修复聊天信息聚合问题

meshmap_frontend/src/components/ChatPanel.vue

@@ -26,6 +26,7 @@ const menuX = ref(0)
 const menuY = ref(0)
 const topThreshold = 8
 const bottomThreshold = 40
+const scrollOverflowAllowance = 1
 
 const groupedMessages = computed<GroupedTextMessage[]>(() => {
   const groups = new Map<string, GroupedTextMessage>()
@@ -102,25 +103,29 @@ function handleKeydown(event: KeyboardEvent) {
   }
 }
 
-function handleScroll() {
-  closeMessageMenu()
-  const el = panelRef.value
+function loadOlderFromCurrentScroll(el: HTMLElement) {
   if (
-    !el ||
     props.loadingOlder ||
     !props.hasMoreMessages ||
-    props.messages.length === 0 ||
+    groupedMessages.value.length === 0 ||
     restoreScrollHeight != null
   ) {
     return
   }
 
-  if (el.scrollTop <= topThreshold) {
-    restoreScrollHeight = el.scrollHeight
-    restoreScrollTop = el.scrollTop
-    restoreMessageCount = props.messages.length
-    emit('load-older')
+  restoreScrollHeight = el.scrollHeight
+  restoreScrollTop = el.scrollTop
+  restoreMessageCount = groupedMessages.value.length
+  emit('load-older')
+}
+
+function handleScroll() {
+  closeMessageMenu()
+  const el = panelRef.value
+  if (!el || el.scrollTop > topThreshold) {
+    return
   }
+  loadOlderFromCurrentScroll(el)
 }
 
 onBeforeUpdate(() => {
@@ -138,6 +143,9 @@ onMounted(async () => {
   if (el) {
     el.scrollTop = el.scrollHeight
     didInitialScroll = true
+    if (el.scrollHeight <= el.clientHeight + scrollOverflowAllowance) {
+      loadOlderFromCurrentScroll(el)
+    }
   }
 })
 
@@ -153,7 +161,7 @@ onUpdated(() => {
   }
 
   if (restoreScrollHeight != null) {
-    if (props.messages.length > restoreMessageCount) {
+    if (groupedMessages.value.length > restoreMessageCount) {
       el.scrollTop = el.scrollHeight - restoreScrollHeight + restoreScrollTop
       clearRestoreState()
       return
@@ -167,6 +175,10 @@ onUpdated(() => {
     el.scrollTop = el.scrollHeight
     didInitialScroll = true
   }
+
+  if (el.scrollHeight <= el.clientHeight + scrollOverflowAllowance) {
+    loadOlderFromCurrentScroll(el)
+  }
 })
 </script>
 

meshmap_frontend/src/components/NodeDetailedPage.vue

@@ -24,6 +24,7 @@ const chatHasMore = ref(true)
 const error = ref('')
 const chatPageSize = 20
 const chatHistoryRef = ref<HTMLElement | null>(null)
+const scrollOverflowAllowance = 1
 type GroupedTextMessage = TextMessage & { mergedCount: number; mergedMessages: TextMessage[] }
 type PendingDeleteAction =
   | { kind: 'delete-message'; message: GroupedTextMessage }
@@ -186,24 +187,30 @@ async function loadInitialMessages() {
   const el = chatHistoryRef.value
   if (el) {
     el.scrollTop = el.scrollHeight
+    await loadMoreUntilScrollable(el)
   }
 }
 
 async function loadOlderMessages() {
+  const el = chatHistoryRef.value
+  await loadOlderMessagesFromCurrentScroll(el)
+}
+
+async function loadOlderMessagesFromCurrentScroll(el: HTMLElement | null) {
   if (chatLoadingOlder.value || !chatHasMore.value) {
     return
   }
 
-  const el = chatHistoryRef.value
   const previousScrollHeight = el?.scrollHeight ?? 0
   const previousScrollTop = el?.scrollTop ?? 0
+  const previousGroupedMessageCount = groupedMessages.value.length
   chatLoadingOlder.value = true
   try {
     const response = await getTextMessages(chatPageSize, messages.value.length, props.nodeId)
     messages.value = mergeMessages(messages.value, toChronological(response.items))
     chatHasMore.value = response.items.length === chatPageSize
     await nextTick()
-    if (el) {
+    if (el && groupedMessages.value.length > previousGroupedMessageCount) {
       el.scrollTop = el.scrollHeight - previousScrollHeight + previousScrollTop
     }
   } catch (err) {
@@ -213,6 +220,16 @@ async function loadOlderMessages() {
   }
 }
 
+async function loadMoreUntilScrollable(el: HTMLElement) {
+  while (chatHasMore.value && el.scrollHeight <= el.clientHeight + scrollOverflowAllowance) {
+    const previousGroupedMessageCount = groupedMessages.value.length
+    await loadOlderMessagesFromCurrentScroll(el)
+    if (groupedMessages.value.length <= previousGroupedMessageCount) {
+      break
+    }
+  }
+}
+
 function closeMessageMenu() {
   menuMessage.value = null
 }