fix: stabilize task review preview scrolling

src/views/teacherEnd/score/TaskReviewPanel.vue

@@ -80,6 +80,7 @@
             :key="studentPreviewSrc"
             class="task-review__student-preview"
             :src="studentPreviewSrc"
+            :style="{ height: `${previewFrameHeight}px` }"
             scrolling="yes"
             title="学生任务页面只读预览"
           />
@@ -129,7 +130,9 @@ const studentTableRef = ref();
 const previewKey = ref("");
 const studentPreviewSrc = ref("");
 const studentPreviewError = ref("");
+const previewFrameHeight = ref(580);
 let previewRequestVersion = 0;
+const PREVIEW_HEIGHT_MESSAGE = "teacher-task-review-preview-height";
 
 const canManageClass = computed(() => {
   const currentClass = teachingClasses.value.find((item) => item.schoolClassId === filters.value.classId);
@@ -159,6 +162,7 @@ async function refreshStudentPreview() {
   const teachingClassId = filters.value.classId;
   const student = selectedStudent.value;
   studentPreviewError.value = "";
+  previewFrameHeight.value = 580;
   if (!student || !taskKey || !teachingClassId) {
     previewKey.value = "";
     studentPreviewSrc.value = "";
@@ -235,6 +239,13 @@ function selectStudent(row) {
 function studentRowClass({ row }) {
   return row.studentUserId === selectedStudentId.value ? "task-review__selected-row" : "";
 }
+function onPreviewMessage(event) {
+  if (event.origin !== window.location.origin) return;
+  const data = event.data || {};
+  if (data.type !== PREVIEW_HEIGHT_MESSAGE || data.previewKey !== previewKey.value) return;
+  const height = Number(data.height);
+  if (Number.isFinite(height) && height > 0) previewFrameHeight.value = Math.max(580, Math.ceil(height));
+}
 async function saveSingleScore(row) {
   const score = row.teacherScoreDraft;
   if (!Number.isInteger(score) || score < 0 || score > 100) {
@@ -270,8 +281,14 @@ async function saveBatchScore() {
     savingBatch.value = false;
   }
 }
-onMounted(loadTeachingClasses);
+onMounted(() => {
-onBeforeUnmount(() => clearTrainingReviewPreview(previewKey.value));
+  window.addEventListener("message", onPreviewMessage);
+  loadTeachingClasses();
+});
+onBeforeUnmount(() => {
+  window.removeEventListener("message", onPreviewMessage);
+  clearTrainingReviewPreview(previewKey.value);
+});
 </script>
 
 <style lang="scss" scoped>
@@ -293,8 +310,11 @@ onBeforeUnmount(() => clearTrainingReviewPreview(previewKey.value));
 .task-review__scores { display: flex; gap: 10px; color: #b9d9eb; font-size: 13px; white-space: nowrap; }
 .task-review__scores span { padding: 7px 10px; border: 1px solid rgba(50, 166, 223, 0.28); border-radius: 999px; background: rgba(2, 26, 43, 0.68); }
 .task-review__scores strong { margin-left: 5px; color: #77d9ff; font-size: 17px; }
-.task-review__student-preview-scroll { height: calc(100vh - 260px); min-height: 580px; margin-top: 22px; overflow: auto; border: 1px solid rgba(54, 159, 212, 0.32); border-radius: 10px; }
+.task-review__student-preview-scroll { height: calc(100vh - 260px); min-height: 580px; margin-top: 22px; overflow: scroll; scrollbar-gutter: stable; scrollbar-color: #238db8 #061724; border: 1px solid rgba(54, 159, 212, 0.32); border-radius: 10px; }
-.task-review__student-preview { display: block; width: 100%; min-width: 1280px; height: 100%; min-height: 580px; border: 0; }
+.task-review__student-preview-scroll::-webkit-scrollbar { width: 12px; height: 12px; }
+.task-review__student-preview-scroll::-webkit-scrollbar-track { background: #061724; }
+.task-review__student-preview-scroll::-webkit-scrollbar-thumb { border: 2px solid #061724; border-radius: 8px; background: #238db8; }
+.task-review__student-preview { display: block; width: 100%; min-width: 1280px; min-height: 580px; border: 0; }
 .task-review__batch-copy { margin: 0 0 18px; color: #dff6ff; }
 .task-review__batch-input { width: 100%; }
 :deep(.task-review__selected-row > td) { background: rgba(0, 111, 177, 0.26) !important; }

src/views/teacherEnd/taskReview/StudentTaskReadonlyPreview.vue

@@ -1,5 +1,5 @@
 <template>
-  <main class="student-task-readonly-preview" @click.capture="guardPreviewInteraction" @keydown.capture="guardPreviewInteraction">
+  <main ref="previewRoot" class="student-task-readonly-preview" @click.capture="guardPreviewInteraction" @keydown.capture="guardPreviewInteraction">
     <component v-if="previewComponent" :is="previewComponent" v-bind="previewProps" />
     <el-empty v-else :description="emptyDescription" :image-size="112" />
   </main>
@@ -13,6 +13,11 @@ const route = useRoute();
 const previewComponent = shallowRef(null);
 const previewProps = ref({});
 const emptyDescription = ref("正在加载学生任务页面");
+const previewRoot = ref();
+const PREVIEW_HEIGHT_MESSAGE = "teacher-task-review-preview-height";
+let resizeObserver;
+let mutationObserver;
+let animationFrame;
 
