support switching conversation without close

net/web/src/User/Conversation/useConversation.hook.js

@@ -7,6 +7,8 @@ import { ChannelContext } from 'context/ChannelContext';
 export function useConversation() {
   
   const [state, setState] = useState({
+    cardId: null,
+    channelId: null,
     topics: [],
   });
 
@@ -17,6 +19,7 @@ export function useConversation() {
   const conversation = useContext(ConversationContext);
   const topics = useRef(new Map());
   const revision = useRef(null);
+  const id = useRef({});
 
   const updateState = (value) => {
     setState((s) => ({ ...s, ...value }));
@@ -101,10 +104,27 @@ export function useConversation() {
   }
 
   useEffect(() => {
-    if (card.state.init && channel.state.init) {
-      updateConversation();
+    if (id.current.channelId != channelId || id.current.cardId) {
+      id.current = { cardId, channelId };
+      topics.current = new Map();
+      revision.current = null;
+      updateState({ cardId, channelId, topics: [] });
     }
-  }, [card, channel]);
+    if (card.state.init && channel.state.init) {
+      if (cardId) {
+        if(card.state.cards.get(cardId)?.data.cardDetail.status != 'connected') {
+          window.alert("You are no longer connected to the host");
+          navigate('/user')
+        }
+      }
+      try {
+        updateConversation();
+      }
+      catch (err) {
+        console.log(err);
+      }
+    }
+  }, [card, channel, cardId, channelId]);
 
   return { state, actions };
 }

net/web/src/VirtualList/VirtualList.jsx

@@ -2,7 +2,7 @@ import React, { useRef, useState, useEffect } from 'react';
 import { VirtualListWrapper, VirtualItem } from './VirtualList.styled';
 import ReactResizeDetector from 'react-resize-detector';
 
-export function VirtualList({ items, itemRenderer }) {
+export function VirtualList({ id, items, itemRenderer }) {
 
   const REDZONE = 256; // recenter on canvas if in canvas edge redzone
   const HOLDZONE = 512; // drop slots outside of holdzone of view
@@ -21,6 +21,7 @@ export function VirtualList({ items, itemRenderer }) {
   let containers = useRef([]);
   let anchorBottom = useRef(true);
   let listRef = useRef();
+  let view = useRef(null);
 
   const addSlot = (id, slot) => {
     setSlots((m) => { m.set(id, slot); return new Map(m); })
@@ -34,6 +35,10 @@ export function VirtualList({ items, itemRenderer }) {
     setSlots((m) => { m.delete(id); return new Map(m); })
   }
 
+  const clearSlots = () => {
+    setSlots((m) => { new Map() })
+  }
+
   const growCanvasHeight = (val) => {
     setCanvasHeight((h) => {
       if (val > h) {
@@ -51,8 +56,17 @@ export function VirtualList({ items, itemRenderer }) {
   }, [viewHeight]);
 
   useEffect(() => {
+    if (view.current != id) {
+      view.current = id;
+      latch.current = true;
+      containers.current = [];
+      anchorBottom.current = true;
+      scrollTop.current = 0;
+      listRef.current.scrollTo({ top: scrollTop.current, left: 0 });
+      clearSlots();
+    }
     setItems();
-  }, [items]);
+  }, [items, id]);
 
   useEffect(() => {
     if (latch.current) {

net/web/src/context/useCardContext.hook.js

@@ -91,6 +91,10 @@ export function useCardContext() {
             cur.data.notifiedChannel = card.data.notifiedChannel;
           }
         }
+        else {
+          cur.channels = new Map();
+          cur.articles = new Map();
+        }
         cur.revision = card.revision;
         cards.current.set(card.id, cur);
       }
@@ -137,7 +141,12 @@ export function useCardContext() {
     if (next.current == null) {
       next.current = rev;
       if (revision.current != rev) {
-        await updateCards();
+        try {
+          await updateCards();
+        }
+        catch(err) {
+          console.log(err);
+        }
         updateState({ init: true, cards: cards.current });
         revision.current = rev;
       }
@@ -171,8 +180,11 @@ export function useCardContext() {
     },
     getCardByGuid: getCardByGuid,
     getImageUrl: (cardId) => {
-      let { data } = cards.current.get(cardId);
-      return getCardImageUrl(access.current, cardId, data.profileRevision)
+      let card = cards.current.get(cardId);
+      if (!card) {
+        return null;
+      }
+      return getCardImageUrl(access.current, cardId, card.data.profileRevision)
     },
     addChannelTopic: async (cardId, channelId, message, assets) => {
       let { cardProfile, cardDetail } = cards.current.get(cardId).data;
@@ -183,7 +195,7 @@ export function useCardContext() {
     getChannelRevision: (cardId, channelId) => {
       let card = cards.current.get(cardId);
       let channel = card.channels.get(channelId);
-      return channel.revision;
+      return channel?.revision;
     },
     getChannelTopics: async (cardId, channelId, revision) => {
       let card = cards.current.get(cardId);