feat(统计): 提交统计里鼠标停在提交方块上就能看到这次交的代码，不用再点开新页面

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

apps/web/src/oj/classroom/board.vue

@@ -13,8 +13,9 @@ import type { ClassBoard, ClassBoardCell, ClassBoardStudent } from "utils/types"
  * 学生一道都没交（占三分之一），交了 3 次以上还没过的平均不到 1 个。所以排序是
  * 没交过 → 卡住 → 在做 → 做完，没交过的名单还单独摆在最上面，老师扫一眼就能走过去。
  *
- * 班级**不记本地**，默认由后端猜最近两小时在交题的班 —— 理由见 StatisticsPanel.vue
- * 那段注释（上一节课的班悄悄留在框里，老师看的整个是别人的班）。
+ * 班级**不记本地**，默认由后端猜最近两小时在交题的班 —— 记本地的话，上一节课的班会
+ * 悄悄留在框里，老师看的整个是别人的班。（提交统计弹窗是记一小时的，见 composables/statisticsQuery.ts，
+ * 那边是老师自己手选的查询；这里后端本来就猜得出，没必要冒这个险。）
  */
 
 /** 同一道题今天交了这么多次还没过，算卡住 */

apps/web/src/shared/components/FlowchartStatisticsPanel.vue

@@ -142,9 +142,10 @@
 import { formatISO, sub, type Duration } from "date-fns"
 import type { FlowchartStatistics } from "@oj2/contract"
 import { getFlowchartStatistics } from "oj/api"
-import { PANEL_DURATION_OPTIONS, FLOWCHART_CRITERIA_ORDER } from "utils/constants"
+import { PANEL_DURATION_OPTIONS, FLOWCHART_CRITERIA_ORDER, STORAGE_KEY } from "utils/constants"
 import { durationFromValue } from "utils/functions"
 import { useHiddenStudents } from "../composables/hiddenStudents"
+import { useStatisticsQuery } from "../composables/statisticsQuery"
 import { Doughnut, Radar, Bar } from "vue-chartjs"
 import {
   Chart as ChartJS,
@@ -189,11 +190,8 @@ const message = useMessage()
 
 const durationOptions: SelectOption[] = [...PANEL_DURATION_OPTIONS]
 
-const query = reactive({
-  username: props.username,
-  problem: props.problem,
-  duration: durationOptions[0].value,
-})
+// 班级、题号、时间段记一小时，理由见 useStatisticsQuery
+const { query, save: saveQuery } = useStatisticsQuery(STORAGE_KEY.FLOWCHART_STATISTICS_QUERY, props)
 
 const data = reactive<FlowchartStatistics>({
   totalCount: 0,
@@ -447,6 +445,7 @@ async function handleStatistics() {
   try {
     const res = await getFlowchartStatistics(duration, query.problem, query.username)
     Object.assign(data, res)
+    saveQuery()
   } catch (error) {
     message.error("获取流程图统计失败")
     console.error("获取流程图统计失败:", error)

apps/web/src/shared/components/StatisticsPanel.vue

@@ -156,13 +156,14 @@
 <script setup lang="ts">
 import { h } from "vue"
 import { formatISO, sub, type Duration } from "date-fns"
-import { getSubmissionStatistics, getSubmissionStatisticsItems } from "oj/api"
-import { PANEL_DURATION_OPTIONS } from "utils/constants"
+import { getSubmission, getSubmissionStatistics, getSubmissionStatisticsItems } from "oj/api"
+import { LANGUAGE_FORMAT_VALUE, PANEL_DURATION_OPTIONS, STORAGE_KEY } from "utils/constants"
 import { useConfigStore } from "../store/config"
 import { useHiddenStudents } from "../composables/hiddenStudents"
+import { useStatisticsQuery } from "../composables/statisticsQuery"
 import { Doughnut } from "vue-chartjs"
 import { Chart as ChartJS, ArcElement, Title, Tooltip, Legend } from "chart.js"
-import { NFlex, NTag, NText, NTooltip, type DataTableRowKey } from "naive-ui"
+import { NCode, NFlex, NPopover, NTag, NText, type DataTableRowKey } from "naive-ui"
 import { JUDGE_STATUS, SubmissionStatus } from "utils/constants"
 import { durationFromValue, parseTime } from "utils/functions"
 import type {
@@ -242,6 +243,50 @@ function groupByProblem(list: SubmissionStatisticsItems["items"]) {
     .sort((a, b) => Number(a.solved) - Number(b.solved) || b.items.length - a.items.length)
 }
 
