From: Benjamin Auder <benjamin.auder@somewhere>
Date: Sun, 8 Mar 2020 23:25:20 +0000 (+0100)
Subject: Experimental focus/blur detection
X-Git-Url: https://git.auder.net/images/pieces/Cwda/current/scripts/getGraph_%22%20%20%20this.image%20%20%20%22.php?a=commitdiff_plain;h=a041d5d84031f29fc001597a9ac958d6a3e6de76;p=vchess.git

Experimental focus/blur detection
---

diff --git a/client/src/views/Game.vue b/client/src/views/Game.vue
index ce42f21d..fe613ec9 100644
--- a/client/src/views/Game.vue
+++ b/client/src/views/Game.vue
@@ -14,10 +14,12 @@ main
         span {{ Object.keys(people).length + " " + st.tr["participant(s):"] }} 
         span(
           v-for="p in Object.values(people)"
-          v-if="p.name"
+          v-if="p.focus && !!p.name"
         )
           | {{ p.name }} 
-        span.anonymous(v-if="Object.values(people).some(p => !p.name && p.id === 0)")
+        span.anonymous(
+          v-if="Object.values(people).some(p => p.focus && !p.name)"
+        )
           | + @nonymous
       Chat(
         ref="chatcomp"
@@ -202,6 +204,7 @@ export default {
     this.atCreation();
   },
   mounted: function() {
+    document.addEventListener('visibilitychange', this.visibilityChange);
     document
       .getElementById("chatWrap")
       .addEventListener("click", processModalClick);
@@ -213,9 +216,18 @@ export default {
     }
   },
   beforeDestroy: function() {
+    document.removeEventListener('visibilitychange', this.visibilityChange);
     this.cleanBeforeDestroy();
   },
   methods: {
+    visibilityChange: function() {
+      // TODO: Use document.hidden? https://webplatform.news/issues/2019-03-27
+      this.send(
+        document.visibilityState == "visible"
+          ? "getfocus"
+          : "losefocus"
+      );
+    },
     atCreation: function() {
       // 0] (Re)Set variables
       this.gameRef.id = this.$route.params["id"];
@@ -226,7 +238,15 @@ export default {
       this.nextIds = JSON.parse(this.$route.query["next"] || "[]");
       // Always add myself to players' list
       const my = this.st.user;
-      this.$set(this.people, my.sid, { id: my.id, name: my.name });
+      this.$set(
+        this.people,
+        my.sid,
+        {
+          id: my.id,
+          name: my.name,
+          focus: true
+        }
+      );
       this.game = {
         players: [{ name: "" }, { name: "" }],
         chats: [],
@@ -310,7 +330,7 @@ export default {
     },
     isConnected: function(index) {
       const player = this.game.players[index];
-      // Is it me ?
+      // Is it me ? In this case no need to bother with focus
       if (this.st.user.sid == player.sid || this.st.user.id == player.uid)
         // Still have to check for name (because of potential multi-accounts
         // on same browser, although this should be rare...)
@@ -318,13 +338,15 @@ export default {
       // Try to find a match in people:
       return (
         (
-          player.sid &&
-          Object.keys(this.people).some(sid => sid == player.sid)
+          !!player.sid &&
+          Object.keys(this.people).some(sid =>
+            sid == player.sid && this.people[sid].focus)
         )
         ||
         (
           player.uid &&
-          Object.values(this.people).some(p => p.id == player.uid)
+          Object.values(this.people).some(p =>
+            p.id == player.uid && p.focus)
         )
       );
     },
@@ -400,12 +422,15 @@ export default {
       switch (data.code) {
         case "pollclients":
           data.sockIds.forEach(sid => {
-            if (sid != this.st.user.sid)
+            if (sid != this.st.user.sid) {
+              this.people[sid] = { focus: true };
               this.send("askidentity", { target: sid });
+            }
           });
           break;
         case "connect":
           if (!this.people[data.from]) {
+            this.people[data.from] = { focus: true };
             this.newConnect[data.from] = true; //for self multi-connects tests
             this.send("askidentity", { target: data.from });
           }
@@ -429,6 +454,22 @@ export default {
         case "mdisconnect":
           ArrayFun.remove(this.onMygames, sid => sid == data.from);
           break;
+        case "getfocus": {
+          let player = this.people[data.from];
+          if (!!player) {
+            player.focus = true;
+            this.$forceUpdate(); //TODO: shouldn't be required
+          }
+          break;
+        }
+        case "losefocus": {
+          let player = this.people[data.from];
+          if (!!player) {
+            player.focus = false;
+            this.$forceUpdate(); //TODO: shouldn't be required
+          }
+          break;
+        }
         case "killed":
           // I logged in elsewhere:
           this.conn = null;
@@ -447,7 +488,11 @@ export default {
