Add chat example

RiotSwiftUI/Modules/Template/TemplateAdvancedRoomsExample/TemplateRoomChat/Service/Mock/MockTemplateRoomChatScreenState.swift

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+// 
+// Copyright 2021 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+import SwiftUI
+
+
+/// Using an enum for the screen allows you define the different state cases with
+/// the relevant associated data for each case.
+@available(iOS 14.0, *)
+enum MockTemplateRoomChatScreenState: MockScreenState, CaseIterable {
+    // A case for each state you want to represent
+    // with specific, minimal associated data that will allow you
+    // mock that screen.
+    case noRooms
+    case rooms
+    
+    /// The associated screen
+    var screenType: Any.Type {
+        TemplateRoomChat.self
+    }
+    
+    /// Generate the view struct for the screen state.
+    var screenView: AnyView {
+        let service: MockTemplateRoomChatService
+        switch self {
+        case .noRooms:
+            service = MockTemplateRoomChatService(messages: [])
+        case .rooms:
+            service = MockTemplateRoomChatService()
+        }
+        let viewModel = TemplateRoomChatViewModel(templateRoomChatService: service)
+        
+        // can simulate service and viewModel actions here if needs be.
+        
+        return AnyView(TemplateRoomChat(viewModel: viewModel)
+                .addDependency(MockAvatarService.example))
+    }
+}

RiotSwiftUI/Modules/Template/TemplateAdvancedRoomsExample/TemplateRoomChat/Service/Mock/MockTemplateRoomChatService.swift

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+// 
+// Copyright 2021 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+import Combine
+
+@available(iOS 14.0, *)
+class MockTemplateRoomChatService: TemplateRoomChatServiceProtocol {
+    
+    static let mockMessages = [
+        TemplateRoomChatMessage(id: "!aaabaa:matrix.org", body: "Shall I put it live?", sender: "@alice:matrix.org"),
+        TemplateRoomChatMessage(id: "!bbbabb:matrix.org", body: "Yea go for it! ...and then let's head to the pub", sender: "@patrice:matrix.org"),
+        TemplateRoomChatMessage(id: "!aaabaa:matrix.org", body: "Deal.", sender: "@alice:matrix.org"),
+        TemplateRoomChatMessage(id: "!aaabaa:matrix.org", body: "Ok, Done. 🍻", sender: "@alice:matrix.org"),
+    ]
+    var chatMessagesSubject: CurrentValueSubject<[TemplateRoomChatMessage], Never>
+
+    init(messages: [TemplateRoomChatMessage] = mockMessages) {
+        chatMessagesSubject = CurrentValueSubject(messages)
+    }
+    
+    func simulateUpdate(messages: [TemplateRoomChatMessage]) {
+        self.chatMessagesSubject.send(messages)
+    }
+}