ai对话分页

pages/Chat/Chat.vue

@@ -122,7 +122,11 @@
 
 			<view class="main-chat">
 				<scroll-view class="chat-messages" direction="vertical" scroll-y :scroll-into-view="scrollToView"
-					:upper-threshold="0" :scroll-with-animation="!isThinking" @scroll="onScroll">
+					:upper-threshold="50" :scroll-with-animation="!isThinking" @scroll="onScroll" @scrolltoupper="onScrollToUpper">
+					<!-- 加载更多提示（AI 会话） -->
+					<view v-if="ChatType === 0 && isAILoadingMore" class="load-more-tip">
+						<text>加载更多消息...</text>
+					</view>
 					<!-- 消息加载中弹窗（仅会话变化时显示） -->
 					<view v-if="isLoadingMessages" class="messages-loading-overlay">
 						<view class="messages-loading-card">
@@ -1685,7 +1689,11 @@ import { openFile as openFileNative, downloadAndOpen } from '@/utils/fileOpener.
 	const bottomToggle = ref(false)
 	// 加载状态和分页相关变量
 	const isLoadingMore = ref(false) // 是否正在加载更多
+	const isAILoadingMore = ref(false) // AI 会话是否正在加载更多（滚动到顶部触发）
+	const aiPageNumber = ref(0) // AI 会话当前服务端页码（0-based）
+	const hasMoreAIMessages = ref(true) // AI 会话是否还有更多消息可加载
 	const currentPage = ref(1) // 当前页码（如果后端支持分页）
+	const pageSize = 200;
 	// 计算属性：自动根据 allmessages 和 currentPage 计算显示消息
 	const currentMessages = computed(() => {
 		// return allmessages.value.slice(-pageInfoNumber);
@@ -1696,8 +1704,12 @@ import { openFile as openFileNative, downloadAndOpen } from '@/utils/fileOpener.
 	// 获取对话消息
 	const takeConversationMessages = async () => {
 		try {
-			allmessages.value = await getConversationMessages(userToken.value, currentSessionId.value) || [];
-			// console.log("获取到的所有消息：", JSON.stringify(allmessages.value) );
+			aiPageNumber.value = 0
+			hasMoreAIMessages.value = true
+			const rawMessages = await getConversationMessages(userToken.value, currentSessionId.value, pageSize, 0) || [];
+			// API 返回的数据已被过滤，无法通过数量判断是否有更多，始终尝试加载更多
+			allmessages.value = rawMessages
+			console.log("获取到的所有消息：", JSON.stringify(allmessages.value) );
 			// console.log("获取到的所有消息：", allmessages.value);
 			// currentMessages.value = allmessages.value.slice(-pageInfoNumber);
 			// 数据获取后执行滚动
@@ -1766,7 +1778,39 @@ import { openFile as openFileNative, downloadAndOpen } from '@/utils/fileOpener.
 	// 	// currentMessages.value = allmessages.value.slice(-pageInfoNumber);
 	// }
 
+	// 滚动到顶部时加载更多 AI 消息
+	const onScrollToUpper = async () => {
+		if (ChatType.value === 0) {
+			await loadMoreAIMessages()
+		}
+	}
 
+	// 加载更多 AI 历史消息（上一页），并定位到原第一条消息
+	const loadMoreAIMessages = async () => {
+		if (isAILoadingMore.value || !hasMoreAIMessages.value || !currentSessionId.value) return
+		isAILoadingMore.value = true
+		try {
+			const nextPage = aiPageNumber.value + 1
+			const olderMessages = await getConversationMessages(userToken.value, currentSessionId.value, pageSize, nextPage)
+
+			if (olderMessages && olderMessages.length > 0) {
+				aiPageNumber.value = nextPage
+				allmessages.value = [...olderMessages, ...allmessages.value]
+
+				// 定位滚动：原本第一条消息（old index 0）现在在 index = olderMessages.length 处
+				await nextTick()
+				scrollToView.value = 'msg-' + olderMessages.length
+			} else {
+				// 只有 API 返回空时才确认没有更多
+				hasMoreAIMessages.value = false
+			}
+		} catch (e) {
+			console.error('加载更多消息失败:', e)
+			uni.showToast({ title: '加载更多失败', icon: 'none' })
+		} finally {
+			isAILoadingMore.value = false
+		}
+	}
 
 	// 监听滚动
 	const onScroll = (e) => {}