Fixes/checks for XamlRoot downlevel.

azchohfi · azchohfi · commit 92f8328fd47b · 2020-04-08T00:32:28.000-07:00
diff --git a/Microsoft.Toolkit.Uwp.SampleApp/App.xaml.cs b/Microsoft.Toolkit.Uwp.SampleApp/App.xaml.cs
@@ -76,7 +76,7 @@ protected override async void OnLaunched(LaunchActivatedEventArgs e)
                 await RunAppInitialization(e?.Arguments);
             }
 
-            SystemInformation.Instance.TrackAppUse(e, Window.Current.Content.XamlRoot);
+            SystemInformation.Instance.TrackAppUse(e);
         }
 
         /// <summary>
diff --git a/Microsoft.Toolkit.Uwp.SampleApp/SamplePages/Eyedropper/EyedropperPage.xaml.cs b/Microsoft.Toolkit.Uwp.SampleApp/SamplePages/Eyedropper/EyedropperPage.xaml.cs
@@ -29,7 +29,6 @@ private void Load()
             SampleController.Current.RegisterNewCommand("Global Eyedropper", async (sender, args) =>
             {
                 var eyedropper = new Eyedropper();
-                eyedropper.XamlRoot = base.XamlRoot;
                 var color = await eyedropper.Open();
                 InAppNotification.Show($"You get {color}.", 3000);
             });
diff --git a/Microsoft.Toolkit.Uwp.UI.Controls.DataGrid/DataGrid/DataGridColumn.cs b/Microsoft.Toolkit.Uwp.UI.Controls.DataGrid/DataGrid/DataGridColumn.cs
@@ -8,6 +8,7 @@
 using Microsoft.Toolkit.Uwp.UI.Controls.DataGridInternals;
 using Microsoft.Toolkit.Uwp.UI.Controls.Primitives;
 using Microsoft.Toolkit.Uwp.UI.Data.Utilities;
+using Microsoft.Toolkit.Uwp.Utilities;
 using Windows.UI.Xaml;
 using Windows.UI.Xaml.Controls;
 using Windows.UI.Xaml.Data;
@@ -1060,7 +1061,7 @@ internal void ComputeLayoutRoundedWidth(double leftEdge)
             if (this.OwningGrid != null && this.OwningGrid.UseLayoutRounding)
             {
                 double scale;
-                if (OwningGrid.XamlRoot != null)
+                if (TypeHelper.IsXamlRootAvailable && OwningGrid.XamlRoot != null)
                 {
                     scale = OwningGrid.XamlRoot.RasterizationScale;
                 }
diff --git a/Microsoft.Toolkit.Uwp.UI.Controls.DataGrid/Utilities/TypeHelper.cs b/Microsoft.Toolkit.Uwp.UI.Controls.DataGrid/Utilities/TypeHelper.cs
@@ -17,8 +17,9 @@ internal static class TypeHelper
         internal const char PropertyNameSeparator = '.';
         internal const char RightIndexerToken = ']';
 
-        private static bool isAPIContractAvailableInitialized = false;
+        private static bool isAPIsAvailableInitialized = false;
         private static bool isRS3OrHigher = false;
+        private static bool isXamlRootAvailable = false;
 
         // Methods
         private static Type FindGenericType(Type definition, Type type)
@@ -412,19 +413,33 @@ internal static bool IsRS3OrHigher
         {
             get
             {
-                if (!isAPIContractAvailableInitialized)
+                if (!isAPIsAvailableInitialized)
                 {
-                    InitializeAPIContractAvailable();
+                    InitializeAPIsAvailable();
                 }
 
