Create change password screen

RiotSwiftUI/Modules/Settings/ChangePassword/ChangePasswordModels.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 SwiftUI
+
+// MARK: View model
+
+enum ChangePasswordViewModelResult {
+    /// Submit with old and new passwords and sign out of all devices option
+    case submit(String, String, Bool)
+}
+
+// MARK: View
+
+struct ChangePasswordViewState: BindableState {
+    /// View state that can be bound to from SwiftUI.
+    var bindings: ChangePasswordBindings
+    
+    /// Whether the user can submit the form: old password should be entered, and new passwords should match
+    var canSubmit: Bool {
+        !bindings.oldPassword.isEmpty
+        && !bindings.newPassword1.isEmpty
+        && bindings.newPassword1 == bindings.newPassword2
+    }
+}
+
+struct ChangePasswordBindings {
+    /// The password input by the user.
+    var oldPassword: String
+    /// The new password input by the user.
+    var newPassword1: String
+    /// The new password confirmation input by the user.
+    var newPassword2: String
+    /// The signout all devices checkbox status
+    var signoutAllDevices: Bool
+    /// Information describing the currently displayed alert.
+    var alertInfo: AlertInfo<ChangePasswordErrorType>?
+}
+
+enum ChangePasswordViewAction {
+    /// Send an email to the entered address.
+    case submit
+    /// Toggle sign out of all devices
+    case toggleSignoutAllDevices
+}
+
+enum ChangePasswordErrorType: Hashable {
+    /// An error response from the homeserver.
+    case mxError(String)
+    /// An unknown error occurred.
+    case unknown
+}