Fixes #1140 - Dismiss all modals when presenting a room

ElementX/Sources/FlowCoordinators/RoomFlowCoordinator.swift

@@ -259,6 +259,10 @@ class RoomFlowCoordinator: FlowCoordinatorProtocol {
     }
     
     private func asyncPresentRoom(_ roomID: String, animated: Bool, destinationRoomProxy: RoomProxyProtocol? = nil) async {
+        // If any sheets are presented dismiss them, rely on their dismissal callbacks to transition the state machine
+        // through the correct states before presenting the room
+        navigationStackCoordinator.setSheetCoordinator(nil)
+        
         if let roomProxy, roomProxy.id == roomID {
             navigationStackCoordinator.popToRoot()
             return

ElementX/Sources/Screens/FilePreviewScreen/InteractiveQuickLook.swift

@@ -14,6 +14,7 @@
 // limitations under the License.
 //
 
+import Combine
 import QuickLook
 import SwiftUI
 
@@ -28,10 +29,15 @@ extension View {
 private struct InteractiveQuickLookModifier: ViewModifier {
     @Binding var item: MediaPreviewItem?
     
+    @State private var dismissalPublisher = PassthroughSubject<Void, Never>()
+    
     func body(content: Content) -> some View {
         content.background {
             if let item {
-                MediaPreviewViewController(previewItem: item) { self.item = nil }
+                MediaPreviewViewController(previewItem: item, dismissalPublisher: dismissalPublisher) { self.item = nil }
+            } else {
+                // Work around QLPreviewController dismissal issues, see below.
+                let _ = dismissalPublisher.send(())
             }
         }
     }
@@ -39,10 +45,11 @@ private struct InteractiveQuickLookModifier: ViewModifier {
 
 private struct MediaPreviewViewController: UIViewControllerRepresentable {
     let previewItem: MediaPreviewItem
+    let dismissalPublisher: PassthroughSubject<Void, Never>
     let onDismiss: () -> Void
 
     func makeUIViewController(context: Context) -> PreviewHostingController {
-        PreviewHostingController(previewItem: previewItem, onDismiss: onDismiss)
+        PreviewHostingController(previewItem: previewItem, dismissalPublisher: dismissalPublisher, onDismiss: onDismiss)
     }
 
     func updateUIViewController(_ uiViewController: PreviewHostingController, context: Context) { }
@@ -53,15 +60,26 @@ private struct MediaPreviewViewController: UIViewControllerRepresentable {
     /// animations and interactions which don't work if you represent it directly to SwiftUI 🤷‍♂️
     class PreviewHostingController: UIViewController, QLPreviewControllerDataSource, QLPreviewControllerDelegate {
         let previewItem: MediaPreviewItem
+        let dismissalPublisher: PassthroughSubject<Void, Never>
         let onDismiss: () -> Void
         
+        private var dismissalObserver: AnyCancellable?
+        
         var previewController: QLPreviewController?
 
-        init(previewItem: MediaPreviewItem, onDismiss: @escaping () -> Void) {
+        init(previewItem: MediaPreviewItem, dismissalPublisher: PassthroughSubject<Void, Never>, onDismiss: @escaping () -> Void) {
             self.previewItem = previewItem
+            self.dismissalPublisher = dismissalPublisher
             self.onDismiss = onDismiss
-            
+
             super.init(nibName: nil, bundle: nil)
+            
+            // The QLPreviewController will not automatically dismiss itself when the underlying view is removed
+            // (e.g. switching rooms from a notification) and it continues to hold on to the whole hierarcy.
+            // Manually tell it to dismiss itself here.
+            dismissalObserver = dismissalPublisher.sink { _ in
+                self.dismiss(animated: true)
+            }
         }
         
         @available(*, unavailable)
@@ -125,6 +143,6 @@ struct PreviewView_Previews: PreviewProvider {
                                               title: "Important Document")
     
     static var previews: some View {
-        MediaPreviewViewController(previewItem: previewItem) { }
+        MediaPreviewViewController(previewItem: previewItem, dismissalPublisher: .init()) { }
     }
 }

ElementX/Sources/Screens/RoomDetailsScreen/RoomDetailsScreenCoordinator.swift

@@ -79,6 +79,10 @@ final class RoomDetailsScreenCoordinator: CoordinatorProtocol {
         }
     }
     
