### Get Native Window Handle in C#

Source: https://context7.com/manfromarce/wpf-titlebar-menu/llms.txt

Provides a helper function to retrieve the native window handle for a given Window object in a C# application. This is often required for interacting with platform-specific APIs or older Win32 functions. It utilizes the WinRT.Interop.WindowNative class for this purpose.

```csharp
// NativeHelpers.cs
using Microsoft.UI.Xaml;

public static class NativeHelpers
{
    public static System.IntPtr GetWindowHandle(Window window)
    {
        return WinRT.Interop.WindowNative.GetWindowHandle(window);
    }
}
```

--------------------------------

### Configure WPF WindowChrome for Custom Title Bar

Source: https://context7.com/manfromarce/wpf-titlebar-menu/llms.txt

Configures WindowChrome to enable a custom title bar in WPF applications. It disables default Aero caption buttons and customizes caption height, while preserving native window behaviors like resizing and dragging. This setup is crucial for integrating custom UI elements into the window's non-client area.

```xml
<Window x:Class="WpfApp1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        Title="MainWindow" Width="800" Height="450"
        MinWidth="300" MinHeight="150"
        WindowStyle="SingleBorderWindow" ResizeMode="CanResize">

    <WindowChrome.WindowChrome>
        <WindowChrome
            CornerRadius="{x:Static SystemParameters.WindowCornerRadius}"
            GlassFrameThickness="1,0,1,1"
            NonClientFrameEdges="Left,Right,Bottom"
            ResizeBorderThickness="{x:Static SystemParameters.WindowResizeBorderThickness}"
            UseAeroCaptionButtons="False">
            <WindowChrome.CaptionHeight>
                <MultiBinding Converter="{StaticResource captionHeightConverter}">
                    <Binding ElementName="titlebar" Path="ActualHeight" />
                    <Binding ElementName="window" Path="BorderThickness.Top" />
                </MultiBinding>
            </WindowChrome.CaptionHeight>
        </WindowChrome>
    </WindowChrome.WindowChrome>

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>

        <!-- Title bar content goes here -->
        <Grid x:Name="titlebar" Grid.Row="0"
              MinHeight="{StaticResource TitleBarHeight}"
              Background="{StaticResource TitleBarBackground}">
            <!-- Menu and buttons -->
        </Grid>

        <!-- Main content area -->
        <TextBlock Grid.Row="1" Margin="5" Text="Content" />
    </Grid>
</Window>
```

--------------------------------

### Implement Theme Switching in WPF

Source: https://context7.com/manfromarce/wpf-titlebar-menu/llms.txt

C# code for handling theme switching in a WPF application. This includes methods to close the window, open a new window, toggle fullscreen, and apply system, light, or dark themes. It relies on the Avalonia framework.

```csharp
// MainWindow.axaml.cs
using Avalonia.Controls;
using Avalonia.Styling;

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }

    private void QuitMenuItem_Click(object? sender, EventArgs e)
    {
        this.Close();
    }

    public void NewWindowMenuItem_Click(object? sender, EventArgs args)
    {
        var window = new MainWindow();
        window.Show();
    }

    public void FullScreen_Click(object? sender, EventArgs args)
    {
        this.WindowState = (this.WindowState == WindowState.FullScreen
            ? WindowState.Maximized
            : WindowState.FullScreen);
    }

    public void SystemTheme_Click(object? sender, EventArgs args)
    {
        App.Current.RequestedThemeVariant = ThemeVariant.Default;
    }

    public void LightTheme_Click(object? sender, EventArgs args)
    {
        App.Current.RequestedThemeVariant = ThemeVariant.Light;
    }

    public void DarkTheme_Click(object? sender, EventArgs args)
    {
        App.Current.RequestedThemeVariant = ThemeVariant.Dark;
    }
}
```

--------------------------------

### Detect Windows Version and Snap Layouts (C#)

Source: https://context7.com/manfromarce/wpf-titlebar-menu/llms.txt

Provides static methods to determine if the application is running on Windows 11 and if the snap layout feature is enabled. It uses registry access for feature detection and environment checks for OS version.

```csharp
// NativeHelpers.cs
public static class NativeHelpers
{
    public const int WM_NCHITTEST = 0x0084;
    public const int WM_NCLBUTTONDOWN = 0x00A1;
    public const int WM_NCLBUTTONUP = 0x00A2;
    public const int HTMAXBUTTON = 9;

    public static bool IsSnapLayoutEnabled()
    {
        if (!IsWindows11()) return false;

        using RegistryKey? key = Registry.CurrentUser.OpenSubKey(
            @"Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced");
        object? registryValueObject = key?.GetValue("EnableSnapAssistFlyout");

        if (registryValueObject == null) return true;
        return (int)registryValueObject > 0;
    }

    public static bool IsWindows11()
    {
        return Environment.OSVersion.Version.Major == 10 &&
               Environment.OSVersion.Version.Minor == 0 &&
               Environment.OSVersion.Version.Build >= 22000;
    }
}
```