                 return isRS3OrHigher;
             }
         }
 
-        internal static void InitializeAPIContractAvailable()
+        internal static bool IsXamlRootAvailable
+        {
+            get
+            {
+                if (!isAPIsAvailableInitialized)
+                {
+                    InitializeAPIsAvailable();
+                }
+
+                return isXamlRootAvailable;
+            }
+        }
+
+        internal static void InitializeAPIsAvailable()
         {
             isRS3OrHigher = Windows.Foundation.Metadata.ApiInformation.IsApiContractPresent("Windows.Foundation.UniversalApiContract", 5);
-            isAPIContractAvailableInitialized = true;
+            isXamlRootAvailable = Windows.Foundation.Metadata.ApiInformation.IsPropertyPresent("Windows.UI.Xaml.UIElement", "XamlRoot");
+            isAPIsAvailableInitialized = true;
         }
     }
 }
diff --git a/Microsoft.Toolkit.Uwp.UI.Controls/ControlHelpers.XamlHost.cs b/Microsoft.Toolkit.Uwp.UI.Controls/ControlHelpers.XamlHost.cs
@@ -0,0 +1,34 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace Microsoft.Toolkit.Uwp.UI.Controls
+{
+    /// <summary>
+    /// Internal class used to provide helpers for controls
+    /// </summary>
+    internal static partial class ControlHelpers
+    {
+        private static bool isXamlRootAvailable = Windows.Foundation.Metadata.ApiInformation.IsPropertyPresent("Windows.UI.Xaml.UIElement", "XamlRoot");
+        private static bool isXamlRootAvailableInitialized = false;
+
+        internal static bool IsXamlRootAvailable
+        {
+            get
+            {
+                if (!isXamlRootAvailableInitialized)
+                {
+                    InitializeXamlRootAvailable();
+                }
+
+                return isXamlRootAvailable;
+            }
+        }
+
+        internal static void InitializeXamlRootAvailable()
+        {
+            isXamlRootAvailable = Windows.Foundation.Metadata.ApiInformation.IsPropertyPresent("Windows.UI.Xaml.UIElement", "XamlRoot");
+            isXamlRootAvailableInitialized = true;
+        }
+    }
+}
diff --git a/Microsoft.Toolkit.Uwp.UI.Controls/Eyedropper/Eyedropper.Logic.cs b/Microsoft.Toolkit.Uwp.UI.Controls/Eyedropper/Eyedropper.Logic.cs
@@ -53,7 +53,7 @@ private void UpdateWorkArea()
                 var top = WorkArea.Top;
                 double right;
                 double bottom;
-                if (XamlRoot != null)
+                if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)
                 {
                     right = XamlRoot.Size.Width - WorkArea.Right;
                     bottom = XamlRoot.Size.Height - WorkArea.Bottom;
@@ -113,7 +113,7 @@ internal async Task UpdateAppScreenshotAsync()
             double width;
             double height;
             UIElement content;
-            if (XamlRoot != null)
+            if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)
             {
                 scale = XamlRoot.RasterizationScale;
                 width = XamlRoot.Size.Width;
diff --git a/Microsoft.Toolkit.Uwp.UI.Controls/Eyedropper/Eyedropper.cs b/Microsoft.Toolkit.Uwp.UI.Controls/Eyedropper/Eyedropper.cs
@@ -109,12 +109,12 @@ public async Task<Color> Open(Point? startPoint = null)
                 Child = _rootGrid
             };
 
-            if (XamlRoot != null)
+            if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)
             {
                 _popup.XamlRoot = XamlRoot;
             }
 
-            if (_popup.XamlRoot != null)
+            if (ControlHelpers.IsXamlRootAvailable && _popup.XamlRoot != null)
             {
                 _rootGrid.Width = _popup.XamlRoot.Size.Width;
                 _rootGrid.Height = _popup.XamlRoot.Size.Height;
@@ -151,7 +151,7 @@ private void HookUpEvents()
             Unloaded -= Eyedropper_Unloaded;
             Unloaded += Eyedropper_Unloaded;
 
