feat：支持屏幕共享

playground/src/types/global.d.ts

@@ -4,6 +4,12 @@ interface Window {
   requests: any[]
   tokenRefreshing: boolean
   unique: number
+  /** teacher-electron 注入，仅在桌面客户端内嵌题库页时存在 */
+  teacherApi?: {
+    startSfu: () => Promise<{ port: number; already?: boolean }>
+    stopSfu: () => Promise<void>
+    openScreenShareWindow: () => Promise<void>
+  }
 }
 
 interface Option {

playground/src/views/org/classroom-monitor/home.vue

@@ -166,7 +166,10 @@ async function updateMonitorStatus(status: 0 | 1) {
   const option = status === 1 ? '开启' : '停止'
   controlLoading.value = true
   try {
-    await classroomMonitorService.updateMonitorStatus(selectedClass.value.id, status)
+    await classroomMonitorService.updateMonitorStatus(
+      selectedClass.value.id,
+      status,
+    )
     hud.success(`${option}监控成功`)
     await loadMonitorDetail(selectedClass.value.id)
   } finally {
@@ -206,10 +209,13 @@ async function loadSessions() {
   if (!selectedClass.value?.id) return
   sessionsLoading.value = true
   try {
-    const data = await classroomMonitorService.getSessions(selectedClass.value.id, {
+    const data = await classroomMonitorService.getSessions(
-      current: sessionsPage.current,
+      selectedClass.value.id,
-      size: sessionsPage.size,
+      {
-    })
+        current: sessionsPage.current,
+        size: sessionsPage.size,
+      },
+    )
     sessionsRows.value = data?.rows ?? []
     sessionsPage.total = data?.totalRows ?? 0
   } finally {
@@ -244,10 +250,27 @@ function formatTime(time?: number | string) {
   if (!time) return '-'
   const timestamp = Number(time)
   if (Number.isNaN(timestamp)) return String(time)
-  const date = new Date(String(timestamp).length === 10 ? timestamp * 1000 : timestamp)
+  const date = new Date(
+    String(timestamp).length === 10 ? timestamp * 1000 : timestamp,
+  )
   if (Number.isNaN(date.getTime())) return String(time)
   return date.toLocaleString()
 }
+
+/** teacher-electron 注入：打开独立屏幕共享窗口 */
+async function openTeacherScreenShareWindow() {
+  const api = window.teacherApi
+  if (!api?.openScreenShareWindow) {
+    ElMessage.warning('请在教师端桌面客户端中使用「共享屏幕」')
+    return
+  }
+  try {
+    await api.openScreenShareWindow()
+  } catch (e) {
+    console.error(e)
+    ElMessage.error('打开屏幕共享窗口失败')
+  }
+}
 </script>
 
 <template>
@@ -259,9 +282,18 @@ function formatTime(time?: number | string) {
             <div class="page-title">课堂监控</div>
             <div class="page-desc">请选择班级查看当前课堂监控。</div>
           </div>
-          <el-button :loading="classLoading" type="primary" @click="loadClassList">
+          <div class="header-actions">
-            刷新
+            <el-button type="primary" @click="openTeacherScreenShareWindow">
-          </el-button>
+              共享屏幕
+            </el-button>
+            <el-button
+              :loading="classLoading"
+              type="primary"
+              @click="loadClassList"
+            >
+              刷新
+            </el-button>
+          </div>
         </div>
       </template>
 
@@ -273,9 +305,7 @@ function formatTime(time?: number | string) {
               :type="item.monitorState === 1 ? 'success' : 'info'"
               size="small"
             >
-              {{
+              {{ item.monitorState === 1 ? '监控开启' : '监控关闭' }}
-                item.monitorState === 1 ? '监控开启' : '监控关闭'
-              }}
             </el-tag>
           </div>
           <el-button type="primary" @click="handleViewMonitor(item)">
@@ -283,7 +313,10 @@ function formatTime(time?: number | string) {
           </el-button>
         </div>
 
-        <el-empty v-if="!classLoading && classList.length === 0" description="暂无班级" />
+        <el-empty
+          v-if="!classLoading && classList.length === 0"
+          description="暂无班级"
+        />
       </div>
     </el-card>
 
