Add NativeAOT Support (#1916)

**This PR adds native AOT support #1627 .**

- [x] Using x:Bind instead of Binding
- [x] Using CsWin32 with Disabled Marshaling (NativeMethods)
- [x] Mark Classes as partial
- [x] Remove Reflections
- [x] BindingPage (NonExistentProperty Removed because xBind does not
support it)
- [ ] Enforce AOT warnings as errors (Seperate PR)

> [!Note]
> - The app is using reflection and DllImport somewhere, but I didn’t
see any trimming or AOT warnings, and I tested it locally without any
issues—so I didn’t modify that code.
> - There’s a warning related to `FreeLibrarySafeHandle`, which comes
from CsWin32. However, according to this
[answer](microsoft/CsWin32#1438 (comment)),
it's safe to ignore for now as long as you're not passing these handles
across the WinRT ABI.


# Notes for Future Developers / Contributors 
### Please read carefully before modifying the codebase:

> [!Warning]
> - Avoid using reflection whenever possible. It can cause issues with
trimming and Native AOT.
> - Enum bindings: Use the recommended pattern.
> Instead of:
> `private IReadOnlyList<TitleBarTheme> titleBarThemes =
Enum.GetValues(typeof(TitleBarTheme)).Cast<TitleBarTheme>().ToList();`
> Use:
> `private IReadOnlyList<TitleBarTheme> titleBarThemes { get; set; } =
new List<TitleBarTheme>(Enum.GetValues<TitleBarTheme>());`
> - Avoid using P/Invoke directly. Use
[CsWin32](https://github.com/microsoft/cswin32) and define your APIs in
the NativeMethods.txt file.
> - Mark classes as partial.
> - Always provide a DataTemplate with x:DataType and avoid using
`SelectedValuePath`, `DisplayMemberPath`.
> - Avoid binding directly to IEnumerable. Always call `.ToList()` to
avoid runtime exceptions.

---------

Co-authored-by: Niels Laute <niels.laute@live.nl>
Co-authored-by: Zakaria Tahri <zakotahri@outlook.com>
Co-authored-by: Marcel Wagner <marcelwagner@microsoft.com>
Co-authored-by: Marcel W. <marcel.alex.wagner@outlook.com>

Author: 4 people

WinUIGallery/App.xaml

@@ -69,8 +69,8 @@
                 x:Key="inverseNullToVisibilityConverter"
                 NonNullValue="Collapsed"
                 NullValue="Visible" />
-            <converters:BooleanToValueConverter x:Key="booleanToValueConverter" />
             <converters:DoubleToThicknessConverter x:Key="doubleToThicknessConverter" />
+            <converters:BrushToColorConverter x:Key="brushToColorConverter" />
         </ResourceDictionary>
     </Application.Resources>
 </Application>

WinUIGallery/App.xaml.cs

@@ -13,7 +13,7 @@
 using Windows.ApplicationModel.Activation;
 using WinUIGallery.Helpers;
 using WinUIGallery.Pages;
-using static WinUIGallery.Helpers.Win32;
+using static WinUIGallery.Helpers.NativeMethods;
 
 namespace WinUIGallery;
 
@@ -23,8 +23,6 @@ namespace WinUIGallery;
 sealed partial class App : Application
 {
     internal static MainWindow MainWindow { get; private set; } = null!;
-    private static int registeredKeyPressedHook = 0;
-    private HookProc keyEventHook;
 
     /// <summary>
     /// Initializes the singleton Application object. This is the first line of authored code
@@ -55,8 +53,7 @@ protected override void OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs ar
         }
 #endif
 
-        keyEventHook = KeyEventHook;
-        registeredKeyPressedHook = SetWindowKeyHook(keyEventHook);
+        SetWindowKeyHook();
 
         EnsureWindow();
 
@@ -66,16 +63,6 @@ protected override void OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs ar
         };
     }
 
-    private int KeyEventHook(int nCode, IntPtr wParam, IntPtr lParam)
-    {
-        if (nCode >= 0 && IsKeyDownHook(lParam))
-        {
-            RootFrameNavigationHelper.RaiseKeyPressed((uint)wParam);
-        }
-
-        return CallNextHookEx(registeredKeyPressedHook, nCode, wParam, lParam);
-    }
-
     private void DebugSettings_BindingFailed(object sender, BindingFailedEventArgs e)
     {
         // Ignore the exception from NonExistentProperty in BindingPage.xaml, 

WinUIGallery/Assets/AnimatedVisuals/LottieLogo1.cs

@@ -14,15 +14,15 @@
 
 namespace AnimatedVisuals;
 
-sealed class LottieLogo1 : IAnimatedVisualSource
+sealed partial class LottieLogo1 : IAnimatedVisualSource
 {
     public IAnimatedVisual TryCreateAnimatedVisual(Compositor compositor, out object diagnostics)
     {
         diagnostics = null;
         return new AnimatedVisual(compositor);
     }
 
