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C # | WPF - custom title bar - drag the window at the top when the maximum value is not working

I have a custom title bar and window style is not set. When I click on the title bar, I check if it is a double click (which does maximize and restore the window) if it has not double-clicked. I do Window.DragMove. This is great for snapping to the side and top. But when I try to drag a window when it is maximized (which usually restores the window down), it does nothing. Here is my code:

    static Window Window { get { return Application.Current.MainWindow; } }

    /// <summary>
    /// TitleBar_MouseDown - Drag if single-click, resize if double-click
    /// </summary>
    private static void TitleBar_MouseDown(object sender, MouseButtonEventArgs e)
    {
        if (e.ChangedButton == MouseButton.Left)
        {
            if (e.ClickCount == 2)
            {
                AdjustWindowSize();
            }
            else
            {
                Window.DragMove();//Here is where I do the drag move
            }
        }
    }

    /// <summary>
    /// Adjusts the WindowSize to correct parameters when Maximize button is clicked
    /// </summary>
    internal static void AdjustWindowSize()
    {
        if (Window.WindowState == WindowState.Maximized)
        {
            SystemCommands.RestoreWindow(Window);
        }
        else
        {
            SystemCommands.MaximizeWindow(Window);
        }

    }

    #region Button Events

    /// <summary>
    /// CloseButton_Clicked
    /// </summary>
    public static void Close()
    {
        SystemCommands.CloseWindow(Window);
    }

    /// <summary>
    /// MaximizedButton_Clicked
    /// </summary>
    public static void Maximize()
    {
        AdjustWindowSize();
    }

    /// <summary>
    /// Minimized Button_Clicked
    /// </summary>
    public static void Minimize()
    {
        SystemCommands.MinimizeWindow(Window);
    }

    #endregion

The modern interface and MahApps.Metro does it somehow, and I briefly looked at their source code, but could not find how they do it.

Thanks in advance.

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, aero snap xaml

, , , , .

XAML

<Window x:Class="CSharpWPF.MainWindow" 
            xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
            xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
            Title="MainWindow" >
    <WindowChrome.WindowChrome>
        <WindowChrome CaptionHeight="{Binding ActualHeight,ElementName=titlebar}"/>
    </WindowChrome.WindowChrome>
    <DockPanel LastChildFill="True">
        <Border Background="LightBlue" DockPanel.Dock="Top" Height="25" x:Name="titlebar">
            <TextBlock Text="{Binding Title, RelativeSource={RelativeSource FindAncestor,AncestorType=Window},FallbackValue=Title}" 
                       Margin="10,0,0,0"
                       VerticalAlignment="Center">
                <TextBlock.Effect>
                    <DropShadowEffect Color="White" ShadowDepth="3"/>
                </TextBlock.Effect>
            </TextBlock>
        </Border>
        <Border BorderBrush="LightGray" BorderThickness="1" Padding="4">
            <TextBlock Text="Window content"/>
        </Border>
    </DockPanel>
</Window>

result

- .

,

<Style TargetType="Window" x:Key="CustomTitleBar">
    <Setter Property="WindowChrome.WindowChrome">
        <Setter.Value>
            <WindowChrome CaptionHeight="{x:Static SystemParameters.CaptionHeight}" />
        </Setter.Value>
    </Setter>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="Window">
                <DockPanel LastChildFill="True">
                    <Border Background="LightBlue" DockPanel.Dock="Top" 
                            Height="{x:Static SystemParameters.CaptionHeight}" x:Name="titlebar">
                        <Grid>
                            <TextBlock Text="{TemplateBinding Title}" 
                                        Margin="10,0,0,0"
                                        VerticalAlignment="Center">
                                <TextBlock.Effect>
                                    <DropShadowEffect Color="White" ShadowDepth="3"/>
                                </TextBlock.Effect>
                            </TextBlock>
                        </Grid>
                    </Border>
                    <Border Background="{TemplateBinding Background}" BorderBrush="LightGray" 
                            BorderThickness="1" Padding="4">
                        <ContentPresenter/>
                    </Border>
                </DockPanel>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>


<Window x:Class="CSharpWPF.View" 
                xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                Title="MainWindow" 
                Style="{StaticResource CustomTitleBar}" >
    <TextBlock Text="Window content"/>
</Window>

How to implement in your code

: CustomChrome.cs

41: CaptionHeight = 36, 0.

var chrome = new WindowChrome() { GlassFrameThickness = new Thickness(-1), CaptionHeight = 36 };

60: ((FrameworkElement)sender).MouseDown += TitleBar_MouseDown;

70: ​​ TitleBar_MouseDown

: CornerButtons.xaml

13: WindowChrome.IsHitTestVisibleInChrome="True" StackPanel

    <StackPanel SnapsToDevicePixels="True" Orientation="Horizontal" WindowChrome.IsHitTestVisibleInChrome="True">

: MainWindow.xaml

17: WindowChrome.IsHitTestVisibleInChrome="True" StackPanel

<cc:CornerButtons Grid.Column="2">
    <StackPanel Orientation="Horizontal"
                WindowChrome.IsHitTestVisibleInChrome="True">

,

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