How to: Create a Custom ScrollBarTemplate

Article
2012-11-16
This example shows how to define a custom ScrollBar template.
Example

The following example shows how to define a custom ScrollBar template.
<!-- GRADIENTS -->
<LinearGradientBrush x:Key="ButtonGradient" 
                     StartPoint="0,0" EndPoint="0,1">
  <LinearGradientBrush.GradientStops>
    <GradientStop Color="#FDB6CADF" Offset="0" />
    <GradientStop Color="#FCC3C5FF" Offset="0.1" />
    <GradientStop Color="#FCC4D0EF" Offset="0.3" />
    <GradientStop Color="#FDB7C2DF" Offset="0.6" />
    <GradientStop Color="#FE95B3CF" Offset="0.8" />
    <GradientStop Color="#FE96AACF" Offset="1" />
  </LinearGradientBrush.GradientStops>
</LinearGradientBrush>

<LinearGradientBrush x:Key="VerticalScrollGradient" 
                     StartPoint="0,0" EndPoint="1,0">
  <LinearGradientBrush.GradientStops>
    <GradientStop Color="#FDB6CADF" Offset="0" />
    <GradientStop Color="#FCC3C5FF" Offset="0.1" />
    <GradientStop Color="#FCC4D0EF" Offset="0.3" />
    <GradientStop Color="#FDB7C2DF" Offset="0.6" />
    <GradientStop Color="#FE95B3CF" Offset="0.8" />
    <GradientStop Color="#FE96AACF" Offset="1" />
  </LinearGradientBrush.GradientStops>
</LinearGradientBrush>

<!-- SCROLLBAR TEMPLATES -->
<Style x:Key="Scrollbar_LineButton" TargetType="{x:Type RepeatButton}">
  <Setter Property="OverridesDefaultStyle" Value="true"/>
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="{x:Type RepeatButton}">
        <Border 
          BorderBrush="Transparent" 
          BorderThickness="1" 
          CornerRadius="6" 
          Background="{DynamicResource ButtonGradient}">
          <ContentPresenter x:Name="ContentSite" />
        </Border>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
  <Setter Property="Height" Value="12" />
  <Setter Property="Width" Value="12" />
  <Setter Property="Foreground" Value="Gray" />
  <Setter Property="FontSize" Value="6pt" />
  <Setter Property="FontWeight" Value="Bold" />
  <Setter Property="FontFamily" Value="Lucida Sans" />
  <Setter Property="VerticalAlignment" Value="Center" />
  <Setter Property="HorizontalAlignment" Value="Center" />
</Style>

<Style x:Key="ScrollBar_TrackRepeater"  TargetType="{x:Type RepeatButton}">
  <Setter Property="OverridesDefaultStyle" Value="true"/>
  <Setter Property="IsTabStop" Value="false" />
  <Setter Property="Focusable" Value="false" />
  <Setter Property="Command" Value="ScrollBar.PageUpCommand" />
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="{x:Type RepeatButton}">
        <Rectangle Fill="Transparent" />
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</Style>

<Style x:Key="ScrollBar_UpTrack" 
       BasedOn="{StaticResource ScrollBar_TrackRepeater}" 
       TargetType="{x:Type RepeatButton}">
  <Setter Property="Command" Value="ScrollBar.PageUpCommand" />
</Style>
<Style x:Key="ScrollBar_DownTrack" 
       BasedOn="{StaticResource ScrollBar_TrackRepeater}" 
       TargetType="{x:Type RepeatButton}">
  <Setter Property="Command" Value="ScrollBar.PageDownCommand" />
</Style>


<Style x:Key="ScrollBar_LeftTrack" 
       BasedOn="{StaticResource ScrollBar_TrackRepeater}" 
       TargetType="{x:Type RepeatButton}">
  <Setter Property="Command" Value="ScrollBar.PageLeftCommand" />
</Style>

<Style x:Key="ScrollBar_RightTrack" 
       BasedOn="{StaticResource ScrollBar_TrackRepeater}" 
       TargetType="{x:Type RepeatButton}">
  <Setter Property="Command" Value="ScrollBar.PageRightCommand" />
</Style>

<Style x:Key="ScrollBar_VerticalThumb" TargetType="{x:Type Thumb}">
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="{x:Type Thumb}">
        <Border CornerRadius="6" 
          BorderBrush="Transparent"     
          BorderThickness="0" 
          Background="{DynamicResource VerticalScrollGradient}" />
      </ControlTemplate>
    </Setter.Value>
  </Setter>
  <Setter Property="MinHeight" Value="10" />
  <Setter Property="MinWidth" Value="10" />
</Style>


<Style x:Key="ScrollBar_HorizontalThumb" TargetType="{x:Type Thumb}">
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="{x:Type Thumb}">
        <Border CornerRadius="6" 
          BorderBrush="Transparent"     
          BorderThickness="0" 
          Background="{DynamicResource ButtonGradient}" />
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</Style>

