private void PreviewMouseWheel(object sender, MouseWheelEventArgs e)
{
var scrollViewer = ResHelper.FindVisualChildren <ScrollViewer>(AssociatedObject).FirstOrDefault();
if (scrollViewer == null)
{
return;
}
const float tolerance = 1e-4f;
var scrollPos = scrollViewer.ContentVerticalOffset;
if (
(!(Math.Abs(scrollPos - scrollViewer.ScrollableHeight) < tolerance) || e.Delta >= 0) &&
(!(Math.Abs(scrollPos) < tolerance) || e.Delta <= 0)
)
{
return;
}
if (!(((Control)sender).Parent is UIElement parent))
{
return;
}
e.Handled = true;
var e2 = new MouseWheelEventArgs(e.MouseDevice, e.Timestamp, e.Delta)
{
RoutedEvent = UIElement.MouseWheelEvent,
Source = sender
};
parent.RaiseEvent(e2);
}