         }
         case "identity": {
           const user = data.data;
-          this.$set(this.people, user.sid, { name: user.name, id: user.id });
+          let player = this.people[user.sid];
+          // player.focus is already set
+          player.name = user.name;
+          player.id = user.id;
+          this.$forceUpdate(); //TODO: shouldn't be required
           // If I multi-connect, kill current connexion if no mark (I'm older)
           if (this.newConnect[user.sid]) {
             if (
diff --git a/client/src/views/Hall.vue b/client/src/views/Hall.vue
index 5e7a10d4..271c0bcf 100644
--- a/client/src/views/Hall.vue
+++ b/client/src/views/Hall.vue
@@ -100,7 +100,7 @@ main
             )
               | {{ st.tr["Observe"] }}
             button.player-action(
-              v-else-if="st.user.id > 0 && sid != st.user.sid"
+              v-else-if="isFocusedOnHall(sid)"
               @click="challenge(sid)"
             )
               | {{ st.tr["Challenge"] }}
@@ -233,7 +233,15 @@ export default {
     if (this.st.variants.length > 0 && this.newchallenge.vid > 0)
       this.loadNewchallVariant();
     const my = this.st.user;
-    this.$set(this.people, my.sid, { id: my.id, name: my.name, pages: ["/"] });
+    this.$set(
+      this.people,
+      my.sid,
+      {
+        id: my.id,
+        name: my.name,
+        pages: [{ path: "/", focus: true }]
+      }
+    );
     // Ask server for current corr games (all but mines)
     ajax(
       "/games",
@@ -324,6 +332,7 @@ export default {
     this.conn.onclose = this.socketCloseListener;
   },
   mounted: function() {
+    document.addEventListener('visibilitychange', this.visibilityChange);
     ["peopleWrap", "infoDiv", "newgameDiv"].forEach(eltName => {
       let elt = document.getElementById(eltName);
       elt.addEventListener("click", processModalClick);
@@ -342,9 +351,18 @@ export default {
     this.setDisplay("g", showGtype);
   },
   beforeDestroy: function() {
+    document.removeEventListener('visibilitychange', this.visibilityChange);
     this.send("disconnect");
   },
   methods: {
+    visibilityChange: function() {
+      // TODO: Use document.hidden? https://webplatform.news/issues/2019-03-27
+      this.send(
+        document.visibilityState == "visible"
+          ? "getfocus"
+          : "losefocus"
+      );
+    },
     // Helpers:
     cadenceFocusIfOpened: function() {
       if (event.target.checked)
@@ -386,7 +404,16 @@ export default {
       else elt.nextElementSibling.classList.remove("active");
     },
     isGamer: function(sid) {
-      return this.people[sid].pages.some(p => p.indexOf("/game/") >= 0);
+      return this.people[sid].pages
+        .some(p => p.focus && p.path.indexOf("/game/") >= 0);
+    },
+    isFocusedOnHall: function(sid) {
+      return (
+        // This is meant to challenge people, thus the next 2 conditions:
+        this.st.user.id > 0 &&
+        sid != this.st.user.sid &&
+        this.people[sid].pages.some(p => p.path == "/" && p.focus)
+      );
     },
     challenge: function(sid) {
       // Available, in Hall (only)
@@ -398,8 +425,10 @@ export default {
       // In some game, maybe playing maybe not: show a random one
       let gids = [];
       this.people[sid].pages.forEach(p => {
-        const matchGid = p.match(/[a-zA-Z0-9]+$/);
-        if (!!matchGid) gids.push(matchGid[0]);
+        if (p.focus) {
+          const matchGid = p.path.match(/[a-zA-Z0-9]+$/);
+          if (!!matchGid) gids.push(matchGid[0]);
+        }
       });
       const gid = gids[Math.floor(Math.random() * gids.length)];
       const game = this.games.find(g => g.id == gid);
@@ -445,11 +474,12 @@ export default {
               this.send("askidentity", { target: s.sid, page: page });
               identityAsked[s.sid] = true;
             }
-            if (!this.people[s.sid])
+            if (!this.people[s.sid]) {
               // Do not set name or id: identity unknown yet
-              this.$set(this.people, s.sid, { pages: [page] });
-            else if (this.people[s.sid].pages.indexOf(page) < 0)
-              this.people[s.sid].pages.push(page);
+              this.people[s.sid] = { pages: [{path: page, focus: true}] };
+            }
+            else if (!(this.people[s.sid].pages.find(p => p.path == page)))
+              this.people[s.sid].pages.push({ path: page, focus: true });
             if (!s.page)
               // Peer is in Hall
               this.send("askchallenge", { target: s.sid });
@@ -461,18 +491,16 @@ export default {
         case "connect":
         case "gconnect": {
           const page = data.page || "/";
-          // NOTE: player could have been polled earlier, but might have logged in then
-          // So it's a good idea to ask identity if he was anonymous.
