feat(公告): 公告页改成左边列表、右边全文，不用再一条条点开弹框；首页（学生和老师）的公告卡片点一条直接打开那一条，老师首页也改成最新三条

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/web/src/oj/announcement/list.vue

@@ -1,84 +1,151 @@
-<script lang="ts" setup>
+<script setup lang="ts">
 import { useThemeVars } from "naive-ui"
 import { getAnnouncement, getAnnouncementList } from "oj/api"
-import Pagination from "shared/components/Pagination.vue"
+import NotFound from "shared/components/NotFound.vue"
 import { useBreakpoints } from "shared/composables/breakpoints"
-import { parseTime } from "utils/functions"
-import type { AnnouncementListItem } from "utils/types"
-import TitleWithTag from "./components/TitleWithTag.vue"
+import { errorCode } from "utils/api"
+import { parseTime, zonedParts, zonedYear } from "utils/functions"
+import type { Announcement, AnnouncementListItem } from "utils/types"
 
-const total = ref(0)
-const content = ref("")
-const title = ref("")
-const [show, toggleShow] = useToggle(false)
+/**
+ * 公告：左边列表、右边全文，和后台 AI 报告一个排法。原来是一张四列的表、正文开弹框 ——
+ * 「发布人」一列 24 条全是同一个人，弹框又让人一条条点开再关。
+ * 选中哪条写在地址的 ?id= 上，首页的公告卡片直接链到这里那一条。
+ * 手机上放不下两栏：没带 id 只列表，带了 id 只全文、顶上一个「全部公告」回去。
+ * 一共才二十几条（四年 24 条），一次拉全，不分页
+ */
+const LIMIT = 100
 
-const { isDesktop } = useBreakpoints()
 const theme = useThemeVars()
+const route = useRoute()
+const router = useRouter()
+const { isDesktop } = useBreakpoints()
 
-const query = reactive({
-  limit: 10,
-  page: 1,
-})
-
-async function showContent(announcement: AnnouncementListItem) {
-  const res = await getAnnouncement(announcement.id)
-  toggleShow(true)
-  title.value = announcement.title
-  content.value = res.content
-}
 const announcements = ref<AnnouncementListItem[]>([])
 const loaded = ref(false)
 
-async function listAnnouncements() {
-  const offset = (query.page - 1) * query.limit
-  const res = await getAnnouncementList(offset, query.limit)
-  total.value = res.total
+onMounted(async () => {
+  const res = await getAnnouncementList(0, LIMIT)
   announcements.value = res.results
   loaded.value = true
+})
+
+const queryId = computed(() => {
+  const id = Number(route.query.id)
+  return Number.isInteger(id) && id > 0 ? id : null
+})
+
+/** 桌面上没带 id 就看第一条（置顶的排最前）；手机上没带 id 就只看列表 */
+const selectedId = computed(
+  () => queryId.value ?? (isDesktop.value ? (announcements.value[0]?.id ?? null) : null),
+)
+
+function select(id: number) {
+  router.replace({ query: { ...route.query, id } })
 }
 
