From 1eca2cb273b83d660f875148fa23a7643956e4db Mon Sep 17 00:00:00 2001
From: chenchun <chenchun@hytch.com>
Date: Wed, 17 Dec 2025 16:50:00 +0800
Subject: [PATCH] =?UTF-8?q?perf:=20=E4=BC=98=E5=8C=96=E7=89=88=E6=9C=AC?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../src/components/ChatMessageList/index.vue  | 53 ++++++++++++-------
 1 file changed, 34 insertions(+), 19 deletions(-)

diff --git a/Yi.Ai.Vue3/src/components/ChatMessageList/index.vue b/Yi.Ai.Vue3/src/components/ChatMessageList/index.vue
index 0f4d15a9..7a107040 100644
--- a/Yi.Ai.Vue3/src/components/ChatMessageList/index.vue
+++ b/Yi.Ai.Vue3/src/components/ChatMessageList/index.vue
@@ -54,7 +54,7 @@
 </template>
 
 <script setup lang="ts">
-import { ref, nextTick, onMounted, onUnmounted, watch } from 'vue';
+import { ref, nextTick, onMounted, onUnmounted } from 'vue';
 
 interface MessageItem {
   key?: number;
@@ -81,6 +81,7 @@ const autoScroll = ref(true); // 是否自动滚动到底部
 const isUserScrolling = ref(false); // 用户是否正在手动滚动
 let scrollTimeout: any = null;
 let mutationObserver: MutationObserver | null = null;
+let scrollRAF: number | null = null; // 用于存储 requestAnimationFrame ID
 
 /**
  * 检查是否滚动到底部
@@ -93,15 +94,29 @@ function isScrolledToBottom(): boolean {
 }
 
 /**
- * 平滑滚动到底部（不使用 smooth 行为，避免跳动）
+ * 立即滚动到底部（用于内容快速变化时）
+ */
+function scrollToBottomImmediate() {
+  if (!scrollContainer.value || !autoScroll.value) return;
+  scrollContainer.value.scrollTop = scrollContainer.value.scrollHeight;
+}
+
+/**
+ * 平滑滚动到底部（使用 RAF 避免过度调用）
  */
 function scrollToBottomSmooth() {
   if (!scrollContainer.value || !autoScroll.value) return;
 
-  requestAnimationFrame(() => {
+  // 取消之前的 RAF，避免重复调用
+  if (scrollRAF !== null) {
+    cancelAnimationFrame(scrollRAF);
+  }
+
+  scrollRAF = requestAnimationFrame(() => {
     if (scrollContainer.value) {
       scrollContainer.value.scrollTop = scrollContainer.value.scrollHeight;
     }
+    scrollRAF = null;
   });
 }
 
@@ -159,10 +174,21 @@ function observeContentChanges() {
   if (!contentElement) return;
 
   // 创建 MutationObserver 监听内容变化
-  mutationObserver = new MutationObserver(() => {
+  mutationObserver = new MutationObserver((mutations) => {
     // 如果启用了自动滚动且用户没有在滚动，则滚动到底部
     if (autoScroll.value && !isUserScrolling.value) {
-      scrollToBottomSmooth();
+      // 检查是否有文本内容变化（characterData），这通常是 SSE 流式输出
+      const hasCharacterDataChange = mutations.some(
+        mutation => mutation.type === 'characterData'
+      );
+
+      if (hasCharacterDataChange) {
+        // SSE 流式输出时使用立即滚动，避免跳动
+        scrollToBottomImmediate();
+      } else {
+        // 其他情况使用平滑滚动
+        scrollToBottomSmooth();
+      }
     }
   });
 
@@ -175,20 +201,6 @@ function observeContentChanges() {
   });
 }
 
-// 监听列表变化
-watch(
-  () => props.list,
-  () => {
-    // 列表变化时，如果启用了自动滚动，滚动到底部
-    if (autoScroll.value) {
-      nextTick(() => {
-        scrollToBottomSmooth();
-      });
-    }
-  },
-  { deep: true }
-);
-
 // 组件挂载时初始化
 onMounted(() => {
   if (scrollContainer.value) {
@@ -211,6 +223,9 @@ onUnmounted(() => {
   if (scrollTimeout) {
     clearTimeout(scrollTimeout);
   }
+  if (scrollRAF !== null) {
+    cancelAnimationFrame(scrollRAF);
+  }
   if (mutationObserver) {
     mutationObserver.disconnect();
   }