Add a 'waiting for network' state to walkie-talkie mode

src/useDelayedState.ts

@@ -0,0 +1,44 @@
+/*
+Copyright 2022 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 { useState, useRef, useEffect } from "react";
+
+export const useDelayedState = <T>(
+  initial?: T
+): [T, (value: T, delay: number) => void, (value: T) => void] => {
+  const [state, setState] = useState<T>(initial);
+  const timers = useRef<Set<ReturnType<typeof setTimeout>>>();
+  if (!timers.current) timers.current = new Set();
+
+  const setStateDelayed = (value: T, delay: number) => {
+    const timer = setTimeout(() => {
+      setState(value);
+      timers.current.delete(timer);
+    }, delay);
+    timers.current.add(timer);
+  };
+  const setStateImmediate = (value: T) => {
+    // Clear all updates currently in the queue
+    for (const timer of timers.current) clearTimeout(timer);
+    timers.current.clear();
+
+    setState(value);
+  };
+
+  useEffect(() => console.log("got", state), [state]);
+
+  return [state, setStateDelayed, setStateImmediate];
+};