(xaml, wpf) ScrollViewer Binding confusion (beginner) (ANSWERED)

[Maximilien]

SEE AND CONTINUE DISCUSSION on the WPF Forum I have a UI with a scrollviewer like this: I want to scroll the viewer to the top when the ItemSource changes.

public partial class MyPage: UserControl
{
public MyPage()
{
InitializeComponent();
}

    private void Containers\_OnTargetUpdated(object? Sender, DataTransferEventArgs E)
    {
        var MyScroller = (ScrollViewer) this.FindName("Scroller");
        MyScroller.ScrollToHome();
    }
}

This works but it's probably not the best way to do it (ie. finding a control by name). Can I pass the ScrollViewer "object" to the TargetUpdated callback/event ? so that I don't have to referencing it by name? It seems clunky. I don't know exactly what magic incantations I need to google for.

CI/CD = Continuous Impediment/Continuous Despair

[Lost User]

You could try the WPF forum.

[Richard Deeming]

The sender parameter should be the ItemsControl, in which case you just need to walk up the visual tree to find the ScrollViewer.

private void Containers_OnTargetUpdated(object? sender, DataTransferEventArgs e)
{
var current = sender as DependencyObject;
var scroller = current as ScrollViewer;
while (scroller == null && current != null)
{
current = VisualTreeHelper.GetParent(current);
scroller = current as ScrollViewer;
}
if (scroller != null)
{
scroller.ScrollToHome();
}
}

---

"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

[Maximilien]

(obviously, I should have seen that forum) thanks.

CI/CD = Continuous Impediment/Continuous Despair

[Maximilien]

Thanks, it works. (sorry if I did not answer before). :rose:

CI/CD = Continuous Impediment/Continuous Despair