Add Event Routes to the flows (#2743)

ElementX/Sources/Screens/RoomScreen/RoomScreenCoordinator.swift

@@ -21,6 +21,7 @@ import WysiwygComposer
 
 struct RoomScreenCoordinatorParameters {
     let roomProxy: RoomProxyProtocol
+    var focussedEventID: String?
     let timelineController: RoomTimelineControllerProtocol
     let mediaProvider: MediaProviderProtocol
     let mediaPlayerProvider: MediaPlayerProviderProtocol
@@ -59,6 +60,7 @@ final class RoomScreenCoordinator: CoordinatorProtocol {
     
     init(parameters: RoomScreenCoordinatorParameters) {
         viewModel = RoomScreenViewModel(roomProxy: parameters.roomProxy,
+                                        focussedEventID: parameters.focussedEventID,
                                         timelineController: parameters.timelineController,
                                         mediaProvider: parameters.mediaProvider,
                                         mediaPlayerProvider: parameters.mediaPlayerProvider,
@@ -129,6 +131,10 @@ final class RoomScreenCoordinator: CoordinatorProtocol {
             .store(in: &cancellables)
     }
     
+    func focusOnEvent(eventID: String) {
+        Task { await viewModel.focusOnEvent(eventID: eventID) }
+    }
+    
     func stop() {
         viewModel.stop()
     }

ElementX/Sources/Screens/RoomScreen/RoomScreenViewModel.swift

@@ -49,6 +49,7 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
     private var paginateBackwardsTask: Task<Void, Never>?
 
     init(roomProxy: RoomProxyProtocol,
+         focussedEventID: String? = nil,
          timelineController: RoomTimelineControllerProtocol,
          mediaProvider: MediaProviderProtocol,
          mediaPlayerProvider: MediaPlayerProviderProtocol,
@@ -90,6 +91,11 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
                                                          bindings: .init(reactionsCollapsed: [:])),
                    imageProvider: mediaProvider)
         
+        // This may change to load the detached timeline directly.
+        if let focussedEventID {
+            Task { await focusOnEvent(eventID: focussedEventID) }
+        }
+        
         setupSubscriptions()
         setupDirectRoomSubscriptionsIfNeeded()
         
@@ -208,6 +214,8 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
         }
     }
     
+    func focusOnEvent(eventID: String) async { }
+    
     // MARK: - Private
     
     private func attach(_ attachment: ComposerAttachmentType) {

ElementX/Sources/Screens/RoomScreen/RoomScreenViewModelProtocol.swift

@@ -23,5 +23,7 @@ protocol RoomScreenViewModelProtocol {
     var actions: AnyPublisher<RoomScreenViewModelAction, Never> { get }
     var context: RoomScreenViewModelType.Context { get }
     func process(composerAction: ComposerToolbarViewModelAction)
+    /// Updates the timeline to show and highlight the item with the corresponding event ID.
+    func focusOnEvent(eventID: String) async
     func stop()
 }