Implement home screen activity indicators

Riot/Modules/Application/AppCoordinator.swift

@@ -17,9 +17,11 @@
 import Foundation
 import Intents
 import MatrixSDK
+import CommonKit
 
 #if DEBUG
 import FLEX
+import UIKit
 #endif
 
 /// The AppCoordinator is responsible of screen navigation and data injection at root application level. It decides
@@ -47,7 +49,7 @@ final class AppCoordinator: NSObject, AppCoordinatorType {
         return AppNavigator(appCoordinator: self)
     }()
     
-    private weak var splitViewCoordinator: SplitViewCoordinatorType?
+    fileprivate weak var splitViewCoordinator: SplitViewCoordinatorType?
     fileprivate weak var sideMenuCoordinator: SideMenuCoordinatorType?
     
     private let userSessionsService: UserSessionsService
@@ -296,6 +298,18 @@ fileprivate class AppNavigator: AppNavigatorProtocol {
         return SideMenuPresenter(sideMenuCoordinator: sideMenuCoordinator)
     }()
     
+    private var appNavigationVC: UINavigationController {
+        guard
+            let splitVC = appCoordinator.splitViewCoordinator?.toPresentable() as? UISplitViewController,
+            // Picking out the first view controller currently works only on iPhones, not iPads
+            let navigationVC = splitVC.viewControllers.first as? UINavigationController
+        else {
+            MXLog.error("[AppNavigator] Missing root split view controller")
+            return UINavigationController()
+        }
+        return navigationVC
+    }
+    
     // MARK: - Setup
     
     init(appCoordinator: AppCoordinator) {
@@ -307,4 +321,16 @@ fileprivate class AppNavigator: AppNavigatorProtocol {
     func navigate(to destination: AppNavigatorDestination) {
         self.appCoordinator.navigate(to: destination)
     }
+    
+    func addLoadingActivity() -> Activity {
+        let presenter = ActivityIndicatorToastPresenter(
+            text: VectorL10n.roomParticipantsSecurityLoading,
+            navigationController: appNavigationVC
+        )
+        let request = ActivityRequest(
+            presenter: presenter,
+            dismissal: .manual
+        )
+        return ActivityCenter.shared.add(request)
+    }
 }

Riot/Modules/Application/AppNavigator.swift

@@ -15,6 +15,7 @@
 //
 
 import Foundation
+import CommonKit
 
 /// AppNavigatorProtocol abstract a navigator at app level.
 /// It enables to perform the navigation within the global app scope (open the side menu, open a room and so on)
@@ -26,4 +27,12 @@ protocol AppNavigatorProtocol {
     /// Navigate to a destination screen or a state
     /// Do not use protocol with associatedtype for the moment like presented here https://www.swiftbysundell.com/articles/navigation-in-swift/#where-to-navigator use a separate enum
     func navigate(to destination: AppNavigatorDestination)
+    
+    /// Add loading activity to an app-wide queue of other activitie
+    ///
+    /// If the queue is empty, the activity will be displayed immediately, otherwise it will be pending
+    /// until the previously added activities have completed / been cancelled.
+    ///
+    /// To remove an activity indicator, cancel or deallocate the returned `Activity`
+    func addLoadingActivity() -> Activity
 }