WPF WindowChrome: Edges of maximized Window are out of the screen

Question

I use WindowChrome to customize a Window. When I maximize the Window, then the edges are out of the screen. I use the following code to fix this:

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

    <WindowChrome.WindowChrome>
        <WindowChrome CaptionHeight="50" CornerRadius="0" GlassFrameThickness="0" NonClientFrameEdges="None" ResizeBorderThickness="5" UseAeroCaptionButtons="False" />
    </WindowChrome.WindowChrome>

    <Grid>  
        <Grid.Style>
            <Style TargetType="{x:Type Grid}">
                <Setter Property="Margin" Value="0" />
                <Style.Triggers>
                    <DataTrigger Binding="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}, Path=WindowState}" Value="Maximized">
                        <Setter Property="Margin" Value="{x:Static SystemParameters.WindowResizeBorderThickness}" />
                    </DataTrigger>
                </Style.Triggers>
            </Style>
        </Grid.Style>
        <Border BorderThickness="2" BorderBrush="Blue" Background="Yellow" />
    </Grid>

</Window>

My problem: How can I get the correct number of pixels, so that the edges are not out of the screen.

SystemParameters.WindowResizeBorderThickness contains not the correct value.

Answer 1

The WindowChrome will basically overlap by the size of ResizeBorderThickness when maximized.

If you want your Window completely visible while maximized just use the WindowChrome ResizeBorderThickness (5px) as Margin in your Grid style:

<Setter Property="Margin" Value="5" />

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Otherwise if you want your Border's BorderThickness not to be visible while the window is maximized, you should use your Border's BorderThickness (2px) as Margin in addition to the WindowChrome ResizeBorderThickness (5px) in your Grid style. Then the Margin would be 7px.