+/**
+ * 悬停方块时看到的代码，按提交编号缓存。
+ *
+ * 原来悬停只有「状态 · 时间 · 编号」，想看学生写了什么非得点开新页面，老师在一排
+ * 红方块之间来回对比时要开一堆标签页。代码**悬停时才拉**、不随明细一起下发：
+ * 明细一次最多 200 条、展开着每 15 秒还要重拉，而真正会被悬停的只是其中几个。
+ * 代码交了就不会再变，所以缓存不随重新统计清空（和 items 不一样）。
+ */
+type CodeState =
+  | { status: "loading" }
+  | { status: "error" }
+  | { status: "done"; code: string; language: string }
+
+const codes = reactive<Record<string, CodeState>>({})
+
+async function loadCode(id: string) {
+  const cached = codes[id]
+  if (cached && cached.status !== "error") return
+  codes[id] = { status: "loading" }
+  try {
+    const submission = await getSubmission(id)
+    codes[id] = {
+      status: "done",
+      code: submission.code,
+      language: LANGUAGE_FORMAT_VALUE[submission.language],
+    }
+  } catch {
+    codes[id] = { status: "error" }
+  }
+}
+
+function renderCode(id: string) {
+  const cached = codes[id]
+  if (!cached || cached.status === "loading") return h(NText, { depth: 3 }, () => "代码加载中…")
+  if (cached.status === "error")
+    return h(NText, { type: "error" }, () => "代码没拉下来，点方块打开看")
+  return h(
+    "div",
+    // 太长就在浮层里滚：鼠标移进浮层它不会消失，可以接着往下翻
+    { style: "max-height: 360px; overflow: auto" },
+    h(NCode, { code: cached.code, language: cached.language, showLineNumbers: true }),
+  )
+}
+
 function openSubmission(id: string) {
   window.open(`/submission/${id}`, "_blank", "noopener")
 }
@@ -288,8 +333,15 @@ const columns: DataTableColumn<SubmissionStatisticsUser>[] = [
             h(NFlex, { size: 4, wrap: true, style: "flex: 1; min-width: 0" }, () =>
               group.items.map((item) =>
                 h(
-                  NTooltip,
-                  { delay: 200 },
+                  NPopover,
+                  {
+                    delay: 200,
+                    // 代码比一行提示宽得多；限宽让长行在浮层里横向滚，不把浮层撑出屏幕
+                    style: "max-width: 560px",
+                    onUpdateShow: (show: boolean) => {
+                      if (show) loadCode(item.id)
+                    },
+                  },
                   {
                     trigger: () =>
                       h("button", {
@@ -310,9 +362,17 @@ const columns: DataTableColumn<SubmissionStatisticsUser>[] = [
                         },
                       }),
                     default: () =>
-                      `${JUDGE_STATUS[item.result]?.name ?? item.result} · ` +
-                      `${parseTime(item.createTime, "MM-DD HH:mm:ss")} · ` +
-                      `${item.id.toString().slice(0, 12)}`,
+                      h(NFlex, { vertical: true, size: "small" }, () => [
+                        h(
+                          NText,
+                          { depth: 3 },
+                          () =>
+                            `${JUDGE_STATUS[item.result]?.name ?? item.result} · ` +
+                            `${parseTime(item.createTime, "MM-DD HH:mm:ss")} · ` +
+                            `${item.id.toString().slice(0, 12)}`,
+                        ),
+                        renderCode(item.id),
+                      ]),
                   },
                 ),
               ),
@@ -385,19 +445,8 @@ const classOptions = computed<SelectOption[]>(
     })) ?? [],
 )
 
