Update SystemBackdropsSample

Author: ghost1372

WinUIGallery/ControlPagesSampleCode/SystemBackdrops/SystemBackdropsSample1.txt

@@ -5,7 +5,7 @@ WindowsSystemDispatcherQueueHelper m_wsdqHelper; // See separate sample below fo
 Microsoft.UI.Composition.SystemBackdrops.MicaController m_micaController;
 Microsoft.UI.Composition.SystemBackdrops.SystemBackdropConfiguration m_configurationSource;
 
-bool TrySetMicaBackdrop()
+bool TrySetMicaBackdrop(bool useMicaAlt)
 {
     if (Microsoft.UI.Composition.SystemBackdrops.MicaController.IsSupported())
     {
@@ -24,6 +24,8 @@ bool TrySetMicaBackdrop()
 
         m_micaController = new Microsoft.UI.Composition.SystemBackdrops.MicaController();
 
+        m_micaController.Kind = useMicaAlt ? Microsoft.UI.Composition.SystemBackdrops.MicaKind.BaseAlt : Microsoft.UI.Composition.SystemBackdrops.MicaKind.Base;
+
         // Enable the system backdrop.
         // Note: Be sure to have "using WinRT;" to support the Window.As<...>() call.
         m_micaController.AddSystemBackdropTarget(this.As<Microsoft.UI.Composition.ICompositionSupportsSystemBackdrop>());

WinUIGallery/ControlPagesSampleCode/SystemBackdrops/SystemBackdropsSample2.txt

@@ -5,7 +5,7 @@ WindowsSystemDispatcherQueueHelper m_wsdqHelper; // See separate sample below fo
 Microsoft.UI.Composition.SystemBackdrops.DesktopAcrylicController m_acrylicController;
 Microsoft.UI.Composition.SystemBackdrops.SystemBackdropConfiguration m_configurationSource;
 
-bool TrySetAcrylicBackdrop()
+bool TrySetAcrylicBackdrop(bool useAcrylicThin)
 {
     if (Microsoft.UI.Composition.SystemBackdrops.DesktopAcrylicController.IsSupported())
     {
@@ -24,6 +24,8 @@ bool TrySetAcrylicBackdrop()
 
         m_acrylicController = new Microsoft.UI.Composition.SystemBackdrops.DesktopAcrylicController();
 
+        m_acrylicController.Kind = useAcrylicThin ? Microsoft.UI.Composition.SystemBackdrops.DesktopAcrylicKind.Thin : Microsoft.UI.Composition.SystemBackdrops.DesktopAcrylicKind.Base;
+
         // Enable the system backdrop.
         // Note: Be sure to have "using WinRT;" to support the Window.As<...>() call.
         m_acrylicController.AddSystemBackdropTarget(this.As<Microsoft.UI.Composition.ICompositionSupportsSystemBackdrop>());