-    sealed class AnimatedVisual : IAnimatedVisual
+    sealed partial class AnimatedVisual : IAnimatedVisual
     {
         const long c_durationTicks = 59670000;
         readonly Compositor _c;

WinUIGallery/Controls/CopyButton.xaml

@@ -6,12 +6,27 @@
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:local="using:WinUIGallery.Controls">
 
+    <ResourceDictionary.ThemeDictionaries>
+        <ResourceDictionary x:Key="Dark">
+            <StaticResource x:Key="CopyButtonPointerOverForegroundBrush" ResourceKey="ButtonForegroundPointerOver" />
+            <StaticResource x:Key="CopyButtonPressedForegroundBrush" ResourceKey="ButtonForegroundPressed" />
+        </ResourceDictionary>
+        <ResourceDictionary x:Key="Light">
+            <StaticResource x:Key="CopyButtonPointerOverForegroundBrush" ResourceKey="ButtonForegroundPointerOver" />
+            <StaticResource x:Key="CopyButtonPressedForegroundBrush" ResourceKey="ButtonForegroundPressed" />
+        </ResourceDictionary>
+        <ResourceDictionary x:Key="HighContrast">
+            <StaticResource x:Key="CopyButtonPointerOverForegroundBrush" ResourceKey="ButtonForegroundPointerOver" />
+            <StaticResource x:Key="CopyButtonPressedForegroundBrush" ResourceKey="ButtonForegroundPressed" />
+        </ResourceDictionary>
+    </ResourceDictionary.ThemeDictionaries>
+    
     <Style BasedOn="{StaticResource DefaultCopyButtonStyle}" TargetType="local:CopyButton" />
 
     <Style x:Key="DefaultCopyButtonStyle" TargetType="local:CopyButton">
         <Setter Property="Background" Value="{ThemeResource ButtonBackground}" />
         <Setter Property="BackgroundSizing" Value="InnerBorderEdge" />
-        <Setter Property="Foreground" Value="{x:Null}" />
+        <Setter Property="Foreground" Value="{ThemeResource ButtonForeground}" />
         <Setter Property="BorderBrush" Value="{ThemeResource ButtonBorderBrush}" />
         <Setter Property="BorderThickness" Value="{ThemeResource ButtonBorderThemeThickness}" />
         <Setter Property="Padding" Value="6" />
@@ -138,15 +153,15 @@
                             ContentTransitions="{TemplateBinding ContentTransitions}"
                             FontFamily="{TemplateBinding FontFamily}"
                             FontSize="{TemplateBinding FontSize}"
-                            Foreground="{Binding Foreground, RelativeSource={RelativeSource Mode=TemplatedParent}, TargetNullValue={ThemeResource ButtonForeground}}"
+                            Foreground="{TemplateBinding Foreground}"
                             RenderTransformOrigin=".5,.5">
                             <ContentPresenter.RenderTransform>
                                 <ScaleTransform x:Name="CopyToClipboardTextScaleTransform" />
                             </ContentPresenter.RenderTransform>
                         </ContentPresenter>
                         <ContentPresenter
                             x:Name="CopySuccessGlyph"
-                            Foreground="{Binding Foreground, RelativeSource={RelativeSource Mode=TemplatedParent}, TargetNullValue={ThemeResource ButtonForeground}}"
+                            Foreground="{TemplateBinding Foreground}"
                             Opacity="0"
                             RenderTransformOrigin=".5,.5">
                             <ContentPresenter.RenderTransform>
@@ -167,10 +182,10 @@
                                             <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonBorderBrushPointerOver}" />
                                         </ObjectAnimationUsingKeyFrames>
                                         <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Foreground">
-                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{Binding Foreground, RelativeSource={RelativeSource Mode=TemplatedParent}, TargetNullValue={ThemeResource ButtonForegroundPointerOver}}" />
+                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource CopyButtonPointerOverForegroundBrush}" />
                                         </ObjectAnimationUsingKeyFrames>
                                         <ObjectAnimationUsingKeyFrames Storyboard.TargetName="CopySuccessGlyph" Storyboard.TargetProperty="Foreground">
-                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{Binding Foreground, RelativeSource={RelativeSource Mode=TemplatedParent}, TargetNullValue={ThemeResource ButtonForegroundPointerOver}}" />
+                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource CopyButtonPointerOverForegroundBrush}" />
                                         </ObjectAnimationUsingKeyFrames>
                                     </Storyboard>
                                     <VisualState.Setters>
@@ -187,10 +202,10 @@
                                             <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonBorderBrushPressed}" />
                                         </ObjectAnimationUsingKeyFrames>
                                         <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Foreground">
-                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{Binding Foreground, RelativeSource={RelativeSource Mode=TemplatedParent}, TargetNullValue={ThemeResource ButtonForegroundPressed}}" />
+                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource CopyButtonPressedForegroundBrush}" />
                                         </ObjectAnimationUsingKeyFrames>
                                         <ObjectAnimationUsingKeyFrames Storyboard.TargetName="CopySuccessGlyph" Storyboard.TargetProperty="Foreground">
-                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{Binding Foreground, RelativeSource={RelativeSource Mode=TemplatedParent}, TargetNullValue={ThemeResource ButtonForegroundPressed}}" />
+                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource CopyButtonPressedForegroundBrush}" />
                                         </ObjectAnimationUsingKeyFrames>
                                     </Storyboard>
                                     <VisualState.Setters>