-          // But only ask game / challenge if currently disconnected.
+          // Only ask game / challenge if first connexion:
           if (!this.people[data.from]) {
-            this.$set(this.people, data.from, { pages: [page] });
+            this.people[data.from] = { pages: [{ path: page, focus: true }] };
             if (data.code == "connect")
               this.send("askchallenge", { target: data.from });
             else this.send("askgame", { target: data.from, page: page });
           } else {
             // Append page if not already in list
-            if (this.people[data.from].pages.indexOf(page) < 0)
-              this.people[data.from].pages.push(page);
+            if (!(this.people[data.from].pages.find(p => p.path == page)))
+              this.people[data.from].pages.push({ path: page, focus: true });
           }
           if (!this.people[data.from].name && this.people[data.from].id !== 0) {
             // Identity not known yet
@@ -510,11 +538,26 @@ export default {
             }
           }
           const page = data.page || "/";
-          ArrayFun.remove(this.people[data.from].pages, p => p == page);
+          ArrayFun.remove(this.people[data.from].pages, p => p.path == page);
           if (this.people[data.from].pages.length == 0)
             this.$delete(this.people, data.from);
           break;
         }
+        case "getfocus":
+          // If user reload a page, focus may arrive earlier than connect
+          if (!!this.people[data.from]) {
+            this.people[data.from].pages
+              .find(p => p.path == data.page).focus = true;
+            this.$forceUpdate(); //TODO: shouldn't be required
+          }
+          break;
+        case "losefocus":
+          if (!!this.people[data.from]) {
+            this.people[data.from].pages
+              .find(p => p.path == data.page).focus = false;
+            this.$forceUpdate(); //TODO: shouldn't be required
+          }
+          break;
         case "killed":
           // I logged in elsewhere:
           this.conn = null;
@@ -533,11 +576,13 @@ export default {
         }
         case "identity": {
           const user = data.data;
-          this.$set(this.people, user.sid, {
-            id: user.id,
-            name: user.name,
-            pages: this.people[user.sid].pages
-          });
+          let player = this.people[user.sid];
+          // player.pages is already set
+          player.id = user.id;
+          player.name = user.name;
+          // TODO: this.$set(people, ...) fails. So forceUpdate.
+          //       But this shouldn't be like that!
+          this.$forceUpdate();
           // If I multi-connect, kill current connexion if no mark (I'm older)
           if (this.newConnect[user.sid]) {
             if (
diff --git a/server/sockets.js b/server/sockets.js
index 467036e8..39cf260b 100644
--- a/server/sockets.js
+++ b/server/sockets.js
@@ -21,6 +21,7 @@ function send(socket, message) {
 module.exports = function(wss) {
   // Associative array page --> sid --> tmpId --> socket
   // "page" is either "/" for hall or "/game/some_gid" for Game,
+  // or "/mygames" for Mygames page (simpler: no 'people' array).
