UWP ListView Quick Return Footer

Question

I know Windows.Community.Toolkit has a QuickReturn ScrollHeader. But that's for the Header only because the collapsing direction for the footer is different from the header.

How can I make a quick return footer for the ListView? I am looking for some scrolling event that would help me to do this.

Answer 1

You can try to use the ScrollViewer to wrap the ListView to get the scroll event of the ScrollViewer.

xaml

<Grid>
    <ScrollViewer ViewChanged="ScrollViewer_ViewChanged" VerticalAlignment="Stretch">
        <ListView> 
                 ...
        </ListView>
    </ScrollViewer>
</Grid>

xaml.cs

private double scrollLocation = 0;

private void ScrollViewer_ViewChanged(object sender, ScrollViewerViewChangedEventArgs e)
{
    var viewer = sender as ScrollViewer;
    if (viewer.VerticalOffset > scrollLocation + 3)
    {
        // scroll down, show the footer
    }
    else if (viewer.VerticalOffset < scrollLocation - 3)
    {
        // scroll up, hide the footer
    }
    scrollLocation = viewer.VerticalOffset;
}

By listening to the ScrollViewer's ViewChanged event, you can determine the scroll direction, and the reason is +3, -3, mainly to eliminate the unconscious scrolling of the mouse or touch, reduce false positives.

Best regards.