feat: lazy load reply

2023-09-15 21:45:44 +08:00 · 2023-09-15 21:45:44 +08:00 · dbdcfa84fd
parent cd511f5ede
commit dbdcfa84fd
6 changed files with 153 additions and 104 deletions
--- a/src/store/modules/topic.ts
+++ b/src/store/modules/topic.ts
@ -44,6 +44,11 @@ interface CommentDraft {
  content: string
 }

+// 获取回复的请求
+interface ReplyRequest {
+  sortField: string
+  sortOrder: 'asc' | 'desc'
+}
 // 话题页面的 store
 interface Topic {
  // 是否正在被编辑
@ -56,7 +61,7 @@ interface Topic {
  // 回复的缓存
  replyDraft: ReplyDraft
  // 获取回复的请求接口格式
-  replyRequest: TopicReplyRequestData
+  replyRequest: ReplyRequest

  // 评论的缓存
  commentDraft: CommentDraft
@ -81,11 +86,8 @@ export const useKUNGalgameTopicStore = defineStore({
      publishStatus: false,
    },
    replyRequest: {
-      tid: 0,
-      page: 1,
-      limit: 5,
      sortField: '',
-      sortOrder: '',
+      sortOrder: 'asc',
    },
    commentDraft: {
      c_uid: 0,
@ -135,13 +137,17 @@ export const useKUNGalgameTopicStore = defineStore({
      })
    },
    // 获取回复
-    getReplies(tid: number): Promise<TopicReplyResponseData> {
+    getReplies(
+      tid: number,
+      page?: number,
+      limit?: number
+    ): Promise<TopicReplyResponseData> {
      return new Promise((resolve, reject) => {
        // 这里的默认值用于初始化
        const requestData: TopicReplyRequestData = {
          tid: tid,
-          page: this.replyRequest.page || 1,
-          limit: this.replyRequest.limit || 5,
+          page: page || 1,
+          limit: limit || 5,
          sortField: this.replyRequest.sortField || 'floor',
          sortOrder: this.replyRequest.sortOrder || 'desc',
        }
--- a/src/views/topic/KUNGalgameTopicPage.vue
+++ b/src/views/topic/KUNGalgameTopicPage.vue
@ -9,8 +9,11 @@ import {
  onBeforeMount,
  computed,
  watch,
+  onBeforeUnmount,
 } from 'vue'
-import { onBeforeRouteLeave } from 'vue-router'
+import { onBeforeRouteLeave, useRoute } from 'vue-router'
+
+import { TopicDetail, TopicReply } from '@/api'

 // Aside
 import Aside from './aside/Aside.vue'
@ -25,13 +28,9 @@ const ReplyPanel = defineAsyncComponent(
 import { useKUNGalgameSettingsStore } from '@/store/modules/settings'
 // 导入话题页面 store
 import { useKUNGalgameTopicStore } from '@/store/modules/topic'
-
 import { storeToRefs } from 'pinia'

-import { TopicDetail, TopicReply } from '@/api'
-
-import { useRoute } from 'vue-router'
-
+// 当前的路由
 const route = useRoute()

 // 使用设置面板的 store
@ -51,18 +50,20 @@ const tid = computed(() => {
 const topicData = ref<TopicDetail>()
 // 单个话题的回复数据
 const repliesData = ref<TopicReply[]>([])
+// 页面的容器，用于计算是否到达底部
+const content = ref<HTMLElement>()
+// 当前的页数
+const currentPage = ref(1)
+// 是否加载，因为已经加载完了
+const isLoading = ref(true)

-const fetchTopicData = async () => {
+/** 这里拿到的已经是后端返回回来的 data 数据了  */
+onMounted(async () => {
  // 获取单个话题的数据
  const topicResponseData = (
    await useKUNGalgameTopicStore().getTopicByTid(tid.value)
  ).data
  topicData.value = topicResponseData
-}
-
-/** 这里拿到的已经是后端返回回来的 data 数据了  */
-onMounted(async () => {
-  await fetchTopicData()
 })

 // 调用 getReplies 获取回复数据（watch 大法好！）
@ -73,13 +74,66 @@ watch(
    replyDraft.value.publishStatus,
  ],
  async () => {
-    repliesData.value = (
+    const replyResponseData = (
      await useKUNGalgameTopicStore().getReplies(tid.value)
    ).data
+    repliesData.value = replyResponseData
  },
  { immediate: true }
 )

+// 滚动事件处理函数
+const scrollHandler = async () => {
+  // 滚动到底部的处理逻辑
+  if (isScrollAtBottom() && isLoading.value) {
+    // 自动增加页数
+    currentPage.value++
+    // 获取下一页的回复数据
+
+    const lazyLoadReplies = await useKUNGalgameTopicStore().getReplies(
+      tid.value,
+      currentPage.value
+    )
+
+    // 判断是否已经将数据加载完，加载完则不需要加载了
+    if (!lazyLoadReplies.data.length) {
+      isLoading.value = false
+    }
+
+    // 将新加载的回复数据追加到已有的回复数据中
+    repliesData.value = [...repliesData.value, ...lazyLoadReplies.data]
+  }
+}
+
+// 判断是否滚动到底部
+const isScrollAtBottom = () => {
+  if (content.value) {
+    const scrollHeight = content.value.scrollHeight
+    const scrollTop = content.value.scrollTop
+    const clientHeight = content.value.clientHeight
+
+    return scrollHeight - scrollTop === clientHeight
+  }
+}
+
+// 在组件挂载后，添加滚动事件监听器
+onMounted(() => {
+  // 获取滚动元素的引用
+  const element = content.value
+
+  if (element) {
+    element.addEventListener('scroll', scrollHandler)
+  }
+})
+
+// 在组件卸载前，移除滚动事件监听器
+onBeforeUnmount(() => {
+  const element = content.value
+
+  if (element) {
+    element.removeEventListener('scroll', scrollHandler)
+  }
+})
 /* 话题界面的页面宽度 */
 const topicPageWidth = computed(() => {
  return showKUNGalgamePageWidth.value.Topic + '%'
@ -112,7 +166,7 @@ onBeforeMount(() => {
      <Aside v-if="topicData?.tags" :tags="topicData.tags" />

