cleanup

webapp/src/container/games/Message2Opponent.jsx

@@ -1,62 +1,48 @@
-import React, { useContext, /* useEffect,*/ useRef, useState } from 'react';
+import React, { useContext, useRef, useState } from 'react';
 import { useLocation, matchPath } from 'react-router-dom';
 import { GamesContext } from '../../context/games';
-//import { useLocationChange } from '../../hook/Location';
 
 export default function Message2Opponent({ dispatchGames }) {
   const games = useContext(GamesContext);
-  const [message2opponent, setMessage2opponent] = useState('');
   const { pathname } = useLocation();
-  const timeoutIdRef = useRef(null);
+  const [value, setValue] = useState('');
+  const syncTimeoutRef = useRef(null);
 
-  if (timeoutIdRef.current === null) {
-    // sync: internal <- external
-    // Sync external and internsl states only in abnsence of a delay timer
-    console.log("check message", message2opponent);
+  if (syncTimeoutRef.current === null) { // <<--- Absorb external value if there is no scheduled sync
     if (matchPath('/games/new', pathname)) {
-      if (message2opponent !== games.newGame.message2opponent)
-        setMessage2opponent(games.newGame.message2opponent);
-    } 
-    else
-      if (message2opponent !== '') {
-        setMessage2opponent('');
+      if (value !== games.newGame.message2opponent)
+        setValue(games.newGame.message2opponent);
+    } else if (value !== '') {
+      setValue('');
     }
   }
 
-  console.log('timeout.current', timeoutIdRef.current)
   /* --- */
 
+  const sync = (message2opponent) => {
+    syncTimeoutRef.current = null;
 
-  const delayedSync = (message2opponent) => {
-    timeoutIdRef.current = null;
-
-    // sync: internl -> external
     if (matchPath('/games/new', pathname))
       return dispatchGames({ type: 'nextNewGame', message2opponent });
 
     console.warn('unknown path');
   }
 
-  const onChange = (value) => {
-    setMessage2opponent(value);
+  const update = (value) => {
+    setValue(value);
 
-    if (timeoutIdRef.current)
-      clearTimeout(timeoutIdRef.current); // cancel previous sync
+    if (syncTimeoutRef.current)
+      clearTimeout(syncTimeoutRef.current); // <<--- Cancel previous sync
 
-    timeoutIdRef.current = setTimeout(() => delayedSync(value), 500);
+    syncTimeoutRef.current = setTimeout(() => sync(value), 500);
   }
 
-
-  //var gpathname;
-  //useLocationChange(({ pathname }) => {
-
-
   return (
     <input className='Message2Opponent'
       placeholder='Message to opponent'
-      value={message2opponent}
+      value={value}
       maxLength={150}
-      onChange={e => onChange(e.target.value)}
+      onChange={e => update(e.target.value)}
     />
   )
 }