 async function loadPreview() {
   previewComponent.value = null;
@@ -30,6 +35,8 @@ async function loadPreview() {
   try {
     previewComponent.value = (await loader()).default;
     previewProps.value = studentTaskPreviewPropsByKey[taskKey]?.(taskKey) || {};
+    await nextTick();
+    schedulePreviewHeight();
   } catch (_) {
     emptyDescription.value = "学生任务页面加载失败，请刷新后重试";
   }
@@ -37,6 +44,40 @@ async function loadPreview() {
 
 watch(() => [route.query.taskKey, route.query.reviewPreviewKey], loadPreview, { immediate: true });
 
+onMounted(() => {
+  resizeObserver = new ResizeObserver(schedulePreviewHeight);
+  if (previewRoot.value) resizeObserver.observe(previewRoot.value);
+  mutationObserver = new MutationObserver(schedulePreviewHeight);
+  if (previewRoot.value) mutationObserver.observe(previewRoot.value, { childList: true, subtree: true });
+  schedulePreviewHeight();
+});
+
+onBeforeUnmount(() => {
+  resizeObserver?.disconnect();
+  mutationObserver?.disconnect();
+  if (animationFrame) cancelAnimationFrame(animationFrame);
+});
+
+function schedulePreviewHeight() {
+  if (animationFrame) cancelAnimationFrame(animationFrame);
+  animationFrame = requestAnimationFrame(reportPreviewHeight);
+}
+
+function reportPreviewHeight() {
+  animationFrame = 0;
+  const height = Math.ceil(Math.max(
+    previewRoot.value?.scrollHeight || 0,
+    document.body?.scrollHeight || 0,
+    document.documentElement?.scrollHeight || 0,
+    window.innerHeight || 0,
+  ));
+  window.parent?.postMessage({
+    type: PREVIEW_HEIGHT_MESSAGE,
+    previewKey: String(route.query.reviewPreviewKey || ""),
+    height,
+  }, window.location.origin);
+}
+
 function guardPreviewInteraction(event) {
   const target = event.target instanceof Element ? event.target : null;
   if (!target) return;
@@ -59,3 +100,9 @@ function isStepNavigation(element) {
   return /(上一步|下一步|第\s*\d+\s*步|切换.*步骤|步骤.*切换)/.test(text);
 }
 </script>
+
+<style lang="scss" scoped>
+.student-task-readonly-preview :deep(.training-ai-sidebar),
+.student-task-readonly-preview :deep(.training-ai-evaluation) { display: none !important; }
+.student-task-readonly-preview :deep(.student-training-shell) { grid-template-columns: minmax(0, 1fr) !important; }
+</style>

tests/task-review-preview.test.mjs

@@ -45,6 +45,10 @@ assert.match(previewShell, /function guardPreviewInteraction/);
 assert.match(previewShell, /getAttribute\("aria-label"\)/);
 assert.doesNotMatch(previewShell, /:global\(html\)|:global\(body\)/, "预览壳不得改写学生页面的全局样式");
 assert.doesNotMatch(previewShell, /pointer-events\s*:/, "预览壳不得用样式禁用学生页面控件");
+assert.match(previewShell, /training-ai-sidebar/, "评阅预览应隐藏 AI 助学");
+assert.match(previewShell, /training-ai-evaluation/, "评阅预览应隐藏 AI 助评");
+assert.match(previewShell, /teacher-task-review-preview-height/, "预览页应向外层同步内容高度");
+assert.match(previewShell, /ResizeObserver/, "预览页内容变化后应重新同步高度");
 assert.match(reviewPanel, /writeTrainingReviewPreview/);
 assert.match(reviewPanel, /listClassTrainingTasks\(filters\.value\.classId/);
 assert.match(reviewPanel, /find\(\(task\) => task\.taskKey === taskKey\)/);
@@ -55,6 +59,9 @@ assert.match(reviewPanel, /class="task-review__student-preview-scroll"/);
 assert.match(reviewPanel, /<iframe[^>]+studentPreviewSrc/);
 assert.match(reviewPanel, /scrolling="yes"/);
 assert.match(reviewPanel, /min-width:\s*1280px/, "嵌入学生页面应保留桌面端视口，窄区域改为滚动查看");
+assert.match(reviewPanel, /previewFrameHeight/, "外层应使用嵌入页同步的真实高度");
+assert.match(reviewPanel, /teacher-task-review-preview-height/, "外层应接收预览内容高度");
+assert.match(reviewPanel, /overflow:\s*scroll/, "外层预览应始终显示滚动轨道");
 assert.match(reviewPanel, /grid-template-columns: minmax\(360px, 400px\) minmax\(0, 1fr\)/);
 assert.match(reviewPanel, /class="task-review__student-table"/);
 assert.match(reviewPanel, /type="selection" width="38"/);