Implement new in-call header and footer designs

src/useMediaQuery.ts

@@ -0,0 +1,37 @@
+/*
+Copyright 2023 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 { useCallback, useMemo, useState } from "react";
+
+import { useEventTarget } from "./useEvents";
+
+/**
+ * React hook that tracks whether the given media query matches.
+ */
+export const useMediaQuery = (query: string) => {
+  const mediaQuery = useMemo(() => matchMedia(query), [query]);
+
+  const [numChanges, setNumChanges] = useState(0);
+  useEventTarget(
+    mediaQuery,
+    "change",
+    useCallback(() => setNumChanges((n) => n + 1), [setNumChanges])
+  );
+
+  // We want any change to the update counter to trigger an update here
+  // eslint-disable-next-line react-hooks/exhaustive-deps
+  return useMemo(() => mediaQuery.matches, [mediaQuery, numChanges]);
+};