Rename ErrorAlertInfo to AlertInfo.

RiotSwiftUI/Modules/Common/ErrorHandling/AlertInfo.swift

@@ -0,0 +1,71 @@
+// 
+// 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
+
+/// A type that describes an alert to be shown to the user.
+///
+/// The alert info can be added to the view state and used as an alert's `item`:
+/// ```
+/// MyView
+///     .alert(item: $viewModel.alertInfo) { $0.alert }
+/// ```
+struct AlertInfo<T: Hashable>: Identifiable {
+    /// An identifier that can be used to distinguish one error from another.
+    let id: T
+    /// The alert's title.
+    let title: String
+    /// The alert's message (optional).
+    var message: String? = nil
+    /// The alert's primary button title and action. Defaults to an Ok button with no action.
+    var primaryButton: (title: String, action: (() -> Void)?) = (VectorL10n.ok, nil)
+    /// The alert's secondary button title and action.
+    var secondaryButton: (title: String, action: (() -> Void)?)? = nil
+}
+
+extension AlertInfo where T == Int {
+    /// Initialises the type with the title and message from an `NSError` along with the default Ok button.
+    init?(error: NSError? = nil) {
+        guard error?.domain != NSURLErrorDomain && error?.code != NSURLErrorCancelled else { return nil }
+        
+        id = error?.code ?? -1
+        title = error?.userInfo[NSLocalizedFailureReasonErrorKey] as? String ?? VectorL10n.error
+        message = error?.userInfo[NSLocalizedDescriptionKey] as? String ?? VectorL10n.errorCommonMessage
+    }
+}
+
+@available(iOS 13.0, *)
+extension AlertInfo {
+    private var messageText: Text? {
+        guard let message = message else { return nil }
+        return Text(message)
+    }
+    
+    /// Returns a SwiftUI `Alert` created from this alert info, using default button
+    /// styles for both primary and (if set) secondary buttons.
+    var alert: Alert {
+        if let secondaryButton = secondaryButton {
+            return Alert(title: Text(title),
+                         message: messageText,
+                         primaryButton: .default(Text(primaryButton.title), action: primaryButton.action),
+                         secondaryButton: .default(Text(secondaryButton.title), action: secondaryButton.action))
+        } else {
+            return Alert(title: Text(title),
+                         message: messageText,
+                         dismissButton: .default(Text(primaryButton.title), action: primaryButton.action))
+        }
+    }
+}