-onMounted(listAnnouncements)
-watch(query, listAnnouncements, { deep: true })
+function backToList() {
+  const { id: _, ...rest } = route.query
+  router.replace({ query: rest })
+}
+
+const detail = ref<Announcement | null>(null)
+const detailState = ref<"idle" | "loading" | "ok" | "missing" | "failed">("idle")
+let seq = 0
+
+async function loadDetail(id: number | null) {
+  const mine = ++seq
+  if (id === null) {
+    detail.value = null
+    detailState.value = "idle"
+    return
+  }
+  detailState.value = "loading"
+  try {
+    const res = await getAnnouncement(id)
+    if (mine !== seq) return
+    detail.value = res
+    detailState.value = "ok"
+  } catch (err) {
+    if (mine !== seq) return
+    detail.value = null
+    detailState.value = errorCode(err) === "announcement-not-found" ? "missing" : "failed"
+  }
+}
+
+watch(selectedId, loadDetail, { immediate: true })
+
+function dateText(value: string) {
+  return parseTime(value, zonedParts(value)!.year === zonedYear() ? "M月D日" : "YYYY年M月D日")
+}
+
+/** 「2026年9月19日发布 · 9月23日改过」：同一天改的不写 */
+function metaText(item: Announcement) {
+  const created = parseTime(item.createTime, "YYYY年M月D日")
+  const updated = parseTime(item.lastUpdateTime, "YYYY年M月D日")
+  return updated === created
+    ? `${created}发布`
+    : `${created}发布 · ${dateText(item.lastUpdateTime)}改过`
+}
+
+const showList = computed(() => isDesktop.value || queryId.value === null)
+const showReader = computed(() => isDesktop.value || queryId.value !== null)
 </script>
+
 <template>
   <div class="page oj-page">
     <h2>公告</h2>
-    <div class="table">
-      <div class="tr th">
-        <span>公告标题</span>
-        <span>标签</span>
-        <span>发布时间</span>
-        <span>发布人</span>
-      </div>
-      <div
-        v-for="row in announcements"
-        :key="row.id"
-        class="tr"
-        role="link"
-        tabindex="0"
-        @click="showContent(row)"
-        @keyup.enter="showContent(row)"
+
+    <n-empty v-if="loaded && !announcements.length" description="还没有公告" class="blank" />
+
+    <div v-else class="layout">
+      <div v-if="showList" class="list">
+        <button
+          v-for="item in announcements"
+          :key="item.id"
+          type="button"
+          class="item"
+          :class="{ on: isDesktop && item.id === selectedId }"
+          @click="select(item.id)"
         >
-        <TitleWithTag :title="row.title" :top="row.top" />
-        <span
-          ><n-tag size="small">{{ row.tag || "公告" }}</n-tag></span
-        >
-        <span class="muted num">{{ parseTime(row.createTime) }}</span>
-        <span class="muted">{{ row.createdBy.username }}</span>
+          <span class="item-title">
+            <n-tag v-if="item.top" type="warning" size="small" :bordered="false">置顶</n-tag>
+            <span class="ellipsis">{{ item.title }}</span>
+          </span>
+          <span class="muted num">{{ item.tag || "公告" }} · {{ dateText(item.createTime) }}</span>
+        </button>
       </div>
-      <div v-if="loaded && !announcements.length" class="empty muted">还没有公告</div>
+
+      <article v-if="showReader" class="reader">
+        <a v-if="!isDesktop" class="back" @click="backToList">‹ 全部公告</a>
+        <NotFound
+          v-if="detailState === 'missing'"
+          title="这条公告不存在"
+          hint="可能已经撤下了"
+          to="/announcement"
+          to-label="看全部公告"
+        />
+        <NotFound v-else-if="detailState === 'failed'" icon="ph:wifi-slash" title="公告没拉下来">
+          <n-button type="primary" @click="loadDetail(selectedId)">再试一次</n-button>
+        </NotFound>
+        <n-spin v-else :show="detailState === 'loading'">
+          <template v-if="detail">
+            <header class="reader-head">
+              <h3>
+                <n-tag v-if="detail.top" type="warning" size="small" :bordered="false">
+                  置顶
+                </n-tag>
+                {{ detail.title }}
+              </h3>
+              <span class="muted num">{{ detail.tag || "公告" }} · {{ metaText(detail) }}</span>
+            </header>
+            <div class="content" v-html="detail.content"></div>
+          </template>
+          <div v-else class="placeholder"></div>
+        </n-spin>
+      </article>
     </div>
-    <Pagination v-model:limit="query.limit" v-model:page="query.page" :total="total" />
   </div>
-  <n-modal
-    v-model:show="show"
-    preset="card"
-    :style="{ maxWidth: isDesktop && '70vw', maxHeight: '80vh' }"
-    :content-style="{ overflow: 'auto' }"
-    :title="title"
-  >
-    <div v-html="content"></div>
-  </n-modal>
 </template>
 
