ScrollViewer.ScrollChanged Event
.NET Framework 4.5
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Occurs when changes are detected to the scroll position, extent, or viewport size.
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
This example shows how to handle the ScrollChanged event of a ScrollViewer.
A FlowDocument element with Paragraph parts is defined in XAML. When the ScrollChanged event occurs due to user interaction, a handler is invoked, and text is written to a TextBlock indicating that the event has occurred.
<ScrollViewer Name="sv1" CanContentScroll="False" ScrollChanged="sChanged"> <FlowDocument FontFamily="Arial" PageWidth="400"> <Paragraph> Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure. Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure. Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure. </Paragraph> ... <Paragraph> Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure. Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure. Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure. </Paragraph> </FlowDocument> </ScrollViewer>
private void sChanged(object sender, ScrollChangedEventArgs e) { if (sv1.CanContentScroll == true) { tBlock1.Foreground = System.Windows.Media.Brushes.Red; tBlock1.Text = "ScrollChangedEvent just Occurred"; tBlock2.Text = "ExtentHeight is now " + e.ExtentHeight.ToString(); tBlock3.Text = "ExtentWidth is now " + e.ExtentWidth.ToString(); tBlock4.Text = "ExtentHeightChange was " + e.ExtentHeightChange.ToString(); tBlock5.Text = "ExtentWidthChange was " + e.ExtentWidthChange.ToString(); tBlock6.Text = "HorizontalOffset is now " + e.HorizontalOffset.ToString(); tBlock7.Text = "VerticalOffset is now " + e.VerticalOffset.ToString(); tBlock8.Text = "HorizontalChange was " + e.HorizontalChange.ToString(); tBlock9.Text = "VerticalChange was " + e.VerticalChange.ToString(); tBlock10.Text = "ViewportHeight is now " + e.ViewportHeight.ToString(); tBlock11.Text = "ViewportWidth is now " + e.ViewportWidth.ToString(); tBlock12.Text = "ViewportHeightChange was " + e.ViewportHeightChange.ToString(); tBlock13.Text = "ViewportWidthChange was " + e.ViewportWidthChange.ToString(); } else { tBlock1.Text = ""; }
Windows 8 Consumer Preview, Windows Server 8 Beta, Windows 7, Windows Server 2008 SP2, 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.