@@ -297,6 +330,9 @@ function formatTime(time?: number | string) {
           <div class="header-actions">
             <el-button @click="backToClassList">返回班级列表</el-button>
             <el-button @click="openHistoryMonitor">历史监控</el-button>
+            <el-button type="primary" @click="openTeacherScreenShareWindow">
+              共享屏幕
+            </el-button>
             <el-button
               :loading="detailLoading || snapshotLoading"
               type="primary"
@@ -421,7 +457,11 @@ function formatTime(time?: number | string) {
           <el-table-column prop="intervalMs" label="采集间隔(ms)" width="120" />
           <el-table-column label="操作" width="88" fixed="right">
             <template #default="{ row }">
-              <el-button type="primary" link @click.stop="onSessionRowClick(row)">
+              <el-button
+                type="primary"
+                link
+                @click.stop="onSessionRowClick(row)"
+              >
                 查看
               </el-button>
             </template>
@@ -476,16 +516,11 @@ function formatTime(time?: number | string) {
               :preview-src-list="studentSnapshotPreviewList"
               :src="item.url"
             />
-            <div class="student-meta">
+            <div class="student-meta">截图时间：{{ formatTime(item.ts) }}</div>
-              截图时间：{{ formatTime(item.ts) }}
-            </div>
           </div>
         </div>
 
-        <el-empty
+        <el-empty v-else-if="!studentSnapshotLoading" description="暂无截图" />
-          v-else-if="!studentSnapshotLoading"
-          description="暂无截图"
-        />
       </div>
     </el-dialog>
   </div>
@@ -500,21 +535,21 @@ function formatTime(time?: number | string) {
 
   .card-header {
     display: flex;
+    gap: 16px;
     align-items: center;
     justify-content: space-between;
-    gap: 16px;
   }
 
   .page-title {
-    color: #1f2937;
     font-size: 20px;
     font-weight: 600;
+    color: #1f2937;
   }
 
   .page-desc {
     margin-top: 6px;
-    color: #6b7280;
     font-size: 14px;
+    color: #6b7280;
   }
 
   .header-actions {
@@ -540,16 +575,16 @@ function formatTime(time?: number | string) {
 
   .class-row-info {
     display: flex;
-    align-items: center;
-    gap: 12px;
     flex-wrap: wrap;
+    gap: 12px;
+    align-items: center;
     min-width: 0;
   }
 
   .class-name {
-    color: #111827;
     font-size: 16px;
     font-weight: 500;
+    color: #111827;
   }
 
   .monitor-detail {
@@ -558,8 +593,8 @@ function formatTime(time?: number | string) {
 
   .status-panel {
     display: flex;
-    align-items: center;
     gap: 24px;
+    align-items: center;
     padding: 16px;
     margin-bottom: 18px;
     background: #f8fafc;
@@ -568,19 +603,19 @@ function formatTime(time?: number | string) {
 
     > div {
       display: flex;
-      align-items: center;
       gap: 8px;
+      align-items: center;
     }
 
     strong {
-      color: #111827;
       font-weight: 600;
+      color: #111827;
     }
   }
 
   .status-label {
-    color: #6b7280;
     font-size: 14px;
+    color: #6b7280;
   }
 
   .snapshot-header {
@@ -591,21 +626,21 @@ function formatTime(time?: number | string) {
   }
 
   .section-title {
-    color: #111827;
     font-size: 16px;
     font-weight: 600;
+    color: #111827;
   }
 
   .snapshot-grid {
     display: grid;
-    min-height: 220px;
     grid-template-columns: repeat(4, minmax(0, 1fr));
     gap: 16px;
+    min-height: 220px;
   }
 
   .snapshot-card {
-    cursor: pointer;
     overflow: hidden;
+    cursor: pointer;
     transition:
       border-color 0.2s,
       box-shadow 0.2s;
@@ -637,14 +672,14 @@ function formatTime(time?: number | string) {
   }
 
   .student-name {
-    color: #111827;
     font-weight: 600;
+    color: #111827;
   }
 
   .student-meta {
     margin-top: 4px;
-    color: #6b7280;
     font-size: 12px;
+    color: #6b7280;
   }
 
   .student-snapshot-dialog {
@@ -653,8 +688,8 @@ function formatTime(time?: number | string) {
 
   .student-snapshot-summary {
     display: flex;
-    align-items: center;
     gap: 12px;
+    align-items: center;
     padding-bottom: 16px;
     margin-bottom: 16px;
     border-bottom: 1px solid #edf0f5;
@@ -681,14 +716,14 @@ function formatTime(time?: number | string) {
   }
 
   .sessions-table {
-    cursor: pointer;
     width: 100%;
+    cursor: pointer;
   }
 
   .sessions-pagination {
-    margin-top: 16px;
     display: flex;
     justify-content: flex-end;
+    margin-top: 16px;
   }
 }
 
@@ -711,8 +746,8 @@ function formatTime(time?: number | string) {
     }
 
     .status-panel {
-      align-items: flex-start;
       flex-direction: column;
+      align-items: flex-start;
     }
   }
 }
@@ -722,8 +757,8 @@ function formatTime(time?: number | string) {
     .card-header,
     .class-row,
     .snapshot-header {
-      align-items: stretch;
       flex-direction: column;
+      align-items: stretch;
     }
 
     .header-actions {