-            if (XamlRoot != null)
+            if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)
             {
                 XamlRoot.Changed -= XamlRoot_Changed;
                 XamlRoot.Changed += XamlRoot_Changed;
@@ -197,7 +197,7 @@ private async void XamlRoot_Changed(XamlRoot sender, XamlRootChangedEventArgs ar
         private void UnhookEvents()
         {
             Unloaded -= Eyedropper_Unloaded;
-            if (XamlRoot != null)
+            if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)
             {
                 XamlRoot.Changed -= XamlRoot_Changed;
             }
diff --git a/Microsoft.Toolkit.Uwp.UI.Controls/Eyedropper/EyedropperToolButton.Properties.cs b/Microsoft.Toolkit.Uwp.UI.Controls/Eyedropper/EyedropperToolButton.Properties.cs
@@ -80,7 +80,7 @@ private static void OnEyedropperEnabledChanged(DependencyObject d, DependencyPro
                 if (eyedropperToolButton.EyedropperEnabled)
                 {
                     VisualStateManager.GoToState(eyedropperToolButton, eyedropperToolButton.IsPointerOver ? EyedropperEnabledPointerOverState : EyedropperEnabledState, true);
-                    if (eyedropperToolButton.XamlRoot != null)
+                    if (ControlHelpers.IsXamlRootAvailable && eyedropperToolButton.XamlRoot != null)
                     {
                         eyedropperToolButton._eyedropper.XamlRoot = eyedropperToolButton.XamlRoot;
                     }
diff --git a/Microsoft.Toolkit.Uwp.UI.Controls/Eyedropper/EyedropperToolButton.cs b/Microsoft.Toolkit.Uwp.UI.Controls/Eyedropper/EyedropperToolButton.cs
@@ -62,7 +62,7 @@ private void HookUpEvents()
             Unloaded += EyedropperToolButton_Unloaded;
             ActualThemeChanged -= EyedropperToolButton_ActualThemeChanged;
             ActualThemeChanged += EyedropperToolButton_ActualThemeChanged;
-            if (XamlRoot != null)
+            if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)
             {
                 XamlRoot.Changed -= XamlRoot_Changed;
                 XamlRoot.Changed += XamlRoot_Changed;
@@ -87,7 +87,7 @@ private void UnhookEvents()
             Click -= EyedropperToolButton_Click;
             Unloaded -= EyedropperToolButton_Unloaded;
             ActualThemeChanged -= EyedropperToolButton_ActualThemeChanged;
-            if (XamlRoot != null)
+            if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)
             {
                 XamlRoot.Changed -= XamlRoot_Changed;
             }
@@ -206,7 +206,7 @@ private async Task UpdateEyedropperWorkAreaAsync()
             if (TargetElement != null)
             {
                 UIElement content;
-                if (XamlRoot != null)
+                if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)
                 {
                     content = XamlRoot.Content;
                 }
@@ -218,7 +218,7 @@ private async Task UpdateEyedropperWorkAreaAsync()
                 var transform = TargetElement.TransformToVisual(content);
                 var position = transform.TransformPoint(default(Point));
                 _eyedropper.WorkArea = new Rect(position, new Size(TargetElement.ActualWidth, TargetElement.ActualHeight));
-                if (XamlRoot != null)
+                if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)
                 {
                     _eyedropper.XamlRoot = XamlRoot;
                 }
diff --git a/Microsoft.Toolkit.Uwp.UI.Controls/InfiniteCanvas/Controls/InfiniteCanvasVirtualDrawingSurface.cs b/Microsoft.Toolkit.Uwp.UI.Controls/InfiniteCanvas/Controls/InfiniteCanvasVirtualDrawingSurface.cs
@@ -78,7 +78,7 @@ internal void ConfigureSpriteVisual(double width, double height, float zoomFacto
 
         internal void SetScale(float zoomFactor)
         {
-            if (XamlRoot != null)
+            if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)
             {
                 _screenScale = XamlRoot.RasterizationScale;
             }
diff --git a/Microsoft.Toolkit.Uwp.UI.Controls/InfiniteCanvas/InfiniteCanvas.cs b/Microsoft.Toolkit.Uwp.UI.Controls/InfiniteCanvas/InfiniteCanvas.cs
@@ -188,7 +188,7 @@ private double ViewPortHeight
                 double height;
                 if (double.IsNaN(_infiniteCanvasScrollViewer.Height))
                 {
-                    if (_infiniteCanvasScrollViewer.XamlRoot != null)
+                    if (ControlHelpers.IsXamlRootAvailable && _infiniteCanvasScrollViewer.XamlRoot != null)
                     {
                         height = _infiniteCanvasScrollViewer.XamlRoot.Size.Height;
                     }
@@ -213,7 +213,7 @@ private double ViewPortWidth
                 double width;
                 if (double.IsNaN(_infiniteCanvasScrollViewer.Width))
                 {
-                    if (_infiniteCanvasScrollViewer.XamlRoot != null)
+                    if (ControlHelpers.IsXamlRootAvailable && _infiniteCanvasScrollViewer.XamlRoot != null)
                     {
                         width = _infiniteCanvasScrollViewer.XamlRoot.Size.Width;
                     }
@@ -269,7 +269,7 @@ protected override void OnApplyTemplate()
 