   // tmpId is required if a same user (browser) has different tabs
   let clients = {};
   wss.on("connection", (socket, req) => {
@@ -34,7 +35,20 @@ module.exports = function(wss) {
         Object.keys(clients[page][k]).forEach(x => {
           if (k == sid && x == tmpId) return;
           send(
-            clients[page][k][x],
+            clients[page][k][x].socket,
+            Object.assign({ code: code, from: sid }, obj)
+          );
+        });
+      });
+    };
+    // For focus events: no need to target self
+    const notifyAllButMe = (page,code,obj={}) => {
+      if (!clients[page]) return;
+      Object.keys(clients[page]).forEach(k => {
+        if (k == sid) return;
+        Object.keys(clients[page][k]).forEach(x => {
+          send(
+            clients[page][k][x].socket,
             Object.assign({ code: code, from: sid }, obj)
           );
         });
@@ -80,7 +94,7 @@ module.exports = function(wss) {
           // Self multi-connect: manual removal + disconnect
           const doKill = (pg) => {
             Object.keys(clients[pg][obj.sid]).forEach(x => {
-              send(clients[pg][obj.sid][x], {code: "killed"});
+              send(clients[pg][obj.sid][x].socket, { code: "killed" });
             });
             delete clients[pg][obj.sid];
           };
@@ -89,7 +103,7 @@ module.exports = function(wss) {
               if (k != obj.sid) {
                 Object.keys(clients[pg][k]).forEach(x => {
                   send(
-                    clients[pg][k][x],
+                    clients[pg][k][x].socket,
                     Object.assign({ code: code, from: obj.sid }, o)
                   );
                 });
@@ -154,7 +168,7 @@ module.exports = function(wss) {
             }
             const tmpId_idx = Math.floor(Math.random() * tmpIds.length);
             send(
-              clients[pg][obj.target][tmpIds[tmpId_idx]],
+              clients[pg][obj.target][tmpIds[tmpId_idx]].socket,
               { code: obj.code, from: [sid,tmpId,page] }
             );
           }
@@ -167,7 +181,7 @@ module.exports = function(wss) {
           Object.keys(clients[page][obj.target]).forEach(x => {
             if (obj.target != sid || x != tmpId)
               send(
-                clients[page][obj.target][x],
+                clients[page][obj.target][x].socket,
                 { code: obj.code, data: obj.data }
               );
           });
@@ -191,7 +205,7 @@ module.exports = function(wss) {
           if (!!obj.target && !!clients[page][obj.target]) {
             Object.keys(clients[page][obj.target]).forEach(x => {
               send(
-                clients[page][obj.target][x],
+                clients[page][obj.target][x].socket,
                 Object.assign({ code: "newmove" }, dataWithFrom)
               );
             });
@@ -207,7 +221,7 @@ module.exports = function(wss) {
             !!clients[page][obj.target[0]][obj.target[1]]
           ) {
             send(
-              clients[page][obj.target[0]][obj.target[1]],
+              clients[page][obj.target[0]][obj.target[1]].socket,
               { code: "gotmove" }
             );
           }
@@ -227,7 +241,7 @@ module.exports = function(wss) {
             Object.keys(clients[pg]).forEach(s => {
               Object.keys(clients[pg][s]).forEach(x => {
                 send(
-                  clients[pg][s][x],
+                  clients[pg][s][x].socket,
                   { code: "mconnect", from: sid }
                 );
               });
@@ -243,7 +257,7 @@ module.exports = function(wss) {
           if (!!clients[gamePg] && !!clients[gamePg][obj.target]) {
             Object.keys(clients[gamePg][obj.target]).forEach(x => {
               send(
-                clients[gamePg][obj.target][x],
+                clients[gamePg][obj.target][x].socket,
                 { code: "abort" }
               );
             });
@@ -251,6 +265,16 @@ module.exports = function(wss) {
           break;
         }
 
+        case "getfocus":
+        case "losefocus":
+          if (page == "/") notifyAllButMe("/", obj.code, { page: "/" });
+          else {
+            // Notify game room + Hall:
+            notifyAllButMe(page, obj.code);
+            notifyAllButMe("/", obj.code, { page: page });
+          }
+          break;
+
         // Passing, relaying something: from isn't needed,
         // but target is fully identified (sid + tmpId)
         case "challenge":
@@ -264,7 +288,7 @@ module.exports = function(wss) {
           // but leaving Hall, clients[pg] or clients[pg][target] could be undefined
           if (!!clients[pg] && !!clients[pg][obj.target[0]]) {
             send(
-              clients[pg][obj.target[0]][obj.target[1]],
+              clients[pg][obj.target[0]][obj.target[1]].socket,
               { code:obj.code, data:obj.data }
             );
           }
@@ -277,12 +301,13 @@ module.exports = function(wss) {
       doDisconnect();
     };
     // Update clients object: add new connexion
+    const newElt = { socket: socket, focus: true };
     if (!clients[page])
-      clients[page] = { [sid]: {[tmpId]: socket } };
+      clients[page] = { [sid]: {[tmpId]: newElt } };
     else if (!clients[page][sid])
-      clients[page][sid] = { [tmpId]: socket };
+      clients[page][sid] = { [tmpId]: newElt };
     else
-      clients[page][sid][tmpId] = socket;
+      clients[page][sid][tmpId] = newElt;
     socket.on("message", messageListener);
     socket.on("close", closeListener);
   });