--------------------------------

### WPF Element Positioning Helpers (C#)

Source: https://context7.com/manfromarce/wpf-titlebar-menu/llms.txt

Offers utility methods for WPF applications to calculate the position and bounds of UI elements relative to a window. These are useful for custom window chrome implementations or advanced UI interactions.

```csharp
// WpfHelpers.cs
public static class WpfHelpers
{
    public static Point GetElementLocationRelativeToWindow(FrameworkElement element, Window w)
    {
        return element.TransformToAncestor(w).Transform(new Point(0, 0));
    }

    public static Rect GetElementBoundsRelativeToWindow(FrameworkElement element, Window w)
    {
        return element.TransformToAncestor(w).TransformBounds(new Rect(element.RenderSize));
    }
}
```

--------------------------------

### AvaloniaUI Cross-Platform Window Configuration in XAML

Source: https://context7.com/manfromarce/wpf-titlebar-menu/llms.txt

This XAML code defines the main window for an AvaloniaUI application, showcasing cross-platform window configuration. It uses OnPlatform markup extensions for platform-specific settings like title bar height and decoration hints. It also includes a NativeMenu for global menus on macOS and menu bars on Windows/Linux, along with platform-specific icon visibility.

```xml
<!-- MainWindow.axaml -->
<Window x:Class="AvaloniaApplication1.MainWindow"
        xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:ic="using:FluentIcons.Avalonia"
        Title="AvaloniaApplication1"
        MinWidth="330" MinHeight="300" Padding="6"
        ExtendClientAreaTitleBarHeightHint="{OnPlatform Default=-1, Windows=38}"
        ExtendClientAreaToDecorationsHint="{OnPlatform Default=False, Windows=True}">

    <!-- NativeMenu for macOS global menu and Windows/Linux menu bar -->
    <NativeMenu.Menu>
        <NativeMenu>
            <NativeMenuItem Header="File">
                <NativeMenuItem.Menu>
                    <NativeMenu>
                        <NativeMenuItem Gesture="{OnPlatform Ctrl+N, macOS=Cmd+N}" Header="New" />
                        <NativeMenuItem Gesture="{OnPlatform Ctrl+O, macOS=Cmd+O}" Header="Open" />
                        <NativeMenuItemSeparator />
                        <NativeMenuItem Gesture="{OnPlatform Ctrl+S, macOS=Cmd+S}" Header="Save" />
                        <NativeMenuItem Click="QuitMenuItem_Click"
                                        Gesture="{OnPlatform Alt+F4, macOS=Cmd+Q}"
                                        Header="{OnPlatform Exit, macOS='Quit AvaloniaApp'}" />
                    </NativeMenu>
                </NativeMenuItem.Menu>
            </NativeMenuItem>
            <NativeMenuItem Header="View">
                <NativeMenuItem.Menu>
                    <NativeMenu>
                        <NativeMenuItem Click="FullScreen_Click" Gesture="F11" Header="Full Screen" />
                        <NativeMenuItemSeparator />
                        <NativeMenuItem Click="SystemTheme_Click" Header="System theme" ToggleType="Radio" />
                        <NativeMenuItem Click="LightTheme_Click" Header="Light theme" ToggleType="Radio" />
                        <NativeMenuItem Click="DarkTheme_Click" Header="Dark theme" ToggleType="Radio" />
                    </NativeMenu>
                </NativeMenuItem.Menu>
            </NativeMenuItem>
        </NativeMenu>
    </NativeMenu.Menu>

    <Grid RowDefinitions="Auto,*,Auto">
        <Grid x:Name="titleBar" Grid.Row="0" HorizontalAlignment="Left">
            <!-- Platform-specific icon visibility -->
            <Image x:Name="icon" Width="24" Height="24"
                   IsVisible="{OnPlatform Default=False, Windows=True}"
                   Source="avares://AvaloniaApplication1/Assets/avalonia-logo.ico" />

            <!-- NativeMenuBar renders as menu on Windows/Linux, uses global menu on macOS -->
            <NativeMenuBar VerticalAlignment="Center" />

            <!-- Custom toolbar buttons -->
            <Button Background="Transparent" ToolTip.Tip="Save (Ctrl + S)">
                <ic:SymbolIcon Symbol="Save" />
            </Button>
        </Grid>

        <Border Grid.Row="1" Background="DarkGray">
            <TextBlock Text="The content will be here." />
        </Border>

        <Grid x:Name="statusBar" Grid.Row="2">
            <TextBlock Text="Status bar" />
        </Grid>
    </Grid>
</Window>
```

