Room user indicators

Signed-off-by: Andy Uhnak <andyuhnak@gmail.com>

Riot/Modules/Common/ActivityIndicator/UserIndicatorPresenterWrapper.swift

@@ -0,0 +1,54 @@
+// 
+// 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 CommonKit
+
+/// A convenience objc-compatible wrapper around `UserIndicatorTypePresenterProtocol`.
+///
+/// This class wraps swift-only protocol by exponsing multiple methods instead of accepting struct types
+/// and it keeps a track of `UserIndicator`s instead of returning them to the caller.
+@objc final class UserIndicatorPresenterWrapper: NSObject {
+    private let presenter: UserIndicatorTypePresenterProtocol
+    private var loadingIndicator: UserIndicator?
+    private var otherIndicators = [UserIndicator]()
+    
+    init(presenter: UserIndicatorTypePresenterProtocol) {
+        self.presenter = presenter
+    }
+    
+    @objc func presentActivityIndicator() {
+        presentActivityIndicator(label: VectorL10n.homeSyncing)
+    }
+
+    @objc func presentActivityIndicator(label: String) {
+        guard loadingIndicator == nil else {
+            // The app is very liberal with calling `presentActivityIndicator` (often not matched by corresponding `removeCurrentActivityIndicator`),
+            // so there is no reason to keep adding new indiciators if there is one already showing.
+            return
+        }
+
+        loadingIndicator = presenter.present(.loading(label: label, isInteractionBlocking: false))
+    }
+    
+    @objc func dismissActivityIndicator() {
+        loadingIndicator = nil
+    }
+    
+    @objc func presentSuccess(label: String) {
+        presenter.present(.success(label: label)).store(in: &otherIndicators)
+    }
+}