fix: 修复消息滚动相关bug

src/components/VirtualList/index.tsx

@@ -186,13 +186,15 @@ export default defineComponent({
     /**
      * 滚动到指定索引
      * @param index 索引值
+     * @param smooth 是否平滑滚动
+     * @param topDistance 顶部间隔距离
      * @description 如果索引值大于等于数据长度说明到底了则滚动到底部
      */
-    const scrollToIndex = (index: number, smooth?: boolean) => {
+    const scrollToIndex = (index: number, smooth?: boolean, topDistance = 0) => {
       if (index >= props.data.length - 1) {
         scrollToBottom()
       } else {
-        const offset = virtual.getOffset(index)
+        const offset = virtual.getOffset(index) - topDistance
         scrollToOffset(offset, smooth)
       }
     }

src/stores/chat.ts

@@ -32,6 +32,9 @@ export const useChatStore = defineStore('chat', () => {
         params: { pageSize: size, cursor: cursor.value, roomId: 1 },
       })
       .send()
+      .catch(() => {
+        isLoading.value = false
+      })
     if (!data) return
     const computedList = computedTimeBlock(data.list)
     computedList.forEach((msg) => {

src/views/Home/components/ChatList/MsgItem/index.vue

@@ -75,7 +75,7 @@ const scrollToMsg = async (msg: MsgType) => {
   // 如果消息已经加载过了，就直接跳转
   const index = chatStore.getMsgIndex(reply.id)
   if (index > -1) {
-    virtualListRef?.value?.scrollToIndex(index, true)
+    virtualListRef?.value?.scrollToIndex(index, true, 12)
   } else {
     // 如果没有加载过，就先加载，然后跳转
     const curMsgIndex = chatStore.getMsgIndex(id)
@@ -85,7 +85,7 @@ const scrollToMsg = async (msg: MsgType) => {
     await chatStore.loadMore(needLoadPageSize)
     // 跳转
     // FIXME 这时候新加载消息了，所以会有滚动冲突，故不加动画效果，否则会很怪异。
-    setTimeout(virtualListRef?.value?.scrollToIndex(chatStore.getMsgIndex(reply.id), false), 0)
+    setTimeout(virtualListRef?.value?.scrollToIndex(chatStore.getMsgIndex(reply.id), false, 12), 0)
     // TODO 跳转到的消息 高亮一下
   }
 }

src/views/Home/components/ChatList/MsgItem/styles.scss

@@ -60,6 +60,8 @@
     width: fit-content;
     min-height: 1em;
     padding: 8px 12px;
+    font-size: 15px;
+    line-height: 22px;
     color: #fff;
     word-break: break-word;
     white-space: pre-line;

src/views/Home/components/ChatList/index.vue

@@ -17,6 +17,12 @@ const goToBottom = () => {
   }
 }
 
+// 回到最新消息
+const goToNewMessage = () => {
+  // 未读消息数 = 总数 - 新消息数
+  virtualListRef.value.scrollToIndex(chatStore.chatMessageList.length - chatStore.newMsgCount)
+}
+
 // 提供虚拟列表 ref 给子组件使用
 provide('virtualListRef', virtualListRef)
 
@@ -29,14 +35,12 @@ onMounted(() => {
 })
 
 // 到顶部时触发函数 记录旧的滚动高度，加载更多消息后滚动回加载时那条消息的位置
-const onTotop = throttle(async () => {
-  const oldScrollTop = virtualListRef.value.getScrollSize()
+const onTotop = async () => {
+  if (chatStore.isLoading) return
+  const oldIndex = virtualListRef.value.getSizes()
   await chatStore.loadMore()
-  nextTick(() => {
-    const newScrollTop = virtualListRef.value.getScrollSize() - oldScrollTop
-    virtualListRef.value.scrollToOffset(newScrollTop)
-  })
-}, 1600)
+  virtualListRef.value.scrollToIndex(virtualListRef.value.getSizes() - oldIndex)
+}
 
 // 滚动时触发函数，主要处理新消息提示
 const onScroll = throttle((eventData) => {
@@ -78,8 +82,8 @@ const getKey = (item: MessageType) => item.message.id
     <template v-if="!chatStore.isLoading && chatStore.chatMessageList?.length === 0">
       <div class="empty">暂无消息，快来发送第一条消息吧~</div>
     </template>
-    <span class="new-msgs-tips" v-show="chatStore.newMsgCount > 0" @click="goToBottom">
-      {{ chatStore.newMsgCount }}条新消息
+    <span class="new-msgs-tips" v-show="chatStore.newMsgCount > 0" @click="goToNewMessage">
+      {{ chatStore.newMsgCount }} 条新消息
       <el-icon :size="10"><IEpArrowDownBold /></el-icon>
     </span>
   </div>

src/views/Home/components/ChatList/styles.scss

@@ -17,14 +17,14 @@
   perspective: 1000;
 
   .loading {
-    display: flex;
+    position: absolute;
+    z-index: 20;
     gap: 4px;
-    align-items: center;
-    justify-content: center;
     width: 100%;
-    margin-bottom: 4px;
+    padding: 16px 0;
     font-size: 14px;
-    color: #999;
+    color: #eee;
+    background: linear-gradient(180deg, rgb(50 54 68 / 100%) 0%, rgb(50 54 68 / 0%) 85%);
 
     svg {
       @keyframes rotate {
@@ -61,14 +61,14 @@
   align-items: center;
   padding: 2px 12px;
   font-size: 14px;
-  line-height: 1;
+  color: var(--el-color-primary-light-3);
   cursor: pointer;
-  background-color: var(--color-gray-bg);
-  border: 1px solid #fff;
+  background-color: var(--color-dark-bg);
   border-radius: 12px;
+  box-shadow: 0 0 1px 1px var(--el-box-shadow-dark);
 
   &:hover {
-    background-color: var(--color-primary);
+    background-color: #1a1c22;
   }
 }