add:展台

Ink Canvas/MainWindow.xaml

@@ -4964,24 +4964,23 @@
                             </Border>
                             <Border Width="60" Height="50"
                                     BorderThickness="1" BorderBrush="{DynamicResource BoardFloatBarBorderBrush}"
-                                    MouseUp="BtnWhiteBoardAdd_Click" CornerRadius="5" Background="{DynamicResource BoardFloatBarBackground}"
+                                    MouseUp="BtnToggleVideoPresenter_Click"
+                                    CornerRadius="5"
+                                    Background="{DynamicResource BoardFloatBarBackground}"
                                     Opacity="1">
                                 <Grid Margin="6,6,6,4">
-                                    <Image VerticalAlignment="Top"
+                                    <Image
-                                           RenderOptions.BitmapScalingMode="HighQuality" Height="20" Width="20">
+                                        VerticalAlignment="Top"
-                                        <Image.Source>
+                                        RenderOptions.BitmapScalingMode="HighQuality"
-                                            <DrawingImage>
+                                        Height="20"
-                                                <DrawingImage.Drawing>
+                                        Width="20"
-                                                    <DrawingGroup ClipGeometry="M0,0 V24 H24 V0 H0 Z">
+                                        Source="/Resources/Icons-png/EasiCamera.png" />
-                                                        <GeometryDrawing Brush="{DynamicResource IconForeground}"
+                                    <TextBlock
-                                                                         Geometry="F0 M24,24z M0,0z M7.39778,13.723L10.7693,13.723 10.7693,10.3514 13.2307,10.3514 13.2307,13.723 16.6022,13.723 16.6022,16.1843 13.2307,16.1843 13.2307,19.5559 10.7693,19.5559 10.7693,16.1843 7.39778,16.1843 7.39778,13.723z M3.1391,1.17001L3.1391,22.83 20.8609,22.83 20.8609,6.66948 15.3614,1.17002 3.1391,1.17001z M12.9846,3.13911L5.10819,3.1391 5.10819,20.8609 18.8918,20.8609 18.8918,9.04638 12.9846,9.04638 12.9846,3.13911z M18.484,7.07729L14.9536,3.54692 14.9536,7.07729 18.484,7.07729z" />
+                                        Text="展台"
-                                                    </DrawingGroup>
+                                        Foreground="{DynamicResource FloatBarForeground}"
-                                                </DrawingImage.Drawing>
+                                        VerticalAlignment="Bottom"
-                                            </DrawingImage>
+                                        HorizontalAlignment="Center"
-                                        </Image.Source>
+                                        FontSize="12" />
-                                    </Image>
-                                    <TextBlock Text="新页面" Foreground="{DynamicResource FloatBarForeground}" VerticalAlignment="Bottom"
-                                               HorizontalAlignment="Center" FontSize="12" />
                                 </Grid>
                             </Border>
                         </ui:SimpleStackPanel>

Ink Canvas/MainWindow.xaml.cs

@@ -1481,6 +1481,24 @@ namespace Ink_Canvas
         {
             SystemEvents.DisplaySettingsChanged -= SystemEventsOnDisplaySettingsChanged;
 
+            try
+            {
+                // 清理视频展台资源
+                if (_cameraService != null)
+                {
+                    _cameraService.FrameReceived -= CameraService_FrameReceived;
+                    _cameraService.ErrorOccurred -= CameraService_ErrorOccurred;
+                    _cameraService.Dispose();
+                    _cameraService = null;
+                }
+                lock (_videoPresenterFrameLock)
+                {
+                    _lastFrame?.Dispose();
+                    _lastFrame = null;
+                }
+            }
+            catch { }
+
             // 释放PPT管理器资源
             DisposePPTManagers();
 

Ink Canvas/MainWindow_cs/MW_VideoPresenter.cs

@@ -46,6 +46,7 @@ namespace Ink_Canvas
 
             VideoPresenterSidebar.Visibility = Visibility.Visible;
             EnsureCameraService();
+            if (BtnCapturePhoto != null) BtnCapturePhoto.IsEnabled = false;
             RefreshVideoPresenterDeviceList();
 
             if (CheckBoxEnablePhotoCorrection != null)
@@ -86,16 +87,25 @@ namespace Ink_Canvas
 
             try
             {
-                Bitmap copy;
+                Bitmap serviceCopy;
+                try
+                {
+                    serviceCopy = (Bitmap)frame.Clone();
+                }
+                catch
+                {
+                    // 可能在下一帧到来时被 CameraService 释放，直接忽略这一帧
+                    return;
+                }
+
                 lock (_videoPresenterFrameLock)
                 {
                     _lastFrame?.Dispose();
-                    _lastFrame = (Bitmap)frame.Clone();
+                    _lastFrame = (Bitmap)serviceCopy.Clone();
-                    copy = (Bitmap)_lastFrame.Clone();
                 }
 
-                var preview = ConvertBitmapToBitmapImage(copy);
+                var preview = ConvertBitmapToBitmapImage(serviceCopy);
-                copy.Dispose();
+                serviceCopy.Dispose();
                 if (preview == null) return;
 
                 Dispatcher.BeginInvoke(new Action(() =>
@@ -154,6 +164,19 @@ namespace Ink_Canvas
                 rb.Checked += (s, e) => StartVideoPresenterPreview(idx);
                 CameraDevicesStackPanel.Children.Add(rb);
             }
+
+            // 自动启动第一个摄像头
+            if (_cameraService.AvailableCameras.Count > 0)
+            {
+                if (CameraDevicesStackPanel.Children.Count > 0 && CameraDevicesStackPanel.Children[0] is RadioButton first)
+                {
+                    first.IsChecked = true;
+                }
+                else
+                {
+                    StartVideoPresenterPreview(0);
+                }
+            }
         }
 
         private void StartVideoPresenterPreview(int cameraIndex)