 <style scoped>
@@ -93,7 +160,69 @@ h2 {
   font-size: var(--oj-fs-title);
 }
 
+.blank {
+  margin-top: 60px;
+}
+
+.layout {
+  display: flex;
+  gap: var(--oj-gap);
+  align-items: flex-start;
+}
+
+.list {
+  width: 340px;
+  flex: none;
+  border: 1px solid v-bind("theme.dividerColor");
+  border-radius: var(--oj-radius);
+  overflow: hidden;
+}
+
+.item {
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+  width: 100%;
+  padding: 12px 16px;
+  border: 0;
+  border-bottom: 1px solid v-bind("theme.dividerColor");
+  background: none;
+  font: inherit;
+  text-align: left;
+  color: inherit;
+  cursor: pointer;
+}
+
+.item:last-child {
+  border-bottom: 0;
+}
+
+.item:hover {
+  background: v-bind("theme.hoverColor");
+}
+
+.item.on {
+  background: v-bind("theme.hoverColor");
+  box-shadow: inset 3px 0 0 v-bind("theme.primaryColor");
+}
+
+.item-title {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  min-width: 0;
+  font-size: var(--oj-fs-body);
+}
+
+.ellipsis {
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
 .muted {
+  font-size: var(--oj-fs-sec);
   color: v-bind("theme.textColor3");
 }
 
@@ -101,56 +230,70 @@ h2 {
   font-variant-numeric: tabular-nums;
 }
 
-.table {
-  border: 1px solid v-bind("theme.borderColor");
+.reader {
+  flex: 1 1 auto;
+  min-width: 0;
+  padding: 20px var(--oj-pad-x) 28px;
   border-radius: var(--oj-radius);
-  overflow: hidden;
+  background: v-bind("theme.actionColor");
 }
 
-.tr {
-  display: grid;
-  grid-template-columns: minmax(200px, 1fr) 80px 170px 120px;
-  align-items: center;
-  gap: 14px;
-  min-height: var(--oj-row-h-roomy);
-  padding: 0 var(--oj-pad-x);
-  font-size: var(--oj-fs-body);
-  border-bottom: 1px solid v-bind("theme.dividerColor");
+.back {
+  display: inline-block;
+  margin-bottom: 12px;
+  font-size: var(--oj-fs-sec);
+  color: v-bind("theme.textColor3");
   cursor: pointer;
 }
 
-.tr > .muted {
-  font-size: var(--oj-fs-sec);
+.reader-head {
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+  padding-bottom: 14px;
+  border-bottom: 1px solid v-bind("theme.dividerColor");
 }
 
-.tr:last-child {
-  border-bottom: 0;
+h3 {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  margin: 0;
+  font-size: 20px;
 }
 
-.tr:not(.th):hover {
-  background: v-bind("theme.hoverColor");
+/* 正文是后台富文本编辑器存的 HTML，和题面一样 16px，别缩 */
+.content {
+  padding-top: 14px;
+  font-size: 16px;
+  line-height: 1.8;
+  overflow-wrap: anywhere;
 }
 
-.th {
-  min-height: var(--oj-head-h);
-  font-size: var(--oj-fs-meta);
-  color: v-bind("theme.textColor3");
-  background: v-bind("theme.actionColor");
-  cursor: default;
+.content :deep(p) {
+  margin: 0 0 8px;
 }
 
-.empty {
-  padding: 32px var(--oj-pad-x);
+.content :deep(img) {
+  max-width: 100%;
+  height: auto;
 }
 
-@media (max-width: 760px) {
-  .tr {
-    grid-template-columns: 1fr auto;
+.content :deep(a) {
+  color: v-bind("theme.primaryColor");
 }
 
-  .tr > :nth-child(2),
-  .tr > :nth-child(4) {
-    display: none;
+.placeholder {
+  min-height: 240px;
+}
+
+@media (max-width: 768px) {
+  .list {
+    width: 100%;
+  }
+
+  .reader {
+    padding: 16px;
   }
 }
 </style>

apps/web/src/oj/home/TeacherHome.vue

@@ -2,38 +2,37 @@
 import type { ClassToday } from "@oj2/contract"
 import type { AnnouncementListItem } from "utils/types"
 import { useThemeVars } from "naive-ui"
-import { getAnnouncement, getAnnouncementList, getClassToday } from "oj/api"
+import { getAnnouncementList, getClassToday } from "oj/api"
 import { classLabel } from "oj/submission/utils"
 import { useUserStore } from "shared/store/user"
-import { parseTime, zonedParts } from "utils/functions"
+import { parseTime, zonedParts, zonedYear } from "utils/functions"
 
