The IScrollInfo interface exposes access to methods that enable logical scrolling of child content as well as computing which child elements are visible. In addition, it defines properties used to define the scrollable region.

Logical scrolling enables scrolling to the next element in the logical tree. Physical scrolling, in contrast, scrolls content by a defined measurable increment in a specified direction. If you require physical scrolling instead of logical scrolling, wrap the host Panel element in a ScrollViewer and set the value of its CanContentScroll property to false.

This example shows how to scroll content by using the IScrollInfo interface.

The following example demonstrates the features of the IScrollInfo interface. The example creates a StackPanel element in Extensible Application Markup Language (XAML) that is nested in a parent ScrollViewer. The child elements of the StackPanel can be scrolled logically by using the methods defined by the IScrollInfo interface and cast to the instance of StackPanel (sp1) in code.

<Border BorderBrush="Black" Background="White" BorderThickness="2" Width="500" Height="500">
    <ScrollViewer Name="sv1" CanContentScroll="True" VerticalScrollBarVisibility="Visible" HorizontalScrollBarVisibility="Visible">
        <StackPanel Name="sp1">
            <Button>Button 1</Button>
            <Button>Button 2</Button>
            <Button>Button 3</Button>
            <Button>Button 4</Button>
            <Button>Button 5</Button>
            <Rectangle Width="700" Height="500" Fill="Purple"/>
            <TextBlock>Rectangle 1</TextBlock>
            <Rectangle Width="700" Height="500" Fill="Red"/>
            <TextBlock>Rectangle 2</TextBlock>
            <Rectangle Width="700" Height="500" Fill="Green"/>
            <TextBlock>Rectangle 3</TextBlock>
        </StackPanel> 
    </ScrollViewer>
</Border>

Each Button in the XAML file triggers an associated custom method that controls scrolling behavior in StackPanel. The following example shows how to use the LineUp and LineDown methods; it also generically shows how to use all the positioning methods that the IScrollInfo class defines.

Private Sub spLineUp(ByVal sender As Object, ByVal args As RoutedEventArgs)

    CType(sp1, IScrollInfo).LineUp()
End Sub
Private Sub spLineDown(ByVal sender As Object, ByVal args As RoutedEventArgs)

    CType(sp1, IScrollInfo).LineDown()
End Sub

private void spLineUp(object sender, RoutedEventArgs e)
{
    ((IScrollInfo)sp1).LineUp();
}
private void spLineDown(object sender, RoutedEventArgs e)
{
    ((IScrollInfo)sp1).LineDown();
}

For the complete sample, see IScrollInfo Methods Sample.

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

.NET Framework

Reference

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