initial implemention

webapp/src/api/games.js

@@ -22,7 +22,13 @@ export default function useGamesApi(gamesReducer, config) {
         
         pushNewGame: (reqParams) => doPushing('/api/gameproposal', 'POST', reqParams, {
             onPushing: (isPushingNewGame) => dispatchGames({ type: 'next', isPushingNewGame }),
-            onSuccess: (game) => dispatchGames({ type: 'next', gamesList: [...games.gamesList, game] })
+            onSuccess: (game) => dispatchGames({ type: 'next', gamesList: [...games.gamesList, game], newGame: emptyNewGame })
         }),
     }
 }
+
+const emptyNewGame = {
+    whitePlayer: '', 
+    blackPlayer: '',
+    message2opponent: ''
+}

webapp/src/container/Games.jsx

@@ -16,6 +16,7 @@ import Backward from './games/action/Backward';
 import Forward from './games/action/Forward';
 
 import GameBoard from './games/GameBoard';
+import Message2Opponent from './games/Message2Opponent';
 
 import './Games.css';
 
@@ -27,14 +28,15 @@ export default function Games({ context: { gamesReducer, gamesApi }, players })
       <div className='Games'>
         <div className='left-side'>
           <ViewSelector />
-          <ViewProvider players={players} dispatchGames={dispatchGames} />
+          <ViewProvider gamesReducer={gamesReducer} players={players} />
         </div>
         <div className='right-side'>
-          <ActionPanel players={players} gamesApi={gamesApi} />
+          <ActionPanel gamesApi={gamesApi} players={players} />
           <GameBoard />
+          <Message2Opponent dispatchGames={dispatchGames} />
           {/*
           <GameMessage />
-          <Message2Opponent /> */}
+           */}
         </div>
       </div >
     </GamesContext.Provider>
@@ -54,15 +56,19 @@ function ViewSelector() {
   )
 }
 
-function ViewProvider({ players, dispatchGames }) {
+function ViewProvider({ gamesReducer, players }) {
+  const [/*games*/, dispatchGames] = gamesReducer;
+
   return (
     <div className='ViewProvider'>
       <Routes>
 
         <Route path='new' element={
           <NewGame
+            onSelectPlayer={(whitePlayer, blackPlayer) => {
+              dispatchGames({ type: 'nextNewGame', whitePlayer, blackPlayer })
+            }}
             players={players}
-            onSelectPlayer={(whitePlayer, blackPlayer) => dispatchGames({ type: "next", newGame: { whitePlayer, blackPlayer } })}
           />
         } />
 

webapp/src/container/games/Message2Opponent.jsx

@@ -0,0 +1,62 @@
+import React, { useContext, /* useEffect,*/ 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);
+
+  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 (matchPath('/games/new', pathname)) {
+      if (message2opponent !== games.newGame.message2opponent)
+        setMessage2opponent(games.newGame.message2opponent);
+    } 
+    else
+      if (message2opponent !== '') {
+        setMessage2opponent('');
+      }
+  }
+
+  console.log('timeout.current', timeoutIdRef.current)
+  /* --- */
+
+
+  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);
+
+    if (timeoutIdRef.current)
+      clearTimeout(timeoutIdRef.current); // cancel previous sync
+
+    timeoutIdRef.current = setTimeout(() => delayedSync(value), 500);
+  }
+
+
+  //var gpathname;
+  //useLocationChange(({ pathname }) => {
+
+
+  return (
+    <input className='Message2Opponent'
+      placeholder='Message to opponent'
+      value={message2opponent}
+      maxLength={150}
+      onChange={e => onChange(e.target.value)}
+    />
+  )
+}

webapp/src/container/games/action/Create.jsx

@@ -29,7 +29,7 @@ export default function Create({ isCurrentUser, pushNewGame }) {
             opponentName,
             opponentColor,
             board: null, // default board configuration
-            message: 'default NewGame req message'
+            message: games.newGame.message2opponent
         }
 
         pushNewGame(reqParams);

webapp/src/hook/Location.js

@@ -0,0 +1,46 @@
+import { useRef, useEffect } from 'react';
+import { useLocation } from 'react-router-dom';
+
+export default function usePrevious(value) {
+    const ref = useRef();
+
+    useEffect(() => {
+        ref.current = value;
+    });
+
+    return ref.current;
+}
+
+/* Usage example
+
+const useLocationChange = (action) => {
+    const location = useLocation();
+    const prevLocation = usePrevious(location);
+
+    useEffect(() => { 
+        action(location, prevLocation);
+    }, [location]);
+}
+
+*/
+
+// runs action(location) on location, i.e. route, change
+export const useLocationChange = (action) => {
+    const location = useLocation();
+    const prevLocation = usePrevious(location);
+
+    useEffect(() => {
+        if (location !== prevLocation)
+            action(location, prevLocation);
+    }, [action, location, prevLocation]);
+}
+
+/*
+ * Usage example
+ */ 
+// const MyComponent1 = () => {
+//     useLocationChange((location) => {
+//         console.log('handle route change here', location)
+//     });
+//     // other code
+// }

webapp/src/hook/Previous.js

@@ -1,24 +0,0 @@
-import { useRef, useEffect } from 'react';
-
-export default function usePrevious(value) {
-    const ref = useRef();
-    
-    useEffect(() => {
-        ref.current = value;
-    });
-
-    return ref.current;
-}
-
-/* Usage example
-
-const useLocationChange = (action) => {
-    const location = useLocation();
-    const prevLocation = usePrevious(location);
-
-    useEffect(() => { 
-        action(location, prevLocation);
-    }, [location]);
-}
-
-*/

webapp/src/reducer/games.js

@@ -6,7 +6,8 @@ const initialState = {
 
   newGame: {
     whitePlayer: '',
-    blackPlayer: ''
+    blackPlayer: '',
+    message2opponent: '',
   },
 
   // Network
@@ -20,6 +21,12 @@ function reducer(state, action) {
     case 'next':
       return nextState(state, action);
 
+    case 'nextNewGame':
+      return {
+        ...state,
+        newGame: nextState(state.newGame, action)
+      };
+
     default:
       throw Error('GamesReducer: unknown action.type', action.type);
   }