.net 4.0 - Window out of the screen when maximized using WPF shell integration library

Question

I'm using the WPF Shell Integration Library to create a custom chrome of my wpf app. All is good, but when maximizing the app, 6 or 7 pixels are out of the screen.

This is the code I'm using:

<Style TargetType="{x:Type local:MainWindow}">
        <Setter Property="shell:WindowChrome.WindowChrome">
            <Setter.Value>
                <shell:WindowChrome
                    ResizeBorderThickness="6"
                    CaptionHeight="10"
                    CornerRadius="0"
                    GlassFrameThickness="1"/>
            </Setter.Value>
        </Setter>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type local:MainWindow}">
                    <Grid>
                        <Border BorderThickness="1" BorderBrush="#389FD1" Background="#389FD1">
                            <ContentPresenter Margin="0,22,0,0" Content="{TemplateBinding Content}"/>
                        </Border>
                        <StackPanel Orientation="Horizontal" HorizontalAlignment="Right" VerticalAlignment="Top" >
                            <TextBlock Text="{Binding NombreUsuario}" Foreground="White" Margin="5,5,20,5" Opacity=".8" />
                            <Button Style="{StaticResource ImageButton}" Height="20" Width="20" Margin="0" Click="WindowMinimize" shell:WindowChrome.IsHitTestVisibleInChrome="True">
                                <Image Height="10" Width="10" Source="/Resources/Images/minimize.png" />
                            </Button>
                            <Button Style="{StaticResource ImageButton}" Height="20" Width="20" Margin="0" Click="WindowMaximizeRestore" shell:WindowChrome.IsHitTestVisibleInChrome="True" >
                                <Image Height="10" Width="10" Source="/Resources/Images/maximize.png" />
                            </Button>
                            <Button Style="{StaticResource ImageButton}" Height="20" Width="20" Margin="0" Click="WindowClose" shell:WindowChrome.IsHitTestVisibleInChrome="True">
                                <Image Height="10" Width="10" Source="/Resources/Images/close.png" />
                            </Button>
                        </StackPanel>

                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

Answer 1

Windows crops the edges of the window when it's maximized to obscure what would normally be the resize edges. You can get around this by putting a proxy border between the window and your content and then inflate the thickness when it's maximized.

I modified the example that came with the lib to do this, the same basic change could be made to your sample:

<ControlTemplate TargetType="{x:Type local:SelectableChromeWindow}">
  <Border BorderBrush="Green">
    <Border.Style>
      <Style TargetType="{x:Type Border}">
        <Setter Property="BorderThickness" Value="0"/>
        <Style.Triggers>
          <DataTrigger Binding="{Binding ElementName=ThisWindow, Path=WindowState}" Value="Maximized">
            <Setter Property="BorderThickness" Value="{Binding Source={x:Static shell:SystemParameters2.Current}, Path=WindowResizeBorderThickness}"/>
          </DataTrigger>
        </Style.Triggers>
      </Style>
    </Border.Style>
    <Grid [...]/>
  </Border>
</ControlTemplate>

I hope that helps.

For .net 4.5 and above, the SystemParameters are a little different, e.g.:

<DataTrigger Binding="{Binding RelativeSource={RelativeSource AncestorType={x:Type local:MainWindow}}, Path=WindowState}" Value="Maximized">
    <Setter Property="BorderThickness" Value="{Binding Source={x:Static SystemParameters.WindowResizeBorderThickness}}"/>
</DataTrigger>