Avalonia/samples/WinUIEmbedSample/MainWindow.xaml

<?xml version="1.0" encoding="utf-8"?>
<Window
    x:Class="WinUIEmbedSample.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:avalonia="using:Avalonia.WinUI"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    Title="WinUI + Avalonia side by side">

    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>

        <!-- Left: native WinUI controls -->
        <Border Grid.Column="0" Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
            <ScrollViewer Padding="16">
                <StackPanel Spacing="8">
                    <TextBlock Text="WinUI"
                               FontSize="22"
                               FontWeight="SemiBold"
                               Margin="0,0,0,4" />
                  
                    <Button x:Name="WinUiButton"
                            Content="WinUI button"
                            HorizontalAlignment="Stretch"
                            Click="WinUiButton_Click" />
                    <TextBlock x:Name="WinUiClickCount" Text="Clicked 0 times" />

                    <Slider x:Name="WinUiSlider"
                            Minimum="0"
                            Maximum="100"
                            Value="25"
                            ValueChanged="WinUiSlider_ValueChanged" />
                    <TextBlock x:Name="WinUiSliderValue" Text="Slider: 25" />

                    <TextBox PlaceholderText="Type something…"
                             Text="Hello from WinUI" />

                    <ToggleSwitch Header="ToggleSwitch" IsOn="True" />

                    <TextBlock Text="Drag source (native WinUI baseline)"
                               FontWeight="SemiBold"
                               Margin="0,16,0,0" />
                    <TextBlock Text="Drag the box below — payload: 'Hello from WinUI'. Drop into Notepad, this TextBox, or the Avalonia drop target. Use this to compare against the Avalonia drag source."
                               TextWrapping="Wrap"
                               Opacity="0.7"
                               FontSize="12" />
                    <Border x:Name="WinUiDragSource"
                            CanDrag="True"
                            Height="40"
                            BorderThickness="1"
                            CornerRadius="4"
                            Padding="8"
                            DragStarting="WinUiDragSource_DragStarting"
                            BorderBrush="{ThemeResource SystemControlForegroundBaseMediumLowBrush}"
                            Background="{ThemeResource SystemControlBackgroundAltHighBrush}">
                        <TextBlock Text="Drag me (native WinUI)"
                                   VerticalAlignment="Center" />
                    </Border>

                    <TextBlock Text="Theme" Margin="0,8,0,0" />
                    <ComboBox x:Name="WinUiThemeCombo"
                              SelectedIndex="2"
                              HorizontalAlignment="Stretch"
                              SelectionChanged="WinUiThemeCombo_SelectionChanged">
                        <x:String>Light</x:String>
                        <x:String>Dark</x:String>
                        <x:String>System</x:String>
                    </ComboBox>

                    <TextBlock Text="Automation diagnostics"
                               FontWeight="SemiBold"
                               Margin="0,16,0,0" />
                    <TextBlock Text="Verifies the WinUI automation peer over the Avalonia content. Click Probe peer at different lifecycle points to confirm reachability; the scale readout updates live."
                               TextWrapping="Wrap"
                               Opacity="0.7"
                               FontSize="12" />
                    <Button x:Name="ProbePeerButton"
                            Content="Probe peer + log children"
                            HorizontalAlignment="Stretch"
                            Click="ProbePeerButton_Click" />
                    <Button x:Name="ProbeDeepButton"
                            Content="Probe deep (walk full tree)"
                            HorizontalAlignment="Stretch"
                            Click="ProbeDeepButton_Click" />
                    <Button x:Name="ProbeWorkerButton"
                            Content="Probe deep on worker thread"
                            HorizontalAlignment="Stretch"
                            Click="ProbeWorkerButton_Click" />
                    <TextBlock x:Name="ScaleReadout"
                               Text="Scales: (waiting for Loaded)"
                               FontFamily="Consolas"
                               FontSize="12"
                               TextWrapping="Wrap" />
                    <TextBox x:Name="DiagnosticsLog"
                             IsReadOnly="True"
                             AcceptsReturn="True"
                             TextWrapping="Wrap"
                             FontFamily="Consolas"
                             FontSize="11"
                             Height="160"
                             Text="" />
                </StackPanel>
            </ScrollViewer>
        </Border>

        <!-- Right: Avalonia content embedded via AvaloniaSwapChainPanel -->
        <avalonia:AvaloniaSwapChainPanel Grid.Column="1" x:Name="AvaloniaPanel" />
    </Grid>
</Window>