--------------------------------

### Manage Title Bar and Theme in WPF

Source: https://context7.com/manfromarce/wpf-titlebar-menu/llms.txt

Enables custom title bar appearance and theme switching (System, Light, Dark) in a WPF application. It requires Microsoft.UI.Xaml for advanced window customization and handles button colors based on the selected theme. It also includes menu item clicks for creating new windows, exiting the application, and toggling the status bar.

```csharp
// MainWindow.xaml.cs
using Microsoft.UI;
using Microsoft.UI.Windowing;
using Microsoft.UI.Xaml;

public sealed partial class MainWindow : Window
{
    public MainWindow()
    {
        this.InitializeComponent();
        this.ExtendsContentIntoTitleBar = true;  // Enable custom title bar
    }

    private void rootGrid_Loaded(object sender, RoutedEventArgs e)
    {
        if (AppWindowTitleBar.IsCustomizationSupported())
        {
            var titleBar = this.AppWindow.TitleBar;
            titleBar.PreferredHeightOption = TitleBarHeightOption.Tall;
            UpdateTitleBarButtonsColor(((FrameworkElement)sender).ActualTheme);
        }
    }

    private void SystemThemeMenuItem_Click(object sender, RoutedEventArgs e)
    {
        if (this.Content is FrameworkElement rootElement)
        {
            rootElement.RequestedTheme = ElementTheme.Default;
            UpdateTitleBarButtonsColor(rootElement.ActualTheme);
        }
    }

    private void LightThemeMenuItem_Click(object sender, RoutedEventArgs e)
    {
        if (this.Content is FrameworkElement rootElement)
        {
            rootElement.RequestedTheme = ElementTheme.Light;
            UpdateTitleBarButtonsColor(rootElement.ActualTheme);
        }
    }

    private void DarkThemeMenuItem_Click(object sender, RoutedEventArgs e)
    {
        if (this.Content is FrameworkElement rootElement)
        {
            rootElement.RequestedTheme = ElementTheme.Dark;
            UpdateTitleBarButtonsColor(rootElement.ActualTheme);
        }
    }

    // Required: Update caption button colors when theme changes
    public void UpdateTitleBarButtonsColor(ElementTheme actualTheme)
    {
        if (AppWindowTitleBar.IsCustomizationSupported())
        {
            var titleBar = this.AppWindow.TitleBar;
            titleBar.ButtonForegroundColor = actualTheme == ElementTheme.Light
                ? Colors.Black
                : Colors.White;
        }
    }

    private void NewWindowMenuItem_Click(object sender, RoutedEventArgs e)
    {
        var window = new MainWindow();
        window.Activate();
    }

    private void ExitMenuItem_Click(object sender, RoutedEventArgs e)
    {
        this.Close();
    }

    private void StatusBarMenuItem_Click(object sender, RoutedEventArgs e)
    {
        statusBar.Visibility = (sender as ToggleMenuFlyoutItem)?.IsChecked == true
            ? Visibility.Visible
            : Visibility.Collapsed;
    }
}
```

--------------------------------

### Enable Windows 11 Snap Layouts in WPF

Source: https://context7.com/manfromarce/wpf-titlebar-menu/llms.txt

Enables Windows 11 snap layouts for a WPF window by intercepting Windows messages. Specifically, it checks for the WM_NCHITTEST message and, if the mouse is over the maximize button, returns HTMAXBUTTON to trigger the snap layout functionality. This requires custom helper methods for native operations and element bounds calculation.

```csharp
public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        SourceInitialized += OnSourceInitialized;
    }

    private void OnSourceInitialized(object? sender, EventArgs e)
    {
        var source = (HwndSource)PresentationSource.FromVisual(this);
        source.AddHook(WndProc);
    }

    private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
    {
        switch (msg)
        {
            case NativeHelpers.WM_NCHITTEST:
                if (NativeHelpers.IsSnapLayoutEnabled())
                {
                    var point = PointFromScreen(new Point(lParam.ToInt32() & 0xFFFF, lParam.ToInt32() >> 16));
                    if (WpfHelpers.GetElementBoundsRelativeToWindow(maximizeRestoreButton, this).Contains(point))
                    {
                        handled = true;
                        // Apply hover style and return HTMAXBUTTON to enable snap layout
                        maximizeRestoreButton.Background = (Brush)App.Current.Resources["TitleBarButtonHoverBackground"];
                        maximizeRestoreButton.Foreground = (Brush)App.Current.Resources["TitleBarButtonHoverForeground"];
                        return new IntPtr(NativeHelpers.HTMAXBUTTON);
                    }
                    else
                    {
                        // Reset to default style
                        maximizeRestoreButton.Background = (Brush)App.Current.Resources["TitleBarButtonBackground"];
                        maximizeRestoreButton.Foreground = (Brush)App.Current.Resources["TitleBarButtonForeground"];
                    }
                }
                break;
        }
        return IntPtr.Zero;
    }
}
```

