fix:issue #219

Ink Canvas/MainWindow.xaml

@@ -1467,8 +1467,8 @@
                                     <Border ClipToBounds="True" Width="324" Height="182">
                                         <Grid>
                                             <Image Source="Resources/PresentationExample/page.jpg" Width="324" Height="182" Stretch="Fill"></Image>
-                                            <Image Source="Resources/PresentationExample/toolbar.png" Height="16" Width="324"
+                                            <Image Name="PPTBtnPreviewToolbar" Source="Resources/PresentationExample/toolbar.png" Height="16" Width="324"
-                                                   VerticalAlignment="Bottom" HorizontalAlignment="Center" Stretch="Fill" />
+                                                   VerticalAlignment="Bottom" HorizontalAlignment="Center" Stretch="Uniform" />
                                             <Image Name="PPTBtnPreviewLS" Source="Resources/PresentationExample/sidebar-white.png" Width="10" Height="30"
                                                    VerticalAlignment="Center" HorizontalAlignment="Left" RenderTransformOrigin="0.5,0.5" Stretch="Fill">
                                                 <Image.RenderTransform>

Ink Canvas/MainWindow_cs/MW_Settings.cs

@@ -1054,6 +1054,34 @@ namespace Ink_Canvas
             
             PPTBtnPreviewLBTransform.X = scaledMarginOffset + (lbPosition * scaleX);
             PPTBtnPreviewRBTransform.X = -(scaledMarginOffset + (rbPosition * scaleX));
+            
+            // 计算工具栏尺寸
+            var dpiScaleX = 1.0;
+            var dpiScaleY = 1.0;
+            try
+            {
+                var source = PresentationSource.FromVisual(this);
+                if (source?.CompositionTarget != null)
+                {
+                    var transform = source.CompositionTarget.TransformToDevice;
+                    dpiScaleX = transform.M11;
+                    dpiScaleY = transform.M22;
+                }
+            }
+            catch
+            {
+                dpiScaleX = 1.0;
+                dpiScaleY = 1.0;
+            }
+            
+            // 计算工具栏的实际尺寸
+            const double baseToolbarHeight = 20.0; 
+            double actualToolbarHeight = baseToolbarHeight * dpiScaleY;
+            double scaledToolbarHeight = actualToolbarHeight * scaleY;
+            
+            // 设置工具栏尺寸
+            PPTBtnPreviewToolbar.Height = scaledToolbarHeight;
+            PPTBtnPreviewToolbar.Width = previewWidth; 
         }
 
         private void ToggleSwitchShowCursor_Toggled(object sender, RoutedEventArgs e)