Практическое руководство. Обработка события ScrollChanged
Пример
В этом примере демонстрируется обработка ScrollChanged событие ScrollViewer.
Объект FlowDocument элемент с Paragraph определить компоненты в XAML. Когда ScrollChanged событие возникает из-за взаимодействия с пользователем, вызывается обработчик и текст записывается TextBlock означает, что возникло событие.
<ScrollViewer Name="svrContent" 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 (svrContent.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 = "";
}