Merge pull request #2994 from matrix-org/travis/screenreader/topleftmenu

Update TopLeftMenu for accessibility: Keyboard shortcut, reduced screen reader noise

src/utils/Accessibility.js

@@ -0,0 +1,28 @@
+/*
+Copyright 2019 The Matrix.org Foundation C.I.C.
+
+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.
+*/
+
+/**
+ * Automatically focuses the captured reference when receiving a non-null
+ * object. Useful in scenarios where componentDidMount does not have a
+ * useful reference to an element, but one needs to focus the element on
+ * first render. Example usage: ref={focusCapturedRef}
+ * @param {function} ref The React reference to focus on, if not null
+ */
+export function focusCapturedRef(ref) {
+    if (ref) {
+        ref.focus();
+    }
+}