BorderGapMaskConverter Class
Represents a converter that converts the dimensions of a GroupBox control into a VisualBrush.
Assembly: PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation
The VisualBrush created by this converter applies an OpacityMask to the Border of the GroupBox so that it does not appear in the area defined for the Header of the GroupBox.
This example shows how to create a template for a GroupBox control.
The following example defines a GroupBox control template by using a Grid control for layout. The template uses a BorderGapMaskConverter to define the border of the GroupBox so that the border does not obscure the Header content.
<!--================================================================= GroupBox Template Example ==================================================================--> <BorderGapMaskConverter x:Key="BorderGapMaskConverter"/> <Style x:Key="{x:Type GroupBox}" TargetType="{x:Type GroupBox}"> <Setter Property="BorderBrush" Value="Gray"/> <Setter Property="Foreground" Value="White"/> <Setter Property="BorderThickness" Value="1"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type GroupBox}"> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="4"/> <ColumnDefinition Width="Auto"/> <ColumnDefinition Width="*"/> <ColumnDefinition Width="4"/> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition Height="Auto"/> <RowDefinition Height="Auto"/> <RowDefinition Height="*"/> <RowDefinition Height="4"/> </Grid.RowDefinitions> <Border CornerRadius="4" Grid.Row="1" Grid.RowSpan="3" Grid.Column="0" Grid.ColumnSpan="4" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="Transparent" Background="{TemplateBinding Background}"/> <!-- ContentPresenter for the header --> <Border x:Name="Header" Padding="6,0,6,0" Grid.Row="0" Grid.RowSpan="2" Grid.Column="1"> <ContentPresenter ContentSource="Header" RecognizesAccessKey="True" /> </Border> <!-- Primary content for GroupBox --> <ContentPresenter Grid.Row="2" Grid.Column="1" Grid.ColumnSpan="2" Margin="{TemplateBinding Padding}"/> <Border CornerRadius="0" Grid.Row="1" Grid.RowSpan="3" Grid.ColumnSpan="4" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}"> <Border.OpacityMask> <MultiBinding Converter= "{StaticResource BorderGapMaskConverter}" ConverterParameter="6"> <Binding ElementName="Header" Path="ActualWidth"/> <Binding RelativeSource="{RelativeSource Self}" Path="ActualWidth"/> <Binding RelativeSource="{RelativeSource Self}" Path="ActualHeight"/> </MultiBinding> </Border.OpacityMask> </Border> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style>
Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.