      <!-- 内容区 -->
-      <div class="content">
+      <div class="content" ref="content">
        <Master v-if="topicData" :topicData="topicData" />
        <Reply v-if="repliesData" :repliesData="repliesData" />
      </div>
@ -133,7 +187,8 @@ onBeforeMount(() => {
 .content-container {
  width: v-bind(topicPageWidth);
  transition: all 0.2s;
-  height: 100%;
+  height: calc(100vh - 65px);
+  min-height: 500px;
  margin: 0 auto;
  display: flex;
  /* 设置背景的毛玻璃效果 */
@ -144,6 +199,7 @@ onBeforeMount(() => {
  border-radius: 5px;
  padding: 5px;
  box-sizing: border-box;
+  overflow: hidden;
 }

 /* 右侧内容区 */
@ -153,6 +209,8 @@ onBeforeMount(() => {
  /* 右侧内容区为弹性盒（用户可以一直向下滑） */
  display: flex;
  flex-direction: column;
+  overflow-y: scroll;
+  overflow-x: visible;
 }

@media (max-width: 1000px) {
--- a/src/views/topic/aside/Aside.vue
+++ b/src/views/topic/aside/Aside.vue
@ -61,8 +61,6 @@ watch(
 <style lang="scss" scoped>
 /* 侧边栏部分 */
 .aside {
-  top: 70px;
-  position: sticky;
  /* 侧边栏距离文章区域的距离 */
  margin-right: 5px;
  width: v-bind('asideWidth');
@ -77,6 +75,8 @@ watch(
  span {
    white-space: nowrap;
  }
+  overflow-y: scroll;
+  flex-shrink: 0;
 }
 /* 侧边栏交互 */
 .nav-aside {
--- a/src/views/topic/components/KUNGalgamerInfo.vue
+++ b/src/views/topic/components/KUNGalgamerInfo.vue
@ -67,7 +67,6 @@ const props = defineProps<{
    margin-top: 27px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--kungalgame-blue-1);
-    border-top: 1px solid var(--kungalgame-blue-1);
  }
  .info {
    margin-left: 50px;
--- a/src/views/topic/components/Master.vue
+++ b/src/views/topic/components/Master.vue
@ -97,6 +97,7 @@ const {
  align-items: center;
  /* 楼主话题距离其它人话题的距离 */
  margin-bottom: 5px;
+  flex-shrink: 0;
  /* TODO: */
  /* 楼主话题背景图 */
 }
--- a/src/views/topic/components/Reply.vue
+++ b/src/views/topic/components/Reply.vue
@ -26,8 +26,12 @@ defineProps<{

 <template>
  <!-- 其它人的回复 -->
-  <TransitionGroup class="trans-list" name="list" tag="div">
  <!-- 这里使用 Math.random 的原因是 key 必须唯一 -->
+  <Transition
+    enter-active-class="animate__animated animate__fadeInUp animate__faster"
+    appear
+  >
+    <div>
      <div
        class="other-topic-container"
        v-for="(reply, index) in repliesData"
@ -88,7 +92,8 @@ defineProps<{
          <Comments />
        </div>
      </div>
-  </TransitionGroup>
+    </div>
+  </Transition>
 </template>

 <style lang="scss" scoped>
@ -112,12 +117,11 @@ defineProps<{
  font-weight: bold;
  font-style: oblique;
  color: var(--kungalgame-red-3);
-  padding: 5px;
  border-bottom: none;
  /* 这里的阴影只能这么绘制 */
-  filter: drop-shadow(1px 2px 4px var(--kungalgame-trans-blue-4));
+  filter: drop-shadow(1px 2px 2px var(--kungalgame-trans-blue-4));
  span {
-    transform: rotate(10deg) translateY(10px) translateX(30px);
+    transform: rotate(10deg) translateY(40px);
    padding: 0 30px;
    text-align: center;
    background-color: var(--kungalgame-trans-white-2);
@ -193,25 +197,6 @@ defineProps<{
  color: var(--kungalgame-font-color-3);
 }

-.list-move, /* 对移动中的元素应用的过渡 */
-.list-enter-active,
-.list-leave-active {
-  transition: all 0.5s ease;
-}
-
-.list-enter-from,
-.list-leave-to {
-  opacity: 0;
-  transform: translateY(30px);
-}
-
-/* 确保将离开的元素从布局流中删除
-  以便能够正确地计算移动的动画。 */
-.list-leave-active {
-  transform: scale(0.5);
-  position: absolute;
-}
-
@media (max-width: 1000px) {
  .top {
    flex-direction: column;