Поделиться через

  • Статья

ScrollViewer Styles and Templates

Microsoft Silverlight will reach end of support after October 2021. Learn more.

This topic describes the styles and templates for the ScrollViewer control. You can modify the default ControlTemplate to give the control a unique appearance. For more information, see Customizing the Appearance of an Existing Control by Using a ControlTemplate.

ScrollViewer Parts

The following table lists the named parts for the ScrollViewer control.

Part

Type

Description

ScrollContentPresenter

ScrollContentPresenter

The placeholder for content in the ScrollViewer.

HorizontalScrollBar

ScrollBar

The ScrollBar used to scroll the content horizontally.

VerticalScrollBar

ScrollBar

The ScrollBar used to scroll the content vertically.

ScrollViewer States

The ScrollViewer control does not have any named states.

Default Style and Template

The following shows the XML namespace mapping that you have to specify when you work with styles and templates.

<!-- XML Namespace mapping. -->
xmlns:vsm="clr-namespace:System.Windows;assembly=System.Windows"
NoteNote:

The default templates still specify the vsm: XML namespace mapping for the VisualStateManager element for legacy reasons. You can however, use the VisualStateManager element without specifying the vsm: mapping.

The following XAML shows the default style and template for the ScrollViewer control.

<Style TargetType="ScrollViewer">
      <Setter Property="HorizontalContentAlignment" Value="Left" />
      <Setter Property="VerticalContentAlignment" Value="Top" />
      <Setter Property="VerticalScrollBarVisibility" Value="Visible" />
      <Setter Property="Padding" Value="4"/>
      <Setter Property="BorderThickness" Value="1"/>
      <Setter Property="BorderBrush">
          <Setter.Value>
              <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                  <GradientStop Color="#FFA3AEB9" Offset="0"/>
                  <GradientStop Color="#FF8399A9" Offset="0.375"/>
                  <GradientStop Color="#FF718597" Offset="0.375"/>
                  <GradientStop Color="#FF617584" Offset="1"/>
              </LinearGradientBrush>
          </Setter.Value>
      </Setter>
      <Setter Property="Template">
          <Setter.Value>
              <ControlTemplate TargetType="ScrollViewer">
                  <Border CornerRadius="2" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
                      <Grid Background="{TemplateBinding Background}">
                          <Grid.RowDefinitions>
                              <RowDefinition Height="*"/>
                              <RowDefinition Height="Auto"/>
                          </Grid.RowDefinitions>
                          <Grid.ColumnDefinitions>
                              <ColumnDefinition Width="*"/>
                              <ColumnDefinition Width="Auto"/>
                          </Grid.ColumnDefinitions>

                          <ScrollContentPresenter x:Name="ScrollContentPresenter"
                                                  Cursor="{TemplateBinding Cursor}"
                                                  Margin="{TemplateBinding Padding}"
                                                  ContentTemplate="{TemplateBinding ContentTemplate}"/>

                          <Rectangle Grid.Column="1" Grid.Row="1" Fill="#FFE9EEF4"/>

                          <ScrollBar x:Name="VerticalScrollBar" Width="18"
                                     IsTabStop="False"
                                     Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}"
                                     Grid.Column="1" Grid.Row="0" Orientation="Vertical"
                                     ViewportSize="{TemplateBinding ViewportHeight}"
                                     Maximum="{TemplateBinding ScrollableHeight}"
                                     Minimum="0"
                                     Value="{TemplateBinding VerticalOffset}"
                                     Margin="0,-1,-1,-1"/>

                          <ScrollBar x:Name="HorizontalScrollBar" Height="18"
                                     IsTabStop="False"
                                     Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}"
                                     Grid.Column="0" Grid.Row="1" Orientation="Horizontal"
                                     ViewportSize="{TemplateBinding ViewportWidth}"
                                     Maximum="{TemplateBinding ScrollableWidth}"
                                     Minimum="0"
                                     Value="{TemplateBinding HorizontalOffset}"
                                     Margin="-1,0,-1,-1"/>

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