ -81,7 +81,7 @@ final class ThreadTimelineScreenCoordinator: CoordinatorProtocol {
                 case .displayDocumentPicker:
                     actionsSubject.send(.presentMediaUploadPicker(.documents))
                 case .displayMediaPreview(let mediaPreviewViewModel):
-                    break
+                    viewModel.displayMediaPreview(mediaPreviewViewModel)
                 case .displayLocationPicker:
                     actionsSubject.send(.presentLocationPicker)
                 case .displayPollForm(let mode):
@@ -96,11 +96,7 @@ final class ThreadTimelineScreenCoordinator: CoordinatorProtocol {
                     actionsSubject.send(.presentLocationViewer(body: body, geoURI: geoURI, description: description))
                 case .displayResolveSendFailure(let failure, let sendHandle):
                     actionsSubject.send(.presentResolveSendFailure(failure: failure, sendHandle: sendHandle))
-                case .displayThread(let itemID):
-                    break
-                case .composer(let action):
-                    break
-                case .hasScrolled(direction: let direction):
+                case .displayThread, .composer, .hasScrolled:
                     break
                 case .viewInRoomTimeline:
                     fatalError("The action: \(action) should not be sent to this coordinator")

ElementX/Sources/Screens/ThreadTimelineScreen/ThreadTimelineScreenViewModel.swift

@@ -28,4 +28,18 @@ class ThreadTimelineScreenViewModel: ThreadTimelineScreenViewModelType, ThreadTi
         // Work around QLPreviewController dismissal issues, see the InteractiveQuickLookModifier.
         state.bindings.mediaPreviewViewModel = nil
     }
+    
+    func displayMediaPreview(_ mediaPreviewViewModel: TimelineMediaPreviewViewModel) {
+        mediaPreviewViewModel.actions.sink { [weak self] action in
+            switch action {
+            case .viewInRoomTimeline:
+                fatalError("viewInRoomTimeline should not be visible on a thread preview.")
+            case .dismiss:
+                self?.state.bindings.mediaPreviewViewModel = nil
+            }
+        }
+        .store(in: &cancellables)
+        
+        state.bindings.mediaPreviewViewModel = mediaPreviewViewModel
+    }
 }

ElementX/Sources/Screens/ThreadTimelineScreen/ThreadTimelineScreenViewModelProtocol.swift

@@ -13,4 +13,6 @@ protocol ThreadTimelineScreenViewModelProtocol {
     var context: ThreadTimelineScreenViewModelType.Context { get }
     
     func stop()
+    
+    func displayMediaPreview(_ mediaPreviewViewModel: TimelineMediaPreviewViewModel)
 }