             if (double.IsNaN(_infiniteCanvasScrollViewer.Width))
             {
-                if (_infiniteCanvasScrollViewer.XamlRoot != null)
+                if (ControlHelpers.IsXamlRootAvailable && _infiniteCanvasScrollViewer.XamlRoot != null)
                 {
                     _infiniteCanvasScrollViewer.Width = _infiniteCanvasScrollViewer.XamlRoot.Size.Width;
                 }
@@ -281,7 +281,7 @@ protected override void OnApplyTemplate()
 
             if (double.IsNaN(_infiniteCanvasScrollViewer.Height))
             {
-                if (_infiniteCanvasScrollViewer.XamlRoot != null)
+                if (ControlHelpers.IsXamlRootAvailable && _infiniteCanvasScrollViewer.XamlRoot != null)
                 {
                     _infiniteCanvasScrollViewer.Height = _infiniteCanvasScrollViewer.XamlRoot.Size.Height;
                 }
diff --git a/Microsoft.Toolkit.Uwp.UI.Controls/Menu/Menu.Logic.cs b/Microsoft.Toolkit.Uwp.UI.Controls/Menu/Menu.Logic.cs
@@ -193,7 +193,7 @@ internal FlyoutPlacementMode GetMenuFlyoutPlacementMode()
             UIElement content;
             double height;
             double width;
-            if (XamlRoot != null)
+            if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)
             {
                 content = XamlRoot.Content;
                 height = XamlRoot.Size.Height;
@@ -303,7 +303,7 @@ private void HideMenuItemsTooltips()
 
         internal void CalculateBounds()
         {
-            var ttv = TransformToVisual(XamlRoot != null ? XamlRoot.Content : Window.Current.Content);
+            var ttv = TransformToVisual(ControlHelpers.IsXamlRootAvailable && XamlRoot != null ? XamlRoot.Content : Window.Current.Content);
             Point screenCoords = ttv.TransformPoint(new Point(0, 0));
             _bounds.X = screenCoords.X;
             _bounds.Y = screenCoords.Y;
diff --git a/Microsoft.Toolkit.Uwp.UI.Controls/Menu/MenuItem.cs b/Microsoft.Toolkit.Uwp.UI.Controls/Menu/MenuItem.cs
@@ -111,7 +111,7 @@ protected override void OnApplyTemplate()
                 MenuFlyout.Closed -= MenuFlyout_Closed;
             }
 
-            if (XamlRoot != null)
+            if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)
             {
                 MenuFlyout.XamlRoot = XamlRoot;
             }
@@ -156,7 +156,7 @@ private void MenuItem_IsEnabledChanged(object sender, DependencyPropertyChangedE
         internal void CalculateBounds()
         {
             UIElement content;
-            if (XamlRoot != null)
+            if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)
             {
                 content = XamlRoot.Content;
             }
@@ -340,7 +340,7 @@ private void MenuFlyout_Opened(object sender, object e)
                 UIElement content;
                 double outerContentWidth;
                 double outerContentHeight;
-                if (MenuFlyout.XamlRoot != null)
+                if (ControlHelpers.IsXamlRootAvailable && MenuFlyout.XamlRoot != null)
                 {
                     popups = VisualTreeHelper.GetOpenPopupsForXamlRoot(MenuFlyout.XamlRoot);
                     content = MenuFlyout.XamlRoot.Content;
diff --git a/Microsoft.Toolkit.Uwp.UI.Controls/OrbitView/OrbitViewPanel.cs b/Microsoft.Toolkit.Uwp.UI.Controls/OrbitView/OrbitViewPanel.cs
@@ -64,7 +64,7 @@ protected override Size MeasureOverride(Size availableSize)
 
             if (double.IsInfinity(width))
             {
-                if (XamlRoot != null)
+                if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)
                 {
                     width = XamlRoot.Size.Width;
                 }
@@ -76,7 +76,7 @@ protected override Size MeasureOverride(Size availableSize)
 
             if (double.IsInfinity(height))
             {
-                if (XamlRoot != null)
+                if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)
                 {
                     height = XamlRoot.Size.Height;
                 }
diff --git a/Microsoft.Toolkit.Uwp.UI.Controls/TextToolbar/Formats/MarkDown/MarkDownFormatter.cs b/Microsoft.Toolkit.Uwp.UI.Controls/TextToolbar/Formats/MarkDown/MarkDownFormatter.cs
@@ -40,7 +40,7 @@ public void StyleHeader(ToolbarButton button)
             var list = new ListBox { Margin = new Thickness(0), Padding = new Thickness(0) };
             headerFlyout = new Flyout { Content = list };
 