<Style TargetType="{x:Type ScrollBar}">
  <Setter Property="Background" Value="Transparent" />
  <Setter Property="MinWidth" Value="10" />
  <!--Define a default vertical ScrollBar template with 
      2 RepeatButtons and Track-->
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="{x:Type ScrollBar}">
        <Grid>
          <Grid.ColumnDefinitions>
            <ColumnDefinition Width="12"/>
          </Grid.ColumnDefinitions>
          <Grid.RowDefinitions>
            <RowDefinition Height="12" />
            <RowDefinition Height="*"/>
            <RowDefinition Height="12" />
          </Grid.RowDefinitions>
          <Border Grid.Row="1" BorderThickness="0" 
                  Background="Transparent" CornerRadius="4"/>
          <RepeatButton Grid.Row="0" 
                        Style="{DynamicResource Scrollbar_LineButton}" 
                        Command="ScrollBar.LineUpCommand" Content=" ^" />

          <!--IsDirectionReversed set to true draws a ScrollBar with a 
              Track whose lowest value is at the bottom.
              The default orientation of a ScrollBar is for the Track
              values to decrease from top to bottom.-->
          <Track Grid.Row="1" Name="PART_Track"
                 IsDirectionReversed="true">
            <Track.DecreaseRepeatButton>
              <RepeatButton Style="{DynamicResource ScrollBar_UpTrack}"/>
            </Track.DecreaseRepeatButton>
            <Track.Thumb>
              <Thumb Style="{DynamicResource ScrollBar_HorizontalThumb}"/>
            </Track.Thumb>
            <Track.IncreaseRepeatButton>
              <RepeatButton Style="{DynamicResource ScrollBar_DownTrack}"/>
            </Track.IncreaseRepeatButton>
          </Track>
          <RepeatButton Grid.Row="2" 
                        Style="{DynamicResource Scrollbar_LineButton}" 
                        Command="ScrollBar.LineDownCommand" Content=" v" />
        </Grid>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
  <Style.Triggers>
    <Trigger Property="Orientation" Value="Horizontal" >
      <Setter Property="Background" Value="Transparent" />
      <Setter Property="MinHeight" Value="10" />
      <Setter Property="Template">
        <Setter.Value>
          <ControlTemplate TargetType="{x:Type ScrollBar}">
            <Grid>
              <Grid.RowDefinitions>
                <RowDefinition Height="12"/>
              </Grid.RowDefinitions>
              <Grid.ColumnDefinitions>
                <ColumnDefinition Width="12" />
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="12" />
              </Grid.ColumnDefinitions>
              <Border Grid.Column="1" BorderThickness="0" 
                    Background="Transparent" CornerRadius="4"/>
              <RepeatButton Grid.Column="0" 
                            Style="{DynamicResource Scrollbar_LineButton}"                                  
                            Command="ScrollBar.LineLeftCommand" Content=" &lt;" />
              <Track Grid.Column="1" Name="PART_Track">
                <Track.DecreaseRepeatButton>
                  <RepeatButton Style="{DynamicResource ScrollBar_LeftTrack}"/>
                </Track.DecreaseRepeatButton>
                <Track.Thumb>
                  <Thumb Style="{DynamicResource ScrollBar_HorizontalThumb}"/>
                </Track.Thumb>
                <Track.IncreaseRepeatButton>
                  <RepeatButton Style="{DynamicResource ScrollBar_RightTrack}"/>
                </Track.IncreaseRepeatButton>
              </Track>
              <RepeatButton Grid.Column="2" 
                            Style="{DynamicResource Scrollbar_LineButton}"                                  
                            Command="ScrollBar.LineRightCommand" Content=" &gt;" />
            </Grid>
          </ControlTemplate>
        </Setter.Value>
      </Setter>
    </Trigger>
  </Style.Triggers>
</Style>

<!-- BUTTON TEMPLATE -->
<Style TargetType="{x:Type Button}">
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="{x:Type Button}">
        <Border x:Name="OuterBorder"
          CornerRadius="3" 
          Background="{DynamicResource ButtonGradient}">
          <Border
            x:Name="InnerBorder"
            CornerRadius="3"
            Background="VerticalGradient Transparent #33000000"
            Padding="{TemplateBinding Padding}">
            <ContentPresenter x:Name="ContentSite" 
            HorizontalAlignment="Center" 
            VerticalAlignment="Center" />
          </Border>
        </Border>
        <ControlTemplate.Triggers>
          <Trigger Property="IsPressed" Value="true">
            <Setter TargetName="InnerBorder" Property="Background" 
                    Value="VerticalGradient #10000000 #20000000" />
          </Trigger>
          <Trigger Property="IsEnabled" Value="false">
            <Setter TargetName="InnerBorder" Property="Background" 
                    Value="VerticalGradient #50302A90 #40201040"  />
            <Setter Property="BorderBrush" Value="Silver"  />
            <Setter Property="Foreground" Value="SlateGray"  />
          </Trigger>
        </ControlTemplate.Triggers>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
  <Setter Property="Height" Value="18" />
  <Setter Property="Foreground" Value="MidnightBlue" />
</Style>
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How to: Create a Custom ScrollBarTemplate

Example

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