--------------------------------

### Configure Extended Title Bar and Menu in WPF (XAML)

Source: https://context7.com/manfromarce/wpf-titlebar-menu/llms.txt

This XAML snippet demonstrates how to configure an extended title bar in a WPF window using WinUI 3 and integrate a custom menu bar. It includes definitions for menu items, keyboard accelerators, and a drag region for title bar interaction. Dependencies include CommunityToolkit.WinUI.Controls.

```xml
<!-- MainWindow.xaml -->
<Window x:Class="WinUiApp1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:controls="using:CommunityToolkit.WinUI.Controls">

    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" Loaded="rootGrid_Loaded">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="*" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>

        <Grid Grid.Row="0" Margin="0,4,0,0" HorizontalAlignment="Left">
            <Image Width="24" Height="24" Source="Assets/icon.png" />

            <controls:DockPanel>
                <MenuBar HorizontalAlignment="Left" VerticalAlignment="Center">
                    <!-- Custom template with WrapPanel for wrapping menu items -->
                    <MenuBar.Template>
                        <ControlTemplate>
                            <Grid x:Name="LayoutRoot">
                                <ItemsControl x:Name="ContentRoot">
                                    <ItemsControl.ItemsPanel>
                                        <ItemsPanelTemplate>
                                            <controls:WrapPanel Orientation="Horizontal" />
                                        </ItemsPanelTemplate>
                                    </ItemsControl.ItemsPanel>
                                </ItemsControl>
                            </Grid>
                        </ControlTemplate>
                    </MenuBar.Template>

                    <MenuBarItem Title="File">
                        <MenuFlyoutItem Text="New">
                            <MenuFlyoutItem.KeyboardAccelerators>
                                <KeyboardAccelerator Key="N" Modifiers="Control" />
                            </MenuFlyoutItem.KeyboardAccelerators>
                        </MenuFlyoutItem>
                        <MenuFlyoutItem Text="Open...">
                            <MenuFlyoutItem.KeyboardAccelerators>
                                <KeyboardAccelerator Key="O" Modifiers="Control" />
                            </MenuFlyoutItem.KeyboardAccelerators>
                        </MenuFlyoutItem>
                        <MenuFlyoutSeparator />
                        <MenuFlyoutItem Click="ExitMenuItem_Click" Text="Exit"
                                        KeyboardAcceleratorTextOverride="Alt+F4" />
                    </MenuBarItem>

                    <MenuBarItem Title="View">
                        <RadioMenuFlyoutItem Click="SystemThemeMenuItem_Click"
                                             GroupName="ThemeGroup" IsChecked="True" Text="System theme" />
                        <RadioMenuFlyoutItem Click="LightThemeMenuItem_Click"
                                             GroupName="ThemeGroup" Text="Light theme" />
                        <RadioMenuFlyoutItem Click="DarkThemeMenuItem_Click"
                                             GroupName="ThemeGroup" Text="Dark theme" />
                        <MenuFlyoutSeparator />
                        <ToggleMenuFlyoutItem Click="StatusBarMenuItem_Click"
                                              IsChecked="True" Text="Status bar" />
                    </MenuBarItem>
                </MenuBar>
            </controls:DockPanel>

            <Button Background="Transparent" ToolTipService.ToolTip="Save (Ctrl + S)">
                <SymbolIcon Symbol="Save" />
            </Button>

            <!-- Drag region for title bar -->
            <Grid x:Name="dragRegion" MinWidth="188" />
        </Grid>

        <Border Grid.Row="1" Background="DarkGray">
            <TextBlock Text="The window content will be here." />
        </Border>

        <Grid x:Name="statusBar" Grid.Row="2">
            <TextBlock Text="Status bar" />
        </Grid>
    </Grid>
</Window>
```