-            if (button.XamlRoot != null)
+            if (ControlHelpers.IsXamlRootAvailable && button.XamlRoot != null)
             {
                 headerFlyout.XamlRoot = button.XamlRoot;
             }
diff --git a/Microsoft.Toolkit.Uwp.UI.Controls/TokenizingTextBox/TokenizingTextBox.cs b/Microsoft.Toolkit.Uwp.UI.Controls/TokenizingTextBox/TokenizingTextBox.cs
@@ -121,7 +121,7 @@ protected override void OnApplyTemplate()
             selectAllMenuItem.Click += (s, e) => SelectAll();
             var menuFlyout = new MenuFlyout();
             menuFlyout.Items.Add(selectAllMenuItem);
-            if (XamlRoot != null)
+            if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)
             {
                 menuFlyout.XamlRoot = XamlRoot;
             }
@@ -330,7 +330,7 @@ private async Task AddToken(object data)
 
             var menuFlyout = new MenuFlyout();
             menuFlyout.Items.Add(removeMenuItem);
-            if (XamlRoot != null)
+            if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)
             {
                 menuFlyout.XamlRoot = XamlRoot;
             }
diff --git a/Microsoft.Toolkit.Uwp/Helpers/DispatcherQueueHelper.cs b/Microsoft.Toolkit.Uwp/Helpers/DispatcherQueueHelper.cs