 /**
  * 老师的首页（设计稿「首页重设计」HomeTeacher）。原来老师看到的和学生一样（继续学习、最近提交），
  * 对老师没用。现在最上面是「今天的课」：今天在上课的每个班一行 —— 正在上课 / 几点下课了、
  * 布置了几道、几人交过、全做对几人，每道题一根小条，点「课堂看板」进那个班。
- * 下面是常用入口和置顶的公告
+ * 下面是常用入口和最新三条公告（和学生首页一样，置顶的排最前）
  */
 const theme = useThemeVars()
 const router = useRouter()
 const userStore = useUserStore()
 
 const today = ref<ClassToday | null>(null)
-const pinned = ref<AnnouncementListItem[]>([])
+const announcements = ref<AnnouncementListItem[]>([])
 
 /** 最后一次有人交题在这么久以内，算「正在上课」 */
 const LIVE_MS = 15 * 60 * 1000
 
 onMounted(async () => {
-  const [classes, announcements] = await Promise.allSettled([
-    getClassToday(),
-    getAnnouncementList(0, 10),
-  ])
+  const [classes, latest] = await Promise.allSettled([getClassToday(), getAnnouncementList(0, 3)])
   if (classes.status === "fulfilled") today.value = classes.value
-  if (announcements.status === "fulfilled") {
-    pinned.value = announcements.value.results.filter((item) => item.top)
-  }
+  if (latest.status === "fulfilled") announcements.value = latest.value.results
 })
 
+function dateText(value: string) {
+  return parseTime(value, zonedParts(value)!.year === zonedYear() ? "M月D日" : "YYYY年M月D日")
+}
+
 const greeting = computed(() => {
   const hour = zonedParts(new Date())!.hour
   if (hour < 5) return "夜深了"
@@ -74,16 +73,6 @@ const shortcuts = computed(() =>
     { label: "后台", to: userStore.isSuperAdmin ? "/admin" : "/admin/problem/list", show: true },
   ].filter((it) => it.show),
 )
-
-const announcementShow = ref(false)
-const announcementTitle = ref("")
-const announcementContent = ref("")
-async function openAnnouncement(item: AnnouncementListItem) {
-  const res = await getAnnouncement(item.id)
-  announcementTitle.value = item.title
-  announcementContent.value = res.content
-  announcementShow.value = true
-}
 </script>
 
 <template>
@@ -141,30 +130,23 @@ async function openAnnouncement(item: AnnouncementListItem) {
       </n-button>
     </div>
 
-    <div
-      v-for="item in pinned"
-      :key="item.id"
-      class="card pinned"
-      role="button"
-      tabindex="0"
-      @click="openAnnouncement(item)"
-      @keyup.enter="openAnnouncement(item)"
-    >
-      <n-tag type="warning" size="small" :bordered="false">置顶</n-tag>
-      <b>{{ item.title }}</b>
+    <section v-if="announcements.length" class="card">
+      <div class="card-head">
+        <h3>公告</h3>
         <span class="spacer"></span>
-      <router-link to="/announcement" class="muted" @click.stop>公告 →</router-link>
+        <router-link to="/announcement" class="muted">全部</router-link>
       </div>
-
-    <n-modal
-      v-model:show="announcementShow"
-      preset="card"
-      :style="{ maxWidth: '70vw', maxHeight: '80vh' }"
-      :content-style="{ overflow: 'auto' }"
-      :title="announcementTitle"
+      <router-link
+        v-for="item in announcements"
+        :key="item.id"
+        :to="{ path: '/announcement', query: { id: item.id } }"
+        class="ann-row"
       >
-      <div v-html="announcementContent"></div>
-    </n-modal>
+        <n-tag v-if="item.top" type="warning" size="small" :bordered="false">置顶</n-tag>
+        <span class="ann-title">{{ item.title }}</span>
+        <span class="muted num">{{ dateText(item.createTime) }}</span>
+      </router-link>
+    </section>
   </div>
 </template>
 