WinUIGallery/Controls/CopyButton.xaml.cs

@@ -8,7 +8,7 @@
 
 namespace WinUIGallery.Controls;
 
-public sealed class CopyButton : Button
+public sealed partial class CopyButton : Button
 {
     public CopyButton()
     {

WinUIGallery/Controls/DesignGuidance/ColorTile.xaml

@@ -52,7 +52,12 @@
                 Click="CopyBrushNameButton_Click"
                 Content=""
                 Foreground="{x:Bind Foreground, Mode=OneWay}"
-                ToolTipService.ToolTip="Copy brush name" />
+                ToolTipService.ToolTip="Copy brush name">
+                <local:CopyButton.Resources>
+                    <SolidColorBrush x:Key="CopyButtonPointerOverForegroundBrush" Color="{x:Bind Foreground, Mode=OneWay, Converter={StaticResource brushToColorConverter}}" />
+                    <SolidColorBrush x:Key="CopyButtonPressedForegroundBrush" Color="{x:Bind Foreground, Mode=OneWay, Converter={StaticResource brushToColorConverter}}" />
+                </local:CopyButton.Resources>
+            </local:CopyButton>
 
             <TextBlock
                 Grid.Row="1"

WinUIGallery/Controls/PageHeader.xaml

@@ -121,8 +121,8 @@
                                         <HyperlinkButton
                                             HorizontalAlignment="Stretch"
                                             HorizontalContentAlignment="Left"
-                                            NavigateUri="{Binding Uri}"
-                                            ToolTipService.ToolTip="{Binding Uri}">
+                                            NavigateUri="{x:Bind Uri}"
+                                            ToolTipService.ToolTip="{x:Bind Uri}">
                                             <TextBlock Text="{x:Bind Title}" />
                                         </HyperlinkButton>
                                     </DataTemplate>

WinUIGallery/Controls/SampleCodePresenter.xaml.cs

@@ -12,7 +12,6 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
-using System.Reflection;
 using System.Text.RegularExpressions;
 using Windows.ApplicationModel.DataTransfer;
 using Windows.Storage;
@@ -169,10 +168,12 @@ private async void FormatAndRenderSampleFromFile(string sourceRelativePath, Cont
         {
             string sampleString = null;
             StorageFile file = null;
-            if (!NativeHelper.IsAppPackaged)
+            if (!NativeMethods.IsAppPackaged)
             {
                 var relativePath = GetDerivedSourceUnpackaged(sourceRelativePath);
-                var sourcePath = Path.GetFullPath(Path.Combine(Path.GetDirectoryName(Assembly.GetEntryAssembly().Location), relativePath));
+
+                var sourcePath = Path.GetFullPath(Path.Combine(AppContext.BaseDirectory, relativePath));
+
                 file = await StorageFile.GetFileFromPathAsync(sourcePath);
             }
             else

WinUIGallery/Converters/BooleanToInvertedVisibilityConverter.cs

@@ -7,7 +7,7 @@
 
 namespace WinUIGallery.Converters;
 
-public sealed class BooleanToInvertedVisibilityConverter : IValueConverter
+public sealed partial class BooleanToInvertedVisibilityConverter : IValueConverter
 {
     public object Convert(object value, Type targetType, object parameter, string language)
     {

…ry/Converters/BooleanToValueConverter.cs …lery/Converters/BrushToColorConverter.csWinUIGallery/Converters/BooleanToValueConverter.cs renamed to WinUIGallery/Converters/BrushToColorConverter.cs WinUIGallery/Converters/BooleanToValueConverter.cs renamed to WinUIGallery/Converters/BrushToColorConverter.cs

@@ -1,16 +1,22 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
+using Microsoft.UI;
 using Microsoft.UI.Xaml.Data;
+using Microsoft.UI.Xaml.Media;
 using System;
 
 namespace WinUIGallery.Converters;
-
-public sealed class BooleanToValueConverter : IValueConverter
+public partial class BrushToColorConverter : IValueConverter
 {
     public object Convert(object value, Type targetType, object parameter, string language)
     {
-        return (bool)value ? parameter : null;
+        if (value is SolidColorBrush solidColorBrush)
+        {
+            return solidColorBrush.Color;
+        }
+
+        return Colors.Transparent;
     }
 
     public object ConvertBack(object value, Type targetType, object parameter, string language)