+    func stop() {
+        viewModel.stop()
+    }
+    
     func toPresentable() -> AnyView {
         AnyView(RoomDetailsScreen(context: viewModel.context))
     }

ElementX/Sources/Screens/RoomDetailsScreen/RoomDetailsScreenViewModel.swift

@@ -69,6 +69,11 @@ class RoomDetailsScreenViewModel: RoomDetailsScreenViewModelType, RoomDetailsScr
     
     // MARK: - Public
     
+    func stop() {
+        // Work around QLPreviewController dismissal issues, see the InteractiveQuickLookModifier.
+        state.bindings.mediaPreviewItem = nil
+    }
+    
     override func process(viewAction: RoomDetailsScreenViewAction) {
         switch viewAction {
         case .processTapPeople:

ElementX/Sources/Screens/RoomDetailsScreen/RoomDetailsScreenViewModelProtocol.swift

@@ -20,4 +20,5 @@ import Foundation
 protocol RoomDetailsScreenViewModelProtocol {
     var callback: ((RoomDetailsScreenViewModelAction) -> Void)? { get set }
     var context: RoomDetailsScreenViewModelType.Context { get }
+    func stop()
 }

ElementX/Sources/Screens/RoomMemberDetailsScreen/RoomMemberDetailsScreenCoordinator.swift

@@ -41,6 +41,8 @@ final class RoomMemberDetailsScreenCoordinator: CoordinatorProtocol {
     }
 
     func start() { }
+    
+    func stop() { viewModel.stop() }
 
     func toPresentable() -> AnyView {
         AnyView(RoomMemberDetailsScreen(context: viewModel.context))

ElementX/Sources/Screens/RoomMemberDetailsScreen/RoomMemberDetailsScreenViewModel.swift

@@ -43,6 +43,11 @@ class RoomMemberDetailsScreenViewModel: RoomMemberDetailsScreenViewModelType, Ro
     
     // MARK: - Public
     
+    func stop() {
+        // Work around QLPreviewController dismissal issues, see the InteractiveQuickLookModifier.
+        state.bindings.mediaPreviewItem = nil
+    }
+    
     override func process(viewAction: RoomMemberDetailsScreenViewAction) {
         switch viewAction {
         case .showUnignoreAlert:

ElementX/Sources/Screens/RoomMemberDetailsScreen/RoomMemberDetailsScreenViewModelProtocol.swift

@@ -20,4 +20,5 @@ import Foundation
 protocol RoomMemberDetailsScreenViewModelProtocol {
     var callback: ((RoomMemberDetailsScreenViewModelAction) -> Void)? { get set }
     var context: RoomMemberDetailsScreenViewModelType.Context { get }
+    func stop()
 }

ElementX/Sources/Screens/RoomScreen/RoomScreenCoordinator.swift

@@ -106,6 +106,10 @@ final class RoomScreenCoordinator: CoordinatorProtocol {
             .store(in: &cancellables)
     }
     
+    func stop() {
+        viewModel.stop()
+    }
+    
     func toPresentable() -> AnyView {
         AnyView(RoomScreen(context: viewModel.context, composerToolbar: ComposerToolbar(context: composerViewModel.context)))
     }

ElementX/Sources/Screens/RoomScreen/RoomScreenViewModel.swift

@@ -89,6 +89,11 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
         actionsSubject.eraseToAnyPublisher()
     }
     
+    func stop() {
+        // Work around QLPreviewController dismissal issues, see the InteractiveQuickLookModifier.
+        state.bindings.mediaPreviewItem = nil
+    }
+    
     override func process(viewAction: RoomScreenViewAction) {
         switch viewAction {
         case .displayRoomDetails:

ElementX/Sources/Screens/RoomScreen/RoomScreenViewModelProtocol.swift

@@ -23,4 +23,5 @@ protocol RoomScreenViewModelProtocol {
     var actions: AnyPublisher<RoomScreenViewModelAction, Never> { get }
     var context: RoomScreenViewModelType.Context { get }
     func process(composerAction: ComposerToolbarViewModelAction)
+    func stop()
 }

changelog.d/1140.bugfix

@@ -0,0 +1 @@
+Prevent inconsistent view hierarchies when opening rooms from push notifications