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BorderGapMaskConverter Class

Represents a converter that converts the dimensions of a GroupBox control into a VisualBrush.

System.Object
  System.Windows.Controls.BorderGapMaskConverter

Namespace:  System.Windows.Controls
Assembly:  PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

type BorderGapMaskConverter =  
    class 
        interface IMultiValueConverter 
    end
<BorderGapMaskConverter .../>

The BorderGapMaskConverter type exposes the following members.

  NameDescription
Public methodBorderGapMaskConverterInitializes a new instance of the BorderGapMaskConverter class.
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  NameDescription
Public methodConvertCreates a VisualBrush that draws the border for a GroupBox control.
Public methodConvertBackNot implemented.
Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
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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>

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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