--------------------------------

### WPF Window State Converters in C#

Source: https://context7.com/manfromarce/wpf-titlebar-menu/llms.txt

These C# classes implement IValueConverter and IMultiValueConverter for WPF applications. WindowStateToPathConverter changes maximize/restore button icons based on window state. CaptionHeightConverter calculates dynamic caption height by summing two double values. They are essential for customizing window appearance and behavior.

```csharp
// WindowStateToPathConverter.cs
public class WindowStateToPathConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        var ws = (WindowState)value;
        if (ws == WindowState.Normal)
        {
            // Maximize icon (single square)
            return Geometry.Parse("M 13.5,10.5 H 22.5 V 19.5 H 13.5 Z");
        }
        else
        {
            // Restore icon (overlapping squares)
            return Geometry.Parse("M 13.5,12.5 H 20.5 V 19.5 H 13.5 Z M 15.5,12.5 V 10.5 H 22.5 V 17.5 H 20.5");
        }
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return null;
    }
}

// CaptionHeightConverter.cs - Calculate dynamic caption height
public class CaptionHeightConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        return (double)values[0] + (double)values[1];
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        return null;
    }
}
```

--------------------------------

### Override Menu Style for Wrapping Items in WPF

Source: https://context7.com/manfromarce/wpf-titlebar-menu/llms.txt

XAML code to override the default Fluent theme Menu style in WPF. This allows menu items to wrap within a WrapPanel, ensuring better layout for menus with many items. The Height property is set to NaN to facilitate the WrapPanel's functionality.

```xml
<!-- Inside Window.Styles -->
<Window.Styles>
    <Style Selector="Menu">
        <Setter Property="Background" Value="Transparent" />
        <Setter Property="Height" Value="NaN" /> <!-- Required for WrapPanel to work -->
        <Setter Property="Template">
            <ControlTemplate>
                <Border Padding="{TemplateBinding Padding}"
                        Background="{TemplateBinding Background}">
                    <ItemsPresenter Name="PART_ItemsPresenter">
                        <ItemsPresenter.ItemsPanel>
                            <ItemsPanelTemplate>
                                <WrapPanel />
                            </ItemsPanelTemplate>
                        </ItemsPresenter.ItemsPanel>
                    </ItemsPresenter>
                </Border>
            </ControlTemplate>
        </Setter>
    </Style>
</Window.Styles>
```

--------------------------------

### WPF Title Bar Button Styling (XAML)

Source: https://context7.com/manfromarce/wpf-titlebar-menu/llms.txt

Defines reusable styles for title bar buttons within a WPF application's App.xaml. It includes styles for normal, hover, and pressed states, and custom colors for close buttons.

```xml
<!-- App.xaml -->
<Application.Resources>
    <SolidColorBrush x:Key="TitleBarBackground" Color="#F3F3F3" />
    <sys:Double x:Key="TitleBarHeight">30</sys:Double>
    <sys:Double x:Key="TitleBarButtonWidth">36</sys:Double>
    <sys:Double x:Key="TitleBarButtonHeight">30</sys:Double>

    <SolidColorBrush x:Key="TitleBarButtonBackground" Color="Transparent" />
    <SolidColorBrush x:Key="TitleBarButtonForeground" Color="Black" />
    <SolidColorBrush x:Key="TitleBarButtonHoverBackground" Color="#E9E9E9" />
    <SolidColorBrush x:Key="TitleBarButtonHoverForeground" Color="Black" />

    <SolidColorBrush x:Key="TitleBarCloseButtonHoverBackground" Color="#C42B1C" />
    <SolidColorBrush x:Key="TitleBarCloseButtonHoverForeground" Color="White" />

    <Style x:Key="TitleBarButtonStyle" TargetType="Button">
        <Setter Property="Background" Value="{StaticResource TitleBarButtonBackground}" />
        <Setter Property="Foreground" Value="{StaticResource TitleBarButtonForeground}" />
        <Setter Property="WindowChrome.IsHitTestVisibleInChrome" Value="True" />
        <Setter Property="Width" Value="{StaticResource TitleBarButtonWidth}" />
        <Setter Property="Height" Value="{StaticResource TitleBarButtonHeight}" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Button}">
                    <Border x:Name="border" Background="{TemplateBinding Background}" BorderThickness="0">
                        <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" />
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsMouseOver" Value="true">
                            <Setter TargetName="border" Property="Background"
                                    Value="{StaticResource TitleBarButtonHoverBackground}" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</Application.Resources>
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.