Original file line number	Diff line number	Diff line change
`@@ -76,7 +76,7 @@ protected override async void OnLaunched(LaunchActivatedEventArgs e)`
`76`	`76`	`await RunAppInitialization(e?.Arguments);`
`77`	`77`	`}`
`78`	`78`
`79`		`- SystemInformation.Instance.TrackAppUse(e, Window.Current.Content.XamlRoot);`
	`79`	`+ SystemInformation.Instance.TrackAppUse(e);`
`80`	`80`	`}`
`81`	`81`
`82`	`82`	`/// <summary>`
Original file line number	Diff line number	Diff line change
`@@ -29,7 +29,6 @@ private void Load()`
`29`	`29`	`SampleController.Current.RegisterNewCommand("Global Eyedropper", async (sender, args) =>`
`30`	`30`	`{`
`31`	`31`	`var eyedropper = new Eyedropper();`
`32`		`- eyedropper.XamlRoot = base.XamlRoot;`
`33`	`32`	`var color = await eyedropper.Open();`
`34`	`33`	`InAppNotification.Show($"You get {color}.", 3000);`
`35`	`34`	`});`
Original file line number	Diff line number	Diff line change
`@@ -8,6 +8,7 @@`
`8`	`8`	`using Microsoft.Toolkit.Uwp.UI.Controls.DataGridInternals;`
`9`	`9`	`using Microsoft.Toolkit.Uwp.UI.Controls.Primitives;`
`10`	`10`	`using Microsoft.Toolkit.Uwp.UI.Data.Utilities;`
	`11`	`+using Microsoft.Toolkit.Uwp.Utilities;`
`11`	`12`	`using Windows.UI.Xaml;`
`12`	`13`	`using Windows.UI.Xaml.Controls;`
`13`	`14`	`using Windows.UI.Xaml.Data;`
`@@ -1060,7 +1061,7 @@ internal void ComputeLayoutRoundedWidth(double leftEdge)`
`1060`	`1061`	`if (this.OwningGrid != null && this.OwningGrid.UseLayoutRounding)`
`1061`	`1062`	`{`
`1062`	`1063`	`double scale;`
`1063`		`- if (OwningGrid.XamlRoot != null)`
	`1064`	`+ if (TypeHelper.IsXamlRootAvailable && OwningGrid.XamlRoot != null)`
`1064`	`1065`	`{`
`1065`	`1066`	`scale = OwningGrid.XamlRoot.RasterizationScale;`
`1066`	`1067`	`}`
Original file line number	Diff line number	Diff line change
`@@ -17,8 +17,9 @@ internal static class TypeHelper`
`17`	`17`	`internal const char PropertyNameSeparator = '.';`
`18`	`18`	`internal const char RightIndexerToken = ']';`
`19`	`19`
`20`		`- private static bool isAPIContractAvailableInitialized = false;`
	`20`	`+ private static bool isAPIsAvailableInitialized = false;`
`21`	`21`	`private static bool isRS3OrHigher = false;`
	`22`	`+ private static bool isXamlRootAvailable = false;`
`22`	`23`
`23`	`24`	`// Methods`
`24`	`25`	`private static Type FindGenericType(Type definition, Type type)`
`@@ -412,19 +413,33 @@ internal static bool IsRS3OrHigher`
`412`	`413`	`{`
`413`	`414`	`get`
`414`	`415`	`{`
`415`		`- if (!isAPIContractAvailableInitialized)`
	`416`	`+ if (!isAPIsAvailableInitialized)`
`416`	`417`	`{`
`417`		`- InitializeAPIContractAvailable();`
	`418`	`+ InitializeAPIsAvailable();`
`418`	`419`	`}`
`419`	`420`
`420`	`421`	`return isRS3OrHigher;`
`421`	`422`	`}`
`422`	`423`	`}`
`423`	`424`
`424`		`- internal static void InitializeAPIContractAvailable()`
	`425`	`+ internal static bool IsXamlRootAvailable`
	`426`	`+ {`
	`427`	`+ get`
	`428`	`+ {`
	`429`	`+ if (!isAPIsAvailableInitialized)`
	`430`	`+ {`
	`431`	`+ InitializeAPIsAvailable();`
	`432`	`+ }`
	`433`	`+`
	`434`	`+ return isXamlRootAvailable;`
	`435`	`+ }`
	`436`	`+ }`
	`437`	`+`
	`438`	`+ internal static void InitializeAPIsAvailable()`
`425`	`439`	`{`
`426`	`440`	`isRS3OrHigher = Windows.Foundation.Metadata.ApiInformation.IsApiContractPresent("Windows.Foundation.UniversalApiContract", 5);`
`427`		`- isAPIContractAvailableInitialized = true;`
	`441`	`+ isXamlRootAvailable = Windows.Foundation.Metadata.ApiInformation.IsPropertyPresent("Windows.UI.Xaml.UIElement", "XamlRoot");`
	`442`	`+ isAPIsAvailableInitialized = true;`
`428`	`443`	`}`
`429`	`444`	`}`
`430`	`445`	`}`
Original file line number	Diff line number	Diff line change
`@@ -109,12 +109,12 @@ public async Task<Color> Open(Point? startPoint = null)`
`109`	`109`	`Child = _rootGrid`
`110`	`110`	`};`
`111`	`111`
`112`		`- if (XamlRoot != null)`
	`112`	`+ if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)`
`113`	`113`	`{`
`114`	`114`	`_popup.XamlRoot = XamlRoot;`
