Add animation and wait for callback to confirm download

swift/ChatRoomTutorial/ChatRoomTutorial/ChatRoomExample.swift

@@ -44,7 +44,7 @@ class ChatRoomExampleContext : ObservableObject
     @Published var chatroomState = ChatroomExampleState.Unstarted
 	@Published var textToSend: String = "msg to send"
     @Published var sReceivedMessages : String = ""
-	
+	@Published var isDownloading : Bool = false
 	var fileFolderUrl : URL?
 	var fileUrl : URL?
     
@@ -52,7 +52,8 @@ class ChatRoomExampleContext : ObservableObject
     {
         mChatRoomDelegate.tutorialContext = self
 		mLinphoneCoreDelegate.tutorialContext = self
-        
+		mChatMessageDelegate.tutorialContext = self
+		
         // Initialize Linphone Core
         try? mCore = Factory.Instance.createCore(configPath: "", factoryConfigPath: "", systemContext: nil)
 
@@ -177,7 +178,6 @@ class ChatRoomExampleContext : ObservableObject
 			content.subtype = "plain"
 			
 			mChatMessage = try mChatRoom!.createFileTransferMessage(initialContent: content)
-			mChatMessage!.addDelegate(delegate: self.mChatMessageDelegate)
 			mChatMessage!.send()
 		}catch let error as NSError {
 			print("Unable to create directory",error)
@@ -192,6 +192,7 @@ class ChatRoomExampleContext : ObservableObject
 					if (!contentName.isEmpty) {
 						content.filePath = fileFolderUrl!.appendingPathComponent(contentName).path
 						print("Start downloading \(content.name) into \(content.filePath)")
+						isDownloading = true
 						if (!message.downloadContent(content: content)) {
 							print ("Download of \(contentName) failed")
 						}
@@ -236,7 +237,6 @@ class LinphoneCoreDelegate: CoreDelegate {
 }
 
 class LinphoneChatRoomStateTracker: ChatRoomDelegate {
-       
     var tutorialContext : ChatRoomExampleContext!
 	
 	func onConferenceJoined(chatRoom: ChatRoom, eventLog: EventLog) {
@@ -246,11 +246,12 @@ class LinphoneChatRoomStateTracker: ChatRoomDelegate {
 }
 
 class LinphoneChatMessageTracker: ChatMessageDelegate {
+	var tutorialContext : ChatRoomExampleContext!
+	
 	func onMsgStateChanged(message msg: ChatMessage, state: ChatMessage.State) {
         print("MessageTrace - msg state changed: \(state)\n")
+		if (state == ChatMessage.State.FileTransferDone && tutorialContext.isDownloading == true) {
+			tutorialContext.isDownloading = false
+		}
     }
-	
-	func onFileTransferRecv(message: ChatMessage, content: Content, buffer: Buffer) {
-		
-	}
 }

swift/ChatRoomTutorial/ChatRoomTutorial/ContentView.swift

@@ -18,6 +18,18 @@ func getStateAsString(chatroomState : ChatroomExampleState) -> String
 	}
 }
 
+struct ActivityIndicator: UIViewRepresentable {
+	func makeUIView(context: UIViewRepresentableContext<ActivityIndicator>) -> UIActivityIndicatorView
+	{
+		return UIActivityIndicatorView(style: .medium)
+	}
+	
+	func updateUIView(_ uiView: UIActivityIndicatorView, context: UIViewRepresentableContext<ActivityIndicator>)
+	{
+		uiView.startAnimating()
+	}
+}
+
 struct ContentView: View {
     
 	@ObservedObject var tutorialContext : ChatRoomExampleContext
@@ -80,6 +92,9 @@ struct ContentView: View {
 						Text(getStateAsString(chatroomState: tutorialContext.chatroomState))
 							.font(.footnote)
 							.foregroundColor((tutorialContext.chatroomState == ChatroomExampleState.Started) ? Color.green : Color	.black)
+						if (tutorialContext.chatroomState == ChatroomExampleState.Starting) {
+							ActivityIndicator()
+						}
 					}
 				}
 				Button(action: {
@@ -127,7 +142,6 @@ struct ContentView: View {
 							.frame(width: 120.0, height: 50.0)
 							.background(Color.gray)
 						}.disabled(tutorialContext.chatroomState != ChatroomExampleState.Started)
-						
 						Button(action: tutorialContext.downloadLastFileMessage)
 						{
 							Text("Download last files \n received")
@@ -136,6 +150,9 @@ struct ContentView: View {
 							.frame(width: 150.0, height: 50.0)
 							.background(Color.gray)
 						}.disabled(tutorialContext.mLastFileMessageReceived == nil)
+						if (tutorialContext.isDownloading) {
+							ActivityIndicator()
+						}
 					}
 				}
 				Spacer()