@@ -299,15 +281,36 @@ async function openAnnouncement(item: AnnouncementListItem) {
   gap: 10px;
 }
 
-.pinned {
-  flex-direction: row;
-  align-items: center;
-  gap: 10px;
-  padding: 14px 18px;
-  cursor: pointer;
+.card-head {
+  display: flex;
+  align-items: baseline;
 }
 
-.pinned:hover {
-  border-color: v-bind("theme.primaryColor");
+.ann-row {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  min-height: 46px;
+  padding: 0 6px;
+  border-top: 1px solid v-bind("theme.dividerColor");
+  border-radius: 4px;
+  color: inherit;
+  text-decoration: none;
+}
+
+.ann-row:first-of-type {
+  border-top: 0;
+}
+
+.ann-row:hover {
+  background: v-bind("theme.hoverColor");
+}
+
+.ann-title {
+  flex: 1;
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
 }
 </style>

apps/web/src/oj/home/dashboard.vue

@@ -2,7 +2,6 @@
 import { continueStep, doneCount, lessonPath, splitTitle, type TutorialType } from "oj/learn/lesson"
 import { Icon } from "@iconify/vue"
 import {
-  getAnnouncement,
   getAnnouncementList,
   getClassActivity,
   getKnowledgeMap,
@@ -14,7 +13,6 @@ import {
   getWeeklyRank,
 } from "oj/api"
 import SubmissionResultTag from "shared/components/SubmissionResultTag.vue"
-import { useBreakpoints } from "shared/composables/breakpoints"
 import { pickHeadline, type Headline } from "oj/user/knowledge"
 import { useUserStore } from "shared/store/user"
 import { ContestStatus, CONTEST_STATUS, JUDGE_STATUS, LANGUAGE_SHOW_VALUE } from "utils/constants"
@@ -43,7 +41,6 @@ interface Track {
 
 const router = useRouter()
 const userStore = useUserStore()
-const { isDesktop } = useBreakpoints()
 
 const tracks = ref<Track[]>([])
 const contests = ref<Contest[]>([])
@@ -313,17 +310,6 @@ function contestTime(contest: Contest) {
   }
   return `${parseTime(contest.startTime, "M月D日 HH:mm")} 开始 · 时长 ${duration(contest.startTime, contest.endTime)}`
 }
-
-const announcementShow = ref(false)
-const announcementTitle = ref("")
-const announcementContent = ref("")
-
-async function openAnnouncement(item: AnnouncementListItem) {
-  const res = await getAnnouncement(item.id)
-  announcementTitle.value = item.title
-  announcementContent.value = res.content
-  announcementShow.value = true
-}
 </script>
 
 <template>
@@ -528,32 +514,19 @@ async function openAnnouncement(item: AnnouncementListItem) {
           <template #header-extra>
             <router-link to="/announcement" class="more">全部</router-link>
           </template>
-          <div
+          <router-link
             v-for="item in announcements"
             :key="item.id"
-            class="row clickable"
-            role="button"
-            tabindex="0"
-            @click="openAnnouncement(item)"
-            @keyup.enter="openAnnouncement(item)"
+            :to="{ path: '/announcement', query: { id: item.id } }"
+            class="row"
           >
             <n-tag v-if="item.top" type="warning" size="small" :bordered="false">置顶</n-tag>
             <span class="row-title">{{ item.title }}</span>
             <n-text depth="3" class="row-meta">{{ dateText(item.createTime) }}</n-text>
-          </div>
+          </router-link>
         </n-card>
       </div>
     </div>
-
-    <n-modal
-      v-model:show="announcementShow"
-      preset="card"
-      :style="{ maxWidth: isDesktop ? '70vw' : undefined, maxHeight: '80vh' }"
-      :content-style="{ overflow: 'auto' }"
-      :title="announcementTitle"
-    >
-      <div v-html="announcementContent"></div>
-    </n-modal>
   </div>
 </template>