app/pages/chat/components/messageList.vue

<template>
  <!--  聊天虚拟列表  -->
  <z-paging ref="pagingRef" v-model="messageList" use-chat-record-mode use-virtual-list cell-height-mode="dynamic"
    default-page-size="20" :auto-clean-list-when-reload="false" safe-area-inset-bottom bottom-bg-color="#f8f8f8"
    :back-to-top-style="backToTopStyle" :auto-show-back-to-top="showNewMessageTip" @backToTopClick="onBackToTopClick"
    @scrolltoupper="onScrollToUpper" @query="queryList">
    <template #top>
      <!-- 撑一下顶部导航 -->
      <view :style="{ height: sys_navBar + 'px' }"></view>
    </template>
    <!-- style="transform: scaleY(-1)"必须写，否则会导致列表倒置！！！ -->
    <!-- 注意不要直接在chat-item组件标签上设置style，因为在微信小程序中是无效的，请包一层view -->
    <template #cell="{ item, index }">
      <view style="transform: scaleY(-1)">
        <!--  消息渲染  -->
        <MessageListItem :message="item" :message-index="index" :message-list="messageList"></MessageListItem>
      </view>
    </template>
    <!-- 底部聊天输入框 -->
    <template #bottom>
      <slot name="bottom"></slot>
    </template>
    <!-- 查看最新消息 -->
    <template #backToTop>
      <text>有新消息</text>
    </template>
  </z-paging>
</template>

<script setup>
import MessageListItem from '@/pages/chat/components/messageListItem.vue';
import { reactive, ref } from 'vue';
import KeFuApi from '@/sheep/api/promotion/kefu';
import { isEmpty } from '@/sheep/helper/utils';
import sheep from '@/sheep';
import { formatDate } from '@/sheep/util';
import { onLoad } from '@dcloudio/uni-app';
const sys_navBar = sheep.$platform.navbar;
const messageList = ref([]); // 消息列表
const showNewMessageTip = ref(false); // 显示有新消息提示
const refreshMessage = ref(false); // 更新消息列表
const backToTopStyle = reactive({
  width: '100px',
  'background-color': '#fff',
  'border-radius': '30px',
  'box-shadow': '0 2px 4px rgba(0, 0, 0, 0.1)',
  display: 'flex',
  justifyContent: 'center',
  alignItems: 'center',
}); // 返回顶部样式
const queryParams = reactive({
  no: 1, // 查询次数，只用于触底计算
  limit: 20,
  createTime: undefined,
});
onLoad((options) => {
  if (options.conversationId) {
    queryParams.conversationId = options.conversationId
  } else {
    queryParams.conversationId = '1'
  }
})
const pagingRef = ref(null); // 虚拟列表
const queryList = async (no, limit) => {
  // 组件加载时会自动触发此方法，因此默认页面加载时会自动触发，无需手动调用
  queryParams.no = no;
  queryParams.limit = limit;
  await getMessageList();
};
// 获得消息分页列表
const getMessageList = async () => {

  const { data } = await KeFuApi.getKefuMessageList(queryParams);
  if (isEmpty(data)) {
    pagingRef.value.completeByNoMore([], true);
    return;
  }
  if (queryParams.no > 1 && refreshMessage.value) {
    const newMessageList = [];
    for (const message of data) {
      if (messageList.value.some((val) => val.id === message.id)) {
        continue;
      }
      newMessageList.push(message);
    }
    // 新消息追加到开头
    messageList.value = [...newMessageList, ...messageList.value];
    pagingRef.value.updateCache(); // 更新缓存
    refreshMessage.value = false; // 更新好后重置状态
    return;
  }
  if (data.slice(-1).length > 0) {
    // 设置最后一次历史查询的最后一条消息的 createTime
    queryParams.createTime = formatDate(data.slice(-1)[0].createTime);
  }
  pagingRef.value.completeByNoMore(data, false);
};
/** 刷新消息列表 */
const refreshMessageList = async (message = undefined) => {
  if (typeof message !== 'undefined') {
    // 追加数据
    pagingRef.value.addChatRecordData([message], false);
  } else {
    queryParams.createTime = undefined;
    refreshMessage.value = true;
    await getMessageList();
  }

  // 若已是第一页则不做处理
  if (queryParams.no > 1) {
    showNewMessageTip.value = true;
  } else {
    onScrollToUpper();
  }
};

/** 滚动到最新消息 */
const onBackToTopClick = (event) => {
  event(false); // 禁用默认操作
  pagingRef.value.scrollToBottom();
};
/** 监听滚动到底部事件（因为 scroll 翻转了顶就是底） */
const onScrollToUpper = () => {
  // 若已是第一页则不做处理
  if (queryParams.no === 1) {
    return;
  }
  showNewMessageTip.value = false;
};
// 暴露方法 修改消息列表指定的消息
const updateMessage = (items, messageId = '') => {
  messageList.value = messageList.value.map((item) => {
    if (item.ids == 1) {
      delete item.ids
      item.content = items.content
      item.messageId = items.messageId
      item.isAi = true
      return item;
    } else {
      if (messageId == "") {
        if (item.messageId == items.messageId) {
          item.content += items.content
        }
      } else {
        if (item.messageId == messageId) {
          item.isAi = false
        }
      }
      return item;
    }
  });
}
// 通过id 获取对应的头像
const getAvatar = (id) => {
  return messageList.value[messageList.value.length - 1]
}

defineExpose({ getMessageList, refreshMessageList, updateMessage, messageList, getAvatar });
</script>