Add support for Apple context menus in matrix items list screens (#5963)

Riot/Modules/ContextMenu/ViewModels/RoomContextPreviewViewModels.swift

@@ -0,0 +1,52 @@
+// 
+// Copyright 2022 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
+
+/// All the data potentially loaded by the `RoomContextPreviewViewModelProtocol` to the `RoomContextPreviewViewController`
+struct RoomContextPreviewLoadedParameters {
+    let roomId: String
+    let roomType: MXRoomType
+    let displayName: String?
+    let topic: String?
+    let avatarUrl: String?
+    let joinRule: MXRoomJoinRule?
+    let membership: MXMembership
+    let inviterId: String?
+    let inviter: MXUser?
+    let membersCount: Int
+}
+
+/// `RoomContextPreviewViewController` view state
+enum RoomContextPreviewViewState {
+    case loaded(_ paremeters: RoomContextPreviewLoadedParameters)
+}
+
+/// `RoomContextPreviewViewController` view action
+enum RoomContextPreviewViewAction {
+    case loadData
+}
+
+/// View delegate for `RoomContextPreviewViewModelProtocol`
+protocol RoomContextPreviewViewModelViewDelegate: AnyObject {
+    func roomContextPreviewViewModel(_ viewModel: RoomContextPreviewViewModelProtocol, didUpdateViewState viewSate: RoomContextPreviewViewState)
+}
+
+/// Classes compliant with `RoomContextPreviewViewModelProtocol` are meant to provide the data to the `RoomContextPreviewViewController`
+protocol RoomContextPreviewViewModelProtocol {
+    var viewDelegate: RoomContextPreviewViewModelViewDelegate? { get set }
+    func process(viewAction: RoomContextPreviewViewAction)
+}