-/**
- * 班级/用户**不记本地**：这个选择框每次打开都从空的开始。
- *
- * 曾经把上次的班级写进 localStorage（statisticsClass），下次打开自动带上。但那正是
- * 最危险的地方 —— 下课换了班、或者换个人坐这台机器，上一个人查的班悄悄留在框里，
- * 老师没注意就按了「统计」，看到的整个是别人的班。宁可多选一次。
- * 登录框那份 LOGIN_CLASS 是另一回事：那记的是这台机器的身份，不是一次临时查询。
- */
-const query = reactive({
-  username: props.username,
-  problem: props.problem,
-  duration: options[0].value,
-})
+// 班级、题号、时间段记一小时，理由见 useStatisticsQuery
+const { query, save: saveQuery } = useStatisticsQuery(STORAGE_KEY.STATISTICS_QUERY, props)
 
 const count = reactive({
   total: 0,
@@ -675,6 +724,7 @@ async function fetchStatistics() {
     .map((item) => item.trim())
     .filter(Boolean)
   const res = await getSubmissionStatistics(duration, query.problem, query.username)
+  saveQuery()
   queriedProblemCount.value = new Set(problems.map((p) => p.toLowerCase())).size
   count.total = res.submissionCount
   count.accepted = res.acceptedCount

apps/web/src/shared/composables/statisticsQuery.ts

@@ -0,0 +1,65 @@
+import { reactive } from "vue"
+import { PANEL_DURATION_OPTIONS } from "utils/constants"
+import storage from "utils/storage"
+
+/**
+ * 统计面板的查询条件（班级/用户、题号、时间段），**记一小时**：一小时内再打开，
+ * 框里是上次查的那一组。
+ *
+ * 老师一节课里会反复开关这个弹窗（看一眼、关掉、走下去辅导、回来再开），每次都从空的
+ * 选班级、敲题号很烦。但也不能一直记着 —— 曾经把上次的班级永久写进 localStorage，
+ * 下课换了班、或者换个人坐这台机器，上一个人查的班悄悄留在框里，老师没注意就按了
+ * 「统计」，看到的整个是别人的班。一小时是折中：一节课够用，隔一节课就自己清掉。
+ * 注意**连堂**时下一节仍在一小时内，框里会是上一个班，这一点是接受了的。
+ *
+ * 一小时从「最后一次查询」算起（调用方在每次查完后调 `save`，自动刷新也算），
+ * 开着面板盯一整节课不会中途过期。
+ *
+ * 调用方传进来的初值优先：题目页固定是这道题、提交列表带着自己的筛选条件，
+ * 那是比缓存更明确的上下文；为空的那几项才用缓存补上。
+ * 登录框那份 LOGIN_CLASS 是另一回事：那记的是这台机器的身份，不是一次临时查询。
+ *
+ * @param storageKey localStorage 的键。**两个面板各用各的** —— 流程图题和代码题的
+ *   题号不是一批，互相带过去只会查出一片空。
+ */
+export function useStatisticsQuery(
+  storageKey: string,
+  initial: { username: string; problem: string },
+) {
+  const TTL = 60 * 60 * 1000
+
+  type Cached = { username: string; problem: string; duration: string; savedAt: number }
+
+  function load(): Partial<Cached> {
+    try {
+      const cached: Cached | null = storage.get(storageKey)
+      if (!cached || Date.now() - cached.savedAt > TTL) return {}
+      return cached
+    } catch {
+      return {}
+    }
+  }
+
+  const cached = load()
+
+  const query = reactive({
+    username: initial.username || cached.username || "",
+    problem: initial.problem || cached.problem || "",
+    // 选项表改过之后旧缓存里的值可能已经不在里面了，认不出来就回到第一档
+    duration: PANEL_DURATION_OPTIONS.some((option) => option.value === cached.duration)
+      ? cached.duration!
+      : PANEL_DURATION_OPTIONS[0].value,
+  })
+
+  function save() {
+    storage.set(storageKey, {
+      // 选择框点了清除是 null，不是空串
+      username: query.username ?? "",
+      problem: query.problem ?? "",
+      duration: query.duration,
+      savedAt: Date.now(),
+    } satisfies Cached)
+  }
+
+  return { query, save }
+}

apps/web/src/utils/constants.ts

@@ -156,6 +156,8 @@ export const STORAGE_KEY = {
   ADMIN_SIDER_COLLAPSED: "adminSiderCollapsed",
   DEMO_MODE: "demoMode",
   LOGIN_CLASS: "loginClass",
+  STATISTICS_QUERY: "statisticsQuery",
+  FLOWCHART_STATISTICS_QUERY: "flowchartStatisticsQuery",
 }
 
 export const DIFFICULTY = {