`115`	`115`	`}`
`116`	`116`
`117`		`- if (_popup.XamlRoot != null)`
	`117`	`+ if (ControlHelpers.IsXamlRootAvailable && _popup.XamlRoot != null)`
`118`	`118`	`{`
`119`	`119`	`_rootGrid.Width = _popup.XamlRoot.Size.Width;`
`120`	`120`	`_rootGrid.Height = _popup.XamlRoot.Size.Height;`
`@@ -151,7 +151,7 @@ private void HookUpEvents()`
`151`	`151`	`Unloaded -= Eyedropper_Unloaded;`
`152`	`152`	`Unloaded += Eyedropper_Unloaded;`
`153`	`153`
`154`		`- if (XamlRoot != null)`
	`154`	`+ if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)`
`155`	`155`	`{`
`156`	`156`	`XamlRoot.Changed -= XamlRoot_Changed;`
`157`	`157`	`XamlRoot.Changed += XamlRoot_Changed;`
`@@ -197,7 +197,7 @@ private async void XamlRoot_Changed(XamlRoot sender, XamlRootChangedEventArgs ar`
`197`	`197`	`private void UnhookEvents()`
`198`	`198`	`{`
`199`	`199`	`Unloaded -= Eyedropper_Unloaded;`
`200`		`- if (XamlRoot != null)`
	`200`	`+ if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)`
`201`	`201`	`{`
`202`	`202`	`XamlRoot.Changed -= XamlRoot_Changed;`
`203`	`203`	`}`
Original file line number	Diff line number	Diff line change
`@@ -80,7 +80,7 @@ private static void OnEyedropperEnabledChanged(DependencyObject d, DependencyPro`
`80`	`80`	`if (eyedropperToolButton.EyedropperEnabled)`
`81`	`81`	`{`
`82`	`82`	`VisualStateManager.GoToState(eyedropperToolButton, eyedropperToolButton.IsPointerOver ? EyedropperEnabledPointerOverState : EyedropperEnabledState, true);`
`83`		`- if (eyedropperToolButton.XamlRoot != null)`
	`83`	`+ if (ControlHelpers.IsXamlRootAvailable && eyedropperToolButton.XamlRoot != null)`
`84`	`84`	`{`
`85`	`85`	`eyedropperToolButton._eyedropper.XamlRoot = eyedropperToolButton.XamlRoot;`
`86`	`86`	`}`
Original file line number	Diff line number	Diff line change
`@@ -62,7 +62,7 @@ private void HookUpEvents()`
`62`	`62`	`Unloaded += EyedropperToolButton_Unloaded;`
`63`	`63`	`ActualThemeChanged -= EyedropperToolButton_ActualThemeChanged;`
`64`	`64`	`ActualThemeChanged += EyedropperToolButton_ActualThemeChanged;`
`65`		`- if (XamlRoot != null)`
	`65`	`+ if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)`
`66`	`66`	`{`
`67`	`67`	`XamlRoot.Changed -= XamlRoot_Changed;`
`68`	`68`	`XamlRoot.Changed += XamlRoot_Changed;`
`@@ -87,7 +87,7 @@ private void UnhookEvents()`
`87`	`87`	`Click -= EyedropperToolButton_Click;`
`88`	`88`	`Unloaded -= EyedropperToolButton_Unloaded;`
`89`	`89`	`ActualThemeChanged -= EyedropperToolButton_ActualThemeChanged;`
`90`		`- if (XamlRoot != null)`
	`90`	`+ if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)`
`91`	`91`	`{`
`92`	`92`	`XamlRoot.Changed -= XamlRoot_Changed;`
`93`	`93`	`}`
`@@ -206,7 +206,7 @@ private async Task UpdateEyedropperWorkAreaAsync()`
`206`	`206`	`if (TargetElement != null)`
`207`	`207`	`{`
`208`	`208`	`UIElement content;`
`209`		`- if (XamlRoot != null)`
	`209`	`+ if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)`
`210`	`210`	`{`
`211`	`211`	`content = XamlRoot.Content;`
`212`	`212`	`}`
`@@ -218,7 +218,7 @@ private async Task UpdateEyedropperWorkAreaAsync()`
`218`	`218`	`var transform = TargetElement.TransformToVisual(content);`
`219`	`219`	`var position = transform.TransformPoint(default(Point));`
`220`	`220`	`_eyedropper.WorkArea = new Rect(position, new Size(TargetElement.ActualWidth, TargetElement.ActualHeight));`
`221`		`- if (XamlRoot != null)`
	`221`	`+ if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)`
`222`	`222`	`{`
`223`	`223`	`_eyedropper.XamlRoot = XamlRoot;`
`224`	`224`	`}`
Original file line number	Diff line number	Diff line change
`@@ -78,7 +78,7 @@ internal void ConfigureSpriteVisual(double width, double height, float zoomFacto`
`78`	`78`
`79`	`79`	`internal void SetScale(float zoomFactor)`
`80`	`80`	`{`
`81`		`- if (XamlRoot != null)`
	`81`	`+ if (ControlHelpers.IsXamlRootAvailable && XamlRoot != null)`
`82`	`82`	`{`
`83`	`83`	`_screenScale = XamlRoot.RasterizationScale;`
`84`	`84`	`}`